drivers/firewire/net.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * IPv4 over IEEE 1394, per RFC 2734
   4  * IPv6 over IEEE 1394, per RFC 3146
   5  *
   6  * Copyright (C) 2009 Jay Fenlason <fenlason@redhat.com>
   7  *
   8  * based on eth1394 by Ben Collins et al
   9  */
  10
  11 #include <linux/bug.h>
  12 #include <linux/compiler.h>
  13 #include <linux/delay.h>
  14 #include <linux/device.h>
  15 #include <linux/ethtool.h>
  16 #include <linux/firewire.h>
  17 #include <linux/firewire-constants.h>
  18 #include <linux/highmem.h>
  19 #include <linux/in.h>
  20 #include <linux/ip.h>
  21 #include <linux/jiffies.h>
  22 #include <linux/mod_devicetable.h>
  23 #include <linux/module.h>
  24 #include <linux/moduleparam.h>
  25 #include <linux/mutex.h>
  26 #include <linux/netdevice.h>
  27 #include <linux/skbuff.h>
  28 #include <linux/slab.h>
  29 #include <linux/spinlock.h>
  30
  31 #include <asm/unaligned.h>
  32 #include <net/arp.h>
  33 #include <net/firewire.h>
  34
  35 /* rx limits */
  36 #define FWNET_MAX_FRAGMENTS             30 /* arbitrary, > TX queue depth */
  37 #define FWNET_ISO_PAGE_COUNT            (PAGE_SIZE < 16*1024 ? 4 : 2)
  38
  39 /* tx limits */
  40 #define FWNET_MAX_QUEUED_DATAGRAMS      20 /* < 64 = number of tlabels */
  41 #define FWNET_MIN_QUEUED_DATAGRAMS      10 /* should keep AT DMA busy enough */
  42 #define FWNET_TX_QUEUE_LEN              FWNET_MAX_QUEUED_DATAGRAMS /* ? */
  43
  44 #define IEEE1394_BROADCAST_CHANNEL      31
  45 #define IEEE1394_ALL_NODES              (0xffc0 | 0x003f)
  46 #define IEEE1394_MAX_PAYLOAD_S100       512
  47 #define FWNET_NO_FIFO_ADDR              (~0ULL)
  48
  49 #define IANA_SPECIFIER_ID               0x00005eU
  50 #define RFC2734_SW_VERSION              0x000001U
  51 #define RFC3146_SW_VERSION              0x000002U
  52
  53 #define IEEE1394_GASP_HDR_SIZE  8
  54
  55 #define RFC2374_UNFRAG_HDR_SIZE 4
  56 #define RFC2374_FRAG_HDR_SIZE   8
  57 #define RFC2374_FRAG_OVERHEAD   4
  58
  59 #define RFC2374_HDR_UNFRAG      0       /* unfragmented         */
  60 #define RFC2374_HDR_FIRSTFRAG   1       /* first fragment       */
  61 #define RFC2374_HDR_LASTFRAG    2       /* last fragment        */
  62 #define RFC2374_HDR_INTFRAG     3       /* interior fragment    */
  63
  64 static bool fwnet_hwaddr_is_multicast(u8 *ha)
  65 {
  66         return !!(*ha & 1);
  67 }
  68
  69 /* IPv4 and IPv6 encapsulation header */
  70 struct rfc2734_header {
  71         u32 w0;
  72         u32 w1;
  73 };
  74
  75 #define fwnet_get_hdr_lf(h)             (((h)->w0 & 0xc0000000) >> 30)
  76 #define fwnet_get_hdr_ether_type(h)     (((h)->w0 & 0x0000ffff))
  77 #define fwnet_get_hdr_dg_size(h)        ((((h)->w0 & 0x0fff0000) >> 16) + 1)
  78 #define fwnet_get_hdr_fg_off(h)         (((h)->w0 & 0x00000fff))
  79 #define fwnet_get_hdr_dgl(h)            (((h)->w1 & 0xffff0000) >> 16)
  80
  81 #define fwnet_set_hdr_lf(lf)            ((lf) << 30)
  82 #define fwnet_set_hdr_ether_type(et)    (et)
  83 #define fwnet_set_hdr_dg_size(dgs)      (((dgs) - 1) << 16)
  84 #define fwnet_set_hdr_fg_off(fgo)       (fgo)
  85
  86 #define fwnet_set_hdr_dgl(dgl)          ((dgl) << 16)
  87
  88 static inline void fwnet_make_uf_hdr(struct rfc2734_header *hdr,
  89                 unsigned ether_type)
  90 {
  91         hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_UNFRAG)
  92                   | fwnet_set_hdr_ether_type(ether_type);
  93 }
  94
  95 static inline void fwnet_make_ff_hdr(struct rfc2734_header *hdr,
  96                 unsigned ether_type, unsigned dg_size, unsigned dgl)
  97 {
  98         hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_FIRSTFRAG)
  99                   | fwnet_set_hdr_dg_size(dg_size)
 100                   | fwnet_set_hdr_ether_type(ether_type);
 101         hdr->w1 = fwnet_set_hdr_dgl(dgl);
 102 }
 103
 104 static inline void fwnet_make_sf_hdr(struct rfc2734_header *hdr,
 105                 unsigned lf, unsigned dg_size, unsigned fg_off, unsigned dgl)
 106 {
 107         hdr->w0 = fwnet_set_hdr_lf(lf)
 108                   | fwnet_set_hdr_dg_size(dg_size)
 109                   | fwnet_set_hdr_fg_off(fg_off);
 110         hdr->w1 = fwnet_set_hdr_dgl(dgl);
 111 }
 112
 113 /* This list keeps track of what parts of the datagram have been filled in */
 114 struct fwnet_fragment_info {
 115         struct list_head fi_link;
 116         u16 offset;
 117         u16 len;
 118 };
 119
 120 struct fwnet_partial_datagram {
 121         struct list_head pd_link;
 122         struct list_head fi_list;
 123         struct sk_buff *skb;
 124         /* FIXME Why not use skb->data? */
 125         char *pbuf;
 126         u16 datagram_label;
 127         u16 ether_type;
 128         u16 datagram_size;
 129 };
 130
 131 static DEFINE_MUTEX(fwnet_device_mutex);
 132 static LIST_HEAD(fwnet_device_list);
 133
 134 struct fwnet_device {
 135         struct list_head dev_link;
 136         spinlock_t lock;
 137         enum {
 138                 FWNET_BROADCAST_ERROR,
 139                 FWNET_BROADCAST_RUNNING,
 140                 FWNET_BROADCAST_STOPPED,
 141         } broadcast_state;
 142         struct fw_iso_context *broadcast_rcv_context;
 143         struct fw_iso_buffer broadcast_rcv_buffer;
 144         void **broadcast_rcv_buffer_ptrs;
 145         unsigned broadcast_rcv_next_ptr;
 146         unsigned num_broadcast_rcv_ptrs;
 147         unsigned rcv_buffer_size;
 148         /*
 149          * This value is the maximum unfragmented datagram size that can be
 150          * sent by the hardware.  It already has the GASP overhead and the
 151          * unfragmented datagram header overhead calculated into it.
 152          */
 153         unsigned broadcast_xmt_max_payload;
 154         u16 broadcast_xmt_datagramlabel;
 155
 156         /*
 157          * The CSR address that remote nodes must send datagrams to for us to
 158          * receive them.
 159          */
 160         struct fw_address_handler handler;
 161         u64 local_fifo;
 162
 163         /* Number of tx datagrams that have been queued but not yet acked */
 164         int queued_datagrams;
 165
 166         int peer_count;
 167         struct list_head peer_list;
 168         struct fw_card *card;
 169         struct net_device *netdev;
 170 };
 171
 172 struct fwnet_peer {
 173         struct list_head peer_link;
 174         struct fwnet_device *dev;
 175         u64 guid;
 176
 177         /* guarded by dev->lock */
 178         struct list_head pd_list; /* received partial datagrams */
 179         unsigned pdg_size;        /* pd_list size */
 180
 181         u16 datagram_label;       /* outgoing datagram label */
 182         u16 max_payload;          /* includes RFC2374_FRAG_HDR_SIZE overhead */
 183         int node_id;
 184         int generation;
 185         unsigned speed;
 186 };
 187
 188 /* This is our task struct. It's used for the packet complete callback.  */
 189 struct fwnet_packet_task {
 190         struct fw_transaction transaction;
 191         struct rfc2734_header hdr;
 192         struct sk_buff *skb;
 193         struct fwnet_device *dev;
 194
 195         int outstanding_pkts;
 196         u64 fifo_addr;
 197         u16 dest_node;
 198         u16 max_payload;
 199         u8 generation;
 200         u8 speed;
 201         u8 enqueued;
 202 };
 203
 204 /*
 205  * Get fifo address embedded in hwaddr
 206  */
 207 static __u64 fwnet_hwaddr_fifo(union fwnet_hwaddr *ha)
 208 {
 209         return (u64)get_unaligned_be16(&ha->uc.fifo_hi) << 32
 210                | get_unaligned_be32(&ha->uc.fifo_lo);
 211 }
 212
 213 /*
 214  * saddr == NULL means use device source address.
