drivers/firewire/net.c

   1 /*
   2  * IPv4 over IEEE 1394, per RFC 2734
   3  *
   4  * Copyright (C) 2009 Jay Fenlason <fenlason@redhat.com>
   5  *
   6  * based on eth1394 by Ben Collins et al
   7  */
   8
   9 #include <linux/bug.h>
  10 #include <linux/compiler.h>
  11 #include <linux/delay.h>
  12 #include <linux/device.h>
  13 #include <linux/ethtool.h>
  14 #include <linux/firewire.h>
  15 #include <linux/firewire-constants.h>
  16 #include <linux/highmem.h>
  17 #include <linux/in.h>
  18 #include <linux/ip.h>
  19 #include <linux/jiffies.h>
  20 #include <linux/mod_devicetable.h>
  21 #include <linux/module.h>
  22 #include <linux/moduleparam.h>
  23 #include <linux/mutex.h>
  24 #include <linux/netdevice.h>
  25 #include <linux/skbuff.h>
  26 #include <linux/slab.h>
  27 #include <linux/spinlock.h>
  28
  29 #include <asm/unaligned.h>
  30 #include <net/arp.h>
  31
  32 /* rx limits */
  33 #define FWNET_MAX_FRAGMENTS             30 /* arbitrary, > TX queue depth */
  34 #define FWNET_ISO_PAGE_COUNT            (PAGE_SIZE < 16*1024 ? 4 : 2)
  35
  36 /* tx limits */
  37 #define FWNET_MAX_QUEUED_DATAGRAMS      20 /* < 64 = number of tlabels */
  38 #define FWNET_MIN_QUEUED_DATAGRAMS      10 /* should keep AT DMA busy enough */
  39 #define FWNET_TX_QUEUE_LEN              FWNET_MAX_QUEUED_DATAGRAMS /* ? */
  40
  41 #define IEEE1394_BROADCAST_CHANNEL      31
  42 #define IEEE1394_ALL_NODES              (0xffc0 | 0x003f)
  43 #define IEEE1394_MAX_PAYLOAD_S100       512
  44 #define FWNET_NO_FIFO_ADDR              (~0ULL)
  45
  46 #define IANA_SPECIFIER_ID               0x00005eU
  47 #define RFC2734_SW_VERSION              0x000001U
  48
  49 #define IEEE1394_GASP_HDR_SIZE  8
  50
  51 #define RFC2374_UNFRAG_HDR_SIZE 4
  52 #define RFC2374_FRAG_HDR_SIZE   8
  53 #define RFC2374_FRAG_OVERHEAD   4
  54
  55 #define RFC2374_HDR_UNFRAG      0       /* unfragmented         */
  56 #define RFC2374_HDR_FIRSTFRAG   1       /* first fragment       */
  57 #define RFC2374_HDR_LASTFRAG    2       /* last fragment        */
  58 #define RFC2374_HDR_INTFRAG     3       /* interior fragment    */
  59
  60 #define RFC2734_HW_ADDR_LEN     16
  61
  62 struct rfc2734_arp {
  63         __be16 hw_type;         /* 0x0018       */
  64         __be16 proto_type;      /* 0x0806       */
  65         u8 hw_addr_len;         /* 16           */
  66         u8 ip_addr_len;         /* 4            */
  67         __be16 opcode;          /* ARP Opcode   */
  68         /* Above is exactly the same format as struct arphdr */
  69
  70         __be64 s_uniq_id;       /* Sender's 64bit EUI                   */
  71         u8 max_rec;             /* Sender's max packet size             */
  72         u8 sspd;                /* Sender's max speed                   */
  73         __be16 fifo_hi;         /* hi 16bits of sender's FIFO addr      */
  74         __be32 fifo_lo;         /* lo 32bits of sender's FIFO addr      */
  75         __be32 sip;             /* Sender's IP Address                  */
  76         __be32 tip;             /* IP Address of requested hw addr      */
  77 } __packed;
  78
  79 /* This header format is specific to this driver implementation. */
  80 #define FWNET_ALEN      8
  81 #define FWNET_HLEN      10
  82 struct fwnet_header {
  83         u8 h_dest[FWNET_ALEN];  /* destination address */
  84         __be16 h_proto;         /* packet type ID field */
  85 } __packed;
  86
  87 /* IPv4 and IPv6 encapsulation header */
  88 struct rfc2734_header {
  89         u32 w0;
  90         u32 w1;
  91 };
  92
  93 #define fwnet_get_hdr_lf(h)             (((h)->w0 & 0xc0000000) >> 30)
  94 #define fwnet_get_hdr_ether_type(h)     (((h)->w0 & 0x0000ffff))
  95 #define fwnet_get_hdr_dg_size(h)        (((h)->w0 & 0x0fff0000) >> 16)
  96 #define fwnet_get_hdr_fg_off(h)         (((h)->w0 & 0x00000fff))
  97 #define fwnet_get_hdr_dgl(h)            (((h)->w1 & 0xffff0000) >> 16)
  98
  99 #define fwnet_set_hdr_lf(lf)            ((lf)  << 30)
 100 #define fwnet_set_hdr_ether_type(et)    (et)
 101 #define fwnet_set_hdr_dg_size(dgs)      ((dgs) << 16)
 102 #define fwnet_set_hdr_fg_off(fgo)       (fgo)
 103
 104 #define fwnet_set_hdr_dgl(dgl)          ((dgl) << 16)
 105
 106 static inline void fwnet_make_uf_hdr(struct rfc2734_header *hdr,
 107                 unsigned ether_type)
 108 {
 109         hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_UNFRAG)
 110                   | fwnet_set_hdr_ether_type(ether_type);
 111 }
 112
 113 static inline void fwnet_make_ff_hdr(struct rfc2734_header *hdr,
 114                 unsigned ether_type, unsigned dg_size, unsigned dgl)
 115 {
 116         hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_FIRSTFRAG)
 117                   | fwnet_set_hdr_dg_size(dg_size)
 118                   | fwnet_set_hdr_ether_type(ether_type);
 119         hdr->w1 = fwnet_set_hdr_dgl(dgl);
 120 }
 121
 122 static inline void fwnet_make_sf_hdr(struct rfc2734_header *hdr,
 123                 unsigned lf, unsigned dg_size, unsigned fg_off, unsigned dgl)
 124 {
 125         hdr->w0 = fwnet_set_hdr_lf(lf)
 126                   | fwnet_set_hdr_dg_size(dg_size)
 127                   | fwnet_set_hdr_fg_off(fg_off);
 128         hdr->w1 = fwnet_set_hdr_dgl(dgl);
 129 }
 130
 131 /* This list keeps track of what parts of the datagram have been filled in */
 132 struct fwnet_fragment_info {
 133         struct list_head fi_link;
 134         u16 offset;
 135         u16 len;
 136 };
 137
 138 struct fwnet_partial_datagram {
 139         struct list_head pd_link;
 140         struct list_head fi_list;
 141         struct sk_buff *skb;
 142         /* FIXME Why not use skb->data? */
 143         char *pbuf;
 144         u16 datagram_label;
 145         u16 ether_type;
 146         u16 datagram_size;
 147 };
 148
 149 static DEFINE_MUTEX(fwnet_device_mutex);
 150 static LIST_HEAD(fwnet_device_list);
 151
 152 struct fwnet_device {
 153         struct list_head dev_link;
 154         spinlock_t lock;
 155         enum {
 156                 FWNET_BROADCAST_ERROR,
 157                 FWNET_BROADCAST_RUNNING,
 158                 FWNET_BROADCAST_STOPPED,
 159         } broadcast_state;
 160         struct fw_iso_context *broadcast_rcv_context;
 161         struct fw_iso_buffer broadcast_rcv_buffer;
 162         void **broadcast_rcv_buffer_ptrs;
 163         unsigned broadcast_rcv_next_ptr;
 164         unsigned num_broadcast_rcv_ptrs;
 165         unsigned rcv_buffer_size;
 166         /*
 167          * This value is the maximum unfragmented datagram size that can be
 168          * sent by the hardware.  It already has the GASP overhead and the
 169          * unfragmented datagram header overhead calculated into it.
 170          */
 171         unsigned broadcast_xmt_max_payload;
 172         u16 broadcast_xmt_datagramlabel;
 173
 174         /*
 175          * The CSR address that remote nodes must send datagrams to for us to
 176          * receive them.
