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  * saddr == NULL means use device source address.
 206  * daddr == NULL means leave destination address (eg unresolved arp).
 207  */
 208 static int fwnet_header_create(struct sk_buff *skb, struct net_device *net,
 209                         unsigned short type, const void *daddr,
 210                         const void *saddr, unsigned len)
 211 {
 212         struct fwnet_header *h;
 213
 214         h = skb_push(skb, sizeof(*h));
 215         put_unaligned_be16(type, &h->h_proto);
 216
 217         if (net->flags & (IFF_LOOPBACK | IFF_NOARP)) {
 218                 memset(h->h_dest, 0, net->addr_len);
 219
 220                 return net->hard_header_len;
 221         }
 222
 223         if (daddr) {
 224                 memcpy(h->h_dest, daddr, net->addr_len);
 225
 226                 return net->hard_header_len;
 227         }
 228
 229         return -net->hard_header_len;
 230 }
 231
 232 static int fwnet_header_cache(const struct neighbour *neigh,
 233                               struct hh_cache *hh, __be16 type)
 234 {
 235         struct net_device *net;
 236         struct fwnet_header *h;
 237
 238         if (type == cpu_to_be16(ETH_P_802_3))
 239                 return -1;
 240         net = neigh->dev;
 241         h = (struct fwnet_header *)((u8 *)hh->hh_data + HH_DATA_OFF(sizeof(*h)));
 242         h->h_proto = type;
 243         memcpy(h->h_dest, neigh->ha, net->addr_len);
 244
 245         /* Pairs with the READ_ONCE() in neigh_resolve_output(),
 246          * neigh_hh_output() and neigh_update_hhs().
 247          */
 248         smp_store_release(&hh->hh_len, FWNET_HLEN);
 249
 250         return 0;
 251 }
 252
 253 /* Called by Address Resolution module to notify changes in address. */
 254 static void fwnet_header_cache_update(struct hh_cache *hh,
 255                 const struct net_device *net, const unsigned char *haddr)
 256 {
 257         memcpy((u8 *)hh->hh_data + HH_DATA_OFF(FWNET_HLEN), haddr, net->addr_len);
 258 }
 259
 260 static int fwnet_header_parse(const struct sk_buff *skb, unsigned char *haddr)
 261 {
 262         memcpy(haddr, skb->dev->dev_addr, FWNET_ALEN);
 263
 264         return FWNET_ALEN;
 265 }
 266
 267 static const struct header_ops fwnet_header_ops = {
 268         .create         = fwnet_header_create,
 269         .cache          = fwnet_header_cache,
 270         .cache_update   = fwnet_header_cache_update,
 271         .parse          = fwnet_header_parse,
 272 };
 273
 274 /* FIXME: is this correct for all cases? */
 275 static bool fwnet_frag_overlap(struct fwnet_partial_datagram *pd,
 276                                unsigned offset, unsigned len)
 277 {
 278         struct fwnet_fragment_info *fi;
 279         unsigned end = offset + len;
 280
 281         list_for_each_entry(fi, &pd->fi_list, fi_link)
 282                 if (offset < fi->offset + fi->len && end > fi->offset)
 283                         return true;
 284
 285         return false;
 286 }
 287
 288 /* Assumes that new fragment does not overlap any existing fragments */
 289 static struct fwnet_fragment_info *fwnet_frag_new(
 290         struct fwnet_partial_datagram *pd, unsigned offset, unsigned len)
 291 {
 292         struct fwnet_fragment_info *fi, *fi2, *new;
 293         struct list_head *list;
 294
 295         list = &pd->fi_list;
 296         list_for_each_entry(fi, &pd->fi_list, fi_link) {
 297                 if (fi->offset + fi->len == offset) {
 298                         /* The new fragment can be tacked on to the end */
 299                         /* Did the new fragment plug a hole? */
 300                         fi2 = list_entry(fi->fi_link.next,
 301                                          struct fwnet_fragment_info, fi_link);
 302                         if (fi->offset + fi->len == fi2->offset) {
 303                                 /* glue fragments together */
 304                                 fi->len += len + fi2->len;
 305                                 list_del(&fi2->fi_link);
 306                                 kfree(fi2);
 307                         } else {
 308                                 fi->len += len;
 309                         }
 310
 311                         return fi;
 312                 }
 313                 if (offset + len == fi->offset) {
 314                         /* The new fragment can be tacked on to the beginning */
 315                         /* Did the new fragment plug a hole? */
 316                         fi2 = list_entry(fi->fi_link.prev,
 317                                          struct fwnet_fragment_info, fi_link);
 318                         if (fi2->offset + fi2->len == fi->offset) {
 319                                 /* glue fragments together */
 320                                 fi2->len += fi->len + len;
 321                                 list_del(&fi->fi_link);
 322                                 kfree(fi);
 323
 324                                 return fi2;
 325                         }
 326                         fi->offset = offset;
 327                         fi->len += len;
 328
 329                         return fi;
 330                 }
 331                 if (offset > fi->offset + fi->len) {
 332                         list = &fi->fi_link;
 333                         break;
 334                 }
 335                 if (offset + len < fi->offset) {
 336                         list = fi->fi_link.prev;
 337                         break;
 338                 }
 339         }
 340
 341         new = kmalloc(sizeof(*new), GFP_ATOMIC);
 342         if (!new)
 343                 return NULL;
 344
 345         new->offset = offset;
 346         new->len = len;
 347         list_add(&new->fi_link, list);
 348
 349         return new;
 350 }
 351
 352 static struct fwnet_partial_datagram *fwnet_pd_new(struct net_device *net,
 353                 struct fwnet_peer *peer, u16 datagram_label, unsigned dg_size,
 354                 void *frag_buf, unsigned frag_off, unsigned frag_len)
 355 {
 356         struct fwnet_partial_datagram *new;
 357         struct fwnet_fragment_info *fi;
 358
 359         new = kmalloc(sizeof(*new), GFP_ATOMIC);
 360         if (!new)
 361                 goto fail;
 362
 363         INIT_LIST_HEAD(&new->fi_list);
 364         fi = fwnet_frag_new(new, frag_off, frag_len);
 365         if (fi == NULL)
 366                 goto fail_w_new;
 367
 368         new->datagram_label = datagram_label;
 369         new->datagram_size = dg_size;
 370         new->skb = dev_alloc_skb(dg_size + LL_RESERVED_SPACE(net));
 371         if (new->skb == NULL)
 372                 goto fail_w_fi;
 373
 374         skb_reserve(new->skb, LL_RESERVED_SPACE(net));
 375         new->pbuf = skb_put(new->skb, dg_size);
 376         memcpy(new->pbuf + frag_off, frag_buf, frag_len);
 377         list_add_tail(&new->pd_link, &peer->pd_list);
 378
 379         return new;
 380
 381 fail_w_fi:
 382         kfree(fi);
 383 fail_w_new:
 384         kfree(new);
 385 fail:
 386         return NULL;