 215  * daddr == NULL means leave destination address (eg unresolved arp).
 216  */
 217 static int fwnet_header_create(struct sk_buff *skb, struct net_device *net,
 218                         unsigned short type, const void *daddr,
 219                         const void *saddr, unsigned len)
 220 {
 221         struct fwnet_header *h;
 222
 223         h = skb_push(skb, sizeof(*h));
 224         put_unaligned_be16(type, &h->h_proto);
 225
 226         if (net->flags & (IFF_LOOPBACK | IFF_NOARP)) {
 227                 memset(h->h_dest, 0, net->addr_len);
 228
 229                 return net->hard_header_len;
 230         }
 231
 232         if (daddr) {
 233                 memcpy(h->h_dest, daddr, net->addr_len);
 234
 235                 return net->hard_header_len;
 236         }
 237
 238         return -net->hard_header_len;
 239 }
 240
 241 static int fwnet_header_cache(const struct neighbour *neigh,
 242                               struct hh_cache *hh, __be16 type)
 243 {
 244         struct net_device *net;
 245         struct fwnet_header *h;
 246
 247         if (type == cpu_to_be16(ETH_P_802_3))
 248                 return -1;
 249         net = neigh->dev;
 250         h = (struct fwnet_header *)((u8 *)hh->hh_data + HH_DATA_OFF(sizeof(*h)));
 251         h->h_proto = type;
 252         memcpy(h->h_dest, neigh->ha, net->addr_len);
 253
 254         /* Pairs with the READ_ONCE() in neigh_resolve_output(),
 255          * neigh_hh_output() and neigh_update_hhs().
 256          */
 257         smp_store_release(&hh->hh_len, FWNET_HLEN);
 258
 259         return 0;
 260 }
 261
 262 /* Called by Address Resolution module to notify changes in address. */
 263 static void fwnet_header_cache_update(struct hh_cache *hh,
 264                 const struct net_device *net, const unsigned char *haddr)
 265 {
 266         memcpy((u8 *)hh->hh_data + HH_DATA_OFF(FWNET_HLEN), haddr, net->addr_len);
 267 }
 268
 269 static int fwnet_header_parse(const struct sk_buff *skb, unsigned char *haddr)
 270 {
 271         memcpy(haddr, skb->dev->dev_addr, FWNET_ALEN);
 272
 273         return FWNET_ALEN;
 274 }
 275
 276 static const struct header_ops fwnet_header_ops = {
 277         .create         = fwnet_header_create,
 278         .cache          = fwnet_header_cache,
 279         .cache_update   = fwnet_header_cache_update,
 280         .parse          = fwnet_header_parse,
 281 };
 282
 283 /* FIXME: is this correct for all cases? */
 284 static bool fwnet_frag_overlap(struct fwnet_partial_datagram *pd,
 285                                unsigned offset, unsigned len)
 286 {
 287         struct fwnet_fragment_info *fi;
 288         unsigned end = offset + len;
 289
 290         list_for_each_entry(fi, &pd->fi_list, fi_link)
 291                 if (offset < fi->offset + fi->len && end > fi->offset)
 292                         return true;
 293
 294         return false;
 295 }
 296
 297 /* Assumes that new fragment does not overlap any existing fragments */
 298 static struct fwnet_fragment_info *fwnet_frag_new(
 299         struct fwnet_partial_datagram *pd, unsigned offset, unsigned len)
 300 {
 301         struct fwnet_fragment_info *fi, *fi2, *new;
 302         struct list_head *list;
 303
 304         list = &pd->fi_list;
 305         list_for_each_entry(fi, &pd->fi_list, fi_link) {
 306                 if (fi->offset + fi->len == offset) {
 307                         /* The new fragment can be tacked on to the end */
 308                         /* Did the new fragment plug a hole? */
 309                         fi2 = list_entry(fi->fi_link.next,
 310                                          struct fwnet_fragment_info, fi_link);
 311                         if (fi->offset + fi->len == fi2->offset) {
 312                                 /* glue fragments together */
 313                                 fi->len += len + fi2->len;
 314                                 list_del(&fi2->fi_link);
 315                                 kfree(fi2);
 316                         } else {
 317                                 fi->len += len;
 318                         }
 319
 320                         return fi;
 321                 }
 322                 if (offset + len == fi->offset) {
 323                         /* The new fragment can be tacked on to the beginning */
 324                         /* Did the new fragment plug a hole? */
 325                         fi2 = list_entry(fi->fi_link.prev,
 326                                          struct fwnet_fragment_info, fi_link);
 327                         if (fi2->offset + fi2->len == fi->offset) {
 328                                 /* glue fragments together */
 329                                 fi2->len += fi->len + len;
 330                                 list_del(&fi->fi_link);
 331                                 kfree(fi);
 332
 333                                 return fi2;
 334                         }
 335                         fi->offset = offset;
 336                         fi->len += len;
 337
 338                         return fi;
 339                 }
 340                 if (offset > fi->offset + fi->len) {
 341                         list = &fi->fi_link;
 342                         break;
 343                 }
 344                 if (offset + len < fi->offset) {
 345                         list = fi->fi_link.prev;
 346                         break;
 347                 }
 348         }
 349
 350         new = kmalloc(sizeof(*new), GFP_ATOMIC);
 351         if (!new)
 352                 return NULL;
 353
 354         new->offset = offset;
 355         new->len = len;
 356         list_add(&new->fi_link, list);
 357
 358         return new;
 359 }
 360
 361 static struct fwnet_partial_datagram *fwnet_pd_new(struct net_device *net,
 362                 struct fwnet_peer *peer, u16 datagram_label, unsigned dg_size,
 363                 void *frag_buf, unsigned frag_off, unsigned frag_len)
 364 {
 365         struct fwnet_partial_datagram *new;
 366         struct fwnet_fragment_info *fi;
 367
 368         new = kmalloc(sizeof(*new), GFP_ATOMIC);
 369         if (!new)
 370                 goto fail;
 371
 372         INIT_LIST_HEAD(&new->fi_list);
 373         fi = fwnet_frag_new(new, frag_off, frag_len);
 374         if (fi == NULL)
 375                 goto fail_w_new;
 376
 377         new->datagram_label = datagram_label;
 378         new->datagram_size = dg_size;
 379         new->skb = dev_alloc_skb(dg_size + LL_RESERVED_SPACE(net));
 380         if (new->skb == NULL)
 381                 goto fail_w_fi;
 382
 383         skb_reserve(new->skb, LL_RESERVED_SPACE(net));
 384         new->pbuf = skb_put(new->skb, dg_size);
 385         memcpy(new->pbuf + frag_off, frag_buf, frag_len);
 386         list_add_tail(&new->pd_link, &peer->pd_list);
 387
 388         return new;
 389
 390 fail_w_fi:
 391         kfree(fi);
 392 fail_w_new:
 393         kfree(new);
 394 fail:
 395         return NULL;
 396 }
 397
 398 static struct fwnet_partial_datagram *fwnet_pd_find(struct fwnet_peer *peer,
 399                                                     u16 datagram_label)
 400 {
 401         struct fwnet_partial_datagram *pd;
 402
 403         list_for_each_entry(pd, &peer->pd_list, pd_link)
 404                 if (pd->datagram_label == datagram_label)
 405                         return pd;
 406
 407         return NULL;
 408 }
 409
 410
 411 static void fwnet_pd_delete(struct fwnet_partial_datagram *old)
 412 {
 413         struct fwnet_fragment_info *fi, *n;
 414
 415         list_for_each_entry_safe(fi, n, &old->fi_list, fi_link)
 416                 kfree(fi);
 417
 418         list_del(&old->pd_link);
 419         dev_kfree_skb_any(old->skb);
 420         kfree(old);
 421 }
 422
 423 static bool fwnet_pd_update(struct fwnet_peer *peer,
 424                 struct fwnet_partial_datagram *pd, void *frag_buf,
 425                 unsigned frag_off, unsigned frag_len)
 426 {
 427         if (fwnet_frag_new(pd, frag_off, frag_len) == NULL)
 428                 return false;
 429
 430         memcpy(pd->pbuf + frag_off, frag_buf, frag_len);
 431
 432         /*
 433          * Move list entry to beginning of list so that oldest partial
 434          * datagrams percolate to the end of the list
 435          */
 436         list_move_tail(&pd->pd_link, &peer->pd_list);
 437
 438         return true;
 439 }
 440
 441 static bool fwnet_pd_is_complete(struct fwnet_partial_datagram *pd)
 442 {