 177          */
 178         struct fw_address_handler handler;
 179         u64 local_fifo;
 180
 181         /* Number of tx datagrams that have been queued but not yet acked */
 182         int queued_datagrams;
 183
 184         int peer_count;
 185         struct list_head peer_list;
 186         struct fw_card *card;
 187         struct net_device *netdev;
 188 };
 189
 190 struct fwnet_peer {
 191         struct list_head peer_link;
 192         struct fwnet_device *dev;
 193         u64 guid;
 194         u64 fifo;
 195         __be32 ip;
 196
 197         /* guarded by dev->lock */
 198         struct list_head pd_list; /* received partial datagrams */
 199         unsigned pdg_size;        /* pd_list size */
 200
 201         u16 datagram_label;       /* outgoing datagram label */
 202         u16 max_payload;          /* includes RFC2374_FRAG_HDR_SIZE overhead */
 203         int node_id;
 204         int generation;
 205         unsigned speed;
 206 };
 207
 208 /* This is our task struct. It's used for the packet complete callback.  */
 209 struct fwnet_packet_task {
 210         struct fw_transaction transaction;
 211         struct rfc2734_header hdr;
 212         struct sk_buff *skb;
 213         struct fwnet_device *dev;
 214
 215         int outstanding_pkts;
 216         u64 fifo_addr;
 217         u16 dest_node;
 218         u16 max_payload;
 219         u8 generation;
 220         u8 speed;
 221         u8 enqueued;
 222 };
 223
 224 /*
 225  * saddr == NULL means use device source address.
 226  * daddr == NULL means leave destination address (eg unresolved arp).
 227  */
 228 static int fwnet_header_create(struct sk_buff *skb, struct net_device *net,
 229                         unsigned short type, const void *daddr,
 230                         const void *saddr, unsigned len)
 231 {
 232         struct fwnet_header *h;
 233
 234         h = (struct fwnet_header *)skb_push(skb, sizeof(*h));
 235         put_unaligned_be16(type, &h->h_proto);
 236
 237         if (net->flags & (IFF_LOOPBACK | IFF_NOARP)) {
 238                 memset(h->h_dest, 0, net->addr_len);
 239
 240                 return net->hard_header_len;
 241         }
 242
 243         if (daddr) {
 244                 memcpy(h->h_dest, daddr, net->addr_len);
 245
 246                 return net->hard_header_len;
 247         }
 248
 249         return -net->hard_header_len;
 250 }
 251
 252 static int fwnet_header_rebuild(struct sk_buff *skb)
 253 {
 254         struct fwnet_header *h = (struct fwnet_header *)skb->data;
 255
 256         if (get_unaligned_be16(&h->h_proto) == ETH_P_IP)
 257                 return arp_find((unsigned char *)&h->h_dest, skb);
 258
 259         dev_notice(&skb->dev->dev, "unable to resolve type %04x addresses\n",
 260                    be16_to_cpu(h->h_proto));
 261         return 0;
 262 }
 263
 264 static int fwnet_header_cache(const struct neighbour *neigh,
 265                               struct hh_cache *hh, __be16 type)
 266 {
 267         struct net_device *net;
 268         struct fwnet_header *h;
 269
 270         if (type == cpu_to_be16(ETH_P_802_3))
 271                 return -1;
 272         net = neigh->dev;
 273         h = (struct fwnet_header *)((u8 *)hh->hh_data + HH_DATA_OFF(sizeof(*h)));
 274         h->h_proto = type;
 275         memcpy(h->h_dest, neigh->ha, net->addr_len);
 276         hh->hh_len = FWNET_HLEN;
 277
 278         return 0;
 279 }
 280
 281 /* Called by Address Resolution module to notify changes in address. */
 282 static void fwnet_header_cache_update(struct hh_cache *hh,
 283                 const struct net_device *net, const unsigned char *haddr)
 284 {
 285         memcpy((u8 *)hh->hh_data + HH_DATA_OFF(FWNET_HLEN), haddr, net->addr_len);
 286 }
 287
 288 static int fwnet_header_parse(const struct sk_buff *skb, unsigned char *haddr)
 289 {
 290         memcpy(haddr, skb->dev->dev_addr, FWNET_ALEN);
 291
 292         return FWNET_ALEN;
 293 }
 294
 295 static const struct header_ops fwnet_header_ops = {
 296         .create         = fwnet_header_create,
 297         .rebuild        = fwnet_header_rebuild,
 298         .cache          = fwnet_header_cache,
 299         .cache_update   = fwnet_header_cache_update,
 300         .parse          = fwnet_header_parse,
 301 };
 302
 303 /* FIXME: is this correct for all cases? */
 304 static bool fwnet_frag_overlap(struct fwnet_partial_datagram *pd,
 305                                unsigned offset, unsigned len)
 306 {
 307         struct fwnet_fragment_info *fi;
 308         unsigned end = offset + len;
 309
 310         list_for_each_entry(fi, &pd->fi_list, fi_link)
 311                 if (offset < fi->offset + fi->len && end > fi->offset)
 312                         return true;
 313
 314         return false;
 315 }
 316
 317 /* Assumes that new fragment does not overlap any existing fragments */
 318 static struct fwnet_fragment_info *fwnet_frag_new(
 319         struct fwnet_partial_datagram *pd, unsigned offset, unsigned len)
 320 {
 321         struct fwnet_fragment_info *fi, *fi2, *new;
 322         struct list_head *list;
 323
 324         list = &pd->fi_list;
 325         list_for_each_entry(fi, &pd->fi_list, fi_link) {
 326                 if (fi->offset + fi->len == offset) {
 327                         /* The new fragment can be tacked on to the end */
 328                         /* Did the new fragment plug a hole? */
 329                         fi2 = list_entry(fi->fi_link.next,
 330                                          struct fwnet_fragment_info, fi_link);
 331                         if (fi->offset + fi->len == fi2->offset) {
 332                                 /* glue fragments together */
 333                                 fi->len += len + fi2->len;
 334                                 list_del(&fi2->fi_link);
 335                                 kfree(fi2);
 336                         } else {
 337                                 fi->len += len;
 338                         }
 339
 340                         return fi;
 341                 }
 342                 if (offset + len == fi->offset) {
 343                         /* The new fragment can be tacked on to the beginning */
 344                         /* Did the new fragment plug a hole? */
 345                         fi2 = list_entry(fi->fi_link.prev,
 346                                          struct fwnet_fragment_info, fi_link);
 347                         if (fi2->offset + fi2->len == fi->offset) {
 348                                 /* glue fragments together */
 349                                 fi2->len += fi->len + len;
 350                                 list_del(&fi->fi_link);
 351                                 kfree(fi);
 352
 353                                 return fi2;
 354                         }
 355                         fi->offset = offset;
 356                         fi->len += len;
 357
 358                         return fi;
 359                 }
 360                 if (offset > fi->offset + fi->len) {
 361                         list = &fi->fi_link;
 362                         break;
 363                 }
 364                 if (offset + len < fi->offset) {
 365                         list = fi->fi_link.prev;
 366                         break;
 367                 }
 368         }
 369
 370         new = kmalloc(sizeof(*new), GFP_ATOMIC);
 371         if (!new) {
 372                 dev_err(&pd->skb->dev->dev, "out of memory\n");
 373                 return NULL;
 374         }
 375
 376         new->offset = offset;
 377         new->len = len;
 378         list_add(&new->fi_link, list);
 379
 380         return new;
 381 }
 382
 383 static struct fwnet_partial_datagram *fwnet_pd_new(struct net_device *net,
 384                 struct fwnet_peer *peer, u16 datagram_label, unsigned dg_size,
 385                 void *frag_buf, unsigned frag_off, unsigned frag_len)
 386 {
 387         struct fwnet_partial_datagram *new;
