--- /dev/null
+/*
+ * IPv4 over IEEE 1394, per RFC 2734
+ * IPv6 over IEEE 1394, per RFC 3146
+ *
+ * Copyright (C) 2009 Jay Fenlason <fenlason@redhat.com>
+ *
+ * based on eth1394 by Ben Collins et al
+ */
+
+#include <linux/bug.h>
+#include <linux/compiler.h>
+#include <linux/delay.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/slab.h>
+#include <linux/spinlock.h>
+
+#include <asm/unaligned.h>
+#include <net/arp.h>
+#include <net/firewire.h>
+
+/* rx limits */
+#define FWNET_MAX_FRAGMENTS 30 /* arbitrary, > TX queue depth */
+#define FWNET_ISO_PAGE_COUNT (PAGE_SIZE < 16*1024 ? 4 : 2)
+
+/* tx limits */
+#define FWNET_MAX_QUEUED_DATAGRAMS 20 /* < 64 = number of tlabels */
+#define FWNET_MIN_QUEUED_DATAGRAMS 10 /* should keep AT DMA busy enough */
+#define FWNET_TX_QUEUE_LEN FWNET_MAX_QUEUED_DATAGRAMS /* ? */
+
+#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 RFC3146_SW_VERSION 0x000002U
+
+#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 */
+
+static bool fwnet_hwaddr_is_multicast(u8 *ha)
+{
+ return !!(*ha & 1);
+}
+
+/* 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;
+
+ /* Number of tx datagrams that have been queued but not yet acked */
+ int queued_datagrams;
+
+ int peer_count;
+ 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;
+
+ /* guarded by dev->lock */
+ struct list_head pd_list; /* received partial datagrams */
+ unsigned pdg_size; /* pd_list size */
+
+ u16 datagram_label; /* outgoing datagram label */
+ u16 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 {
+ struct fw_transaction transaction;
+ struct rfc2734_header hdr;
+ struct sk_buff *skb;
+ struct fwnet_device *dev;
+
+ int outstanding_pkts;
+ u64 fifo_addr;
+ u16 dest_node;
+ u16 max_payload;
+ u8 generation;
+ u8 speed;
+ u8 enqueued;
+};
+
+/*
+ * Get fifo address embedded in hwaddr
+ */
+static __u64 fwnet_hwaddr_fifo(union fwnet_hwaddr *ha)
+{
+ return (u64)get_unaligned_be16(&ha->uc.fifo_hi) << 32
+ | get_unaligned_be32(&ha->uc.fifo_lo);
+}
+
+/*
+ * 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_cache(const struct neighbour *neigh,
+ struct hh_cache *hh, __be16 type)
+{
+ struct net_device *net;
+ struct fwnet_header *h;
+
+ if (type == cpu_to_be16(ETH_P_802_3))
+ return -1;
+ net = neigh->dev;
+ h = (struct fwnet_header *)((u8 *)hh->hh_data + HH_DATA_OFF(sizeof(*h)));
+ h->h_proto = 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 + HH_DATA_OFF(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,
+ .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)
+ 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 + LL_RESERVED_SPACE(net));
+ if (new->skb == NULL)
+ goto fail_w_fi;
+
+ skb_reserve(new->skb, LL_RESERVED_SPACE(net));
+ 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:
+ 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 beginning 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 = clamp(max_rec, 8U, 11U); /* 512...4096 */
+
+ 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;
+ int status;
+ __be64 guid;
+
+ switch (ether_type) {
+ case ETH_P_ARP:
+ case ETH_P_IP:
+#if IS_ENABLED(CONFIG_IPV6)
+ case ETH_P_IPV6:
+#endif
+ break;
+ default:
+ goto err;
+ }
+
+ dev = netdev_priv(net);
+ /* Write metadata, and then pass to the receive level */
+ skb->dev = net;
+ skb->ip_summed = CHECKSUM_NONE;
+
+ /*
+ * Parse the encapsulation header. This actually does the job of
+ * converting to an ethernet-like pseudo frame header.