 443         struct fwnet_fragment_info *fi;
 444
 445         fi = list_entry(pd->fi_list.next, struct fwnet_fragment_info, fi_link);
 446
 447         return fi->len == pd->datagram_size;
 448 }
 449
 450 /* caller must hold dev->lock */
 451 static struct fwnet_peer *fwnet_peer_find_by_guid(struct fwnet_device *dev,
 452                                                   u64 guid)
 453 {
 454         struct fwnet_peer *peer;
 455
 456         list_for_each_entry(peer, &dev->peer_list, peer_link)
 457                 if (peer->guid == guid)
 458                         return peer;
 459
 460         return NULL;
 461 }
 462
 463 /* caller must hold dev->lock */
 464 static struct fwnet_peer *fwnet_peer_find_by_node_id(struct fwnet_device *dev,
 465                                                 int node_id, int generation)
 466 {
 467         struct fwnet_peer *peer;
 468
 469         list_for_each_entry(peer, &dev->peer_list, peer_link)
 470                 if (peer->node_id    == node_id &&
 471                     peer->generation == generation)
 472                         return peer;
 473
 474         return NULL;
 475 }
 476
 477 /* See IEEE 1394-2008 table 6-4, table 8-8, table 16-18. */
 478 static unsigned fwnet_max_payload(unsigned max_rec, unsigned speed)
 479 {
 480         max_rec = min(max_rec, speed + 8);
 481         max_rec = clamp(max_rec, 8U, 11U); /* 512...4096 */
 482
 483         return (1 << (max_rec + 1)) - RFC2374_FRAG_HDR_SIZE;
 484 }
 485
 486
 487 static int fwnet_finish_incoming_packet(struct net_device *net,
 488                                         struct sk_buff *skb, u16 source_node_id,
 489                                         bool is_broadcast, u16 ether_type)
 490 {
 491         struct fwnet_device *dev;
 492         int status;
 493         __be64 guid;
 494
 495         switch (ether_type) {
 496         case ETH_P_ARP:
 497         case ETH_P_IP:
 498 #if IS_ENABLED(CONFIG_IPV6)
 499         case ETH_P_IPV6:
 500 #endif
 501                 break;
 502         default:
 503                 goto err;
 504         }
 505
 506         dev = netdev_priv(net);
 507         /* Write metadata, and then pass to the receive level */
 508         skb->dev = net;
 509         skb->ip_summed = CHECKSUM_NONE;
 510
 511         /*
 512          * Parse the encapsulation header. This actually does the job of
 513          * converting to an ethernet-like pseudo frame header.
 514          */
 515         guid = cpu_to_be64(dev->card->guid);
 516         if (dev_hard_header(skb, net, ether_type,
 517                            is_broadcast ? net->broadcast : net->dev_addr,
 518                            NULL, skb->len) >= 0) {
 519                 struct fwnet_header *eth;
 520                 u16 *rawp;
 521                 __be16 protocol;
 522
 523                 skb_reset_mac_header(skb);
 524                 skb_pull(skb, sizeof(*eth));
 525                 eth = (struct fwnet_header *)skb_mac_header(skb);
 526                 if (fwnet_hwaddr_is_multicast(eth->h_dest)) {
 527                         if (memcmp(eth->h_dest, net->broadcast,
 528                                    net->addr_len) == 0)
 529                                 skb->pkt_type = PACKET_BROADCAST;
 530 #if 0
 531                         else
 532                                 skb->pkt_type = PACKET_MULTICAST;
 533 #endif
 534                 } else {
 535                         if (memcmp(eth->h_dest, net->dev_addr, net->addr_len))
 536                                 skb->pkt_type = PACKET_OTHERHOST;
 537                 }
 538                 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN) {
 539                         protocol = eth->h_proto;
 540                 } else {
 541                         rawp = (u16 *)skb->data;
 542                         if (*rawp == 0xffff)
 543                                 protocol = htons(ETH_P_802_3);
 544                         else
 545                                 protocol = htons(ETH_P_802_2);
 546                 }
 547                 skb->protocol = protocol;
 548         }
 549         status = netif_rx(skb);
 550         if (status == NET_RX_DROP) {
 551                 net->stats.rx_errors++;
 552                 net->stats.rx_dropped++;
 553         } else {
 554                 net->stats.rx_packets++;
 555                 net->stats.rx_bytes += skb->len;
 556         }
 557
 558         return 0;
 559
 560  err:
 561         net->stats.rx_errors++;
 562         net->stats.rx_dropped++;
 563
 564         dev_kfree_skb_any(skb);
 565
 566         return -ENOENT;
 567 }
 568
 569 static int fwnet_incoming_packet(struct fwnet_device *dev, __be32 *buf, int len,
 570                                  int source_node_id, int generation,
 571                                  bool is_broadcast)
 572 {
 573         struct sk_buff *skb;
 574         struct net_device *net = dev->netdev;
 575         struct rfc2734_header hdr;
 576         unsigned lf;
 577         unsigned long flags;
 578         struct fwnet_peer *peer;
 579         struct fwnet_partial_datagram *pd;
 580         int fg_off;
 581         int dg_size;
 582         u16 datagram_label;
 583         int retval;
 584         u16 ether_type;
 585
 586         if (len <= RFC2374_UNFRAG_HDR_SIZE)
 587                 return 0;
 588
 589         hdr.w0 = be32_to_cpu(buf[0]);
 590         lf = fwnet_get_hdr_lf(&hdr);
 591         if (lf == RFC2374_HDR_UNFRAG) {
 592                 /*
 593                  * An unfragmented datagram has been received by the ieee1394
 594                  * bus. Build an skbuff around it so we can pass it to the
 595                  * high level network layer.
 596                  */
 597                 ether_type = fwnet_get_hdr_ether_type(&hdr);
 598                 buf++;
 599                 len -= RFC2374_UNFRAG_HDR_SIZE;
 600
 601                 skb = dev_alloc_skb(len + LL_RESERVED_SPACE(net));
 602                 if (unlikely(!skb)) {
 603                         net->stats.rx_dropped++;
 604
 605                         return -ENOMEM;
 606                 }
 607                 skb_reserve(skb, LL_RESERVED_SPACE(net));
 608                 skb_put_data(skb, buf, len);
 609
 610                 return fwnet_finish_incoming_packet(net, skb, source_node_id,
 611                                                     is_broadcast, ether_type);
 612         }
 613
 614         /* A datagram fragment has been received, now the fun begins. */
 615
 616         if (len <= RFC2374_FRAG_HDR_SIZE)
 617                 return 0;
 618
 619         hdr.w1 = ntohl(buf[1]);
 620         buf += 2;
 621         len -= RFC2374_FRAG_HDR_SIZE;
 622         if (lf == RFC2374_HDR_FIRSTFRAG) {
 623                 ether_type = fwnet_get_hdr_ether_type(&hdr);
 624                 fg_off = 0;
 625         } else {
 626                 ether_type = 0;
 627                 fg_off = fwnet_get_hdr_fg_off(&hdr);
 628         }
 629         datagram_label = fwnet_get_hdr_dgl(&hdr);
 630         dg_size = fwnet_get_hdr_dg_size(&hdr);
 631
 632         if (fg_off + len > dg_size)
 633                 return 0;
 634
 635         spin_lock_irqsave(&dev->lock, flags);
 636
 637         peer = fwnet_peer_find_by_node_id(dev, source_node_id, generation);
 638         if (!peer) {
 639                 retval = -ENOENT;
 640                 goto fail;
 641         }
 642
 643         pd = fwnet_pd_find(peer, datagram_label);
 644         if (pd == NULL) {
 645                 while (peer->pdg_size >= FWNET_MAX_FRAGMENTS) {
 646                         /* remove the oldest */
 647                         fwnet_pd_delete(list_first_entry(&peer->pd_list,
 648                                 struct fwnet_partial_datagram, pd_link));
 649                         peer->pdg_size--;
 650                 }
 651                 pd = fwnet_pd_new(net, peer, datagram_label,
 652                                   dg_size, buf, fg_off, len);
 653                 if (pd == NULL) {
 654                         retval = -ENOMEM;
 655                         goto fail;
 656                 }
 657                 peer->pdg_size++;
 658         } else {
 659                 if (fwnet_frag_overlap(pd, fg_off, len) ||
 660                     pd->datagram_size != dg_size) {
 661                         /*
 662                          * Differing datagram sizes or overlapping fragments,
 663                          * discard old datagram and start a new one.