 388         struct fwnet_fragment_info *fi;
 389
 390         new = kmalloc(sizeof(*new), GFP_ATOMIC);
 391         if (!new)
 392                 goto fail;
 393
 394         INIT_LIST_HEAD(&new->fi_list);
 395         fi = fwnet_frag_new(new, frag_off, frag_len);
 396         if (fi == NULL)
 397                 goto fail_w_new;
 398
 399         new->datagram_label = datagram_label;
 400         new->datagram_size = dg_size;
 401         new->skb = dev_alloc_skb(dg_size + LL_RESERVED_SPACE(net));
 402         if (new->skb == NULL)
 403                 goto fail_w_fi;
 404
 405         skb_reserve(new->skb, LL_RESERVED_SPACE(net));
 406         new->pbuf = skb_put(new->skb, dg_size);
 407         memcpy(new->pbuf + frag_off, frag_buf, frag_len);
 408         list_add_tail(&new->pd_link, &peer->pd_list);
 409
 410         return new;
 411
 412 fail_w_fi:
 413         kfree(fi);
 414 fail_w_new:
 415         kfree(new);
 416 fail:
 417         dev_err(&net->dev, "out of memory\n");
 418
 419         return NULL;
 420 }
 421
 422 static struct fwnet_partial_datagram *fwnet_pd_find(struct fwnet_peer *peer,
 423                                                     u16 datagram_label)
 424 {
 425         struct fwnet_partial_datagram *pd;
 426
 427         list_for_each_entry(pd, &peer->pd_list, pd_link)
 428                 if (pd->datagram_label == datagram_label)
 429                         return pd;
 430
 431         return NULL;
 432 }
 433
 434
 435 static void fwnet_pd_delete(struct fwnet_partial_datagram *old)
 436 {
 437         struct fwnet_fragment_info *fi, *n;
 438
 439         list_for_each_entry_safe(fi, n, &old->fi_list, fi_link)
 440                 kfree(fi);
 441
 442         list_del(&old->pd_link);
 443         dev_kfree_skb_any(old->skb);
 444         kfree(old);
 445 }
 446
 447 static bool fwnet_pd_update(struct fwnet_peer *peer,
 448                 struct fwnet_partial_datagram *pd, void *frag_buf,
 449                 unsigned frag_off, unsigned frag_len)
 450 {
 451         if (fwnet_frag_new(pd, frag_off, frag_len) == NULL)
 452                 return false;
 453
 454         memcpy(pd->pbuf + frag_off, frag_buf, frag_len);
 455
 456         /*
 457          * Move list entry to beginning of list so that oldest partial
 458          * datagrams percolate to the end of the list
 459          */
 460         list_move_tail(&pd->pd_link, &peer->pd_list);
 461
 462         return true;
 463 }
 464
 465 static bool fwnet_pd_is_complete(struct fwnet_partial_datagram *pd)
 466 {
 467         struct fwnet_fragment_info *fi;
 468
 469         fi = list_entry(pd->fi_list.next, struct fwnet_fragment_info, fi_link);
 470
 471         return fi->len == pd->datagram_size;
 472 }
 473
 474 /* caller must hold dev->lock */
 475 static struct fwnet_peer *fwnet_peer_find_by_guid(struct fwnet_device *dev,
 476                                                   u64 guid)
 477 {
 478         struct fwnet_peer *peer;
 479
 480         list_for_each_entry(peer, &dev->peer_list, peer_link)
 481                 if (peer->guid == guid)
 482                         return peer;
 483
 484         return NULL;
 485 }
 486
 487 /* caller must hold dev->lock */
 488 static struct fwnet_peer *fwnet_peer_find_by_node_id(struct fwnet_device *dev,
 489                                                 int node_id, int generation)
 490 {
 491         struct fwnet_peer *peer;
 492
 493         list_for_each_entry(peer, &dev->peer_list, peer_link)
 494                 if (peer->node_id    == node_id &&
 495                     peer->generation == generation)
 496                         return peer;
 497
 498         return NULL;
 499 }
 500
 501 /* See IEEE 1394-2008 table 6-4, table 8-8, table 16-18. */
 502 static unsigned fwnet_max_payload(unsigned max_rec, unsigned speed)
 503 {
 504         max_rec = min(max_rec, speed + 8);
 505         max_rec = clamp(max_rec, 8U, 11U); /* 512...4096 */
 506
 507         return (1 << (max_rec + 1)) - RFC2374_FRAG_HDR_SIZE;
 508 }
 509
 510
 511 static int fwnet_finish_incoming_packet(struct net_device *net,
 512                                         struct sk_buff *skb, u16 source_node_id,
 513                                         bool is_broadcast, u16 ether_type)
 514 {
 515         struct fwnet_device *dev;
 516         static const __be64 broadcast_hw = cpu_to_be64(~0ULL);
 517         int status;
 518         __be64 guid;
 519
 520         dev = netdev_priv(net);
 521         /* Write metadata, and then pass to the receive level */
 522         skb->dev = net;
 523         skb->ip_summed = CHECKSUM_NONE;
 524
 525         /*
 526          * Parse the encapsulation header. This actually does the job of
 527          * converting to an ethernet frame header, as well as arp
 528          * conversion if needed. ARP conversion is easier in this
 529          * direction, since we are using ethernet as our backend.
 530          */
 531         /*
 532          * If this is an ARP packet, convert it. First, we want to make
 533          * use of some of the fields, since they tell us a little bit
 534          * about the sending machine.
 535          */
 536         if (ether_type == ETH_P_ARP) {
 537                 struct rfc2734_arp *arp1394;
 538                 struct arphdr *arp;
 539                 unsigned char *arp_ptr;
 540                 u64 fifo_addr;
 541                 u64 peer_guid;
 542                 unsigned sspd;
 543                 u16 max_payload;
 544                 struct fwnet_peer *peer;
 545                 unsigned long flags;
 546
 547                 arp1394   = (struct rfc2734_arp *)skb->data;
 548                 arp       = (struct arphdr *)skb->data;
 549                 arp_ptr   = (unsigned char *)(arp + 1);
 550                 peer_guid = get_unaligned_be64(&arp1394->s_uniq_id);
 551                 fifo_addr = (u64)get_unaligned_be16(&arp1394->fifo_hi) << 32
 552                                 | get_unaligned_be32(&arp1394->fifo_lo);
 553
 554                 sspd = arp1394->sspd;
 555                 /* Sanity check.  OS X 10.3 PPC reportedly sends 131. */
 556                 if (sspd > SCODE_3200) {
 557                         dev_notice(&net->dev, "sspd %x out of range\n", sspd);
 558                         sspd = SCODE_3200;
 559                 }
 560                 max_payload = fwnet_max_payload(arp1394->max_rec, sspd);
 561
 562                 spin_lock_irqsave(&dev->lock, flags);
 563                 peer = fwnet_peer_find_by_guid(dev, peer_guid);
 564                 if (peer) {
 565                         peer->fifo = fifo_addr;
 566
 567                         if (peer->speed > sspd)
 568                                 peer->speed = sspd;
 569                         if (peer->max_payload > max_payload)
 570                                 peer->max_payload = max_payload;
 571
 572                         peer->ip = arp1394->sip;
 573                 }
 574                 spin_unlock_irqrestore(&dev->lock, flags);
 575
 576                 if (!peer) {
 577                         dev_notice(&net->dev,
 578                                    "no peer for ARP packet from %016llx\n",
 579                                    (unsigned long long)peer_guid);
 580                         goto no_peer;
 581                 }
 582
 583                 /*
 584                  * Now that we're done with the 1394 specific stuff, we'll
 585                  * need to alter some of the data.  Believe it or not, all
 586                  * that needs to be done is sender_IP_address needs to be
 587                  * moved, the destination hardware address get stuffed
 588                  * in and the hardware address length set to 8.
 589                  *
 590                  * IMPORTANT: The code below overwrites 1394 specific data
 591                  * needed above so keep the munging of the data for the
 592                  * higher level IP stack last.
