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/delay.h>
  11 #include <linux/device.h>
  12 #include <linux/ethtool.h>
  13 #include <linux/firewire.h>
  14 #include <linux/firewire-constants.h>
  15 #include <linux/highmem.h>
  16 #include <linux/in.h>
  17 #include <linux/ip.h>
  18 #include <linux/jiffies.h>
  19 #include <linux/mod_devicetable.h>
  20 #include <linux/module.h>
  21 #include <linux/moduleparam.h>
  22 #include <linux/mutex.h>
  23 #include <linux/netdevice.h>
  24 #include <linux/skbuff.h>
  25 #include <linux/slab.h>
  26 #include <linux/spinlock.h>
  27
  28 #include <asm/unaligned.h>
  29 #include <net/arp.h>
  30
  31 /* rx limits */
  32 #define FWNET_MAX_FRAGMENTS             30 /* arbitrary, > TX queue depth */
  33 #define FWNET_ISO_PAGE_COUNT            (PAGE_SIZE < 16*1024 ? 4 : 2)
  34
  35 /* tx limits */
  36 #define FWNET_MAX_QUEUED_DATAGRAMS      20 /* < 64 = number of tlabels */
  37 #define FWNET_MIN_QUEUED_DATAGRAMS      10 /* should keep AT DMA busy enough */
  38 #define FWNET_TX_QUEUE_LEN              FWNET_MAX_QUEUED_DATAGRAMS /* ? */
  39
  40 #define IEEE1394_BROADCAST_CHANNEL      31
  41 #define IEEE1394_ALL_NODES              (0xffc0 | 0x003f)
  42 #define IEEE1394_MAX_PAYLOAD_S100       512
  43 #define FWNET_NO_FIFO_ADDR              (~0ULL)
  44
  45 #define IANA_SPECIFIER_ID               0x00005eU
  46 #define RFC2734_SW_VERSION              0x000001U
  47
  48 #define IEEE1394_GASP_HDR_SIZE  8
  49
  50 #define RFC2374_UNFRAG_HDR_SIZE 4
  51 #define RFC2374_FRAG_HDR_SIZE   8
  52 #define RFC2374_FRAG_OVERHEAD   4
  53
  54 #define RFC2374_HDR_UNFRAG      0       /* unfragmented         */
  55 #define RFC2374_HDR_FIRSTFRAG   1       /* first fragment       */
  56 #define RFC2374_HDR_LASTFRAG    2       /* last fragment        */
  57 #define RFC2374_HDR_INTFRAG     3       /* interior fragment    */
  58
  59 #define RFC2734_HW_ADDR_LEN     16
  60
  61 struct rfc2734_arp {
  62         __be16 hw_type;         /* 0x0018       */
  63         __be16 proto_type;      /* 0x0806       */
  64         u8 hw_addr_len;         /* 16           */
  65         u8 ip_addr_len;         /* 4            */
  66         __be16 opcode;          /* ARP Opcode   */
  67         /* Above is exactly the same format as struct arphdr */
  68
  69         __be64 s_uniq_id;       /* Sender's 64bit EUI                   */
  70         u8 max_rec;             /* Sender's max packet size             */
  71         u8 sspd;                /* Sender's max speed                   */
  72         __be16 fifo_hi;         /* hi 16bits of sender's FIFO addr      */
  73         __be32 fifo_lo;         /* lo 32bits of sender's FIFO addr      */
  74         __be32 sip;             /* Sender's IP Address                  */
  75         __be32 tip;             /* IP Address of requested hw addr      */
  76 } __attribute__((packed));
  77
  78 /* This header format is specific to this driver implementation. */
  79 #define FWNET_ALEN      8
  80 #define FWNET_HLEN      10
  81 struct fwnet_header {
  82         u8 h_dest[FWNET_ALEN];  /* destination address */
  83         __be16 h_proto;         /* packet type ID field */
  84 } __attribute__((packed));
  85
  86 /* IPv4 and IPv6 encapsulation header */
  87 struct rfc2734_header {
  88         u32 w0;
  89         u32 w1;
  90 };
  91
  92 #define fwnet_get_hdr_lf(h)             (((h)->w0 & 0xc0000000) >> 30)
  93 #define fwnet_get_hdr_ether_type(h)     (((h)->w0 & 0x0000ffff))
  94 #define fwnet_get_hdr_dg_size(h)        (((h)->w0 & 0x0fff0000) >> 16)
  95 #define fwnet_get_hdr_fg_off(h)         (((h)->w0 & 0x00000fff))
  96 #define fwnet_get_hdr_dgl(h)            (((h)->w1 & 0xffff0000) >> 16)
  97
  98 #define fwnet_set_hdr_lf(lf)            ((lf)  << 30)
  99 #define fwnet_set_hdr_ether_type(et)    (et)
 100 #define fwnet_set_hdr_dg_size(dgs)      ((dgs) << 16)
 101 #define fwnet_set_hdr_fg_off(fgo)       (fgo)
 102
 103 #define fwnet_set_hdr_dgl(dgl)          ((dgl) << 16)
 104
 105 static inline void fwnet_make_uf_hdr(struct rfc2734_header *hdr,
 106                 unsigned ether_type)
 107 {
 108         hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_UNFRAG)
 109                   | fwnet_set_hdr_ether_type(ether_type);
 110 }
 111
 112 static inline void fwnet_make_ff_hdr(struct rfc2734_header *hdr,
 113                 unsigned ether_type, unsigned dg_size, unsigned dgl)
 114 {
 115         hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_FIRSTFRAG)
 116                   | fwnet_set_hdr_dg_size(dg_size)
 117                   | fwnet_set_hdr_ether_type(ether_type);
 118         hdr->w1 = fwnet_set_hdr_dgl(dgl);
 119 }
 120
 121 static inline void fwnet_make_sf_hdr(struct rfc2734_header *hdr,
 122                 unsigned lf, unsigned dg_size, unsigned fg_off, unsigned dgl)
 123 {
 124         hdr->w0 = fwnet_set_hdr_lf(lf)
 125                   | fwnet_set_hdr_dg_size(dg_size)
 126                   | fwnet_set_hdr_fg_off(fg_off);
 127         hdr->w1 = fwnet_set_hdr_dgl(dgl);
 128 }
 129
 130 /* This list keeps track of what parts of the datagram have been filled in */
 131 struct fwnet_fragment_info {
 132         struct list_head fi_link;
 133         u16 offset;
 134         u16 len;
 135 };
 136
 137 struct fwnet_partial_datagram {
 138         struct list_head pd_link;
 139         struct list_head fi_list;
 140         struct sk_buff *skb;
 141         /* FIXME Why not use skb->data? */
 142         char *pbuf;
 143         u16 datagram_label;
 144         u16 ether_type;
 145         u16 datagram_size;
 146 };
 147
 148 static DEFINE_MUTEX(fwnet_device_mutex);
 149 static LIST_HEAD(fwnet_device_list);
 150
 151 struct fwnet_device {
 152         struct list_head dev_link;
 153         spinlock_t lock;
 154         enum {
 155                 FWNET_BROADCAST_ERROR,
 156                 FWNET_BROADCAST_RUNNING,
 157                 FWNET_BROADCAST_STOPPED,
 158         } broadcast_state;
 159         struct fw_iso_context *broadcast_rcv_context;
 160         struct fw_iso_buffer broadcast_rcv_buffer;
 161         void **broadcast_rcv_buffer_ptrs;
 162         unsigned broadcast_rcv_next_ptr;
 163         unsigned num_broadcast_rcv_ptrs;
 164         unsigned rcv_buffer_size;
 165         /*
 166          * This value is the maximum unfragmented datagram size that can be
 167          * sent by the hardware.  It already has the GASP overhead and the
 168          * unfragmented datagram header overhead calculated into it.