 664                          */
 665                         fwnet_pd_delete(pd);
 666                         pd = fwnet_pd_new(net, peer, datagram_label,
 667                                           dg_size, buf, fg_off, len);
 668                         if (pd == NULL) {
 669                                 peer->pdg_size--;
 670                                 retval = -ENOMEM;
 671                                 goto fail;
 672                         }
 673                 } else {
 674                         if (!fwnet_pd_update(peer, pd, buf, fg_off, len)) {
 675                                 /*
 676                                  * Couldn't save off fragment anyway
 677                                  * so might as well obliterate the
 678                                  * datagram now.
 679                                  */
 680                                 fwnet_pd_delete(pd);
 681                                 peer->pdg_size--;
 682                                 retval = -ENOMEM;
 683                                 goto fail;
 684                         }
 685                 }
 686         } /* new datagram or add to existing one */
 687
 688         if (lf == RFC2374_HDR_FIRSTFRAG)
 689                 pd->ether_type = ether_type;
 690
 691         if (fwnet_pd_is_complete(pd)) {
 692                 ether_type = pd->ether_type;
 693                 peer->pdg_size--;
 694                 skb = skb_get(pd->skb);
 695                 fwnet_pd_delete(pd);
 696
 697                 spin_unlock_irqrestore(&dev->lock, flags);
 698
 699                 return fwnet_finish_incoming_packet(net, skb, source_node_id,
 700                                                     false, ether_type);
 701         }
 702         /*
 703          * Datagram is not complete, we're done for the
 704          * moment.
 705          */
 706         retval = 0;
 707  fail:
 708         spin_unlock_irqrestore(&dev->lock, flags);
 709
 710         return retval;
 711 }
 712
 713 static void fwnet_receive_packet(struct fw_card *card, struct fw_request *r,
 714                 int tcode, int destination, int source, int generation,
 715                 unsigned long long offset, void *payload, size_t length,
 716                 void *callback_data)
 717 {
 718         struct fwnet_device *dev = callback_data;
 719         int rcode;
 720
 721         if (destination == IEEE1394_ALL_NODES) {
 722                 kfree(r);
 723
 724                 return;
 725         }
 726
 727         if (offset != dev->handler.offset)
 728                 rcode = RCODE_ADDRESS_ERROR;
 729         else if (tcode != TCODE_WRITE_BLOCK_REQUEST)
 730                 rcode = RCODE_TYPE_ERROR;
 731         else if (fwnet_incoming_packet(dev, payload, length,
 732                                        source, generation, false) != 0) {
 733                 dev_err(&dev->netdev->dev, "incoming packet failure\n");
 734                 rcode = RCODE_CONFLICT_ERROR;
 735         } else
 736                 rcode = RCODE_COMPLETE;
 737
 738         fw_send_response(card, r, rcode);
 739 }
 740
 741 static int gasp_source_id(__be32 *p)
 742 {
 743         return be32_to_cpu(p[0]) >> 16;
 744 }
 745
 746 static u32 gasp_specifier_id(__be32 *p)
 747 {
 748         return (be32_to_cpu(p[0]) & 0xffff) << 8 |
 749                (be32_to_cpu(p[1]) & 0xff000000) >> 24;
 750 }
 751
 752 static u32 gasp_version(__be32 *p)
 753 {
 754         return be32_to_cpu(p[1]) & 0xffffff;
 755 }
 756
 757 static void fwnet_receive_broadcast(struct fw_iso_context *context,
 758                 u32 cycle, size_t header_length, void *header, void *data)
 759 {
 760         struct fwnet_device *dev;
 761         struct fw_iso_packet packet;
 762         __be16 *hdr_ptr;
 763         __be32 *buf_ptr;
 764         int retval;
 765         u32 length;
 766         unsigned long offset;
 767         unsigned long flags;
 768
 769         dev = data;
 770         hdr_ptr = header;
 771         length = be16_to_cpup(hdr_ptr);
 772
 773         spin_lock_irqsave(&dev->lock, flags);
 774
 775         offset = dev->rcv_buffer_size * dev->broadcast_rcv_next_ptr;
 776         buf_ptr = dev->broadcast_rcv_buffer_ptrs[dev->broadcast_rcv_next_ptr++];
 777         if (dev->broadcast_rcv_next_ptr == dev->num_broadcast_rcv_ptrs)
 778                 dev->broadcast_rcv_next_ptr = 0;
 779
 780         spin_unlock_irqrestore(&dev->lock, flags);
 781
 782         if (length > IEEE1394_GASP_HDR_SIZE &&
 783             gasp_specifier_id(buf_ptr) == IANA_SPECIFIER_ID &&
 784             (gasp_version(buf_ptr) == RFC2734_SW_VERSION
 785 #if IS_ENABLED(CONFIG_IPV6)
 786              || gasp_version(buf_ptr) == RFC3146_SW_VERSION
 787 #endif
 788             ))
 789                 fwnet_incoming_packet(dev, buf_ptr + 2,
 790                                       length - IEEE1394_GASP_HDR_SIZE,
 791                                       gasp_source_id(buf_ptr),
 792                                       context->card->generation, true);
 793
 794         packet.payload_length = dev->rcv_buffer_size;
 795         packet.interrupt = 1;
 796         packet.skip = 0;
 797         packet.tag = 3;
 798         packet.sy = 0;
 799         packet.header_length = IEEE1394_GASP_HDR_SIZE;
 800
 801         spin_lock_irqsave(&dev->lock, flags);
 802
 803         retval = fw_iso_context_queue(dev->broadcast_rcv_context, &packet,
 804                                       &dev->broadcast_rcv_buffer, offset);
 805
 806         spin_unlock_irqrestore(&dev->lock, flags);
 807
 808         if (retval >= 0)
 809                 fw_iso_context_queue_flush(dev->broadcast_rcv_context);
 810         else
 811                 dev_err(&dev->netdev->dev, "requeue failed\n");
 812 }
 813
 814 static struct kmem_cache *fwnet_packet_task_cache;
 815
 816 static void fwnet_free_ptask(struct fwnet_packet_task *ptask)
 817 {
 818         dev_kfree_skb_any(ptask->skb);
 819         kmem_cache_free(fwnet_packet_task_cache, ptask);
 820 }
 821
 822 /* Caller must hold dev->lock. */
 823 static void dec_queued_datagrams(struct fwnet_device *dev)
 824 {
 825         if (--dev->queued_datagrams == FWNET_MIN_QUEUED_DATAGRAMS)
 826                 netif_wake_queue(dev->netdev);
 827 }
 828
 829 static int fwnet_send_packet(struct fwnet_packet_task *ptask);
 830
 831 static void fwnet_transmit_packet_done(struct fwnet_packet_task *ptask)
 832 {
 833         struct fwnet_device *dev = ptask->dev;
 834         struct sk_buff *skb = ptask->skb;
 835         unsigned long flags;
 836         bool free;
 837
 838         spin_lock_irqsave(&dev->lock, flags);
 839
 840         ptask->outstanding_pkts--;
 841
 842         /* Check whether we or the networking TX soft-IRQ is last user. */
 843         free = (ptask->outstanding_pkts == 0 && ptask->enqueued);
 844         if (free)
 845                 dec_queued_datagrams(dev);
 846
 847         if (ptask->outstanding_pkts == 0) {
 848                 dev->netdev->stats.tx_packets++;
 849                 dev->netdev->stats.tx_bytes += skb->len;
 850         }
 851
 852         spin_unlock_irqrestore(&dev->lock, flags);
 853
 854         if (ptask->outstanding_pkts > 0) {
 855                 u16 dg_size;
 856                 u16 fg_off;
 857                 u16 datagram_label;
 858                 u16 lf;
 859
 860                 /* Update the ptask to point to the next fragment and send it */
 861                 lf = fwnet_get_hdr_lf(&ptask->hdr);
 862                 switch (lf) {
 863                 case RFC2374_HDR_LASTFRAG:
 864                 case RFC2374_HDR_UNFRAG:
 865                 default:
 866                         dev_err(&dev->netdev->dev,
 867                                 "outstanding packet %x lf %x, header %x,%x\n",
 868                                 ptask->outstanding_pkts, lf, ptask->hdr.w0,
 869                                 ptask->hdr.w1);