 593                  */
 594
 595                 arp->ar_hln = 8;
 596                 /* skip over sender unique id */
 597                 arp_ptr += arp->ar_hln;
 598                 /* move sender IP addr */
 599                 put_unaligned(arp1394->sip, (u32 *)arp_ptr);
 600                 /* skip over sender IP addr */
 601                 arp_ptr += arp->ar_pln;
 602
 603                 if (arp->ar_op == htons(ARPOP_REQUEST))
 604                         memset(arp_ptr, 0, sizeof(u64));
 605                 else
 606                         memcpy(arp_ptr, net->dev_addr, sizeof(u64));
 607         }
 608
 609         /* Now add the ethernet header. */
 610         guid = cpu_to_be64(dev->card->guid);
 611         if (dev_hard_header(skb, net, ether_type,
 612                            is_broadcast ? &broadcast_hw : &guid,
 613                            NULL, skb->len) >= 0) {
 614                 struct fwnet_header *eth;
 615                 u16 *rawp;
 616                 __be16 protocol;
 617
 618                 skb_reset_mac_header(skb);
 619                 skb_pull(skb, sizeof(*eth));
 620                 eth = (struct fwnet_header *)skb_mac_header(skb);
 621                 if (*eth->h_dest & 1) {
 622                         if (memcmp(eth->h_dest, net->broadcast,
 623                                    net->addr_len) == 0)
 624                                 skb->pkt_type = PACKET_BROADCAST;
 625 #if 0
 626                         else
 627                                 skb->pkt_type = PACKET_MULTICAST;
 628 #endif
 629                 } else {
 630                         if (memcmp(eth->h_dest, net->dev_addr, net->addr_len))
 631                                 skb->pkt_type = PACKET_OTHERHOST;
 632                 }
 633                 if (ntohs(eth->h_proto) >= 1536) {
 634                         protocol = eth->h_proto;
 635                 } else {
 636                         rawp = (u16 *)skb->data;
 637                         if (*rawp == 0xffff)
 638                                 protocol = htons(ETH_P_802_3);
 639                         else
 640                                 protocol = htons(ETH_P_802_2);
 641                 }
 642                 skb->protocol = protocol;
 643         }
 644         status = netif_rx(skb);
 645         if (status == NET_RX_DROP) {
 646                 net->stats.rx_errors++;
 647                 net->stats.rx_dropped++;
 648         } else {
 649                 net->stats.rx_packets++;
 650                 net->stats.rx_bytes += skb->len;
 651         }
 652
 653         return 0;
 654
 655  no_peer:
 656         net->stats.rx_errors++;
 657         net->stats.rx_dropped++;
 658
 659         dev_kfree_skb_any(skb);
 660
 661         return -ENOENT;
 662 }
 663
 664 static int fwnet_incoming_packet(struct fwnet_device *dev, __be32 *buf, int len,
 665                                  int source_node_id, int generation,
 666                                  bool is_broadcast)
 667 {
 668         struct sk_buff *skb;
 669         struct net_device *net = dev->netdev;
 670         struct rfc2734_header hdr;
 671         unsigned lf;
 672         unsigned long flags;
 673         struct fwnet_peer *peer;
 674         struct fwnet_partial_datagram *pd;
 675         int fg_off;
 676         int dg_size;
 677         u16 datagram_label;
 678         int retval;
 679         u16 ether_type;
 680
 681         hdr.w0 = be32_to_cpu(buf[0]);
 682         lf = fwnet_get_hdr_lf(&hdr);
 683         if (lf == RFC2374_HDR_UNFRAG) {
 684                 /*
 685                  * An unfragmented datagram has been received by the ieee1394
 686                  * bus. Build an skbuff around it so we can pass it to the
 687                  * high level network layer.
 688                  */
 689                 ether_type = fwnet_get_hdr_ether_type(&hdr);
 690                 buf++;
 691                 len -= RFC2374_UNFRAG_HDR_SIZE;
 692
 693                 skb = dev_alloc_skb(len + LL_RESERVED_SPACE(net));
 694                 if (unlikely(!skb)) {
 695                         dev_err(&net->dev, "out of memory\n");
 696                         net->stats.rx_dropped++;
 697
 698                         return -ENOMEM;
 699                 }
 700                 skb_reserve(skb, LL_RESERVED_SPACE(net));
 701                 memcpy(skb_put(skb, len), buf, len);
 702
 703                 return fwnet_finish_incoming_packet(net, skb, source_node_id,
 704                                                     is_broadcast, ether_type);
 705         }
 706         /* A datagram fragment has been received, now the fun begins. */
 707         hdr.w1 = ntohl(buf[1]);
 708         buf += 2;
 709         len -= RFC2374_FRAG_HDR_SIZE;
 710         if (lf == RFC2374_HDR_FIRSTFRAG) {
 711                 ether_type = fwnet_get_hdr_ether_type(&hdr);
 712                 fg_off = 0;
 713         } else {
 714                 ether_type = 0;
 715                 fg_off = fwnet_get_hdr_fg_off(&hdr);
 716         }
 717         datagram_label = fwnet_get_hdr_dgl(&hdr);
 718         dg_size = fwnet_get_hdr_dg_size(&hdr); /* ??? + 1 */
 719
 720         spin_lock_irqsave(&dev->lock, flags);
 721
 722         peer = fwnet_peer_find_by_node_id(dev, source_node_id, generation);
 723         if (!peer) {
 724                 retval = -ENOENT;
 725                 goto fail;
 726         }
 727
 728         pd = fwnet_pd_find(peer, datagram_label);
 729         if (pd == NULL) {
 730                 while (peer->pdg_size >= FWNET_MAX_FRAGMENTS) {
 731                         /* remove the oldest */
 732                         fwnet_pd_delete(list_first_entry(&peer->pd_list,
 733                                 struct fwnet_partial_datagram, pd_link));
 734                         peer->pdg_size--;
 735                 }
 736                 pd = fwnet_pd_new(net, peer, datagram_label,
 737                                   dg_size, buf, fg_off, len);
 738                 if (pd == NULL) {
 739                         retval = -ENOMEM;
 740                         goto fail;
 741                 }
 742                 peer->pdg_size++;
 743         } else {
 744                 if (fwnet_frag_overlap(pd, fg_off, len) ||
 745                     pd->datagram_size != dg_size) {
 746                         /*
 747                          * Differing datagram sizes or overlapping fragments,
 748                          * discard old datagram and start a new one.
 749                          */
 750                         fwnet_pd_delete(pd);
 751                         pd = fwnet_pd_new(net, peer, datagram_label,
 752                                           dg_size, buf, fg_off, len);
 753                         if (pd == NULL) {
 754                                 peer->pdg_size--;
 755                                 retval = -ENOMEM;
 756                                 goto fail;
 757                         }
 758                 } else {
 759                         if (!fwnet_pd_update(peer, pd, buf, fg_off, len)) {
 760                                 /*
 761                                  * Couldn't save off fragment anyway
 762                                  * so might as well obliterate the
 763                                  * datagram now.
 764                                  */
 765                                 fwnet_pd_delete(pd);
 766                                 peer->pdg_size--;
 767                                 retval = -ENOMEM;
 768                                 goto fail;
 769                         }
 770                 }
 771         } /* new datagram or add to existing one */
 772
 773         if (lf == RFC2374_HDR_FIRSTFRAG)
 774                 pd->ether_type = ether_type;
 775
 776         if (fwnet_pd_is_complete(pd)) {
 777                 ether_type = pd->ether_type;
 778                 peer->pdg_size--;
 779                 skb = skb_get(pd->skb);
 780                 fwnet_pd_delete(pd);
 781
 782                 spin_unlock_irqrestore(&dev->lock, flags);
 783
 784                 return fwnet_finish_incoming_packet(net, skb, source_node_id,
 785                                                     false, ether_type);
 786         }
 787         /*
 788          * Datagram is not complete, we're done for the
 789          * moment.