 169          */
 170         unsigned broadcast_xmt_max_payload;
 171         u16 broadcast_xmt_datagramlabel;
 172
 173         /*
 174          * The CSR address that remote nodes must send datagrams to for us to
 175          * receive them.
 176          */
 177         struct fw_address_handler handler;
 178         u64 local_fifo;
 179
 180         /* Number of tx datagrams that have been queued but not yet acked */
 181         int queued_datagrams;
 182
 183         int peer_count;
 184         struct list_head peer_list;
 185         struct fw_card *card;
 186         struct net_device *netdev;
 187 };
 188
 189 struct fwnet_peer {
 190         struct list_head peer_link;
 191         struct fwnet_device *dev;
 192         u64 guid;
 193         u64 fifo;
 194         __be32 ip;
 195
 196         /* guarded by dev->lock */
 197         struct list_head pd_list; /* received partial datagrams */
 198         unsigned pdg_size;        /* pd_list size */
 199
 200         u16 datagram_label;       /* outgoing datagram label */
 201         u16 max_payload;          /* includes RFC2374_FRAG_HDR_SIZE overhead */
 202         int node_id;
 203         int generation;
 204         unsigned speed;
 205 };
 206
 207 /* This is our task struct. It's used for the packet complete callback.  */
 208 struct fwnet_packet_task {
 209         struct fw_transaction transaction;
 210         struct rfc2734_header hdr;
 211         struct sk_buff *skb;
 212         struct fwnet_device *dev;
 213
 214         int outstanding_pkts;
 215         u64 fifo_addr;
 216         u16 dest_node;
 217         u16 max_payload;
 218         u8 generation;
 219         u8 speed;
 220         u8 enqueued;
 221 };
 222
 223 /*
 224  * saddr == NULL means use device source address.
 225  * daddr == NULL means leave destination address (eg unresolved arp).
 226  */
 227 static int fwnet_header_create(struct sk_buff *skb, struct net_device *net,
 228                         unsigned short type, const void *daddr,
 229                         const void *saddr, unsigned len)
 230 {
 231         struct fwnet_header *h;
 232
 233         h = (struct fwnet_header *)skb_push(skb, sizeof(*h));
 234         put_unaligned_be16(type, &h->h_proto);
 235
 236         if (net->flags & (IFF_LOOPBACK | IFF_NOARP)) {
 237                 memset(h->h_dest, 0, net->addr_len);
 238
 239                 return net->hard_header_len;
 240         }
 241
 242         if (daddr) {
 243                 memcpy(h->h_dest, daddr, net->addr_len);
 244
 245                 return net->hard_header_len;
 246         }
 247
 248         return -net->hard_header_len;
 249 }
 250
 251 static int fwnet_header_rebuild(struct sk_buff *skb)
 252 {
 253         struct fwnet_header *h = (struct fwnet_header *)skb->data;
 254
 255         if (get_unaligned_be16(&h->h_proto) == ETH_P_IP)
 256                 return arp_find((unsigned char *)&h->h_dest, skb);
 257
 258         fw_notify("%s: unable to resolve type %04x addresses\n",
 259                   skb->dev->name, be16_to_cpu(h->h_proto));
 260         return 0;
 261 }
 262
 263 static int fwnet_header_cache(const struct neighbour *neigh,
 264                               struct hh_cache *hh)
 265 {
 266         struct net_device *net;
 267         struct fwnet_header *h;
 268
 269         if (hh->hh_type == cpu_to_be16(ETH_P_802_3))
 270                 return -1;
 271         net = neigh->dev;
 272         h = (struct fwnet_header *)((u8 *)hh->hh_data + 16 - sizeof(*h));
 273         h->h_proto = hh->hh_type;
 274         memcpy(h->h_dest, neigh->ha, net->addr_len);
 275         hh->hh_len = FWNET_HLEN;
 276
 277         return 0;
 278 }
 279
 280 /* Called by Address Resolution module to notify changes in address. */
 281 static void fwnet_header_cache_update(struct hh_cache *hh,
 282                 const struct net_device *net, const unsigned char *haddr)
 283 {
 284         memcpy((u8 *)hh->hh_data + 16 - FWNET_HLEN, haddr, net->addr_len);
 285 }
 286
 287 static int fwnet_header_parse(const struct sk_buff *skb, unsigned char *haddr)
 288 {
 289         memcpy(haddr, skb->dev->dev_addr, FWNET_ALEN);
 290
 291         return FWNET_ALEN;
 292 }
 293
 294 static const struct header_ops fwnet_header_ops = {
 295         .create         = fwnet_header_create,
 296         .rebuild        = fwnet_header_rebuild,
 297         .cache          = fwnet_header_cache,
 298         .cache_update   = fwnet_header_cache_update,
 299         .parse          = fwnet_header_parse,
 300 };
 301
 302 /* FIXME: is this correct for all cases? */
 303 static bool fwnet_frag_overlap(struct fwnet_partial_datagram *pd,
 304                                unsigned offset, unsigned len)
 305 {
 306         struct fwnet_fragment_info *fi;
 307         unsigned end = offset + len;
 308
 309         list_for_each_entry(fi, &pd->fi_list, fi_link)
 310                 if (offset < fi->offset + fi->len && end > fi->offset)
 311                         return true;
 312
 313         return false;
 314 }
 315
 316 /* Assumes that new fragment does not overlap any existing fragments */
 317 static struct fwnet_fragment_info *fwnet_frag_new(
 318         struct fwnet_partial_datagram *pd, unsigned offset, unsigned len)
 319 {
 320         struct fwnet_fragment_info *fi, *fi2, *new;
 321         struct list_head *list;
 322
 323         list = &pd->fi_list;
 324         list_for_each_entry(fi, &pd->fi_list, fi_link) {
 325                 if (fi->offset + fi->len == offset) {
 326                         /* The new fragment can be tacked on to the end */
 327                         /* Did the new fragment plug a hole? */
 328                         fi2 = list_entry(fi->fi_link.next,
 329                                          struct fwnet_fragment_info, fi_link);
 330                         if (fi->offset + fi->len == fi2->offset) {
 331                                 /* glue fragments together */
 332                                 fi->len += len + fi2->len;
 333                                 list_del(&fi2->fi_link);
 334                                 kfree(fi2);
 335                         } else {
 336                                 fi->len += len;
 337                         }
 338
 339                         return fi;
 340                 }
 341                 if (offset + len == fi->offset) {
 342                         /* The new fragment can be tacked on to the beginning */
 343                         /* Did the new fragment plug a hole? */
 344                         fi2 = list_entry(fi->fi_link.prev,
 345                                          struct fwnet_fragment_info, fi_link);
