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         hdr.w0 = be32_to_cpu(buf[0]);
 681         lf = fwnet_get_hdr_lf(&hdr);
 682         if (lf == RFC2374_HDR_UNFRAG) {
 683                 /*
 684                  * An unfragmented datagram has been received by the ieee1394
 685                  * bus. Build an skbuff around it so we can pass it to the
 686                  * high level network layer.
 687                  */
 688                 ether_type = fwnet_get_hdr_ether_type(&hdr);
 689                 buf++;
 690                 len -= RFC2374_UNFRAG_HDR_SIZE;
 691
 692                 skb = dev_alloc_skb(len + net->hard_header_len + 15);
 693                 if (unlikely(!skb)) {
 694                         fw_error("out of memory\n");
 695                         net->stats.rx_dropped++;
 696
 697                         return -ENOMEM;
 698                 }
 699                 skb_reserve(skb, (net->hard_header_len + 15) & ~15);
 700                 memcpy(skb_put(skb, len), buf, len);
 701
 702                 return fwnet_finish_incoming_packet(net, skb, source_node_id,
 703                                                     is_broadcast, ether_type);
 704         }
 705         /* A datagram fragment has been received, now the fun begins. */
 706         hdr.w1 = ntohl(buf[1]);
 707         buf += 2;
 708         len -= RFC2374_FRAG_HDR_SIZE;
 709         if (lf == RFC2374_HDR_FIRSTFRAG) {
 710                 ether_type = fwnet_get_hdr_ether_type(&hdr);
 711                 fg_off = 0;
 712         } else {
 713                 ether_type = 0;
 714                 fg_off = fwnet_get_hdr_fg_off(&hdr);
 715         }
 716         datagram_label = fwnet_get_hdr_dgl(&hdr);
 717         dg_size = fwnet_get_hdr_dg_size(&hdr); /* ??? + 1 */
 718
 719         spin_lock_irqsave(&dev->lock, flags);
 720
 721         peer = fwnet_peer_find_by_node_id(dev, source_node_id, generation);
 722         if (!peer) {
 723                 retval = -ENOENT;
 724                 goto fail;
 725         }
 726
 727         pd = fwnet_pd_find(peer, datagram_label);
 728         if (pd == NULL) {
 729                 while (peer->pdg_size >= FWNET_MAX_FRAGMENTS) {
 730                         /* remove the oldest */
 731                         fwnet_pd_delete(list_first_entry(&peer->pd_list,
 732                                 struct fwnet_partial_datagram, pd_link));
 733                         peer->pdg_size--;
 734                 }
 735                 pd = fwnet_pd_new(net, peer, datagram_label,
 736                                   dg_size, buf, fg_off, len);
 737                 if (pd == NULL) {
 738                         retval = -ENOMEM;
 739                         goto fail;
 740                 }
 741                 peer->pdg_size++;
 742         } else {
 743                 if (fwnet_frag_overlap(pd, fg_off, len) ||
 744                     pd->datagram_size != dg_size) {
 745                         /*
 746                          * Differing datagram sizes or overlapping fragments,
 747                          * discard old datagram and start a new one.
 748                          */
 749                         fwnet_pd_delete(pd);
 750                         pd = fwnet_pd_new(net, peer, datagram_label,
 751                                           dg_size, buf, fg_off, len);
 752                         if (pd == NULL) {
 753                                 peer->pdg_size--;
 754                                 retval = -ENOMEM;
 755                                 goto fail;
 756                         }
 757                 } else {
 758                         if (!fwnet_pd_update(peer, pd, buf, fg_off, len)) {
 759                                 /*
 760                                  * Couldn't save off fragment anyway
 761                                  * so might as well obliterate the
 762                                  * datagram now.
 763                                  */
 764                                 fwnet_pd_delete(pd);
 765                                 peer->pdg_size--;
 766                                 retval = -ENOMEM;
 767                                 goto fail;
 768                         }
 769                 }
 770         } /* new datagram or add to existing one */
 771
 772         if (lf == RFC2374_HDR_FIRSTFRAG)
 773                 pd->ether_type = ether_type;
 774
 775         if (fwnet_pd_is_complete(pd)) {
 776                 ether_type = pd->ether_type;
 777                 peer->pdg_size--;
 778                 skb = skb_get(pd->skb);
 779                 fwnet_pd_delete(pd);
 780
 781                 spin_unlock_irqrestore(&dev->lock, flags);
 782
 783                 return fwnet_finish_incoming_packet(net, skb, source_node_id,
 784                                                     false, ether_type);
 785         }
 786         /*
 787          * Datagram is not complete, we're done for the
 788          * moment.
