diff options
Diffstat (limited to 'drivers/firewire/net.c')
| -rw-r--r-- | drivers/firewire/net.c | 1819 |
1 files changed, 1819 insertions, 0 deletions
diff --git a/drivers/firewire/net.c b/drivers/firewire/net.c new file mode 100644 index 00000000000..15353886bd8 --- /dev/null +++ b/drivers/firewire/net.c @@ -0,0 +1,1819 @@ +/* + * 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/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/mod_devicetable.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/netdevice.h> +#include <linux/skbuff.h> + +#include <asm/unaligned.h> +#include <net/arp.h> + +/* Things to potentially make runtime cofigurable */ +/* must be at least as large as our maximum receive size */ +#define FIFO_SIZE 4096 +/* Network timeout in glibbles */ +#define IPV4_TIMEOUT 100000 + +/* Runitme configurable paramaters */ +static int ipv4_mpd = 25; +static int ipv4_max_xmt = 0; +/* 16k for receiving arp and broadcast packets. Enough? */ +static int ipv4_iso_page_count = 4; + +MODULE_AUTHOR("Jay Fenlason (fenlason@redhat.com)"); +MODULE_DESCRIPTION("Firewire IPv4 Driver (IPv4-over-IEEE1394 as per RFC 2734)"); +MODULE_LICENSE("GPL"); +MODULE_DEVICE_TABLE(ieee1394, ipv4_id_table); +module_param_named(max_partial_datagrams, ipv4_mpd, int, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(max_partial_datagrams, "Maximum number of received" + " incomplete fragmented datagrams (default = 25)."); + +/* Max xmt is useful for forcing fragmentation, which makes testing easier. */ +module_param_named(max_transmit, ipv4_max_xmt, int, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(max_transmit, "Maximum datagram size to transmit" + " (larger datagrams will be fragmented) (default = 0 (use hardware defaults)."); + +/* iso page count controls how many pages will be used for receiving broadcast packets. */ +module_param_named(iso_pages, ipv4_iso_page_count, int, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(iso_pages, "Number of pages to use for receiving broadcast packets" + " (default = 4)."); + +/* uncomment this line to do debugging */ +#define fw_debug(s, args...) printk(KERN_DEBUG KBUILD_MODNAME ": " s, ## args) + +/* comment out these lines to do debugging. */ +/* #undef fw_debug */ +/* #define fw_debug(s...) */ +/* #define print_hex_dump(l...) */ + +/* Define a fake hardware header format for the networking core. Note that + * header size cannot exceed 16 bytes as that is the size of the header cache. + * Also, we do not need the source address in the header so we omit it and + * keep the header to under 16 bytes */ +#define IPV4_ALEN (8) +/* This must equal sizeof(struct ipv4_ether_hdr) */ +#define IPV4_HLEN (10) + +/* FIXME: what's a good size for this? */ +#define INVALID_FIFO_ADDR (u64)~0ULL + +/* Things specified by standards */ +#define BROADCAST_CHANNEL 31 + +#define S100_BUFFER_SIZE 512 +#define MAX_BUFFER_SIZE 4096 + +#define IPV4_GASP_SPECIFIER_ID 0x00005EU +#define IPV4_GASP_VERSION 0x00000001U + +#define IPV4_GASP_OVERHEAD (2 * sizeof(u32)) /* for GASP header */ + +#define IPV4_UNFRAG_HDR_SIZE sizeof(u32) +#define IPV4_FRAG_HDR_SIZE (2 * sizeof(u32)) +#define IPV4_FRAG_OVERHEAD sizeof(u32) + +#define ALL_NODES (0xffc0 | 0x003f) + +#define IPV4_HDR_UNFRAG 0 /* unfragmented */ +#define IPV4_HDR_FIRSTFRAG 1 /* first fragment */ +#define IPV4_HDR_LASTFRAG 2 /* last fragment */ +#define IPV4_HDR_INTFRAG 3 /* interior fragment */ + +/* Our arp packet (ARPHRD_IEEE1394) */ +/* FIXME: note that this is probably bogus on weird-endian machines */ +struct ipv4_arp { + u16 hw_type; /* 0x0018 */ + u16 proto_type; /* 0x0806 */ + u8 hw_addr_len; /* 16 */ + u8 ip_addr_len; /* 4 */ + u16 opcode; /* ARP Opcode */ + /* Above is exactly the same format as struct arphdr */ + + u64 s_uniq_id; /* Sender's 64bit EUI */ + u8 max_rec; /* Sender's max packet size */ + u8 sspd; /* Sender's max speed */ + u16 fifo_hi; /* hi 16bits of sender's FIFO addr */ + u32 fifo_lo; /* lo 32bits of sender's FIFO addr */ + u32 sip; /* Sender's IP Address */ + u32 tip; /* IP Address of requested hw addr */ +} __attribute__((packed)); + +struct ipv4_ether_hdr { + unsigned char h_dest[IPV4_ALEN]; /* destination address */ + unsigned short h_proto; /* packet type ID field */ +} __attribute__((packed)); + +static inline struct ipv4_ether_hdr *ipv4_ether_hdr(const struct sk_buff *skb) +{ + return (struct ipv4_ether_hdr *)skb_mac_header(skb); +} + +enum ipv4_tx_type { + IPV4_UNKNOWN = 0, + IPV4_GASP = 1, + IPV4_WRREQ = 2, +}; + +enum ipv4_broadcast_state { + IPV4_BROADCAST_ERROR, + IPV4_BROADCAST_RUNNING, + IPV4_BROADCAST_STOPPED, +}; + +#define ipv4_get_hdr_lf(h) (((h)->w0&0xC0000000)>>30) +#define ipv4_get_hdr_ether_type(h) (((h)->w0&0x0000FFFF) ) +#define ipv4_get_hdr_dg_size(h) (((h)->w0&0x0FFF0000)>>16) +#define ipv4_get_hdr_fg_off(h) (((h)->w0&0x00000FFF) ) +#define ipv4_get_hdr_dgl(h) (((h)->w1&0xFFFF0000)>>16) + +#define ipv4_set_hdr_lf(lf) (( lf)<<30) +#define ipv4_set_hdr_ether_type(et) (( et) ) +#define ipv4_set_hdr_dg_size(dgs) ((dgs)<<16) +#define ipv4_set_hdr_fg_off(fgo) ((fgo) ) + +#define ipv4_set_hdr_dgl(dgl) ((dgl)<<16) + +struct ipv4_hdr { + u32 w0; + u32 w1; +}; + +static inline void ipv4_make_uf_hdr( struct ipv4_hdr *hdr, unsigned ether_type) { + hdr->w0 = ipv4_set_hdr_lf(IPV4_HDR_UNFRAG) + |ipv4_set_hdr_ether_type(ether_type); + fw_debug ( "Setting unfragmented header %p to %x\n", hdr, hdr->w0 ); +} + +static inline void ipv4_make_ff_hdr ( struct ipv4_hdr *hdr, unsigned ether_type, unsigned dg_size, unsigned dgl ) { + hdr->w0 = ipv4_set_hdr_lf(IPV4_HDR_FIRSTFRAG) + |ipv4_set_hdr_dg_size(dg_size) + |ipv4_set_hdr_ether_type(ether_type); + hdr->w1 = ipv4_set_hdr_dgl(dgl); + fw_debug ( "Setting fragmented header %p to first_frag %x,%x (et %x, dgs %x, dgl %x)\n", hdr, hdr->w0, hdr->w1, + ether_type, dg_size, dgl ); +} + +static inline void ipv4_make_sf_hdr ( struct ipv4_hdr *hdr, unsigned lf, unsigned dg_size, unsigned fg_off, unsigned dgl) { + hdr->w0 = ipv4_set_hdr_lf(lf) + |ipv4_set_hdr_dg_size(dg_size) + |ipv4_set_hdr_fg_off(fg_off); + hdr->w1 = ipv4_set_hdr_dgl(dgl); + fw_debug ( "Setting fragmented header %p to %x,%x (lf %x, dgs %x, fo %x dgl %x)\n", + hdr, hdr->w0, hdr->w1, + lf, dg_size, fg_off, dgl ); +} + +/* End of IP1394 headers */ + +/* Fragment types */ +#define ETH1394_HDR_LF_UF 0 /* unfragmented */ +#define ETH1394_HDR_LF_FF 1 /* first fragment */ +#define ETH1394_HDR_LF_LF 2 /* last fragment */ +#define ETH1394_HDR_LF_IF 3 /* interior fragment */ + +#define IP1394_HW_ADDR_LEN 16 /* As per RFC */ + +/* This list keeps track of what parts