drivers/firewire/net.c

   1 /*
   2  * IPv4 over IEEE 1394, per RFC 2734
   3  *
   4  * Copyright (C) 2009 Jay Fenlason <fenlason@redhat.com>
   5  *
   6  * based on eth1394 by Ben Collins et al
   7  */
   8
   9 #include <linux/bug.h>
  10 #include <linux/compiler.h>
  11 #include <linux/delay.h>
  12 #include <linux/device.h>
  13 #include <linux/ethtool.h>
  14 #include <linux/firewire.h>
  15 #include <linux/firewire-constants.h>
  16 #include <linux/highmem.h>
  17 #include <linux/in.h>
  18 #include <linux/ip.h>
  19 #include <linux/jiffies.h>
  20 #include <linux/mod_devicetable.h>
  21 #include <linux/module.h>
  22 #include <linux/moduleparam.h>
  23 #include <linux/mutex.h>
  24 #include <linux/netdevice.h>
  25 #include <linux/skbuff.h>
  26 #include <linux/slab.h>
  27 #include <linux/spinlock.h>
  28
  29 #include <asm/unaligned.h>
  30 #include <net/arp.h>
  31
  32 /* rx limits */
  33 #define FWNET_MAX_FRAGMENTS             30 /* arbitrary, > TX queue depth */
  34 #define FWNET_ISO_PAGE_COUNT            (PAGE_SIZE < 16*1024 ? 4 : 2)
  35
  36 /* tx limits */
  37 #define FWNET_MAX_QUEUED_DATAGRAMS      20 /* < 64 = number of tlabels */
  38 #define FWNET_MIN_QUEUED_DATAGRAMS      10 /* should keep AT DMA busy enough */
  39 #define FWNET_TX_QUEUE_LEN              FWNET_MAX_QUEUED_DATAGRAMS /* ? */
  40
  41 #define IEEE1394_BROADCAST_CHANNEL      31
  42 #define IEEE1394_ALL_NODES              (0xffc0 | 0x003f)
  43 #define IEEE1394_MAX_PAYLOAD_S100       512
  44 #define FWNET_NO_FIFO_ADDR              (~0ULL)
  45
  46 #define IANA_SPECIFIER_ID               0x00005eU
  47 #define RFC2734_SW_VERSION              0x000001U
  48
  49 #define IEEE1394_GASP_HDR_SIZE  8
  50
  51 #define RFC2374_UNFRAG_HDR_SIZE 4
  52 #define RFC2374_FRAG_HDR_SIZE   8
  53 #define RFC2374_FRAG_OVERHEAD   4
  54
  55 #define RFC2374_HDR_UNFRAG      0       /* unfragmented         */
  56 #define RFC2374_HDR_FIRSTFRAG   1       /* first fragment       */
  57 #define RFC2374_HDR_LASTFRAG    2       /* last fragment        */
  58 #define RFC2374_HDR_INTFRAG     3       /* interior fragment    */
  59
  60 #define RFC2734_HW_ADDR_LEN     16
  61
  62 struct rfc2734_arp {
  63         __be16 hw_type;         /* 0x0018       */
  64         __be16 proto_type;      /* 0x0806       */
  65         u8 hw_addr_len;         /* 16           */
  66         u8 ip_addr_len;         /* 4            */
  67         __be16 opcode;          /* ARP Opcode   */
  68         /* Above is exactly the same format as struct arphdr */
  69
  70         __be64 s_uniq_id;       /* Sender's 64bit EUI                   */
  71         u8 max_rec;             /* Sender's max packet size             */
  72         u8 sspd;                /* Sender's max speed                   */
  73         __be16 fifo_hi;         /* hi 16bits of sender's FIFO addr      */
  74         __be32 fifo_lo;         /* lo 32bits of sender's FIFO addr      */
  75         __be32 sip;             /* Sender's IP Address                  */
  76         __be32 tip;             /* IP Address of requested hw addr      */
  77 } __packed;
  78
  79 /* This header format is specific to this driver implementation. */
  80 #define FWNET_ALEN      8
  81 #define FWNET_HLEN      10
  82 struct fwnet_header {
  83         u8 h_dest[FWNET_ALEN];  /* destination address */
  84         __be16 h_proto;         /* packet type ID field */
  85 } __packed;
  86
  87 /* IPv4 and IPv6 encapsulation header */
  88 struct rfc2734_header {
  89         u32 w0;
  90         u32 w1;
  91 };
  92
  93 #define fwnet_get_hdr_lf(h)             (((h)->w0 & 0xc0000000) >> 30)
  94 #define fwnet_get_hdr_ether_type(h)     (((h)->w0 & 0x0000ffff))
  95 #define fwnet_get_hdr_dg_size(h)        (((h)->w0 & 0x0fff0000) >> 16)
  96 #define fwnet_get_hdr_fg_off(h)         (((h)->w0 & 0x00000fff))
  97 #define fwnet_get_hdr_dgl(h)            (((h)->w1 & 0xffff0000) >> 16)
  98
  99 #define fwnet_set_hdr_lf(lf)            ((lf)  << 30)
 100 #define fwnet_set_hdr_ether_type(et)    (et)
 101 #define fwnet_set_hdr_dg_size(dgs)      ((dgs) << 16)
 102 #define fwnet_set_hdr_fg_off(fgo)       (fgo)
 103
 104 #define fwnet_set_hdr_dgl(dgl)          ((dgl) << 16)
 105
 106 static inline void fwnet_make_uf_hdr(struct rfc2734_header *hdr,
 107                 unsigned ether_type)
 108 {
 109         hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_UNFRAG)
 110                   | fwnet_set_hdr_ether_type(ether_type);
 111 }
 112
 113 static inline void fwnet_make_ff_hdr(struct rfc2734_header *hdr,
 114                 unsigned ether_type, unsigned dg_size, unsigned dgl)
 115 {
 116         hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_FIRSTFRAG)
 117                   | fwnet_set_hdr_dg_size(dg_size)
 118                   | fwnet_set_hdr_ether_type(ether_type);
 119         hdr->w1 = fwnet_set_hdr_dgl(dgl);
 120 }
 121
 122 static inline void fwnet_make_sf_hdr(struct rfc2734_header *hdr,
 123                 unsigned lf, unsigned dg_size, unsigned fg_off, unsigned dgl)
 124 {
 125         hdr->w0 = fwnet_set_hdr_lf(lf)
 126                   | fwnet_set_hdr_dg_size(dg_size)
 127                   | fwnet_set_hdr_fg_off(fg_off);
 128         hdr->w1 = fwnet_set_hdr_dgl(dgl);
 129 }
 130
 131 /* This list keeps track of what parts of the datagram have been filled in */
 132 struct fwnet_fragment_info {
 133         struct list_head fi_link;
 134         u16 offset;
 135         u16 len;
 136 };
 137
 138 struct fwnet_partial_datagram {
 139         struct list_head pd_link;
 140         struct list_head fi_list;
 141         struct sk_buff *skb;
 142         /* FIXME Why not use skb->data? */
 143         char *pbuf;
 144         u16 datagram_label;
 145         u16 ether_type;
 146         u16 datagram_size;
 147 };
 148
 149 static DEFINE_MUTEX(fwnet_device_mutex);
 150 static LIST_HEAD(fwnet_device_list);
 151
 152 struct fwnet_device {
 153         struct list_head dev_link;
 154         spinlock_t lock;
 155         enum {
 156                 FWNET_BROADCAST_ERROR,
 157                 FWNET_BROADCAST_RUNNING,
 158                 FWNET_BROADCAST_STOPPED,
 159         } broadcast_state;
 160         struct fw_iso_context *broadcast_rcv_context;
 161         struct fw_iso_buffer broadcast_rcv_buffer;
 162         void **broadcast_rcv_buffer_ptrs;
 163         unsigned broadcast_rcv_next_ptr;
 164         unsigned num_broadcast_rcv_ptrs;
 165         unsigned rcv_buffer_size;
 166         /*
 167          * This value is the maximum unfragmented datagram size that can be
 168          * sent by the hardware.  It already has the GASP overhead and the
 169          * unfragmented datagram header overhead calculated into it.
 170          */
 171         unsigned broadcast_xmt_max_payload;
 172         u16 broadcast_xmt_datagramlabel;
 173
 174         /*
 175          * The CSR address that remote nodes must send datagrams to for us to
 176          * receive them.