 789          */
 790         retval = 0;
 791  fail:
 792         spin_unlock_irqrestore(&dev->lock, flags);
 793
 794         return retval;
 795 }
 796
 797 static void fwnet_receive_packet(struct fw_card *card, struct fw_request *r,
 798                 int tcode, int destination, int source, int generation,
 799                 unsigned long long offset, void *payload, size_t length,
 800                 void *callback_data)
 801 {
 802         struct fwnet_device *dev = callback_data;
 803         int rcode;
 804
 805         if (destination == IEEE1394_ALL_NODES) {
 806                 kfree(r);
 807
 808                 return;
 809         }
 810
 811         if (offset != dev->handler.offset)
 812                 rcode = RCODE_ADDRESS_ERROR;
 813         else if (tcode != TCODE_WRITE_BLOCK_REQUEST)
 814                 rcode = RCODE_TYPE_ERROR;
 815         else if (fwnet_incoming_packet(dev, payload, length,
 816                                        source, generation, false) != 0) {
 817                 fw_error("Incoming packet failure\n");
 818                 rcode = RCODE_CONFLICT_ERROR;
 819         } else
 820                 rcode = RCODE_COMPLETE;
 821
 822         fw_send_response(card, r, rcode);
 823 }
 824
 825 static void fwnet_receive_broadcast(struct fw_iso_context *context,
 826                 u32 cycle, size_t header_length, void *header, void *data)
 827 {
 828         struct fwnet_device *dev;
 829         struct fw_iso_packet packet;
 830         struct fw_card *card;
 831         __be16 *hdr_ptr;
 832         __be32 *buf_ptr;
 833         int retval;
 834         u32 length;
 835         u16 source_node_id;
 836         u32 specifier_id;
 837         u32 ver;
 838         unsigned long offset;
 839         unsigned long flags;
 840
 841         dev = data;
 842         card = dev->card;
 843         hdr_ptr = header;
 844         length = be16_to_cpup(hdr_ptr);
 845
 846         spin_lock_irqsave(&dev->lock, flags);
 847
 848         offset = dev->rcv_buffer_size * dev->broadcast_rcv_next_ptr;
 849         buf_ptr = dev->broadcast_rcv_buffer_ptrs[dev->broadcast_rcv_next_ptr++];
 850         if (dev->broadcast_rcv_next_ptr == dev->num_broadcast_rcv_ptrs)
 851                 dev->broadcast_rcv_next_ptr = 0;
 852
 853         spin_unlock_irqrestore(&dev->lock, flags);
 854
 855         specifier_id =    (be32_to_cpu(buf_ptr[0]) & 0xffff) << 8
 856                         | (be32_to_cpu(buf_ptr[1]) & 0xff000000) >> 24;
 857         ver = be32_to_cpu(buf_ptr[1]) & 0xffffff;
 858         source_node_id = be32_to_cpu(buf_ptr[0]) >> 16;
 859
 860         if (specifier_id == IANA_SPECIFIER_ID && ver == RFC2734_SW_VERSION) {
 861                 buf_ptr += 2;
 862                 length -= IEEE1394_GASP_HDR_SIZE;
 863                 fwnet_incoming_packet(dev, buf_ptr, length,
 864                                       source_node_id, -1, true);
 865         }
 866
 867         packet.payload_length = dev->rcv_buffer_size;
 868         packet.interrupt = 1;
 869         packet.skip = 0;
 870         packet.tag = 3;
 871         packet.sy = 0;
 872         packet.header_length = IEEE1394_GASP_HDR_SIZE;
 873
 874         spin_lock_irqsave(&dev->lock, flags);
 875
 876         retval = fw_iso_context_queue(dev->broadcast_rcv_context, &packet,
 877                                       &dev->broadcast_rcv_buffer, offset);
 878
 879         spin_unlock_irqrestore(&dev->lock, flags);
 880
 881         if (retval >= 0)
 882                 fw_iso_context_queue_flush(dev->broadcast_rcv_context);
 883         else
 884                 fw_error("requeue failed\n");
 885 }
 886
 887 static struct kmem_cache *fwnet_packet_task_cache;
 888
 889 static void fwnet_free_ptask(struct fwnet_packet_task *ptask)
 890 {
 891         dev_kfree_skb_any(ptask->skb);
 892         kmem_cache_free(fwnet_packet_task_cache, ptask);
 893 }
 894
 895 /* Caller must hold dev->lock. */
 896 static void dec_queued_datagrams(struct fwnet_device *dev)
 897 {
 898         if (--dev->queued_datagrams == FWNET_MIN_QUEUED_DATAGRAMS)
 899                 netif_wake_queue(dev->netdev);
 900 }
 901
 902 static int fwnet_send_packet(struct fwnet_packet_task *ptask);
 903
 904 static void fwnet_transmit_packet_done(struct fwnet_packet_task *ptask)
 905 {
 906         struct fwnet_device *dev = ptask->dev;
 907         struct sk_buff *skb = ptask->skb;
 908         unsigned long flags;
 909         bool free;
 910
 911         spin_lock_irqsave(&dev->lock, flags);
 912
 913         ptask->outstanding_pkts--;
 914
 915         /* Check whether we or the networking TX soft-IRQ is last user. */
 916         free = (ptask->outstanding_pkts == 0 && ptask->enqueued);
 917         if (free)
 918                 dec_queued_datagrams(dev);
 919
 920         if (ptask->outstanding_pkts == 0) {
 921                 dev->netdev->stats.tx_packets++;
 922                 dev->netdev->stats.tx_bytes += skb->len;
 923         }
 924