 387 }
 388
 389 static struct fwnet_partial_datagram *fwnet_pd_find(struct fwnet_peer *peer,
 390                                                     u16 datagram_label)
 391 {
 392         struct fwnet_partial_datagram *pd;
 393
 394         list_for_each_entry(pd, &peer->pd_list, pd_link)
 395                 if (pd->datagram_label == datagram_label)
 396                         return pd;
 397
 398         return NULL;
 399 }
 400
 401
 402 static void fwnet_pd_delete(struct fwnet_partial_datagram *old)
 403 {
 404         struct fwnet_fragment_info *fi, *n;
 405
 406         list_for_each_entry_safe(fi, n, &old->fi_list, fi_link)
 407                 kfree(fi);
 408
 409         list_del(&old->pd_link);
 410         dev_kfree_skb_any(old->skb);
 411         kfree(old);
 412 }
 413
 414 static bool fwnet_pd_update(struct fwnet_peer *peer,
 415                 struct fwnet_partial_datagram *pd, void *frag_buf,
 416                 unsigned frag_off, unsigned frag_len)
 417 {
 418         if (fwnet_frag_new(pd, frag_off, frag_len) == NULL)
 419                 return false;
 420
 421         memcpy(pd->pbuf + frag_off, frag_buf, frag_len);
 422
 423         /*
 424          * Move list entry to beginning of list so that oldest partial
 425          * datagrams percolate to the end of the list
 426          */
 427         list_move_tail(&pd->pd_link, &peer->pd_list);
 428
 429         return true;
 430 }
 431
 432 static bool fwnet_pd_is_complete(struct fwnet_partial_datagram *pd)
 433 {
 434         struct fwnet_fragment_info *fi;
 435
 436         fi = list_entry(pd->fi_list.next, struct fwnet_fragment_info, fi_link);
 437
 438         return fi->len == pd->datagram_size;
 439 }
 440
 441 /* caller must hold dev->lock */
 442 static struct fwnet_peer *fwnet_peer_find_by_guid(struct fwnet_device *dev,
 443                                                   u64 guid)
 444 {
 445         struct fwnet_peer *peer;
 446
 447         list_for_each_entry(peer, &dev->peer_list, peer_link)
 448                 if (peer->guid == guid)
 449                         return peer;
 450
 451         return NULL;
 452 }
 453
 454 /* caller must hold dev->lock */
 455 static struct fwnet_peer *fwnet_peer_find_by_node_id(struct fwnet_device *dev,
 456                                                 int node_id, int generation)
 457 {
 458         struct fwnet_peer *peer;
 459
 460         list_for_each_entry(peer, &dev->peer_list, peer_link)
 461                 if (peer->node_id    == node_id &&
 462                     peer->generation == generation)
 463                         return peer;
 464
 465         return NULL;
 466 }
 467
 468 /* See IEEE 1394-2008 table 6-4, table 8-8, table 16-18. */
 469 static unsigned fwnet_max_payload(unsigned max_rec, unsigned speed)
 470 {
 471         max_rec = min(max_rec, speed + 8);
 472         max_rec = clamp(max_rec, 8U, 11U); /* 512...4096 */
 473
 474         return (1 << (max_rec + 1)) - RFC2374_FRAG_HDR_SIZE;
 475 }
 476
 477
 478 static int fwnet_finish_incoming_packet(struct net_device *net,
 479                                         struct sk_buff *skb, u16 source_node_id,
 480                                         bool is_broadcast, u16 ether_type)
 481 {
 482         int status;
 483
 484         switch (ether_type) {
 485         case ETH_P_ARP:
 486         case ETH_P_IP:
 487 #if IS_ENABLED(CONFIG_IPV6)
 488         case ETH_P_IPV6:
 489 #endif
 490                 break;
 491         default:
 492                 goto err;
 493         }
 494
 495         /* Write metadata, and then pass to the receive level */
 496         skb->dev = net;
 497         skb->ip_summed = CHECKSUM_NONE;
 498
 499         /*
 500          * Parse the encapsulation header. This actually does the job of
 501          * converting to an ethernet-like pseudo frame header.
 502          */
 503         if (dev_hard_header(skb, net, ether_type,
 504                            is_broadcast ? net->broadcast : net->dev_addr,
 505                            NULL, skb->len) >= 0) {
 506                 struct fwnet_header *eth;
 507                 u16 *rawp;
 508                 __be16 protocol;
 509
 510                 skb_reset_mac_header(skb);
 511                 skb_pull(skb, sizeof(*eth));
 512                 eth = (struct fwnet_header *)skb_mac_header(skb);
 513                 if (fwnet_hwaddr_is_multicast(eth->h_dest)) {
 514                         if (memcmp(eth->h_dest, net->broadcast,
 515                                    net->addr_len) == 0)
 516                                 skb->pkt_type = PACKET_BROADCAST;
 517 #if 0
 518                         else
 519                                 skb->pkt_type = PACKET_MULTICAST;
 520 #endif
 521                 } else {
 522                         if (memcmp(eth->h_dest, net->dev_addr, net->addr_len))
 523                                 skb->pkt_type = PACKET_OTHERHOST;
 524                 }
 525                 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN) {
 526                         protocol = eth->h_proto;
 527                 } else {
 528                         rawp = (u16 *)skb->data;
 529                         if (*rawp == 0xffff)
 530                                 protocol = htons(ETH_P_802_3);
 531                         else
 532                                 protocol = htons(ETH_P_802_2);
 533                 }
 534                 skb->protocol = protocol;
 535         }
 536         status = netif_rx(skb);
 537         if (status == NET_RX_DROP) {
 538                 net->stats.rx_errors++;
 539                 net->stats.rx_dropped++;
 540         } else {
 541                 net->stats.rx_packets++;
 542                 net->stats.rx_bytes += skb->len;
 543         }
 544
 545         return 0;
 546
 547  err:
 548         net->stats.rx_errors++;
 549         net->stats.rx_dropped++;
 550
 551         dev_kfree_skb_any(skb);
 552
 553         return -ENOENT;
 554 }
 555
 556 static int fwnet_incoming_packet(struct fwnet_device *dev, __be32 *buf, int len,
 557                                  int source_node_id, int generation,
 558                                  bool is_broadcast)
 559 {
 560         struct sk_buff *skb;
 561         struct net_device *net = dev->netdev;
 562         struct rfc2734_header hdr;
 563         unsigned lf;
 564         unsigned long flags;
 565         struct fwnet_peer *peer;
 566         struct fwnet_partial_datagram *pd;
 567         int fg_off;
 568         int dg_size;
 569         u16 datagram_label;
 570         int retval;
 571         u16 ether_type;
 572
 573         if (len <= RFC2374_UNFRAG_HDR_SIZE)
 574                 return 0;
 575
 576         hdr.w0 = be32_to_cpu(buf[0]);
 577         lf = fwnet_get_hdr_lf(&hdr);
 578         if (lf == RFC2374_HDR_UNFRAG) {
 579                 /*
 580                  * An unfragmented datagram has been received by the ieee1394
 581                  * bus. Build an skbuff around it so we can pass it to the
 582                  * high level network layer.
