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 static bool fwnet_hwaddr_is_multicast(u8 *ha)
  88 {
  89         return !!(*ha & 1);
  90 }
  91
  92 /* IPv4 and IPv6 encapsulation header */
  93 struct rfc2734_header {
  94         u32 w0;
  95         u32 w1;
  96 };
  97
  98 #define fwnet_get_hdr_lf(h)             (((h)->w0 & 0xc0000000) >> 30)
  99 #define fwnet_get_hdr_ether_type(h)     (((h)->w0 & 0x0000ffff))
 100 #define fwnet_get_hdr_dg_size(h)        (((h)->w0 & 0x0fff0000) >> 16)
 101 #define fwnet_get_hdr_fg_off(h)         (((h)->w0 & 0x00000fff))
 102 #define fwnet_get_hdr_dgl(h)            (((h)->w1 & 0xffff0000) >> 16)
 103
 104 #define fwnet_set_hdr_lf(lf)            ((lf)  << 30)
 105 #define fwnet_set_hdr_ether_type(et)    (et)
 106 #define fwnet_set_hdr_dg_size(dgs)      ((dgs) << 16)
 107 #define fwnet_set_hdr_fg_off(fgo)       (fgo)
 108
 109 #define fwnet_set_hdr_dgl(dgl)          ((dgl) << 16)
 110
 111 static inline void fwnet_make_uf_hdr(struct rfc2734_header *hdr,
 112                 unsigned ether_type)
 113 {
 114         hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_UNFRAG)
 115                   | fwnet_set_hdr_ether_type(ether_type);
 116 }
 117
 118 static inline void fwnet_make_ff_hdr(struct rfc2734_header *hdr,
 119                 unsigned ether_type, unsigned dg_size, unsigned dgl)
 120 {
 121         hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_FIRSTFRAG)
 122                   | fwnet_set_hdr_dg_size(dg_size)
 123                   | fwnet_set_hdr_ether_type(ether_type);
 124         hdr->w1 = fwnet_set_hdr_dgl(dgl);
 125 }
 126
 127 static inline void fwnet_make_sf_hdr(struct rfc2734_header *hdr,
 128                 unsigned lf, unsigned dg_size, unsigned fg_off, unsigned dgl)
 129 {
 130         hdr->w0 = fwnet_set_hdr_lf(lf)
 131                   | fwnet_set_hdr_dg_size(dg_size)
 132                   | fwnet_set_hdr_fg_off(fg_off);
 133         hdr->w1 = fwnet_set_hdr_dgl(dgl);
 134 }
 135
 136 /* This list keeps track of what parts of the datagram have been filled in */
 137 struct fwnet_fragment_info {
 138         struct list_head fi_link;
 139         u16 offset;
 140         u16 len;
 141 };
 142
 143 struct fwnet_partial_datagram {
 144         struct list_head pd_link;
 145         struct list_head fi_list;
 146         struct sk_buff *skb;
 147         /* FIXME Why not use skb->data? */
 148         char *pbuf;
 149         u16 datagram_label;
 150         u16 ether_type;
 151         u16 datagram_size;
 152 };
 153
 154 static DEFINE_MUTEX(fwnet_device_mutex);
 155 static LIST_HEAD(fwnet_device_list);
 156
 157 struct fwnet_device {
 158         struct list_head dev_link;
 159         spinlock_t lock;
 160         enum {
 161                 FWNET_BROADCAST_ERROR,
 162                 FWNET_BROADCAST_RUNNING,
 163                 FWNET_BROADCAST_STOPPED,
 164         } broadcast_state;
 165         struct fw_iso_context *broadcast_rcv_context;
 166         struct fw_iso_buffer broadcast_rcv_buffer;
 167         void **broadcast_rcv_buffer_ptrs;
 168         unsigned broadcast_rcv_next_ptr;
 169         unsigned num_broadcast_rcv_ptrs;
 170         unsigned rcv_buffer_size;
 171         /*
 172          * This value is the maximum unfragmented datagram size that can be
 173          * sent by the hardware.  It already has the GASP overhead and the
 174          * unfragmented datagram header overhead calculated into it.
 175          */
 176         unsigned broadcast_xmt_max_payload;
 177         u16 broadcast_xmt_datagramlabel;
 178
 179         /*
 180          * The CSR address that remote nodes must send datagrams to for us to
 181          * receive them.
 182          */
 183         struct fw_address_handler handler;
 184         u64 local_fifo;
 185
 186         /* Number of tx datagrams that have been queued but not yet acked */
 187         int queued_datagrams;
 188
 189         int peer_count;
 190         struct list_head peer_list;
 191         struct fw_card *card;
 192         struct net_device *netdev;
 193 };
 194
 195 struct fwnet_peer {
 196         struct list_head peer_link;
 197         struct fwnet_device *dev;
 198         u64 guid;
 199         u64 fifo;
 200         __be32 ip;
 201
 202         /* guarded by dev->lock */
 203         struct list_head pd_list; /* received partial datagrams */
 204         unsigned pdg_size;        /* pd_list size */
 205
 206         u16 datagram_label;       /* outgoing datagram label */
 207         u16 max_payload;          /* includes RFC2374_FRAG_HDR_SIZE overhead */
 208         int node_id;
 209         int generation;
 210         unsigned speed;
 211 };
 212
 213 /* This is our task struct. It's used for the packet complete callback.  */
 214 struct fwnet_packet_task {
 215         struct fw_transaction transaction;
 216         struct rfc2734_header hdr;
 217         struct sk_buff *skb;
 218         struct fwnet_device *dev;
 219
 220         int outstanding_pkts;
 221         u64 fifo_addr;
 222         u16 dest_node;
 223         u16 max_payload;
 224         u8 generation;
 225         u8 speed;
 226         u8 enqueued;
 227 };
 228
 229 /*
 230  * saddr == NULL means use device source address.
 231  * daddr == NULL means leave destination address (eg unresolved arp).
