drivers/firewire/net.c

   1 /*
   2  * IPv4 over IEEE 1394, per RFC 2734
   3  * IPv6 over IEEE 1394, per RFC 3146
   4  *
   5  * Copyright (C) 2009 Jay Fenlason <fenlason@redhat.com>
   6  *
   7  * based on eth1394 by Ben Collins et al
   8  */
   9
  10 #include <linux/bug.h>
  11 #include <linux/compiler.h>
  12 #include <linux/delay.h>
  13 #include <linux/device.h>
  14 #include <linux/ethtool.h>
  15 #include <linux/firewire.h>
  16 #include <linux/firewire-constants.h>
  17 #include <linux/highmem.h>
  18 #include <linux/in.h>
  19 #include <linux/ip.h>
  20 #include <linux/jiffies.h>
  21 #include <linux/mod_devicetable.h>
  22 #include <linux/module.h>
  23 #include <linux/moduleparam.h>
  24 #include <linux/mutex.h>
  25 #include <linux/netdevice.h>
  26 #include <linux/skbuff.h>
  27 #include <linux/slab.h>
  28 #include <linux/spinlock.h>
  29
  30 #include <asm/unaligned.h>
  31 #include <net/arp.h>
  32 #include <net/firewire.h>
  33
  34 /* rx limits */
  35 #define FWNET_MAX_FRAGMENTS             30 /* arbitrary, > TX queue depth */
  36 #define FWNET_ISO_PAGE_COUNT            (PAGE_SIZE < 16*1024 ? 4 : 2)
  37
  38 /* tx limits */
  39 #define FWNET_MAX_QUEUED_DATAGRAMS      20 /* < 64 = number of tlabels */
  40 #define FWNET_MIN_QUEUED_DATAGRAMS      10 /* should keep AT DMA busy enough */
  41 #define FWNET_TX_QUEUE_LEN              FWNET_MAX_QUEUED_DATAGRAMS /* ? */
  42
  43 #define IEEE1394_BROADCAST_CHANNEL      31
  44 #define IEEE1394_ALL_NODES              (0xffc0 | 0x003f)
  45 #define IEEE1394_MAX_PAYLOAD_S100       512
  46 #define FWNET_NO_FIFO_ADDR              (~0ULL)
  47
  48 #define IANA_SPECIFIER_ID               0x00005eU
  49 #define RFC2734_SW_VERSION              0x000001U
  50 #define RFC3146_SW_VERSION              0x000002U
  51
  52 #define IEEE1394_GASP_HDR_SIZE  8
  53
  54 #define RFC2374_UNFRAG_HDR_SIZE 4
  55 #define RFC2374_FRAG_HDR_SIZE   8
  56 #define RFC2374_FRAG_OVERHEAD   4
  57
  58 #define RFC2374_HDR_UNFRAG      0       /* unfragmented         */
  59 #define RFC2374_HDR_FIRSTFRAG   1       /* first fragment       */
  60 #define RFC2374_HDR_LASTFRAG    2       /* last fragment        */
  61 #define RFC2374_HDR_INTFRAG     3       /* interior fragment    */
  62
  63 static bool fwnet_hwaddr_is_multicast(u8 *ha)
  64 {
  65         return !!(*ha & 1);
  66 }
  67
  68 /* IPv4 and IPv6 encapsulation header */
  69 struct rfc2734_header {
  70         u32 w0;
  71         u32 w1;
  72 };
  73
  74 #define fwnet_get_hdr_lf(h)             (((h)->w0 & 0xc0000000) >> 30)
  75 #define fwnet_get_hdr_ether_type(h)     (((h)->w0 & 0x0000ffff))
  76 #define fwnet_get_hdr_dg_size(h)        ((((h)->w0 & 0x0fff0000) >> 16) + 1)
  77 #define fwnet_get_hdr_fg_off(h)         (((h)->w0 & 0x00000fff))
  78 #define fwnet_get_hdr_dgl(h)            (((h)->w1 & 0xffff0000) >> 16)
  79
  80 #define fwnet_set_hdr_lf(lf)            ((lf) << 30)
  81 #define fwnet_set_hdr_ether_type(et)    (et)
  82 #define fwnet_set_hdr_dg_size(dgs)      (((dgs) - 1) << 16)
  83 #define fwnet_set_hdr_fg_off(fgo)       (fgo)
  84
  85 #define fwnet_set_hdr_dgl(dgl)          ((dgl) << 16)
  86
  87 static inline void fwnet_make_uf_hdr(struct rfc2734_header *hdr,
  88                 unsigned ether_type)
  89 {
  90         hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_UNFRAG)
  91                   | fwnet_set_hdr_ether_type(ether_type);
  92 }
  93
  94 static inline void fwnet_make_ff_hdr(struct rfc2734_header *hdr,
  95                 unsigned ether_type, unsigned dg_size, unsigned dgl)
  96 {
  97         hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_FIRSTFRAG)
  98                   | fwnet_set_hdr_dg_size(dg_size)
  99                   | fwnet_set_hdr_ether_type(ether_type);
 100         hdr->w1 = fwnet_set_hdr_dgl(dgl);
 101 }
 102
