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    SubjectWhat's in linux1394-2.6.git? -- Part II.2/3
    This part of linux1394-2.6.git's current for-linus..for-next combined
    diff adds firewire-net.
    ---
    drivers/firewire/Kconfig | 12 +
    drivers/firewire/Makefile | 4 +
    drivers/firewire/net.c | 1655 ++++++++++++++++++++++++++++++++++++++
    drivers/ieee1394/Kconfig | 2
    4 files changed, 1671 insertions(+), 2 deletions(-)

    Index: b/drivers/firewire/Kconfig
    ===================================================================
    --- a/drivers/firewire/Kconfig
    +++ b/drivers/firewire/Kconfig
    @@ -77,3 +77,15 @@ config FIREWIRE_SBP2

    You should also enable support for disks, CD-ROMs, etc. in the SCSI
    configuration section.
    +
    +config FIREWIRE_NET
    + tristate "IP networking over 1394"
    + depends on FIREWIRE && INET
    + help
    + This enables IPv4 over IEEE 1394, providing IP connectivity with
    + other implementations of RFC 2734 as found on several operating
    + systems. Multicast support is currently limited.
    +
    + To compile this driver as a module, say M here: The module will be
    + called firewire-net. It replaces eth1394 of the classic IEEE 1394
    + stack.
    Index: b/drivers/firewire/Makefile
    ===================================================================
    --- a/drivers/firewire/Makefile
    +++ b/drivers/firewire/Makefile
    @@ -6,7 +6,9 @@ firewire-core-y += core-card.o core-cdev
    core-iso.o core-topology.o core-transaction.o
    firewire-ohci-y += ohci.o
    firewire-sbp2-y += sbp2.o
    +firewire-net-y += net.o

    -obj-$(CONFIG_FIREWIRE) += firewire-core.o
    +obj-$(CONFIG_FIREWIRE) += firewire-core.o
    obj-$(CONFIG_FIREWIRE_OHCI) += firewire-ohci.o
    obj-$(CONFIG_FIREWIRE_SBP2) += firewire-sbp2.o
    +obj-$(CONFIG_FIREWIRE_NET) += firewire-net.o
    Index: b/drivers/firewire/net.c
    ===================================================================
    --- /dev/null
    +++ b/drivers/firewire/net.c
    @@ -0,0 +1,1655 @@
    +/*
    + * IPv4 over IEEE 1394, per RFC 2734
    + *
    + * Copyright (C) 2009 Jay Fenlason <fenlason@redhat.com>
    + *
    + * based on eth1394 by Ben Collins et al
    + */
    +
    +#include <linux/bug.h>
    +#include <linux/device.h>
    +#include <linux/ethtool.h>
    +#include <linux/firewire.h>
    +#include <linux/firewire-constants.h>
    +#include <linux/highmem.h>
    +#include <linux/in.h>
    +#include <linux/ip.h>
    +#include <linux/jiffies.h>
    +#include <linux/mod_devicetable.h>
    +#include <linux/module.h>
    +#include <linux/moduleparam.h>
    +#include <linux/mutex.h>
    +#include <linux/netdevice.h>
    +#include <linux/skbuff.h>
    +#include <linux/spinlock.h>
    +
    +#include <asm/unaligned.h>
    +#include <net/arp.h>
    +
    +#define FWNET_MAX_FRAGMENTS 25 /* arbitrary limit */
    +#define FWNET_ISO_PAGE_COUNT (PAGE_SIZE < 16 * 1024 ? 4 : 2)
    +
    +#define IEEE1394_BROADCAST_CHANNEL 31
    +#define IEEE1394_ALL_NODES (0xffc0 | 0x003f)
    +#define IEEE1394_MAX_PAYLOAD_S100 512
    +#define FWNET_NO_FIFO_ADDR (~0ULL)
    +
    +#define IANA_SPECIFIER_ID 0x00005eU
    +#define RFC2734_SW_VERSION 0x000001U
    +
    +#define IEEE1394_GASP_HDR_SIZE 8
    +
    +#define RFC2374_UNFRAG_HDR_SIZE 4
    +#define RFC2374_FRAG_HDR_SIZE 8
    +#define RFC2374_FRAG_OVERHEAD 4
    +
    +#define RFC2374_HDR_UNFRAG 0 /* unfragmented */
    +#define RFC2374_HDR_FIRSTFRAG 1 /* first fragment */
    +#define RFC2374_HDR_LASTFRAG 2 /* last fragment */
    +#define RFC2374_HDR_INTFRAG 3 /* interior fragment */
    +
    +#define RFC2734_HW_ADDR_LEN 16
    +
    +struct rfc2734_arp {
    + __be16 hw_type; /* 0x0018 */
    + __be16 proto_type; /* 0x0806 */
    + u8 hw_addr_len; /* 16 */
    + u8 ip_addr_len; /* 4 */
    + __be16 opcode; /* ARP Opcode */
    + /* Above is exactly the same format as struct arphdr */
    +
    + __be64 s_uniq_id; /* Sender's 64bit EUI */
    + u8 max_rec; /* Sender's max packet size */
    + u8 sspd; /* Sender's max speed */
    + __be16 fifo_hi; /* hi 16bits of sender's FIFO addr */
    + __be32 fifo_lo; /* lo 32bits of sender's FIFO addr */
    + __be32 sip; /* Sender's IP Address */
    + __be32 tip; /* IP Address of requested hw addr */
    +} __attribute__((packed));
    +
    +/* This header format is specific to this driver implementation. */
    +#define FWNET_ALEN 8
    +#define FWNET_HLEN 10
    +struct fwnet_header {
    + u8 h_dest[FWNET_ALEN]; /* destination address */
    + __be16 h_proto; /* packet type ID field */
    +} __attribute__((packed));
    +
    +/* IPv4 and IPv6 encapsulation header */
    +struct rfc2734_header {
    + u32 w0;
    + u32 w1;
    +};
    +
    +#define fwnet_get_hdr_lf(h) (((h)->w0 & 0xc0000000) >> 30)
    +#define fwnet_get_hdr_ether_type(h) (((h)->w0 & 0x0000ffff))
    +#define fwnet_get_hdr_dg_size(h) (((h)->w0 & 0x0fff0000) >> 16)
    +#define fwnet_get_hdr_fg_off(h) (((h)->w0 & 0x00000fff))
    +#define fwnet_get_hdr_dgl(h) (((h)->w1 & 0xffff0000) >> 16)
    +
    +#define fwnet_set_hdr_lf(lf) ((lf) << 30)
    +#define fwnet_set_hdr_ether_type(et) (et)
    +#define fwnet_set_hdr_dg_size(dgs) ((dgs) << 16)
    +#define fwnet_set_hdr_fg_off(fgo) (fgo)
    +
    +#define fwnet_set_hdr_dgl(dgl) ((dgl) << 16)
    +
    +static inline void fwnet_make_uf_hdr(struct rfc2734_header *hdr,
    + unsigned ether_type)
    +{
    + hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_UNFRAG)
    + | fwnet_set_hdr_ether_type(ether_type);
    +}
    +
    +static inline void fwnet_make_ff_hdr(struct rfc2734_header *hdr,
    + unsigned ether_type, unsigned dg_size, unsigned dgl)
    +{
    + hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_FIRSTFRAG)
    + | fwnet_set_hdr_dg_size(dg_size)
    + | fwnet_set_hdr_ether_type(ether_type);
    + hdr->w1 = fwnet_set_hdr_dgl(dgl);
    +}
    +
    +static inline void fwnet_make_sf_hdr(struct rfc2734_header *hdr,
    + unsigned lf, unsigned dg_size, unsigned fg_off, unsigned dgl)
    +{
    + hdr->w0 = fwnet_set_hdr_lf(lf)
    + | fwnet_set_hdr_dg_size(dg_size)
    + | fwnet_set_hdr_fg_off(fg_off);
    + hdr->w1 = fwnet_set_hdr_dgl(dgl);
    +}
    +
    +/* This list keeps track of what parts of the datagram have been filled in */
    +struct fwnet_fragment_info {
    + struct list_head fi_link;
    + u16 offset;
    + u16 len;
    +};
    +
    +struct fwnet_partial_datagram {
    + struct list_head pd_link;
    + struct list_head fi_list;
    + struct sk_buff *skb;
    + /* FIXME Why not use skb->data? */
    + char *pbuf;
    + u16 datagram_label;
    + u16 ether_type;
    + u16 datagram_size;
    +};
    +
    +static DEFINE_MUTEX(fwnet_device_mutex);
    +static LIST_HEAD(fwnet_device_list);
    +
    +struct fwnet_device {
    + struct list_head dev_link;
    + spinlock_t lock;
    + enum {
    + FWNET_BROADCAST_ERROR,
    + FWNET_BROADCAST_RUNNING,
    + FWNET_BROADCAST_STOPPED,
    + } broadcast_state;
    + struct fw_iso_context *broadcast_rcv_context;
    + struct fw_iso_buffer broadcast_rcv_buffer;
    + void **broadcast_rcv_buffer_ptrs;
    + unsigned broadcast_rcv_next_ptr;
    + unsigned num_broadcast_rcv_ptrs;
    + unsigned rcv_buffer_size;
    + /*
    + * This value is the maximum unfragmented datagram size that can be
    + * sent by the hardware. It already has the GASP overhead and the
    + * unfragmented datagram header overhead calculated into it.