 232  */
 233 static int fwnet_header_create(struct sk_buff *skb, struct net_device *net,
 234                         unsigned short type, const void *daddr,
 235                         const void *saddr, unsigned len)
 236 {
 237         struct fwnet_header *h;
 238
 239         h = (struct fwnet_header *)skb_push(skb, sizeof(*h));
 240         put_unaligned_be16(type, &h->h_proto);
 241
 242         if (net->flags & (IFF_LOOPBACK | IFF_NOARP)) {
 243                 memset(h->h_dest, 0, net->addr_len);
 244
 245                 return net->hard_header_len;
 246         }
 247
 248         if (daddr) {
 249                 memcpy(h->h_dest, daddr, net->addr_len);
 250
 251                 return net->hard_header_len;
 252         }
 253
 254         return -net->hard_header_len;
 255 }
 256
 257 static int fwnet_header_rebuild(struct sk_buff *skb)
 258 {
 259         struct fwnet_header *h = (struct fwnet_header *)skb->data;
 260
 261         if (get_unaligned_be16(&h->h_proto) == ETH_P_IP)
 262                 return arp_find((unsigned char *)&h->h_dest, skb);
 263
 264         dev_notice(&skb->dev->dev, "unable to resolve type %04x addresses\n",
 265                    be16_to_cpu(h->h_proto));
 266         return 0;
 267 }
 268
 269 static int fwnet_header_cache(const struct neighbour *neigh,
 270                               struct hh_cache *hh, __be16 type)
 271 {
 272         struct net_device *net;
 273         struct fwnet_header *h;
 274
 275         if (type == cpu_to_be16(ETH_P_802_3))
 276                 return -1;
 277         net = neigh->dev;
 278         h = (struct fwnet_header *)((u8 *)hh->hh_data + HH_DATA_OFF(sizeof(*h)));
 279         h->h_proto = type;
 280         memcpy(h->h_dest, neigh->ha, net->addr_len);
 281         hh->hh_len = FWNET_HLEN;
 282
 283         return 0;
 284 }
 285
 286 /* Called by Address Resolution module to notify changes in address. */
 287 static void fwnet_header_cache_update(struct hh_cache *hh,
 288                 const struct net_device *net, const unsigned char *haddr)
 289 {
 290         memcpy((u8 *)hh->hh_data + HH_DATA_OFF(FWNET_HLEN), haddr, net->addr_len);
 291 }
 292
 293 static int fwnet_header_parse(const struct sk_buff *skb, unsigned char *haddr)
 294 {
 295         memcpy(haddr, skb->dev->dev_addr, FWNET_ALEN);
 296
 297         return FWNET_ALEN;
 298 }
 299
 300 static const struct header_ops fwnet_header_ops = {
 301         .create         = fwnet_header_create,
 302         .rebuild        = fwnet_header_rebuild,
 303         .cache          = fwnet_header_cache,
 304         .cache_update   = fwnet_header_cache_update,
 305         .parse          = fwnet_header_parse,
 306 };
 307
 308 /* FIXME: is this correct for all cases? */
 309 static bool fwnet_frag_overlap(struct fwnet_partial_datagram *pd,
 310                                unsigned offset, unsigned len)
 311 {
 312         struct fwnet_fragment_info *fi;
 313         unsigned end = offset + len;
 314
 315         list_for_each_entry(fi, &pd->fi_list, fi_link)
 316                 if (offset < fi->offset + fi->len && end > fi->offset)
 317                         return true;
 318
 319         return false;
 320 }
 321
 322 /* Assumes that new fragment does not overlap any existing fragments */
 323 static struct fwnet_fragment_info *fwnet_frag_new(
 324         struct fwnet_partial_datagram *pd, unsigned offset, unsigned len)
 325 {
 326         struct fwnet_fragment_info *fi, *fi2, *new;
 327         struct list_head *list;
 328
 329         list = &pd->fi_list;
 330         list_for_each_entry(fi, &pd->fi_list, fi_link) {
 331                 if (fi->offset + fi->len == offset) {
 332                         /* The new fragment can be tacked on to the end */
 333                         /* Did the new fragment plug a hole? */
 334                         fi2 = list_entry(fi->fi_link.next,
 335                                          struct fwnet_fragment_info, fi_link);
 336                         if (fi->offset + fi->len == fi2->offset) {
 337                                 /* glue fragments together */
 338                                 fi->len += len + fi2->len;
 339                                 list_del(&fi2->fi_link);
 340                                 kfree(fi2);
 341                         } else {
 342                                 fi->len += len;
 343                         }
 344
 345                         return fi;
 346                 }
 347                 if (offset + len == fi->offset) {
 348                         /* The new fragment can be tacked on to the beginning */
 349                         /* Did the new fragment plug a hole? */
 350                         fi2 = list_entry(fi->fi_link.prev,
 351                                          struct fwnet_fragment_info, fi_link);
 352                         if (fi2->offset + fi2->len == fi->offset) {
 353                                 /* glue fragments together */
 354                                 fi2->len += fi->len + len;
 355                                 list_del(&fi->fi_link);
 356                                 kfree(fi);
 357
 358                                 return fi2;
 359                         }
 360                         fi->offset = offset;
 361                         fi->len += len;
 362
 363                         return fi;
 364                 }
 365                 if (offset > fi->offset + fi->len) {
 366                         list = &fi->fi_link;
 367                         break;
 368                 }
 369                 if (offset + len < fi->offset) {
 370                         list = fi->fi_link.prev;
 371                         break;
 372                 }
 373         }
 374
 375         new = kmalloc(sizeof(*new), GFP_ATOMIC);
 376         if (!new) {
 377                 dev_err(&pd->skb->dev->dev, "out of memory\n");
 378                 return NULL;
 379         }
 380
 381         new->offset = offset;
 382         new->len = len;
 383         list_add(&new->fi_link, list);
 384
 385         return new;
 386 }
 387
 388 static struct fwnet_partial_datagram *fwnet_pd_new(struct net_device *net,
 389                 struct fwnet_peer *peer, u16 datagram_label, unsigned dg_size,
 390                 void *frag_buf, unsigned frag_off, unsigned frag_len)
 391 {
 392         struct fwnet_partial_datagram *new;
 393         struct fwnet_fragment_info *fi;
 394
 395         new = kmalloc(sizeof(*new), GFP_ATOMIC);
 396         if (!new)
 397                 goto fail;
 398
 399         INIT_LIST_HEAD(&new->fi_list);
 400         fi = fwnet_frag_new(new, frag_off, frag_len);
 401         if (fi == NULL)
 402                 goto fail_w_new;
 403
 404         new->datagram_label = datagram_label;
 405         new->datagram_size = dg_size;
 406         new->skb = dev_alloc_skb(dg_size + LL_RESERVED_SPACE(net));
 407         if (new->skb == NULL)
 408                 goto fail_w_fi;
 409
 410         skb_reserve(new->skb, LL_RESERVED_SPACE(net));
 411         new->pbuf = skb_put(new->skb, dg_size);
 412         memcpy(new->pbuf + frag_off, frag_buf, frag_len);
 413         list_add_tail(&new->pd_link, &peer->pd_list);
 414
 415         return new;
 416
 417 fail_w_fi:
 418         kfree(fi);
 419 fail_w_new:
 420         kfree(new);
 421 fail:
 422         dev_err(&net->dev, "out of memory\n");
 423
 424         return NULL;
 425 }
 426
 427 static struct fwnet_partial_datagram *fwnet_pd_find(struct fwnet_peer *peer,
 428                                                     u16 datagram_label)
 429 {
 430         struct fwnet_partial_datagram *pd;
 431
 432         list_for_each_entry(pd, &peer->pd_list, pd_link)
 433                 if (pd->datagram_label == datagram_label)
 434                         return pd;
 435
 436         return NULL;
 437 }
 438
 439
 440 static void fwnet_pd_delete(struct fwnet_partial_datagram *old)
 441 {
 442         struct fwnet_fragment_info *fi, *n;
 443
 444         list_for_each_entry_safe(fi, n, &old->fi_list, fi_link)
 445                 kfree(fi);
 446
 447         list_del(&old->pd_link);
 448         dev_kfree_skb_any(old->skb);
 449         kfree(old);
 450 }
 451
 452 static bool fwnet_pd_update(struct fwnet_peer *peer,
 453                 struct fwnet_partial_datagram *pd, void *frag_buf,
 454                 unsigned frag_off, unsigned frag_len)
 455 {
 456         if (fwnet_frag_new(pd, frag_off, frag_len) == NULL)
 457                 return false;
 458
 459         memcpy(pd->pbuf + frag_off, frag_buf, frag_len);
 460
 461         /*
 462          * Move list entry to beginning of list so that oldest partial
 463          * datagrams percolate to the end of the list
 464          */
 465         list_move_tail(&pd->pd_link, &peer->pd_list);
 466
 467         return true;
 468 }
 469
 470 static bool fwnet_pd_is_complete(struct fwnet_partial_datagram *pd)
 471 {
 472         struct fwnet_fragment_info *fi;
 473
 474         fi = list_entry(pd->fi_list.next, struct fwnet_fragment_info, fi_link);
 475
 476         return fi->len == pd->datagram_size;
 477 }
 478
 479 /* caller must hold dev->lock */
 480 static struct fwnet_peer *fwnet_peer_find_by_guid(struct fwnet_device *dev,
 481                                                   u64 guid)
 482 {
 483         struct fwnet_peer *peer;
 484
 485         list_for_each_entry(peer, &dev->peer_list, peer_link)
 486                 if (peer->guid == guid)
 487                         return peer;
 488
 489         return NULL;
 490 }
 491
 492 /* caller must hold dev->lock */
 493 static struct fwnet_peer *fwnet_peer_find_by_node_id(struct fwnet_device *dev,
 494                                                 int node_id, int generation)
 495 {
 496         struct fwnet_peer *peer;
 497
 498         list_for_each_entry(peer, &dev->peer_list, peer_link)
 499                 if (peer->node_id    == node_id &&
 500                     peer->generation == generation)
 501                         return peer;
 502
 503         return NULL;
 504 }
 505
 506 /* See IEEE 1394-2008 table 6-4, table 8-8, table 16-18. */
 507 static unsigned fwnet_max_payload(unsigned max_rec, unsigned speed)
 508 {
 509         max_rec = min(max_rec, speed + 8);
 510         max_rec = clamp(max_rec, 8U, 11U); /* 512...4096 */
 511
 512         return (1 << (max_rec + 1)) - RFC2374_FRAG_HDR_SIZE;
 513 }
 514
 515
 516 static int fwnet_finish_incoming_packet(struct net_device *net,
 517                                         struct sk_buff *skb, u16 source_node_id,
 518                                         bool is_broadcast, u16 ether_type)
 519 {
 520         struct fwnet_device *dev;
 521         static const __be64 broadcast_hw = cpu_to_be64(~0ULL);
 522         int status;
 523         __be64 guid;
 524
 525         switch (ether_type) {
 526         case ETH_P_ARP:
 527         case ETH_P_IP:
 528                 break;
 529         default:
 530                 goto err;
 531         }
 532
 533         dev = netdev_priv(net);
 534         /* Write metadata, and then pass to the receive level */
 535         skb->dev = net;
 536         skb->ip_summed = CHECKSUM_NONE;
 537
 538         /*
 539          * Parse the encapsulation header. This actually does the job of
 540          * converting to an ethernet frame header, as well as arp
 541          * conversion if needed. ARP conversion is easier in this
 542          * direction, since we are using ethernet as our backend.