 103 static inline void fwnet_make_sf_hdr(struct rfc2734_header *hdr,
 104                 unsigned lf, unsigned dg_size, unsigned fg_off, unsigned dgl)
 105 {
 106         hdr->w0 = fwnet_set_hdr_lf(lf)
 107                   | fwnet_set_hdr_dg_size(dg_size)
 108                   | fwnet_set_hdr_fg_off(fg_off);
 109         hdr->w1 = fwnet_set_hdr_dgl(dgl);
 110 }
 111
 112 /* This list keeps track of what parts of the datagram have been filled in */
 113 struct fwnet_fragment_info {
 114         struct list_head fi_link;
 115         u16 offset;
 116         u16 len;
 117 };
 118
 119 struct fwnet_partial_datagram {
 120         struct list_head pd_link;
 121         struct list_head fi_list;
 122         struct sk_buff *skb;
 123         /* FIXME Why not use skb->data? */
 124         char *pbuf;
 125         u16 datagram_label;
 126         u16 ether_type;
 127         u16 datagram_size;
 128 };
 129
 130 static DEFINE_MUTEX(fwnet_device_mutex);
 131 static LIST_HEAD(fwnet_device_list);
 132
 133 struct fwnet_device {
 134         struct list_head dev_link;
 135         spinlock_t lock;
 136         enum {
 137                 FWNET_BROADCAST_ERROR,
 138                 FWNET_BROADCAST_RUNNING,
 139                 FWNET_BROADCAST_STOPPED,
 140         } broadcast_state;
 141         struct fw_iso_context *broadcast_rcv_context;
 142         struct fw_iso_buffer broadcast_rcv_buffer;
 143         void **broadcast_rcv_buffer_ptrs;
 144         unsigned broadcast_rcv_next_ptr;
 145         unsigned num_broadcast_rcv_ptrs;
 146         unsigned rcv_buffer_size;
 147         /*
 148          * This value is the maximum unfragmented datagram size that can be
 149          * sent by the hardware.  It already has the GASP overhead and the
 150          * unfragmented datagram header overhead calculated into it.
 151          */
 152         unsigned broadcast_xmt_max_payload;
 153         u16 broadcast_xmt_datagramlabel;
 154
 155         /*
 156          * The CSR address that remote nodes must send datagrams to for us to
 157          * receive them.
 158          */
 159         struct fw_address_handler handler;
 160         u64 local_fifo;
 161
 162         /* Number of tx datagrams that have been queued but not yet acked */
 163         int queued_datagrams;
 164
 165         int peer_count;
 166         struct list_head peer_list;
 167         struct fw_card *card;
 168         struct net_device *netdev;
 169 };
 170
 171 struct fwnet_peer {
 172         struct list_head peer_link;
 173         struct fwnet_device *dev;
 174         u64 guid;
 175
 176         /* guarded by dev->lock */
 177         struct list_head pd_list; /* received partial datagrams */
 178         unsigned pdg_size;        /* pd_list size */
 179
 180         u16 datagram_label;       /* outgoing datagram label */
 181         u16 max_payload;          /* includes RFC2374_FRAG_HDR_SIZE overhead */
 182         int node_id;
 183         int generation;
 184         unsigned speed;
 185 };
 186
 187 /* This is our task struct. It's used for the packet complete callback.  */
 188 struct fwnet_packet_task {
 189         struct fw_transaction transaction;
 190         struct rfc2734_header hdr;
 191         struct sk_buff *skb;
 192         struct fwnet_device *dev;
 193
 194         int outstanding_pkts;
 195         u64 fifo_addr;
 196         u16 dest_node;
 197         u16 max_payload;
 198         u8 generation;
 199         u8 speed;
 200         u8 enqueued;
 201 };
 202
 203 /*
 204  * Get fifo address embedded in hwaddr
 205  */
 206 static __u64 fwnet_hwaddr_fifo(union fwnet_hwaddr *ha)
 207 {
 208         return (u64)get_unaligned_be16(&ha->uc.fifo_hi) << 32
 209                | get_unaligned_be32(&ha->uc.fifo_lo);
 210 }
 211
 212 /*
 213  * saddr == NULL means use device source address.