 177          */
 178         struct fw_address_handler handler;
 179         u64 local_fifo;
 180
 181         /* Number of tx datagrams that have been queued but not yet acked */
 182         int queued_datagrams;
 183
 184         int peer_count;
 185         struct list_head peer_list;
 186         struct fw_card *card;
 187         struct net_device *netdev;
 188 };
 189
 190 struct fwnet_peer {
 191         struct list_head peer_link;
 192         struct fwnet_device *dev;
 193         u64 guid;
 194         u64 fifo;
 195         __be32 ip;
 196
 197         /* guarded by dev->lock */
 198         struct list_head pd_list; /* received partial datagrams */
 199         unsigned pdg_size;        /* pd_list size */
 200
 201         u16 datagram_label;       /* outgoing datagram label */
 202         u16 max_payload;          /* includes RFC2374_FRAG_HDR_SIZE overhead */
 203         int node_id;
 204         int generation;
 205         unsigned speed;
 206 };
 207
 208 /* This is our task struct. It's used for the packet complete callback.  */
 209 struct fwnet_packet_task {
 210         struct fw_transaction transaction;
 211         struct rfc2734_header hdr;
 212         struct sk_buff *skb;
 213         struct fwnet_device *dev;
 214
 215         int outstanding_pkts;
 216         u64 fifo_addr;
 217         u16 dest_node;
 218         u16 max_payload;
 219         u8 generation;
 220         u8 speed;
 221         u8 enqueued;
 222 };
 223
 224 /*
 225  * saddr == NULL means use device source address.
 226  * daddr == NULL means leave destination address (eg unresolved arp).
 227  */
 228 static int fwnet_header_create(struct sk_buff *skb, struct net_device *net,
 229                         unsigned short type, const void *daddr,
 230                         const void *saddr, unsigned len)
 231 {
 232         struct fwnet_header *h;
 233
 234         h = (struct fwnet_header *)skb_push(skb, sizeof(*h));
 235         put_unaligned_be16(type, &h->h_proto);
 236
 237         if (net->flags & (IFF_LOOPBACK | IFF_NOARP)) {
 238                 memset(h->h_dest, 0, net->addr_len);
 239
 240                 return net->hard_header_len;
 241         }
 242
 243         if (daddr) {
 244                 memcpy(h->h_dest, daddr, net->addr_len);
 245
 246                 return net->hard_header_len;
 247         }
 248
 249         return -net->hard_header_len;
 250 }
 251
 252 static int fwnet_header_rebuild(struct sk_buff *skb)
 253 {
 254         struct fwnet_header *h = (struct fwnet_header *)skb->data;
 255
 256         if (get_unaligned_be16(&h->h_proto) == ETH_P_IP)
 257                 return arp_find((unsigned char *)&h->h_dest, skb);
 258
 259         fw_notify("%s: unable to resolve type %04x addresses\n",
 260                   skb->dev->name, be16_to_cpu(h->h_proto));
 261         return 0;
 262 }
 263
 264 static int fwnet_header_cache(const struct neighbour *neigh,
 265                               struct hh_cache *hh, __be16 type)
 266 {
 267         struct net_device *net;
 268         struct fwnet_header *h;
 269
 270         if (type == cpu_to_be16(ETH_P_802_3))
 271                 return -1;
 272         net = neigh->dev;
 273         h = (struct fwnet_header *)((u8 *)hh->hh_data + 16 - sizeof(*h));
 274         h->h_proto = type;
 275         memcpy(h->h_dest, neigh->ha, net->addr_len);
 276         hh->hh_len = FWNET_HLEN;
 277
 278         return 0;
 279 }
 280
 281 /* Called by Address Resolution module to notify changes in address. */
 282 static void fwnet_header_cache_update(struct hh_cache *hh,
 283                 const struct net_device *net, const unsigned char *haddr)
 284 {
 285         memcpy((u8 *)hh->hh_data + 16 - FWNET_HLEN, haddr, net->addr_len);
 286 }
 287
 288 static int fwnet_header_parse(const struct sk_buff *skb, unsigned char *haddr)
 289 {
 290         memcpy(haddr, skb->dev->dev_addr, FWNET_ALEN);
 291
 292         return FWNET_ALEN;
 293 }
 294
 295 static const struct header_ops fwnet_header_ops = {
 296         .create         = fwnet_header_create,
 297         .rebuild        = fwnet_header_rebuild,
 298         .cache          = fwnet_header_cache,
 299         .cache_update   = fwnet_header_cache_update,
 300         .parse          = fwnet_header_parse,
 301 };
 302
 303 /* FIXME: is this correct for all cases? */
 304 static bool fwnet_frag_overlap(struct fwnet_partial_datagram *pd,
 305                                unsigned offset, unsigned len)
 306 {
 307         struct fwnet_fragment_info *fi;
 308         unsigned end = offset + len;
 309
 310         list_for_each_entry(fi, &pd->fi_list, fi_link)
 311                 if (offset < fi->offset + fi->len && end > fi->offset)
 312                         return true;
 313
 314         return false;
 315 }
 316
 317 /* Assumes that new fragment does not overlap any existing fragments */
 318 static struct fwnet_fragment_info *fwnet_frag_new(
 319         struct fwnet_partial_datagram *pd, unsigned offset, unsigned len)
 320 {
 321         struct fwnet_fragment_info *fi, *fi2, *new;
 322         struct list_head *list;
 323
 324         list = &pd->fi_list;
 325         list_for_each_entry(fi, &pd->fi_list, fi_link) {
 326                 if (fi->offset + fi->len == offset) {
 327                         /* The new fragment can be tacked on to the end */
 328                         /* Did the new fragment plug a hole? */
 329                         fi2 = list_entry(fi->fi_link.next,
 330                                          struct fwnet_fragment_info, fi_link);
 331                         if (fi->offset + fi->len == fi2->offset) {
 332                                 /* glue fragments together */
 333                                 fi->len += len + fi2->len;
 334                                 list_del(&fi2->fi_link);
 335                                 kfree(fi2);
 336                         } else {
 337                                 fi->len += len;
 338                         }
 339
 340                         return fi;
 341                 }
 342                 if (offset + len == fi->offset) {
 343                         /* The new fragment can be tacked on to the beginning */
 344                         /* Did the new fragment plug a hole? */
 345                         fi2 = list_entry(fi->fi_link.prev,
 346                                          struct fwnet_fragment_info, fi_link);
 347                         if (fi2->offset + fi2->len == fi->offset) {
 348                                 /* glue fragments together */
 349                                 fi2->len += fi->len + len;
 350                                 list_del(&fi->fi_link);
 351                                 kfree(fi);
 352
 353                                 return fi2;
 354                         }
 355                         fi->offset = offset;
 356                         fi->len += len;
 357
 358                         return fi;
 359                 }
 360                 if (offset > fi->offset + fi->len) {
 361                         list = &fi->fi_link;
 362                         break;
 363                 }
 364                 if (offset + len < fi->offset) {
 365                         list = fi->fi_link.prev;
 366                         break;
 367                 }
 368         }
 369
 370         new = kmalloc(sizeof(*new), GFP_ATOMIC);
 371         if (!new) {
 372                 fw_error("out of memory\n");
 373                 return NULL;
 374         }
 375
 376         new->offset = offset;
 377         new->len = len;
 378         list_add(&new->fi_link, list);
 379
 380         return new;
 381 }
 382
 383 static struct fwnet_partial_datagram *fwnet_pd_new(struct net_device *net,
 384                 struct fwnet_peer *peer, u16 datagram_label, unsigned dg_size,
 385                 void *frag_buf, unsigned frag_off, unsigned frag_len)
 386 {
 387         struct fwnet_partial_datagram *new;