 925         spin_unlock_irqrestore(&dev->lock, flags);
 926
 927         if (ptask->outstanding_pkts > 0) {
 928                 u16 dg_size;
 929                 u16 fg_off;
 930                 u16 datagram_label;
 931                 u16 lf;
 932
 933                 /* Update the ptask to point to the next fragment and send it */
 934                 lf = fwnet_get_hdr_lf(&ptask->hdr);
 935                 switch (lf) {
 936                 case RFC2374_HDR_LASTFRAG:
 937                 case RFC2374_HDR_UNFRAG:
 938                 default:
 939                         fw_error("Outstanding packet %x lf %x, header %x,%x\n",
 940                                  ptask->outstanding_pkts, lf, ptask->hdr.w0,
 941                                  ptask->hdr.w1);
 942                         BUG();
 943
 944                 case RFC2374_HDR_FIRSTFRAG:
 945                         /* Set frag type here for future interior fragments */
 946                         dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
 947                         fg_off = ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
 948                         datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
 949                         break;
 950
 951                 case RFC2374_HDR_INTFRAG:
 952                         dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
 953                         fg_off = fwnet_get_hdr_fg_off(&ptask->hdr)
 954                                   + ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
 955                         datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
 956                         break;
 957                 }
 958
 959                 skb_pull(skb, ptask->max_payload);
 960                 if (ptask->outstanding_pkts > 1) {
 961                         fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_INTFRAG,
 962                                           dg_size, fg_off, datagram_label);
 963                 } else {
 964                         fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_LASTFRAG,
 965                                           dg_size, fg_off, datagram_label);
 966                         ptask->max_payload = skb->len + RFC2374_FRAG_HDR_SIZE;
 967                 }
 968                 fwnet_send_packet(ptask);
 969         }
 970
 971         if (free)
 972                 fwnet_free_ptask(ptask);
 973 }
 974
 975 static void fwnet_transmit_packet_failed(struct fwnet_packet_task *ptask)
 976 {
 977         struct fwnet_device *dev = ptask->dev;
 978         unsigned long flags;
 979         bool free;
 980
 981         spin_lock_irqsave(&dev->lock, flags);
 982
 983         /* One fragment failed; don't try to send remaining fragments. */
 984         ptask->outstanding_pkts = 0;
 985
 986         /* Check whether we or the networking TX soft-IRQ is last user. */
 987         free = ptask->enqueued;
 988         if (free)
 989                 dec_queued_datagrams(dev);
 990
 991         dev->netdev->stats.tx_dropped++;
 992         dev->netdev->stats.tx_errors++;
 993
 994         spin_unlock_irqrestore(&dev->lock, flags);
 995
 996         if (free)
 997                 fwnet_free_ptask(ptask);
 998 }
 999
1000 static void fwnet_write_complete(struct fw_card *card, int rcode,
1001                                  void *payload, size_t length, void *data)
1002 {
1003         struct fwnet_packet_task *ptask = data;
1004         static unsigned long j;
1005         static int last_rcode, errors_skipped;
1006
1007         if (rcode == RCODE_COMPLETE) {
1008                 fwnet_transmit_packet_done(ptask);
1009         } else {
1010                 fwnet_transmit_packet_failed(ptask);
1011
1012                 if (printk_timed_ratelimit(&j,  1000) || rcode != last_rcode) {
1013                         fw_error("fwnet_write_complete: "
1014                                 "failed: %x (skipped %d)\n", rcode, errors_skipped);
1015
1016                         errors_skipped = 0;
1017                         last_rcode = rcode;
1018                 } else
1019                         errors_skipped++;
1020         }
1021 }
1022
1023 static int fwnet_send_packet(struct fwnet_packet_task *ptask)
1024 {
1025         struct fwnet_device *dev;
1026         unsigned tx_len;
1027         struct rfc2734_header *bufhdr;
1028         unsigned long flags;
1029         bool free;
1030
1031         dev = ptask->dev;
1032         tx_len = ptask->max_payload;
1033         switch (fwnet_get_hdr_lf(&ptask->hdr)) {
1034         case RFC2374_HDR_UNFRAG:
1035                 bufhdr = (struct rfc2734_header *)
1036                                 skb_push(ptask->skb, RFC2374_UNFRAG_HDR_SIZE);
1037                 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
1038                 break;
1039
1040         case RFC2374_HDR_FIRSTFRAG:
1041         case RFC2374_HDR_INTFRAG:
1042         case RFC2374_HDR_LASTFRAG:
1043                 bufhdr = (struct rfc2734_header *)