    + */
    + unsigned broadcast_xmt_max_payload;
    + u16 broadcast_xmt_datagramlabel;
    +
    + /*
    + * The CSR address that remote nodes must send datagrams to for us to
    + * receive them.
    + */
    + struct fw_address_handler handler;
    + u64 local_fifo;
    +
    + /* List of packets to be sent */
    + struct list_head packet_list;
    + /*
    + * List of packets that were broadcasted. When we get an ISO interrupt
    + * one of them has been sent
    + */
    + struct list_head broadcasted_list;
    + /* List of packets that have been sent but not yet acked */
    + struct list_head sent_list;
    +
    + struct list_head peer_list;
    + struct fw_card *card;
    + struct net_device *netdev;
    +};
    +
    +struct fwnet_peer {
    + struct list_head peer_link;
    + struct fwnet_device *dev;
    + u64 guid;
    + u64 fifo;
    +
    + /* guarded by dev->lock */
    + struct list_head pd_list; /* received partial datagrams */
    + unsigned pdg_size; /* pd_list size */
    +
    + u16 datagram_label; /* outgoing datagram label */
    + unsigned max_payload; /* includes RFC2374_FRAG_HDR_SIZE overhead */
    + int node_id;
    + int generation;
    + unsigned speed;
    +};
    +
    +/* This is our task struct. It's used for the packet complete callback. */
    +struct fwnet_packet_task {
    + /*
    + * ptask can actually be on dev->packet_list, dev->broadcasted_list,
    + * or dev->sent_list depending on its current state.
    + */
    + struct list_head pt_link;
    + struct fw_transaction transaction;
    + struct rfc2734_header hdr;
    + struct sk_buff *skb;
    + struct fwnet_device *dev;
    +
    + int outstanding_pkts;
    + unsigned max_payload;
    + u64 fifo_addr;
    + u16 dest_node;
    + u8 generation;
    + u8 speed;
    +};
    +
    +/*
    + * saddr == NULL means use device source address.
    + * daddr == NULL means leave destination address (eg unresolved arp).
    + */
    +static int fwnet_header_create(struct sk_buff *skb, struct net_device *net,
    + unsigned short type, const void *daddr,
    + const void *saddr, unsigned len)
    +{
    + struct fwnet_header *h;
    +
    + h = (struct fwnet_header *)skb_push(skb, sizeof(*h));
    + put_unaligned_be16(type, &h->h_proto);
    +
    + if (net->flags & (IFF_LOOPBACK | IFF_NOARP)) {
    + memset(h->h_dest, 0, net->addr_len);
    +
    + return net->hard_header_len;
    + }
    +
    + if (daddr) {
    + memcpy(h->h_dest, daddr, net->addr_len);
    +
    + return net->hard_header_len;
    + }
    +
    + return -net->hard_header_len;
    +}
    +
    +static int fwnet_header_rebuild(struct sk_buff *skb)
    +{
    + struct fwnet_header *h = (struct fwnet_header *)skb->data;
    +
    + if (get_unaligned_be16(&h->h_proto) == ETH_P_IP)
    + return arp_find((unsigned char *)&h->h_dest, skb);
    +
    + fw_notify("%s: unable to resolve type %04x addresses\n",
    + skb->dev->name, be16_to_cpu(h->h_proto));
    + return 0;
    +}
    +
    +static int fwnet_header_cache(const struct neighbour *neigh,
    + struct hh_cache *hh)
    +{
    + struct net_device *net;
    + struct fwnet_header *h;
    +
    + if (hh->hh_type == cpu_to_be16(ETH_P_802_3))
    + return -1;
    + net = neigh->dev;
    + h = (struct fwnet_header *)((u8 *)hh->hh_data + 16 - sizeof(*h));
    + h->h_proto = hh->hh_type;
    + memcpy(h->h_dest, neigh->ha, net->addr_len);
    + hh->hh_len = FWNET_HLEN;
    +
    + return 0;
    +}
    +
    +/* Called by Address Resolution module to notify changes in address. */
    +static void fwnet_header_cache_update(struct hh_cache *hh,
    + const struct net_device *net, const unsigned char *haddr)
    +{
    + memcpy((u8 *)hh->hh_data + 16 - FWNET_HLEN, haddr, net->addr_len);
    +}
    +
    +static int fwnet_header_parse(const struct sk_buff *skb, unsigned char *haddr)
    +{
    + memcpy(haddr, skb->dev->dev_addr, FWNET_ALEN);
    +
    + return FWNET_ALEN;
    +}
    +
    +static const struct header_ops fwnet_header_ops = {
    + .create = fwnet_header_create,
    + .rebuild = fwnet_header_rebuild,
    + .cache = fwnet_header_cache,
    + .cache_update = fwnet_header_cache_update,
    + .parse = fwnet_header_parse,
    +};
    +
    +/* FIXME: is this correct for all cases? */
    +static bool fwnet_frag_overlap(struct fwnet_partial_datagram *pd,
    + unsigned offset, unsigned len)
    +{
    + struct fwnet_fragment_info *fi;
    + unsigned end = offset + len;
    +
    + list_for_each_entry(fi, &pd->fi_list, fi_link)
    + if (offset < fi->offset + fi->len && end > fi->offset)
    + return true;
    +
    + return false;
    +}
    +
    +/* Assumes that new fragment does not overlap any existing fragments */
    +static struct fwnet_fragment_info *fwnet_frag_new(
    + struct fwnet_partial_datagram *pd, unsigned offset, unsigned len)
    +{
    + struct fwnet_fragment_info *fi, *fi2, *new;
    + struct list_head *list;
    +
    + list = &pd->fi_list;
    + list_for_each_entry(fi, &pd->fi_list, fi_link) {
    + if (fi->offset + fi->len == offset) {
    + /* The new fragment can be tacked on to the end */
    + /* Did the new fragment plug a hole? */
    + fi2 = list_entry(fi->fi_link.next,
    + struct fwnet_fragment_info, fi_link);
    + if (fi->offset + fi->len == fi2->offset) {
    + /* glue fragments together */