 346                         if (fi2->offset + fi2->len == fi->offset) {
 347                                 /* glue fragments together */
 348                                 fi2->len += fi->len + len;
 349                                 list_del(&fi->fi_link);
 350                                 kfree(fi);
 351
 352                                 return fi2;
 353                         }
 354                         fi->offset = offset;
 355                         fi->len += len;
 356
 357                         return fi;
 358                 }
 359                 if (offset > fi->offset + fi->len) {
 360                         list = &fi->fi_link;
 361                         break;
 362                 }
 363                 if (offset + len < fi->offset) {
 364                         list = fi->fi_link.prev;
 365                         break;
 366                 }
 367         }
 368
 369         new = kmalloc(sizeof(*new), GFP_ATOMIC);
 370         if (!new) {
 371                 fw_error("out of memory\n");
 372                 return NULL;
 373         }
 374
 375         new->offset = offset;
 376         new->len = len;
 377         list_add(&new->fi_link, list);
 378
 379         return new;
 380 }
 381
 382 static struct fwnet_partial_datagram *fwnet_pd_new(struct net_device *net,
 383                 struct fwnet_peer *peer, u16 datagram_label, unsigned dg_size,
 384                 void *frag_buf, unsigned frag_off, unsigned frag_len)
 385 {
 386         struct fwnet_partial_datagram *new;
 387         struct fwnet_fragment_info *fi;
 388
 389         new = kmalloc(sizeof(*new), GFP_ATOMIC);
 390         if (!new)
 391                 goto fail;
 392
 393         INIT_LIST_HEAD(&new->fi_list);
 394         fi = fwnet_frag_new(new, frag_off, frag_len);
 395         if (fi == NULL)
 396                 goto fail_w_new;
 397
 398         new->datagram_label = datagram_label;
 399         new->datagram_size = dg_size;
 400         new->skb = dev_alloc_skb(dg_size + net->hard_header_len + 15);
 401         if (new->skb == NULL)
 402                 goto fail_w_fi;
 403
 404         skb_reserve(new->skb, (net->hard_header_len + 15) & ~15);
 405         new->pbuf = skb_put(new->skb, dg_size);
 406         memcpy(new->pbuf + frag_off, frag_buf, frag_len);
 407         list_add_tail(&new->pd_link, &peer->pd_list);
 408
 409         return new;
 410
 411 fail_w_fi:
 412         kfree(fi);
 413 fail_w_new:
 414         kfree(new);
 415 fail:
 416         fw_error("out of memory\n");
 417
 418         return NULL;
 419 }
 420
 421 static struct fwnet_partial_datagram *fwnet_pd_find(struct fwnet_peer *peer,
 422                                                     u16 datagram_label)
 423 {
 424         struct fwnet_partial_datagram *pd;
 425
 426         list_for_each_entry(pd, &peer->pd_list, pd_link)
 427                 if (pd->datagram_label == datagram_label)
 428                         return pd;
 429
 430         return NULL;
 431 }
 432
 433
 434 static void fwnet_pd_delete(struct fwnet_partial_datagram *old)
 435 {
 436         struct fwnet_fragment_info *fi, *n;
 437
 438         list_for_each_entry_safe(fi, n, &old->fi_list, fi_link)
 439                 kfree(fi);
 440
 441         list_del(&old->pd_link);
 442         dev_kfree_skb_any(old->skb);
 443         kfree(old);
 444 }
 445
 446 static bool fwnet_pd_update(struct fwnet_peer *peer,
 447                 struct fwnet_partial_datagram *pd, void *frag_buf,
 448                 unsigned frag_off, unsigned frag_len)
 449 {
 450         if (fwnet_frag_new(pd, frag_off, frag_len) == NULL)
 451                 return false;
 452
 453         memcpy(pd->pbuf + frag_off, frag_buf, frag_len);
 454
 455         /*
 456          * Move list entry to beginnig of list so that oldest partial
 457          * datagrams percolate to the end of the list
 458          */
 459         list_move_tail(&pd->pd_link, &peer->pd_list);
 460
 461         return true;
 462 }
 463
 464 static bool fwnet_pd_is_complete(struct fwnet_partial_datagram *pd)
 465 {
 466         struct fwnet_fragment_info *fi;
 467
 468         fi = list_entry(pd->fi_list.next, struct fwnet_fragment_info, fi_link);
 469
 470         return fi->len == pd->datagram_size;
 471 }
 472
 473 /* caller must hold dev->lock */
 474 static struct fwnet_peer *fwnet_peer_find_by_guid(struct fwnet_device *dev,
 475                                                   u64 guid)
 476 {
 477         struct fwnet_peer *peer;
 478
 479         list_for_each_entry(peer, &dev->peer_list, peer_link)
 480                 if (peer->guid == guid)
 481                         return peer;
 482
 483         return NULL;
 484 }
 485
 486 /* caller must hold dev->lock */
 487 static struct fwnet_peer *fwnet_peer_find_by_node_id(struct fwnet_device *dev,
 488                                                 int node_id, int generation)
 489 {
 490         struct fwnet_peer *peer;
 491
 492         list_for_each_entry(peer, &dev->peer_list, peer_link)
 493                 if (peer->node_id    == node_id &&
 494                     peer->generation == generation)
 495                         return peer;
 496
 497         return NULL;
 498 }
 499
 500 /* See IEEE 1394-2008 table 6-4, table 8-8, table 16-18. */
 501 static unsigned fwnet_max_payload(unsigned max_rec, unsigned speed)
 502 {
 503         max_rec = min(max_rec, speed + 8);
 504         max_rec = min(max_rec, 0xbU); /* <= 4096 */
 505         if (max_rec < 8) {
 506                 fw_notify("max_rec %x out of range\n", max_rec);
 507                 max_rec = 8;
 508         }
 509
 510         return (1 << (max_rec + 1)) - RFC2374_FRAG_HDR_SIZE;
 511 }
 512
 513
 514 static int fwnet_finish_incoming_packet(struct net_device *net,
 515                                         struct sk_buff *skb, u16 source_node_id,
 516                                         bool is_broadcast, u16 ether_type)
 517 {
 518         struct fwnet_device *dev;
 519         static const __be64 broadcast_hw = cpu_to_be64(~0ULL);
 520         int status;
 521         __be64 guid;
 522
 523         dev = netdev_priv(net);
 524         /* Write metadata, and then pass to the receive level */
 525         skb->dev = net;
 526         skb->ip_summed = CHECKSUM_UNNECESSARY;  /* don't check it */
 527
 528         /*
 529          * Parse the encapsulation header. This actually does the job of
 530          * converting to an ethernet frame header, as well as arp
 531          * conversion if needed. ARP conversion is easier in this
 532          * direction, since we are using ethernet as our backend.