1044                                 skb_push(ptask->skb, RFC2374_FRAG_HDR_SIZE);
1045                 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
1046                 put_unaligned_be32(ptask->hdr.w1, &bufhdr->w1);
1047                 break;
1048
1049         default:
1050                 BUG();
1051         }
1052         if (ptask->dest_node == IEEE1394_ALL_NODES) {
1053                 u8 *p;
1054                 int generation;
1055                 int node_id;
1056
1057                 /* ptask->generation may not have been set yet */
1058                 generation = dev->card->generation;
1059                 smp_rmb();
1060                 node_id = dev->card->node_id;
1061
1062                 p = skb_push(ptask->skb, 8);
1063                 put_unaligned_be32(node_id << 16 | IANA_SPECIFIER_ID >> 8, p);
1064                 put_unaligned_be32((IANA_SPECIFIER_ID & 0xff) << 24
1065                                                 | RFC2734_SW_VERSION, &p[4]);
1066
1067                 /* We should not transmit if broadcast_channel.valid == 0. */
1068                 fw_send_request(dev->card, &ptask->transaction,
1069                                 TCODE_STREAM_DATA,
1070                                 fw_stream_packet_destination_id(3,
1071                                                 IEEE1394_BROADCAST_CHANNEL, 0),
1072                                 generation, SCODE_100, 0ULL, ptask->skb->data,
1073                                 tx_len + 8, fwnet_write_complete, ptask);
1074
1075                 spin_lock_irqsave(&dev->lock, flags);
1076
1077                 /* If the AT tasklet already ran, we may be last user. */
1078                 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1079                 if (!free)
1080                         ptask->enqueued = true;
1081                 else
1082                         dec_queued_datagrams(dev);
1083
1084                 spin_unlock_irqrestore(&dev->lock, flags);
1085
1086                 goto out;
1087         }
1088
1089         fw_send_request(dev->card, &ptask->transaction,
1090                         TCODE_WRITE_BLOCK_REQUEST, ptask->dest_node,
1091                         ptask->generation, ptask->speed, ptask->fifo_addr,
1092                         ptask->skb->data, tx_len, fwnet_write_complete, ptask);
1093
1094         spin_lock_irqsave(&dev->lock, flags);
1095
1096         /* If the AT tasklet already ran, we may be last user. */
1097         free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1098         if (!free)
1099                 ptask->enqueued = true;
1100         else
1101                 dec_queued_datagrams(dev);
1102
1103         spin_unlock_irqrestore(&dev->lock, flags);
1104
1105         dev->netdev->trans_start = jiffies;
1106  out:
1107         if (free)
1108                 fwnet_free_ptask(ptask);
1109
1110         return 0;
1111 }
1112
1113 static int fwnet_broadcast_start(struct fwnet_device *dev)
1114 {
1115         struct fw_iso_context *context;
1116         int retval;
1117         unsigned num_packets;
1118         unsigned max_receive;
1119         struct fw_iso_packet packet;
1120         unsigned long offset;
1121         unsigned u;
1122
1123         if (dev->local_fifo == FWNET_NO_FIFO_ADDR) {
1124                 dev->handler.length = 4096;
1125                 dev->handler.address_callback = fwnet_receive_packet;
1126                 dev->handler.callback_data = dev;
1127
1128                 retval = fw_core_add_address_handler(&dev->handler,
1129                                         &fw_high_memory_region);
1130                 if (retval < 0)
1131                         goto failed_initial;
1132
1133                 dev->local_fifo = dev->handler.offset;
1134         }
1135
1136         max_receive = 1U << (dev->card->max_receive + 1);
1137         num_packets = (FWNET_ISO_PAGE_COUNT * PAGE_SIZE) / max_receive;
1138
1139         if (!dev->broadcast_rcv_context) {
1140                 void **ptrptr;
1141
1142                 context = fw_iso_context_create(dev->card,
1143                     FW_ISO_CONTEXT_RECEIVE, IEEE1394_BROADCAST_CHANNEL,
1144                     dev->card->link_speed, 8, fwnet_receive_broadcast, dev);
1145                 if (IS_ERR(context)) {
1146                         retval = PTR_ERR(context);
1147                         goto failed_context_create;
1148                 }
1149
1150                 retval = fw_iso_buffer_init(&dev->broadcast_rcv_buffer,
1151                     dev->card, FWNET_ISO_PAGE_COUNT, DMA_FROM_DEVICE);
1152                 if (retval < 0)
1153                         goto failed_buffer_init;
1154
1155                 ptrptr = kmalloc(sizeof(void *) * num_packets, GFP_KERNEL);
1156                 if (!ptrptr) {
1157                         retval = -ENOMEM;
1158                         goto failed_ptrs_alloc;
1159                 }
1160
1161                 dev->broadcast_rcv_buffer_ptrs = ptrptr;