 870                         BUG();
 871
 872                 case RFC2374_HDR_FIRSTFRAG:
 873                         /* Set frag type here for future interior fragments */
 874                         dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
 875                         fg_off = ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
 876                         datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
 877                         break;
 878
 879                 case RFC2374_HDR_INTFRAG:
 880                         dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
 881                         fg_off = fwnet_get_hdr_fg_off(&ptask->hdr)
 882                                   + ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
 883                         datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
 884                         break;
 885                 }
 886
 887                 if (ptask->dest_node == IEEE1394_ALL_NODES) {
 888                         skb_pull(skb,
 889                                  ptask->max_payload + IEEE1394_GASP_HDR_SIZE);
 890                 } else {
 891                         skb_pull(skb, ptask->max_payload);
 892                 }
 893                 if (ptask->outstanding_pkts > 1) {
 894                         fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_INTFRAG,
 895                                           dg_size, fg_off, datagram_label);
 896                 } else {
 897                         fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_LASTFRAG,
 898                                           dg_size, fg_off, datagram_label);
 899                         ptask->max_payload = skb->len + RFC2374_FRAG_HDR_SIZE;
 900                 }
 901                 fwnet_send_packet(ptask);
 902         }
 903
 904         if (free)
 905                 fwnet_free_ptask(ptask);
 906 }
 907
 908 static void fwnet_transmit_packet_failed(struct fwnet_packet_task *ptask)
 909 {
 910         struct fwnet_device *dev = ptask->dev;
 911         unsigned long flags;
 912         bool free;
 913
 914         spin_lock_irqsave(&dev->lock, flags);
 915
 916         /* One fragment failed; don't try to send remaining fragments. */
 917         ptask->outstanding_pkts = 0;
 918
 919         /* Check whether we or the networking TX soft-IRQ is last user. */
 920         free = ptask->enqueued;
 921         if (free)
 922                 dec_queued_datagrams(dev);
 923
 924         dev->netdev->stats.tx_dropped++;
 925         dev->netdev->stats.tx_errors++;
 926
 927         spin_unlock_irqrestore(&dev->lock, flags);
 928
 929         if (free)
 930                 fwnet_free_ptask(ptask);
 931 }
 932
 933 static void fwnet_write_complete(struct fw_card *card, int rcode,
 934                                  void *payload, size_t length, void *data)
 935 {
 936         struct fwnet_packet_task *ptask = data;
 937         static unsigned long j;
 938         static int last_rcode, errors_skipped;
 939
 940         if (rcode == RCODE_COMPLETE) {
 941                 fwnet_transmit_packet_done(ptask);
 942         } else {
 943                 if (printk_timed_ratelimit(&j,  1000) || rcode != last_rcode) {
 944                         dev_err(&ptask->dev->netdev->dev,
 945                                 "fwnet_write_complete failed: %x (skipped %d)\n",
 946                                 rcode, errors_skipped);
 947
 948                         errors_skipped = 0;
 949                         last_rcode = rcode;
 950                 } else {
 951                         errors_skipped++;
 952                 }
 953                 fwnet_transmit_packet_failed(ptask);
 954         }
 955 }
 956
 957 static int fwnet_send_packet(struct fwnet_packet_task *ptask)
 958 {
 959         struct fwnet_device *dev;
 960         unsigned tx_len;
 961         struct rfc2734_header *bufhdr;
 962         unsigned long flags;
 963         bool free;
 964
 965         dev = ptask->dev;
 966         tx_len = ptask->max_payload;
 967         switch (fwnet_get_hdr_lf(&ptask->hdr)) {
 968         case RFC2374_HDR_UNFRAG:
 969                 bufhdr = skb_push(ptask->skb, RFC2374_UNFRAG_HDR_SIZE);
 970                 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
 971                 break;
 972
 973         case RFC2374_HDR_FIRSTFRAG:
 974         case RFC2374_HDR_INTFRAG:
 975         case RFC2374_HDR_LASTFRAG:
 976                 bufhdr = skb_push(ptask->skb, RFC2374_FRAG_HDR_SIZE);
 977                 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
 978                 put_unaligned_be32(ptask->hdr.w1, &bufhdr->w1);
 979                 break;
 980
 981         default:
 982                 BUG();
 983         }
 984         if (ptask->dest_node == IEEE1394_ALL_NODES) {
 985                 u8 *p;
 986                 int generation;
 987                 int node_id;
 988                 unsigned int sw_version;
 989
 990                 /* ptask->generation may not have been set yet */
 991                 generation = dev->card->generation;
 992                 smp_rmb();
 993                 node_id = dev->card->node_id;
 994
 995                 switch (ptask->skb->protocol) {
 996                 default:
 997                         sw_version = RFC2734_SW_VERSION;
 998                         break;
 999 #if IS_ENABLED(CONFIG_IPV6)
1000                 case htons(ETH_P_IPV6):
1001                         sw_version = RFC3146_SW_VERSION;
1002 #endif
1003                 }
1004
1005                 p = skb_push(ptask->skb, IEEE1394_GASP_HDR_SIZE);
1006                 put_unaligned_be32(node_id << 16 | IANA_SPECIFIER_ID >> 8, p);
1007                 put_unaligned_be32((IANA_SPECIFIER_ID & 0xff) << 24
1008                                                 | sw_version, &p[4]);
1009
1010                 /* We should not transmit if broadcast_channel.valid == 0. */
1011                 fw_send_request(dev->card, &ptask->transaction,
1012                                 TCODE_STREAM_DATA,
1013                                 fw_stream_packet_destination_id(3,
1014                                                 IEEE1394_BROADCAST_CHANNEL, 0),
1015                                 generation, SCODE_100, 0ULL, ptask->skb->data,
1016                                 tx_len + 8, fwnet_write_complete, ptask);
1017
1018                 spin_lock_irqsave(&dev->lock, flags);
1019
1020                 /* If the AT tasklet already ran, we may be last user. */
1021                 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1022                 if (!free)
1023                         ptask->enqueued = true;
1024                 else
1025                         dec_queued_datagrams(dev);
1026
1027                 spin_unlock_irqrestore(&dev->lock, flags);
1028
1029                 goto out;
1030         }
1031
1032         fw_send_request(dev->card, &ptask->transaction,
1033                         TCODE_WRITE_BLOCK_REQUEST, ptask->dest_node,
1034                         ptask->generation, ptask->speed, ptask->fifo_addr,
1035                         ptask->skb->data, tx_len, fwnet_write_complete, ptask);
1036
1037         spin_lock_irqsave(&dev->lock, flags);
1038
1039         /* If the AT tasklet already ran, we may be last user. */
1040         free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1041         if (!free)
1042                 ptask->enqueued = true;
1043         else
1044                 dec_queued_datagrams(dev);
1045
1046         spin_unlock_irqrestore(&dev->lock, flags);
1047
1048         netif_trans_update(dev->netdev);
1049  out:
1050         if (free)
1051                 fwnet_free_ptask(ptask);
1052
1053         return 0;
1054 }
1055
1056 static void fwnet_fifo_stop(struct fwnet_device *dev)
1057 {
1058         if (dev->local_fifo == FWNET_NO_FIFO_ADDR)
1059                 return;
1060