 533          */
 534         /*
 535          * If this is an ARP packet, convert it. First, we want to make
 536          * use of some of the fields, since they tell us a little bit
 537          * about the sending machine.
 538          */
 539         if (ether_type == ETH_P_ARP) {
 540                 struct rfc2734_arp *arp1394;
 541                 struct arphdr *arp;
 542                 unsigned char *arp_ptr;
 543                 u64 fifo_addr;
 544                 u64 peer_guid;
 545                 unsigned sspd;
 546                 u16 max_payload;
 547                 struct fwnet_peer *peer;
 548                 unsigned long flags;
 549
 550                 arp1394   = (struct rfc2734_arp *)skb->data;
 551                 arp       = (struct arphdr *)skb->data;
 552                 arp_ptr   = (unsigned char *)(arp + 1);
 553                 peer_guid = get_unaligned_be64(&arp1394->s_uniq_id);
 554                 fifo_addr = (u64)get_unaligned_be16(&arp1394->fifo_hi) << 32
 555                                 | get_unaligned_be32(&arp1394->fifo_lo);
 556
 557                 sspd = arp1394->sspd;
 558                 /* Sanity check.  OS X 10.3 PPC reportedly sends 131. */
 559                 if (sspd > SCODE_3200) {
 560                         fw_notify("sspd %x out of range\n", sspd);
 561                         sspd = SCODE_3200;
 562                 }
 563                 max_payload = fwnet_max_payload(arp1394->max_rec, sspd);
 564
 565                 spin_lock_irqsave(&dev->lock, flags);
 566                 peer = fwnet_peer_find_by_guid(dev, peer_guid);
 567                 if (peer) {
 568                         peer->fifo = fifo_addr;
 569
 570                         if (peer->speed > sspd)
 571                                 peer->speed = sspd;
 572                         if (peer->max_payload > max_payload)
 573                                 peer->max_payload = max_payload;
 574
 575                         peer->ip = arp1394->sip;
 576                 }
 577                 spin_unlock_irqrestore(&dev->lock, flags);
 578
 579                 if (!peer) {
 580                         fw_notify("No peer for ARP packet from %016llx\n",
 581                                   (unsigned long long)peer_guid);
 582                         goto no_peer;
 583                 }
 584
 585                 /*
 586                  * Now that we're done with the 1394 specific stuff, we'll
 587                  * need to alter some of the data.  Believe it or not, all
 588                  * that needs to be done is sender_IP_address needs to be
 589                  * moved, the destination hardware address get stuffed
 590                  * in and the hardware address length set to 8.
 591                  *
 592                  * IMPORTANT: The code below overwrites 1394 specific data
 593                  * needed above so keep the munging of the data for the
 594                  * higher level IP stack last.
 595                  */
 596
 597                 arp->ar_hln = 8;
 598                 /* skip over sender unique id */
 599                 arp_ptr += arp->ar_hln;
 600                 /* move sender IP addr */
 601                 put_unaligned(arp1394->sip, (u32 *)arp_ptr);
 602                 /* skip over sender IP addr */
 603                 arp_ptr += arp->ar_pln;
 604
 605                 if (arp->ar_op == htons(ARPOP_REQUEST))
 606                         memset(arp_ptr, 0, sizeof(u64));
 607                 else
 608                         memcpy(arp_ptr, net->dev_addr, sizeof(u64));
 609         }
 610
 611         /* Now add the ethernet header. */
 612         guid = cpu_to_be64(dev->card->guid);
 613         if (dev_hard_header(skb, net, ether_type,
 614                            is_broadcast ? &broadcast_hw : &guid,
 615                            NULL, skb->len) >= 0) {
 616                 struct fwnet_header *eth;
 617                 u16 *rawp;
 618                 __be16 protocol;
 619
 620                 skb_reset_mac_header(skb);
 621                 skb_pull(skb, sizeof(*eth));
 622                 eth = (struct fwnet_header *)skb_mac_header(skb);
 623                 if (*eth->h_dest & 1) {
 624                         if (memcmp(eth->h_dest, net->broadcast,
 625                                    net->addr_len) == 0)
 626                                 skb->pkt_type = PACKET_BROADCAST;
 627 #if 0
 628                         else
 629                                 skb->pkt_type = PACKET_MULTICAST;
 630 #endif
 631                 } else {
 632                         if (memcmp(eth->h_dest, net->dev_addr, net->addr_len))
 633                                 skb->pkt_type = PACKET_OTHERHOST;
 634                 }
 635                 if (ntohs(eth->h_proto) >= 1536) {
 636                         protocol = eth->h_proto;
 637                 } else {
 638                         rawp = (u16 *)skb->data;
 639                         if (*rawp == 0xffff)
 640                                 protocol = htons(ETH_P_802_3);
 641                         else
 642                                 protocol = htons(ETH_P_802_2);
 643                 }
 644                 skb->protocol = protocol;
 645         }
 646         status = netif_rx(skb);
 647         if (status == NET_RX_DROP) {
 648                 net->stats.rx_errors++;
 649                 net->stats.rx_dropped++;
 650         } else {
 651                 net->stats.rx_packets++;
 652                 net->stats.rx_bytes += skb->len;
 653         }
 654
 655         return 0;
 656
 657  no_peer:
 658         net->stats.rx_errors++;
 659         net->stats.rx_dropped++;
 660
 661         dev_kfree_skb_any(skb);
 662
 663         return -ENOENT;
 664 }
 665
 666 static int fwnet_incoming_packet(struct fwnet_device *dev, __be32 *buf, int len,
 667                                  int source_node_id, int generation,
 668                                  bool is_broadcast)
 669 {
 670         struct sk_buff *skb;
 671         struct net_device *net = dev->netdev;
 672         struct rfc2734_header hdr;
 673         unsigned lf;
 674         unsigned long flags;
 675         struct fwnet_peer *peer;
 676         struct fwnet_partial_datagram *pd;
 677         int fg_off;
 678         int dg_size;
 679         u16 datagram_label;
 680         int retval;
 681         u16 ether_type;
 682
 683         hdr.w0 = be32_to_cpu(buf[0]);
 684         lf = fwnet_get_hdr_lf(&hdr);
 685         if (lf == RFC2374_HDR_UNFRAG) {
 686                 /*
 687                  * An unfragmented datagram has been received by the ieee1394
 688                  * bus. Build an skbuff around it so we can pass it to the
 689                  * high level network layer.