 388         struct fwnet_fragment_info *fi;
 389
 390         new = kmalloc(sizeof(*new), GFP_ATOMIC);
 391         if (!new)
 392                 goto fail;
 393
 394         INIT_LIST_HEAD(&new->fi_list);
 395         fi = fwnet_frag_new(new, frag_off, frag_len);
 396         if (fi == NULL)
 397                 goto fail_w_new;
 398
 399         new->datagram_label = datagram_label;
 400         new->datagram_size = dg_size;
 401         new->skb = dev_alloc_skb(dg_size + net->hard_header_len + 15);
 402         if (new->skb == NULL)
 403                 goto fail_w_fi;
 404
 405         skb_reserve(new->skb, (net->hard_header_len + 15) & ~15);
 406         new->pbuf = skb_put(new->skb, dg_size);
 407         memcpy(new->pbuf + frag_off, frag_buf, frag_len);
 408         list_add_tail(&new->pd_link, &peer->pd_list);
 409
 410         return new;
 411
 412 fail_w_fi:
 413         kfree(fi);
 414 fail_w_new:
 415         kfree(new);
 416 fail:
 417         fw_error("out of memory\n");
 418
 419         return NULL;
 420 }
 421
 422 static struct fwnet_partial_datagram *fwnet_pd_find(struct fwnet_peer *peer,
 423                                                     u16 datagram_label)
 424 {
 425         struct fwnet_partial_datagram *pd;
 426
 427         list_for_each_entry(pd, &peer->pd_list, pd_link)
 428                 if (pd->datagram_label == datagram_label)
 429                         return pd;
 430
 431         return NULL;
 432 }
 433
 434
 435 static void fwnet_pd_delete(struct fwnet_partial_datagram *old)
 436 {
 437         struct fwnet_fragment_info *fi, *n;
 438
 439         list_for_each_entry_safe(fi, n, &old->fi_list, fi_link)
 440                 kfree(fi);
 441
 442         list_del(&old->pd_link);
 443         dev_kfree_skb_any(old->skb);
 444         kfree(old);
 445 }
 446
 447 static bool fwnet_pd_update(struct fwnet_peer *peer,
 448                 struct fwnet_partial_datagram *pd, void *frag_buf,
 449                 unsigned frag_off, unsigned frag_len)
 450 {
 451         if (fwnet_frag_new(pd, frag_off, frag_len) == NULL)
 452                 return false;
 453
 454         memcpy(pd->pbuf + frag_off, frag_buf, frag_len);
 455
 456         /*
 457          * Move list entry to beginning of list so that oldest partial
 458          * datagrams percolate to the end of the list
 459          */
 460         list_move_tail(&pd->pd_link, &peer->pd_list);
 461
 462         return true;
 463 }
 464
 465 static bool fwnet_pd_is_complete(struct fwnet_partial_datagram *pd)
 466 {
 467         struct fwnet_fragment_info *fi;
 468
 469         fi = list_entry(pd->fi_list.next, struct fwnet_fragment_info, fi_link);
 470
 471         return fi->len == pd->datagram_size;
 472 }
 473
 474 /* caller must hold dev->lock */
 475 static struct fwnet_peer *fwnet_peer_find_by_guid(struct fwnet_device *dev,
 476                                                   u64 guid)
 477 {
 478         struct fwnet_peer *peer;
 479
 480         list_for_each_entry(peer, &dev->peer_list, peer_link)
 481                 if (peer->guid == guid)
 482                         return peer;
 483
 484         return NULL;
 485 }
 486
 487 /* caller must hold dev->lock */
 488 static struct fwnet_peer *fwnet_peer_find_by_node_id(struct fwnet_device *dev,
 489                                                 int node_id, int generation)
 490 {
 491         struct fwnet_peer *peer;
 492
 493         list_for_each_entry(peer, &dev->peer_list, peer_link)
 494                 if (peer->node_id    == node_id &&
 495                     peer->generation == generation)
 496                         return peer;
 497
 498         return NULL;
 499 }
 500
 501 /* See IEEE 1394-2008 table 6-4, table 8-8, table 16-18. */
 502 static unsigned fwnet_max_payload(unsigned max_rec, unsigned speed)
 503 {
 504         max_rec = min(max_rec, speed + 8);
 505         max_rec = clamp(max_rec, 8U, 11U); /* 512...4096 */
 506
 507         return (1 << (max_rec + 1)) - RFC2374_FRAG_HDR_SIZE;
 508 }
 509
 510
 511 static int fwnet_finish_incoming_packet(struct net_device *net,
 512                                         struct sk_buff *skb, u16 source_node_id,
 513                                         bool is_broadcast, u16 ether_type)
 514 {
 515         struct fwnet_device *dev;
 516         static const __be64 broadcast_hw = cpu_to_be64(~0ULL);
 517         int status;
 518         __be64 guid;
 519
 520         dev = netdev_priv(net);
 521         /* Write metadata, and then pass to the receive level */
 522         skb->dev = net;
 523         skb->ip_summed = CHECKSUM_UNNECESSARY;  /* don't check it */
 524
 525         /*
 526          * Parse the encapsulation header. This actually does the job of
 527          * converting to an ethernet frame header, as well as arp
 528          * conversion if needed. ARP conversion is easier in this
 529          * direction, since we are using ethernet as our backend.
 530          */
 531         /*
 532          * If this is an ARP packet, convert it. First, we want to make
 533          * use of some of the fields, since they tell us a little bit
 534          * about the sending machine.
 535          */
 536         if (ether_type == ETH_P_ARP) {
 537                 struct rfc2734_arp *arp1394;
 538                 struct arphdr *arp;
 539                 unsigned char *arp_ptr;
 540                 u64 fifo_addr;
 541                 u64 peer_guid;
 542                 unsigned sspd;
 543                 u16 max_payload;
 544                 struct fwnet_peer *peer;
 545                 unsigned long flags;
 546
 547                 arp1394   = (struct rfc2734_arp *)skb->data;
 548                 arp       = (struct arphdr *)skb->data;
 549                 arp_ptr   = (unsigned char *)(arp + 1);
 550                 peer_guid = get_unaligned_be64(&arp1394->s_uniq_id);
 551                 fifo_addr = (u64)get_unaligned_be16(&arp1394->fifo_hi) << 32
 552                                 | get_unaligned_be32(&arp1394->fifo_lo);
 553
 554                 sspd = arp1394->sspd;
 555                 /* Sanity check.  OS X 10.3 PPC reportedly sends 131. */
 556                 if (sspd > SCODE_3200) {
 557                         fw_notify("sspd %x out of range\n", sspd);
 558                         sspd = SCODE_3200;
 559                 }
 560                 max_payload = fwnet_max_payload(arp1394->max_rec, sspd);
 561
 562                 spin_lock_irqsave(&dev->lock, flags);
 563                 peer = fwnet_peer_find_by_guid(dev, peer_guid);
 564                 if (peer) {
 565                         peer->fifo = fifo_addr;
 566
 567                         if (peer->speed > sspd)
 568                                 peer->speed = sspd;
 569                         if (peer->max_payload > max_payload)
 570                                 peer->max_payload = max_payload;
 571
 572                         peer->ip = arp1394->sip;
 573                 }
 574                 spin_unlock_irqrestore(&dev->lock, flags);
 575
 576                 if (!peer) {
 577                         fw_notify("No peer for ARP packet from %016llx\n",
 578                                   (unsigned long long)peer_guid);
 579                         goto no_peer;
 580                 }
 581
 582                 /*
 583                  * Now that we're done with the 1394 specific stuff, we'll
 584                  * need to alter some of the data.  Believe it or not, all
 585                  * that needs to be done is sender_IP_address needs to be
 586                  * moved, the destination hardware address get stuffed
 587                  * in and the hardware address length set to 8.
 588                  *
 589                  * IMPORTANT: The code below overwrites 1394 specific data
 590                  * needed above so keep the munging of the data for the
 591                  * higher level IP stack last.