1061         fw_core_remove_address_handler(&dev->handler);
1062         dev->local_fifo = FWNET_NO_FIFO_ADDR;
1063 }
1064
1065 static int fwnet_fifo_start(struct fwnet_device *dev)
1066 {
1067         int retval;
1068
1069         if (dev->local_fifo != FWNET_NO_FIFO_ADDR)
1070                 return 0;
1071
1072         dev->handler.length = 4096;
1073         dev->handler.address_callback = fwnet_receive_packet;
1074         dev->handler.callback_data = dev;
1075
1076         retval = fw_core_add_address_handler(&dev->handler,
1077                                              &fw_high_memory_region);
1078         if (retval < 0)
1079                 return retval;
1080
1081         dev->local_fifo = dev->handler.offset;
1082
1083         return 0;
1084 }
1085
1086 static void __fwnet_broadcast_stop(struct fwnet_device *dev)
1087 {
1088         unsigned u;
1089
1090         if (dev->broadcast_state != FWNET_BROADCAST_ERROR) {
1091                 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++)
1092                         kunmap(dev->broadcast_rcv_buffer.pages[u]);
1093                 fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer, dev->card);
1094         }
1095         if (dev->broadcast_rcv_context) {
1096                 fw_iso_context_destroy(dev->broadcast_rcv_context);
1097                 dev->broadcast_rcv_context = NULL;
1098         }
1099         kfree(dev->broadcast_rcv_buffer_ptrs);
1100         dev->broadcast_rcv_buffer_ptrs = NULL;
1101         dev->broadcast_state = FWNET_BROADCAST_ERROR;
1102 }
1103
1104 static void fwnet_broadcast_stop(struct fwnet_device *dev)
1105 {
1106         if (dev->broadcast_state == FWNET_BROADCAST_ERROR)
1107                 return;
1108         fw_iso_context_stop(dev->broadcast_rcv_context);
1109         __fwnet_broadcast_stop(dev);
1110 }
1111
1112 static int fwnet_broadcast_start(struct fwnet_device *dev)
1113 {
1114         struct fw_iso_context *context;
1115         int retval;
1116         unsigned num_packets;
1117         unsigned max_receive;
1118         struct fw_iso_packet packet;
1119         unsigned long offset;
1120         void **ptrptr;
1121         unsigned u;
1122
1123         if (dev->broadcast_state != FWNET_BROADCAST_ERROR)
1124                 return 0;
1125
1126         max_receive = 1U << (dev->card->max_receive + 1);
1127         num_packets = (FWNET_ISO_PAGE_COUNT * PAGE_SIZE) / max_receive;
1128
1129         ptrptr = kmalloc_array(num_packets, sizeof(void *), GFP_KERNEL);
1130         if (!ptrptr) {
1131                 retval = -ENOMEM;
1132                 goto failed;
1133         }
1134         dev->broadcast_rcv_buffer_ptrs = ptrptr;
1135
1136         context = fw_iso_context_create(dev->card, FW_ISO_CONTEXT_RECEIVE,
1137                                         IEEE1394_BROADCAST_CHANNEL,
1138                                         dev->card->link_speed, 8,
1139                                         fwnet_receive_broadcast, dev);
1140         if (IS_ERR(context)) {
1141                 retval = PTR_ERR(context);
1142                 goto failed;
1143         }
1144
1145         retval = fw_iso_buffer_init(&dev->broadcast_rcv_buffer, dev->card,
1146                                     FWNET_ISO_PAGE_COUNT, DMA_FROM_DEVICE);
1147         if (retval < 0)
1148                 goto failed;
1149
1150         dev->broadcast_state = FWNET_BROADCAST_STOPPED;
1151
1152         for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++) {
1153                 void *ptr;
1154                 unsigned v;
1155
1156                 ptr = kmap(dev->broadcast_rcv_buffer.pages[u]);
1157                 for (v = 0; v < num_packets / FWNET_ISO_PAGE_COUNT; v++)
1158                         *ptrptr++ = (void *) ((char *)ptr + v * max_receive);
1159         }
1160         dev->broadcast_rcv_context = context;
1161
1162         packet.payload_length = max_receive;
1163         packet.interrupt = 1;
1164         packet.skip = 0;
1165         packet.tag = 3;
1166         packet.sy = 0;
1167         packet.header_length = IEEE1394_GASP_HDR_SIZE;
1168         offset = 0;
1169
1170         for (u = 0; u < num_packets; u++) {
1171                 retval = fw_iso_context_queue(context, &packet,
1172                                 &dev->broadcast_rcv_buffer, offset);
1173                 if (retval < 0)
1174                         goto failed;
1175
1176                 offset += max_receive;
1177         }
1178         dev->num_broadcast_rcv_ptrs = num_packets;
1179         dev->rcv_buffer_size = max_receive;
1180         dev->broadcast_rcv_next_ptr = 0U;
1181         retval = fw_iso_context_start(context, -1, 0,
1182                         FW_ISO_CONTEXT_MATCH_ALL_TAGS); /* ??? sync */
1183         if (retval < 0)
1184                 goto failed;
1185
1186         /* FIXME: adjust it according to the min. speed of all known peers? */
1187         dev->broadcast_xmt_max_payload = IEEE1394_MAX_PAYLOAD_S100
1188                         - IEEE1394_GASP_HDR_SIZE - RFC2374_UNFRAG_HDR_SIZE;
1189         dev->broadcast_state = FWNET_BROADCAST_RUNNING;
1190
1191         return 0;
1192
1193  failed:
1194         __fwnet_broadcast_stop(dev);
1195         return retval;
1196 }
1197
1198 static void set_carrier_state(struct fwnet_device *dev)
1199 {
1200         if (dev->peer_count > 1)
1201                 netif_carrier_on(dev->netdev);
1202         else
1203                 netif_carrier_off(dev->netdev);
1204 }
1205
1206 /* ifup */
1207 static int fwnet_open(struct net_device *net)
1208 {
1209         struct fwnet_device *dev = netdev_priv(net);
1210         int ret;
1211
1212         ret = fwnet_broadcast_start(dev);
1213         if (ret)
1214                 return ret;
1215
1216         netif_start_queue(net);
1217
1218         spin_lock_irq(&dev->lock);
1219         set_carrier_state(dev);
1220         spin_unlock_irq(&dev->lock);
1221
1222         return 0;
1223 }
1224
1225 /* ifdown */
1226 static int fwnet_stop(struct net_device *net)
1227 {
1228         struct fwnet_device *dev = netdev_priv(net);
1229
1230         netif_stop_queue(net);
1231         fwnet_broadcast_stop(dev);
1232
1233         return 0;
1234 }
1235
1236 static netdev_tx_t fwnet_tx(struct sk_buff *skb, struct net_device *net)
1237 {
1238         struct fwnet_header hdr_buf;
1239         struct fwnet_device *dev = netdev_priv(net);
1240         __be16 proto;
1241         u16 dest_node;
1242         unsigned max_payload;
1243         u16 dg_size;
1244         u16 *datagram_label_ptr;
1245         struct fwnet_packet_task *ptask;
1246         struct fwnet_peer *peer;
1247         unsigned long flags;
1248
1249         spin_lock_irqsave(&dev->lock, flags);
1250
1251         /* Can this happen? */
1252         if (netif_queue_stopped(dev->netdev)) {
1253                 spin_unlock_irqrestore(&dev->lock, flags);
1254
1255                 return NETDEV_TX_BUSY;
1256         }
1257
1258         ptask = kmem_cache_alloc(fwnet_packet_task_cache, GFP_ATOMIC);
1259         if (ptask == NULL)
1260                 goto fail;
1261
1262         skb = skb_share_check(skb, GFP_ATOMIC);
1263         if (!skb)
1264                 goto fail;
1265
1266         /*
1267          * Make a copy of the driver-specific header.
1268          * We might need to rebuild the header on tx failure.
1269          */
1270         memcpy(&hdr_buf, skb->data, sizeof(hdr_buf));
1271         proto = hdr_buf.h_proto;
1272
1273         switch (proto) {
1274         case htons(ETH_P_ARP):
1275         case htons(ETH_P_IP):
1276 #if IS_ENABLED(CONFIG_IPV6)
1277         case htons(ETH_P_IPV6):
1278 #endif
1279                 break;
1280         default:
1281                 goto fail;
1282         }
1283
1284         skb_pull(skb, sizeof(hdr_buf));
1285         dg_size = skb->len;
1286
1287         /*
1288          * Set the transmission type for the packet.  ARP packets and IP
1289          * broadcast packets are sent via GASP.