 583                  */
 584                 ether_type = fwnet_get_hdr_ether_type(&hdr);
 585                 buf++;
 586                 len -= RFC2374_UNFRAG_HDR_SIZE;
 587
 588                 skb = dev_alloc_skb(len + LL_RESERVED_SPACE(net));
 589                 if (unlikely(!skb)) {
 590                         net->stats.rx_dropped++;
 591
 592                         return -ENOMEM;
 593                 }
 594                 skb_reserve(skb, LL_RESERVED_SPACE(net));
 595                 skb_put_data(skb, buf, len);
 596
 597                 return fwnet_finish_incoming_packet(net, skb, source_node_id,
 598                                                     is_broadcast, ether_type);
 599         }
 600
 601         /* A datagram fragment has been received, now the fun begins. */
 602
 603         if (len <= RFC2374_FRAG_HDR_SIZE)
 604                 return 0;
 605
 606         hdr.w1 = ntohl(buf[1]);
 607         buf += 2;
 608         len -= RFC2374_FRAG_HDR_SIZE;
 609         if (lf == RFC2374_HDR_FIRSTFRAG) {
 610                 ether_type = fwnet_get_hdr_ether_type(&hdr);
 611                 fg_off = 0;
 612         } else {
 613                 ether_type = 0;
 614                 fg_off = fwnet_get_hdr_fg_off(&hdr);
 615         }
 616         datagram_label = fwnet_get_hdr_dgl(&hdr);
 617         dg_size = fwnet_get_hdr_dg_size(&hdr);
 618
 619         if (fg_off + len > dg_size)
 620                 return 0;
 621
 622         spin_lock_irqsave(&dev->lock, flags);
 623
 624         peer = fwnet_peer_find_by_node_id(dev, source_node_id, generation);
 625         if (!peer) {
 626                 retval = -ENOENT;
 627                 goto fail;
 628         }
 629
 630         pd = fwnet_pd_find(peer, datagram_label);
 631         if (pd == NULL) {
 632                 while (peer->pdg_size >= FWNET_MAX_FRAGMENTS) {
 633                         /* remove the oldest */
 634                         fwnet_pd_delete(list_first_entry(&peer->pd_list,
 635                                 struct fwnet_partial_datagram, pd_link));
 636                         peer->pdg_size--;
 637                 }
 638                 pd = fwnet_pd_new(net, peer, datagram_label,
 639                                   dg_size, buf, fg_off, len);
 640                 if (pd == NULL) {
 641                         retval = -ENOMEM;
 642                         goto fail;
 643                 }
 644                 peer->pdg_size++;
 645         } else {
 646                 if (fwnet_frag_overlap(pd, fg_off, len) ||
 647                     pd->datagram_size != dg_size) {
 648                         /*
 649                          * Differing datagram sizes or overlapping fragments,
 650                          * discard old datagram and start a new one.
 651                          */
 652                         fwnet_pd_delete(pd);
 653                         pd = fwnet_pd_new(net, peer, datagram_label,
 654                                           dg_size, buf, fg_off, len);
 655                         if (pd == NULL) {
 656                                 peer->pdg_size--;
 657                                 retval = -ENOMEM;
 658                                 goto fail;
 659                         }
 660                 } else {
 661                         if (!fwnet_pd_update(peer, pd, buf, fg_off, len)) {
 662                                 /*
 663                                  * Couldn't save off fragment anyway
 664                                  * so might as well obliterate the
 665                                  * datagram now.
 666                                  */
 667                                 fwnet_pd_delete(pd);
 668                                 peer->pdg_size--;
 669                                 retval = -ENOMEM;
 670                                 goto fail;
 671                         }
 672                 }
 673         } /* new datagram or add to existing one */
 674
 675         if (lf == RFC2374_HDR_FIRSTFRAG)
 676                 pd->ether_type = ether_type;
 677
 678         if (fwnet_pd_is_complete(pd)) {
 679                 ether_type = pd->ether_type;
 680                 peer->pdg_size--;
 681                 skb = skb_get(pd->skb);
 682                 fwnet_pd_delete(pd);
 683
 684                 spin_unlock_irqrestore(&dev->lock, flags);
 685
 686                 return fwnet_finish_incoming_packet(net, skb, source_node_id,
 687                                                     false, ether_type);
 688         }
 689         /*
 690          * Datagram is not complete, we're done for the
 691          * moment.
 692          */
 693         retval = 0;
 694  fail:
 695         spin_unlock_irqrestore(&dev->lock, flags);
 696
 697         return retval;
 698 }
 699
 700 static void fwnet_receive_packet(struct fw_card *card, struct fw_request *r,
 701                 int tcode, int destination, int source, int generation,
 702                 unsigned long long offset, void *payload, size_t length,
 703                 void *callback_data)
 704 {
 705         struct fwnet_device *dev = callback_data;
 706         int rcode;
 707
 708         if (destination == IEEE1394_ALL_NODES) {
 709                 // Although the response to the broadcast packet is not necessarily required, the
 710                 // fw_send_response() function should still be called to maintain the reference
 711                 // counting of the object. In the case, the call of function just releases the
 712                 // object as a result to decrease the reference counting.
 713                 rcode = RCODE_COMPLETE;
 714         } else if (offset != dev->handler.offset) {
 715                 rcode = RCODE_ADDRESS_ERROR;
 716         } else if (tcode != TCODE_WRITE_BLOCK_REQUEST) {
 717                 rcode = RCODE_TYPE_ERROR;
 718         } else if (fwnet_incoming_packet(dev, payload, length,
 719                                          source, generation, false) != 0) {
 720                 dev_err(&dev->netdev->dev, "incoming packet failure\n");
 721                 rcode = RCODE_CONFLICT_ERROR;
 722         } else {
 723                 rcode = RCODE_COMPLETE;
 724         }
 725
 726         fw_send_response(card, r, rcode);
 727 }
 728
 729 static int gasp_source_id(__be32 *p)
 730 {
 731         return be32_to_cpu(p[0]) >> 16;
 732 }
 733
 734 static u32 gasp_specifier_id(__be32 *p)
 735 {
 736         return (be32_to_cpu(p[0]) & 0xffff) << 8 |
 737                (be32_to_cpu(p[1]) & 0xff000000) >> 24;
 738 }
 739
 740 static u32 gasp_version(__be32 *p)
 741 {
 742         return be32_to_cpu(p[1]) & 0xffffff;
 743 }
 744
 745 static void fwnet_receive_broadcast(struct fw_iso_context *context,
 746                 u32 cycle, size_t header_length, void *header, void *data)
 747 {
 748         struct fwnet_device *dev;
 749         struct fw_iso_packet packet;
 750         __be16 *hdr_ptr;
 751         __be32 *buf_ptr;
 752         int retval;
 753         u32 length;
 754         unsigned long offset;
 755         unsigned long flags;
 756
 757         dev = data;
 758         hdr_ptr = header;
 759         length = be16_to_cpup(hdr_ptr);
 760
 761         spin_lock_irqsave(&dev->lock, flags);
 762
 763         offset = dev->rcv_buffer_size * dev->broadcast_rcv_next_ptr;
 764         buf_ptr = dev->broadcast_rcv_buffer_ptrs[dev->broadcast_rcv_next_ptr++];
 765         if (dev->broadcast_rcv_next_ptr == dev->num_broadcast_rcv_ptrs)
 766                 dev->broadcast_rcv_next_ptr = 0;