    + fi->len += len + fi2->len;
    + list_del(&fi2->fi_link);
    + kfree(fi2);
    + } else {
    + fi->len += len;
    + }
    +
    + return fi;
    + }
    + if (offset + len == fi->offset) {
    + /* The new fragment can be tacked on to the beginning */
    + /* Did the new fragment plug a hole? */
    + fi2 = list_entry(fi->fi_link.prev,
    + struct fwnet_fragment_info, fi_link);
    + if (fi2->offset + fi2->len == fi->offset) {
    + /* glue fragments together */
    + fi2->len += fi->len + len;
    + list_del(&fi->fi_link);
    + kfree(fi);
    +
    + return fi2;
    + }
    + fi->offset = offset;
    + fi->len += len;
    +
    + return fi;
    + }
    + if (offset > fi->offset + fi->len) {
    + list = &fi->fi_link;
    + break;
    + }
    + if (offset + len < fi->offset) {
    + list = fi->fi_link.prev;
    + break;
    + }
    + }
    +
    + new = kmalloc(sizeof(*new), GFP_ATOMIC);
    + if (!new) {
    + fw_error("out of memory\n");
    + return NULL;
    + }
    +
    + new->offset = offset;
    + new->len = len;
    + list_add(&new->fi_link, list);
    +
    + return new;
    +}
    +
    +static struct fwnet_partial_datagram *fwnet_pd_new(struct net_device *net,
    + struct fwnet_peer *peer, u16 datagram_label, unsigned dg_size,
    + void *frag_buf, unsigned frag_off, unsigned frag_len)
    +{
    + struct fwnet_partial_datagram *new;
    + struct fwnet_fragment_info *fi;
    +
    + new = kmalloc(sizeof(*new), GFP_ATOMIC);
    + if (!new)
    + goto fail;
    +
    + INIT_LIST_HEAD(&new->fi_list);
    + fi = fwnet_frag_new(new, frag_off, frag_len);
    + if (fi == NULL)
    + goto fail_w_new;
    +
    + new->datagram_label = datagram_label;
    + new->datagram_size = dg_size;
    + new->skb = dev_alloc_skb(dg_size + net->hard_header_len + 15);
    + if (new->skb == NULL)
    + goto fail_w_fi;
    +
    + skb_reserve(new->skb, (net->hard_header_len + 15) & ~15);
    + new->pbuf = skb_put(new->skb, dg_size);
    + memcpy(new->pbuf + frag_off, frag_buf, frag_len);
    + list_add_tail(&new->pd_link, &peer->pd_list);
    +
    + return new;
    +
    +fail_w_fi:
    + kfree(fi);
    +fail_w_new:
    + kfree(new);
    +fail:
    + fw_error("out of memory\n");
    +
    + return NULL;
    +}
    +
    +static struct fwnet_partial_datagram *fwnet_pd_find(struct fwnet_peer *peer,
    + u16 datagram_label)
    +{
    + struct fwnet_partial_datagram *pd;
    +
    + list_for_each_entry(pd, &peer->pd_list, pd_link)
    + if (pd->datagram_label == datagram_label)
    + return pd;
    +
    + return NULL;
    +}
    +
    +
    +static void fwnet_pd_delete(struct fwnet_partial_datagram *old)
    +{
    + struct fwnet_fragment_info *fi, *n;
    +
    + list_for_each_entry_safe(fi, n, &old->fi_list, fi_link)
    + kfree(fi);
    +
    + list_del(&old->pd_link);
    + dev_kfree_skb_any(old->skb);
    + kfree(old);
    +}
    +
    +static bool fwnet_pd_update(struct fwnet_peer *peer,
    + struct fwnet_partial_datagram *pd, void *frag_buf,
    + unsigned frag_off, unsigned frag_len)
    +{
    + if (fwnet_frag_new(pd, frag_off, frag_len) == NULL)
    + return false;
    +
    + 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_move_tail(&pd->pd_link, &peer->pd_list);
    +
    + return true;
    +}
    +
    +static bool fwnet_pd_is_complete(struct fwnet_partial_datagram *pd)
    +{
    + struct fwnet_fragment_info *fi;
    +
    + fi = list_entry(pd->fi_list.next, struct fwnet_fragment_info, fi_link);
    +
    + return fi->len == pd->datagram_size;
    +}
    +
    +/* caller must hold dev->lock */
    +static struct fwnet_peer *fwnet_peer_find_by_guid(struct fwnet_device *dev,
    + u64 guid)
    +{
    + struct fwnet_peer *peer;
    +
    + list_for_each_entry(peer, &dev->peer_list, peer_link)
    + if (peer->guid == guid)
    + return peer;
    +
    + return NULL;
    +}
    +
    +/* caller must hold dev->lock */
    +static struct fwnet_peer *fwnet_peer_find_by_node_id(struct fwnet_device *dev,
    + int node_id, int generation)
    +{
    + struct fwnet_peer *peer;
    +
    + list_for_each_entry(peer, &dev->peer_list, peer_link)
    + if (peer->node_id == node_id &&
    + peer->generation == generation)
    + return peer;
    +
    + return NULL;
    +}
    +
    +/* See IEEE 1394-2008 table 6-4, table 8-8, table 16-18. */
    +static unsigned fwnet_max_payload(unsigned max_rec, unsigned speed)
    +{
    + max_rec = min(max_rec, speed + 8);
    + max_rec = min(max_rec, 0xbU); /* <= 4096 */
    + if (max_rec < 8) {
    + fw_notify("max_rec %x out of range\n", max_rec);
    + max_rec = 8;
    + }
    +
    + return (1 << (max_rec + 1)) - RFC2374_FRAG_HDR_SIZE;
    +}
    +
    +
    +static int fwnet_finish_incoming_packet(struct net_device *net,
    + struct sk_buff *skb, u16 source_node_id,
    + bool is_broadcast, u16 ether_type)
    +{
    + struct fwnet_device *dev;
    + static const __be64 broadcast_hw = cpu_to_be64(~0ULL);
    + int status;
    + __be64 guid;
    +
    + dev = netdev_priv(net);
    + /* Write metadata, and then pass to the receive level */
    + skb->dev = net;
    + 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, as well as arp
    + * conversion if needed. ARP conversion is easier in this
    + * direction, since we are using ethernet as our backend.