 543          */
 544         /*
 545          * If this is an ARP packet, convert it. First, we want to make
 546          * use of some of the fields, since they tell us a little bit
 547          * about the sending machine.
 548          */
 549         if (ether_type == ETH_P_ARP) {
 550                 struct rfc2734_arp *arp1394;
 551                 struct arphdr *arp;
 552                 unsigned char *arp_ptr;
 553                 u64 fifo_addr;
 554                 u64 peer_guid;
 555                 unsigned sspd;
 556                 u16 max_payload;
 557                 struct fwnet_peer *peer;
 558                 unsigned long flags;
 559
 560                 arp1394   = (struct rfc2734_arp *)skb->data;
 561                 arp       = (struct arphdr *)skb->data;
 562                 arp_ptr   = (unsigned char *)(arp + 1);
 563                 peer_guid = get_unaligned_be64(&arp1394->s_uniq_id);
 564                 fifo_addr = (u64)get_unaligned_be16(&arp1394->fifo_hi) << 32
 565                                 | get_unaligned_be32(&arp1394->fifo_lo);
 566
 567                 sspd = arp1394->sspd;
 568                 /* Sanity check.  OS X 10.3 PPC reportedly sends 131. */
 569                 if (sspd > SCODE_3200) {
 570                         dev_notice(&net->dev, "sspd %x out of range\n", sspd);
 571                         sspd = SCODE_3200;
 572                 }
 573                 max_payload = fwnet_max_payload(arp1394->max_rec, sspd);
 574
 575                 spin_lock_irqsave(&dev->lock, flags);
 576                 peer = fwnet_peer_find_by_guid(dev, peer_guid);
 577                 if (peer) {
 578                         peer->fifo = fifo_addr;
 579
 580                         if (peer->speed > sspd)
 581                                 peer->speed = sspd;
 582                         if (peer->max_payload > max_payload)
 583                                 peer->max_payload = max_payload;
 584
 585                         peer->ip = arp1394->sip;
 586                 }
 587                 spin_unlock_irqrestore(&dev->lock, flags);
 588
 589                 if (!peer) {
 590                         dev_notice(&net->dev,
 591                                    "no peer for ARP packet from %016llx\n",
 592                                    (unsigned long long)peer_guid);
 593                         goto no_peer;
 594                 }
 595
 596                 /*
 597                  * Now that we're done with the 1394 specific stuff, we'll
 598                  * need to alter some of the data.  Believe it or not, all
 599                  * that needs to be done is sender_IP_address needs to be
 600                  * moved, the destination hardware address get stuffed
 601                  * in and the hardware address length set to 8.
 602                  *
 603                  * IMPORTANT: The code below overwrites 1394 specific data
 604                  * needed above so keep the munging of the data for the
 605                  * higher level IP stack last.
 606                  */
 607
 608                 arp->ar_hln = 8;
 609                 /* skip over sender unique id */
 610                 arp_ptr += arp->ar_hln;
 611                 /* move sender IP addr */
 612                 put_unaligned(arp1394->sip, (u32 *)arp_ptr);
 613                 /* skip over sender IP addr */
 614                 arp_ptr += arp->ar_pln;
 615
 616                 if (arp->ar_op == htons(ARPOP_REQUEST))
 617                         memset(arp_ptr, 0, sizeof(u64));
 618                 else
 619                         memcpy(arp_ptr, net->dev_addr, sizeof(u64));
 620         }
 621
 622         /* Now add the ethernet header. */
 623         guid = cpu_to_be64(dev->card->guid);
 624         if (dev_hard_header(skb, net, ether_type,
 625                            is_broadcast ? &broadcast_hw : &guid,
 626                            NULL, skb->len) >= 0) {
 627                 struct fwnet_header *eth;
 628                 u16 *rawp;
 629                 __be16 protocol;
 630
 631                 skb_reset_mac_header(skb);
 632                 skb_pull(skb, sizeof(*eth));
 633                 eth = (struct fwnet_header *)skb_mac_header(skb);
 634                 if (fwnet_hwaddr_is_multicast(eth->h_dest)) {
 635                         if (memcmp(eth->h_dest, net->broadcast,
 636                                    net->addr_len) == 0)
 637                                 skb->pkt_type = PACKET_BROADCAST;
 638 #if 0
 639                         else
 640                                 skb->pkt_type = PACKET_MULTICAST;
 641 #endif
 642                 } else {
 643                         if (memcmp(eth->h_dest, net->dev_addr, net->addr_len))
 644                                 skb->pkt_type = PACKET_OTHERHOST;
 645                 }
 646                 if (ntohs(eth->h_proto) >= 1536) {
 647                         protocol = eth->h_proto;
 648                 } else {
 649                         rawp = (u16 *)skb->data;
 650                         if (*rawp == 0xffff)
 651                                 protocol = htons(ETH_P_802_3);
 652                         else
 653                                 protocol = htons(ETH_P_802_2);
 654                 }
 655                 skb->protocol = protocol;
 656         }
 657         status = netif_rx(skb);
 658         if (status == NET_RX_DROP) {
 659                 net->stats.rx_errors++;
 660                 net->stats.rx_dropped++;
 661         } else {
 662                 net->stats.rx_packets++;
 663                 net->stats.rx_bytes += skb->len;
 664         }
 665
 666         return 0;
 667
 668  no_peer:
 669  err:
 670         net->stats.rx_errors++;
 671         net->stats.rx_dropped++;
 672
 673         dev_kfree_skb_any(skb);
 674
 675         return -ENOENT;
 676 }
 677
 678 static int fwnet_incoming_packet(struct fwnet_device *dev, __be32 *buf, int len,
 679                                  int source_node_id, int generation,
 680                                  bool is_broadcast)
 681 {
 682         struct sk_buff *skb;
 683         struct net_device *net = dev->netdev;
 684         struct rfc2734_header hdr;
 685         unsigned lf;
 686         unsigned long flags;
 687         struct fwnet_peer *peer;
 688         struct fwnet_partial_datagram *pd;
 689         int fg_off;
 690         int dg_size;
 691         u16 datagram_label;
 692         int retval;
 693         u16 ether_type;
 694
 695         hdr.w0 = be32_to_cpu(buf[0]);
 696         lf = fwnet_get_hdr_lf(&hdr);
 697         if (lf == RFC2374_HDR_UNFRAG) {
 698                 /*
 699                  * An unfragmented datagram has been received by the ieee1394
 700                  * bus. Build an skbuff around it so we can pass it to the
 701                  * high level network layer.