 767
 768         spin_unlock_irqrestore(&dev->lock, flags);
 769
 770         if (length > IEEE1394_GASP_HDR_SIZE &&
 771             gasp_specifier_id(buf_ptr) == IANA_SPECIFIER_ID &&
 772             (gasp_version(buf_ptr) == RFC2734_SW_VERSION
 773 #if IS_ENABLED(CONFIG_IPV6)
 774              || gasp_version(buf_ptr) == RFC3146_SW_VERSION
 775 #endif
 776             ))
 777                 fwnet_incoming_packet(dev, buf_ptr + 2,
 778                                       length - IEEE1394_GASP_HDR_SIZE,
 779                                       gasp_source_id(buf_ptr),
 780                                       context->card->generation, true);
 781
 782         packet.payload_length = dev->rcv_buffer_size;
 783         packet.interrupt = 1;
 784         packet.skip = 0;
 785         packet.tag = 3;
 786         packet.sy = 0;
 787         packet.header_length = IEEE1394_GASP_HDR_SIZE;
 788
 789         spin_lock_irqsave(&dev->lock, flags);
 790
 791         retval = fw_iso_context_queue(dev->broadcast_rcv_context, &packet,
 792                                       &dev->broadcast_rcv_buffer, offset);
 793
 794         spin_unlock_irqrestore(&dev->lock, flags);
 795
 796         if (retval >= 0)
 797                 fw_iso_context_queue_flush(dev->broadcast_rcv_context);
 798         else
 799                 dev_err(&dev->netdev->dev, "requeue failed\n");
 800 }
 801
 802 static struct kmem_cache *fwnet_packet_task_cache;
 803
 804 static void fwnet_free_ptask(struct fwnet_packet_task *ptask)
 805 {
 806         dev_kfree_skb_any(ptask->skb);
 807         kmem_cache_free(fwnet_packet_task_cache, ptask);
 808 }
 809
 810 /* Caller must hold dev->lock. */
 811 static void dec_queued_datagrams(struct fwnet_device *dev)
 812 {
 813         if (--dev->queued_datagrams == FWNET_MIN_QUEUED_DATAGRAMS)
 814                 netif_wake_queue(dev->netdev);
 815 }
 816
 817 static int fwnet_send_packet(struct fwnet_packet_task *ptask);
 818
 819 static void fwnet_transmit_packet_done(struct fwnet_packet_task *ptask)
 820 {
 821         struct fwnet_device *dev = ptask->dev;
 822         struct sk_buff *skb = ptask->skb;
 823         unsigned long flags;
 824         bool free;
 825
 826         spin_lock_irqsave(&dev->lock, flags);
 827
 828         ptask->outstanding_pkts--;
 829
 830         /* Check whether we or the networking TX soft-IRQ is last user. */
 831         free = (ptask->outstanding_pkts == 0 && ptask->enqueued);
 832         if (free)
 833                 dec_queued_datagrams(dev);
 834
 835         if (ptask->outstanding_pkts == 0) {
 836                 dev->netdev->stats.tx_packets++;
 837                 dev->netdev->stats.tx_bytes += skb->len;
 838         }
 839
 840         spin_unlock_irqrestore(&dev->lock, flags);
 841
 842         if (ptask->outstanding_pkts > 0) {
 843                 u16 dg_size;
 844                 u16 fg_off;
 845                 u16 datagram_label;
 846                 u16 lf;
 847
 848                 /* Update the ptask to point to the next fragment and send it */
 849                 lf = fwnet_get_hdr_lf(&ptask->hdr);
 850                 switch (lf) {
 851                 case RFC2374_HDR_LASTFRAG:
 852                 case RFC2374_HDR_UNFRAG:
 853                 default:
 854                         dev_err(&dev->netdev->dev,
 855                                 "outstanding packet %x lf %x, header %x,%x\n",
 856                                 ptask->outstanding_pkts, lf, ptask->hdr.w0,
 857                                 ptask->hdr.w1);
 858                         BUG();
 859
 860                 case RFC2374_HDR_FIRSTFRAG:
 861                         /* Set frag type here for future interior fragments */
 862                         dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
 863                         fg_off = ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
 864                         datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
 865                         break;
 866
 867                 case RFC2374_HDR_INTFRAG:
 868                         dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
 869                         fg_off = fwnet_get_hdr_fg_off(&ptask->hdr)
 870                                   + ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
 871                         datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
 872                         break;
 873                 }
 874
 875                 if (ptask->dest_node == IEEE1394_ALL_NODES) {
 876                         skb_pull(skb,
 877                                  ptask->max_payload + IEEE1394_GASP_HDR_SIZE);
 878                 } else {
 879                         skb_pull(skb, ptask->max_payload);
 880                 }
 881                 if (ptask->outstanding_pkts > 1) {
 882                         fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_INTFRAG,
 883                                           dg_size, fg_off, datagram_label);
 884                 } else {
 885                         fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_LASTFRAG,
 886                                           dg_size, fg_off, datagram_label);
 887                         ptask->max_payload = skb->len + RFC2374_FRAG_HDR_SIZE;
 888                 }
 889                 fwnet_send_packet(ptask);
 890         }
 891
 892         if (free)
 893                 fwnet_free_ptask(ptask);
 894 }
 895
 896 static void fwnet_transmit_packet_failed(struct fwnet_packet_task *ptask)
 897 {
 898         struct fwnet_device *dev = ptask->dev;
 899         unsigned long flags;
 900         bool free;
 901
 902         spin_lock_irqsave(&dev->lock, flags);
 903
 904         /* One fragment failed; don't try to send remaining fragments. */
 905         ptask->outstanding_pkts = 0;
 906
 907         /* Check whether we or the networking TX soft-IRQ is last user. */
 908         free = ptask->enqueued;
 909         if (free)
 910                 dec_queued_datagrams(dev);
 911
 912         dev->netdev->stats.tx_dropped++;
 913         dev->netdev->stats.tx_errors++;
 914
 915         spin_unlock_irqrestore(&dev->lock, flags);
 916
 917         if (free)
 918                 fwnet_free_ptask(ptask);
 919 }
 920
 921 static void fwnet_write_complete(struct fw_card *card, int rcode,
 922                                  void *payload, size_t length, void *data)
 923 {
 924         struct fwnet_packet_task *ptask = data;
 925         static unsigned long j;
 926         static int last_rcode, errors_skipped;
 927
 928         if (rcode == RCODE_COMPLETE) {
 929                 fwnet_transmit_packet_done(ptask);
 930         } else {
 931                 if (printk_timed_ratelimit(&j,  1000) || rcode != last_rcode) {
 932                         dev_err(&ptask->dev->netdev->dev,
 933                                 "fwnet_write_complete failed: %x (skipped %d)\n",
 934                                 rcode, errors_skipped);
 935
 936                         errors_skipped = 0;
 937                         last_rcode = rcode;
 938                 } else {
 939                         errors_skipped++;
 940                 }
 941                 fwnet_transmit_packet_failed(ptask);
 942         }
 943 }
 944
 945 static int fwnet_send_packet(struct fwnet_packet_task *ptask)
 946 {
 947         struct fwnet_device *dev;
 948         unsigned tx_len;
 949         struct rfc2734_header *bufhdr;
 950         unsigned long flags;