1162                 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++) {
1163                         void *ptr;
1164                         unsigned v;
1165
1166                         ptr = kmap(dev->broadcast_rcv_buffer.pages[u]);
1167                         for (v = 0; v < num_packets / FWNET_ISO_PAGE_COUNT; v++)
1168                                 *ptrptr++ = (void *)
1169                                                 ((char *)ptr + v * max_receive);
1170                 }
1171                 dev->broadcast_rcv_context = context;
1172         } else {
1173                 context = dev->broadcast_rcv_context;
1174         }
1175
1176         packet.payload_length = max_receive;
1177         packet.interrupt = 1;
1178         packet.skip = 0;
1179         packet.tag = 3;
1180         packet.sy = 0;
1181         packet.header_length = IEEE1394_GASP_HDR_SIZE;
1182         offset = 0;
1183
1184         for (u = 0; u < num_packets; u++) {
1185                 retval = fw_iso_context_queue(context, &packet,
1186                                 &dev->broadcast_rcv_buffer, offset);
1187                 if (retval < 0)
1188                         goto failed_rcv_queue;
1189
1190                 offset += max_receive;
1191         }
1192         dev->num_broadcast_rcv_ptrs = num_packets;
1193         dev->rcv_buffer_size = max_receive;
1194         dev->broadcast_rcv_next_ptr = 0U;
1195         retval = fw_iso_context_start(context, -1, 0,
1196                         FW_ISO_CONTEXT_MATCH_ALL_TAGS); /* ??? sync */
1197         if (retval < 0)
1198                 goto failed_rcv_queue;
1199
1200         /* FIXME: adjust it according to the min. speed of all known peers? */
1201         dev->broadcast_xmt_max_payload = IEEE1394_MAX_PAYLOAD_S100
1202                         - IEEE1394_GASP_HDR_SIZE - RFC2374_UNFRAG_HDR_SIZE;
1203         dev->broadcast_state = FWNET_BROADCAST_RUNNING;
1204
1205         return 0;
1206
1207  failed_rcv_queue:
1208         kfree(dev->broadcast_rcv_buffer_ptrs);
1209         dev->broadcast_rcv_buffer_ptrs = NULL;
1210  failed_ptrs_alloc:
1211         fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer, dev->card);
1212  failed_buffer_init:
1213         fw_iso_context_destroy(context);
1214         dev->broadcast_rcv_context = NULL;
1215  failed_context_create:
1216         fw_core_remove_address_handler(&dev->handler);
1217  failed_initial:
1218         dev->local_fifo = FWNET_NO_FIFO_ADDR;
1219
1220         return retval;
1221 }
1222
1223 static void set_carrier_state(struct fwnet_device *dev)
1224 {
1225         if (dev->peer_count > 1)
1226                 netif_carrier_on(dev->netdev);
1227         else
1228                 netif_carrier_off(dev->netdev);
1229 }
1230
1231 /* ifup */
1232 static int fwnet_open(struct net_device *net)
1233 {
1234         struct fwnet_device *dev = netdev_priv(net);
1235         int ret;
1236
1237         if (dev->broadcast_state == FWNET_BROADCAST_ERROR) {
1238                 ret = fwnet_broadcast_start(dev);
1239                 if (ret)
1240                         return ret;
1241         }
1242         netif_start_queue(net);
1243
1244         spin_lock_irq(&dev->lock);
1245         set_carrier_state(dev);
1246         spin_unlock_irq(&dev->lock);
1247
1248         return 0;
1249 }
1250
1251 /* ifdown */
1252 static int fwnet_stop(struct net_device *net)
1253 {
1254         netif_stop_queue(net);
1255
1256         /* Deallocate iso context for use by other applications? */
1257
1258         return 0;
1259 }
1260
1261 static netdev_tx_t fwnet_tx(struct sk_buff *skb, struct net_device *net)
1262 {
1263         struct fwnet_header hdr_buf;
1264         struct fwnet_device *dev = netdev_priv(net);
1265         __be16 proto;
1266         u16 dest_node;
1267         unsigned max_payload;
1268         u16 dg_size;
1269         u16 *datagram_label_ptr;
1270         struct fwnet_packet_task *ptask;
1271         struct fwnet_peer *peer;
1272         unsigned long flags;
1273
1274         spin_lock_irqsave(&dev->lock, flags);
1275
1276         /* Can this happen? */
1277         if (netif_queue_stopped(dev->netdev)) {
1278                 spin_unlock_irqrestore(&dev->lock, flags);
1279
1280                 return NETDEV_TX_BUSY;
1281         }
1282
1283         ptask = kmem_cache_alloc(fwnet_packet_task_cache, GFP_ATOMIC);
1284         if (ptask == NULL)
1285                 goto fail;
1286
1287         skb = skb_share_check(skb, GFP_ATOMIC);
1288         if (!skb)
1289                 goto fail;
1290
1291         /*
1292          * Make a copy of the driver-specific header.
1293          * We might need to rebuild the header on tx failure.
1294          */
1295         memcpy(&hdr_buf, skb->data, sizeof(hdr_buf));
1296         skb_pull(skb, sizeof(hdr_buf));
1297
1298         proto = hdr_buf.h_proto;
1299         dg_size = skb->len;
1300
1301         /*
1302          * Set the transmission type for the packet.  ARP packets and IP
1303          * broadcast packets are sent via GASP.