 702                  */
 703                 ether_type = fwnet_get_hdr_ether_type(&hdr);
 704                 buf++;
 705                 len -= RFC2374_UNFRAG_HDR_SIZE;
 706
 707                 skb = dev_alloc_skb(len + LL_RESERVED_SPACE(net));
 708                 if (unlikely(!skb)) {
 709                         dev_err(&net->dev, "out of memory\n");
 710                         net->stats.rx_dropped++;
 711
 712                         return -ENOMEM;
 713                 }
 714                 skb_reserve(skb, LL_RESERVED_SPACE(net));
 715                 memcpy(skb_put(skb, len), buf, len);
 716
 717                 return fwnet_finish_incoming_packet(net, skb, source_node_id,
 718                                                     is_broadcast, ether_type);
 719         }
 720         /* A datagram fragment has been received, now the fun begins. */
 721         hdr.w1 = ntohl(buf[1]);
 722         buf += 2;
 723         len -= RFC2374_FRAG_HDR_SIZE;
 724         if (lf == RFC2374_HDR_FIRSTFRAG) {
 725                 ether_type = fwnet_get_hdr_ether_type(&hdr);
 726                 fg_off = 0;
 727         } else {
 728                 ether_type = 0;
 729                 fg_off = fwnet_get_hdr_fg_off(&hdr);
 730         }
 731         datagram_label = fwnet_get_hdr_dgl(&hdr);
 732         dg_size = fwnet_get_hdr_dg_size(&hdr); /* ??? + 1 */
 733
 734         spin_lock_irqsave(&dev->lock, flags);
 735
 736         peer = fwnet_peer_find_by_node_id(dev, source_node_id, generation);
 737         if (!peer) {
 738                 retval = -ENOENT;
 739                 goto fail;
 740         }
 741
 742         pd = fwnet_pd_find(peer, datagram_label);
 743         if (pd == NULL) {
 744                 while (peer->pdg_size >= FWNET_MAX_FRAGMENTS) {
 745                         /* remove the oldest */
 746                         fwnet_pd_delete(list_first_entry(&peer->pd_list,
 747                                 struct fwnet_partial_datagram, pd_link));
 748                         peer->pdg_size--;
 749                 }
 750                 pd = fwnet_pd_new(net, peer, datagram_label,
 751                                   dg_size, buf, fg_off, len);
 752                 if (pd == NULL) {
 753                         retval = -ENOMEM;
 754                         goto fail;
 755                 }
 756                 peer->pdg_size++;
 757         } else {
 758                 if (fwnet_frag_overlap(pd, fg_off, len) ||
 759                     pd->datagram_size != dg_size) {
 760                         /*
 761                          * Differing datagram sizes or overlapping fragments,
 762                          * discard old datagram and start a new one.
 763                          */
 764                         fwnet_pd_delete(pd);
 765                         pd = fwnet_pd_new(net, peer, datagram_label,
 766                                           dg_size, buf, fg_off, len);
 767                         if (pd == NULL) {
 768                                 peer->pdg_size--;
 769                                 retval = -ENOMEM;
 770                                 goto fail;
 771                         }
 772                 } else {
 773                         if (!fwnet_pd_update(peer, pd, buf, fg_off, len)) {
 774                                 /*
 775                                  * Couldn't save off fragment anyway
 776                                  * so might as well obliterate the
 777                                  * datagram now.
 778                                  */
 779                                 fwnet_pd_delete(pd);
 780                                 peer->pdg_size--;
 781                                 retval = -ENOMEM;
 782                                 goto fail;
 783                         }
 784                 }
 785         } /* new datagram or add to existing one */
 786
 787         if (lf == RFC2374_HDR_FIRSTFRAG)
 788                 pd->ether_type = ether_type;
 789
 790         if (fwnet_pd_is_complete(pd)) {
 791                 ether_type = pd->ether_type;
 792                 peer->pdg_size--;
 793                 skb = skb_get(pd->skb);
 794                 fwnet_pd_delete(pd);
 795
 796                 spin_unlock_irqrestore(&dev->lock, flags);
 797
 798                 return fwnet_finish_incoming_packet(net, skb, source_node_id,
 799                                                     false, ether_type);
 800         }
 801         /*
 802          * Datagram is not complete, we're done for the
 803          * moment.
 804          */
 805         retval = 0;
 806  fail:
 807         spin_unlock_irqrestore(&dev->lock, flags);
 808
 809         return retval;
 810 }
 811
 812 static void fwnet_receive_packet(struct fw_card *card, struct fw_request *r,
 813                 int tcode, int destination, int source, int generation,
 814                 unsigned long long offset, void *payload, size_t length,
 815                 void *callback_data)
 816 {
 817         struct fwnet_device *dev = callback_data;
 818         int rcode;
 819
 820         if (destination == IEEE1394_ALL_NODES) {
 821                 kfree(r);
 822
 823                 return;
 824         }
 825
 826         if (offset != dev->handler.offset)
 827                 rcode = RCODE_ADDRESS_ERROR;
 828         else if (tcode != TCODE_WRITE_BLOCK_REQUEST)
 829                 rcode = RCODE_TYPE_ERROR;
 830         else if (fwnet_incoming_packet(dev, payload, length,
 831                                        source, generation, false) != 0) {
 832                 dev_err(&dev->netdev->dev, "incoming packet failure\n");
 833                 rcode = RCODE_CONFLICT_ERROR;
 834         } else
 835                 rcode = RCODE_COMPLETE;
 836
 837         fw_send_response(card, r, rcode);
 838 }
 839
 840 static void fwnet_receive_broadcast(struct fw_iso_context *context,
 841                 u32 cycle, size_t header_length, void *header, void *data)
 842 {
 843         struct fwnet_device *dev;
 844         struct fw_iso_packet packet;
 845         __be16 *hdr_ptr;
 846         __be32 *buf_ptr;
 847         int retval;
 848         u32 length;
 849         u16 source_node_id;
 850         u32 specifier_id;
 851         u32 ver;
 852         unsigned long offset;
 853         unsigned long flags;
 854
 855         dev = data;
 856         hdr_ptr = header;
 857         length = be16_to_cpup(hdr_ptr);
 858
 859         spin_lock_irqsave(&dev->lock, flags);
 860
 861         offset = dev->rcv_buffer_size * dev->broadcast_rcv_next_ptr;
 862         buf_ptr = dev->broadcast_rcv_buffer_ptrs[dev->broadcast_rcv_next_ptr++];
 863         if (dev->broadcast_rcv_next_ptr == dev->num_broadcast_rcv_ptrs)
 864                 dev->broadcast_rcv_next_ptr = 0;
 865
 866         spin_unlock_irqrestore(&dev->lock, flags);
 867
 868         specifier_id =    (be32_to_cpu(buf_ptr[0]) & 0xffff) << 8
 869                         | (be32_to_cpu(buf_ptr[1]) & 0xff000000) >> 24;
 870         ver = be32_to_cpu(buf_ptr[1]) & 0xffffff;
 871         source_node_id = be32_to_cpu(buf_ptr[0]) >> 16;
 872
 873         if (specifier_id == IANA_SPECIFIER_ID && ver == RFC2734_SW_VERSION) {
 874                 buf_ptr += 2;
 875                 length -= IEEE1394_GASP_HDR_SIZE;
 876                 fwnet_incoming_packet(dev, buf_ptr, length, source_node_id,
 877                                       context->card->generation, true);
 878         }
 879
 880         packet.payload_length = dev->rcv_buffer_size;
 881         packet.interrupt = 1;
 882         packet.skip = 0;
 883         packet.tag = 3;
 884         packet.sy = 0;
 885         packet.header_length = IEEE1394_GASP_HDR_SIZE;
 886
 887         spin_lock_irqsave(&dev->lock, flags);
 888
 889         retval = fw_iso_context_queue(dev->broadcast_rcv_context, &packet,
 890                                       &dev->broadcast_rcv_buffer, offset);
 891
 892         spin_unlock_irqrestore(&dev->lock, flags);
 893
 894         if (retval >= 0)
 895                 fw_iso_context_queue_flush(dev->broadcast_rcv_context);
 896         else
 897                 dev_err(&dev->netdev->dev, "requeue failed\n");
 898 }
 899
 900 static struct kmem_cache *fwnet_packet_task_cache;
 901
 902 static void fwnet_free_ptask(struct fwnet_packet_task *ptask)
 903 {
 904         dev_kfree_skb_any(ptask->skb);
 905         kmem_cache_free(fwnet_packet_task_cache, ptask);
 906 }
 907
 908 /* Caller must hold dev->lock. */