 790          */
 791         retval = 0;
 792  fail:
 793         spin_unlock_irqrestore(&dev->lock, flags);
 794
 795         return retval;
 796 }
 797
 798 static void fwnet_receive_packet(struct fw_card *card, struct fw_request *r,
 799                 int tcode, int destination, int source, int generation,
 800                 unsigned long long offset, void *payload, size_t length,
 801                 void *callback_data)
 802 {
 803         struct fwnet_device *dev = callback_data;
 804         int rcode;
 805
 806         if (destination == IEEE1394_ALL_NODES) {
 807                 kfree(r);
 808
 809                 return;
 810         }
 811
 812         if (offset != dev->handler.offset)
 813                 rcode = RCODE_ADDRESS_ERROR;
 814         else if (tcode != TCODE_WRITE_BLOCK_REQUEST)
 815                 rcode = RCODE_TYPE_ERROR;
 816         else if (fwnet_incoming_packet(dev, payload, length,
 817                                        source, generation, false) != 0) {
 818                 dev_err(&dev->netdev->dev, "incoming packet failure\n");
 819                 rcode = RCODE_CONFLICT_ERROR;
 820         } else
 821                 rcode = RCODE_COMPLETE;
 822
 823         fw_send_response(card, r, rcode);
 824 }
 825
 826 static void fwnet_receive_broadcast(struct fw_iso_context *context,
 827                 u32 cycle, size_t header_length, void *header, void *data)
 828 {
 829         struct fwnet_device *dev;
 830         struct fw_iso_packet packet;
 831         __be16 *hdr_ptr;
 832         __be32 *buf_ptr;
 833         int retval;
 834         u32 length;
 835         u16 source_node_id;
 836         u32 specifier_id;
 837         u32 ver;
 838         unsigned long offset;
 839         unsigned long flags;
 840
 841         dev = data;
 842         hdr_ptr = header;
 843         length = be16_to_cpup(hdr_ptr);
 844
 845         spin_lock_irqsave(&dev->lock, flags);
 846
 847         offset = dev->rcv_buffer_size * dev->broadcast_rcv_next_ptr;
 848         buf_ptr = dev->broadcast_rcv_buffer_ptrs[dev->broadcast_rcv_next_ptr++];
 849         if (dev->broadcast_rcv_next_ptr == dev->num_broadcast_rcv_ptrs)
 850                 dev->broadcast_rcv_next_ptr = 0;
 851
 852         spin_unlock_irqrestore(&dev->lock, flags);
 853
 854         specifier_id =    (be32_to_cpu(buf_ptr[0]) & 0xffff) << 8
 855                         | (be32_to_cpu(buf_ptr[1]) & 0xff000000) >> 24;
 856         ver = be32_to_cpu(buf_ptr[1]) & 0xffffff;
 857         source_node_id = be32_to_cpu(buf_ptr[0]) >> 16;
 858
 859         if (specifier_id == IANA_SPECIFIER_ID && ver == RFC2734_SW_VERSION) {
 860                 buf_ptr += 2;
 861                 length -= IEEE1394_GASP_HDR_SIZE;
 862                 fwnet_incoming_packet(dev, buf_ptr, length, source_node_id,
 863                                       context->card->generation, true);
 864         }
 865
 866         packet.payload_length = dev->rcv_buffer_size;
 867         packet.interrupt = 1;
 868         packet.skip = 0;
 869         packet.tag = 3;
 870         packet.sy = 0;
 871         packet.header_length = IEEE1394_GASP_HDR_SIZE;
 872
 873         spin_lock_irqsave(&dev->lock, flags);
 874
 875         retval = fw_iso_context_queue(dev->broadcast_rcv_context, &packet,
 876                                       &dev->broadcast_rcv_buffer, offset);
 877
 878         spin_unlock_irqrestore(&dev->lock, flags);
 879
 880         if (retval >= 0)
 881                 fw_iso_context_queue_flush(dev->broadcast_rcv_context);
 882         else
 883                 dev_err(&dev->netdev->dev, "requeue failed\n");
 884 }
 885
 886 static struct kmem_cache *fwnet_packet_task_cache;
 887
 888 static void fwnet_free_ptask(struct fwnet_packet_task *ptask)
 889 {
 890         dev_kfree_skb_any(ptask->skb);
 891         kmem_cache_free(fwnet_packet_task_cache, ptask);
 892 }
 893
 894 /* Caller must hold dev->lock. */
 895 static void dec_queued_datagrams(struct fwnet_device *dev)
 896 {
 897         if (--dev->queued_datagrams == FWNET_MIN_QUEUED_DATAGRAMS)
 898                 netif_wake_queue(dev->netdev);
 899 }
 900
 901 static int fwnet_send_packet(struct fwnet_packet_task *ptask);
 902
 903 static void fwnet_transmit_packet_done(struct fwnet_packet_task *ptask)
 904 {
 905         struct fwnet_device *dev = ptask->dev;
 906         struct sk_buff *skb = ptask->skb;
 907         unsigned long flags;
 908         bool free;
 909
 910         spin_lock_irqsave(&dev->lock, flags);
 911
 912         ptask->outstanding_pkts--;
 913
 914         /* Check whether we or the networking TX soft-IRQ is last user. */
 915         free = (ptask->outstanding_pkts == 0 && ptask->enqueued);
 916         if (free)
 917                 dec_queued_datagrams(dev);
 918
 919         if (ptask->outstanding_pkts == 0) {
 920                 dev->netdev->stats.tx_packets++;
 921                 dev->netdev->stats.tx_bytes += skb->len;
 922         }
 923
 924         spin_unlock_irqrestore(&dev->lock, flags);
 925
 926         if (ptask->outstanding_pkts > 0) {
 927                 u16 dg_size;
 928                 u16 fg_off;
 929                 u16 datagram_label;
 930                 u16 lf;
 931
 932                 /* Update the ptask to point to the next fragment and send it */
 933                 lf = fwnet_get_hdr_lf(&ptask->hdr);
 934                 switch (lf) {
 935                 case RFC2374_HDR_LASTFRAG:
 936                 case RFC2374_HDR_UNFRAG:
 937                 default:
 938                         dev_err(&dev->netdev->dev,
 939                                 "outstanding packet %x lf %x, header %x,%x\n",
 940                                 ptask->outstanding_pkts, lf, ptask->hdr.w0,
 941                                 ptask->hdr.w1);
 942                         BUG();
 943
 944                 case RFC2374_HDR_FIRSTFRAG:
 945                         /* Set frag type here for future interior fragments */
 946                         dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
 947                         fg_off = ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
 948                         datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
 949                         break;
 950
 951                 case RFC2374_HDR_INTFRAG:
 952                         dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
 953                         fg_off = fwnet_get_hdr_fg_off(&ptask->hdr)
 954                                   + ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
 955                         datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
 956                         break;
 957                 }
 958
 959                 if (ptask->dest_node == IEEE1394_ALL_NODES) {
 960                         skb_pull(skb,
 961                                  ptask->max_payload + IEEE1394_GASP_HDR_SIZE);
 962                 } else {
 963                         skb_pull(skb, ptask->max_payload);
 964                 }
 965                 if (ptask->outstanding_pkts > 1) {
 966                         fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_INTFRAG,
 967                                           dg_size, fg_off, datagram_label);
 968                 } else {
 969                         fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_LASTFRAG,
 970                                           dg_size, fg_off, datagram_label);
 971                         ptask->max_payload = skb->len + RFC2374_FRAG_HDR_SIZE;
 972                 }
 973                 fwnet_send_packet(ptask);
 974         }
 975
 976         if (free)
 977                 fwnet_free_ptask(ptask);
 978 }
 979
 980 static void fwnet_transmit_packet_failed(struct fwnet_packet_task *ptask)
 981 {
 982         struct fwnet_device *dev = ptask->dev;
 983         unsigned long flags;
 984         bool free;
 985
 986         spin_lock_irqsave(&dev->lock, flags);
 987
 988         /* One fragment failed; don't try to send remaining fragments. */
 989         ptask->outstanding_pkts = 0;
 990
 991         /* Check whether we or the networking TX soft-IRQ is last user. */
 992         free = ptask->enqueued;
 993         if (free)
 994                 dec_queued_datagrams(dev);
 995
 996         dev->netdev->stats.tx_dropped++;
 997         dev->netdev->stats.tx_errors++;
 998
 999         spin_unlock_irqrestore(&dev->lock, flags);
1000
1001         if (free)
1002                 fwnet_free_ptask(ptask);
1003 }
1004
1005 static void fwnet_write_complete(struct fw_card *card, int rcode,
1006                                  void *payload, size_t length, void *data)
1007 {
1008         struct fwnet_packet_task *ptask = data;
1009         static unsigned long j;
1010         static int last_rcode, errors_skipped;
1011
1012         if (rcode == RCODE_COMPLETE) {
1013                 fwnet_transmit_packet_done(ptask);
1014         } else {
1015                 fwnet_transmit_packet_failed(ptask);
1016
1017                 if (printk_timed_ratelimit(&j,  1000) || rcode != last_rcode) {
1018                         dev_err(&ptask->dev->netdev->dev,
1019                                 "fwnet_write_complete failed: %x (skipped %d)\n",
1020                                 rcode, errors_skipped);
1021
1022                         errors_skipped = 0;
1023                         last_rcode = rcode;
1024                 } else
1025                         errors_skipped++;
1026         }
1027 }
1028
1029 static int fwnet_send_packet(struct fwnet_packet_task *ptask)
1030 {
1031         struct fwnet_device *dev;
1032         unsigned tx_len;
1033         struct rfc2734_header *bufhdr;
1034         unsigned long flags;
1035         bool free;
1036
1037         dev = ptask->dev;
1038         tx_len = ptask->max_payload;
1039         switch (fwnet_get_hdr_lf(&ptask->hdr)) {
1040         case RFC2374_HDR_UNFRAG:
1041                 bufhdr = (struct rfc2734_header *)