 592                  */
 593
 594                 arp->ar_hln = 8;
 595                 /* skip over sender unique id */
 596                 arp_ptr += arp->ar_hln;
 597                 /* move sender IP addr */
 598                 put_unaligned(arp1394->sip, (u32 *)arp_ptr);
 599                 /* skip over sender IP addr */
 600                 arp_ptr += arp->ar_pln;
 601
 602                 if (arp->ar_op == htons(ARPOP_REQUEST))
 603                         memset(arp_ptr, 0, sizeof(u64));
 604                 else
 605                         memcpy(arp_ptr, net->dev_addr, sizeof(u64));
 606         }
 607
 608         /* Now add the ethernet header. */
 609         guid = cpu_to_be64(dev->card->guid);
 610         if (dev_hard_header(skb, net, ether_type,
 611                            is_broadcast ? &broadcast_hw : &guid,
 612                            NULL, skb->len) >= 0) {
 613                 struct fwnet_header *eth;
 614                 u16 *rawp;
 615                 __be16 protocol;
 616
 617                 skb_reset_mac_header(skb);
 618                 skb_pull(skb, sizeof(*eth));
 619                 eth = (struct fwnet_header *)skb_mac_header(skb);
 620                 if (*eth->h_dest & 1) {
 621                         if (memcmp(eth->h_dest, net->broadcast,
 622                                    net->addr_len) == 0)
 623                                 skb->pkt_type = PACKET_BROADCAST;
 624 #if 0
 625                         else
 626                                 skb->pkt_type = PACKET_MULTICAST;
 627 #endif
 628                 } else {
 629                         if (memcmp(eth->h_dest, net->dev_addr, net->addr_len))
 630                                 skb->pkt_type = PACKET_OTHERHOST;
 631                 }
 632                 if (ntohs(eth->h_proto) >= 1536) {
 633                         protocol = eth->h_proto;
 634                 } else {
 635                         rawp = (u16 *)skb->data;
 636                         if (*rawp == 0xffff)
 637                                 protocol = htons(ETH_P_802_3);
 638                         else
 639                                 protocol = htons(ETH_P_802_2);
 640                 }
 641                 skb->protocol = protocol;
 642         }
 643         status = netif_rx(skb);
 644         if (status == NET_RX_DROP) {
 645                 net->stats.rx_errors++;
 646                 net->stats.rx_dropped++;
 647         } else {
 648                 net->stats.rx_packets++;
 649                 net->stats.rx_bytes += skb->len;
 650         }
 651
 652         return 0;
 653
 654  no_peer:
 655         net->stats.rx_errors++;
 656         net->stats.rx_dropped++;
 657
 658         dev_kfree_skb_any(skb);
 659
 660         return -ENOENT;
 661 }
 662
 663 static int fwnet_incoming_packet(struct fwnet_device *dev, __be32 *buf, int len,
 664                                  int source_node_id, int generation,
 665                                  bool is_broadcast)
 666 {
 667         struct sk_buff *skb;
 668         struct net_device *net = dev->netdev;
 669         struct rfc2734_header hdr;
 670         unsigned lf;
 671         unsigned long flags;
 672         struct fwnet_peer *peer;
 673         struct fwnet_partial_datagram *pd;
 674         int fg_off;
 675         int dg_size;
 676         u16 datagram_label;
 677         int retval;
 678         u16 ether_type;
 679
 680         if (len <= RFC2374_UNFRAG_HDR_SIZE)
 681                 return 0;
 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
 709         /* A datagram fragment has been received, now the fun begins. */
 710
 711         if (len <= RFC2374_FRAG_HDR_SIZE)
 712                 return 0;
 713
 714         hdr.w1 = ntohl(buf[1]);
 715         buf += 2;
 716         len -= RFC2374_FRAG_HDR_SIZE;
 717         if (lf == RFC2374_HDR_FIRSTFRAG) {
 718                 ether_type = fwnet_get_hdr_ether_type(&hdr);
 719                 fg_off = 0;
 720         } else {
 721                 ether_type = 0;
 722                 fg_off = fwnet_get_hdr_fg_off(&hdr);
 723         }
 724         datagram_label = fwnet_get_hdr_dgl(&hdr);
 725         dg_size = fwnet_get_hdr_dg_size(&hdr); /* ??? + 1 */
 726
 727         if (fg_off + len > dg_size)
 728                 return 0;
 729
 730         spin_lock_irqsave(&dev->lock, flags);
 731
 732         peer = fwnet_peer_find_by_node_id(dev, source_node_id, generation);
 733         if (!peer) {
 734                 retval = -ENOENT;
 735                 goto fail;
 736         }
 737
 738         pd = fwnet_pd_find(peer, datagram_label);
 739         if (pd == NULL) {
 740                 while (peer->pdg_size >= FWNET_MAX_FRAGMENTS) {
 741                         /* remove the oldest */
 742                         fwnet_pd_delete(list_first_entry(&peer->pd_list,
 743                                 struct fwnet_partial_datagram, pd_link));
 744                         peer->pdg_size--;
 745                 }
 746                 pd = fwnet_pd_new(net, peer, datagram_label,
 747                                   dg_size, buf, fg_off, len);
 748                 if (pd == NULL) {
 749                         retval = -ENOMEM;
 750                         goto fail;
 751                 }
 752                 peer->pdg_size++;
 753         } else {
 754                 if (fwnet_frag_overlap(pd, fg_off, len) ||
 755                     pd->datagram_size != dg_size) {
 756                         /*
 757                          * Differing datagram sizes or overlapping fragments,
 758                          * discard old datagram and start a new one.
 759                          */
 760                         fwnet_pd_delete(pd);
 761                         pd = fwnet_pd_new(net, peer, datagram_label,
 762                                           dg_size, buf, fg_off, len);
 763                         if (pd == NULL) {
 764                                 peer->pdg_size--;
 765                                 retval = -ENOMEM;
 766                                 goto fail;
 767                         }
 768                 } else {
 769                         if (!fwnet_pd_update(peer, pd, buf, fg_off, len)) {
 770                                 /*
 771                                  * Couldn't save off fragment anyway
 772                                  * so might as well obliterate the
 773                                  * datagram now.
 774                                  */
 775                                 fwnet_pd_delete(pd);
 776                                 peer->pdg_size--;
 777                                 retval = -ENOMEM;
 778                                 goto fail;
 779                         }
 780                 }
 781         } /* new datagram or add to existing one */
 782
 783         if (lf == RFC2374_HDR_FIRSTFRAG)
 784                 pd->ether_type = ether_type;
 785
 786         if (fwnet_pd_is_complete(pd)) {
 787                 ether_type = pd->ether_type;
 788                 peer->pdg_size--;
 789                 skb = skb_get(pd->skb);
 790                 fwnet_pd_delete(pd);
 791
 792                 spin_unlock_irqrestore(&dev->lock, flags);
 793
 794                 return fwnet_finish_incoming_packet(net, skb, source_node_id,
 795                                                     false, ether_type);
 796         }
 797         /*
 798          * Datagram is not complete, we're done for the
 799          * moment.
 800          */
 801         retval = 0;
 802  fail:
 803         spin_unlock_irqrestore(&dev->lock, flags);
 804
 805         return retval;
 806 }
 807
 808 static void fwnet_receive_packet(struct fw_card *card, struct fw_request *r,
 809                 int tcode, int destination, int source, int generation,
 810                 unsigned long long offset, void *payload, size_t length,
 811                 void *callback_data)
 812 {
 813         struct fwnet_device *dev = callback_data;
 814         int rcode;
 815
 816         if (destination == IEEE1394_ALL_NODES) {
 817                 kfree(r);
 818
 819                 return;
 820         }
 821
 822         if (offset != dev->handler.offset)
 823                 rcode = RCODE_ADDRESS_ERROR;
 824         else if (tcode != TCODE_WRITE_BLOCK_REQUEST)
 825                 rcode = RCODE_TYPE_ERROR;
 826         else if (fwnet_incoming_packet(dev, payload, length,
 827                                        source, generation, false) != 0) {
 828                 fw_error("Incoming packet failure\n");
 829                 rcode = RCODE_CONFLICT_ERROR;
 830         } else
 831                 rcode = RCODE_COMPLETE;
 832
 833         fw_send_response(card, r, rcode);
 834 }
 835
 836 static int gasp_source_id(__be32 *p)
 837 {
 838         return be32_to_cpu(p[0]) >> 16;
 839 }
 840
 841 static u32 gasp_specifier_id(__be32 *p)
 842 {
 843         return (be32_to_cpu(p[0]) & 0xffff) << 8 |
 844                (be32_to_cpu(p[1]) & 0xff000000) >> 24;
 845 }
 846
 847 static u32 gasp_version(__be32 *p)
 848 {