 951         bool free;
 952
 953         dev = ptask->dev;
 954         tx_len = ptask->max_payload;
 955         switch (fwnet_get_hdr_lf(&ptask->hdr)) {
 956         case RFC2374_HDR_UNFRAG:
 957                 bufhdr = skb_push(ptask->skb, RFC2374_UNFRAG_HDR_SIZE);
 958                 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
 959                 break;
 960
 961         case RFC2374_HDR_FIRSTFRAG:
 962         case RFC2374_HDR_INTFRAG:
 963         case RFC2374_HDR_LASTFRAG:
 964                 bufhdr = skb_push(ptask->skb, RFC2374_FRAG_HDR_SIZE);
 965                 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
 966                 put_unaligned_be32(ptask->hdr.w1, &bufhdr->w1);
 967                 break;
 968
 969         default:
 970                 BUG();
 971         }
 972         if (ptask->dest_node == IEEE1394_ALL_NODES) {
 973                 u8 *p;
 974                 int generation;
 975                 int node_id;
 976                 unsigned int sw_version;
 977
 978                 /* ptask->generation may not have been set yet */
 979                 generation = dev->card->generation;
 980                 smp_rmb();
 981                 node_id = dev->card->node_id;
 982
 983                 switch (ptask->skb->protocol) {
 984                 default:
 985                         sw_version = RFC2734_SW_VERSION;
 986                         break;
 987 #if IS_ENABLED(CONFIG_IPV6)
 988                 case htons(ETH_P_IPV6):
 989                         sw_version = RFC3146_SW_VERSION;
 990 #endif
 991                 }
 992
 993                 p = skb_push(ptask->skb, IEEE1394_GASP_HDR_SIZE);
 994                 put_unaligned_be32(node_id << 16 | IANA_SPECIFIER_ID >> 8, p);
 995                 put_unaligned_be32((IANA_SPECIFIER_ID & 0xff) << 24
 996                                                 | sw_version, &p[4]);
 997
 998                 /* We should not transmit if broadcast_channel.valid == 0. */
 999                 fw_send_request(dev->card, &ptask->transaction,
1000                                 TCODE_STREAM_DATA,
1001                                 fw_stream_packet_destination_id(3,
1002                                                 IEEE1394_BROADCAST_CHANNEL, 0),
1003                                 generation, SCODE_100, 0ULL, ptask->skb->data,
1004                                 tx_len + 8, fwnet_write_complete, ptask);
1005
1006                 spin_lock_irqsave(&dev->lock, flags);
1007
1008                 /* If the AT tasklet already ran, we may be last user. */
1009                 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1010                 if (!free)
1011                         ptask->enqueued = true;
1012                 else
1013                         dec_queued_datagrams(dev);
1014
1015                 spin_unlock_irqrestore(&dev->lock, flags);
1016
1017                 goto out;
1018         }
1019
1020         fw_send_request(dev->card, &ptask->transaction,
1021                         TCODE_WRITE_BLOCK_REQUEST, ptask->dest_node,
1022                         ptask->generation, ptask->speed, ptask->fifo_addr,
1023                         ptask->skb->data, tx_len, fwnet_write_complete, ptask);
1024
1025         spin_lock_irqsave(&dev->lock, flags);
1026
1027         /* If the AT tasklet already ran, we may be last user. */
1028         free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1029         if (!free)
1030                 ptask->enqueued = true;
1031         else
1032                 dec_queued_datagrams(dev);
1033
1034         spin_unlock_irqrestore(&dev->lock, flags);
1035
1036         netif_trans_update(dev->netdev);
1037  out:
1038         if (free)
1039                 fwnet_free_ptask(ptask);
1040
1041         return 0;
1042 }
1043
1044 static void fwnet_fifo_stop(struct fwnet_device *dev)
1045 {
1046         if (dev->local_fifo == FWNET_NO_FIFO_ADDR)
1047                 return;
1048
1049         fw_core_remove_address_handler(&dev->handler);
1050         dev->local_fifo = FWNET_NO_FIFO_ADDR;
1051 }
1052
1053 static int fwnet_fifo_start(struct fwnet_device *dev)
1054 {
1055         int retval;
1056
1057         if (dev->local_fifo != FWNET_NO_FIFO_ADDR)
1058                 return 0;
1059
1060         dev->handler.length = 4096;
1061         dev->handler.address_callback = fwnet_receive_packet;
1062         dev->handler.callback_data = dev;
1063
1064         retval = fw_core_add_address_handler(&dev->handler,
1065                                              &fw_high_memory_region);
1066         if (retval < 0)
1067                 return retval;
1068
1069         dev->local_fifo = dev->handler.offset;
1070
1071         return 0;
1072 }
1073
1074 static void __fwnet_broadcast_stop(struct fwnet_device *dev)
1075 {
1076         unsigned u;
1077
1078         if (dev->broadcast_state != FWNET_BROADCAST_ERROR) {
1079                 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++)
1080                         kunmap(dev->broadcast_rcv_buffer.pages[u]);
1081                 fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer, dev->card);
1082         }
1083         if (dev->broadcast_rcv_context) {
1084                 fw_iso_context_destroy(dev->broadcast_rcv_context);
1085                 dev->broadcast_rcv_context = NULL;
1086         }
1087         kfree(dev->broadcast_rcv_buffer_ptrs);
1088         dev->broadcast_rcv_buffer_ptrs = NULL;
1089         dev->broadcast_state = FWNET_BROADCAST_ERROR;
1090 }
1091
1092 static void fwnet_broadcast_stop(struct fwnet_device *dev)
1093 {
1094         if (dev->broadcast_state == FWNET_BROADCAST_ERROR)
1095                 return;
1096         fw_iso_context_stop(dev->broadcast_rcv_context);
1097         __fwnet_broadcast_stop(dev);
1098 }
1099
1100 static int fwnet_broadcast_start(struct fwnet_device *dev)
1101 {
1102         struct fw_iso_context *context;
1103         int retval;
1104         unsigned num_packets;
1105         unsigned max_receive;
1106         struct fw_iso_packet packet;
1107         unsigned long offset;
1108         void **ptrptr;
1109         unsigned u;
1110
1111         if (dev->broadcast_state != FWNET_BROADCAST_ERROR)
1112                 return 0;
1113
1114         max_receive = 1U << (dev->card->max_receive + 1);
1115         num_packets = (FWNET_ISO_PAGE_COUNT * PAGE_SIZE) / max_receive;
1116
1117         ptrptr = kmalloc_array(num_packets, sizeof(void *), GFP_KERNEL);
1118         if (!ptrptr) {
1119                 retval = -ENOMEM;
1120                 goto failed;
1121         }
1122         dev->broadcast_rcv_buffer_ptrs = ptrptr;
1123
1124         context = fw_iso_context_create(dev->card, FW_ISO_CONTEXT_RECEIVE,
1125                                         IEEE1394_BROADCAST_CHANNEL,
1126                                         dev->card->link_speed, 8,
1127                                         fwnet_receive_broadcast, dev);
1128         if (IS_ERR(context)) {
1129                 retval = PTR_ERR(context);
1130                 goto failed;
1131         }
1132
1133         retval = fw_iso_buffer_init(&dev->broadcast_rcv_buffer, dev->card,
1134                                     FWNET_ISO_PAGE_COUNT, DMA_FROM_DEVICE);
1135         if (retval < 0)
1136                 goto failed;
1137
1138         dev->broadcast_state = FWNET_BROADCAST_STOPPED;
1139
1140         for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++) {
1141                 void *ptr;
1142                 unsigned v;
1143