+ */
+ guid = cpu_to_be64(dev->card->guid);
+ if (dev_hard_header(skb, net, ether_type,
+ is_broadcast ? net->broadcast : net->dev_addr,
+ 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 (fwnet_hwaddr_is_multicast(eth->h_dest)) {
+ 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) >= ETH_P_802_3_MIN) {
+ 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;
+ }
+
+ return 0;
+
+ err:
+ net->stats.rx_errors++;
+ net->stats.rx_dropped++;
+
+ dev_kfree_skb_any(skb);
+
+ return -ENOENT;
+}
+
+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 + LL_RESERVED_SPACE(net));
+ if (unlikely(!skb)) {
+ net->stats.rx_dropped++;
+
+ return -ENOMEM;
+ }
+ skb_reserve(skb, LL_RESERVED_SPACE(net));
+ 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) {
+ retval = -ENOENT;
+ goto fail;
+ }
+
+ 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 fail;
+ }
+ 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) {
+ peer->pdg_size--;
+ retval = -ENOMEM;
+ goto fail;
+ }
+ } 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--;
+ retval = -ENOMEM;
+ goto fail;
+ }
+ }
+ } /* 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.
+ */
+ retval = 0;
+ fail:
+ spin_unlock_irqrestore(&dev->lock, flags);
+
+ return retval;
+}
+
+static void fwnet_receive_packet(struct fw_card *card, struct fw_request *r,
+ int tcode, int destination, int source, int generation,
+ 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) {
+ dev_err(&dev->netdev->dev, "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;
+ __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;
+ 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
+#if IS_ENABLED(CONFIG_IPV6)
+ || ver == RFC3146_SW_VERSION
+#endif
+ )) {
+ buf_ptr += 2;
+ length -= IEEE1394_GASP_HDR_SIZE;
+ fwnet_incoming_packet(dev, buf_ptr, length, source_node_id,
+ context->card->generation, 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_iso_context_queue_flush(dev->broadcast_rcv_context);
+ else
+ dev_err(&dev->netdev->dev, "requeue failed\n");
+}
+
+static struct kmem_cache *fwnet_packet_task_cache;
+
+static void fwnet_free_ptask(struct fwnet_packet_task *ptask)
+{
+ dev_kfree_skb_any(ptask->skb);
+ kmem_cache_free(fwnet_packet_task_cache, ptask);
+}
+
+/* Caller must hold dev->lock. */
+static void dec_queued_datagrams(struct fwnet_device *dev)
+{
+ if (--dev->queued_datagrams == FWNET_MIN_QUEUED_DATAGRAMS)
+ netif_wake_queue(dev->netdev);
+}
+
+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 = ptask->dev;
+ struct sk_buff *skb = ptask->skb;
+ unsigned long flags;
+ bool free;
+
+ spin_lock_irqsave(&dev->lock, flags);
+
+ ptask->outstanding_pkts--;
+
+ /* Check whether we or the networking TX soft-IRQ is last user. */
+ free = (ptask->outstanding_pkts == 0 && ptask->enqueued);
+ if (free)
+ dec_queued_datagrams(dev);
+
+ if (ptask->outstanding_pkts == 0) {
+ dev->netdev->stats.tx_packets++;
+ dev->netdev->stats.tx_bytes += skb->len;
+ }
+
+ spin_unlock_irqrestore(&dev->lock, flags);
+
+ if (ptask->outstanding_pkts > 0) {
+ u16 dg_size;
+ u16 fg_off;
+ u16 datagram_label;
+ u16 lf;
+
+ /* 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:
+ dev_err(&dev->netdev->dev,
+ "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;
+ }
+
+ if (ptask->dest_node == IEEE1394_ALL_NODES) {
+ skb_pull(skb,
+ ptask->max_payload + IEEE1394_GASP_HDR_SIZE);