 849         return be32_to_cpu(p[1]) & 0xffffff;
 850 }
 851
 852 static void fwnet_receive_broadcast(struct fw_iso_context *context,
 853                 u32 cycle, size_t header_length, void *header, void *data)
 854 {
 855         struct fwnet_device *dev;
 856         struct fw_iso_packet packet;
 857         struct fw_card *card;
 858         __be16 *hdr_ptr;
 859         __be32 *buf_ptr;
 860         int retval;
 861         u32 length;
 862         unsigned long offset;
 863         unsigned long flags;
 864
 865         dev = data;
 866         card = dev->card;
 867         hdr_ptr = header;
 868         length = be16_to_cpup(hdr_ptr);
 869
 870         spin_lock_irqsave(&dev->lock, flags);
 871
 872         offset = dev->rcv_buffer_size * dev->broadcast_rcv_next_ptr;
 873         buf_ptr = dev->broadcast_rcv_buffer_ptrs[dev->broadcast_rcv_next_ptr++];
 874         if (dev->broadcast_rcv_next_ptr == dev->num_broadcast_rcv_ptrs)
 875                 dev->broadcast_rcv_next_ptr = 0;
 876
 877         spin_unlock_irqrestore(&dev->lock, flags);
 878
 879         if (length > IEEE1394_GASP_HDR_SIZE &&
 880             gasp_specifier_id(buf_ptr) == IANA_SPECIFIER_ID &&
 881             gasp_version(buf_ptr) == RFC2734_SW_VERSION)
 882                 fwnet_incoming_packet(dev, buf_ptr + 2,
 883                                       length - IEEE1394_GASP_HDR_SIZE,
 884                                       gasp_source_id(buf_ptr),
 885                                       context->card->generation, true);
 886
 887         packet.payload_length = dev->rcv_buffer_size;
 888         packet.interrupt = 1;
 889         packet.skip = 0;
 890         packet.tag = 3;
 891         packet.sy = 0;
 892         packet.header_length = IEEE1394_GASP_HDR_SIZE;
 893
 894         spin_lock_irqsave(&dev->lock, flags);
 895
 896         retval = fw_iso_context_queue(dev->broadcast_rcv_context, &packet,
 897                                       &dev->broadcast_rcv_buffer, offset);
 898
 899         spin_unlock_irqrestore(&dev->lock, flags);
 900
 901         if (retval >= 0)
 902                 fw_iso_context_queue_flush(dev->broadcast_rcv_context);
 903         else
 904                 fw_error("requeue failed\n");
 905 }
 906
 907 static struct kmem_cache *fwnet_packet_task_cache;
 908
 909 static void fwnet_free_ptask(struct fwnet_packet_task *ptask)
 910 {
 911         dev_kfree_skb_any(ptask->skb);
 912         kmem_cache_free(fwnet_packet_task_cache, ptask);
 913 }
 914
 915 /* Caller must hold dev->lock. */
 916 static void dec_queued_datagrams(struct fwnet_device *dev)
 917 {
 918         if (--dev->queued_datagrams == FWNET_MIN_QUEUED_DATAGRAMS)
 919                 netif_wake_queue(dev->netdev);
 920 }
 921
 922 static int fwnet_send_packet(struct fwnet_packet_task *ptask);
 923
 924 static void fwnet_transmit_packet_done(struct fwnet_packet_task *ptask)
 925 {
 926         struct fwnet_device *dev = ptask->dev;
 927         struct sk_buff *skb = ptask->skb;
 928         unsigned long flags;
 929         bool free;
 930
 931         spin_lock_irqsave(&dev->lock, flags);
 932
 933         ptask->outstanding_pkts--;
 934
 935         /* Check whether we or the networking TX soft-IRQ is last user. */
 936         free = (ptask->outstanding_pkts == 0 && ptask->enqueued);
 937         if (free)
 938                 dec_queued_datagrams(dev);
 939
 940         if (ptask->outstanding_pkts == 0) {
 941                 dev->netdev->stats.tx_packets++;
 942                 dev->netdev->stats.tx_bytes += skb->len;
 943         }
 944
 945         spin_unlock_irqrestore(&dev->lock, flags);
 946
 947         if (ptask->outstanding_pkts > 0) {
 948                 u16 dg_size;
 949                 u16 fg_off;
 950                 u16 datagram_label;
 951                 u16 lf;
 952
 953                 /* Update the ptask to point to the next fragment and send it */
 954                 lf = fwnet_get_hdr_lf(&ptask->hdr);
 955                 switch (lf) {
 956                 case RFC2374_HDR_LASTFRAG:
 957                 case RFC2374_HDR_UNFRAG:
 958                 default:
 959                         fw_error("Outstanding packet %x lf %x, header %x,%x\n",
 960                                  ptask->outstanding_pkts, lf, ptask->hdr.w0,
 961                                  ptask->hdr.w1);
 962                         BUG();
 963
 964                 case RFC2374_HDR_FIRSTFRAG:
 965                         /* Set frag type here for future interior fragments */
 966                         dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
 967                         fg_off = ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
 968                         datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
 969                         break;
 970
 971                 case RFC2374_HDR_INTFRAG:
 972                         dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
 973                         fg_off = fwnet_get_hdr_fg_off(&ptask->hdr)
 974                                   + ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
 975                         datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
 976                         break;
 977                 }
 978
 979                 if (ptask->dest_node == IEEE1394_ALL_NODES) {
 980                         skb_pull(skb,
 981                                  ptask->max_payload + IEEE1394_GASP_HDR_SIZE);
 982                 } else {
 983                         skb_pull(skb, ptask->max_payload);
 984                 }
 985                 if (ptask->outstanding_pkts > 1) {
 986                         fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_INTFRAG,
 987                                           dg_size, fg_off, datagram_label);
 988                 } else {
 989                         fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_LASTFRAG,
 990                                           dg_size, fg_off, datagram_label);
 991                         ptask->max_payload = skb->len + RFC2374_FRAG_HDR_SIZE;
 992                 }
 993                 fwnet_send_packet(ptask);
 994         }
 995
 996         if (free)
 997                 fwnet_free_ptask(ptask);
 998 }
 999
1000 static void fwnet_transmit_packet_failed(struct fwnet_packet_task *ptask)
1001 {
1002         struct fwnet_device *dev = ptask->dev;
1003         unsigned long flags;
1004         bool free;
1005
1006         spin_lock_irqsave(&dev->lock, flags);
1007
1008         /* One fragment failed; don't try to send remaining fragments. */
1009         ptask->outstanding_pkts = 0;
1010
1011         /* Check whether we or the networking TX soft-IRQ is last user. */
1012         free = ptask->enqueued;
1013         if (free)
1014                 dec_queued_datagrams(dev);
1015
1016         dev->netdev->stats.tx_dropped++;
1017         dev->netdev->stats.tx_errors++;
1018
1019         spin_unlock_irqrestore(&dev->lock, flags);
1020
1021         if (free)
1022                 fwnet_free_ptask(ptask);
1023 }
1024
1025 static void fwnet_write_complete(struct fw_card *card, int rcode,
1026                                  void *payload, size_t length, void *data)
1027 {
1028         struct fwnet_packet_task *ptask = data;
1029         static unsigned long j;
1030         static int last_rcode, errors_skipped;
1031
1032         if (rcode == RCODE_COMPLETE) {
1033                 fwnet_transmit_packet_done(ptask);
1034         } else {
1035                 fwnet_transmit_packet_failed(ptask);
1036
1037                 if (printk_timed_ratelimit(&j,  1000) || rcode != last_rcode) {
1038                         fw_error("fwnet_write_complete: "
1039                                 "failed: %x (skipped %d)\n", rcode, errors_skipped);
1040
1041                         errors_skipped = 0;
1042                         last_rcode = rcode;
1043                 } else
1044                         errors_skipped++;
1045         }
1046 }
1047
1048 static int fwnet_send_packet(struct fwnet_packet_task *ptask)
1049 {
1050         struct fwnet_device *dev;
1051         unsigned tx_len;
1052         struct rfc2734_header *bufhdr;
1053         unsigned long flags;
1054         bool free;
1055
1056         dev = ptask->dev;
1057         tx_len = ptask->max_payload;
1058         switch (fwnet_get_hdr_lf(&ptask->hdr)) {
1059         case RFC2374_HDR_UNFRAG:
1060                 bufhdr = (struct rfc2734_header *)
1061                                 skb_push(ptask->skb, RFC2374_UNFRAG_HDR_SIZE);
1062                 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
1063                 break;
1064
1065         case RFC2374_HDR_FIRSTFRAG:
1066         case RFC2374_HDR_INTFRAG:
1067         case RFC2374_HDR_LASTFRAG:
1068                 bufhdr = (struct rfc2734_header *)
1069                                 skb_push(ptask->skb, RFC2374_FRAG_HDR_SIZE);
1070                 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
1071                 put_unaligned_be32(ptask->hdr.w1, &bufhdr->w1);
1072                 break;
1073