of the datagram have been filled in */ +struct ipv4_fragment_info { + struct list_head fragment_info; + u16 offset; + u16 len; +}; + +struct ipv4_partial_datagram { + struct list_head pdg_list; + struct list_head fragment_info; + struct sk_buff *skb; + /* FIXME Why not use skb->data? */ + char *pbuf; + u16 datagram_label; + u16 ether_type; + u16 datagram_size; +}; + +/* + * We keep one of these for each IPv4 capable device attached to a fw_card. + * The list of them is stored in the fw_card structure rather than in the + * ipv4_priv because the remote IPv4 nodes may be probed before the card is, + * so we need a place to store them before the ipv4_priv structure is + * allocated. + */ +struct ipv4_node { + struct list_head ipv4_nodes; + /* guid of the remote node */ + u64 guid; + /* FIFO address to transmit datagrams to, or INVALID_FIFO_ADDR */ + u64 fifo; + + spinlock_t pdg_lock; /* partial datagram lock */ + /* List of partial datagrams received from this node */ + struct list_head pdg_list; + /* Number of entries in pdg_list at the moment */ + unsigned pdg_size; + + /* max payload to transmit to this remote node */ + /* This already includes the IPV4_FRAG_HDR_SIZE overhead */ + u16 max_payload; + /* outgoing datagram label */ + u16 datagram_label; + /* Current node_id of the remote node */ + u16 nodeid; + /* current generation of the remote node */ + u8 generation; + /* max speed that this node can receive at */ + u8 xmt_speed; +}; + +struct ipv4_priv { + spinlock_t lock; + + enum ipv4_broadcast_state 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; + + /* Wake up to xmt */ + /* struct work_struct wake;*/ + /* 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 fw_card *card; +}; + +/* This is our task struct. It's used for the packet complete callback. */ +struct ipv4_packet_task { + /* + * ptask can actually be on priv->packet_list, priv->broadcasted_list, + * or priv->sent_list depending on its current state. + */ + struct list_head packet_list; + struct fw_transaction transaction; + struct ipv4_hdr hdr; + struct sk_buff *skb; + struct ipv4_priv *priv; + enum ipv4_tx_type tx_type; + int outstanding_pkts; + unsigned max_payload; + u64 fifo_addr; + u16 dest_node; + u8 generation; + u8 speed; +}; + +static struct kmem_cache *ipv4_packet_task_cache; + +static const char ipv4_driver_name[] = "firewire-ipv4"; + +static const struct ieee1394_device_id ipv4_id_table[] = { + { + .match_flags = IEEE1394_MATCH_SPECIFIER_ID | + IEEE1394_MATCH_VERSION, + .specifier_id = IPV4_GASP_SPECIFIER_ID, + .version = IPV4_GASP_VERSION, + }, + { } +}; + +static u32 ipv4_unit_directory_data[] = { + 0x00040000, /* unit directory */ + 0x12000000 | IPV4_GASP_SPECIFIER_ID, /* specifier ID */ + 0x81000003, /* text descriptor */ + 0x13000000 | IPV4_GASP_VERSION, /* version */ + 0x81000005, /* text descriptor */ + + 0x00030000, /* Three quadlets */ + 0x00000000, /* Text */ + 0x00000000, /* Language 0 */ + 0x49414e41, /* I A N A */ + 0x00030000, /* Three quadlets */ + 0x00000000, /* Text */ + 0x00000000, /* Language 0 */ + 0x49507634, /* I P v 4 */ +}; + +static struct fw_descriptor ipv4_unit_directory = { + .length = ARRAY_SIZE(ipv4_unit_directory_data), + .key = 0xd1000000, + .data = ipv4_unit_directory_data +}; + +static int ipv4_send_packet(struct ipv4_packet_task *ptask ); + +/* ------------------------------------------------------------------ */ +/****************************************** + * 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 ipv4_header ( struct sk_buff *skb, struct net_device *dev, + unsigned short type, const void *daddr, + const void *saddr, unsigned len) { + struct ipv4_ether_hdr *eth; + + eth = (struct ipv4_ether_hdr *)skb_push(skb, sizeof(*eth)); + 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 ipv4_rebuild_header(struct sk_buff *skb) +{ + struct ipv4_ether_hdr *eth; + + eth = (struct ipv4_ether_hdr *)skb->data; + if (eth->h_proto == htons(ETH_P_IP)) + return arp_find((unsigned char *)ð->h_dest, skb); + + fw_notify ( "%s: unable to resolve type %04x addresses\n", + skb->dev->name,ntohs(eth->h_proto) ); + return 0; +} + +static int ipv4_header_cache(const struct neighbour *neigh, struct hh_cache *hh) { + unsigned short type = hh->hh_type; + struct net_device *dev; + struct ipv4_ether_hdr *eth; + + if (type == htons(ETH_P_802_3)) + return -1; + dev = neigh->dev; + eth = (struct ipv4_ether_hdr *)((u8 *)hh->hh_data + 16 - sizeof(*eth)); + eth->h_proto = type; + memcpy(eth->h_dest, neigh->ha, dev->addr_len); + + hh->hh_len = IPV4_HLEN; + return 0; +} + +/* Called by Address Resolution module to notify changes in address. */ +static void ipv4_header_cache_update(struct hh_cache *hh, const struct net_device *dev, const unsigned char * haddr ) { + memcpy((u8 *)hh->hh_data + 16 - IPV4_HLEN, haddr, dev->addr_len); +} + +static int ipv4_header_parse(const struct sk_buff *skb, unsigned char *haddr) { + memcpy(haddr, skb->dev->dev_addr, IPV4_ALEN); + return IPV4_ALEN; +} + +static const struct header_ops ipv4_header_ops = { + .create = ipv4_header, + .rebuild = ipv4_rebuild_header, + .cache = ipv4_header_cache, + .cache_update = ipv4_header_cache_update, + .parse = ipv4_header_parse, +}; + +/* ------------------------------------------------------------------ */ + +/* FIXME: is this correct for all cases? */ +static bool ipv4_frag_overlap(struct ipv4_partial_datagram *pd, unsigned offset, unsigned len) +{ + struct ipv4_fragment_info *fi; + unsigned end = offset + len; + + list_for_each_entry(fi, &pd->fragment_info, fragment_info) { + if (offset < fi->offset + fi->len && end > fi->offset) { + fw_debug ( "frag_overlap pd %p fi %p (%x@%x) with %x@%x\n", pd, fi, fi->len, fi->offset, len, offset ); + return true; + } + } + fw_debug ( "frag_overlap %p does not overlap with %x@%x\n", pd, len, offset ); + return false; +} + +/* Assumes that new fragment does not overlap any existing fragments */ +static struct ipv4_fragment_info *ipv4_frag_new ( struct ipv4_partial_datagram *pd, unsigned offset, unsigned len ) { + struct ipv4_fragment_info *fi, *fi2, *new; + struct list_head *list; + + fw_debug ( "frag_new pd %p %x@%x\n", pd, len, offset ); + list = &pd->fragment_info; + list_for_each_entry(fi, &pd->fragment_info, fragment_info) { + 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->fragment_info.next, struct ipv4_fragment_info, fragment_info); + if (fi->offset + fi->len == fi2->offset) { + fw_debug ( "pd %p: hole filling %p (%x@%x) and %p(%x@%x): now %x@%x\n", pd, fi, fi->len, fi->offset, + fi2, fi2->len, fi2->offset, fi->len + len + fi2->len, fi->offset ); + /* glue fragments together */ + fi->len += len + fi2->len; + list_del(&fi2->fragment_info); + kfree(fi2); + } else { + fw_debug ( "pd %p: extending %p from %x@%x to %x@%x\n", pd, fi, fi->len, fi->offset, fi->len+len, fi->offset ); + 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->fragment_info.prev, struct ipv4_fragment_info, fragment_info); + if (fi2->offset + fi2->len == fi->offset) { + /* glue fragments together */ + fw_debug ( "pd %p: extending %p and merging with %p from %x@%x to %x@%x\n", + pd, fi2, fi, fi2->len, fi2->offset, fi2->len + fi->len + len, fi2->offset ); + fi2->len += fi->len + len; + list_del(&fi->fragment_info); + kfree(fi); + return fi2; + } + fw_debug ( "pd %p: extending %p from %x@%x to %x@%x\n", pd, fi, fi->len, fi->offset, offset, fi->len + len ); + fi->offset = offset; + fi->len += len; + return fi; + } + if (offset > fi->offset + fi->len) { + list = &fi->fragment_info; + break; + } + if (offset + len < fi->offset) { + list = fi->fragment_info.prev; + break; + } + } + + new = kmalloc(sizeof(*new), GFP_ATOMIC); + if (!new) { + fw_error ( "out of memory in fragment handling!\n" ); + return NULL; + } + + new->offset = offset; + new->len = len; + list_add(&new->fragment_info, list); + fw_debug ( "pd %p: new frag %p %x@%x\n", pd, new, new->len, new->offset ); + list_for_each_entry( fi, &pd->fragment_info, fragment_info ) + fw_debug ( "fi %p %x@%x\n", fi, fi->len, fi->offset ); + return new; +} + +/* ------------------------------------------------------------------ */ + +static struct ipv4_partial_datagram *ipv4_pd_new(struct net_device *netdev, + struct ipv4_node *node, u16 datagram_label, unsigned dg_size, u32 *frag_buf, + unsigned frag_off, unsigned frag_len) { + struct ipv4_partial_datagram *new; + struct ipv4_fragment_info *fi; + + new = kmalloc(sizeof(*new), GFP_ATOMIC); + if (!new) + goto fail; + INIT_LIST_HEAD(&new->fragment_info); + fi = ipv4_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 + netdev->hard_header_len + 15); + if ( new->skb == NULL ) + goto fail_w_fi; + skb_reserve(new->skb, (netdev->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->pdg_list, &node->pdg_list); + fw_debug ( "pd_new: new pd %p { dgl %u, dg_size %u, skb %p, pbuf %p } on node %p\n", + new, new->datagram_label, new->datagram_size, new->skb, new->pbuf, node ); + return new; + +fail_w_fi: + kfree(fi); +fail_w_new: + kfree(new); +fail: + fw_error("ipv4_pd_new: no memory\n"); + return NULL; +} + +static struct ipv4_partial_datagram *ipv4_pd_find(struct ipv4_node *node, u16 datagram_label) { + struct ipv4_partial_datagram *pd; + + list_for_each_entry(pd, &node->pdg_list, pdg_list) { + if ( pd->datagram_label == datagram_label ) { + fw_debug ( "pd_find(node %p, label %u): pd %p\n", node, datagram_label, pd ); + return pd; + } + } + fw_debug ( "pd_find(node %p, label %u) no entry\n", node, datagram_label ); + return NULL; +} + + +static void ipv4_pd_delete ( struct ipv4_partial_datagram *old ) { + struct ipv4_fragment_info *fi, *n; + + fw_debug ( "pd_delete %p\n", old ); + list_for_each_entry_safe(fi, n, &old->fragment_info, fragment_info) { + fw_debug ( "Freeing fi %p\n", fi ); + kfree(fi); + } + list_del(&old->pdg_list); + dev_kfree_skb_any(old->skb); + kfree(old); +} + +static bool ipv4_pd_update ( struct ipv4_node *node, struct ipv4_partial_datagram *pd, + u32 *frag_buf, unsigned frag_off, unsigned frag_len) { + fw_debug ( "pd_update node %p, pd %p, frag_buf %p, %x@%x\n", node, pd, frag_buf, frag_len, frag_off ); + if ( ipv4_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->pdg_list, &node->pdg_list); + fw_debug ( "New pd list:\n" ); + list_for_each_entry ( pd, &node->pdg_list, pdg_list ) { + fw_debug ( "pd %p\n", pd ); + } + return true; +} + +static bool ipv4_pd_is_complete ( struct ipv4_partial_datagram *pd ) { + struct ipv4_fragment_info *fi; + bool ret; + + fi = list_entry(pd->fragment_info.next, struct ipv4_fragment_info, fragment_info); + + ret = (fi->len == pd->datagram_size); + fw_debug ( "pd_is_complete (pd %p, dgs %x): fi %p (%x@%x) %s\n", pd, pd->datagram_size, fi, fi->len, fi->offset, ret ? "yes" : "no" ); + return ret; +} + +/* ------------------------------------------------------------------ */ + +static int ipv4_node_new ( struct fw_card *card, struct fw_device *device ) { + struct ipv4_node *node; + + node = kmalloc ( sizeof(*node), GFP_KERNEL ); + if ( ! node ) { + fw_error ( "allocate new node failed\n" ); + return -ENOMEM; + } + node->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4]; + node->fifo = INVALID_FIFO_ADDR; + INIT_LIST_HEAD(&node->pdg_list); + spin_lock_init(&node->pdg_lock); + node->pdg_size = 0; + node->generation = device->generation; + rmb(); + node->nodeid = device->node_id; + /* FIXME what should it really be? */ + node->max_payload = S100_BUFFER_SIZE - IPV4_UNFRAG_HDR_SIZE; + node->datagram_label = 0U; + node->xmt_speed = device->max_speed; + list_add_tail ( &node->ipv4_nodes, &card->ipv4_nodes ); + fw_debug ( "node_new: %p { guid %016llx, generation %u, nodeid %x, max_payload %x, xmt_speed %x } added\n", + node, (unsigned long long)node->guid, node->generation, node->nodeid, node->max_payload, node->xmt_speed ); + return 0; +} + +static struct ipv4_node *ipv4_node_find_by_guid(struct ipv4_priv *priv, u64 guid) { + struct ipv4_node *node; + unsigned long flags; + + spin_lock_irqsave(&priv->lock, flags); + list_for_each_entry(node, &priv->card->ipv4_nodes, ipv4_nodes) + if (node->guid == guid) { + /* FIXME: lock the node first? */ + spin_unlock_irqrestore ( &priv->lock, flags ); + fw_debug ( "node_find_by_guid (%016llx) found %p\n", (unsigned long long)guid, node ); + return node; + } + + spin_unlock_irqrestore ( &priv->lock, flags ); + fw_debug ( "node_find_by_guid (%016llx) not found\n", (unsigned long long)guid ); + return NULL; +} + +static struct ipv4_node *ipv4_node_find_by_nodeid(struct ipv4_priv *priv, u16 nodeid) { + struct ipv4_node *node; + unsigned long flags; + + spin_lock_irqsave(&priv->lock, flags); + list_for_each_entry(node, &priv->card->ipv4_nodes, ipv4_nodes) + if (node->nodeid == nodeid) { + /* FIXME: lock the node first? */ + spin_unlock_irqrestore ( &priv->lock, flags ); + fw_debug ( "node_find_by_nodeid (%x) found %p\n", nodeid, node ); + return node; + } + fw_debug ( "node_find_by_nodeid (%x) not found\n", nodeid ); + spin_unlock_irqrestore ( &priv->lock, flags ); + return NULL; +} + +/* This is only complicated because we can't assume priv exists */ +static void ipv4_node_delete ( struct fw_card *card, struct fw_device *device ) { + struct net_device *netdev; + struct ipv4_priv *priv; + struct ipv4_node *node; + u64 guid; + unsigned long flags; + struct ipv4_partial_datagram *pd, *pd_next; + + guid = (u64)device->config_rom[3] << 32 | device->config_rom[4]; + netdev = card->netdev; + if ( netdev ) + priv = netdev_priv ( netdev ); + else + priv = NULL; + if ( priv ) + spin_lock_irqsave ( &priv->lock, flags ); + list_for_each_entry( node, &card->ipv4_nodes, ipv4_nodes ) { + if ( node->guid == guid ) { + list_del ( &node->ipv4_nodes ); + list_for_each_entry_safe( pd, pd_next, &node->pdg_list, pdg_list ) + ipv4_pd_delete ( pd ); + break; + } + } + if ( priv ) + spin_unlock_irqrestore ( &priv->lock, flags ); +} + +/* ------------------------------------------------------------------ */ + + +static int ipv4_finish_incoming_packet ( struct net_device *netdev, + struct sk_buff *skb, u16 source_node_id, bool is_broadcast, u16 ether_type ) { + struct ipv4_priv *priv; + static u64 broadcast_hw = ~0ULL; + int status; + u64 guid; + + fw_debug ( "ipv4_finish_incoming_packet(%p, %p, %x, %s, %x\n", + netdev, skb, source_node_id, is_broadcast ? "true" : "false", ether_type ); + priv = netdev_priv(netdev); + /* Write metadata, and then pass to the receive level */ + skb->dev = netdev; + 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 ipv4_arp *arp1394; + struct arphdr *arp; + unsigned char *arp_ptr; + u64 fifo_addr; + u8 max_rec; + u8 sspd; + u16 max_payload; + struct ipv4_node *node; + static const u16 ipv4_speed_to_max_payload[] = { + /* S100, S200, S400, S800, S1600, S3200 */ + 512, 1024, 2048, 4096, 4096, 4096 + }; + + /* fw_debug ( "ARP packet\n" ); */ + arp1394 = (struct ipv4_arp *)skb->data; + arp = (struct arphdr *)skb->data; + arp_ptr = (unsigned char *)(arp + 1); + fifo_addr = (u64)ntohs(arp1394->fifo_hi) << 32 | + ntohl(arp1394->fifo_lo); + max_rec = priv->card->max_receive; + if ( arp1394->max_rec < max_rec ) + max_rec = arp1394->max_rec; + sspd = arp1394->sspd; + /* + * Sanity check. MacOSX seems to be sending us 131 in this + * field (atleast on my Panther G5). Not sure why. + */ + if (sspd > 5 ) { + fw_notify ( "sspd %x out of range\n", sspd ); + sspd = 0; + } + + max_payload = min(ipv4_speed_to_max_payload[sspd], + (u16)(1 << (max_rec + 1))) - IPV4_UNFRAG_HDR_SIZE; + + guid = be64_to_cpu(get_unaligned(&arp1394->s_uniq_id)); + node = ipv4_node_find_by_guid(priv, guid); + if (!node) { + fw_notify ( "No node for ARP packet from %llx\n", guid ); + goto failed_proto; + } + if ( node->nodeid != source_node_id || node->generation != priv->card->generation ) { + fw_notify ( "Internal error: node->nodeid (%x) != soucre_node_id (%x) or node->generation (%x) != priv->card->generation(%x)\n", + node->nodeid, source_node_id, node->generation, priv->card->generation ); + node->nodeid = source_node_id; + node->generation = priv->card->generation; + } + + /* FIXME: for debugging */ + if ( sspd > SCODE_400 ) + sspd = SCODE_400; + /* Update our speed/payload/fifo_offset table */ + /* + * FIXME: this does not handle cases where two high-speed endpoints must use a slower speed because of + * a lower speed hub between them. We need to look at the actual topology map here. + */ + fw_debug ( "Setting node %p fifo %llx (was %llx), max_payload %x (was %x), speed %x (was %x)\n", + node, fifo_addr, node->fifo, max_payload, node->max_payload, sspd, node->xmt_speed ); + node->fifo = fifo_addr; + node->max_payload = max_payload; + /* + * Only allow speeds to go down from their initial value. + * Otherwise a local node that can only do S400 or slower may + * be told to transmit at S800 to a faster remote node. + */ + if ( node->xmt_speed > sspd ) + node->xmt_speed = sspd; + + /* + * 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, netdev->dev_addr, sizeof(u64)); + } + + /* Now add the ethernet header. */ + guid = cpu_to_be64(priv->card->guid); + if (dev_hard_header(skb, netdev, ether_type, is_broadcast ? &broadcast_hw : &guid, NULL, + skb->len) >= 0) { + struct ipv4_ether_hdr *eth; + u16 *rawp; + __be16 protocol; + + skb_reset_mac_header(skb); + skb_pull(skb, sizeof(*eth)); + eth = ipv4_ether_hdr(skb); + if (*eth->h_dest & 1) { + if (memcmp(eth->h_dest, netdev->broadcast, netdev->addr_len) == 0) { + fw_debug ( "Broadcast\n" ); + skb->pkt_type = PACKET_BROADCAST; + } +#if 0 + else + skb->pkt_type = PACKET_MULTICAST; +#endif + } else { + if (memcmp(eth->h_dest, netdev->dev_addr, netdev->addr_len)) { + u64 a1, a2; + + memcpy ( &a1, eth->h_dest, sizeof(u64)); + memcpy ( &a2, netdev->dev_addr, sizeof(u64)); + fw_debug ( "Otherhost %llx %llx %x\n", a1, a2, netdev->addr_len ); + skb->pkt_type = PACKET_OTHERHOST; + } + } + if (ntohs(eth->h_proto) >= 1536) { + fw_debug ( " proto %x %x\n", eth->h_proto, ntohs(eth->h_proto) ); + protocol = eth->h_proto; + } else { + rawp = (u16 *)skb->data; + if (*rawp == 0xFFFF) { + fw_debug ( "proto 802_3\n" ); + protocol = htons(ETH_P_802_3); + } else { + fw_debug ( "proto 802_2\n" ); + protocol = htons(ETH_P_802_2); + } + } + skb->protocol = protocol; + } + status = netif_rx(skb); + if ( status == NET_RX_DROP) { + netdev->stats.rx_errors++; + netdev->stats.rx_dropped++; + } else { + netdev->stats.rx_packets++; + netdev->stats.rx_bytes += skb->len; + } + if (netif_queue_stopped(netdev)) + netif_wake_queue(netdev); + return 0; + + failed_proto: + netdev->stats.rx_errors++; + netdev->stats.rx_dropped++; + dev_kfree_skb_any(skb); + if (netif_queue_stopped(netdev)) + netif_wake_queue(netdev); + netdev->last_rx = jiffies; + return 0; +} + +/* ------------------------------------------------------------------ */ + +static int ipv4_incoming_packet ( struct ipv4_priv *priv, u32 *buf, int len, u16 source_node_id, bool is_broadcast ) { + struct sk_buff *skb; + struct net_device *netdev; + struct ipv4_hdr hdr; + unsigned lf; + unsigned long flags; + struct ipv4_node *node; + struct ipv4_partial_datagram *pd; + int fg_off; + int dg_size; + u16 datagram_label; + int retval; + u16 ether_type; + + fw_debug ( "ipv4_incoming_packet(%p, %p, %d, %x, %s)\n", priv, buf, len, source_node_id, is_broadcast ? "true" : "false" ); + netdev = priv->card->netdev; + + hdr.w0 = ntohl(buf[0]); + lf = ipv4_get_hdr_lf(&hdr); + if ( lf == IPV4_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 = ipv4_get_hdr_ether_type(&hdr); + fw_debug ( "header w0 = %x, lf = %x, ether_type = %x\n", hdr.w0, lf, ether_type ); + buf++; + len -= IPV4_UNFRAG_HDR_SIZE; + + skb = dev_alloc_skb(len + netdev->hard_header_len + 15); + if (unlikely(!skb)) { + fw_error ( "Out of memory for incoming packet\n"); + netdev->stats.rx_dropped++; + return -1; + } + skb_reserve(skb, (netdev->hard_header_len + 15) & ~15); + memcpy(skb_put(skb, len), buf, len ); + return ipv4_finish_incoming_packet(netdev, 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 -= IPV4_FRAG_HDR_SIZE; + if ( lf ==IPV4_HDR_FIRSTFRAG ) { + ether_type = ipv4_get_hdr_ether_type(&hdr); + fg_off = 0; + } else { + fg_off = ipv4_get_hdr_fg_off(&hdr); + ether_type = 0; /* Shut up compiler! */ + } + datagram_label = ipv4_get_hdr_dgl(&hdr); + dg_size = ipv4_get_hdr_dg_size(&hdr); /* ??? + 1 */ + fw_debug ( "fragmented: %x.