+ } else {
+ 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);
+ }
+
+ if (free)
+ fwnet_free_ptask(ptask);
+}
+
+static void fwnet_transmit_packet_failed(struct fwnet_packet_task *ptask)
+{
+ struct fwnet_device *dev = ptask->dev;
+ unsigned long flags;
+ bool free;
+
+ spin_lock_irqsave(&dev->lock, flags);
+
+ /* One fragment failed; don't try to send remaining fragments. */
+ ptask->outstanding_pkts = 0;
+
+ /* Check whether we or the networking TX soft-IRQ is last user. */
+ free = ptask->enqueued;
+ if (free)
+ dec_queued_datagrams(dev);
+
+ dev->netdev->stats.tx_dropped++;
+ dev->netdev->stats.tx_errors++;
+
+ spin_unlock_irqrestore(&dev->lock, flags);
+
+ if (free)
+ fwnet_free_ptask(ptask);
+}
+
+static void fwnet_write_complete(struct fw_card *card, int rcode,
+ void *payload, size_t length, void *data)
+{
+ struct fwnet_packet_task *ptask = data;
+ static unsigned long j;
+ static int last_rcode, errors_skipped;
+
+ if (rcode == RCODE_COMPLETE) {
+ fwnet_transmit_packet_done(ptask);
+ } else {
+ if (printk_timed_ratelimit(&j, 1000) || rcode != last_rcode) {
+ dev_err(&ptask->dev->netdev->dev,
+ "fwnet_write_complete failed: %x (skipped %d)\n",
+ rcode, errors_skipped);
+
+ errors_skipped = 0;
+ last_rcode = rcode;
+ } else {
+ errors_skipped++;
+ }
+ fwnet_transmit_packet_failed(ptask);
+ }
+}
+
+static int fwnet_send_packet(struct fwnet_packet_task *ptask)
+{
+ struct fwnet_device *dev;
+ unsigned tx_len;
+ struct rfc2734_header *bufhdr;
+ unsigned long flags;
+ bool free;
+
+ 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;
+ unsigned int sw_version;
+
+ /* ptask->generation may not have been set yet */
+ generation = dev->card->generation;
+ smp_rmb();
+ node_id = dev->card->node_id;
+
+ switch (ptask->skb->protocol) {
+ default:
+ sw_version = RFC2734_SW_VERSION;
+ break;
+#if IS_ENABLED(CONFIG_IPV6)
+ case htons(ETH_P_IPV6):
+ sw_version = RFC3146_SW_VERSION;
+#endif
+ }
+
+ p = skb_push(ptask->skb, IEEE1394_GASP_HDR_SIZE);
+ put_unaligned_be32(node_id << 16 | IANA_SPECIFIER_ID >> 8, p);
+ put_unaligned_be32((IANA_SPECIFIER_ID & 0xff) << 24
+ | 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);
+
+ spin_lock_irqsave(&dev->lock, flags);
+
+ /* If the AT tasklet already ran, we may be last user. */
+ free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
+ if (!free)
+ ptask->enqueued = true;
+ else
+ dec_queued_datagrams(dev);
+
+ spin_unlock_irqrestore(&dev->lock, flags);
+
+ goto out;
+ }
+
+ 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);
+
+ spin_lock_irqsave(&dev->lock, flags);
+
+ /* If the AT tasklet already ran, we may be last user. */
+ free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
+ if (!free)
+ ptask->enqueued = true;
+ else
+ dec_queued_datagrams(dev);
+
+ spin_unlock_irqrestore(&dev->lock, flags);
+
+ dev->netdev->trans_start = jiffies;
+ out:
+ if (free)
+ fwnet_free_ptask(ptask);
+
+ return 0;
+}
+
+static void fwnet_fifo_stop(struct fwnet_device *dev)
+{
+ if (dev->local_fifo == FWNET_NO_FIFO_ADDR)
+ return;
+
+ fw_core_remove_address_handler(&dev->handler);
+ dev->local_fifo = FWNET_NO_FIFO_ADDR;
+}
+
+static int fwnet_fifo_start(struct fwnet_device *dev)
+{
+ int retval;
+
+ if (dev->local_fifo != FWNET_NO_FIFO_ADDR)
+ return 0;
+
+ dev->handler.length = 4096;
+ dev->handler.address_callback = fwnet_receive_packet;