1304          */
1305         if (memcmp(hdr_buf.h_dest, net->broadcast, FWNET_ALEN) == 0
1306             || proto == htons(ETH_P_ARP)
1307             || (proto == htons(ETH_P_IP)
1308                 && IN_MULTICAST(ntohl(ip_hdr(skb)->daddr)))) {
1309                 max_payload        = dev->broadcast_xmt_max_payload;
1310                 datagram_label_ptr = &dev->broadcast_xmt_datagramlabel;
1311
1312                 ptask->fifo_addr   = FWNET_NO_FIFO_ADDR;
1313                 ptask->generation  = 0;
1314                 ptask->dest_node   = IEEE1394_ALL_NODES;
1315                 ptask->speed       = SCODE_100;
1316         } else {
1317                 __be64 guid = get_unaligned((__be64 *)hdr_buf.h_dest);
1318                 u8 generation;
1319
1320                 peer = fwnet_peer_find_by_guid(dev, be64_to_cpu(guid));
1321                 if (!peer || peer->fifo == FWNET_NO_FIFO_ADDR)
1322                         goto fail;
1323
1324                 generation         = peer->generation;
1325                 dest_node          = peer->node_id;
1326                 max_payload        = peer->max_payload;
1327                 datagram_label_ptr = &peer->datagram_label;
1328
1329                 ptask->fifo_addr   = peer->fifo;
1330                 ptask->generation  = generation;
1331                 ptask->dest_node   = dest_node;
1332                 ptask->speed       = peer->speed;
1333         }
1334
1335         /* If this is an ARP packet, convert it */
1336         if (proto == htons(ETH_P_ARP)) {
1337                 struct arphdr *arp = (struct arphdr *)skb->data;
1338                 unsigned char *arp_ptr = (unsigned char *)(arp + 1);
1339                 struct rfc2734_arp *arp1394 = (struct rfc2734_arp *)skb->data;
1340                 __be32 ipaddr;
1341
1342                 ipaddr = get_unaligned((__be32 *)(arp_ptr + FWNET_ALEN));
1343
1344                 arp1394->hw_addr_len    = RFC2734_HW_ADDR_LEN;
1345                 arp1394->max_rec        = dev->card->max_receive;
1346                 arp1394->sspd           = dev->card->link_speed;
1347
1348                 put_unaligned_be16(dev->local_fifo >> 32,
1349                                    &arp1394->fifo_hi);
1350                 put_unaligned_be32(dev->local_fifo & 0xffffffff,
1351                                    &arp1394->fifo_lo);
1352                 put_unaligned(ipaddr, &arp1394->sip);
1353         }
1354
1355         ptask->hdr.w0 = 0;
1356         ptask->hdr.w1 = 0;
1357         ptask->skb = skb;
1358         ptask->dev = dev;
1359
1360         /* Does it all fit in one packet? */
1361         if (dg_size <= max_payload) {
1362                 fwnet_make_uf_hdr(&ptask->hdr, ntohs(proto));
1363                 ptask->outstanding_pkts = 1;
1364                 max_payload = dg_size + RFC2374_UNFRAG_HDR_SIZE;
1365         } else {
1366                 u16 datagram_label;
1367
1368                 max_payload -= RFC2374_FRAG_OVERHEAD;
1369                 datagram_label = (*datagram_label_ptr)++;
1370                 fwnet_make_ff_hdr(&ptask->hdr, ntohs(proto), dg_size,
1371                                   datagram_label);
1372                 ptask->outstanding_pkts = DIV_ROUND_UP(dg_size, max_payload);
1373                 max_payload += RFC2374_FRAG_HDR_SIZE;
1374         }
1375
1376         if (++dev->queued_datagrams == FWNET_MAX_QUEUED_DATAGRAMS)
1377                 netif_stop_queue(dev->netdev);
1378
1379         spin_unlock_irqrestore(&dev->lock, flags);
1380
1381         ptask->max_payload = max_payload;
1382         ptask->enqueued    = 0;
1383
1384         fwnet_send_packet(ptask);
1385
1386         return NETDEV_TX_OK;
1387
1388  fail:
1389         spin_unlock_irqrestore(&dev->lock, flags);
1390
1391         if (ptask)
1392                 kmem_cache_free(fwnet_packet_task_cache, ptask);
1393
1394         if (skb != NULL)
1395                 dev_kfree_skb(skb);
1396
1397         net->stats.tx_dropped++;
1398         net->stats.tx_errors++;
1399
1400         /*
1401          * FIXME: According to a patch from 2003-02-26, "returning non-zero
1402          * causes serious problems" here, allegedly.  Before that patch,
1403          * -ERRNO was returned which is not appropriate under Linux 2.6.
1404          * Perhaps more needs to be done?  Stop the queue in serious
1405          * conditions and restart it elsewhere?
1406          */
1407         return NETDEV_TX_OK;
1408 }
1409
1410 static int fwnet_change_mtu(struct net_device *net, int new_mtu)
1411 {
1412         if (new_mtu < 68)
1413                 return -EINVAL;
1414
1415         net->mtu = new_mtu;
1416         return 0;
1417 }
1418
1419 static const struct ethtool_ops fwnet_ethtool_ops = {
1420         .get_link       = ethtool_op_get_link,
1421 };
1422
1423 static const struct net_device_ops fwnet_netdev_ops = {
1424         .ndo_open       = fwnet_open,
1425         .ndo_stop       = fwnet_stop,
1426         .ndo_start_xmit = fwnet_tx,
1427         .ndo_change_mtu = fwnet_change_mtu,
1428 };
1429
1430 static void fwnet_init_dev(struct net_device *net)
1431 {
1432         net->header_ops         = &fwnet_header_ops;
1433         net->netdev_ops         = &fwnet_netdev_ops;