 690                  */
 691                 ether_type = fwnet_get_hdr_ether_type(&hdr);
 692                 buf++;
 693                 len -= RFC2374_UNFRAG_HDR_SIZE;
 694
 695                 skb = dev_alloc_skb(len + net->hard_header_len + 15);
 696                 if (unlikely(!skb)) {
 697                         fw_error("out of memory\n");
 698                         net->stats.rx_dropped++;
 699
 700                         return -ENOMEM;
 701                 }
 702                 skb_reserve(skb, (net->hard_header_len + 15) & ~15);
 703                 memcpy(skb_put(skb, len), buf, len);
 704
 705                 return fwnet_finish_incoming_packet(net, skb, source_node_id,
 706                                                     is_broadcast, ether_type);
 707         }
 708         /* A datagram fragment has been received, now the fun begins. */
 709         hdr.w1 = ntohl(buf[1]);
 710         buf += 2;
 711         len -= RFC2374_FRAG_HDR_SIZE;
 712         if (lf == RFC2374_HDR_FIRSTFRAG) {
 713                 ether_type = fwnet_get_hdr_ether_type(&hdr);
 714                 fg_off = 0;
 715         } else {
 716                 ether_type = 0;
 717                 fg_off = fwnet_get_hdr_fg_off(&hdr);
 718         }
 719         datagram_label = fwnet_get_hdr_dgl(&hdr);
 720         dg_size = fwnet_get_hdr_dg_size(&hdr); /* ??? + 1 */
 721
 722         spin_lock_irqsave(&dev->lock, flags);
 723
 724         peer = fwnet_peer_find_by_node_id(dev, source_node_id, generation);
 725         if (!peer) {
 726                 retval = -ENOENT;
 727                 goto fail;
 728         }
 729
 730         pd = fwnet_pd_find(peer, datagram_label);
 731         if (pd == NULL) {
 732                 while (peer->pdg_size >= FWNET_MAX_FRAGMENTS) {
 733                         /* remove the oldest */
 734                         fwnet_pd_delete(list_first_entry(&peer->pd_list,
 735                                 struct fwnet_partial_datagram, pd_link));
 736                         peer->pdg_size--;
 737                 }
 738                 pd = fwnet_pd_new(net, peer, datagram_label,
 739                                   dg_size, buf, fg_off, len);
 740                 if (pd == NULL) {
 741                         retval = -ENOMEM;
 742                         goto fail;
 743                 }
 744                 peer->pdg_size++;
 745         } else {
 746                 if (fwnet_frag_overlap(pd, fg_off, len) ||
 747                     pd->datagram_size != dg_size) {
 748                         /*
 749                          * Differing datagram sizes or overlapping fragments,
 750                          * discard old datagram and start a new one.
 751                          */
 752                         fwnet_pd_delete(pd);
 753                         pd = fwnet_pd_new(net, peer, datagram_label,
 754                                           dg_size, buf, fg_off, len);
 755                         if (pd == NULL) {
 756                                 peer->pdg_size--;
 757                                 retval = -ENOMEM;
 758                                 goto fail;
 759                         }
 760                 } else {
 761                         if (!fwnet_pd_update(peer, pd, buf, fg_off, len)) {
 762                                 /*
 763                                  * Couldn't save off fragment anyway
 764                                  * so might as well obliterate the
 765                                  * datagram now.
 766                                  */
 767                                 fwnet_pd_delete(pd);
 768                                 peer->pdg_size--;
 769                                 retval = -ENOMEM;
 770                                 goto fail;
 771                         }
 772                 }
 773         } /* new datagram or add to existing one */
 774
 775         if (lf == RFC2374_HDR_FIRSTFRAG)
 776                 pd->ether_type = ether_type;
 777
 778         if (fwnet_pd_is_complete(pd)) {
 779                 ether_type = pd->ether_type;
 780                 peer->pdg_size--;
 781                 skb = skb_get(pd->skb);
 782                 fwnet_pd_delete(pd);
 783
 784                 spin_unlock_irqrestore(&dev->lock, flags);
 785
 786                 return fwnet_finish_incoming_packet(net, skb, source_node_id,
 787                                                     false, ether_type);
 788         }
 789         /*
 790          * Datagram is not complete, we're done for the
 791          * moment.