+ dev->handler.callback_data = dev;
+
+ retval = fw_core_add_address_handler(&dev->handler,
+ &fw_high_memory_region);
+ if (retval < 0)
+ return retval;
+
+ dev->local_fifo = dev->handler.offset;
+
+ return 0;
+}
+
+static void __fwnet_broadcast_stop(struct fwnet_device *dev)
+{
+ unsigned u;
+
+ if (dev->broadcast_state != FWNET_BROADCAST_ERROR) {
+ for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++)
+ kunmap(dev->broadcast_rcv_buffer.pages[u]);
+ fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer, dev->card);
+ }
+ if (dev->broadcast_rcv_context) {
+ fw_iso_context_destroy(dev->broadcast_rcv_context);
+ dev->broadcast_rcv_context = NULL;
+ }
+ kfree(dev->broadcast_rcv_buffer_ptrs);
+ dev->broadcast_rcv_buffer_ptrs = NULL;
+ dev->broadcast_state = FWNET_BROADCAST_ERROR;
+}
+
+static void fwnet_broadcast_stop(struct fwnet_device *dev)
+{
+ if (dev->broadcast_state == FWNET_BROADCAST_ERROR)
+ return;
+ fw_iso_context_stop(dev->broadcast_rcv_context);
+ __fwnet_broadcast_stop(dev);
+}
+
+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;
+ void **ptrptr;
+ unsigned u;
+
+ if (dev->broadcast_state != FWNET_BROADCAST_ERROR)
+ return 0;
+
+ max_receive = 1U << (dev->card->max_receive + 1);
+ num_packets = (FWNET_ISO_PAGE_COUNT * PAGE_SIZE) / max_receive;
+
+ ptrptr = kmalloc(sizeof(void *) * num_packets, GFP_KERNEL);
+ if (!ptrptr) {
+ retval = -ENOMEM;
+ goto failed;
+ }
+ dev->broadcast_rcv_buffer_ptrs = 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;
+ }
+
+ retval = fw_iso_buffer_init(&dev->broadcast_rcv_buffer, dev->card,
+ FWNET_ISO_PAGE_COUNT, DMA_FROM_DEVICE);
+ if (retval < 0)
+ goto failed;
+
+ dev->broadcast_state = FWNET_BROADCAST_STOPPED;
+
+ 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;
+
+ 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;
+
+ 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;
+
+ /* 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:
+ __fwnet_broadcast_stop(dev);
+ return retval;
+}
+
+static void set_carrier_state(struct fwnet_device *dev)
+{
+ if (dev->peer_count > 1)
+ netif_carrier_on(dev->netdev);
+ else
+ netif_carrier_off(dev->netdev);
+}
+
+/* ifup */
+static int fwnet_open(struct net_device *net)
+{
+ struct fwnet_device *dev = netdev_priv(net);
+ int ret;
+
+ ret = fwnet_broadcast_start(dev);
+ if (ret)
+ return ret;
+
+ netif_start_queue(net);
+
+ spin_lock_irq(&dev->lock);
+ set_carrier_state(dev);
+ spin_unlock_irq(&dev->lock);
+
+ return 0;
+}
+
+/* ifdown */
+static int fwnet_stop(struct net_device *net)
+{
+ struct fwnet_device *dev = netdev_priv(net);
+
+ netif_stop_queue(net);
+ fwnet_broadcast_stop(dev);
+
+ return 0;
+}
+
+static netdev_tx_t 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;
+
+ spin_lock_irqsave(&dev->lock, flags);
+
+ /* Can this happen? */
+ if (netif_queue_stopped(dev->netdev)) {
+ spin_unlock_irqrestore(&dev->lock, flags);
+
+ return NETDEV_TX_BUSY;
+ }
+
+ 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));
+ proto = hdr_buf.h_proto;
+
+ switch (proto) {
+ case htons(ETH_P_ARP):
+ case htons(ETH_P_IP):
+#if IS_ENABLED(CONFIG_IPV6)
+ case htons(ETH_P_IPV6):
+#endif
+ break;
+ default:
+ goto fail;
+ }
+
+ skb_pull(skb, sizeof(hdr_buf));
+ dg_size = skb->len;
+
+ /*
+ * Set the transmission type for the packet. ARP packets and IP
+ * broadcast packets are sent via GASP.