%x = lf %x, ether_type %x, fg_off %x, dgl %x, dg_size %x\n", hdr.w0, hdr.w1, lf, ether_type, fg_off, datagram_label, dg_size ); + node = ipv4_node_find_by_nodeid ( priv, source_node_id); + spin_lock_irqsave(&node->pdg_lock, flags); + pd = ipv4_pd_find( node, datagram_label ); + if (pd == NULL) { + while ( node->pdg_size >= ipv4_mpd ) { + /* remove the oldest */ + ipv4_pd_delete ( list_first_entry(&node->pdg_list, struct ipv4_partial_datagram, pdg_list) ); + node->pdg_size--; + } + pd = ipv4_pd_new ( netdev, node, datagram_label, dg_size, + buf, fg_off, len); + if ( pd == NULL) { + retval = -ENOMEM; + goto bad_proto; + } + node->pdg_size++; + } else { + if (ipv4_frag_overlap(pd, fg_off, len) || pd->datagram_size != dg_size) { + /* + * Differing datagram sizes or overlapping fragments, + * Either way the remote machine is playing silly buggers + * with us: obliterate the old datagram and start a new one. + */ + ipv4_pd_delete ( pd ); + pd = ipv4_pd_new ( netdev, node, datagram_label, + dg_size, buf, fg_off, len); + if ( pd == NULL ) { + retval = -ENOMEM; + node->pdg_size--; + goto bad_proto; + } + } else { + bool worked; + + worked = ipv4_pd_update ( node, pd, + buf, fg_off, len ); + if ( ! worked ) { + /* + * Couldn't save off fragment anyway + * so might as well obliterate the + * datagram now. + */ + ipv4_pd_delete ( pd ); + node->pdg_size--; + goto bad_proto; + } + } + } /* new datagram or add to existing one */ + + if ( lf == IPV4_HDR_FIRSTFRAG ) + pd->ether_type = ether_type; + if ( ipv4_pd_is_complete ( pd ) ) { + ether_type = pd->ether_type; + node->pdg_size--; + skb = skb_get(pd->skb); + ipv4_pd_delete ( pd ); + spin_unlock_irqrestore(&node->pdg_lock, flags); + return ipv4_finish_incoming_packet ( netdev, skb, source_node_id, false, ether_type ); + } + /* + * Datagram is not complete, we're done for the + * moment. + */ + spin_unlock_irqrestore(&node->pdg_lock, flags); + return 0; + + bad_proto: + spin_unlock_irqrestore(&node->pdg_lock, flags); + if (netif_queue_stopped(netdev)) + netif_wake_queue(netdev); + return 0; +} + +static void ipv4_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 ipv4_priv *priv; + int status; + + fw_debug ( "ipv4_receive_packet(%p,%p,%x,%x,%x,%x,%x,%llx,%p,%lx,%p)\n", + card, r, tcode, destination, source, generation, speed, offset, payload, + (unsigned long)length, callback_data); + print_hex_dump ( KERN_DEBUG, "header: ", DUMP_PREFIX_OFFSET, 32, 1, payload, length, false ); + priv = callback_data; + if ( tcode != TCODE_WRITE_BLOCK_REQUEST + || destination != card->node_id + || generation != card->generation + || offset != priv->handler.offset ) { + fw_send_response(card, r, RCODE_CONFLICT_ERROR); + fw_debug("Conflict error card node_id=%x, card generation=%x, local offset %llx\n", + card->node_id, card->generation, (unsigned long long)priv->handler.offset ); + return; + } + status = ipv4_incoming_packet ( priv, payload, length, source, false ); + if ( status != 0 ) { + fw_error ( "Incoming packet failure\n" ); + fw_send_response ( card, r, RCODE_CONFLICT_ERROR ); + return; + } + fw_send_response ( card, r, RCODE_COMPLETE ); +} + +static void ipv4_receive_broadcast(struct fw_iso_context *context, u32 cycle, + size_t header_length, void *header, void *data) { + struct ipv4_priv *priv; + struct fw_iso_packet packet; + struct fw_card *card; + u16 *hdr_ptr; + u32 *buf_ptr; + int retval; + u32 length; + u16 source_node_id; + u32 specifier_id; + u32 ver; + unsigned long offset; + unsigned long flags; + + fw_debug ( "ipv4_receive_broadcast ( context=%p, cycle=%x, header_length=%lx, header=%p, data=%p )\n", context, cycle, (unsigned long)header_length, header, data ); + print_hex_dump ( KERN_DEBUG, "header: ", DUMP_PREFIX_OFFSET, 32, 1, header, header_length, false ); + priv = data; + card = priv->card; + hdr_ptr = header; + length = ntohs(hdr_ptr[0]); + spin_lock_irqsave(&priv->lock,flags); + offset = priv->rcv_buffer_size * priv->broadcast_rcv_next_ptr; + buf_ptr = priv->broadcast_rcv_buffer_ptrs[priv->broadcast_rcv_next_ptr++]; + if ( priv->broadcast_rcv_next_ptr == priv->num_broadcast_rcv_ptrs ) + priv->broadcast_rcv_next_ptr = 0; + spin_unlock_irqrestore(&priv->lock,flags); + fw_debug ( "length %u at %p\n", length, buf_ptr ); + print_hex_dump ( KERN_DEBUG, "buffer: ", DUMP_PREFIX_OFFSET, 32, 1, buf_ptr, length, false ); + + 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; + /* fw_debug ( "source %x SpecID %x ver %x\n", source_node_id, specifier_id, ver ); */ + if ( specifier_id == IPV4_GASP_SPECIFIER_ID && ver == IPV4_GASP_VERSION ) { + buf_ptr += 2; + length -= IPV4_GASP_OVERHEAD; + ipv4_incoming_packet(priv, buf_ptr, length, source_node_id, true); + } else + fw_debug ( "Ignoring packet: not GASP\n" ); + packet.payload_length = priv->rcv_buffer_size; + packet.interrupt = 1; + packet.skip = 0; + packet.tag = 3; + packet.sy = 0; + packet.header_length = IPV4_GASP_OVERHEAD; + spin_lock_irqsave(&priv->lock,flags); + retval = fw_iso_context_queue ( priv->broadcast_rcv_context, &packet, + &priv->broadcast_rcv_buffer, offset ); + spin_unlock_irqrestore(&priv->lock,flags); + if ( retval < 0 ) + fw_error ( "requeue failed\n" ); +} + +static void debug_ptask ( struct ipv4_packet_task *ptask ) { + static const char *tx_types[] = { "Unknown", "GASP", "Write" }; + + fw_debug ( "packet %p { hdr { w0 %x w1 %x }, skb %p, priv %p," + " tx_type %s, outstanding_pkts %d, max_payload %x, fifo %llx," + " speed %x, dest_node %x, generation %x }\n", + ptask, ptask->hdr.w0, ptask->hdr.w1, ptask->skb, ptask->priv, + ptask->tx_type > IPV4_WRREQ ? "Invalid" : tx_types[ptask->tx_type], + ptask->outstanding_pkts, ptask->max_payload, + ptask->fifo_addr, ptask->speed, ptask->dest_node, ptask->generation ); + print_hex_dump ( KERN_DEBUG, "packet :", DUMP_PREFIX_OFFSET, 32, 1, + ptask->skb->data, ptask->skb->len, false ); +} + +static void ipv4_transmit_packet_done ( struct ipv4_packet_task *ptask ) { + struct ipv4_priv *priv; + unsigned long flags; + + priv = ptask->priv; + spin_lock_irqsave ( &priv->lock, flags ); + list_del ( &ptask->packet_list ); + spin_unlock_irqrestore ( &priv->lock, flags ); + ptask->outstanding_pkts--; + 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 = ipv4_get_hdr_lf(&ptask->hdr); + switch (lf) { + case IPV4_HDR_LASTFRAG: + case IPV4_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 IPV4_HDR_FIRSTFRAG: + /* Set frag type here for future interior fragments */ + dg_size = ipv4_get_hdr_dg_size(&ptask->hdr); + fg_off = ptask->max_payload - IPV4_FRAG_HDR_SIZE; + datagram_label = ipv4_get_hdr_dgl(&ptask->hdr); + break; + + case IPV4_HDR_INTFRAG: + dg_size = ipv4_get_hdr_dg_size(&ptask->hdr); + fg_off = ipv4_get_hdr_fg_off(&ptask->hdr) + ptask->max_payload - IPV4_FRAG_HDR_SIZE; + datagram_label = ipv4_get_hdr_dgl(&ptask->hdr); + break; + } + skb = ptask->skb; + skb_pull ( skb, ptask->max_payload ); + if ( ptask->outstanding_pkts > 1 ) { + ipv4_make_sf_hdr ( &ptask->hdr, + IPV4_HDR_INTFRAG, dg_size, fg_off, datagram_label ); + } else { + ipv4_make_sf_hdr ( &ptask->hdr, + IPV4_HDR_LASTFRAG, dg_size, fg_off, datagram_label ); + ptask->max_payload = skb->len + IPV4_FRAG_HDR_SIZE; + + } + ipv4_send_packet ( ptask ); + } else { + dev_kfree_skb_any ( ptask->skb ); + kmem_cache_free( ipv4_packet_task_cache, ptask ); + } +} + +static void ipv4_write_complete ( struct fw_card *card, int rcode, + void *payload, size_t length, void *data ) { + struct ipv4_packet_task *ptask; + + ptask = data; + fw_debug ( "ipv4_write_complete ( %p, %x, %p, %lx, %p )\n", + card, rcode, payload, (unsigned long)length, data ); + debug_ptask ( ptask ); + + if ( rcode == RCODE_COMPLETE ) { + ipv4_transmit_packet_done ( ptask ); + } else { + fw_error ( "ipv4_write_complete: failed: %x\n", rcode ); + /* ??? error recovery */ + } +} + +static int ipv4_send_packet ( struct ipv4_packet_task *ptask ) { + struct ipv4_priv *priv; + unsigned tx_len; + struct ipv4_hdr *bufhdr; + unsigned long flags; + struct net_device *netdev; +#if 0 /* stefanr */ + int retval; +#endif + + fw_debug ( "ipv4_send_packet\n" ); + debug_ptask ( ptask ); + priv = ptask->priv; + tx_len = ptask->max_payload; + switch (ipv4_get_hdr_lf(&ptask->hdr)) { + case IPV4_HDR_UNFRAG: + bufhdr = (struct ipv4_hdr *)skb_push(ptask->skb, IPV4_UNFRAG_HDR_SIZE); + bufhdr->w0 = htonl(ptask->hdr.w0); + break; + + case IPV4_HDR_FIRSTFRAG: + case IPV4_HDR_INTFRAG: + case IPV4_HDR_LASTFRAG: + bufhdr = (struct ipv4_hdr *)skb_push(ptask->skb, IPV4_FRAG_HDR_SIZE); + bufhdr->w0 = htonl(ptask->hdr.w0); + bufhdr->w1 = htonl(ptask->hdr.w1); + break; + + default: + BUG(); + } + if ( ptask->tx_type == IPV4_GASP ) { + u32 *packets; + int generation; + int nodeid; + + /* ptask->generation may not have been set yet */ + generation = priv->card->generation; + smp_rmb(); + nodeid = priv->card->node_id; + packets = (u32 *)skb_push(ptask->skb, sizeof(u32)*2); + packets[0] = htonl(nodeid << 16 | (IPV4_GASP_SPECIFIER_ID>>8)); + packets[1] = htonl((IPV4_GASP_SPECIFIER_ID & 0xFF) << 24 | IPV4_GASP_VERSION); + fw_send_request ( priv->card, &ptask->transaction, TCODE_STREAM_DATA, + fw_stream_packet_destination_id(3, BROADCAST_CHANNEL, 0), + generation, SCODE_100, 0ULL, ptask->skb->data, tx_len + 8, ipv4_write_complete, ptask ); + spin_lock_irqsave(&priv->lock,flags); + list_add_tail ( &ptask->packet_list, &priv->broadcasted_list ); + spin_unlock_irqrestore(&priv->lock,flags); +#if 0 /* stefanr */ + return retval; +#else + return 0; +#endif + } + fw_debug("send_request (%p, %p, WRITE_BLOCK, %x, %x, %x, %llx, %p, %d, %p, %p\n", + priv->card, &ptask->transaction, ptask->dest_node, ptask->generation, + ptask->speed, (unsigned long long)ptask->fifo_addr, ptask->skb->data, tx_len, + ipv4_write_complete, ptask ); + fw_send_request ( priv->card, &ptask->transaction, + TCODE_WRITE_BLOCK_REQUEST, ptask->dest_node, ptask->generation, ptask->speed, + ptask->fifo_addr, ptask->skb->data, tx_len, ipv4_write_complete, ptask ); + spin_lock_irqsave(&priv->lock,flags); + list_add_tail ( &ptask->packet_list, &priv->sent_list ); + spin_unlock_irqrestore(&priv->lock,flags); + netdev = priv->card->netdev; + netdev->trans_start = jiffies; + return 0; +} + +static int ipv4_broadcast_start ( struct ipv4_priv *priv ) { + struct fw_iso_context *context; + int retval; + unsigned num_packets; + unsigned max_receive; + struct fw_iso_packet packet; + unsigned long offset; + unsigned u; + /* unsigned transmit_speed; */ + +#if 0 /* stefanr */ + if ( priv->card->broadcast_channel != (BROADCAST_CHANNEL_VALID|BROADCAST_CHANNEL_INITIAL)) { + fw_notify ( "Invalid broadcast channel %x\n", priv->card->broadcast_channel ); + /* FIXME: try again later? */ + /* return -EINVAL; */ + } +#endif + if ( priv->local_fifo == INVALID_FIFO_ADDR ) { + struct fw_address_region region; + + priv->handler.length = FIFO_SIZE; + priv->handler.address_callback = ipv4_receive_packet; + priv->handler.callback_data = priv; + /* FIXME: this is OHCI, but what about others? */ + region.start = 0xffff00000000ULL; + region.end = 0xfffffffffffcULL; + + retval = fw_core_add_address_handler ( &priv->handler, ®ion ); + if ( retval < 0 ) + goto failed_initial; + priv->local_fifo = priv->handler.offset; + } + + /* + * FIXME: rawiso limits us to PAGE_SIZE. This only matters if we ever have + * a machine with PAGE_SIZE < 4096 + */ + max_receive = 1U << (priv->card->max_receive + 1); + num_packets = ( ipv4_iso_page_count * PAGE_SIZE ) / max_receive; + if ( ! priv->broadcast_rcv_context ) { + void **ptrptr; + + context = fw_iso_context_create ( priv->card, + FW_ISO_CONTEXT_RECEIVE, BROADCAST_CHANNEL, + priv->card->link_speed, 8, ipv4_receive_broadcast, priv ); + if (IS_ERR(context)) { + retval = PTR_ERR(context); + goto failed_context_create; + } + retval = fw_iso_buffer_init ( &priv->broadcast_rcv_buffer, + priv->card, ipv4_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; + } + priv->broadcast_rcv_buffer_ptrs = ptrptr; + for ( u = 0; u < ipv4_iso_page_count; u++ ) { + void *ptr; + unsigned v; + + ptr = kmap ( priv->broadcast_rcv_buffer.pages[u] ); + for ( v = 0; v < num_packets / ipv4_iso_page_count; v++ ) + *ptrptr++ = (void *)((char *)ptr + v * max_receive); + } + priv->broadcast_rcv_context = context; + } else + context = priv->broadcast_rcv_context; + + packet.payload_length = max_receive; + packet.interrupt = 1; + packet.skip = 0; + packet.tag = 3; + packet.sy = 0; + packet.header_length = IPV4_GASP_OVERHEAD; + offset = 0; + for ( u = 0; u < num_packets; u++ ) { + retval = fw_iso_context_queue ( context, &packet, + &priv->broadcast_rcv_buffer, offset ); + if ( retval < 0 ) + goto failed_rcv_queue; + offset += max_receive; + } + priv->num_broadcast_rcv_ptrs = num_packets; + priv->rcv_buffer_size = max_receive; + priv->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 this when we know the max receive speeds of all other IP nodes on the bus. */ + /* since we only xmt at S100 ??? */ + priv->broadcast_xmt_max_payload = S100_BUFFER_SIZE - IPV4_GASP_OVERHEAD - IPV4_UNFRAG_HDR_SIZE; + priv->broadcast_state = IPV4_BROADCAST_RUNNING; + return 0; + + failed_rcv_queue: + kfree ( priv->broadcast_rcv_buffer_ptrs ); + priv->broadcast_rcv_buffer_ptrs = NULL; + failed_ptrs_alloc: + fw_iso_buffer_destroy ( &priv->broadcast_rcv_buffer, priv->card ); + failed_buffer_init: + fw_iso_context_destroy ( context ); + priv->broadcast_rcv_context = NULL; + failed_context_create: + fw_core_remove_address_handler ( &priv->handler ); + failed_initial: + priv->local_fifo = INVALID_FIFO_ADDR; + return retval; +} + +/* This is called after an "ifup" */ +static int ipv4_open(struct net_device *dev) { + struct ipv4_priv *priv; + int ret; + + priv = netdev_priv(dev); + if (priv->broadcast_state == IPV4_BROADCAST_ERROR) { + ret = ipv4_broadcast_start ( priv ); + if (ret) + return ret; + } + netif_start_queue(dev); + return 0; +} + +/* This is called after an "ifdown" */ +static int ipv4_stop(struct net_device *netdev) +{ + /* flush priv->wake */ + /* flush_scheduled_work(); */ + + netif_stop_queue(netdev); + return 0; +} + +/* Transmit a packet (called by kernel) */ +static int ipv4_tx(struct sk_buff *skb, struct net_device *netdev) +{ + struct ipv4_ether_hdr hdr_buf; + struct ipv4_priv *priv = netdev_priv(netdev); + __be16 proto; + u16 dest_node; + enum ipv4_tx_type tx_type; + unsigned max_payload; + u16 dg_size; + u16 *datagram_label_ptr; + struct ipv4_packet_task *ptask; + struct ipv4_node *node = NULL; + + ptask = kmem_cache_alloc(ipv4_packet_task_cache, GFP_ATOMIC); + if (ptask == NULL) + goto fail; + + skb = skb_share_check(skb, GFP_ATOMIC); + if (!skb) + goto fail; + + /* + * Get rid of the fake ipv4 header, but first make a copy. + * 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; + + /* + * Set the transmission type for the packet. ARP packets and IP + * broadcast packets are sent via GASP. + */ + if ( memcmp(hdr_buf.h_dest, netdev->broadcast, IPV4_ALEN) == 0 + || proto == htons(ETH_P_ARP) + || ( proto == htons(ETH_P_IP) + && IN_MULTICAST(ntohl(ip_hdr(skb)->daddr)) ) ) { + /* fw_debug ( "transmitting arp or multicast packet\n" );*/ + tx_type = IPV4_GASP; + dest_node = ALL_NODES; + max_payload = priv->broadcast_xmt_max_payload; + /* BUG_ON(max_payload < S100_BUFFER_SIZE - IPV4_GASP_OVERHEAD); */ + datagram_label_ptr = &priv->broadcast_xmt_datagramlabel; + ptask->fifo_addr = INVALID_FIFO_ADDR; + ptask->generation = 0U; + ptask->dest_node = 0U; + ptask->speed = 0; + } else { + __be64 guid = get_unaligned((u64 *)hdr_buf.h_dest); + u8 generation; + + node = ipv4_node_find_by_guid(priv, be64_to_cpu(guid)); + if (!node) { + fw_debug ( "Normal packet but no node\n" ); + goto fail; + } + + if (node->fifo == INVALID_FIFO_ADDR) { + fw_debug ( "Normal packet but no fifo addr\n" ); + goto fail; + } + + /* fw_debug ( "Transmitting normal packet to %x at %llxx\n", node->nodeid, node->fifo ); */ + generation = node->generation; + dest_node = node->nodeid; + max_payload = node->max_payload; + /* BUG_ON(max_payload < S100_BUFFER_SIZE - IPV4_FRAG_HDR_SIZE); */ + + datagram_label_ptr = &node->datagram_label; + tx_type = IPV4_WRREQ; + ptask->fifo_addr = node->fifo; + ptask->generation = generation; + ptask->dest_node = dest_node; + ptask->speed = node->xmt_speed; + } + + /* If this is an ARP packet, convert it */ + if (proto == htons(ETH_P_ARP)) { + /* 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. + */ + struct arphdr *arp = (struct arphdr *)skb->data; + unsigned char *arp_ptr = (unsigned char *)(arp + 1); + struct ipv4_arp *arp1394 = (struct ipv4_arp *)skb->data; + u32 ipaddr; + + ipaddr = *(u32*)(arp_ptr + IPV4_ALEN); + arp1394->hw_addr_len = 16; + arp1394->max_rec = priv->card->max_receive; + arp1394->sspd = priv->card->link_speed; + arp1394->fifo_hi = htons(priv->local_fifo >> 32); + arp1394->fifo_lo = htonl(priv->local_fifo & 0xFFFFFFFF); + arp1394->sip = ipaddr; + } + if ( ipv4_max_xmt && max_payload > ipv4_max_xmt ) + max_payload = ipv4_max_xmt; + + ptask->hdr.w0 = 0; + ptask->hdr.w1 = 0; + ptask->skb = skb; + ptask->priv = priv; + ptask->tx_type = tx_type; + /* Does it all fit in one packet? */ + if ( dg_size <= max_payload ) { + ipv4_make_uf_hdr(&ptask->hdr, be16_to_cpu(proto)); + ptask->outstanding_pkts = 1; + max_payload = dg_size + IPV4_UNFRAG_HDR_SIZE; + } else { + u16 datagram_label; + + max_payload -= IPV4_FRAG_OVERHEAD; + datagram_label = (*datagram_label_ptr)++; + ipv4_make_ff_hdr(&ptask->hdr, be16_to_cpu(proto), dg_size, datagram_label ); + ptask->outstanding_pkts = DIV_ROUND_UP(dg_size, max_payload); + max_payload += IPV4_FRAG_HDR_SIZE; + } + ptask->max_payload = max_payload; + ipv4_send_packet ( ptask ); + return NETDEV_TX_OK; + + fail: + if (ptask) + kmem_cache_free(ipv4_packet_task_cache, ptask); + + if (skb != NULL) + dev_kfree_skb(skb); + + netdev->stats.tx_dropped++; + netdev->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; +} + +/* + * 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 ipv4_tx_timeout(struct net_device *dev) { + struct ipv4_priv *priv; + + priv = netdev_priv(dev); + fw_error ( "%s: Timeout, resetting host\n", dev->name ); +#if 0 /* stefanr */ + fw_core_initiate_bus_reset ( priv->card, 1 ); +#endif +} + +static int ipv4_change_mtu ( struct net_device *dev, int new_mtu ) { +#if 0 + int max_mtu; + struct ipv4_priv *priv; +#endif + + if (new_mtu < 68) + return -EINVAL; + +#if 0 + priv = netdev_priv(dev); + /* This is not actually true because we can fragment packets at the firewire layer */ + max_mtu = (1 << (priv->card->max_receive + 1)) + - sizeof(struct ipv4_hdr) - IPV4_GASP_OVERHEAD; + if (new_mtu > max_mtu) { + fw_notify ( "%s: Local node constrains MTU to %d\n", dev->name, max_mtu); + return -ERANGE; + } +#endif + dev->mtu = new_mtu; + return 0; +} + +static void ipv4_get_drvinfo(struct net_device *dev, +struct ethtool_drvinfo *info) { + strcpy(info->driver, ipv4_driver_name); + strcpy(info->bus_info, "ieee1394"); /* FIXME provide more detail? */ +} + +static struct ethtool_ops ipv4_ethtool_ops = { + .get_drvinfo = ipv4_get_drvinfo, +}; + +static const struct net_device_ops ipv4_netdev_ops = { + .ndo_open = ipv4_open, + .ndo_stop = ipv4_stop, + .ndo_start_xmit = ipv4_tx, + .ndo_tx_timeout = ipv4_tx_timeout, + .ndo_change_mtu = ipv4_change_mtu, +}; + +static void ipv4_init_dev ( struct net_device *dev ) { + dev->header_ops = &ipv4_header_ops; + dev->netdev_ops = &ipv4_netdev_ops; + SET_ETHTOOL_OPS(dev, &ipv4_ethtool_ops); + + dev->watchdog_timeo = IPV4_TIMEOUT; + dev->flags = IFF_BROADCAST | IFF_MULTICAST; + dev->features = NETIF_F_HIGHDMA; + dev->addr_len = IPV4_ALEN; + dev->hard_header_len = IPV4_HLEN; + dev->type = ARPHRD_IEEE1394; + + /* FIXME: This value was copied from ether_setup(). Is it too much? */ + dev->tx_queue_len = 1000; +} + +static int ipv4_probe ( struct device *dev ) { + struct fw_unit * unit; + struct fw_device *device; + struct fw_card *card; + struct net_device *netdev; + struct ipv4_priv *priv; + unsigned max_mtu; + __be64 guid; + + fw_debug("ipv4 Probing\n" ); + unit = fw_unit ( dev ); + device = fw_device ( unit->device.parent ); + card = device->card; + + if ( ! device->is_local ) { + int added; + + fw_debug ( "Non-local, adding remote node entry\n" ); + added = ipv4_node_new ( card, device ); + return added; + } + fw_debug("ipv4 Local: adding netdev\n" ); + netdev = alloc_netdev ( sizeof(*priv), "firewire%d", ipv4_init_dev ); + if ( netdev == NULL) { + fw_error( "Out of memory\n"); + goto out; + } + + SET_NETDEV_DEV(netdev, card->device); + priv = netdev_priv(netdev); + + spin_lock_init(&priv->lock); + priv->broadcast_state = IPV4_BROADCAST_ERROR; + priv->broadcast_rcv_context = NULL; + priv->broadcast_xmt_max_payload = 0; + priv->broadcast_xmt_datagramlabel = 0; + + priv->local_fifo = INVALID_FIFO_ADDR; + + /* INIT_WORK(&priv->wake, ipv4_handle_queue);*/ + INIT_LIST_HEAD(&priv->packet_list); + INIT_LIST_HEAD(&priv->broadcasted_list); + INIT_LIST_HEAD(&priv->sent_list ); + + priv->card = card; + + /* + * Use the RFC 2734 default 1500 octets or the maximum payload + * as initial MTU + */ + max_mtu = (1 << (card->max_receive + 1)) + - sizeof(struct ipv4_hdr) - IPV4_GASP_OVERHEAD; + netdev->mtu = min(1500U, max_mtu); + + /* Set our hardware address while we're at it */ + guid = cpu_to_be64(card->guid); + memcpy(netdev->dev_addr, &guid, sizeof(u64)); + memset(netdev->broadcast, 0xff, sizeof(u64)); + if ( register_netdev ( netdev ) ) { + fw_error ( "Cannot register the driver\n"); + goto out; + } + + fw_notify ( "%s: IPv4 over Firewire on device %016llx\n", + netdev->name, card->guid ); + card->netdev = netdev; + + return 0 /* ipv4_new_node ( ud ) */; + out: + if ( netdev ) + free_netdev ( netdev ); + return -ENOENT; +} + + +static int ipv4_remove ( struct device *dev ) { + struct fw_unit * unit; + struct fw_device *device; + struct fw_card *card; + struct net_device *netdev; + struct ipv4_priv *priv; + struct ipv4_node *node; + struct ipv4_partial_datagram *pd, *pd_next; + struct ipv4_packet_task *ptask, *pt_next; + + fw_debug("ipv4 Removing\n" ); + unit = fw_unit ( dev ); + device = fw_device ( unit->device.parent ); + card = device->card; + + if ( ! device->is_local ) { + fw_debug ( "Node %x is non-local, removing remote node entry\n", device->node_id ); + ipv4_node_delete ( card, device ); + return 0; + } + netdev = card->netdev; + if ( netdev ) { + fw_debug ( "Node %x is local: deleting netdev\n", device->node_id ); + priv = netdev_priv ( netdev ); + unregister_netdev ( netdev ); + fw_debug ( "unregistered\n" ); + if ( priv->local_fifo != INVALID_FIFO_ADDR ) + fw_core_remove_address_handler ( &priv->handler ); + fw_debug ( "address handler gone\n" ); + if ( priv->broadcast_rcv_context ) { + fw_iso_context_stop ( priv->broadcast_rcv_context ); + fw_iso_buffer_destroy ( &priv->broadcast_rcv_buffer, priv->card ); + fw_iso_context_destroy ( priv->broadcast_rcv_context ); + fw_debug ( "rcv stopped\n" ); + } + list_for_each_entry_safe( ptask, pt_next, &priv->packet_list, packet_list ) { + dev_kfree_skb_any ( ptask->skb ); + kmem_cache_free( ipv4_packet_task_cache, ptask ); + } + list_for_each_entry_safe( ptask, pt_next, &priv->broadcasted_list, packet_list ) { + dev_kfree_skb_any ( ptask->skb ); + kmem_cache_free( ipv4_packet_task_cache, ptask ); + } + list_for_each_entry_safe( ptask, pt_next, &priv->sent_list, packet_list ) { + dev_kfree_skb_any ( ptask->skb ); + kmem_cache_free( ipv4_packet_task_cache, ptask ); + } + fw_debug ( "lists emptied\n" ); + list_for_each_entry( node, &card->ipv4_nodes, ipv4_nodes ) { + if ( node->pdg_size ) { + list_for_each_entry_safe( pd, pd_next, &node->pdg_list, pdg_list ) + ipv4_pd_delete ( pd ); + node->pdg_size = 0; + } + node->fifo = INVALID_FIFO_ADDR; + } + fw_debug ( "nodes cleaned up\n" ); + free_netdev ( netdev ); + card->netdev = NULL; + fw_debug ( "done\n" ); + } + return 0; +} + +static void ipv4_update ( struct fw_unit *unit ) { + struct fw_device *device; + struct fw_card *card; + + fw_debug ( "ipv4_update unit %p\n", unit ); + device = fw_device ( unit->device.parent ); + card = device->card; + if ( ! device->is_local ) { + struct ipv4_node *node; + u64 guid; + struct net_device *netdev; + struct ipv4_priv *priv; + + netdev = card->netdev; + if ( netdev ) { + priv = netdev_priv ( netdev ); + guid = (u64)device->config_rom[3] << 32 | device->config_rom[4]; + node = ipv4_node_find_by_guid ( priv, guid ); + if ( ! node ) { + fw_error ( "ipv4_update: no node for device %llx\n", guid ); + return; + } + fw_debug ( "Non-local, updating remote node entry for guid %llx old generation %x, old nodeid %x\n", guid, node->generation, node->nodeid ); + node->generation = device->generation; + rmb(); + node->nodeid = device->node_id; + fw_debug ( "New generation %x, new nodeid %x\n", node->generation, node->nodeid ); + } else + fw_error ( "nonlocal, but no netdev? How can that be?\n" ); + } else { + /* FIXME: What do we need to do on bus reset? */ + fw_debug ( "Local, doing nothing\n" ); + } +} + +static struct fw_driver ipv4_driver = { + .driver = { + .owner = THIS_MODULE, + .name = ipv4_driver_name, + .bus = &fw_bus_type, + .probe = ipv4_probe, + .remove = ipv4_remove, + }, + .update = ipv4_update, + .id_table = ipv4_id_table, +}; + +static int __init ipv4_init ( void ) { + int added; + + added = fw_core_add_descriptor ( &ipv4_unit_directory ); + if ( added < 0 ) + fw_error ( "Failed to add descriptor" ); + ipv4_packet_task_cache = kmem_cache_create("packet_task", + sizeof(struct ipv4_packet_task), 0, 0, NULL); + fw_debug("Adding ipv4 module\n" ); + return driver_register ( &ipv4_driver.driver ); +} + +static void __exit ipv4_cleanup ( void ) { + fw_core_remove_descriptor ( &ipv4_unit_directory ); + fw_debug("Removing ipv4 module\n" ); + driver_unregister ( &ipv4_driver.driver ); +} + +module_init(ipv4_init); +module_exit(ipv4_cleanup); |