1144                 ptr = kmap(dev->broadcast_rcv_buffer.pages[u]);
1145                 for (v = 0; v < num_packets / FWNET_ISO_PAGE_COUNT; v++)
1146                         *ptrptr++ = (void *) ((char *)ptr + v * max_receive);
1147         }
1148         dev->broadcast_rcv_context = context;
1149
1150         packet.payload_length = max_receive;
1151         packet.interrupt = 1;
1152         packet.skip = 0;
1153         packet.tag = 3;
1154         packet.sy = 0;
1155         packet.header_length = IEEE1394_GASP_HDR_SIZE;
1156         offset = 0;
1157
1158         for (u = 0; u < num_packets; u++) {
1159                 retval = fw_iso_context_queue(context, &packet,
1160                                 &dev->broadcast_rcv_buffer, offset);
1161                 if (retval < 0)
1162                         goto failed;
1163
1164                 offset += max_receive;
1165         }
1166         dev->num_broadcast_rcv_ptrs = num_packets;
1167         dev->rcv_buffer_size = max_receive;
1168         dev->broadcast_rcv_next_ptr = 0U;
1169         retval = fw_iso_context_start(context, -1, 0,
1170                         FW_ISO_CONTEXT_MATCH_ALL_TAGS); /* ??? sync */
1171         if (retval < 0)
1172                 goto failed;
1173
1174         /* FIXME: adjust it according to the min. speed of all known peers? */
1175         dev->broadcast_xmt_max_payload = IEEE1394_MAX_PAYLOAD_S100
1176                         - IEEE1394_GASP_HDR_SIZE - RFC2374_UNFRAG_HDR_SIZE;
1177         dev->broadcast_state = FWNET_BROADCAST_RUNNING;
1178
1179         return 0;
1180
1181  failed:
1182         __fwnet_broadcast_stop(dev);
1183         return retval;
1184 }
1185
1186 static void set_carrier_state(struct fwnet_device *dev)
1187 {
1188         if (dev->peer_count > 1)
1189                 netif_carrier_on(dev->netdev);
1190         else
1191                 netif_carrier_off(dev->netdev);
1192 }
1193
1194 /* ifup */
1195 static int fwnet_open(struct net_device *net)
1196 {
1197         struct fwnet_device *dev = netdev_priv(net);
1198         int ret;
1199
1200         ret = fwnet_broadcast_start(dev);
1201         if (ret)
1202                 return ret;
1203
1204         netif_start_queue(net);
1205
1206         spin_lock_irq(&dev->lock);
1207         set_carrier_state(dev);
1208         spin_unlock_irq(&dev->lock);
1209
1210         return 0;
1211 }
1212
1213 /* ifdown */
1214 static int fwnet_stop(struct net_device *net)
1215 {
1216         struct fwnet_device *dev = netdev_priv(net);
1217
1218         netif_stop_queue(net);
1219         fwnet_broadcast_stop(dev);
1220
1221         return 0;
1222 }
1223
1224 static netdev_tx_t fwnet_tx(struct sk_buff *skb, struct net_device *net)
1225 {
1226         struct fwnet_header hdr_buf;
1227         struct fwnet_device *dev = netdev_priv(net);
1228         __be16 proto;
1229         u16 dest_node;
1230         unsigned max_payload;
1231         u16 dg_size;
1232         u16 *datagram_label_ptr;
1233         struct fwnet_packet_task *ptask;
1234         struct fwnet_peer *peer;
1235         unsigned long flags;
1236
1237         spin_lock_irqsave(&dev->lock, flags);
1238
1239         /* Can this happen? */
1240         if (netif_queue_stopped(dev->netdev)) {
1241                 spin_unlock_irqrestore(&dev->lock, flags);
1242
1243                 return NETDEV_TX_BUSY;
1244         }
1245
1246         ptask = kmem_cache_alloc(fwnet_packet_task_cache, GFP_ATOMIC);
1247         if (ptask == NULL)
1248                 goto fail;
1249
1250         skb = skb_share_check(skb, GFP_ATOMIC);
1251         if (!skb)
1252                 goto fail;
1253
1254         /*
1255          * Make a copy of the driver-specific header.
1256          * We might need to rebuild the header on tx failure.
1257          */
1258         memcpy(&hdr_buf, skb->data, sizeof(hdr_buf));
1259         proto = hdr_buf.h_proto;
1260
1261         switch (proto) {
1262         case htons(ETH_P_ARP):
1263         case htons(ETH_P_IP):
1264 #if IS_ENABLED(CONFIG_IPV6)
1265         case htons(ETH_P_IPV6):
1266 #endif
1267                 break;
1268         default:
1269                 goto fail;
1270         }
1271
1272         skb_pull(skb, sizeof(hdr_buf));
1273         dg_size = skb->len;
1274
1275         /*
1276          * Set the transmission type for the packet.  ARP packets and IP
1277          * broadcast packets are sent via GASP.
1278          */
1279         if (fwnet_hwaddr_is_multicast(hdr_buf.h_dest)) {
1280                 max_payload        = dev->broadcast_xmt_max_payload;
1281                 datagram_label_ptr = &dev->broadcast_xmt_datagramlabel;
1282
1283                 ptask->fifo_addr   = FWNET_NO_FIFO_ADDR;
1284                 ptask->generation  = 0;
1285                 ptask->dest_node   = IEEE1394_ALL_NODES;
1286                 ptask->speed       = SCODE_100;
1287         } else {
1288                 union fwnet_hwaddr *ha = (union fwnet_hwaddr *)hdr_buf.h_dest;
1289                 __be64 guid = get_unaligned(&ha->uc.uniq_id);
1290                 u8 generation;
1291
1292                 peer = fwnet_peer_find_by_guid(dev, be64_to_cpu(guid));
1293                 if (!peer)
1294                         goto fail;
1295
1296                 generation         = peer->generation;
1297                 dest_node          = peer->node_id;
1298                 max_payload        = peer->max_payload;
1299                 datagram_label_ptr = &peer->datagram_label;
1300
1301                 ptask->fifo_addr   = get_unaligned_be48(ha->uc.fifo);
1302                 ptask->generation  = generation;
1303                 ptask->dest_node   = dest_node;
1304                 ptask->speed       = peer->speed;
1305         }
1306
1307         ptask->hdr.w0 = 0;
1308         ptask->hdr.w1 = 0;
1309         ptask->skb = skb;
1310         ptask->dev = dev;
1311
1312         /* Does it all fit in one packet? */
1313         if (dg_size <= max_payload) {
1314                 fwnet_make_uf_hdr(&ptask->hdr, ntohs(proto));
1315                 ptask->outstanding_pkts = 1;
1316                 max_payload = dg_size + RFC2374_UNFRAG_HDR_SIZE;
1317         } else {
1318                 u16 datagram_label;
1319
1320                 max_payload -= RFC2374_FRAG_OVERHEAD;
1321                 datagram_label = (*datagram_label_ptr)++;
1322                 fwnet_make_ff_hdr(&ptask->hdr, ntohs(proto), dg_size,
1323                                   datagram_label);
1324                 ptask->outstanding_pkts = DIV_ROUND_UP(dg_size, max_payload);
1325                 max_payload += RFC2374_FRAG_HDR_SIZE;
1326         }
1327
1328         if (++dev->queued_datagrams == FWNET_MAX_QUEUED_DATAGRAMS)
1329                 netif_stop_queue(dev->netdev);
1330
1331         spin_unlock_irqrestore(&dev->lock, flags);
1332
1333         ptask->max_payload = max_payload;
1334         ptask->enqueued    = 0;
1335
1336         fwnet_send_packet(ptask);
1337
1338         return NETDEV_TX_OK;
1339
1340  fail:
1341         spin_unlock_irqrestore(&dev->lock, flags);
1342
1343         if (ptask)
1344                 kmem_cache_free(fwnet_packet_task_cache, ptask);
1345
1346         if (skb != NULL)
1347                 dev_kfree_skb(skb);
1348
1349         net->stats.tx_dropped++;
1350         net->stats.tx_errors++;
1351
1352         /*
1353          * FIXME: According to a patch from 2003-02-26, "returning non-zero
1354          * causes serious problems" here, allegedly.  Before that patch,
1355          * -ERRNO was returned which is not appropriate under Linux 2.6.