+ */
+ if (fwnet_hwaddr_is_multicast(hdr_buf.h_dest)) {
+ 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 {
+ union fwnet_hwaddr *ha = (union fwnet_hwaddr *)hdr_buf.h_dest;
+ __be64 guid = get_unaligned(&ha->uc.uniq_id);
+ u8 generation;
+
+ peer = fwnet_peer_find_by_guid(dev, be64_to_cpu(guid));
+ if (!peer)
+ goto fail;
+
+ generation = peer->generation;
+ dest_node = peer->node_id;
+ max_payload = peer->max_payload;
+ datagram_label_ptr = &peer->datagram_label;
+
+ ptask->fifo_addr = fwnet_hwaddr_fifo(ha);
+ ptask->generation = generation;
+ ptask->dest_node = dest_node;
+ ptask->speed = peer->speed;
+ }
+
+ 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;
+ }
+
+ if (++dev->queued_datagrams == FWNET_MAX_QUEUED_DATAGRAMS)
+ netif_stop_queue(dev->netdev);
+
+ spin_unlock_irqrestore(&dev->lock, flags);
+
+ ptask->max_payload = max_payload;
+ ptask->enqueued = 0;
+
+ fwnet_send_packet(ptask);
+
+ return NETDEV_TX_OK;
+
+ fail:
+ spin_unlock_irqrestore(&dev->lock, flags);
+
+ 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 const struct ethtool_ops fwnet_ethtool_ops = {
+ .get_link = ethtool_op_get_link,
+};
+
+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 = FWNET_TX_QUEUE_LEN;
+ net->ethtool_ops = &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];
+ 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);
+ dev->peer_count++;
+ set_carrier_state(dev);
+ spin_unlock_irq(&dev->lock);
+
+ return 0;
+}
+
+static int fwnet_probe(struct fw_unit *unit,
+ const struct ieee1394_device_id *id)
+{
+ 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;
+ union fwnet_hwaddr *ha;
+
+ 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", NET_NAME_UNKNOWN,
+ fwnet_init_dev);
+ if (net == NULL) {
+ mutex_unlock(&fwnet_device_mutex);
+ return -ENOMEM;
+ }
+
+ 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;
+ dev->queued_datagrams = 0;
+ INIT_LIST_HEAD(&dev->peer_list);
+ dev->card = card;
+ dev->netdev = net;
+
+ ret = fwnet_fifo_start(dev);
+ if (ret < 0)
+ goto out;
+ dev->local_fifo = dev->handler.offset;
+
+ /*
+ * 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 */
+ ha = (union fwnet_hwaddr *)net->dev_addr;
+ put_unaligned_be64(card->guid, &ha->uc.uniq_id);
+ ha->uc.max_rec = dev->card->max_receive;
+ ha->uc.sspd = dev->card->link_speed;
+ put_unaligned_be16(dev->local_fifo >> 32, &ha->uc.fifo_hi);
+ put_unaligned_be32(dev->local_fifo & 0xffffffff, &ha->uc.fifo_lo);
+
+ memset(net->broadcast, -1, net->addr_len);
+
+ ret = register_netdev(net);
+ if (ret)
+ goto out;
+
+ list_add_tail(&dev->dev_link, &fwnet_device_list);
+ dev_notice(&net->dev, "IP over IEEE 1394 on card %s\n",
+ dev_name(card->device));
+ have_dev:
+ ret = fwnet_add_peer(dev, unit, device);
+ if (ret && allocated_netdev) {
+ unregister_netdev(net);
+ list_del(&dev->dev_link);
+ out:
+ fwnet_fifo_stop(dev);
+ free_netdev(net);
+ }
+
+ mutex_unlock(&fwnet_device_mutex);
+
+ return ret;
+}
+
+/*
+ * 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 void fwnet_remove_peer(struct fwnet_peer *peer, struct fwnet_device *dev)