    + */
    + /*
    + * 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 == ETH_P_ARP) {
    + struct rfc2734_arp *arp1394;
    + struct arphdr *arp;
    + unsigned char *arp_ptr;
    + u64 fifo_addr;
    + u64 peer_guid;
    + unsigned sspd;
    + u16 max_payload;
    + struct fwnet_peer *peer;
    + unsigned long flags;
    +
    + arp1394 = (struct rfc2734_arp *)skb->data;
    + arp = (struct arphdr *)skb->data;
    + arp_ptr = (unsigned char *)(arp + 1);
    + peer_guid = get_unaligned_be64(&arp1394->s_uniq_id);
    + fifo_addr = (u64)get_unaligned_be16(&arp1394->fifo_hi) << 32
    + | get_unaligned_be32(&arp1394->fifo_lo);
    +
    + sspd = arp1394->sspd;
    + /* Sanity check. OS X 10.3 PPC reportedly sends 131. */
    + if (sspd > SCODE_3200) {
    + fw_notify("sspd %x out of range\n", sspd);
    + sspd = SCODE_3200;
    + }
    + max_payload = fwnet_max_payload(arp1394->max_rec, sspd);
    +
    + spin_lock_irqsave(&dev->lock, flags);
    + peer = fwnet_peer_find_by_guid(dev, peer_guid);
    + if (peer) {
    + peer->fifo = fifo_addr;
    +
    + if (peer->speed > sspd)
    + peer->speed = sspd;
    + if (peer->max_payload > max_payload)
    + peer->max_payload = max_payload;
    + }
    + spin_unlock_irqrestore(&dev->lock, flags);
    +
    + if (!peer) {
    + fw_notify("No peer for ARP packet from %016llx\n",
    + (unsigned long long)peer_guid);
    + goto failed_proto;
    + }
    +
    + /*
    + * 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;
    + /* skip over sender unique id */
    + arp_ptr += arp->ar_hln;
    + /* move sender IP addr */
    + put_unaligned(arp1394->sip, (u32 *)arp_ptr);
    + /* skip over sender IP addr */
    + arp_ptr += arp->ar_pln;
    +
    + if (arp->ar_op == htons(ARPOP_REQUEST))
    + memset(arp_ptr, 0, sizeof(u64));
    + else
    + memcpy(arp_ptr, net->dev_addr, sizeof(u64));
    + }
    +
    + /* Now add the ethernet header. */
    + guid = cpu_to_be64(dev->card->guid);
    + if (dev_hard_header(skb, net, ether_type,
    + is_broadcast ? &broadcast_hw : &guid,
    + NULL, skb->len) >= 0) {
    + struct fwnet_header *eth;
    + u16 *rawp;
    + __be16 protocol;
    +
    + skb_reset_mac_header(skb);
    + skb_pull(skb, sizeof(*eth));
    + eth = (struct fwnet_header *)skb_mac_header(skb);
    + if (*eth->h_dest & 1) {
    + if (memcmp(eth->h_dest, net->broadcast,
    + net->addr_len) == 0)
    + skb->pkt_type = PACKET_BROADCAST;
    +#if 0
    + else
    + skb->pkt_type = PACKET_MULTICAST;
    +#endif
    + } else {
    + if (memcmp(eth->h_dest, net->dev_addr, net->addr_len))
    + skb->pkt_type = PACKET_OTHERHOST;
    + }
    + if (ntohs(eth->h_proto) >= 1536) {
    + protocol = eth->h_proto;
    + } else {
    + rawp = (u16 *)skb->data;
    + if (*rawp == 0xffff)
    + protocol = htons(ETH_P_802_3);
    + else
    + protocol = htons(ETH_P_802_2);
    + }
    + skb->protocol = protocol;
    + }
    + status = netif_rx(skb);
    + if (status == NET_RX_DROP) {
    + net->stats.rx_errors++;
    + net->stats.rx_dropped++;
    + } else {
    + net->stats.rx_packets++;
    + net->stats.rx_bytes += skb->len;
    + }
    + if (netif_queue_stopped(net))
    + netif_wake_queue(net);
    +
    + return 0;
    +
    + failed_proto:
    + net->stats.rx_errors++;
    + net->stats.rx_dropped++;
    +
    + dev_kfree_skb_any(skb);
    + if (netif_queue_stopped(net))
    + netif_wake_queue(net);
    +
    + net->last_rx = jiffies;
    +
    + return 0;
    +}
    +
    +static int fwnet_incoming_packet(struct fwnet_device *dev, __be32 *buf, int len,
    + int source_node_id, int generation,
    + bool is_broadcast)
    +{
    + struct sk_buff *skb;
    + struct net_device *net = dev->netdev;
    + struct rfc2734_header hdr;
    + unsigned lf;
    + unsigned long flags;
    + struct fwnet_peer *peer;
    + struct fwnet_partial_datagram *pd;
    + int fg_off;
    + int dg_size;
    + u16 datagram_label;
    + int retval;
    + u16 ether_type;
    +
    + hdr.w0 = be32_to_cpu(buf[0]);
    + lf = fwnet_get_hdr_lf(&hdr);
    + if (lf == RFC2374_HDR_UNFRAG) {
    + /*
    + * 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.
    + */
    + ether_type = fwnet_get_hdr_ether_type(&hdr);
    + buf++;
    + len -= RFC2374_UNFRAG_HDR_SIZE;
    +
    + skb = dev_alloc_skb(len + net->hard_header_len + 15);
    + if (unlikely(!skb)) {
    + fw_error("out of memory\n");
    + net->stats.rx_dropped++;
    +
    + return -1;
    + }
    + skb_reserve(skb, (net->hard_header_len + 15) & ~15);
    + memcpy(skb_put(skb, len), buf, len);
    +
    + return fwnet_finish_incoming_packet(net, skb, source_node_id,
    + is_broadcast, ether_type);
    + }
    + /* A datagram fragment has been received, now the fun begins. */
    + hdr.w1 = ntohl(buf[1]);
    + buf += 2;
    + len -= RFC2374_FRAG_HDR_SIZE;
    + if (lf == RFC2374_HDR_FIRSTFRAG) {
    + ether_type = fwnet_get_hdr_ether_type(&hdr);
    + fg_off = 0;
    + } else {
    + ether_type = 0;
    + fg_off = fwnet_get_hdr_fg_off(&hdr);
    + }
    + datagram_label = fwnet_get_hdr_dgl(&hdr);
    + dg_size = fwnet_get_hdr_dg_size(&hdr); /* ??? + 1 */
    +
    + spin_lock_irqsave(&dev->lock, flags);
    +
    + peer = fwnet_peer_find_by_node_id(dev, source_node_id, generation);
    + if (!peer)
    + goto bad_proto;
    +
    + pd = fwnet_pd_find(peer, datagram_label);
    + if (pd == NULL) {
    + while (peer->pdg_size >= FWNET_MAX_FRAGMENTS) {
    + /* remove the oldest */
    + fwnet_pd_delete(list_first_entry(&peer->pd_list,
    + struct fwnet_partial_datagram, pd_link));
    + peer->pdg_size--;
    + }
    + pd = fwnet_pd_new(net, peer, datagram_label,
    + dg_size, buf, fg_off, len);
    + if (pd == NULL) {
    + retval = -ENOMEM;
    + goto bad_proto;
    + }
    + peer->pdg_size++;
    + } else {
    + if (fwnet_frag_overlap(pd, fg_off, len) ||
    + pd->datagram_size != dg_size) {
    + /*
    + * Differing datagram sizes or overlapping fragments,
    + * discard old datagram and start a new one.
    + */
    + fwnet_pd_delete(pd);
    + pd = fwnet_pd_new(net, peer, datagram_label,
    + dg_size, buf, fg_off, len);
    + if (pd == NULL) {
    + retval = -ENOMEM;
    + peer->pdg_size--;
    + goto bad_proto;
    + }
    + } else {
    + if (!fwnet_pd_update(peer, pd, buf, fg_off, len)) {
    + /*
    + * Couldn't save off fragment anyway
    + * so might as well obliterate the
    + * datagram now.
    + */
    + fwnet_pd_delete(pd);
    + peer->pdg_size--;
    + goto bad_proto;
    + }
    + }
    + } /* new datagram or add to existing one */
    +
    + if (lf == RFC2374_HDR_FIRSTFRAG)
    + pd->ether_type = ether_type;
    +
    + if (fwnet_pd_is_complete(pd)) {
    + ether_type = pd->ether_type;
    + peer->pdg_size--;
    + skb = skb_get(pd->skb);
    + fwnet_pd_delete(pd);
    +
    + spin_unlock_irqrestore(&dev->lock, flags);
    +
    + return fwnet_finish_incoming_packet(net, skb, source_node_id,
    + false, ether_type);
    + }
    + /*
    + * Datagram is not complete, we're done for the
    + * moment.