1042                                 skb_push(ptask->skb, RFC2374_UNFRAG_HDR_SIZE);
1043                 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
1044                 break;
1045
1046         case RFC2374_HDR_FIRSTFRAG:
1047         case RFC2374_HDR_INTFRAG:
1048         case RFC2374_HDR_LASTFRAG:
1049                 bufhdr = (struct rfc2734_header *)
1050                                 skb_push(ptask->skb, RFC2374_FRAG_HDR_SIZE);
1051                 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
1052                 put_unaligned_be32(ptask->hdr.w1, &bufhdr->w1);
1053                 break;
1054
1055         default:
1056                 BUG();
1057         }
1058         if (ptask->dest_node == IEEE1394_ALL_NODES) {
1059                 u8 *p;
1060                 int generation;
1061                 int node_id;
1062
1063                 /* ptask->generation may not have been set yet */
1064                 generation = dev->card->generation;
1065                 smp_rmb();
1066                 node_id = dev->card->node_id;
1067
1068                 p = skb_push(ptask->skb, IEEE1394_GASP_HDR_SIZE);
1069                 put_unaligned_be32(node_id << 16 | IANA_SPECIFIER_ID >> 8, p);
1070                 put_unaligned_be32((IANA_SPECIFIER_ID & 0xff) << 24
1071                                                 | RFC2734_SW_VERSION, &p[4]);
1072
1073                 /* We should not transmit if broadcast_channel.valid == 0. */
1074                 fw_send_request(dev->card, &ptask->transaction,
1075                                 TCODE_STREAM_DATA,
1076                                 fw_stream_packet_destination_id(3,
1077                                                 IEEE1394_BROADCAST_CHANNEL, 0),
1078                                 generation, SCODE_100, 0ULL, ptask->skb->data,
1079                                 tx_len + 8, fwnet_write_complete, ptask);
1080
1081                 spin_lock_irqsave(&dev->lock, flags);
1082
1083                 /* If the AT tasklet already ran, we may be last user. */
1084                 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1085                 if (!free)
1086                         ptask->enqueued = true;
1087                 else
1088                         dec_queued_datagrams(dev);
1089
1090                 spin_unlock_irqrestore(&dev->lock, flags);
1091
1092                 goto out;
1093         }
1094
1095         fw_send_request(dev->card, &ptask->transaction,
1096                         TCODE_WRITE_BLOCK_REQUEST, ptask->dest_node,
1097                         ptask->generation, ptask->speed, ptask->fifo_addr,
1098                         ptask->skb->data, tx_len, fwnet_write_complete, ptask);
1099
1100         spin_lock_irqsave(&dev->lock, flags);
1101
1102         /* If the AT tasklet already ran, we may be last user. */
1103         free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1104         if (!free)
1105                 ptask->enqueued = true;
1106         else
1107                 dec_queued_datagrams(dev);
1108
1109         spin_unlock_irqrestore(&dev->lock, flags);
1110
1111         dev->netdev->trans_start = jiffies;
1112  out:
1113         if (free)
1114                 fwnet_free_ptask(ptask);
1115
1116         return 0;
1117 }
1118
1119 static int fwnet_broadcast_start(struct fwnet_device *dev)
1120 {
1121         struct fw_iso_context *context;
1122         int retval;
1123         unsigned num_packets;
1124         unsigned max_receive;
1125         struct fw_iso_packet packet;
1126         unsigned long offset;
1127         unsigned u;
1128
1129         if (dev->local_fifo == FWNET_NO_FIFO_ADDR) {
1130                 dev->handler.length = 4096;
1131                 dev->handler.address_callback = fwnet_receive_packet;
1132                 dev->handler.callback_data = dev;
1133
1134                 retval = fw_core_add_address_handler(&dev->handler,
1135                                         &fw_high_memory_region);
1136                 if (retval < 0)
1137                         goto failed_initial;
1138
1139                 dev->local_fifo = dev->handler.offset;
1140         }
1141
1142         max_receive = 1U << (dev->card->max_receive + 1);
1143         num_packets = (FWNET_ISO_PAGE_COUNT * PAGE_SIZE) / max_receive;
1144
1145         if (!dev->broadcast_rcv_context) {
1146                 void **ptrptr;
1147
1148                 context = fw_iso_context_create(dev->card,
1149                     FW_ISO_CONTEXT_RECEIVE, IEEE1394_BROADCAST_CHANNEL,
1150                     dev->card->link_speed, 8, fwnet_receive_broadcast, dev);
1151                 if (IS_ERR(context)) {
1152                         retval = PTR_ERR(context);
1153                         goto failed_context_create;
1154                 }
1155
1156                 retval = fw_iso_buffer_init(&dev->broadcast_rcv_buffer,
1157                     dev->card, FWNET_ISO_PAGE_COUNT, DMA_FROM_DEVICE);
1158                 if (retval < 0)
1159                         goto failed_buffer_init;
1160
1161                 ptrptr = kmalloc(sizeof(void *) * num_packets, GFP_KERNEL);
1162                 if (!ptrptr) {
1163                         retval = -ENOMEM;
1164                         goto failed_ptrs_alloc;
1165                 }
1166
1167                 dev->broadcast_rcv_buffer_ptrs = ptrptr;
1168                 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++) {
1169                         void *ptr;
1170                         unsigned v;
1171
1172                         ptr = kmap(dev->broadcast_rcv_buffer.pages[u]);
1173                         for (v = 0; v < num_packets / FWNET_ISO_PAGE_COUNT; v++)
1174                                 *ptrptr++ = (void *)
1175                                                 ((char *)ptr + v * max_receive);
1176                 }
1177                 dev->broadcast_rcv_context = context;
1178         } else {
1179                 context = dev->broadcast_rcv_context;
1180         }
1181
1182         packet.payload_length = max_receive;
1183         packet.interrupt = 1;
1184         packet.skip = 0;
1185         packet.tag = 3;
1186         packet.sy = 0;
1187         packet.header_length = IEEE1394_GASP_HDR_SIZE;
1188         offset = 0;
1189
1190         for (u = 0; u < num_packets; u++) {
1191                 retval = fw_iso_context_queue(context, &packet,
1192                                 &dev->broadcast_rcv_buffer, offset);
1193                 if (retval < 0)
1194                         goto failed_rcv_queue;
1195
1196                 offset += max_receive;
1197         }
1198         dev->num_broadcast_rcv_ptrs = num_packets;
1199         dev->rcv_buffer_size = max_receive;
1200         dev->broadcast_rcv_next_ptr = 0U;
1201         retval = fw_iso_context_start(context, -1, 0,
1202                         FW_ISO_CONTEXT_MATCH_ALL_TAGS); /* ??? sync */
1203         if (retval < 0)
1204                 goto failed_rcv_queue;
1205
1206         /* FIXME: adjust it according to the min. speed of all known peers? */
1207         dev->broadcast_xmt_max_payload = IEEE1394_MAX_PAYLOAD_S100
1208                         - IEEE1394_GASP_HDR_SIZE - RFC2374_UNFRAG_HDR_SIZE;
1209         dev->broadcast_state = FWNET_BROADCAST_RUNNING;
1210
1211         return 0;
1212
1213  failed_rcv_queue:
1214         kfree(dev->broadcast_rcv_buffer_ptrs);
1215         dev->broadcast_rcv_buffer_ptrs = NULL;
1216  failed_ptrs_alloc:
1217         fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer, dev->card);
1218  failed_buffer_init:
1219         fw_iso_context_destroy(context);
1220         dev->broadcast_rcv_context = NULL;
1221  failed_context_create:
1222         fw_core_remove_address_handler(&dev->handler);
1223  failed_initial:
1224         dev->local_fifo = FWNET_NO_FIFO_ADDR;
1225
1226         return retval;
1227 }
1228
1229 static void set_carrier_state(struct fwnet_device *dev)
1230 {
1231         if (dev->peer_count > 1)
1232                 netif_carrier_on(dev->netdev);
1233         else
1234                 netif_carrier_off(dev->netdev);
1235 }
1236
1237 /* ifup */
1238 static int fwnet_open(struct net_device *net)
1239 {
1240         struct fwnet_device *dev = netdev_priv(net);
1241         int ret;
1242
1243         if (dev->broadcast_state == FWNET_BROADCAST_ERROR) {
1244                 ret = fwnet_broadcast_start(dev);
1245                 if (ret)
1246                         return ret;
1247         }
1248         netif_start_queue(net);
1249
1250         spin_lock_irq(&dev->lock);
1251         set_carrier_state(dev);
1252         spin_unlock_irq(&dev->lock);
1253
1254         return 0;
1255 }
1256
1257 /* ifdown */
1258 static int fwnet_stop(struct net_device *net)
1259 {
1260         netif_stop_queue(net);
1261
1262         /* Deallocate iso context for use by other applications? */
1263
1264         return 0;
1265 }
1266
1267 static netdev_tx_t fwnet_tx(struct sk_buff *skb, struct net_device *net)
1268 {
1269         struct fwnet_header hdr_buf;
1270         struct fwnet_device *dev = netdev_priv(net);
1271         __be16 proto;
1272         u16 dest_node;
1273         unsigned max_payload;
1274         u16 dg_size;
1275         u16 *datagram_label_ptr;
1276         struct fwnet_packet_task *ptask;
1277         struct fwnet_peer *peer;
1278         unsigned long flags;
1279
1280         spin_lock_irqsave(&dev->lock, flags);
1281
1282         /* Can this happen? */
1283         if (netif_queue_stopped(dev->netdev)) {
1284                 spin_unlock_irqrestore(&dev->lock, flags);
1285
1286                 return NETDEV_TX_BUSY;
1287         }
1288
1289         ptask = kmem_cache_alloc(fwnet_packet_task_cache, GFP_ATOMIC);
1290         if (ptask == NULL)
1291                 goto fail;
1292
1293         skb = skb_share_check(skb, GFP_ATOMIC);
1294         if (!skb)
1295                 goto fail;
1296
1297         /*
1298          * Make a copy of the driver-specific header.