1290          */
1291         if (fwnet_hwaddr_is_multicast(hdr_buf.h_dest)) {
1292                 max_payload        = dev->broadcast_xmt_max_payload;
1293                 datagram_label_ptr = &dev->broadcast_xmt_datagramlabel;
1294
1295                 ptask->fifo_addr   = FWNET_NO_FIFO_ADDR;
1296                 ptask->generation  = 0;
1297                 ptask->dest_node   = IEEE1394_ALL_NODES;
1298                 ptask->speed       = SCODE_100;
1299         } else {
1300                 union fwnet_hwaddr *ha = (union fwnet_hwaddr *)hdr_buf.h_dest;
1301                 __be64 guid = get_unaligned(&ha->uc.uniq_id);
1302                 u8 generation;
1303
1304                 peer = fwnet_peer_find_by_guid(dev, be64_to_cpu(guid));
1305                 if (!peer)
1306                         goto fail;
1307
1308                 generation         = peer->generation;
1309                 dest_node          = peer->node_id;
1310                 max_payload        = peer->max_payload;
1311                 datagram_label_ptr = &peer->datagram_label;
1312
1313                 ptask->fifo_addr   = fwnet_hwaddr_fifo(ha);
1314                 ptask->generation  = generation;
1315                 ptask->dest_node   = dest_node;
1316                 ptask->speed       = peer->speed;
1317         }
1318
1319         ptask->hdr.w0 = 0;
1320         ptask->hdr.w1 = 0;
1321         ptask->skb = skb;
1322         ptask->dev = dev;
1323
1324         /* Does it all fit in one packet? */
1325         if (dg_size <= max_payload) {
1326                 fwnet_make_uf_hdr(&ptask->hdr, ntohs(proto));
1327                 ptask->outstanding_pkts = 1;
1328                 max_payload = dg_size + RFC2374_UNFRAG_HDR_SIZE;
1329         } else {
1330                 u16 datagram_label;
1331
1332                 max_payload -= RFC2374_FRAG_OVERHEAD;
1333                 datagram_label = (*datagram_label_ptr)++;
1334                 fwnet_make_ff_hdr(&ptask->hdr, ntohs(proto), dg_size,
1335                                   datagram_label);
1336                 ptask->outstanding_pkts = DIV_ROUND_UP(dg_size, max_payload);
1337                 max_payload += RFC2374_FRAG_HDR_SIZE;
1338         }
1339
1340         if (++dev->queued_datagrams == FWNET_MAX_QUEUED_DATAGRAMS)
1341                 netif_stop_queue(dev->netdev);
1342
1343         spin_unlock_irqrestore(&dev->lock, flags);
1344
1345         ptask->max_payload = max_payload;
1346         ptask->enqueued    = 0;
1347
1348         fwnet_send_packet(ptask);
1349
1350         return NETDEV_TX_OK;
1351
1352  fail:
1353         spin_unlock_irqrestore(&dev->lock, flags);
1354
1355         if (ptask)
1356                 kmem_cache_free(fwnet_packet_task_cache, ptask);
1357
1358         if (skb != NULL)
1359                 dev_kfree_skb(skb);
1360
1361         net->stats.tx_dropped++;
1362         net->stats.tx_errors++;
1363
1364         /*
1365          * FIXME: According to a patch from 2003-02-26, "returning non-zero
1366          * causes serious problems" here, allegedly.  Before that patch,
1367          * -ERRNO was returned which is not appropriate under Linux 2.6.
1368          * Perhaps more needs to be done?  Stop the queue in serious
1369          * conditions and restart it elsewhere?
1370          */
1371         return NETDEV_TX_OK;
1372 }
1373
1374 static const struct ethtool_ops fwnet_ethtool_ops = {
1375         .get_link       = ethtool_op_get_link,
1376 };
1377
1378 static const struct net_device_ops fwnet_netdev_ops = {
1379         .ndo_open       = fwnet_open,
1380         .ndo_stop       = fwnet_stop,
1381         .ndo_start_xmit = fwnet_tx,
1382 };
1383
1384 static void fwnet_init_dev(struct net_device *net)
1385 {
1386         net->header_ops         = &fwnet_header_ops;
1387         net->netdev_ops         = &fwnet_netdev_ops;
1388         net->watchdog_timeo     = 2 * HZ;
1389         net->flags              = IFF_BROADCAST | IFF_MULTICAST;
1390         net->features           = NETIF_F_HIGHDMA;
1391         net->addr_len           = FWNET_ALEN;
1392         net->hard_header_len    = FWNET_HLEN;
1393         net->type               = ARPHRD_IEEE1394;
1394         net->tx_queue_len       = FWNET_TX_QUEUE_LEN;
1395         net->ethtool_ops        = &fwnet_ethtool_ops;
1396 }
1397
1398 /* caller must hold fwnet_device_mutex */
1399 static struct fwnet_device *fwnet_dev_find(struct fw_card *card)
1400 {
1401         struct fwnet_device *dev;
1402
1403         list_for_each_entry(dev, &fwnet_device_list, dev_link)
1404                 if (dev->card == card)
1405                         return dev;
1406
1407         return NULL;
1408 }
1409
1410 static int fwnet_add_peer(struct fwnet_device *dev,
1411                           struct fw_unit *unit, struct fw_device *device)
1412 {
1413         struct fwnet_peer *peer;
1414
1415         peer = kmalloc(sizeof(*peer), GFP_KERNEL);
1416         if (!peer)
1417                 return -ENOMEM;
1418
1419         dev_set_drvdata(&unit->device, peer);
1420
1421         peer->dev = dev;
1422         peer->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4];
1423         INIT_LIST_HEAD(&peer->pd_list);
1424         peer->pdg_size = 0;
1425         peer->datagram_label = 0;
1426         peer->speed = device->max_speed;
1427         peer->max_payload = fwnet_max_payload(device->max_rec, peer->speed);
1428
1429         peer->generation = device->generation;
1430         smp_rmb();
1431         peer->node_id = device->node_id;
1432
1433         spin_lock_irq(&dev->lock);
1434         list_add_tail(&peer->peer_link, &dev->peer_list);
1435         dev->peer_count++;
1436         set_carrier_state(dev);
1437         spin_unlock_irq(&dev->lock);
1438
1439         return 0;
1440 }
1441
1442 static int fwnet_probe(struct fw_unit *unit,
1443                        const struct ieee1394_device_id *id)
1444 {
1445         struct fw_device *device = fw_parent_device(unit);
1446         struct fw_card *card = device->card;
1447         struct net_device *net;
1448         bool allocated_netdev = false;
1449         struct fwnet_device *dev;
1450         int ret;
1451         union fwnet_hwaddr *ha;
1452
1453         mutex_lock(&fwnet_device_mutex);
1454
1455         dev = fwnet_dev_find(card);
1456         if (dev) {
1457                 net = dev->netdev;
1458                 goto have_dev;
1459         }
1460
1461         net = alloc_netdev(sizeof(*dev), "firewire%d", NET_NAME_UNKNOWN,
1462                            fwnet_init_dev);
1463         if (net == NULL) {
1464                 mutex_unlock(&fwnet_device_mutex);
1465                 return -ENOMEM;
1466         }
1467
1468         allocated_netdev = true;
1469         SET_NETDEV_DEV(net, card->device);
1470         dev = netdev_priv(net);
1471
1472         spin_lock_init(&dev->lock);
1473         dev->broadcast_state = FWNET_BROADCAST_ERROR;
1474         dev->broadcast_rcv_context = NULL;
1475         dev->broadcast_xmt_max_payload = 0;
1476         dev->broadcast_xmt_datagramlabel = 0;
1477         dev->local_fifo = FWNET_NO_FIFO_ADDR;
1478         dev->queued_datagrams = 0;
1479         INIT_LIST_HEAD(&dev->peer_list);
1480         dev->card = card;
1481         dev->netdev = net;
1482
1483         ret = fwnet_fifo_start(dev);
1484         if (ret < 0)
1485                 goto out;
1486         dev->local_fifo = dev->handler.offset;
1487
1488         /*
1489          * default MTU: RFC 2734 cl. 4, RFC 3146 cl. 4
1490          * maximum MTU: RFC 2734 cl. 4.2, fragment encapsulation header's
1491          *              maximum possible datagram_size + 1 = 0xfff + 1
1492          */
1493         net->mtu = 1500U;
1494         net->min_mtu = ETH_MIN_MTU;
1495         net->max_mtu = 4096U;
1496
1497         /* Set our hardware address while we're at it */
1498         ha = (union fwnet_hwaddr *)net->dev_addr;
1499         put_unaligned_be64(card->guid, &ha->uc.uniq_id);
1500         ha->uc.max_rec = dev->card->max_receive;