    + */
    + spin_unlock_irqrestore(&dev->lock, flags);
    +
    + return 0;
    +
    + bad_proto:
    + spin_unlock_irqrestore(&dev->lock, flags);
    +
    + if (netif_queue_stopped(net))
    + netif_wake_queue(net);
    +
    + return 0;
    +}
    +
    +static void fwnet_receive_packet(struct fw_card *card, struct fw_request *r,
    + int tcode, int destination, int source, int generation,
    + int speed, unsigned long long offset, void *payload,
    + size_t length, void *callback_data)
    +{
    + struct fwnet_device *dev = callback_data;
    + int rcode;
    +
    + if (destination == IEEE1394_ALL_NODES) {
    + kfree(r);
    +
    + return;
    + }
    +
    + if (offset != dev->handler.offset)
    + rcode = RCODE_ADDRESS_ERROR;
    + else if (tcode != TCODE_WRITE_BLOCK_REQUEST)
    + rcode = RCODE_TYPE_ERROR;
    + else if (fwnet_incoming_packet(dev, payload, length,
    + source, generation, false) != 0) {
    + fw_error("Incoming packet failure\n");
    + rcode = RCODE_CONFLICT_ERROR;
    + } else
    + rcode = RCODE_COMPLETE;
    +
    + fw_send_response(card, r, rcode);
    +}
    +
    +static void fwnet_receive_broadcast(struct fw_iso_context *context,
    + u32 cycle, size_t header_length, void *header, void *data)
    +{
    + struct fwnet_device *dev;
    + struct fw_iso_packet packet;
    + struct fw_card *card;
    + __be16 *hdr_ptr;
    + __be32 *buf_ptr;
    + int retval;
    + u32 length;
    + u16 source_node_id;
    + u32 specifier_id;
    + u32 ver;
    + unsigned long offset;
    + unsigned long flags;
    +
    + dev = data;
    + card = dev->card;
    + hdr_ptr = header;
    + length = be16_to_cpup(hdr_ptr);
    +
    + spin_lock_irqsave(&dev->lock, flags);
    +
    + offset = dev->rcv_buffer_size * dev->broadcast_rcv_next_ptr;
    + buf_ptr = dev->broadcast_rcv_buffer_ptrs[dev->broadcast_rcv_next_ptr++];
    + if (dev->broadcast_rcv_next_ptr == dev->num_broadcast_rcv_ptrs)
    + dev->broadcast_rcv_next_ptr = 0;
    +
    + spin_unlock_irqrestore(&dev->lock, flags);
    +
    + specifier_id = (be32_to_cpu(buf_ptr[0]) & 0xffff) << 8
    + | (be32_to_cpu(buf_ptr[1]) & 0xff000000) >> 24;
    + ver = be32_to_cpu(buf_ptr[1]) & 0xffffff;
    + source_node_id = be32_to_cpu(buf_ptr[0]) >> 16;
    +
    + if (specifier_id == IANA_SPECIFIER_ID && ver == RFC2734_SW_VERSION) {
    + buf_ptr += 2;
    + length -= IEEE1394_GASP_HDR_SIZE;
    + fwnet_incoming_packet(dev, buf_ptr, length,
    + source_node_id, -1, true);
    + }
    +
    + packet.payload_length = dev->rcv_buffer_size;
    + packet.interrupt = 1;
    + packet.skip = 0;
    + packet.tag = 3;
    + packet.sy = 0;
    + packet.header_length = IEEE1394_GASP_HDR_SIZE;
    +
    + spin_lock_irqsave(&dev->lock, flags);
    +
    + retval = fw_iso_context_queue(dev->broadcast_rcv_context, &packet,
    + &dev->broadcast_rcv_buffer, offset);
    +
    + spin_unlock_irqrestore(&dev->lock, flags);
    +
    + if (retval < 0)
    + fw_error("requeue failed\n");
    +}
    +
    +static struct kmem_cache *fwnet_packet_task_cache;
    +
    +static int fwnet_send_packet(struct fwnet_packet_task *ptask);
    +
    +static void fwnet_transmit_packet_done(struct fwnet_packet_task *ptask)
    +{
    + struct fwnet_device *dev;
    + unsigned long flags;
    +
    + dev = ptask->dev;
    +
    + spin_lock_irqsave(&dev->lock, flags);
    + list_del(&ptask->pt_link);
    + spin_unlock_irqrestore(&dev->lock, flags);
    +
    + ptask->outstanding_pkts--; /* FIXME access inside lock */
    +
    + if (ptask->outstanding_pkts > 0) {
    + u16 dg_size;
    + u16 fg_off;
    + u16 datagram_label;
    + u16 lf;
    + struct sk_buff *skb;
    +
    + /* Update the ptask to point to the next fragment and send it */
    + lf = fwnet_get_hdr_lf(&ptask->hdr);
    + switch (lf) {
    + case RFC2374_HDR_LASTFRAG:
    + case RFC2374_HDR_UNFRAG:
    + default:
    + fw_error("Outstanding packet %x lf %x, header %x,%x\n",
    + ptask->outstanding_pkts, lf, ptask->hdr.w0,
    + ptask->hdr.w1);
    + BUG();
    +
    + case RFC2374_HDR_FIRSTFRAG:
    + /* Set frag type here for future interior fragments */
    + dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
    + fg_off = ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
    + datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
    + break;
    +
    + case RFC2374_HDR_INTFRAG:
    + dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
    + fg_off = fwnet_get_hdr_fg_off(&ptask->hdr)
    + + ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
    + datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
    + break;
    + }
    + skb = ptask->skb;
    + skb_pull(skb, ptask->max_payload);
    + if (ptask->outstanding_pkts > 1) {
    + fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_INTFRAG,
    + dg_size, fg_off, datagram_label);
    + } else {
    + fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_LASTFRAG,
    + dg_size, fg_off, datagram_label);
    + ptask->max_payload = skb->len + RFC2374_FRAG_HDR_SIZE;
    + }
    + fwnet_send_packet(ptask);
    + } else {
    + dev_kfree_skb_any(ptask->skb);
    + kmem_cache_free(fwnet_packet_task_cache, ptask);
    + }
    +}
    +
    +static void fwnet_write_complete(struct fw_card *card, int rcode,
    + void *payload, size_t length, void *data)
    +{
    + struct fwnet_packet_task *ptask;
    +
    + ptask = data;
    +
    + if (rcode == RCODE_COMPLETE)
    + fwnet_transmit_packet_done(ptask);
    + else
    + fw_error("fwnet_write_complete: failed: %x\n", rcode);
    + /* ??? error recovery */
    +}
    +
    +static int fwnet_send_packet(struct fwnet_packet_task *ptask)
    +{
    + struct fwnet_device *dev;
    + unsigned tx_len;
    + struct rfc2734_header *bufhdr;
    + unsigned long flags;
    +
    + dev = ptask->dev;
    + tx_len = ptask->max_payload;
    + switch (fwnet_get_hdr_lf(&ptask->hdr)) {
    + case RFC2374_HDR_UNFRAG:
    + bufhdr = (struct rfc2734_header *)
    + skb_push(ptask->skb, RFC2374_UNFRAG_HDR_SIZE);
    + put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
    + break;
    +
    + case RFC2374_HDR_FIRSTFRAG:
    + case RFC2374_HDR_INTFRAG:
    + case RFC2374_HDR_LASTFRAG:
    + bufhdr = (struct rfc2734_header *)
    + skb_push(ptask->skb, RFC2374_FRAG_HDR_SIZE);
    + put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
    + put_unaligned_be32(ptask->hdr.w1, &bufhdr->w1);
    + break;
    +
    + default:
    + BUG();
    + }
    + if (ptask->dest_node == IEEE1394_ALL_NODES) {
    + u8 *p;
    + int generation;
    + int node_id;
    +
    + /* ptask->generation may not have been set yet */