 792          */
 793         retval = 0;
 794  fail:
 795         spin_unlock_irqrestore(&dev->lock, flags);
 796
 797         return retval;
 798 }
 799
 800 static void fwnet_receive_packet(struct fw_card *card, struct fw_request *r,
 801                 int tcode, int destination, int source, int generation,
 802                 unsigned long long offset, void *payload, size_t length,
 803                 void *callback_data)
 804 {
 805         struct fwnet_device *dev = callback_data;
 806         int rcode;
 807
 808         if (destination == IEEE1394_ALL_NODES) {
 809                 kfree(r);
 810
 811                 return;
 812         }
 813
 814         if (offset != dev->handler.offset)
 815                 rcode = RCODE_ADDRESS_ERROR;
 816         else if (tcode != TCODE_WRITE_BLOCK_REQUEST)
 817                 rcode = RCODE_TYPE_ERROR;
 818         else if (fwnet_incoming_packet(dev, payload, length,
 819                                        source, generation, false) != 0) {
 820                 fw_error("Incoming packet failure\n");
 821                 rcode = RCODE_CONFLICT_ERROR;
 822         } else
 823                 rcode = RCODE_COMPLETE;
 824
 825         fw_send_response(card, r, rcode);
 826 }
 827
 828 static void fwnet_receive_broadcast(struct fw_iso_context *context,
 829                 u32 cycle, size_t header_length, void *header, void *data)
 830 {
 831         struct fwnet_device *dev;
 832         struct fw_iso_packet packet;
 833         struct fw_card *card;
 834         __be16 *hdr_ptr;
 835         __be32 *buf_ptr;
 836         int retval;
 837         u32 length;
 838         u16 source_node_id;
 839         u32 specifier_id;
 840         u32 ver;
 841         unsigned long offset;
 842         unsigned long flags;
 843
 844         dev = data;
 845         card = dev->card;
 846         hdr_ptr = header;
 847         length = be16_to_cpup(hdr_ptr);
 848
 849         spin_lock_irqsave(&dev->lock, flags);
 850
 851         offset = dev->rcv_buffer_size * dev->broadcast_rcv_next_ptr;
 852         buf_ptr = dev->broadcast_rcv_buffer_ptrs[dev->broadcast_rcv_next_ptr++];
 853         if (dev->broadcast_rcv_next_ptr == dev->num_broadcast_rcv_ptrs)
 854                 dev->broadcast_rcv_next_ptr = 0;
 855
 856         spin_unlock_irqrestore(&dev->lock, flags);
 857
 858         specifier_id =    (be32_to_cpu(buf_ptr[0]) & 0xffff) << 8
 859                         | (be32_to_cpu(buf_ptr[1]) & 0xff000000) >> 24;
 860         ver = be32_to_cpu(buf_ptr[1]) & 0xffffff;
 861         source_node_id = be32_to_cpu(buf_ptr[0]) >> 16;
 862
 863         if (specifier_id == IANA_SPECIFIER_ID && ver == RFC2734_SW_VERSION) {
 864                 buf_ptr += 2;
 865                 length -= IEEE1394_GASP_HDR_SIZE;
 866                 fwnet_incoming_packet(dev, buf_ptr, length,
 867                                       source_node_id, -1, true);
 868         }
 869
 870         packet.payload_length = dev->rcv_buffer_size;
 871         packet.interrupt = 1;
 872         packet.skip = 0;
 873         packet.tag = 3;
 874         packet.sy = 0;
 875         packet.header_length = IEEE1394_GASP_HDR_SIZE;
 876
 877         spin_lock_irqsave(&dev->lock, flags);
 878
 879         retval = fw_iso_context_queue(dev->broadcast_rcv_context, &packet,
 880                                       &dev->broadcast_rcv_buffer, offset);
 881
 882         spin_unlock_irqrestore(&dev->lock, flags);
 883
 884         if (retval < 0)
 885                 fw_error("requeue failed\n");
 886 }
 887
 888 static struct kmem_cache *fwnet_packet_task_cache;
 889
 890 static void fwnet_free_ptask(struct fwnet_packet_task *ptask)
 891 {
 892         dev_kfree_skb_any(ptask->skb);
 893         kmem_cache_free(fwnet_packet_task_cache, ptask);
 894 }
 895
 896 /* Caller must hold dev->lock. */
 897 static void dec_queued_datagrams(struct fwnet_device *dev)
 898 {
 899         if (--dev->queued_datagrams == FWNET_MIN_QUEUED_DATAGRAMS)
 900                 netif_wake_queue(dev->netdev);
 901 }
 902
 903 static int fwnet_send_packet(struct fwnet_packet_task *ptask);
 904
 905 static void fwnet_transmit_packet_done(struct fwnet_packet_task *ptask)
 906 {
 907         struct fwnet_device *dev = ptask->dev;
 908         struct sk_buff *skb = ptask->skb;
 909         unsigned long flags;
 910         bool free;
 911
 912         spin_lock_irqsave(&dev->lock, flags);
 913
 914         ptask->outstanding_pkts--;
 915
 916         /* Check whether we or the networking TX soft-IRQ is last user. */
 917         free = (ptask->outstanding_pkts == 0 && ptask->enqueued);
 918         if (free)
 919                 dec_queued_datagrams(dev);
 920
 921         if (ptask->outstanding_pkts == 0) {
 922                 dev->netdev->stats.tx_packets++;
 923                 dev->netdev->stats.tx_bytes += skb->len;
 924         }
 925
 926         spin_unlock_irqrestore(&dev->lock, flags);
 927
 928         if (ptask->outstanding_pkts > 0) {
 929                 u16 dg_size;
 930                 u16 fg_off;
 931                 u16 datagram_label;
 932                 u16 lf;
 933
 934                 /* Update the ptask to point to the next fragment and send it */
 935                 lf = fwnet_get_hdr_lf(&ptask->hdr);
 936                 switch (lf) {
 937                 case RFC2374_HDR_LASTFRAG:
 938                 case RFC2374_HDR_UNFRAG:
 939                 default:
 940                         fw_error("Outstanding packet %x lf %x, header %x,%x\n",
 941                                  ptask->outstanding_pkts, lf, ptask->hdr.w0,
 942                                  ptask->hdr.w1);
 943                         BUG();
 944
 945                 case RFC2374_HDR_FIRSTFRAG:
 946                         /* Set frag type here for future interior fragments */
 947                         dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
 948                         fg_off = ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
 949                         datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
 950                         break;
 951
 952                 case RFC2374_HDR_INTFRAG:
 953                         dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
 954                         fg_off = fwnet_get_hdr_fg_off(&ptask->hdr)
 955                                   + ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
 956                         datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
 957                         break;
 958                 }
 959
 960                 skb_pull(skb, ptask->max_payload);