1356          * Perhaps more needs to be done?  Stop the queue in serious
1357          * conditions and restart it elsewhere?
1358          */
1359         return NETDEV_TX_OK;
1360 }
1361
1362 static const struct ethtool_ops fwnet_ethtool_ops = {
1363         .get_link       = ethtool_op_get_link,
1364 };
1365
1366 static const struct net_device_ops fwnet_netdev_ops = {
1367         .ndo_open       = fwnet_open,
1368         .ndo_stop       = fwnet_stop,
1369         .ndo_start_xmit = fwnet_tx,
1370 };
1371
1372 static void fwnet_init_dev(struct net_device *net)
1373 {
1374         net->header_ops         = &fwnet_header_ops;
1375         net->netdev_ops         = &fwnet_netdev_ops;
1376         net->watchdog_timeo     = 2 * HZ;
1377         net->flags              = IFF_BROADCAST | IFF_MULTICAST;
1378         net->features           = NETIF_F_HIGHDMA;
1379         net->addr_len           = FWNET_ALEN;
1380         net->hard_header_len    = FWNET_HLEN;
1381         net->type               = ARPHRD_IEEE1394;
1382         net->tx_queue_len       = FWNET_TX_QUEUE_LEN;
1383         net->ethtool_ops        = &fwnet_ethtool_ops;
1384 }
1385
1386 /* caller must hold fwnet_device_mutex */
1387 static struct fwnet_device *fwnet_dev_find(struct fw_card *card)
1388 {
1389         struct fwnet_device *dev;
1390
1391         list_for_each_entry(dev, &fwnet_device_list, dev_link)
1392                 if (dev->card == card)
1393                         return dev;
1394
1395         return NULL;
1396 }
1397
1398 static int fwnet_add_peer(struct fwnet_device *dev,
1399                           struct fw_unit *unit, struct fw_device *device)
1400 {
1401         struct fwnet_peer *peer;
1402
1403         peer = kmalloc(sizeof(*peer), GFP_KERNEL);
1404         if (!peer)
1405                 return -ENOMEM;
1406
1407         dev_set_drvdata(&unit->device, peer);
1408
1409         peer->dev = dev;
1410         peer->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4];
1411         INIT_LIST_HEAD(&peer->pd_list);
1412         peer->pdg_size = 0;
1413         peer->datagram_label = 0;
1414         peer->speed = device->max_speed;
1415         peer->max_payload = fwnet_max_payload(device->max_rec, peer->speed);
1416
1417         peer->generation = device->generation;
1418         smp_rmb();
1419         peer->node_id = device->node_id;
1420
1421         spin_lock_irq(&dev->lock);
1422         list_add_tail(&peer->peer_link, &dev->peer_list);
1423         dev->peer_count++;
1424         set_carrier_state(dev);
1425         spin_unlock_irq(&dev->lock);
1426
1427         return 0;
1428 }
1429
1430 static int fwnet_probe(struct fw_unit *unit,
1431                        const struct ieee1394_device_id *id)
1432 {
1433         struct fw_device *device = fw_parent_device(unit);
1434         struct fw_card *card = device->card;
1435         struct net_device *net;
1436         bool allocated_netdev = false;
1437         struct fwnet_device *dev;
1438         union fwnet_hwaddr ha;
1439         int ret;
1440
1441         mutex_lock(&fwnet_device_mutex);
1442
1443         dev = fwnet_dev_find(card);
1444         if (dev) {
1445                 net = dev->netdev;
1446                 goto have_dev;
1447         }
1448
1449         net = alloc_netdev(sizeof(*dev), "firewire%d", NET_NAME_UNKNOWN,
1450                            fwnet_init_dev);
1451         if (net == NULL) {
1452                 mutex_unlock(&fwnet_device_mutex);
1453                 return -ENOMEM;
1454         }
1455
1456         allocated_netdev = true;
1457         SET_NETDEV_DEV(net, card->device);
1458         dev = netdev_priv(net);
1459
1460         spin_lock_init(&dev->lock);
1461         dev->broadcast_state = FWNET_BROADCAST_ERROR;
1462         dev->broadcast_rcv_context = NULL;
1463         dev->broadcast_xmt_max_payload = 0;
1464         dev->broadcast_xmt_datagramlabel = 0;
1465         dev->local_fifo = FWNET_NO_FIFO_ADDR;
1466         dev->queued_datagrams = 0;
1467         INIT_LIST_HEAD(&dev->peer_list);
1468         dev->card = card;
1469         dev->netdev = net;
1470
1471         ret = fwnet_fifo_start(dev);
1472         if (ret < 0)
1473                 goto out;
1474         dev->local_fifo = dev->handler.offset;
1475
1476         /*
1477          * default MTU: RFC 2734 cl. 4, RFC 3146 cl. 4
1478          * maximum MTU: RFC 2734 cl. 4.2, fragment encapsulation header's
1479          *              maximum possible datagram_size + 1 = 0xfff + 1
1480          */
1481         net->mtu = 1500U;
1482         net->min_mtu = ETH_MIN_MTU;
1483         net->max_mtu = 4096U;
1484
1485         /* Set our hardware address while we're at it */
1486         ha.uc.uniq_id = cpu_to_be64(card->guid);
1487         ha.uc.max_rec = dev->card->max_receive;
1488         ha.uc.sspd = dev->card->link_speed;
1489         put_unaligned_be48(dev->local_fifo, ha.uc.fifo);
1490         dev_addr_set(net, ha.u);
1491
1492         memset(net->broadcast, -1, net->addr_len);
1493
1494         ret = register_netdev(net);
1495         if (ret)
1496                 goto out;
1497
1498         list_add_tail(&dev->dev_link, &fwnet_device_list);
1499         dev_notice(&net->dev, "IP over IEEE 1394 on card %s\n",
1500                    dev_name(card->device));
1501  have_dev:
1502         ret = fwnet_add_peer(dev, unit, device);
1503         if (ret && allocated_netdev) {
1504                 unregister_netdev(net);
1505                 list_del(&dev->dev_link);
1506  out:
1507                 fwnet_fifo_stop(dev);
1508                 free_netdev(net);
1509         }
1510
1511         mutex_unlock(&fwnet_device_mutex);
1512
1513         return ret;
1514 }
1515
1516 /*
1517  * FIXME abort partially sent fragmented datagrams,
1518  * discard partially received fragmented datagrams
1519  */
1520 static void fwnet_update(struct fw_unit *unit)
1521 {
1522         struct fw_device *device = fw_parent_device(unit);
1523         struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1524         int generation;
1525
1526         generation = device->generation;
1527
1528         spin_lock_irq(&peer->dev->lock);
1529         peer->node_id    = device->node_id;
1530         peer->generation = generation;
1531         spin_unlock_irq(&peer->dev->lock);
1532 }
1533
1534 static void fwnet_remove_peer(struct fwnet_peer *peer, struct fwnet_device *dev)