    + generation = dev->card->generation;
    + smp_rmb();
    + node_id = dev->card->node_id;
    +
    + p = skb_push(ptask->skb, 8);
    + put_unaligned_be32(node_id << 16 | IANA_SPECIFIER_ID >> 8, p);
    + put_unaligned_be32((IANA_SPECIFIER_ID & 0xff) << 24
    + | RFC2734_SW_VERSION, &p[4]);
    +
    + /* We should not transmit if broadcast_channel.valid == 0. */
    + fw_send_request(dev->card, &ptask->transaction,
    + TCODE_STREAM_DATA,
    + fw_stream_packet_destination_id(3,
    + IEEE1394_BROADCAST_CHANNEL, 0),
    + generation, SCODE_100, 0ULL, ptask->skb->data,
    + tx_len + 8, fwnet_write_complete, ptask);
    +
    + /* FIXME race? */
    + spin_lock_irqsave(&dev->lock, flags);
    + list_add_tail(&ptask->pt_link, &dev->broadcasted_list);
    + spin_unlock_irqrestore(&dev->lock, flags);
    +
    + return 0;
    + }
    +
    + fw_send_request(dev->card, &ptask->transaction,
    + TCODE_WRITE_BLOCK_REQUEST, ptask->dest_node,
    + ptask->generation, ptask->speed, ptask->fifo_addr,
    + ptask->skb->data, tx_len, fwnet_write_complete, ptask);
    +
    + /* FIXME race? */
    + spin_lock_irqsave(&dev->lock, flags);
    + list_add_tail(&ptask->pt_link, &dev->sent_list);
    + spin_unlock_irqrestore(&dev->lock, flags);
    +
    + dev->netdev->trans_start = jiffies;
    +
    + return 0;
    +}
    +
    +static int fwnet_broadcast_start(struct fwnet_device *dev)
    +{
    + struct fw_iso_context *context;
    + int retval;
    + unsigned num_packets;
    + unsigned max_receive;
    + struct fw_iso_packet packet;
    + unsigned long offset;
    + unsigned u;
    +
    + if (dev->local_fifo == FWNET_NO_FIFO_ADDR) {
    + /* outside OHCI posted write area? */
    + static const struct fw_address_region region = {
    + .start = 0xffff00000000ULL,
    + .end = CSR_REGISTER_BASE,
    + };
    +
    + dev->handler.length = 4096;
    + dev->handler.address_callback = fwnet_receive_packet;
    + dev->handler.callback_data = dev;
    +
    + retval = fw_core_add_address_handler(&dev->handler, &region);
    + if (retval < 0)
    + goto failed_initial;
    +
    + dev->local_fifo = dev->handler.offset;
    + }
    +
    + max_receive = 1U << (dev->card->max_receive + 1);
    + num_packets = (FWNET_ISO_PAGE_COUNT * PAGE_SIZE) / max_receive;
    +
    + if (!dev->broadcast_rcv_context) {
    + void **ptrptr;
    +
    + context = fw_iso_context_create(dev->card,
    + FW_ISO_CONTEXT_RECEIVE, IEEE1394_BROADCAST_CHANNEL,
    + dev->card->link_speed, 8, fwnet_receive_broadcast, dev);
    + if (IS_ERR(context)) {
    + retval = PTR_ERR(context);
    + goto failed_context_create;
    + }
    +
    + retval = fw_iso_buffer_init(&dev->broadcast_rcv_buffer,
    + dev->card, FWNET_ISO_PAGE_COUNT, DMA_FROM_DEVICE);
    + if (retval < 0)
    + goto failed_buffer_init;
    +
    + ptrptr = kmalloc(sizeof(void *) * num_packets, GFP_KERNEL);
    + if (!ptrptr) {
    + retval = -ENOMEM;
    + goto failed_ptrs_alloc;
    + }
    +
    + dev->broadcast_rcv_buffer_ptrs = ptrptr;
    + for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++) {
    + void *ptr;
    + unsigned v;
    +
    + ptr = kmap(dev->broadcast_rcv_buffer.pages[u]);
    + for (v = 0; v < num_packets / FWNET_ISO_PAGE_COUNT; v++)
    + *ptrptr++ = (void *)
    + ((char *)ptr + v * max_receive);
    + }
    + dev->broadcast_rcv_context = context;
    + } else {
    + context = dev->broadcast_rcv_context;
    + }
    +
    + packet.payload_length = max_receive;
    + packet.interrupt = 1;
    + packet.skip = 0;
    + packet.tag = 3;
    + packet.sy = 0;
    + packet.header_length = IEEE1394_GASP_HDR_SIZE;
    + offset = 0;
    +
    + for (u = 0; u < num_packets; u++) {
    + retval = fw_iso_context_queue(context, &packet,
    + &dev->broadcast_rcv_buffer, offset);
    + if (retval < 0)
    + goto failed_rcv_queue;
    +
    + offset += max_receive;
    + }
    + dev->num_broadcast_rcv_ptrs = num_packets;
    + dev->rcv_buffer_size = max_receive;
    + dev->broadcast_rcv_next_ptr = 0U;
    + retval = fw_iso_context_start(context, -1, 0,
    + FW_ISO_CONTEXT_MATCH_ALL_TAGS); /* ??? sync */
    + if (retval < 0)
    + goto failed_rcv_queue;
    +
    + /* FIXME: adjust it according to the min. speed of all known peers? */
    + dev->broadcast_xmt_max_payload = IEEE1394_MAX_PAYLOAD_S100
    + - IEEE1394_GASP_HDR_SIZE - RFC2374_UNFRAG_HDR_SIZE;
    + dev->broadcast_state = FWNET_BROADCAST_RUNNING;
    +
    + return 0;
    +
    + failed_rcv_queue:
    + kfree(dev->broadcast_rcv_buffer_ptrs);
    + dev->broadcast_rcv_buffer_ptrs = NULL;
    + failed_ptrs_alloc:
    + fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer, dev->card);
    + failed_buffer_init:
    + fw_iso_context_destroy(context);
    + dev->broadcast_rcv_context = NULL;
    + failed_context_create:
    + fw_core_remove_address_handler(&dev->handler);
    + failed_initial:
    + dev->local_fifo = FWNET_NO_FIFO_ADDR;
    +
    + return retval;
    +}
    +
    +/* ifup */
    +static int fwnet_open(struct net_device *net)
    +{
    + struct fwnet_device *dev = netdev_priv(net);
    + int ret;
    +
    + if (dev->broadcast_state == FWNET_BROADCAST_ERROR) {
    + ret = fwnet_broadcast_start(dev);
    + if (ret)
    + return ret;
    + }
    + netif_start_queue(net);
    +
    + return 0;
    +}
    +
    +/* ifdown */
    +static int fwnet_stop(struct net_device *net)
    +{
    + netif_stop_queue(net);
    +
    + /* Deallocate iso context for use by other applications? */
    +
    + return 0;
    +}
    +
    +static int fwnet_tx(struct sk_buff *skb, struct net_device *net)
    +{
    + struct fwnet_header hdr_buf;
    + struct fwnet_device *dev = netdev_priv(net);
    + __be16 proto;
    + u16 dest_node;
    + unsigned max_payload;
    + u16 dg_size;
    + u16 *datagram_label_ptr;
    + struct fwnet_packet_task *ptask;
    + struct fwnet_peer *peer;
    + unsigned long flags;
    +
    + ptask = kmem_cache_alloc(fwnet_packet_task_cache, GFP_ATOMIC);
    + if (ptask == NULL)
    + goto fail;
    +
    + skb = skb_share_check(skb, GFP_ATOMIC);
    + if (!skb)
    + goto fail;
    +
    + /*
    + * Make a copy of the driver-specific header.
    + * We might need to rebuild the header on tx failure.
    + */
    + memcpy(&hdr_buf, skb->data, sizeof(hdr_buf));
    + skb_pull(skb, sizeof(hdr_buf));
    +
    + proto = hdr_buf.h_proto;
    + dg_size = skb->len;
    +
    + /* serialize access to peer, including peer->datagram_label */
    + spin_lock_irqsave(&dev->lock, flags);
    +
    + /*
    + * Set the transmission type for the packet. ARP packets and IP
    + * broadcast packets are sent via GASP.