1434         net->watchdog_timeo     = 2 * HZ;
1435         net->flags              = IFF_BROADCAST | IFF_MULTICAST;
1436         net->features           = NETIF_F_HIGHDMA;
1437         net->addr_len           = FWNET_ALEN;
1438         net->hard_header_len    = FWNET_HLEN;
1439         net->type               = ARPHRD_IEEE1394;
1440         net->tx_queue_len       = FWNET_TX_QUEUE_LEN;
1441         net->ethtool_ops        = &fwnet_ethtool_ops;
1442 }
1443
1444 /* caller must hold fwnet_device_mutex */
1445 static struct fwnet_device *fwnet_dev_find(struct fw_card *card)
1446 {
1447         struct fwnet_device *dev;
1448
1449         list_for_each_entry(dev, &fwnet_device_list, dev_link)
1450                 if (dev->card == card)
1451                         return dev;
1452
1453         return NULL;
1454 }
1455
1456 static int fwnet_add_peer(struct fwnet_device *dev,
1457                           struct fw_unit *unit, struct fw_device *device)
1458 {
1459         struct fwnet_peer *peer;
1460
1461         peer = kmalloc(sizeof(*peer), GFP_KERNEL);
1462         if (!peer)
1463                 return -ENOMEM;
1464
1465         dev_set_drvdata(&unit->device, peer);
1466
1467         peer->dev = dev;
1468         peer->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4];
1469         peer->fifo = FWNET_NO_FIFO_ADDR;
1470         peer->ip = 0;
1471         INIT_LIST_HEAD(&peer->pd_list);
1472         peer->pdg_size = 0;
1473         peer->datagram_label = 0;
1474         peer->speed = device->max_speed;
1475         peer->max_payload = fwnet_max_payload(device->max_rec, peer->speed);
1476
1477         peer->generation = device->generation;
1478         smp_rmb();
1479         peer->node_id = device->node_id;
1480
1481         spin_lock_irq(&dev->lock);
1482         list_add_tail(&peer->peer_link, &dev->peer_list);
1483         dev->peer_count++;
1484         set_carrier_state(dev);
1485         spin_unlock_irq(&dev->lock);
1486
1487         return 0;
1488 }
1489
1490 static int fwnet_probe(struct device *_dev)
1491 {
1492         struct fw_unit *unit = fw_unit(_dev);
1493         struct fw_device *device = fw_parent_device(unit);
1494         struct fw_card *card = device->card;
1495         struct net_device *net;
1496         bool allocated_netdev = false;
1497         struct fwnet_device *dev;
1498         unsigned max_mtu;
1499         int ret;
1500
1501         mutex_lock(&fwnet_device_mutex);
1502
1503         dev = fwnet_dev_find(card);
1504         if (dev) {
1505                 net = dev->netdev;
1506                 goto have_dev;
1507         }
1508
1509         net = alloc_netdev(sizeof(*dev), "firewire%d", fwnet_init_dev);
1510         if (net == NULL) {
1511                 ret = -ENOMEM;
1512                 goto out;
1513         }
1514
1515         allocated_netdev = true;
1516         SET_NETDEV_DEV(net, card->device);
1517         dev = netdev_priv(net);
1518
1519         spin_lock_init(&dev->lock);
1520         dev->broadcast_state = FWNET_BROADCAST_ERROR;
1521         dev->broadcast_rcv_context = NULL;
1522         dev->broadcast_xmt_max_payload = 0;
1523         dev->broadcast_xmt_datagramlabel = 0;
1524         dev->local_fifo = FWNET_NO_FIFO_ADDR;
1525         dev->queued_datagrams = 0;
1526         INIT_LIST_HEAD(&dev->peer_list);
1527         dev->card = card;
1528         dev->netdev = net;
1529
1530         /*
1531          * Use the RFC 2734 default 1500 octets or the maximum payload
1532          * as initial MTU
1533          */
1534         max_mtu = (1 << (card->max_receive + 1))
1535                   - sizeof(struct rfc2734_header) - IEEE1394_GASP_HDR_SIZE;
1536         net->mtu = min(1500U, max_mtu);
1537
1538         /* Set our hardware address while we're at it */
1539         put_unaligned_be64(card->guid, net->dev_addr);
1540         put_unaligned_be64(~0ULL, net->broadcast);
1541         ret = register_netdev(net);
1542         if (ret) {
1543                 fw_error("Cannot register the driver\n");
1544                 goto out;
1545         }
1546
1547         list_add_tail(&dev->dev_link, &fwnet_device_list);
1548         fw_notify("%s: IPv4 over FireWire on device %016llx\n",
1549                   net->name, (unsigned long long)card->guid);
1550  have_dev:
1551         ret = fwnet_add_peer(dev, unit, device);
1552         if (ret && allocated_netdev) {
1553                 unregister_netdev(net);
1554                 list_del(&dev->dev_link);
1555         }
1556  out:
1557         if (ret && allocated_netdev)
1558                 free_netdev(net);
1559
1560         mutex_unlock(&fwnet_device_mutex);
1561
1562         return ret;
1563 }
1564
1565 static void fwnet_remove_peer(struct fwnet_peer *peer, struct fwnet_device *dev)
1566 {
1567         struct fwnet_partial_datagram *pd, *pd_next;
1568
1569         spin_lock_irq(&dev->lock);
1570         list_del(&peer->peer_link);
1571         dev->peer_count--;
1572         set_carrier_state(dev);
1573         spin_unlock_irq(&dev->lock);
1574
1575         list_for_each_entry_safe(pd, pd_next, &peer->pd_list, pd_link)
1576                 fwnet_pd_delete(pd);
1577
1578         kfree(peer);
1579 }
1580