+{
+ struct fwnet_partial_datagram *pd, *pd_next;
+
+ spin_lock_irq(&dev->lock);
+ list_del(&peer->peer_link);
+ dev->peer_count--;
+ set_carrier_state(dev);
+ spin_unlock_irq(&dev->lock);
+
+ list_for_each_entry_safe(pd, pd_next, &peer->pd_list, pd_link)
+ fwnet_pd_delete(pd);
+
+ kfree(peer);
+}
+
+static void fwnet_remove(struct fw_unit *unit)
+{
+ struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
+ struct fwnet_device *dev = peer->dev;
+ struct net_device *net;
+ int i;
+
+ mutex_lock(&fwnet_device_mutex);
+
+ net = dev->netdev;
+
+ fwnet_remove_peer(peer, dev);
+
+ if (list_empty(&dev->peer_list)) {
+ unregister_netdev(net);
+
+ fwnet_fifo_stop(dev);
+
+ for (i = 0; dev->queued_datagrams && i < 5; i++)
+ ssleep(1);
+ WARN_ON(dev->queued_datagrams);
+ list_del(&dev->dev_link);
+
+ free_netdev(net);
+ }
+
+ mutex_unlock(&fwnet_device_mutex);
+}
+
+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,
+ },
+#if IS_ENABLED(CONFIG_IPV6)
+ {
+ .match_flags = IEEE1394_MATCH_SPECIFIER_ID |
+ IEEE1394_MATCH_VERSION,
+ .specifier_id = IANA_SPECIFIER_ID,
+ .version = RFC3146_SW_VERSION,
+ },
+#endif
+ { }
+};
+
+static struct fw_driver fwnet_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = KBUILD_MODNAME,
+ .bus = &fw_bus_type,
+ },
+ .probe = fwnet_probe,
+ .update = fwnet_update,
+ .remove = fwnet_remove,
+ .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
+};
+
+#if IS_ENABLED(CONFIG_IPV6)
+static const u32 rfc3146_unit_directory_data[] = {
+ 0x00040000, /* directory_length */
+ 0x1200005e, /* unit_specifier_id: IANA */
+ 0x81000003, /* textual descriptor offset */
+ 0x13000002, /* unit_sw_version: RFC 3146 */
+ 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 */
+ 0x49507636, /* I P v 6 */
+};
+
+static struct fw_descriptor rfc3146_unit_directory = {
+ .length = ARRAY_SIZE(rfc3146_unit_directory_data),
+ .key = (CSR_DIRECTORY | CSR_UNIT) << 24,
+ .data = rfc3146_unit_directory_data
+};
+#endif
+
+static int __init fwnet_init(void)
+{
+ int err;
+
+ err = fw_core_add_descriptor(&rfc2374_unit_directory);
+ if (err)
+ return err;
+
+#if IS_ENABLED(CONFIG_IPV6)
+ err = fw_core_add_descriptor(&rfc3146_unit_directory);
+ if (err)
+ goto out;
+#endif
+
+ 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 out2;
+ }
+
+ err = driver_register(&fwnet_driver.driver);
+ if (!err)
+ return 0;
+
+ kmem_cache_destroy(fwnet_packet_task_cache);
+out2:
+#if IS_ENABLED(CONFIG_IPV6)
+ fw_core_remove_descriptor(&rfc3146_unit_directory);
+out:
+#endif
+ 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);
+#if IS_ENABLED(CONFIG_IPV6)
+ fw_core_remove_descriptor(&rfc3146_unit_directory);
+#endif
+ fw_core_remove_descriptor(&rfc2374_unit_directory);
+}
+module_exit(fwnet_cleanup);
+
+MODULE_AUTHOR("Jay Fenlason <fenlason@redhat.com>");
+MODULE_DESCRIPTION("IP over IEEE1394 as per RFC 2734/3146");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(ieee1394, fwnet_id_table);
Code Review / kvmfornfv.git / blobdiff