1074         default:
1075                 BUG();
1076         }
1077         if (ptask->dest_node == IEEE1394_ALL_NODES) {
1078                 u8 *p;
1079                 int generation;
1080                 int node_id;
1081
1082                 /* ptask->generation may not have been set yet */
1083                 generation = dev->card->generation;
1084                 smp_rmb();
1085                 node_id = dev->card->node_id;
1086
1087                 p = skb_push(ptask->skb, IEEE1394_GASP_HDR_SIZE);
1088                 put_unaligned_be32(node_id << 16 | IANA_SPECIFIER_ID >> 8, p);
1089                 put_unaligned_be32((IANA_SPECIFIER_ID & 0xff) << 24
1090                                                 | RFC2734_SW_VERSION, &p[4]);
1091
1092                 /* We should not transmit if broadcast_channel.valid == 0. */
1093                 fw_send_request(dev->card, &ptask->transaction,
1094                                 TCODE_STREAM_DATA,
1095                                 fw_stream_packet_destination_id(3,
1096                                                 IEEE1394_BROADCAST_CHANNEL, 0),
1097                                 generation, SCODE_100, 0ULL, ptask->skb->data,
1098                                 tx_len + 8, fwnet_write_complete, ptask);
1099
1100                 spin_lock_irqsave(&dev->lock, flags);
1101
1102                 /* If the AT tasklet already ran, we may be last user. */
1103                 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1104                 if (!free)
1105                         ptask->enqueued = true;
1106                 else
1107                         dec_queued_datagrams(dev);
1108
1109                 spin_unlock_irqrestore(&dev->lock, flags);
1110
1111                 goto out;
1112         }
1113
1114         fw_send_request(dev->card, &ptask->transaction,
1115                         TCODE_WRITE_BLOCK_REQUEST, ptask->dest_node,
1116                         ptask->generation, ptask->speed, ptask->fifo_addr,
1117                         ptask->skb->data, tx_len, fwnet_write_complete, ptask);
1118
1119         spin_lock_irqsave(&dev->lock, flags);
1120
1121         /* If the AT tasklet already ran, we may be last user. */
1122         free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1123         if (!free)
1124                 ptask->enqueued = true;
1125         else
1126                 dec_queued_datagrams(dev);
1127
1128         spin_unlock_irqrestore(&dev->lock, flags);
1129
1130         dev->netdev->trans_start = jiffies;
1131  out:
1132         if (free)
1133                 fwnet_free_ptask(ptask);
1134
1135         return 0;
1136 }
1137
1138 static int fwnet_broadcast_start(struct fwnet_device *dev)
1139 {
1140         struct fw_iso_context *context;
1141         int retval;
1142         unsigned num_packets;
1143         unsigned max_receive;
1144         struct fw_iso_packet packet;
1145         unsigned long offset;
1146         unsigned u;
1147
1148         if (dev->local_fifo == FWNET_NO_FIFO_ADDR) {
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                         goto failed_initial;
1157
1158                 dev->local_fifo = dev->handler.offset;
1159         }
1160
1161         max_receive = 1U << (dev->card->max_receive + 1);
1162         num_packets = (FWNET_ISO_PAGE_COUNT * PAGE_SIZE) / max_receive;
1163
1164         if (!dev->broadcast_rcv_context) {
1165                 void **ptrptr;
1166
1167                 context = fw_iso_context_create(dev->card,
1168                     FW_ISO_CONTEXT_RECEIVE, IEEE1394_BROADCAST_CHANNEL,
1169                     dev->card->link_speed, 8, fwnet_receive_broadcast, dev);
1170                 if (IS_ERR(context)) {
1171                         retval = PTR_ERR(context);
1172                         goto failed_context_create;
1173                 }
1174
1175                 retval = fw_iso_buffer_init(&dev->broadcast_rcv_buffer,
1176                     dev->card, FWNET_ISO_PAGE_COUNT, DMA_FROM_DEVICE);
1177                 if (retval < 0)
1178                         goto failed_buffer_init;
1179
1180                 ptrptr = kmalloc(sizeof(void *) * num_packets, GFP_KERNEL);
1181                 if (!ptrptr) {
1182                         retval = -ENOMEM;
1183                         goto failed_ptrs_alloc;
1184                 }
1185
1186                 dev->broadcast_rcv_buffer_ptrs = ptrptr;
1187                 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++) {
1188                         void *ptr;
1189                         unsigned v;
1190
1191                         ptr = kmap(dev->broadcast_rcv_buffer.pages[u]);
1192                         for (v = 0; v < num_packets / FWNET_ISO_PAGE_COUNT; v++)
1193                                 *ptrptr++ = (void *)
1194                                                 ((char *)ptr + v * max_receive);
1195                 }
1196                 dev->broadcast_rcv_context = context;
1197         } else {
1198                 context = dev->broadcast_rcv_context;
1199         }
1200
1201         packet.payload_length = max_receive;
1202         packet.interrupt = 1;
1203         packet.skip = 0;
1204         packet.tag = 3;
1205         packet.sy = 0;
1206         packet.header_length = IEEE1394_GASP_HDR_SIZE;
1207         offset = 0;
1208
1209         for (u = 0; u < num_packets; u++) {
1210                 retval = fw_iso_context_queue(context, &packet,
1211                                 &dev->broadcast_rcv_buffer, offset);
1212                 if (retval < 0)
1213                         goto failed_rcv_queue;
1214
1215                 offset += max_receive;
1216         }
1217         dev->num_broadcast_rcv_ptrs = num_packets;
1218         dev->rcv_buffer_size = max_receive;
1219         dev->broadcast_rcv_next_ptr = 0U;
1220         retval = fw_iso_context_start(context, -1, 0,
1221                         FW_ISO_CONTEXT_MATCH_ALL_TAGS); /* ??? sync */
1222         if (retval < 0)
1223                 goto failed_rcv_queue;
1224
1225         /* FIXME: adjust it according to the min. speed of all known peers? */
1226         dev->broadcast_xmt_max_payload = IEEE1394_MAX_PAYLOAD_S100
1227                         - IEEE1394_GASP_HDR_SIZE - RFC2374_UNFRAG_HDR_SIZE;
1228         dev->broadcast_state = FWNET_BROADCAST_RUNNING;
1229
1230         return 0;
1231
1232  failed_rcv_queue:
1233         kfree(dev->broadcast_rcv_buffer_ptrs);
1234         dev->broadcast_rcv_buffer_ptrs = NULL;
1235  failed_ptrs_alloc:
1236         fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer, dev->card);
1237  failed_buffer_init:
1238         fw_iso_context_destroy(context);
1239         dev->broadcast_rcv_context = NULL;
1240  failed_context_create:
1241         fw_core_remove_address_handler(&dev->handler);
1242  failed_initial:
1243         dev->local_fifo = FWNET_NO_FIFO_ADDR;
1244
1245         return retval;
1246 }
1247
1248 static void set_carrier_state(struct fwnet_device *dev)
1249 {
1250         if (dev->peer_count > 1)
1251                 netif_carrier_on(dev->netdev);
1252         else
1253                 netif_carrier_off(dev->netdev);
1254 }
1255
1256 /* ifup */
1257 static int fwnet_open(struct net_device *net)
1258 {
1259         struct fwnet_device *dev = netdev_priv(net);
1260         int ret;
1261
1262         if (dev->broadcast_state == FWNET_BROADCAST_ERROR) {
1263                 ret = fwnet_broadcast_start(dev);
1264                 if (ret)
1265                         return ret;
1266         }
1267         netif_start_queue(net);
1268
1269         spin_lock_irq(&dev->lock);
1270         set_carrier_state(dev);
1271         spin_unlock_irq(&dev->lock);
1272
1273         return 0;
1274 }
1275
1276 /* ifdown */
1277 static int fwnet_stop(struct net_device *net)
1278 {
1279         netif_stop_queue(net);
1280
1281         /* Deallocate iso context for use by other applications? */
1282
1283         return 0;
1284 }
1285
1286 static netdev_tx_t fwnet_tx(struct sk_buff *skb, struct net_device *net)
1287 {
1288         struct fwnet_header hdr_buf;
1289         struct fwnet_device *dev = netdev_priv(net);
1290         __be16 proto;
1291         u16 dest_node;
1292         unsigned max_payload;
1293         u16 dg_size;
1294         u16 *datagram_label_ptr;
1295         struct fwnet_packet_task *ptask;
1296         struct fwnet_peer *peer;
1297         unsigned long flags;
1298
1299         spin_lock_irqsave(&dev->lock, flags);
1300
1301         /* Can this happen? */
1302         if (netif_queue_stopped(dev->netdev)) {
1303                 spin_unlock_irqrestore(&dev->lock, flags);
1304
1305                 return NETDEV_TX_BUSY;
1306         }
1307
1308         ptask = kmem_cache_alloc(fwnet_packet_task_cache, GFP_ATOMIC);
1309         if (ptask == NULL)
1310                 goto fail;
1311
1312         skb = skb_share_check(skb, GFP_ATOMIC);
1313         if (!skb)
1314                 goto fail;
1315
1316         /*
1317          * Make a copy of the driver-specific header.
1318          * We might need to rebuild the header on tx failure.