1581 static int fwnet_remove(struct device *_dev)
1582 {
1583         struct fwnet_peer *peer = dev_get_drvdata(_dev);
1584         struct fwnet_device *dev = peer->dev;
1585         struct net_device *net;
1586         int i;
1587
1588         mutex_lock(&fwnet_device_mutex);
1589
1590         net = dev->netdev;
1591         if (net && peer->ip)
1592                 arp_invalidate(net, peer->ip);
1593
1594         fwnet_remove_peer(peer, dev);
1595
1596         if (list_empty(&dev->peer_list)) {
1597                 unregister_netdev(net);
1598
1599                 if (dev->local_fifo != FWNET_NO_FIFO_ADDR)
1600                         fw_core_remove_address_handler(&dev->handler);
1601                 if (dev->broadcast_rcv_context) {
1602                         fw_iso_context_stop(dev->broadcast_rcv_context);
1603                         fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer,
1604                                               dev->card);
1605                         fw_iso_context_destroy(dev->broadcast_rcv_context);
1606                 }
1607                 for (i = 0; dev->queued_datagrams && i < 5; i++)
1608                         ssleep(1);
1609                 WARN_ON(dev->queued_datagrams);
1610                 list_del(&dev->dev_link);
1611
1612                 free_netdev(net);
1613         }
1614
1615         mutex_unlock(&fwnet_device_mutex);
1616
1617         return 0;
1618 }
1619
1620 /*
1621  * FIXME abort partially sent fragmented datagrams,
1622  * discard partially received fragmented datagrams
1623  */
1624 static void fwnet_update(struct fw_unit *unit)
1625 {
1626         struct fw_device *device = fw_parent_device(unit);
1627         struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1628         int generation;
1629
1630         generation = device->generation;
1631
1632         spin_lock_irq(&peer->dev->lock);
1633         peer->node_id    = device->node_id;
1634         peer->generation = generation;
1635         spin_unlock_irq(&peer->dev->lock);
1636 }
1637
1638 static const struct ieee1394_device_id fwnet_id_table[] = {
1639         {
1640                 .match_flags  = IEEE1394_MATCH_SPECIFIER_ID |
1641                                 IEEE1394_MATCH_VERSION,
1642                 .specifier_id = IANA_SPECIFIER_ID,
1643                 .version      = RFC2734_SW_VERSION,
1644         },
1645         { }
1646 };
1647
1648 static struct fw_driver fwnet_driver = {
1649         .driver = {
1650                 .owner  = THIS_MODULE,
1651                 .name   = "net",
1652                 .bus    = &fw_bus_type,
1653                 .probe  = fwnet_probe,
1654                 .remove = fwnet_remove,
1655         },
1656         .update   = fwnet_update,
1657         .id_table = fwnet_id_table,
1658 };
1659
1660 static const u32 rfc2374_unit_directory_data[] = {
1661         0x00040000,     /* directory_length             */
1662         0x1200005e,     /* unit_specifier_id: IANA      */
1663         0x81000003,     /* textual descriptor offset    */
1664         0x13000001,     /* unit_sw_version: RFC 2734    */
1665         0x81000005,     /* textual descriptor offset    */
1666         0x00030000,     /* descriptor_length            */
1667         0x00000000,     /* text                         */
1668         0x00000000,     /* minimal ASCII, en            */
1669         0x49414e41,     /* I A N A                      */
1670         0x00030000,     /* descriptor_length            */
1671         0x00000000,     /* text                         */
1672         0x00000000,     /* minimal ASCII, en            */
1673         0x49507634,     /* I P v 4                      */
1674 };
1675
1676 static struct fw_descriptor rfc2374_unit_directory = {
1677         .length = ARRAY_SIZE(rfc2374_unit_directory_data),
1678         .key    = (CSR_DIRECTORY | CSR_UNIT) << 24,
1679         .data   = rfc2374_unit_directory_data
1680 };
1681
1682 static int __init fwnet_init(void)
1683 {
1684         int err;
1685
1686         err = fw_core_add_descriptor(&rfc2374_unit_directory);
1687         if (err)
1688                 return err;
1689
1690         fwnet_packet_task_cache = kmem_cache_create("packet_task",
1691                         sizeof(struct fwnet_packet_task), 0, 0, NULL);
1692         if (!fwnet_packet_task_cache) {
1693                 err = -ENOMEM;
1694                 goto out;
1695         }
1696
1697         err = driver_register(&fwnet_driver.driver);
1698         if (!err)
1699                 return 0;
1700
1701         kmem_cache_destroy(fwnet_packet_task_cache);
1702 out:
1703         fw_core_remove_descriptor(&rfc2374_unit_directory);
1704
1705         return err;
1706 }
1707 module_init(fwnet_init);
1708
1709 static void __exit fwnet_cleanup(void)
1710 {
1711         driver_unregister(&fwnet_driver.driver);
1712         kmem_cache_destroy(fwnet_packet_task_cache);
1713         fw_core_remove_descriptor(&rfc2374_unit_directory);
1714 }
1715 module_exit(fwnet_cleanup);
1716
1717 MODULE_AUTHOR("Jay Fenlason <fenlason@redhat.com>");
1718 MODULE_DESCRIPTION("IPv4 over IEEE1394 as per RFC 2734");
1719 MODULE_LICENSE("GPL");
1720 MODULE_DEVICE_TABLE(ieee1394, fwnet_id_table);