    + */
    + if (memcmp(hdr_buf.h_dest, net->broadcast, FWNET_ALEN) == 0
    + || proto == htons(ETH_P_ARP)
    + || (proto == htons(ETH_P_IP)
    + && IN_MULTICAST(ntohl(ip_hdr(skb)->daddr)))) {
    + max_payload = dev->broadcast_xmt_max_payload;
    + datagram_label_ptr = &dev->broadcast_xmt_datagramlabel;
    +
    + ptask->fifo_addr = FWNET_NO_FIFO_ADDR;
    + ptask->generation = 0;
    + ptask->dest_node = IEEE1394_ALL_NODES;
    + ptask->speed = SCODE_100;
    + } else {
    + __be64 guid = get_unaligned((__be64 *)hdr_buf.h_dest);
    + u8 generation;
    +
    + peer = fwnet_peer_find_by_guid(dev, be64_to_cpu(guid));
    + if (!peer || peer->fifo == FWNET_NO_FIFO_ADDR)
    + goto fail_unlock;
    +
    + generation = peer->generation;
    + dest_node = peer->node_id;
    + max_payload = peer->max_payload;
    + datagram_label_ptr = &peer->datagram_label;
    +
    + ptask->fifo_addr = peer->fifo;
    + ptask->generation = generation;
    + ptask->dest_node = dest_node;
    + ptask->speed = peer->speed;
    + }
    +
    + /* If this is an ARP packet, convert it */
    + if (proto == htons(ETH_P_ARP)) {
    + struct arphdr *arp = (struct arphdr *)skb->data;
    + unsigned char *arp_ptr = (unsigned char *)(arp + 1);
    + struct rfc2734_arp *arp1394 = (struct rfc2734_arp *)skb->data;
    + __be32 ipaddr;
    +
    + ipaddr = get_unaligned((__be32 *)(arp_ptr + FWNET_ALEN));
    +
    + arp1394->hw_addr_len = RFC2734_HW_ADDR_LEN;
    + arp1394->max_rec = dev->card->max_receive;
    + arp1394->sspd = dev->card->link_speed;
    +
    + put_unaligned_be16(dev->local_fifo >> 32,
    + &arp1394->fifo_hi);
    + put_unaligned_be32(dev->local_fifo & 0xffffffff,
    + &arp1394->fifo_lo);
    + put_unaligned(ipaddr, &arp1394->sip);
    + }
    +
    + ptask->hdr.w0 = 0;
    + ptask->hdr.w1 = 0;
    + ptask->skb = skb;
    + ptask->dev = dev;
    +
    + /* Does it all fit in one packet? */
    + if (dg_size <= max_payload) {
    + fwnet_make_uf_hdr(&ptask->hdr, ntohs(proto));
    + ptask->outstanding_pkts = 1;
    + max_payload = dg_size + RFC2374_UNFRAG_HDR_SIZE;
    + } else {
    + u16 datagram_label;
    +
    + max_payload -= RFC2374_FRAG_OVERHEAD;
    + datagram_label = (*datagram_label_ptr)++;
    + fwnet_make_ff_hdr(&ptask->hdr, ntohs(proto), dg_size,
    + datagram_label);
    + ptask->outstanding_pkts = DIV_ROUND_UP(dg_size, max_payload);
    + max_payload += RFC2374_FRAG_HDR_SIZE;
    + }
    +
    + spin_unlock_irqrestore(&dev->lock, flags);
    +
    + ptask->max_payload = max_payload;
    + fwnet_send_packet(ptask);
    +
    + return NETDEV_TX_OK;
    +
    + fail_unlock:
    + spin_unlock_irqrestore(&dev->lock, flags);
    + fail:
    + if (ptask)
    + kmem_cache_free(fwnet_packet_task_cache, ptask);
    +
    + if (skb != NULL)
    + dev_kfree_skb(skb);
    +
    + net->stats.tx_dropped++;
    + net->stats.tx_errors++;
    +
    + /*
    + * FIXME: According to a patch from 2003-02-26, "returning non-zero
    + * causes serious problems" here, allegedly. Before that patch,
    + * -ERRNO was returned which is not appropriate under Linux 2.6.
    + * Perhaps more needs to be done? Stop the queue in serious
    + * conditions and restart it elsewhere?
    + */
    + return NETDEV_TX_OK;
    +}
    +
    +static int fwnet_change_mtu(struct net_device *net, int new_mtu)
    +{
    + if (new_mtu < 68)
    + return -EINVAL;
    +
    + net->mtu = new_mtu;
    + return 0;
    +}
    +
    +static void fwnet_get_drvinfo(struct net_device *net,
    + struct ethtool_drvinfo *info)
    +{
    + strcpy(info->driver, KBUILD_MODNAME);
    + strcpy(info->bus_info, "ieee1394");
    +}
    +
    +static struct ethtool_ops fwnet_ethtool_ops = {
    + .get_drvinfo = fwnet_get_drvinfo,
    +};
    +
    +static const struct net_device_ops fwnet_netdev_ops = {
    + .ndo_open = fwnet_open,
    + .ndo_stop = fwnet_stop,
    + .ndo_start_xmit = fwnet_tx,
    + .ndo_change_mtu = fwnet_change_mtu,
    +};
    +
    +static void fwnet_init_dev(struct net_device *net)
    +{
    + net->header_ops = &fwnet_header_ops;
    + net->netdev_ops = &fwnet_netdev_ops;
    + net->watchdog_timeo = 2 * HZ;
    + net->flags = IFF_BROADCAST | IFF_MULTICAST;
    + net->features = NETIF_F_HIGHDMA;
    + net->addr_len = FWNET_ALEN;
    + net->hard_header_len = FWNET_HLEN;
    + net->type = ARPHRD_IEEE1394;
    + net->tx_queue_len = 10;
    + SET_ETHTOOL_OPS(net, &fwnet_ethtool_ops);
    +}
    +
    +/* caller must hold fwnet_device_mutex */
    +static struct fwnet_device *fwnet_dev_find(struct fw_card *card)
    +{
    + struct fwnet_device *dev;
    +
    + list_for_each_entry(dev, &fwnet_device_list, dev_link)
    + if (dev->card == card)
    + return dev;
    +
    + return NULL;
    +}
    +
    +static int fwnet_add_peer(struct fwnet_device *dev,
    + struct fw_unit *unit, struct fw_device *device)
    +{
    + struct fwnet_peer *peer;
    +
    + peer = kmalloc(sizeof(*peer), GFP_KERNEL);
    + if (!peer)
    + return -ENOMEM;
    +
    + dev_set_drvdata(&unit->device, peer);
    +
    + peer->dev = dev;
    + peer->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4];
    + peer->fifo = FWNET_NO_FIFO_ADDR;
    + INIT_LIST_HEAD(&peer->pd_list);
    + peer->pdg_size = 0;
    + peer->datagram_label = 0;
    + peer->speed = device->max_speed;
    + peer->max_payload = fwnet_max_payload(device->max_rec, peer->speed);
    +
    + peer->generation = device->generation;
    + smp_rmb();
    + peer->node_id = device->node_id;
    +
    + spin_lock_irq(&dev->lock);
    + list_add_tail(&peer->peer_link, &dev->peer_list);
    + spin_unlock_irq(&dev->lock);
    +
    + return 0;
    +}
    +
    +static int fwnet_probe(struct device *_dev)
    +{
    + struct fw_unit *unit = fw_unit(_dev);
    + struct fw_device *device = fw_parent_device(unit);
    + struct fw_card *card = device->card;
    + struct net_device *net;
    + bool allocated_netdev = false;
    + struct fwnet_device *dev;
    + unsigned max_mtu;
    + int ret;
    +
    + mutex_lock(&fwnet_device_mutex);
    +
    + dev = fwnet_dev_find(card);
    + if (dev) {
    + net = dev->netdev;
    + goto have_dev;
    + }
    +
    + net = alloc_netdev(sizeof(*dev), "firewire%d", fwnet_init_dev);
    + if (net == NULL) {
    + ret = -ENOMEM;
    + goto out;
    + }
    +
    + allocated_netdev = true;
    + SET_NETDEV_DEV(net, card->device);
    + dev = netdev_priv(net);
    +
    + spin_lock_init(&dev->lock);
    + dev->broadcast_state = FWNET_BROADCAST_ERROR;
    + dev->broadcast_rcv_context = NULL;
    + dev->broadcast_xmt_max_payload = 0;
    + dev->broadcast_xmt_datagramlabel = 0;
    +
    + dev->local_fifo = FWNET_NO_FIFO_ADDR;
    +