1319          */
1320         memcpy(&hdr_buf, skb->data, sizeof(hdr_buf));
1321         skb_pull(skb, sizeof(hdr_buf));
1322
1323         proto = hdr_buf.h_proto;
1324         dg_size = skb->len;
1325
1326         /*
1327          * Set the transmission type for the packet.  ARP packets and IP
1328          * broadcast packets are sent via GASP.
1329          */
1330         if (memcmp(hdr_buf.h_dest, net->broadcast, FWNET_ALEN) == 0
1331             || proto == htons(ETH_P_ARP)
1332             || (proto == htons(ETH_P_IP)
1333                 && IN_MULTICAST(ntohl(ip_hdr(skb)->daddr)))) {
1334                 max_payload        = dev->broadcast_xmt_max_payload;
1335                 datagram_label_ptr = &dev->broadcast_xmt_datagramlabel;
1336
1337                 ptask->fifo_addr   = FWNET_NO_FIFO_ADDR;
1338                 ptask->generation  = 0;
1339                 ptask->dest_node   = IEEE1394_ALL_NODES;
1340                 ptask->speed       = SCODE_100;
1341         } else {
1342                 __be64 guid = get_unaligned((__be64 *)hdr_buf.h_dest);
1343                 u8 generation;
1344
1345                 peer = fwnet_peer_find_by_guid(dev, be64_to_cpu(guid));
1346                 if (!peer || peer->fifo == FWNET_NO_FIFO_ADDR)
1347                         goto fail;
1348
1349                 generation         = peer->generation;
1350                 dest_node          = peer->node_id;
1351                 max_payload        = peer->max_payload;
1352                 datagram_label_ptr = &peer->datagram_label;
1353
1354                 ptask->fifo_addr   = peer->fifo;
1355                 ptask->generation  = generation;
1356                 ptask->dest_node   = dest_node;
1357                 ptask->speed       = peer->speed;
1358         }
1359
1360         /* If this is an ARP packet, convert it */
1361         if (proto == htons(ETH_P_ARP)) {
1362                 struct arphdr *arp = (struct arphdr *)skb->data;
1363                 unsigned char *arp_ptr = (unsigned char *)(arp + 1);
1364                 struct rfc2734_arp *arp1394 = (struct rfc2734_arp *)skb->data;
1365                 __be32 ipaddr;
1366
1367                 ipaddr = get_unaligned((__be32 *)(arp_ptr + FWNET_ALEN));
1368
1369                 arp1394->hw_addr_len    = RFC2734_HW_ADDR_LEN;
1370                 arp1394->max_rec        = dev->card->max_receive;
1371                 arp1394->sspd           = dev->card->link_speed;
1372
1373                 put_unaligned_be16(dev->local_fifo >> 32,
1374                                    &arp1394->fifo_hi);
1375                 put_unaligned_be32(dev->local_fifo & 0xffffffff,
1376                                    &arp1394->fifo_lo);
1377                 put_unaligned(ipaddr, &arp1394->sip);
1378         }
1379
1380         ptask->hdr.w0 = 0;
1381         ptask->hdr.w1 = 0;
1382         ptask->skb = skb;
1383         ptask->dev = dev;
1384
1385         /* Does it all fit in one packet? */
1386         if (dg_size <= max_payload) {
1387                 fwnet_make_uf_hdr(&ptask->hdr, ntohs(proto));
1388                 ptask->outstanding_pkts = 1;
1389                 max_payload = dg_size + RFC2374_UNFRAG_HDR_SIZE;
1390         } else {
1391                 u16 datagram_label;
1392
1393                 max_payload -= RFC2374_FRAG_OVERHEAD;
1394                 datagram_label = (*datagram_label_ptr)++;
1395                 fwnet_make_ff_hdr(&ptask->hdr, ntohs(proto), dg_size,
1396                                   datagram_label);
1397                 ptask->outstanding_pkts = DIV_ROUND_UP(dg_size, max_payload);
1398                 max_payload += RFC2374_FRAG_HDR_SIZE;
1399         }
1400
1401         if (++dev->queued_datagrams == FWNET_MAX_QUEUED_DATAGRAMS)
1402                 netif_stop_queue(dev->netdev);
1403
1404         spin_unlock_irqrestore(&dev->lock, flags);
1405
1406         ptask->max_payload = max_payload;
1407         ptask->enqueued    = 0;
1408
1409         fwnet_send_packet(ptask);
1410
1411         return NETDEV_TX_OK;
1412
1413  fail:
1414         spin_unlock_irqrestore(&dev->lock, flags);
1415
1416         if (ptask)
1417                 kmem_cache_free(fwnet_packet_task_cache, ptask);
1418
1419         if (skb != NULL)
1420                 dev_kfree_skb(skb);
1421
1422         net->stats.tx_dropped++;
1423         net->stats.tx_errors++;
1424
1425         /*
1426          * FIXME: According to a patch from 2003-02-26, "returning non-zero
1427          * causes serious problems" here, allegedly.  Before that patch,
1428          * -ERRNO was returned which is not appropriate under Linux 2.6.
1429          * Perhaps more needs to be done?  Stop the queue in serious
1430          * conditions and restart it elsewhere?
1431          */
1432         return NETDEV_TX_OK;
1433 }
1434
1435 static int fwnet_change_mtu(struct net_device *net, int new_mtu)
1436 {
1437         if (new_mtu < 68)
1438                 return -EINVAL;
1439
1440         net->mtu = new_mtu;
1441         return 0;
1442 }
1443
1444 static const struct ethtool_ops fwnet_ethtool_ops = {
1445         .get_link       = ethtool_op_get_link,
1446 };
1447
1448 static const struct net_device_ops fwnet_netdev_ops = {
1449         .ndo_open       = fwnet_open,
1450         .ndo_stop       = fwnet_stop,
1451         .ndo_start_xmit = fwnet_tx,
1452         .ndo_change_mtu = fwnet_change_mtu,
1453 };
1454
1455 static void fwnet_init_dev(struct net_device *net)
1456 {
1457         net->header_ops         = &fwnet_header_ops;
1458         net->netdev_ops         = &fwnet_netdev_ops;
1459         net->watchdog_timeo     = 2 * HZ;
1460         net->flags              = IFF_BROADCAST | IFF_MULTICAST;
1461         net->features           = NETIF_F_HIGHDMA;
1462         net->addr_len           = FWNET_ALEN;
1463         net->hard_header_len    = FWNET_HLEN;
1464         net->type               = ARPHRD_IEEE1394;
1465         net->tx_queue_len       = FWNET_TX_QUEUE_LEN;
1466         net->ethtool_ops        = &fwnet_ethtool_ops;
1467 }
1468
1469 /* caller must hold fwnet_device_mutex */
1470 static struct fwnet_device *fwnet_dev_find(struct fw_card *card)
1471 {
1472         struct fwnet_device *dev;
1473
1474         list_for_each_entry(dev, &fwnet_device_list, dev_link)
1475                 if (dev->card == card)
1476                         return dev;
1477
1478         return NULL;
1479 }
1480
1481 static int fwnet_add_peer(struct fwnet_device *dev,
1482                           struct fw_unit *unit, struct fw_device *device)
1483 {
1484         struct fwnet_peer *peer;
1485
1486         peer = kmalloc(sizeof(*peer), GFP_KERNEL);
1487         if (!peer)
1488                 return -ENOMEM;
1489
1490         dev_set_drvdata(&unit->device, peer);
1491
1492         peer->dev = dev;
1493         peer->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4];
1494         peer->fifo = FWNET_NO_FIFO_ADDR;
1495         peer->ip = 0;
1496         INIT_LIST_HEAD(&peer->pd_list);
1497         peer->pdg_size = 0;
1498         peer->datagram_label = 0;
1499         peer->speed = device->max_speed;
1500         peer->max_payload = fwnet_max_payload(device->max_rec, peer->speed);
1501
1502         peer->generation = device->generation;
1503         smp_rmb();
1504         peer->node_id = device->node_id;
1505
1506         spin_lock_irq(&dev->lock);
1507         list_add_tail(&peer->peer_link, &dev->peer_list);
1508         dev->peer_count++;
1509         set_carrier_state(dev);
1510         spin_unlock_irq(&dev->lock);
1511
1512         return 0;
1513 }
1514
1515 static int fwnet_probe(struct device *_dev)
1516 {
1517         struct fw_unit *unit = fw_unit(_dev);
1518         struct fw_device *device = fw_parent_device(unit);
1519         struct fw_card *card = device->card;
1520         struct net_device *net;
1521         bool allocated_netdev = false;
1522         struct fwnet_device *dev;
1523         unsigned max_mtu;
1524         int ret;
1525