1535 {
1536         struct fwnet_partial_datagram *pd, *pd_next;
1537
1538         spin_lock_irq(&dev->lock);
1539         list_del(&peer->peer_link);
1540         dev->peer_count--;
1541         set_carrier_state(dev);
1542         spin_unlock_irq(&dev->lock);
1543
1544         list_for_each_entry_safe(pd, pd_next, &peer->pd_list, pd_link)
1545                 fwnet_pd_delete(pd);
1546
1547         kfree(peer);
1548 }
1549
1550 static void fwnet_remove(struct fw_unit *unit)
1551 {
1552         struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1553         struct fwnet_device *dev = peer->dev;
1554         struct net_device *net;
1555         int i;
1556
1557         mutex_lock(&fwnet_device_mutex);
1558
1559         net = dev->netdev;
1560
1561         fwnet_remove_peer(peer, dev);
1562
1563         if (list_empty(&dev->peer_list)) {
1564                 unregister_netdev(net);
1565
1566                 fwnet_fifo_stop(dev);
1567
1568                 for (i = 0; dev->queued_datagrams && i < 5; i++)
1569                         ssleep(1);
1570                 WARN_ON(dev->queued_datagrams);
1571                 list_del(&dev->dev_link);
1572
1573                 free_netdev(net);
1574         }
1575
1576         mutex_unlock(&fwnet_device_mutex);
1577 }
1578
1579 static const struct ieee1394_device_id fwnet_id_table[] = {
1580         {
1581                 .match_flags  = IEEE1394_MATCH_SPECIFIER_ID |
1582                                 IEEE1394_MATCH_VERSION,
1583                 .specifier_id = IANA_SPECIFIER_ID,
1584                 .version      = RFC2734_SW_VERSION,
1585         },
1586 #if IS_ENABLED(CONFIG_IPV6)
1587         {
1588                 .match_flags  = IEEE1394_MATCH_SPECIFIER_ID |
1589                                 IEEE1394_MATCH_VERSION,
1590                 .specifier_id = IANA_SPECIFIER_ID,
1591                 .version      = RFC3146_SW_VERSION,
1592         },
1593 #endif
1594         { }
1595 };
1596
1597 static struct fw_driver fwnet_driver = {
1598         .driver = {
1599                 .owner  = THIS_MODULE,
1600                 .name   = KBUILD_MODNAME,
1601                 .bus    = &fw_bus_type,
1602         },
1603         .probe    = fwnet_probe,
1604         .update   = fwnet_update,
1605         .remove   = fwnet_remove,
1606         .id_table = fwnet_id_table,
1607 };
1608
1609 static const u32 rfc2374_unit_directory_data[] = {
1610         0x00040000,     /* directory_length             */
1611         0x1200005e,     /* unit_specifier_id: IANA      */
1612         0x81000003,     /* textual descriptor offset    */
1613         0x13000001,     /* unit_sw_version: RFC 2734    */
1614         0x81000005,     /* textual descriptor offset    */
1615         0x00030000,     /* descriptor_length            */
1616         0x00000000,     /* text                         */
1617         0x00000000,     /* minimal ASCII, en            */
1618         0x49414e41,     /* I A N A                      */
1619         0x00030000,     /* descriptor_length            */
1620         0x00000000,     /* text                         */
1621         0x00000000,     /* minimal ASCII, en            */
1622         0x49507634,     /* I P v 4                      */
1623 };
1624
1625 static struct fw_descriptor rfc2374_unit_directory = {
1626         .length = ARRAY_SIZE(rfc2374_unit_directory_data),
1627         .key    = (CSR_DIRECTORY | CSR_UNIT) << 24,
1628         .data   = rfc2374_unit_directory_data
1629 };
1630
1631 #if IS_ENABLED(CONFIG_IPV6)
1632 static const u32 rfc3146_unit_directory_data[] = {
1633         0x00040000,     /* directory_length             */
1634         0x1200005e,     /* unit_specifier_id: IANA      */
1635         0x81000003,     /* textual descriptor offset    */
1636         0x13000002,     /* unit_sw_version: RFC 3146    */
1637         0x81000005,     /* textual descriptor offset    */
1638         0x00030000,     /* descriptor_length            */
1639         0x00000000,     /* text                         */
1640         0x00000000,     /* minimal ASCII, en            */
1641         0x49414e41,     /* I A N A                      */
1642         0x00030000,     /* descriptor_length            */
1643         0x00000000,     /* text                         */
1644         0x00000000,     /* minimal ASCII, en            */
1645         0x49507636,     /* I P v 6                      */
1646 };
1647
1648 static struct fw_descriptor rfc3146_unit_directory = {
1649         .length = ARRAY_SIZE(rfc3146_unit_directory_data),
1650         .key    = (CSR_DIRECTORY | CSR_UNIT) << 24,
1651         .data   = rfc3146_unit_directory_data
1652 };
1653 #endif
1654
1655 static int __init fwnet_init(void)
1656 {
1657         int err;
1658
1659         err = fw_core_add_descriptor(&rfc2374_unit_directory);
1660         if (err)
1661                 return err;
1662
1663 #if IS_ENABLED(CONFIG_IPV6)
1664         err = fw_core_add_descriptor(&rfc3146_unit_directory);
1665         if (err)
1666                 goto out;
1667 #endif
1668
1669         fwnet_packet_task_cache = kmem_cache_create("packet_task",
1670                         sizeof(struct fwnet_packet_task), 0, 0, NULL);
1671         if (!fwnet_packet_task_cache) {
1672                 err = -ENOMEM;
1673                 goto out2;
1674         }
1675
1676         err = driver_register(&fwnet_driver.driver);
1677         if (!err)
1678                 return 0;
1679
1680         kmem_cache_destroy(fwnet_packet_task_cache);
1681 out2:
1682 #if IS_ENABLED(CONFIG_IPV6)
1683         fw_core_remove_descriptor(&rfc3146_unit_directory);
1684 out:
1685 #endif
1686         fw_core_remove_descriptor(&rfc2374_unit_directory);
1687
1688         return err;
1689 }
1690 module_init(fwnet_init);
1691
1692 static void __exit fwnet_cleanup(void)
1693 {
1694         driver_unregister(&fwnet_driver.driver);
1695         kmem_cache_destroy(fwnet_packet_task_cache);
1696 #if IS_ENABLED(CONFIG_IPV6)
1697         fw_core_remove_descriptor(&rfc3146_unit_directory);
1698 #endif
1699         fw_core_remove_descriptor(&rfc2374_unit_directory);
1700 }
1701 module_exit(fwnet_cleanup);
1702
1703 MODULE_AUTHOR("Jay Fenlason <fenlason@redhat.com>");
1704 MODULE_DESCRIPTION("IP over IEEE1394 as per RFC 2734/3146");
1705 MODULE_LICENSE("GPL");
1706 MODULE_DEVICE_TABLE(ieee1394, fwnet_id_table);