1299          * We might need to rebuild the header on tx failure.
1300          */
1301         memcpy(&hdr_buf, skb->data, sizeof(hdr_buf));
1302         skb_pull(skb, sizeof(hdr_buf));
1303
1304         proto = hdr_buf.h_proto;
1305         dg_size = skb->len;
1306
1307         /*
1308          * Set the transmission type for the packet.  ARP packets and IP
1309          * broadcast packets are sent via GASP.
1310          */
1311         if (memcmp(hdr_buf.h_dest, net->broadcast, FWNET_ALEN) == 0
1312             || proto == htons(ETH_P_ARP)
1313             || (proto == htons(ETH_P_IP)
1314                 && IN_MULTICAST(ntohl(ip_hdr(skb)->daddr)))) {
1315                 max_payload        = dev->broadcast_xmt_max_payload;
1316                 datagram_label_ptr = &dev->broadcast_xmt_datagramlabel;
1317
1318                 ptask->fifo_addr   = FWNET_NO_FIFO_ADDR;
1319                 ptask->generation  = 0;
1320                 ptask->dest_node   = IEEE1394_ALL_NODES;
1321                 ptask->speed       = SCODE_100;
1322         } else {
1323                 __be64 guid = get_unaligned((__be64 *)hdr_buf.h_dest);
1324                 u8 generation;
1325
1326                 peer = fwnet_peer_find_by_guid(dev, be64_to_cpu(guid));
1327                 if (!peer || peer->fifo == FWNET_NO_FIFO_ADDR)
1328                         goto fail;
1329
1330                 generation         = peer->generation;
1331                 dest_node          = peer->node_id;
1332                 max_payload        = peer->max_payload;
1333                 datagram_label_ptr = &peer->datagram_label;
1334
1335                 ptask->fifo_addr   = peer->fifo;
1336                 ptask->generation  = generation;
1337                 ptask->dest_node   = dest_node;
1338                 ptask->speed       = peer->speed;
1339         }
1340
1341         /* If this is an ARP packet, convert it */
1342         if (proto == htons(ETH_P_ARP)) {
1343                 struct arphdr *arp = (struct arphdr *)skb->data;
1344                 unsigned char *arp_ptr = (unsigned char *)(arp + 1);
1345                 struct rfc2734_arp *arp1394 = (struct rfc2734_arp *)skb->data;
1346                 __be32 ipaddr;
1347
1348                 ipaddr = get_unaligned((__be32 *)(arp_ptr + FWNET_ALEN));
1349
1350                 arp1394->hw_addr_len    = RFC2734_HW_ADDR_LEN;
1351                 arp1394->max_rec        = dev->card->max_receive;
1352                 arp1394->sspd           = dev->card->link_speed;
1353
1354                 put_unaligned_be16(dev->local_fifo >> 32,
1355                                    &arp1394->fifo_hi);
1356                 put_unaligned_be32(dev->local_fifo & 0xffffffff,
1357                                    &arp1394->fifo_lo);
1358                 put_unaligned(ipaddr, &arp1394->sip);
1359         }
1360
1361         ptask->hdr.w0 = 0;
1362         ptask->hdr.w1 = 0;
1363         ptask->skb = skb;
1364         ptask->dev = dev;
1365
1366         /* Does it all fit in one packet? */
1367         if (dg_size <= max_payload) {
1368                 fwnet_make_uf_hdr(&ptask->hdr, ntohs(proto));
1369                 ptask->outstanding_pkts = 1;
1370                 max_payload = dg_size + RFC2374_UNFRAG_HDR_SIZE;
1371         } else {
1372                 u16 datagram_label;
1373
1374                 max_payload -= RFC2374_FRAG_OVERHEAD;
1375                 datagram_label = (*datagram_label_ptr)++;
1376                 fwnet_make_ff_hdr(&ptask->hdr, ntohs(proto), dg_size,
1377                                   datagram_label);
1378                 ptask->outstanding_pkts = DIV_ROUND_UP(dg_size, max_payload);
1379                 max_payload += RFC2374_FRAG_HDR_SIZE;
1380         }
1381
1382         if (++dev->queued_datagrams == FWNET_MAX_QUEUED_DATAGRAMS)
1383                 netif_stop_queue(dev->netdev);
1384
1385         spin_unlock_irqrestore(&dev->lock, flags);
1386
1387         ptask->max_payload = max_payload;
1388         ptask->enqueued    = 0;
1389
1390         fwnet_send_packet(ptask);
1391
1392         return NETDEV_TX_OK;
1393
1394  fail:
1395         spin_unlock_irqrestore(&dev->lock, flags);
1396
1397         if (ptask)
1398                 kmem_cache_free(fwnet_packet_task_cache, ptask);
1399
1400         if (skb != NULL)
1401                 dev_kfree_skb(skb);
1402
1403         net->stats.tx_dropped++;
1404         net->stats.tx_errors++;
1405
1406         /*
1407          * FIXME: According to a patch from 2003-02-26, "returning non-zero
1408          * causes serious problems" here, allegedly.  Before that patch,
1409          * -ERRNO was returned which is not appropriate under Linux 2.6.
1410          * Perhaps more needs to be done?  Stop the queue in serious
1411          * conditions and restart it elsewhere?
1412          */
1413         return NETDEV_TX_OK;
1414 }
1415
1416 static int fwnet_change_mtu(struct net_device *net, int new_mtu)
1417 {
1418         if (new_mtu < 68)
1419                 return -EINVAL;
1420
1421         net->mtu = new_mtu;
1422         return 0;
1423 }
1424
1425 static const struct ethtool_ops fwnet_ethtool_ops = {
1426         .get_link       = ethtool_op_get_link,
1427 };
1428
1429 static const struct net_device_ops fwnet_netdev_ops = {
1430         .ndo_open       = fwnet_open,
1431         .ndo_stop       = fwnet_stop,
1432         .ndo_start_xmit = fwnet_tx,
1433         .ndo_change_mtu = fwnet_change_mtu,
1434 };
1435
1436 static void fwnet_init_dev(struct net_device *net)
1437 {
1438         net->header_ops         = &fwnet_header_ops;
1439         net->netdev_ops         = &fwnet_netdev_ops;
1440         net->watchdog_timeo     = 2 * HZ;
1441         net->flags              = IFF_BROADCAST | IFF_MULTICAST;
1442         net->features           = NETIF_F_HIGHDMA;
1443         net->addr_len           = FWNET_ALEN;
1444         net->hard_header_len    = FWNET_HLEN;
1445         net->type               = ARPHRD_IEEE1394;
1446         net->tx_queue_len       = FWNET_TX_QUEUE_LEN;
1447         net->ethtool_ops        = &fwnet_ethtool_ops;
1448 }
1449
1450 /* caller must hold fwnet_device_mutex */
1451 static struct fwnet_device *fwnet_dev_find(struct fw_card *card)
1452 {
1453         struct fwnet_device *dev;
1454
1455         list_for_each_entry(dev, &fwnet_device_list, dev_link)
1456                 if (dev->card == card)
1457                         return dev;
1458
1459         return NULL;
1460 }
1461
1462 static int fwnet_add_peer(struct fwnet_device *dev,
1463                           struct fw_unit *unit, struct fw_device *device)
1464 {
1465         struct fwnet_peer *peer;
1466
1467         peer = kmalloc(sizeof(*peer), GFP_KERNEL);
1468         if (!peer)
1469                 return -ENOMEM;
1470
1471         dev_set_drvdata(&unit->device, peer);
1472
1473         peer->dev = dev;
1474         peer->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4];
1475         peer->fifo = FWNET_NO_FIFO_ADDR;
1476         peer->ip = 0;
1477         INIT_LIST_HEAD(&peer->pd_list);
1478         peer->pdg_size = 0;
1479         peer->datagram_label = 0;
1480         peer->speed = device->max_speed;
1481         peer->max_payload = fwnet_max_payload(device->max_rec, peer->speed);
1482
1483         peer->generation = device->generation;
1484         smp_rmb();
1485         peer->node_id = device->node_id;
1486
1487         spin_lock_irq(&dev->lock);
1488         list_add_tail(&peer->peer_link, &dev->peer_list);
1489         dev->peer_count++;
1490         set_carrier_state(dev);
1491         spin_unlock_irq(&dev->lock);
1492
1493         return 0;
1494 }
1495
1496 static int fwnet_probe(struct device *_dev)
1497 {
1498         struct fw_unit *unit = fw_unit(_dev);
1499         struct fw_device *device = fw_parent_device(unit);
1500         struct fw_card *card = device->card;
1501         struct net_device *net;
1502         bool allocated_netdev = false;
1503         struct fwnet_device *dev;