1526         mutex_lock(&fwnet_device_mutex);
1527
1528         dev = fwnet_dev_find(card);
1529         if (dev) {
1530                 net = dev->netdev;
1531                 goto have_dev;
1532         }
1533
1534         net = alloc_netdev(sizeof(*dev), "firewire%d", fwnet_init_dev);
1535         if (net == NULL) {
1536                 ret = -ENOMEM;
1537                 goto out;
1538         }
1539
1540         allocated_netdev = true;
1541         SET_NETDEV_DEV(net, card->device);
1542         dev = netdev_priv(net);
1543
1544         spin_lock_init(&dev->lock);
1545         dev->broadcast_state = FWNET_BROADCAST_ERROR;
1546         dev->broadcast_rcv_context = NULL;
1547         dev->broadcast_xmt_max_payload = 0;
1548         dev->broadcast_xmt_datagramlabel = 0;
1549         dev->local_fifo = FWNET_NO_FIFO_ADDR;
1550         dev->queued_datagrams = 0;
1551         INIT_LIST_HEAD(&dev->peer_list);
1552         dev->card = card;
1553         dev->netdev = net;
1554
1555         /*
1556          * Use the RFC 2734 default 1500 octets or the maximum payload
1557          * as initial MTU
1558          */
1559         max_mtu = (1 << (card->max_receive + 1))
1560                   - sizeof(struct rfc2734_header) - IEEE1394_GASP_HDR_SIZE;
1561         net->mtu = min(1500U, max_mtu);
1562
1563         /* Set our hardware address while we're at it */
1564         put_unaligned_be64(card->guid, net->dev_addr);
1565         put_unaligned_be64(~0ULL, net->broadcast);
1566         ret = register_netdev(net);
1567         if (ret) {
1568                 fw_error("Cannot register the driver\n");
1569                 goto out;
1570         }
1571
1572         list_add_tail(&dev->dev_link, &fwnet_device_list);
1573         fw_notify("%s: IPv4 over FireWire on device %016llx\n",
1574                   net->name, (unsigned long long)card->guid);
1575  have_dev:
1576         ret = fwnet_add_peer(dev, unit, device);
1577         if (ret && allocated_netdev) {
1578                 unregister_netdev(net);
1579                 list_del(&dev->dev_link);
1580         }
1581  out:
1582         if (ret && allocated_netdev)
1583                 free_netdev(net);
1584
1585         mutex_unlock(&fwnet_device_mutex);
1586
1587         return ret;
1588 }
1589
1590 static void fwnet_remove_peer(struct fwnet_peer *peer, struct fwnet_device *dev)
1591 {
1592         struct fwnet_partial_datagram *pd, *pd_next;
1593
1594         spin_lock_irq(&dev->lock);
1595         list_del(&peer->peer_link);
1596         dev->peer_count--;
1597         set_carrier_state(dev);
1598         spin_unlock_irq(&dev->lock);
1599
1600         list_for_each_entry_safe(pd, pd_next, &peer->pd_list, pd_link)
1601                 fwnet_pd_delete(pd);
1602
1603         kfree(peer);
1604 }
1605
1606 static int fwnet_remove(struct device *_dev)
1607 {
1608         struct fwnet_peer *peer = dev_get_drvdata(_dev);
1609         struct fwnet_device *dev = peer->dev;
1610         struct net_device *net;
1611         int i;
1612
1613         mutex_lock(&fwnet_device_mutex);
1614
1615         net = dev->netdev;
1616         if (net && peer->ip)
1617                 arp_invalidate(net, peer->ip);
1618
1619         fwnet_remove_peer(peer, dev);
1620
1621         if (list_empty(&dev->peer_list)) {
1622                 unregister_netdev(net);
1623
1624                 if (dev->local_fifo != FWNET_NO_FIFO_ADDR)
1625                         fw_core_remove_address_handler(&dev->handler);
1626                 if (dev->broadcast_rcv_context) {
1627                         fw_iso_context_stop(dev->broadcast_rcv_context);
1628                         fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer,
1629                                               dev->card);
1630                         fw_iso_context_destroy(dev->broadcast_rcv_context);
1631                 }
1632                 for (i = 0; dev->queued_datagrams && i < 5; i++)
1633                         ssleep(1);
1634                 WARN_ON(dev->queued_datagrams);
1635                 list_del(&dev->dev_link);
1636
1637                 free_netdev(net);
1638         }
1639
1640         mutex_unlock(&fwnet_device_mutex);
1641
1642         return 0;
1643 }
1644
1645 /*
1646  * FIXME abort partially sent fragmented datagrams,
1647  * discard partially received fragmented datagrams
1648  */
1649 static void fwnet_update(struct fw_unit *unit)
1650 {
1651         struct fw_device *device = fw_parent_device(unit);
1652         struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1653         int generation;
1654
1655         generation = device->generation;
1656
1657         spin_lock_irq(&peer->dev->lock);
1658         peer->node_id    = device->node_id;
1659         peer->generation = generation;
1660         spin_unlock_irq(&peer->dev->lock);
1661 }
1662
1663 static const struct ieee1394_device_id fwnet_id_table[] = {
1664         {
1665                 .match_flags  = IEEE1394_MATCH_SPECIFIER_ID |
1666                                 IEEE1394_MATCH_VERSION,
1667                 .specifier_id = IANA_SPECIFIER_ID,
1668                 .version      = RFC2734_SW_VERSION,
1669         },
1670         { }
1671 };
1672
1673 static struct fw_driver fwnet_driver = {
1674         .driver = {
1675                 .owner  = THIS_MODULE,
1676                 .name   = "net",
1677                 .bus    = &fw_bus_type,
1678                 .probe  = fwnet_probe,
1679                 .remove = fwnet_remove,
1680         },
1681         .update   = fwnet_update,
1682         .id_table = fwnet_id_table,
1683 };
1684
1685 static const u32 rfc2374_unit_directory_data[] = {
1686         0x00040000,     /* directory_length             */
1687         0x1200005e,     /* unit_specifier_id: IANA      */
1688         0x81000003,     /* textual descriptor offset    */
1689         0x13000001,     /* unit_sw_version: RFC 2734    */
1690         0x81000005,     /* textual descriptor offset    */
1691         0x00030000,     /* descriptor_length            */
1692         0x00000000,     /* text                         */
1693         0x00000000,     /* minimal ASCII, en            */
1694         0x49414e41,     /* I A N A                      */
1695         0x00030000,     /* descriptor_length            */
1696         0x00000000,     /* text                         */
1697         0x00000000,     /* minimal ASCII, en            */
1698         0x49507634,     /* I P v 4                      */
1699 };
1700
1701 static struct fw_descriptor rfc2374_unit_directory = {
1702         .length = ARRAY_SIZE(rfc2374_unit_directory_data),
1703         .key    = (CSR_DIRECTORY | CSR_UNIT) << 24,
1704         .data   = rfc2374_unit_directory_data
1705 };
1706
1707 static int __init fwnet_init(void)
1708 {
1709         int err;
1710
1711         err = fw_core_add_descriptor(&rfc2374_unit_directory);
1712         if (err)
1713                 return err;
1714
1715         fwnet_packet_task_cache = kmem_cache_create("packet_task",
1716                         sizeof(struct fwnet_packet_task), 0, 0, NULL);
1717         if (!fwnet_packet_task_cache) {
1718                 err = -ENOMEM;
1719                 goto out;
1720         }
1721
1722         err = driver_register(&fwnet_driver.driver);
1723         if (!err)
1724                 return 0;
1725
1726         kmem_cache_destroy(fwnet_packet_task_cache);
1727 out:
1728         fw_core_remove_descriptor(&rfc2374_unit_directory);
1729
1730         return err;
1731 }
1732 module_init(fwnet_init);
1733
1734 static void __exit fwnet_cleanup(void)
1735 {
1736         driver_unregister(&fwnet_driver.driver);
1737         kmem_cache_destroy(fwnet_packet_task_cache);
1738         fw_core_remove_descriptor(&rfc2374_unit_directory);
1739 }
1740 module_exit(fwnet_cleanup);
1741
1742 MODULE_AUTHOR("Jay Fenlason <fenlason@redhat.com>");
1743 MODULE_DESCRIPTION("IPv4 over IEEE1394 as per RFC 2734");
1744 MODULE_LICENSE("GPL");
1745 MODULE_DEVICE_TABLE(ieee1394, fwnet_id_table);