 961                 if (ptask->outstanding_pkts > 1) {
 962                         fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_INTFRAG,
 963                                           dg_size, fg_off, datagram_label);
 964                 } else {
 965                         fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_LASTFRAG,
 966                                           dg_size, fg_off, datagram_label);
 967                         ptask->max_payload = skb->len + RFC2374_FRAG_HDR_SIZE;
 968                 }
 969                 fwnet_send_packet(ptask);
 970         }
 971
 972         if (free)
 973                 fwnet_free_ptask(ptask);
 974 }
 975
 976 static void fwnet_transmit_packet_failed(struct fwnet_packet_task *ptask)
 977 {
 978         struct fwnet_device *dev = ptask->dev;
 979         unsigned long flags;
 980         bool free;
 981
 982         spin_lock_irqsave(&dev->lock, flags);
 983
 984         /* One fragment failed; don't try to send remaining fragments. */
 985         ptask->outstanding_pkts = 0;
 986
 987         /* Check whether we or the networking TX soft-IRQ is last user. */
 988         free = ptask->enqueued;
 989         if (free)
 990                 dec_queued_datagrams(dev);
 991
 992         dev->netdev->stats.tx_dropped++;
 993         dev->netdev->stats.tx_errors++;
 994
 995         spin_unlock_irqrestore(&dev->lock, flags);
 996
 997         if (free)
 998                 fwnet_free_ptask(ptask);
 999 }
1000
1001 static void fwnet_write_complete(struct fw_card *card, int rcode,
1002                                  void *payload, size_t length, void *data)
1003 {
1004         struct fwnet_packet_task *ptask = data;
1005         static unsigned long j;
1006         static int last_rcode, errors_skipped;
1007
1008         if (rcode == RCODE_COMPLETE) {
1009                 fwnet_transmit_packet_done(ptask);
1010         } else {
1011                 fwnet_transmit_packet_failed(ptask);
1012
1013                 if (printk_timed_ratelimit(&j,  1000) || rcode != last_rcode) {
1014                         fw_error("fwnet_write_complete: "
1015                                 "failed: %x (skipped %d)\n", rcode, errors_skipped);
1016
1017                         errors_skipped = 0;
1018                         last_rcode = rcode;
1019                 } else
1020                         errors_skipped++;
1021         }
1022 }
1023
1024 static int fwnet_send_packet(struct fwnet_packet_task *ptask)
1025 {
1026         struct fwnet_device *dev;
1027         unsigned tx_len;
1028         struct rfc2734_header *bufhdr;
1029         unsigned long flags;
1030         bool free;
1031
1032         dev = ptask->dev;
1033         tx_len = ptask->max_payload;
1034         switch (fwnet_get_hdr_lf(&ptask->hdr)) {
1035         case RFC2374_HDR_UNFRAG:
1036                 bufhdr = (struct rfc2734_header *)
1037                                 skb_push(ptask->skb, RFC2374_UNFRAG_HDR_SIZE);
1038                 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
1039                 break;
1040
1041         case RFC2374_HDR_FIRSTFRAG:
1042         case RFC2374_HDR_INTFRAG:
1043         case RFC2374_HDR_LASTFRAG:
1044                 bufhdr = (struct rfc2734_header *)
1045                                 skb_push(ptask->skb, RFC2374_FRAG_HDR_SIZE);
1046                 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
1047                 put_unaligned_be32(ptask->hdr.w1, &bufhdr->w1);
1048                 break;
1049
1050         default:
1051                 BUG();
1052         }
1053         if (ptask->dest_node == IEEE1394_ALL_NODES) {
1054                 u8 *p;
1055                 int generation;
1056                 int node_id;
1057
1058                 /* ptask->generation may not have been set yet */
1059                 generation = dev->card->generation;
1060                 smp_rmb();
1061                 node_id = dev->card->node_id;
1062
1063                 p = skb_push(ptask->skb, 8);
1064                 put_unaligned_be32(node_id << 16 | IANA_SPECIFIER_ID >> 8, p);
1065                 put_unaligned_be32((IANA_SPECIFIER_ID & 0xff) << 24
1066                                                 | RFC2734_SW_VERSION, &p[4]);
1067
1068                 /* We should not transmit if broadcast_channel.valid == 0. */
1069                 fw_send_request(dev->card, &ptask->transaction,
1070                                 TCODE_STREAM_DATA,
1071                                 fw_stream_packet_destination_id(3,
1072                                                 IEEE1394_BROADCAST_CHANNEL, 0),
1073                                 generation, SCODE_100, 0ULL, ptask->skb->data,
1074                                 tx_len + 8, fwnet_write_complete, ptask);
1075
1076                 spin_lock_irqsave(&dev->lock, flags);
1077
1078                 /* If the AT tasklet already ran, we may be last user. */
1079                 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1080                 if (!free)
1081                         ptask->enqueued = true;
1082                 else
1083                         dec_queued_datagrams(dev);
1084
1085                 spin_unlock_irqrestore(&dev->lock, flags);
1086
1087                 goto out;
1088         }
1089
1090         fw_send_request(dev->card, &ptask->transaction,
1091                         TCODE_WRITE_BLOCK_REQUEST, ptask->dest_node,
1092                         ptask->generation, ptask->speed, ptask->fifo_addr,
1093                         ptask->skb->data, tx_len, 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         dev->netdev->trans_start = jiffies;
1107  out:
1108         if (free)
1109                 fwnet_free_ptask(ptask);
1110
1111         return 0;
1112 }
1113
1114 static int fwnet_broadcast_start(struct fwnet_device *dev)
1115 {
1116         struct fw_iso_context *context;
1117         int retval;
1118         unsigned num_packets;
1119         unsigned max_receive;
1120         struct fw_iso_packet packet;
1121         unsigned long offset;
1122         unsigned u;
1123
1124         if (dev->local_fifo == FWNET_NO_FIFO_ADDR) {
1125                 /* outside OHCI posted write area? */
1126                 static const struct fw_address_region region = {
1127                         .start = 0xffff00000000ULL,
1128                         .end   = CSR_REGISTER_BASE,
1129                 };
1130
1131                 dev->handler.length = 4096;
1132                 dev->handler.address_callback = fwnet_receive_packet;