    + INIT_LIST_HEAD(&dev->packet_list);
    + INIT_LIST_HEAD(&dev->broadcasted_list);
    + INIT_LIST_HEAD(&dev->sent_list);
    + INIT_LIST_HEAD(&dev->peer_list);
    +
    + dev->card = card;
    + dev->netdev = net;
    +
    + /*
    + * Use the RFC 2734 default 1500 octets or the maximum payload
    + * as initial MTU
    + */
    + max_mtu = (1 << (card->max_receive + 1))
    + - sizeof(struct rfc2734_header) - IEEE1394_GASP_HDR_SIZE;
    + net->mtu = min(1500U, max_mtu);
    +
    + /* Set our hardware address while we're at it */
    + put_unaligned_be64(card->guid, net->dev_addr);
    + put_unaligned_be64(~0ULL, net->broadcast);
    + ret = register_netdev(net);
    + if (ret) {
    + fw_error("Cannot register the driver\n");
    + goto out;
    + }
    +
    + list_add_tail(&dev->dev_link, &fwnet_device_list);
    + fw_notify("%s: IPv4 over FireWire on device %016llx\n",
    + net->name, (unsigned long long)card->guid);
    + have_dev:
    + ret = fwnet_add_peer(dev, unit, device);
    + if (ret && allocated_netdev) {
    + unregister_netdev(net);
    + list_del(&dev->dev_link);
    + }
    + out:
    + if (ret && allocated_netdev)
    + free_netdev(net);
    +
    + mutex_unlock(&fwnet_device_mutex);
    +
    + return ret;
    +}
    +
    +static void fwnet_remove_peer(struct fwnet_peer *peer)
    +{
    + struct fwnet_partial_datagram *pd, *pd_next;
    +
    + spin_lock_irq(&peer->dev->lock);
    + list_del(&peer->peer_link);
    + spin_unlock_irq(&peer->dev->lock);
    +
    + list_for_each_entry_safe(pd, pd_next, &peer->pd_list, pd_link)
    + fwnet_pd_delete(pd);
    +
    + kfree(peer);
    +}
    +
    +static int fwnet_remove(struct device *_dev)
    +{
    + struct fwnet_peer *peer = dev_get_drvdata(_dev);
    + struct fwnet_device *dev = peer->dev;
    + struct net_device *net;
    + struct fwnet_packet_task *ptask, *pt_next;
    +
    + mutex_lock(&fwnet_device_mutex);
    +
    + fwnet_remove_peer(peer);
    +
    + if (list_empty(&dev->peer_list)) {
    + net = dev->netdev;
    + unregister_netdev(net);
    +
    + if (dev->local_fifo != FWNET_NO_FIFO_ADDR)
    + fw_core_remove_address_handler(&dev->handler);
    + if (dev->broadcast_rcv_context) {
    + fw_iso_context_stop(dev->broadcast_rcv_context);
    + fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer,
    + dev->card);
    + fw_iso_context_destroy(dev->broadcast_rcv_context);
    + }
    + list_for_each_entry_safe(ptask, pt_next,
    + &dev->packet_list, pt_link) {
    + dev_kfree_skb_any(ptask->skb);
    + kmem_cache_free(fwnet_packet_task_cache, ptask);
    + }
    + list_for_each_entry_safe(ptask, pt_next,
    + &dev->broadcasted_list, pt_link) {
    + dev_kfree_skb_any(ptask->skb);
    + kmem_cache_free(fwnet_packet_task_cache, ptask);
    + }
    + list_for_each_entry_safe(ptask, pt_next,
    + &dev->sent_list, pt_link) {
    + dev_kfree_skb_any(ptask->skb);
    + kmem_cache_free(fwnet_packet_task_cache, ptask);
    + }
    + list_del(&dev->dev_link);
    +
    + free_netdev(net);
    + }
    +
    + mutex_unlock(&fwnet_device_mutex);
    +
    + return 0;
    +}
    +
    +/*
    + * FIXME abort partially sent fragmented datagrams,
    + * discard partially received fragmented datagrams
    + */
    +static void fwnet_update(struct fw_unit *unit)
    +{
    + struct fw_device *device = fw_parent_device(unit);
    + struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
    + int generation;
    +
    + generation = device->generation;
    +
    + spin_lock_irq(&peer->dev->lock);
    + peer->node_id = device->node_id;
    + peer->generation = generation;
    + spin_unlock_irq(&peer->dev->lock);
    +}
    +
    +static const struct ieee1394_device_id fwnet_id_table[] = {
    + {
    + .match_flags = IEEE1394_MATCH_SPECIFIER_ID |
    + IEEE1394_MATCH_VERSION,
    + .specifier_id = IANA_SPECIFIER_ID,
    + .version = RFC2734_SW_VERSION,
    + },
    + { }
    +};
    +
    +static struct fw_driver fwnet_driver = {
    + .driver = {
    + .owner = THIS_MODULE,
    + .name = "net",
    + .bus = &fw_bus_type,
    + .probe = fwnet_probe,
    + .remove = fwnet_remove,
    + },
    + .update = fwnet_update,
    + .id_table = fwnet_id_table,
    +};
    +
    +static const u32 rfc2374_unit_directory_data[] = {
    + 0x00040000, /* directory_length */
    + 0x1200005e, /* unit_specifier_id: IANA */
    + 0x81000003, /* textual descriptor offset */
    + 0x13000001, /* unit_sw_version: RFC 2734 */
    + 0x81000005, /* textual descriptor offset */
    + 0x00030000, /* descriptor_length */
    + 0x00000000, /* text */
    + 0x00000000, /* minimal ASCII, en */
    + 0x49414e41, /* I A N A */
    + 0x00030000, /* descriptor_length */
    + 0x00000000, /* text */
    + 0x00000000, /* minimal ASCII, en */
    + 0x49507634, /* I P v 4 */
    +};
    +
    +static struct fw_descriptor rfc2374_unit_directory = {
    + .length = ARRAY_SIZE(rfc2374_unit_directory_data),
    + .key = (CSR_DIRECTORY | CSR_UNIT) << 24,
    + .data = rfc2374_unit_directory_data
    +};
    +
    +static int __init fwnet_init(void)
    +{
    + int err;
    +
    + err = fw_core_add_descriptor(&rfc2374_unit_directory);
    + if (err)
    + return err;
    +
    + fwnet_packet_task_cache = kmem_cache_create("packet_task",
    + sizeof(struct fwnet_packet_task), 0, 0, NULL);
    + if (!fwnet_packet_task_cache) {
    + err = -ENOMEM;
    + goto out;
    + }
    +
    + err = driver_register(&fwnet_driver.driver);
    + if (!err)
    + return 0;
    +
    + kmem_cache_destroy(fwnet_packet_task_cache);
    +out:
    + fw_core_remove_descriptor(&rfc2374_unit_directory);
    +
    + return err;
    +}
    +module_init(fwnet_init);
    +
    +static void __exit fwnet_cleanup(void)
    +{
    + driver_unregister(&fwnet_driver.driver);
    + kmem_cache_destroy(fwnet_packet_task_cache);
    + fw_core_remove_descriptor(&rfc2374_unit_directory);
    +}
    +module_exit(fwnet_cleanup);
    +
    +MODULE_AUTHOR("Jay Fenlason <fenlason@redhat.com>");
    +MODULE_DESCRIPTION("IPv4 over IEEE1394 as per RFC 2734");
    +MODULE_LICENSE("GPL");
    +MODULE_DEVICE_TABLE(ieee1394, fwnet_id_table);
    Index: b/drivers/ieee1394/Kconfig
    ===================================================================
    --- a/drivers/ieee1394/Kconfig
    +++ b/drivers/ieee1394/Kconfig
    @@ -105,7 +105,7 @@ config IEEE1394_ETH1394_ROM_ENTRY
    default n

    config IEEE1394_ETH1394
    - tristate "IP over 1394"
    + tristate "IP networking over 1394"
    depends on IEEE1394 && EXPERIMENTAL && INET
    select IEEE1394_ETH1394_ROM_ENTRY
    help
    --
    Stefan Richter
    -=====-==--= -==- =---=
    http://arcgraph.de/sr/


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