1504         unsigned max_mtu;
1505         int ret;
1506
1507         mutex_lock(&fwnet_device_mutex);
1508
1509         dev = fwnet_dev_find(card);
1510         if (dev) {
1511                 net = dev->netdev;
1512                 goto have_dev;
1513         }
1514
1515         net = alloc_netdev(sizeof(*dev), "firewire%d", fwnet_init_dev);
1516         if (net == NULL) {
1517                 ret = -ENOMEM;
1518                 goto out;
1519         }
1520
1521         allocated_netdev = true;
1522         SET_NETDEV_DEV(net, card->device);
1523         dev = netdev_priv(net);
1524
1525         spin_lock_init(&dev->lock);
1526         dev->broadcast_state = FWNET_BROADCAST_ERROR;
1527         dev->broadcast_rcv_context = NULL;
1528         dev->broadcast_xmt_max_payload = 0;
1529         dev->broadcast_xmt_datagramlabel = 0;
1530         dev->local_fifo = FWNET_NO_FIFO_ADDR;
1531         dev->queued_datagrams = 0;
1532         INIT_LIST_HEAD(&dev->peer_list);
1533         dev->card = card;
1534         dev->netdev = net;
1535
1536         /*
1537          * Use the RFC 2734 default 1500 octets or the maximum payload
1538          * as initial MTU
1539          */
1540         max_mtu = (1 << (card->max_receive + 1))
1541                   - sizeof(struct rfc2734_header) - IEEE1394_GASP_HDR_SIZE;
1542         net->mtu = min(1500U, max_mtu);
1543
1544         /* Set our hardware address while we're at it */
1545         put_unaligned_be64(card->guid, net->dev_addr);
1546         put_unaligned_be64(~0ULL, net->broadcast);
1547         ret = register_netdev(net);
1548         if (ret)
1549                 goto out;
1550
1551         list_add_tail(&dev->dev_link, &fwnet_device_list);
1552         dev_notice(&net->dev, "IPv4 over IEEE 1394 on card %s\n",
1553                    dev_name(card->device));
1554  have_dev:
1555         ret = fwnet_add_peer(dev, unit, device);
1556         if (ret && allocated_netdev) {
1557                 unregister_netdev(net);
1558                 list_del(&dev->dev_link);
1559         }
1560  out:
1561         if (ret && allocated_netdev)
1562                 free_netdev(net);
1563
1564         mutex_unlock(&fwnet_device_mutex);
1565
1566         return ret;
1567 }
1568
1569 static void fwnet_remove_peer(struct fwnet_peer *peer, struct fwnet_device *dev)
1570 {
1571         struct fwnet_partial_datagram *pd, *pd_next;
1572
1573         spin_lock_irq(&dev->lock);
1574         list_del(&peer->peer_link);
1575         dev->peer_count--;
1576         set_carrier_state(dev);
1577         spin_unlock_irq(&dev->lock);
1578
1579         list_for_each_entry_safe(pd, pd_next, &peer->pd_list, pd_link)
1580                 fwnet_pd_delete(pd);
1581
1582         kfree(peer);
1583 }
1584
1585 static int fwnet_remove(struct device *_dev)
1586 {
1587         struct fwnet_peer *peer = dev_get_drvdata(_dev);
1588         struct fwnet_device *dev = peer->dev;
1589         struct net_device *net;
1590         int i;
1591
1592         mutex_lock(&fwnet_device_mutex);
1593
1594         net = dev->netdev;
1595         if (net && peer->ip)
1596                 arp_invalidate(net, peer->ip);
1597
1598         fwnet_remove_peer(peer, dev);
1599
1600         if (list_empty(&dev->peer_list)) {
1601                 unregister_netdev(net);
1602
1603                 if (dev->local_fifo != FWNET_NO_FIFO_ADDR)
1604                         fw_core_remove_address_handler(&dev->handler);
1605                 if (dev->broadcast_rcv_context) {
1606                         fw_iso_context_stop(dev->broadcast_rcv_context);
1607                         fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer,
1608                                               dev->card);
1609                         fw_iso_context_destroy(dev->broadcast_rcv_context);
1610                 }
1611                 for (i = 0; dev->queued_datagrams && i < 5; i++)
1612                         ssleep(1);
1613                 WARN_ON(dev->queued_datagrams);
1614                 list_del(&dev->dev_link);
1615
1616                 free_netdev(net);
1617         }
1618
1619         mutex_unlock(&fwnet_device_mutex);
1620
1621         return 0;
1622 }
1623
1624 /*
1625  * FIXME abort partially sent fragmented datagrams,
1626  * discard partially received fragmented datagrams
1627  */
1628 static void fwnet_update(struct fw_unit *unit)
1629 {
1630         struct fw_device *device = fw_parent_device(unit);
1631         struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1632         int generation;
1633
1634         generation = device->generation;
1635
1636         spin_lock_irq(&peer->dev->lock);
1637         peer->node_id    = device->node_id;
1638         peer->generation = generation;
1639         spin_unlock_irq(&peer->dev->lock);
1640 }
1641
1642 static const struct ieee1394_device_id fwnet_id_table[] = {
1643         {
1644                 .match_flags  = IEEE1394_MATCH_SPECIFIER_ID |
1645                                 IEEE1394_MATCH_VERSION,
1646                 .specifier_id = IANA_SPECIFIER_ID,
1647                 .version      = RFC2734_SW_VERSION,
1648         },
1649         { }
1650 };
1651
1652 static struct fw_driver fwnet_driver = {
1653         .driver = {
1654                 .owner  = THIS_MODULE,
1655                 .name   = KBUILD_MODNAME,
1656                 .bus    = &fw_bus_type,
1657                 .probe  = fwnet_probe,
1658                 .remove = fwnet_remove,
1659         },
1660         .update   = fwnet_update,
1661         .id_table = fwnet_id_table,
1662 };
1663
1664 static const u32 rfc2374_unit_directory_data[] = {
1665         0x00040000,     /* directory_length             */
1666         0x1200005e,     /* unit_specifier_id: IANA      */
1667         0x81000003,     /* textual descriptor offset    */
1668         0x13000001,     /* unit_sw_version: RFC 2734    */
1669         0x81000005,     /* textual descriptor offset    */
1670         0x00030000,     /* descriptor_length            */
1671         0x00000000,     /* text                         */
1672         0x00000000,     /* minimal ASCII, en            */
1673         0x49414e41,     /* I A N A                      */
1674         0x00030000,     /* descriptor_length            */
1675         0x00000000,     /* text                         */
1676         0x00000000,     /* minimal ASCII, en            */
1677         0x49507634,     /* I P v 4                      */
1678 };
1679
1680 static struct fw_descriptor rfc2374_unit_directory = {
1681         .length = ARRAY_SIZE(rfc2374_unit_directory_data),
1682         .key    = (CSR_DIRECTORY | CSR_UNIT) << 24,
1683         .data   = rfc2374_unit_directory_data
1684 };
1685
1686 static int __init fwnet_init(void)
1687 {
1688         int err;
1689
1690         err = fw_core_add_descriptor(&rfc2374_unit_directory);
1691         if (err)
1692                 return err;
1693
1694         fwnet_packet_task_cache = kmem_cache_create("packet_task",
1695                         sizeof(struct fwnet_packet_task), 0, 0, NULL);
1696         if (!fwnet_packet_task_cache) {
1697                 err = -ENOMEM;
1698                 goto out;
1699         }
1700
1701         err = driver_register(&fwnet_driver.driver);
1702         if (!err)
1703                 return 0;
1704
1705         kmem_cache_destroy(fwnet_packet_task_cache);
1706 out:
1707         fw_core_remove_descriptor(&rfc2374_unit_directory);
1708
1709         return err;
1710 }
1711 module_init(fwnet_init);
1712
1713 static void __exit fwnet_cleanup(void)
1714 {
1715         driver_unregister(&fwnet_driver.driver);
1716         kmem_cache_destroy(fwnet_packet_task_cache);
1717         fw_core_remove_descriptor(&rfc2374_unit_directory);
1718 }
1719 module_exit(fwnet_cleanup);
1720
1721 MODULE_AUTHOR("Jay Fenlason <fenlason@redhat.com>");
1722 MODULE_DESCRIPTION("IPv4 over IEEE1394 as per RFC 2734");
1723 MODULE_LICENSE("GPL");
1724 MODULE_DEVICE_TABLE(ieee1394, fwnet_id_table);