1133                 dev->handler.callback_data = dev;
1134
1135                 retval = fw_core_add_address_handler(&dev->handler, &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                 fw_error("Cannot register the driver\n");
1550                 goto out;
1551         }
1552
1553         list_add_tail(&dev->dev_link, &fwnet_device_list);
1554         fw_notify("%s: IPv4 over FireWire on device %016llx\n",
1555                   net->name, (unsigned long long)card->guid);
1556  have_dev:
1557         ret = fwnet_add_peer(dev, unit, device);
1558         if (ret && allocated_netdev) {
1559                 unregister_netdev(net);
1560                 list_del(&dev->dev_link);
1561         }
1562  out:
1563         if (ret && allocated_netdev)
1564                 free_netdev(net);
1565
1566         mutex_unlock(&fwnet_device_mutex);
1567
1568         return ret;
1569 }
1570
1571 static void fwnet_remove_peer(struct fwnet_peer *peer, struct fwnet_device *dev)
1572 {
1573         struct fwnet_partial_datagram *pd, *pd_next;
1574
1575         spin_lock_irq(&dev->lock);
1576         list_del(&peer->peer_link);
1577         dev->peer_count--;
1578         set_carrier_state(dev);
1579         spin_unlock_irq(&dev->lock);
1580
1581         list_for_each_entry_safe(pd, pd_next, &peer->pd_list, pd_link)
1582                 fwnet_pd_delete(pd);
1583
1584         kfree(peer);
1585 }
1586
1587 static int fwnet_remove(struct device *_dev)
1588 {
1589         struct fwnet_peer *peer = dev_get_drvdata(_dev);
1590         struct fwnet_device *dev = peer->dev;
1591         struct net_device *net;
1592         int i;
1593
1594         mutex_lock(&fwnet_device_mutex);
1595
1596         net = dev->netdev;
1597         if (net && peer->ip)
1598                 arp_invalidate(net, peer->ip);
1599
1600         fwnet_remove_peer(peer, dev);
1601
1602         if (list_empty(&dev->peer_list)) {
1603                 unregister_netdev(net);
1604
1605                 if (dev->local_fifo != FWNET_NO_FIFO_ADDR)
1606                         fw_core_remove_address_handler(&dev->handler);
1607                 if (dev->broadcast_rcv_context) {
1608                         fw_iso_context_stop(dev->broadcast_rcv_context);
1609                         fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer,
1610                                               dev->card);
1611                         fw_iso_context_destroy(dev->broadcast_rcv_context);
1612                 }
1613                 for (i = 0; dev->queued_datagrams && i < 5; i++)
1614                         ssleep(1);
1615                 WARN_ON(dev->queued_datagrams);
1616                 list_del(&dev->dev_link);
1617
1618                 free_netdev(net);
1619         }
1620
1621         mutex_unlock(&fwnet_device_mutex);
1622
1623         return 0;
1624 }
1625
1626 /*
1627  * FIXME abort partially sent fragmented datagrams,
1628  * discard partially received fragmented datagrams
1629  */
1630 static void fwnet_update(struct fw_unit *unit)
1631 {
1632         struct fw_device *device = fw_parent_device(unit);
1633         struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1634         int generation;
1635
1636         generation = device->generation;
1637
1638         spin_lock_irq(&peer->dev->lock);
1639         peer->node_id    = device->node_id;
1640         peer->generation = generation;
1641         spin_unlock_irq(&peer->dev->lock);
1642 }
1643
1644 static const struct ieee1394_device_id fwnet_id_table[] = {
1645         {
1646                 .match_flags  = IEEE1394_MATCH_SPECIFIER_ID |
1647                                 IEEE1394_MATCH_VERSION,
1648                 .specifier_id = IANA_SPECIFIER_ID,
1649                 .version      = RFC2734_SW_VERSION,
1650         },
1651         { }
1652 };
1653
1654 static struct fw_driver fwnet_driver = {
1655         .driver = {
1656                 .owner  = THIS_MODULE,
1657                 .name   = "net",
1658                 .bus    = &fw_bus_type,
1659                 .probe  = fwnet_probe,
1660                 .remove = fwnet_remove,
1661         },
1662         .update   = fwnet_update,
1663         .id_table = fwnet_id_table,
1664 };
1665
1666 static const u32 rfc2374_unit_directory_data[] = {
1667         0x00040000,     /* directory_length             */
1668         0x1200005e,     /* unit_specifier_id: IANA      */
1669         0x81000003,     /* textual descriptor offset    */
1670         0x13000001,     /* unit_sw_version: RFC 2734    */
1671         0x81000005,     /* textual descriptor offset    */
1672         0x00030000,     /* descriptor_length            */
1673         0x00000000,     /* text                         */
1674         0x00000000,     /* minimal ASCII, en            */
1675         0x49414e41,     /* I A N A                      */
1676         0x00030000,     /* descriptor_length            */
1677         0x00000000,     /* text                         */
1678         0x00000000,     /* minimal ASCII, en            */
1679         0x49507634,     /* I P v 4                      */
1680 };
1681
1682 static struct fw_descriptor rfc2374_unit_directory = {
1683         .length = ARRAY_SIZE(rfc2374_unit_directory_data),
1684         .key    = (CSR_DIRECTORY | CSR_UNIT) << 24,
1685         .data   = rfc2374_unit_directory_data
1686 };
1687
1688 static int __init fwnet_init(void)
1689 {
1690         int err;
1691
1692         err = fw_core_add_descriptor(&rfc2374_unit_directory);
1693         if (err)
1694                 return err;
1695
1696         fwnet_packet_task_cache = kmem_cache_create("packet_task",
1697                         sizeof(struct fwnet_packet_task), 0, 0, NULL);
1698         if (!fwnet_packet_task_cache) {
1699                 err = -ENOMEM;
1700                 goto out;
1701         }
1702
1703         err = driver_register(&fwnet_driver.driver);
1704         if (!err)
1705                 return 0;
1706
1707         kmem_cache_destroy(fwnet_packet_task_cache);
1708 out:
1709         fw_core_remove_descriptor(&rfc2374_unit_directory);
1710
1711         return err;
1712 }
1713 module_init(fwnet_init);
1714
1715 static void __exit fwnet_cleanup(void)
1716 {
1717         driver_unregister(&fwnet_driver.driver);
1718         kmem_cache_destroy(fwnet_packet_task_cache);
1719         fw_core_remove_descriptor(&rfc2374_unit_directory);
1720 }
1721 module_exit(fwnet_cleanup);
1722
1723 MODULE_AUTHOR("Jay Fenlason <fenlason@redhat.com>");
1724 MODULE_DESCRIPTION("IPv4 over IEEE1394 as per RFC 2734");
1725 MODULE_LICENSE("GPL");
1726 MODULE_DEVICE_TABLE(ieee1394, fwnet_id_table);