 909 static void dec_queued_datagrams(struct fwnet_device *dev)
 910 {
 911         if (--dev->queued_datagrams == FWNET_MIN_QUEUED_DATAGRAMS)
 912                 netif_wake_queue(dev->netdev);
 913 }
 914
 915 static int fwnet_send_packet(struct fwnet_packet_task *ptask);
 916
 917 static void fwnet_transmit_packet_done(struct fwnet_packet_task *ptask)
 918 {
 919         struct fwnet_device *dev = ptask->dev;
 920         struct sk_buff *skb = ptask->skb;
 921         unsigned long flags;
 922         bool free;
 923
 924         spin_lock_irqsave(&dev->lock, flags);
 925
 926         ptask->outstanding_pkts--;
 927
 928         /* Check whether we or the networking TX soft-IRQ is last user. */
 929         free = (ptask->outstanding_pkts == 0 && ptask->enqueued);
 930         if (free)
 931                 dec_queued_datagrams(dev);
 932
 933         if (ptask->outstanding_pkts == 0) {
 934                 dev->netdev->stats.tx_packets++;
 935                 dev->netdev->stats.tx_bytes += skb->len;
 936         }
 937
 938         spin_unlock_irqrestore(&dev->lock, flags);
 939
 940         if (ptask->outstanding_pkts > 0) {
 941                 u16 dg_size;
 942                 u16 fg_off;
 943                 u16 datagram_label;
 944                 u16 lf;
 945
 946                 /* Update the ptask to point to the next fragment and send it */
 947                 lf = fwnet_get_hdr_lf(&ptask->hdr);
 948                 switch (lf) {
 949                 case RFC2374_HDR_LASTFRAG:
 950                 case RFC2374_HDR_UNFRAG:
 951                 default:
 952                         dev_err(&dev->netdev->dev,
 953                                 "outstanding packet %x lf %x, header %x,%x\n",
 954                                 ptask->outstanding_pkts, lf, ptask->hdr.w0,
 955                                 ptask->hdr.w1);
 956                         BUG();
 957
 958                 case RFC2374_HDR_FIRSTFRAG:
 959                         /* Set frag type here for future interior fragments */
 960                         dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
 961                         fg_off = ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
 962                         datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
 963                         break;
 964
 965                 case RFC2374_HDR_INTFRAG:
 966                         dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
 967                         fg_off = fwnet_get_hdr_fg_off(&ptask->hdr)
 968                                   + ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
 969                         datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
 970                         break;
 971                 }
 972
 973                 if (ptask->dest_node == IEEE1394_ALL_NODES) {
 974                         skb_pull(skb,
 975                                  ptask->max_payload + IEEE1394_GASP_HDR_SIZE);
 976                 } else {
 977                         skb_pull(skb, ptask->max_payload);
 978                 }
 979                 if (ptask->outstanding_pkts > 1) {
 980                         fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_INTFRAG,
 981                                           dg_size, fg_off, datagram_label);
 982                 } else {
 983                         fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_LASTFRAG,
 984                                           dg_size, fg_off, datagram_label);
 985                         ptask->max_payload = skb->len + RFC2374_FRAG_HDR_SIZE;
 986                 }
 987                 fwnet_send_packet(ptask);
 988         }
 989
 990         if (free)
 991                 fwnet_free_ptask(ptask);
 992 }
 993
 994 static void fwnet_transmit_packet_failed(struct fwnet_packet_task *ptask)
 995 {
 996         struct fwnet_device *dev = ptask->dev;
 997         unsigned long flags;
 998         bool free;
 999
1000         spin_lock_irqsave(&dev->lock, flags);
1001
1002         /* One fragment failed; don't try to send remaining fragments. */
1003         ptask->outstanding_pkts = 0;
1004
1005         /* Check whether we or the networking TX soft-IRQ is last user. */
1006         free = ptask->enqueued;
1007         if (free)
1008                 dec_queued_datagrams(dev);
1009
1010         dev->netdev->stats.tx_dropped++;
1011         dev->netdev->stats.tx_errors++;
1012
1013         spin_unlock_irqrestore(&dev->lock, flags);
1014
1015         if (free)
1016                 fwnet_free_ptask(ptask);
1017 }
1018
1019 static void fwnet_write_complete(struct fw_card *card, int rcode,
1020                                  void *payload, size_t length, void *data)
1021 {
1022         struct fwnet_packet_task *ptask = data;
1023         static unsigned long j;
1024         static int last_rcode, errors_skipped;
1025
1026         if (rcode == RCODE_COMPLETE) {
1027                 fwnet_transmit_packet_done(ptask);
1028         } else {
1029                 fwnet_transmit_packet_failed(ptask);
1030
1031                 if (printk_timed_ratelimit(&j,  1000) || rcode != last_rcode) {
1032                         dev_err(&ptask->dev->netdev->dev,
1033                                 "fwnet_write_complete failed: %x (skipped %d)\n",
1034                                 rcode, errors_skipped);
1035
1036                         errors_skipped = 0;
1037                         last_rcode = rcode;
1038                 } else
1039                         errors_skipped++;
1040         }
1041 }
1042
1043 static int fwnet_send_packet(struct fwnet_packet_task *ptask)
1044 {
1045         struct fwnet_device *dev;
1046         unsigned tx_len;
1047         struct rfc2734_header *bufhdr;
1048         unsigned long flags;
1049         bool free;
1050
1051         dev = ptask->dev;
1052         tx_len = ptask->max_payload;
1053         switch (fwnet_get_hdr_lf(&ptask->hdr)) {
1054         case RFC2374_HDR_UNFRAG:
1055                 bufhdr = (struct rfc2734_header *)
1056                                 skb_push(ptask->skb, RFC2374_UNFRAG_HDR_SIZE);
1057                 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
1058                 break;
1059
1060         case RFC2374_HDR_FIRSTFRAG:
1061         case RFC2374_HDR_INTFRAG:
1062         case RFC2374_HDR_LASTFRAG:
1063                 bufhdr = (struct rfc2734_header *)
1064                                 skb_push(ptask->skb, RFC2374_FRAG_HDR_SIZE);
1065                 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
1066                 put_unaligned_be32(ptask->hdr.w1, &bufhdr->w1);
1067                 break;
1068
1069         default:
1070                 BUG();
1071         }
1072         if (ptask->dest_node == IEEE1394_ALL_NODES) {
1073                 u8 *p;
1074                 int generation;
1075                 int node_id;
1076
1077                 /* ptask->generation may not have been set yet */
1078                 generation = dev->card->generation;
1079                 smp_rmb();
1080                 node_id = dev->card->node_id;
1081
1082                 p = skb_push(ptask->skb, IEEE1394_GASP_HDR_SIZE);
1083                 put_unaligned_be32(node_id << 16 | IANA_SPECIFIER_ID >> 8, p);
1084                 put_unaligned_be32((IANA_SPECIFIER_ID & 0xff) << 24
1085                                                 | RFC2734_SW_VERSION, &p[4]);
1086
1087                 /* We should not transmit if broadcast_channel.valid == 0. */
1088                 fw_send_request(dev->card, &ptask->transaction,
1089                                 TCODE_STREAM_DATA,
1090                                 fw_stream_packet_destination_id(3,
1091                                                 IEEE1394_BROADCAST_CHANNEL, 0),
1092                                 generation, SCODE_100, 0ULL, ptask->skb->data,
1093                                 tx_len + 8, fwnet_write_complete, ptask);
1094
1095                 spin_lock_irqsave(&dev->lock, flags);
1096
1097                 /* If the AT tasklet already ran, we may be last user. */
1098                 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1099                 if (!free)
1100                         ptask->enqueued = true;
1101                 else
1102                         dec_queued_datagrams(dev);
1103
1104                 spin_unlock_irqrestore(&dev->lock, flags);
1105
1106                 goto out;
1107         }
1108
1109         fw_send_request(dev->card, &ptask->transaction,