1501         ha->uc.sspd = dev->card->link_speed;
1502         put_unaligned_be16(dev->local_fifo >> 32, &ha->uc.fifo_hi);
1503         put_unaligned_be32(dev->local_fifo & 0xffffffff, &ha->uc.fifo_lo);
1504
1505         memset(net->broadcast, -1, net->addr_len);
1506
1507         ret = register_netdev(net);
1508         if (ret)
1509                 goto out;
1510
1511         list_add_tail(&dev->dev_link, &fwnet_device_list);
1512         dev_notice(&net->dev, "IP over IEEE 1394 on card %s\n",
1513                    dev_name(card->device));
1514  have_dev:
1515         ret = fwnet_add_peer(dev, unit, device);
1516         if (ret && allocated_netdev) {
1517                 unregister_netdev(net);
1518                 list_del(&dev->dev_link);
1519  out:
1520                 fwnet_fifo_stop(dev);
1521                 free_netdev(net);
1522         }
1523
1524         mutex_unlock(&fwnet_device_mutex);
1525
1526         return ret;
1527 }
1528
1529 /*
1530  * FIXME abort partially sent fragmented datagrams,
1531  * discard partially received fragmented datagrams
1532  */
1533 static void fwnet_update(struct fw_unit *unit)
1534 {
1535         struct fw_device *device = fw_parent_device(unit);
1536         struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1537         int generation;
1538
1539         generation = device->generation;
1540
1541         spin_lock_irq(&peer->dev->lock);
1542         peer->node_id    = device->node_id;
1543         peer->generation = generation;
1544         spin_unlock_irq(&peer->dev->lock);
1545 }
1546
1547 static void fwnet_remove_peer(struct fwnet_peer *peer, struct fwnet_device *dev)
1548 {
1549         struct fwnet_partial_datagram *pd, *pd_next;
1550
1551         spin_lock_irq(&dev->lock);
1552         list_del(&peer->peer_link);
1553         dev->peer_count--;
1554         set_carrier_state(dev);
1555         spin_unlock_irq(&dev->lock);
1556
1557         list_for_each_entry_safe(pd, pd_next, &peer->pd_list, pd_link)
1558                 fwnet_pd_delete(pd);
1559
1560         kfree(peer);
1561 }
1562
1563 static void fwnet_remove(struct fw_unit *unit)
1564 {
1565         struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1566         struct fwnet_device *dev = peer->dev;
1567         struct net_device *net;
1568         int i;
1569
1570         mutex_lock(&fwnet_device_mutex);
1571
1572         net = dev->netdev;
1573
1574         fwnet_remove_peer(peer, dev);
1575
1576         if (list_empty(&dev->peer_list)) {
1577                 unregister_netdev(net);
1578
1579                 fwnet_fifo_stop(dev);
1580
1581                 for (i = 0; dev->queued_datagrams && i < 5; i++)
1582                         ssleep(1);
1583                 WARN_ON(dev->queued_datagrams);
1584                 list_del(&dev->dev_link);
1585
1586                 free_netdev(net);
1587         }
1588
1589         mutex_unlock(&fwnet_device_mutex);
1590 }
1591
1592 static const struct ieee1394_device_id fwnet_id_table[] = {
1593         {
1594                 .match_flags  = IEEE1394_MATCH_SPECIFIER_ID |
1595                                 IEEE1394_MATCH_VERSION,
1596                 .specifier_id = IANA_SPECIFIER_ID,
1597                 .version      = RFC2734_SW_VERSION,
1598         },
1599 #if IS_ENABLED(CONFIG_IPV6)
1600         {
1601                 .match_flags  = IEEE1394_MATCH_SPECIFIER_ID |
1602                                 IEEE1394_MATCH_VERSION,
1603                 .specifier_id = IANA_SPECIFIER_ID,
1604                 .version      = RFC3146_SW_VERSION,
1605         },
1606 #endif
1607         { }
1608 };
1609
1610 static struct fw_driver fwnet_driver = {
1611         .driver = {
1612                 .owner  = THIS_MODULE,
1613                 .name   = KBUILD_MODNAME,
1614                 .bus    = &fw_bus_type,
1615         },
1616         .probe    = fwnet_probe,
1617         .update   = fwnet_update,
1618         .remove   = fwnet_remove,
1619         .id_table = fwnet_id_table,
1620 };
1621
1622 static const u32 rfc2374_unit_directory_data[] = {
1623         0x00040000,     /* directory_length             */
1624         0x1200005e,     /* unit_specifier_id: IANA      */
1625         0x81000003,     /* textual descriptor offset    */
1626         0x13000001,     /* unit_sw_version: RFC 2734    */
1627         0x81000005,     /* textual descriptor offset    */
1628         0x00030000,     /* descriptor_length            */
1629         0x00000000,     /* text                         */
1630         0x00000000,     /* minimal ASCII, en            */
1631         0x49414e41,     /* I A N A                      */
1632         0x00030000,     /* descriptor_length            */
1633         0x00000000,     /* text                         */
1634         0x00000000,     /* minimal ASCII, en            */
1635         0x49507634,     /* I P v 4                      */
1636 };
1637
1638 static struct fw_descriptor rfc2374_unit_directory = {
1639         .length = ARRAY_SIZE(rfc2374_unit_directory_data),
1640         .key    = (CSR_DIRECTORY | CSR_UNIT) << 24,
1641         .data   = rfc2374_unit_directory_data
1642 };
1643
1644 #if IS_ENABLED(CONFIG_IPV6)
1645 static const u32 rfc3146_unit_directory_data[] = {
1646         0x00040000,     /* directory_length             */
1647         0x1200005e,     /* unit_specifier_id: IANA      */
1648         0x81000003,     /* textual descriptor offset    */
1649         0x13000002,     /* unit_sw_version: RFC 3146    */
1650         0x81000005,     /* textual descriptor offset    */
1651         0x00030000,     /* descriptor_length            */
1652         0x00000000,     /* text                         */
1653         0x00000000,     /* minimal ASCII, en            */
1654         0x49414e41,     /* I A N A                      */
1655         0x00030000,     /* descriptor_length            */
1656         0x00000000,     /* text                         */
1657         0x00000000,     /* minimal ASCII, en            */
1658         0x49507636,     /* I P v 6                      */
1659 };
1660
1661 static struct fw_descriptor rfc3146_unit_directory = {
1662         .length = ARRAY_SIZE(rfc3146_unit_directory_data),
1663         .key    = (CSR_DIRECTORY | CSR_UNIT) << 24,
1664         .data   = rfc3146_unit_directory_data
1665 };
1666 #endif
1667
1668 static int __init fwnet_init(void)
1669 {
1670         int err;
1671
1672         err = fw_core_add_descriptor(&rfc2374_unit_directory);
1673         if (err)
1674                 return err;
1675
1676 #if IS_ENABLED(CONFIG_IPV6)
1677         err = fw_core_add_descriptor(&rfc3146_unit_directory);
1678         if (err)
1679                 goto out;
1680 #endif
1681
1682         fwnet_packet_task_cache = kmem_cache_create("packet_task",
1683                         sizeof(struct fwnet_packet_task), 0, 0, NULL);
1684         if (!fwnet_packet_task_cache) {
1685                 err = -ENOMEM;
1686                 goto out2;
1687         }
1688
1689         err = driver_register(&fwnet_driver.driver);
1690         if (!err)
1691                 return 0;
1692
1693         kmem_cache_destroy(fwnet_packet_task_cache);
1694 out2:
1695 #if IS_ENABLED(CONFIG_IPV6)
1696         fw_core_remove_descriptor(&rfc3146_unit_directory);
1697 out:
1698 #endif
1699         fw_core_remove_descriptor(&rfc2374_unit_directory);
1700
1701         return err;
1702 }
1703 module_init(fwnet_init);
1704
1705 static void __exit fwnet_cleanup(void)
1706 {
1707         driver_unregister(&fwnet_driver.driver);
1708         kmem_cache_destroy(fwnet_packet_task_cache);
1709 #if IS_ENABLED(CONFIG_IPV6)
1710         fw_core_remove_descriptor(&rfc3146_unit_directory);
1711 #endif
1712         fw_core_remove_descriptor(&rfc2374_unit_directory);
1713 }
1714 module_exit(fwnet_cleanup);
1715
1716 MODULE_AUTHOR("Jay Fenlason <fenlason@redhat.com>");
1717 MODULE_DESCRIPTION("IP over IEEE1394 as per RFC 2734/3146");
1718 MODULE_LICENSE("GPL");
1719 MODULE_DEVICE_TABLE(ieee1394, fwnet_id_table);