1110                         TCODE_WRITE_BLOCK_REQUEST, ptask->dest_node,
1111                         ptask->generation, ptask->speed, ptask->fifo_addr,
1112                         ptask->skb->data, tx_len, fwnet_write_complete, ptask);
1113
1114         spin_lock_irqsave(&dev->lock, flags);
1115
1116         /* If the AT tasklet already ran, we may be last user. */
1117         free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1118         if (!free)
1119                 ptask->enqueued = true;
1120         else
1121                 dec_queued_datagrams(dev);
1122
1123         spin_unlock_irqrestore(&dev->lock, flags);
1124
1125         dev->netdev->trans_start = jiffies;
1126  out:
1127         if (free)
1128                 fwnet_free_ptask(ptask);
1129
1130         return 0;
1131 }
1132
1133 static void fwnet_fifo_stop(struct fwnet_device *dev)
1134 {
1135         if (dev->local_fifo == FWNET_NO_FIFO_ADDR)
1136                 return;
1137
1138         fw_core_remove_address_handler(&dev->handler);
1139         dev->local_fifo = FWNET_NO_FIFO_ADDR;
1140 }
1141
1142 static int fwnet_fifo_start(struct fwnet_device *dev)
1143 {
1144         int retval;
1145
1146         if (dev->local_fifo != FWNET_NO_FIFO_ADDR)
1147                 return 0;
1148
1149         dev->handler.length = 4096;
1150         dev->handler.address_callback = fwnet_receive_packet;
1151         dev->handler.callback_data = dev;
1152
1153         retval = fw_core_add_address_handler(&dev->handler,
1154                                              &fw_high_memory_region);
1155         if (retval < 0)
1156                 return retval;
1157
1158         dev->local_fifo = dev->handler.offset;
1159
1160         return 0;
1161 }
1162
1163 static void __fwnet_broadcast_stop(struct fwnet_device *dev)
1164 {
1165         unsigned u;
1166
1167         if (dev->broadcast_state != FWNET_BROADCAST_ERROR) {
1168                 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++)
1169                         kunmap(dev->broadcast_rcv_buffer.pages[u]);
1170                 fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer, dev->card);
1171         }
1172         if (dev->broadcast_rcv_context) {
1173                 fw_iso_context_destroy(dev->broadcast_rcv_context);
1174                 dev->broadcast_rcv_context = NULL;
1175         }
1176         kfree(dev->broadcast_rcv_buffer_ptrs);
1177         dev->broadcast_rcv_buffer_ptrs = NULL;
1178         dev->broadcast_state = FWNET_BROADCAST_ERROR;
1179 }
1180
1181 static void fwnet_broadcast_stop(struct fwnet_device *dev)
1182 {
1183         if (dev->broadcast_state == FWNET_BROADCAST_ERROR)
1184                 return;
1185         fw_iso_context_stop(dev->broadcast_rcv_context);
1186         __fwnet_broadcast_stop(dev);
1187 }
1188
1189 static int fwnet_broadcast_start(struct fwnet_device *dev)
1190 {
1191         struct fw_iso_context *context;
1192         int retval;
1193         unsigned num_packets;
1194         unsigned max_receive;
1195         struct fw_iso_packet packet;
1196         unsigned long offset;
1197         void **ptrptr;
1198         unsigned u;
1199
1200         if (dev->broadcast_state != FWNET_BROADCAST_ERROR)
1201                 return 0;
1202
1203         max_receive = 1U << (dev->card->max_receive + 1);
1204         num_packets = (FWNET_ISO_PAGE_COUNT * PAGE_SIZE) / max_receive;
1205
1206         ptrptr = kmalloc(sizeof(void *) * num_packets, GFP_KERNEL);
1207         if (!ptrptr) {
1208                 retval = -ENOMEM;
1209                 goto failed;
1210         }
1211         dev->broadcast_rcv_buffer_ptrs = ptrptr;
1212
1213         context = fw_iso_context_create(dev->card, FW_ISO_CONTEXT_RECEIVE,
1214                                         IEEE1394_BROADCAST_CHANNEL,
1215                                         dev->card->link_speed, 8,
1216                                         fwnet_receive_broadcast, dev);
1217         if (IS_ERR(context)) {
1218                 retval = PTR_ERR(context);
1219                 goto failed;
1220         }
1221
1222         retval = fw_iso_buffer_init(&dev->broadcast_rcv_buffer, dev->card,
1223                                     FWNET_ISO_PAGE_COUNT, DMA_FROM_DEVICE);
1224         if (retval < 0)
1225                 goto failed;
1226
1227         dev->broadcast_state = FWNET_BROADCAST_STOPPED;
1228
1229         for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++) {
1230                 void *ptr;
1231                 unsigned v;
1232
1233                 ptr = kmap(dev->broadcast_rcv_buffer.pages[u]);
1234                 for (v = 0; v < num_packets / FWNET_ISO_PAGE_COUNT; v++)
1235                         *ptrptr++ = (void *) ((char *)ptr + v * max_receive);
1236         }
1237         dev->broadcast_rcv_context = context;
1238
1239         packet.payload_length = max_receive;
1240         packet.interrupt = 1;
1241         packet.skip = 0;
1242         packet.tag = 3;
1243         packet.sy = 0;
1244         packet.header_length = IEEE1394_GASP_HDR_SIZE;
1245         offset = 0;
1246
1247         for (u = 0; u < num_packets; u++) {
1248                 retval = fw_iso_context_queue(context, &packet,
1249                                 &dev->broadcast_rcv_buffer, offset);
1250                 if (retval < 0)
1251                         goto failed;
1252
1253                 offset += max_receive;
1254         }
1255         dev->num_broadcast_rcv_ptrs = num_packets;
1256         dev->rcv_buffer_size = max_receive;
1257         dev->broadcast_rcv_next_ptr = 0U;
1258         retval = fw_iso_context_start(context, -1, 0,
1259                         FW_ISO_CONTEXT_MATCH_ALL_TAGS); /* ??? sync */
1260         if (retval < 0)
1261                 goto failed;
1262
1263         /* FIXME: adjust it according to the min. speed of all known peers? */
1264         dev->broadcast_xmt_max_payload = IEEE1394_MAX_PAYLOAD_S100
1265                         - IEEE1394_GASP_HDR_SIZE - RFC2374_UNFRAG_HDR_SIZE;
1266         dev->broadcast_state = FWNET_BROADCAST_RUNNING;
1267
1268         return 0;
1269
1270  failed:
1271         __fwnet_broadcast_stop(dev);
1272         return retval;
1273 }
1274
1275 static void set_carrier_state(struct fwnet_device *dev)
1276 {
1277         if (dev->peer_count > 1)
1278                 netif_carrier_on(dev->netdev);
1279         else
1280                 netif_carrier_off(dev->netdev);
1281 }
1282
1283 /* ifup */
1284 static int fwnet_open(struct net_device *net)
1285 {
1286         struct fwnet_device *dev = netdev_priv(net);
1287         int ret;
1288
1289         ret = fwnet_fifo_start(dev);
1290         if (ret)
1291                 return ret;
1292
1293         ret = fwnet_broadcast_start(dev);
1294         if (ret)
1295                 goto out;
1296
1297         netif_start_queue(net);
1298
1299         spin_lock_irq(&dev->lock);
1300         set_carrier_state(dev);
1301         spin_unlock_irq(&dev->lock);
1302
1303         return 0;
1304 out:
1305         fwnet_fifo_stop(dev);
1306         return ret;
1307 }
1308
1309 /* ifdown */
1310 static int fwnet_stop(struct net_device *net)
1311 {
1312         struct fwnet_device *dev = netdev_priv(net);
1313
1314         netif_stop_queue(net);
1315
1316         fwnet_broadcast_stop(dev);
1317         fwnet_fifo_stop(dev);
1318
1319         return 0;
1320 }
1321
1322 static netdev_tx_t fwnet_tx(struct sk_buff *skb, struct net_device *net)
1323 {
1324         struct fwnet_header hdr_buf;
1325         struct fwnet_device *dev = netdev_priv(net);
1326         __be16 proto;
1327         u16 dest_node;
1328         unsigned max_payload;
1329         u16 dg_size;
1330         u16 *datagram_label_ptr;
1331         struct fwnet_packet_task *ptask;
1332         struct fwnet_peer *peer;
1333         unsigned long flags;
1334
1335         spin_lock_irqsave(&dev->lock, flags);
1336
1337         /* Can this happen? */
1338         if (netif_queue_stopped(dev->netdev)) {
1339                 spin_unlock_irqrestore(&dev->lock, flags);
1340
1341                 return NETDEV_TX_BUSY;
1342         }
1343
1344         ptask = kmem_cache_alloc(fwnet_packet_task_cache, GFP_ATOMIC);
1345         if (ptask == NULL)
1346                 goto fail;
1347
1348         skb = skb_share_check(skb, GFP_ATOMIC);
1349         if (!skb)
1350                 goto fail;
1351
1352         /*
1353          * Make a copy of the driver-specific header.
1354          * We might need to rebuild the header on tx failure.
1355          */
1356         memcpy(&hdr_buf, skb->data, sizeof(hdr_buf));
1357         proto = hdr_buf.h_proto;
1358
1359         switch (proto) {
1360         case htons(ETH_P_ARP):
1361         case htons(ETH_P_IP):
1362                 break;
1363         default:
1364                 goto fail;
1365         }
1366
1367         skb_pull(skb, sizeof(hdr_buf));
1368         dg_size = skb->len;
1369
1370         /*
1371          * Set the transmission type for the packet.  ARP packets and IP
1372          * broadcast packets are sent via GASP.
1373          */
1374         if (fwnet_hwaddr_is_multicast(hdr_buf.h_dest)) {
1375                 max_payload        = dev->broadcast_xmt_max_payload;
1376                 datagram_label_ptr = &dev->broadcast_xmt_datagramlabel;
1377
1378                 ptask->fifo_addr   = FWNET_NO_FIFO_ADDR;
1379                 ptask->generation  = 0;
1380                 ptask->dest_node   = IEEE1394_ALL_NODES;
1381                 ptask->speed       = SCODE_100;
1382         } else {
1383                 __be64 guid = get_unaligned((__be64 *)hdr_buf.h_dest);
1384                 u8 generation;
1385
1386                 peer = fwnet_peer_find_by_guid(dev, be64_to_cpu(guid));
1387                 if (!peer || peer->fifo == FWNET_NO_FIFO_ADDR)
1388                         goto fail;
1389
1390                 generation         = peer->generation;
1391                 dest_node          = peer->node_id;
1392                 max_payload        = peer->max_payload;
1393                 datagram_label_ptr = &peer->datagram_label;
1394
1395                 ptask->fifo_addr   = peer->fifo;
1396                 ptask->generation  = generation;
1397                 ptask->dest_node   = dest_node;
1398                 ptask->speed       = peer->speed;
1399         }
1400
1401         /* If this is an ARP packet, convert it */
1402         if (proto == htons(ETH_P_ARP)) {
1403                 struct arphdr *arp = (struct arphdr *)skb->data;
1404                 unsigned char *arp_ptr = (unsigned char *)(arp + 1);
1405                 struct rfc2734_arp *arp1394 = (struct rfc2734_arp *)skb->data;
1406                 __be32 ipaddr;
1407
1408                 ipaddr = get_unaligned((__be32 *)(arp_ptr + FWNET_ALEN));
1409
1410                 arp1394->hw_addr_len    = RFC2734_HW_ADDR_LEN;
1411                 arp1394->max_rec        = dev->card->max_receive;
1412                 arp1394->sspd           = dev->card->link_speed;
1413
1414                 put_unaligned_be16(dev->local_fifo >> 32,
1415                                    &arp1394->fifo_hi);
1416                 put_unaligned_be32(dev->local_fifo & 0xffffffff,
1417                                    &arp1394->fifo_lo);
1418                 put_unaligned(ipaddr, &arp1394->sip);
1419         }
1420
1421         ptask->hdr.w0 = 0;
1422         ptask->hdr.w1 = 0;
1423         ptask->skb = skb;
1424         ptask->dev = dev;
1425
1426         /* Does it all fit in one packet? */
1427         if (dg_size <= max_payload) {
1428                 fwnet_make_uf_hdr(&ptask->hdr, ntohs(proto));
1429                 ptask->outstanding_pkts = 1;
1430                 max_payload = dg_size + RFC2374_UNFRAG_HDR_SIZE;
1431         } else {
1432                 u16 datagram_label;
1433
1434                 max_payload -= RFC2374_FRAG_OVERHEAD;
1435                 datagram_label = (*datagram_label_ptr)++;
1436                 fwnet_make_ff_hdr(&ptask->hdr, ntohs(proto), dg_size,
1437                                   datagram_label);
1438                 ptask->outstanding_pkts = DIV_ROUND_UP(dg_size, max_payload);
1439                 max_payload += RFC2374_FRAG_HDR_SIZE;
1440         }
1441
1442         if (++dev->queued_datagrams == FWNET_MAX_QUEUED_DATAGRAMS)
1443                 netif_stop_queue(dev->netdev);
1444
1445         spin_unlock_irqrestore(&dev->lock, flags);
1446
1447         ptask->max_payload = max_payload;
1448         ptask->enqueued    = 0;
1449
1450         fwnet_send_packet(ptask);
1451
1452         return NETDEV_TX_OK;
1453
1454  fail:
1455         spin_unlock_irqrestore(&dev->lock, flags);
1456
1457         if (ptask)
1458                 kmem_cache_free(fwnet_packet_task_cache, ptask);
1459
1460         if (skb != NULL)
1461                 dev_kfree_skb(skb);
1462
1463         net->stats.tx_dropped++;
1464         net->stats.tx_errors++;
1465
1466         /*
1467          * FIXME: According to a patch from 2003-02-26, "returning non-zero
1468          * causes serious problems" here, allegedly.  Before that patch,
1469          * -ERRNO was returned which is not appropriate under Linux 2.6.
1470          * Perhaps more needs to be done?  Stop the queue in serious
1471          * conditions and restart it elsewhere?
1472          */
1473         return NETDEV_TX_OK;
1474 }
1475
1476 static int fwnet_change_mtu(struct net_device *net, int new_mtu)
1477 {
1478         if (new_mtu < 68)
1479                 return -EINVAL;
1480
1481         net->mtu = new_mtu;
1482         return 0;
1483 }
1484
1485 static const struct ethtool_ops fwnet_ethtool_ops = {
1486         .get_link       = ethtool_op_get_link,
1487 };
1488
1489 static const struct net_device_ops fwnet_netdev_ops = {
1490         .ndo_open       = fwnet_open,
1491         .ndo_stop       = fwnet_stop,
1492         .ndo_start_xmit = fwnet_tx,
1493         .ndo_change_mtu = fwnet_change_mtu,
1494 };
1495
1496 static void fwnet_init_dev(struct net_device *net)
1497 {
1498         net->header_ops         = &fwnet_header_ops;
1499         net->netdev_ops         = &fwnet_netdev_ops;
1500         net->watchdog_timeo     = 2 * HZ;
1501         net->flags              = IFF_BROADCAST | IFF_MULTICAST;
1502         net->features           = NETIF_F_HIGHDMA;
1503         net->addr_len           = FWNET_ALEN;
1504         net->hard_header_len    = FWNET_HLEN;
1505         net->type               = ARPHRD_IEEE1394;
1506         net->tx_queue_len       = FWNET_TX_QUEUE_LEN;
1507         net->ethtool_ops        = &fwnet_ethtool_ops;
1508 }
1509
1510 /* caller must hold fwnet_device_mutex */
1511 static struct fwnet_device *fwnet_dev_find(struct fw_card *card)
1512 {
1513         struct fwnet_device *dev;
1514
1515         list_for_each_entry(dev, &fwnet_device_list, dev_link)
1516                 if (dev->card == card)
1517                         return dev;
1518
1519         return NULL;
1520 }
1521
1522 static int fwnet_add_peer(struct fwnet_device *dev,
1523                           struct fw_unit *unit, struct fw_device *device)
1524 {
1525         struct fwnet_peer *peer;
1526
1527         peer = kmalloc(sizeof(*peer), GFP_KERNEL);
1528         if (!peer)
1529                 return -ENOMEM;
1530
1531         dev_set_drvdata(&unit->device, peer);
1532
1533         peer->dev = dev;
1534         peer->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4];
1535         peer->fifo = FWNET_NO_FIFO_ADDR;
1536         peer->ip = 0;
1537         INIT_LIST_HEAD(&peer->pd_list);
1538         peer->pdg_size = 0;
1539         peer->datagram_label = 0;
1540         peer->speed = device->max_speed;
1541         peer->max_payload = fwnet_max_payload(device->max_rec, peer->speed);
1542
1543         peer->generation = device->generation;
1544         smp_rmb();
1545         peer->node_id = device->node_id;
1546
1547         spin_lock_irq(&dev->lock);
1548         list_add_tail(&peer->peer_link, &dev->peer_list);
1549         dev->peer_count++;
1550         set_carrier_state(dev);
1551         spin_unlock_irq(&dev->lock);
1552
1553         return 0;
1554 }
1555
1556 static int fwnet_probe(struct device *_dev)
1557 {
1558         struct fw_unit *unit = fw_unit(_dev);
1559         struct fw_device *device = fw_parent_device(unit);
1560         struct fw_card *card = device->card;
1561         struct net_device *net;
1562         bool allocated_netdev = false;
1563         struct fwnet_device *dev;
1564         unsigned max_mtu;
1565         int ret;
1566
1567         mutex_lock(&fwnet_device_mutex);
1568
1569         dev = fwnet_dev_find(card);
1570         if (dev) {
1571                 net = dev->netdev;
1572                 goto have_dev;
1573         }
1574
1575         net = alloc_netdev(sizeof(*dev), "firewire%d", fwnet_init_dev);
1576         if (net == NULL) {
1577                 ret = -ENOMEM;
1578                 goto out;
1579         }
1580
1581         allocated_netdev = true;
1582         SET_NETDEV_DEV(net, card->device);
1583         dev = netdev_priv(net);
1584
1585         spin_lock_init(&dev->lock);
1586         dev->broadcast_state = FWNET_BROADCAST_ERROR;
1587         dev->broadcast_rcv_context = NULL;
1588         dev->broadcast_xmt_max_payload = 0;
1589         dev->broadcast_xmt_datagramlabel = 0;
1590         dev->local_fifo = FWNET_NO_FIFO_ADDR;
1591         dev->queued_datagrams = 0;
1592         INIT_LIST_HEAD(&dev->peer_list);
1593         dev->card = card;
1594         dev->netdev = net;
1595
1596         /*
1597          * Use the RFC 2734 default 1500 octets or the maximum payload
1598          * as initial MTU
1599          */
1600         max_mtu = (1 << (card->max_receive + 1))
1601                   - sizeof(struct rfc2734_header) - IEEE1394_GASP_HDR_SIZE;
1602         net->mtu = min(1500U, max_mtu);
1603
1604         /* Set our hardware address while we're at it */
1605         put_unaligned_be64(card->guid, net->dev_addr);
1606         put_unaligned_be64(~0ULL, net->broadcast);
1607         ret = register_netdev(net);
1608         if (ret)
1609                 goto out;
1610
1611         list_add_tail(&dev->dev_link, &fwnet_device_list);
1612         dev_notice(&net->dev, "IPv4 over IEEE 1394 on card %s\n",
1613                    dev_name(card->device));
1614  have_dev:
1615         ret = fwnet_add_peer(dev, unit, device);
1616         if (ret && allocated_netdev) {
1617                 unregister_netdev(net);
1618                 list_del(&dev->dev_link);
1619         }
1620  out:
1621         if (ret && allocated_netdev)
1622                 free_netdev(net);
1623
1624         mutex_unlock(&fwnet_device_mutex);
1625
1626         return ret;
1627 }
1628
1629 static void fwnet_remove_peer(struct fwnet_peer *peer, struct fwnet_device *dev)
1630 {
1631         struct fwnet_partial_datagram *pd, *pd_next;
1632
1633         spin_lock_irq(&dev->lock);
1634         list_del(&peer->peer_link);
1635         dev->peer_count--;
1636         set_carrier_state(dev);
1637         spin_unlock_irq(&dev->lock);
1638
1639         list_for_each_entry_safe(pd, pd_next, &peer->pd_list, pd_link)
1640                 fwnet_pd_delete(pd);
1641
1642         kfree(peer);
1643 }
1644
1645 static int fwnet_remove(struct device *_dev)
1646 {
1647         struct fwnet_peer *peer = dev_get_drvdata(_dev);
1648         struct fwnet_device *dev = peer->dev;
1649         struct net_device *net;
1650         int i;
1651
1652         mutex_lock(&fwnet_device_mutex);
1653
1654         net = dev->netdev;
1655         if (net && peer->ip)
1656                 arp_invalidate(net, peer->ip);
1657
1658         fwnet_remove_peer(peer, dev);
1659
1660         if (list_empty(&dev->peer_list)) {
1661                 unregister_netdev(net);
1662
1663                 for (i = 0; dev->queued_datagrams && i < 5; i++)
1664                         ssleep(1);
1665                 WARN_ON(dev->queued_datagrams);
1666                 list_del(&dev->dev_link);
1667
1668                 free_netdev(net);
1669         }
1670
1671         mutex_unlock(&fwnet_device_mutex);
1672
1673         return 0;
1674 }
1675
1676 /*
1677  * FIXME abort partially sent fragmented datagrams,
1678  * discard partially received fragmented datagrams
1679  */
1680 static void fwnet_update(struct fw_unit *unit)
1681 {
1682         struct fw_device *device = fw_parent_device(unit);
1683         struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1684         int generation;
1685
1686         generation = device->generation;
1687
1688         spin_lock_irq(&peer->dev->lock);
1689         peer->node_id    = device->node_id;
1690         peer->generation = generation;
1691         spin_unlock_irq(&peer->dev->lock);
1692 }
1693
1694 static const struct ieee1394_device_id fwnet_id_table[] = {
1695         {
1696                 .match_flags  = IEEE1394_MATCH_SPECIFIER_ID |
1697                                 IEEE1394_MATCH_VERSION,
1698                 .specifier_id = IANA_SPECIFIER_ID,
1699                 .version      = RFC2734_SW_VERSION,
1700         },
1701         { }
1702 };
1703
1704 static struct fw_driver fwnet_driver = {
1705         .driver = {
1706                 .owner  = THIS_MODULE,
1707                 .name   = KBUILD_MODNAME,
1708                 .bus    = &fw_bus_type,
1709                 .probe  = fwnet_probe,
1710                 .remove = fwnet_remove,
1711         },
1712         .update   = fwnet_update,
1713         .id_table = fwnet_id_table,
1714 };
1715
1716 static const u32 rfc2374_unit_directory_data[] = {
1717         0x00040000,     /* directory_length             */
1718         0x1200005e,     /* unit_specifier_id: IANA      */
1719         0x81000003,     /* textual descriptor offset    */
1720         0x13000001,     /* unit_sw_version: RFC 2734    */
1721         0x81000005,     /* textual descriptor offset    */
1722         0x00030000,     /* descriptor_length            */
1723         0x00000000,     /* text                         */
1724         0x00000000,     /* minimal ASCII, en            */
1725         0x49414e41,     /* I A N A                      */
1726         0x00030000,     /* descriptor_length            */
1727         0x00000000,     /* text                         */
1728         0x00000000,     /* minimal ASCII, en            */
1729         0x49507634,     /* I P v 4                      */
1730 };
1731
1732 static struct fw_descriptor rfc2374_unit_directory = {
1733         .length = ARRAY_SIZE(rfc2374_unit_directory_data),
1734         .key    = (CSR_DIRECTORY | CSR_UNIT) << 24,
1735         .data   = rfc2374_unit_directory_data
1736 };
1737
1738 static int __init fwnet_init(void)
1739 {
1740         int err;
1741
1742         err = fw_core_add_descriptor(&rfc2374_unit_directory);
1743         if (err)
1744                 return err;
1745
1746         fwnet_packet_task_cache = kmem_cache_create("packet_task",
1747                         sizeof(struct fwnet_packet_task), 0, 0, NULL);
1748         if (!fwnet_packet_task_cache) {
1749                 err = -ENOMEM;
1750                 goto out;
1751         }
1752
1753         err = driver_register(&fwnet_driver.driver);
1754         if (!err)
1755                 return 0;
1756
1757         kmem_cache_destroy(fwnet_packet_task_cache);
1758 out:
1759         fw_core_remove_descriptor(&rfc2374_unit_directory);
1760
1761         return err;
1762 }
1763 module_init(fwnet_init);
1764
1765 static void __exit fwnet_cleanup(void)
1766 {
1767         driver_unregister(&fwnet_driver.driver);
1768         kmem_cache_destroy(fwnet_packet_task_cache);
1769         fw_core_remove_descriptor(&rfc2374_unit_directory);
1770 }
1771 module_exit(fwnet_cleanup);
1772
1773 MODULE_AUTHOR("Jay Fenlason <fenlason@redhat.com>");
1774 MODULE_DESCRIPTION("IPv4 over IEEE1394 as per RFC 2734");
1775 MODULE_LICENSE("GPL");
1776 MODULE_DEVICE_TABLE(ieee1394, fwnet_id_table);