 214  * daddr == NULL means leave destination address (eg unresolved arp).
 215  */
 216 static int fwnet_header_create(struct sk_buff *skb, struct net_device *net,
 217                         unsigned short type, const void *daddr,
 218                         const void *saddr, unsigned len)
 219 {
 220         struct fwnet_header *h;
 221
 222         h = (struct fwnet_header *)skb_push(skb, sizeof(*h));
 223         put_unaligned_be16(type, &h->h_proto);
 224
 225         if (net->flags & (IFF_LOOPBACK | IFF_NOARP)) {
 226                 memset(h->h_dest, 0, net->addr_len);
 227
 228                 return net->hard_header_len;
 229         }
 230
 231         if (daddr) {
 232                 memcpy(h->h_dest, daddr, net->addr_len);
 233
 234                 return net->hard_header_len;
 235         }
 236
 237         return -net->hard_header_len;
 238 }
 239
 240 static int fwnet_header_cache(const struct neighbour *neigh,
 241                               struct hh_cache *hh, __be16 type)
 242 {
 243         struct net_device *net;
 244         struct fwnet_header *h;
 245
 246         if (type == cpu_to_be16(ETH_P_802_3))
 247                 return -1;
 248         net = neigh->dev;
 249         h = (struct fwnet_header *)((u8 *)hh->hh_data + HH_DATA_OFF(sizeof(*h)));
 250         h->h_proto = type;
 251         memcpy(h->h_dest, neigh->ha, net->addr_len);
 252         hh->hh_len = FWNET_HLEN;
 253
 254         return 0;
 255 }
 256
 257 /* Called by Address Resolution module to notify changes in address. */
 258 static void fwnet_header_cache_update(struct hh_cache *hh,
 259                 const struct net_device *net, const unsigned char *haddr)
 260 {
 261         memcpy((u8 *)hh->hh_data + HH_DATA_OFF(FWNET_HLEN), haddr, net->addr_len);
 262 }
 263
 264 static int fwnet_header_parse(const struct sk_buff *skb, unsigned char *haddr)
 265 {
 266         memcpy(haddr, skb->dev->dev_addr, FWNET_ALEN);
 267
 268         return FWNET_ALEN;
 269 }
 270
 271 static const struct header_ops fwnet_header_ops = {
 272         .create         = fwnet_header_create,
 273         .cache          = fwnet_header_cache,
 274         .cache_update   = fwnet_header_cache_update,
 275         .parse          = fwnet_header_parse,
 276 };
 277
 278 /* FIXME: is this correct for all cases? */
 279 static bool fwnet_frag_overlap(struct fwnet_partial_datagram *pd,
 280                                unsigned offset, unsigned len)
 281 {
 282         struct fwnet_fragment_info *fi;
 283         unsigned end = offset + len;
 284
 285         list_for_each_entry(fi, &pd->fi_list, fi_link)
 286                 if (offset < fi->offset + fi->len && end > fi->offset)
 287                         return true;
 288
 289         return false;
 290 }
 291
 292 /* Assumes that new fragment does not overlap any existing fragments */
 293 static struct fwnet_fragment_info *fwnet_frag_new(
 294         struct fwnet_partial_datagram *pd, unsigned offset, unsigned len)
 295 {
 296         struct fwnet_fragment_info *fi, *fi2, *new;
 297         struct list_head *list;
 298
 299         list = &pd->fi_list;
 300         list_for_each_entry(fi, &pd->fi_list, fi_link) {
 301                 if (fi->offset + fi->len == offset) {
 302                         /* The new fragment can be tacked on to the end */
 303                         /* Did the new fragment plug a hole? */
 304                         fi2 = list_entry(fi->fi_link.next,
 305                                          struct fwnet_fragment_info, fi_link);
 306                         if (fi->offset + fi->len == fi2->offset) {
 307                                 /* glue fragments together */
 308                                 fi->len += len + fi2->len;
 309                                 list_del(&fi2->fi_link);
 310                                 kfree(fi2);
 311                         } else {
 312                                 fi->len += len;
 313                         }
 314
 315                         return fi;
 316                 }
 317                 if (offset + len == fi->offset) {
 318                         /* The new fragment can be tacked on to the beginning */
 319                         /* Did the new fragment plug a hole? */
 320                         fi2 = list_entry(fi->fi_link.prev,
 321                                          struct fwnet_fragment_info, fi_link);
 322                         if (fi2->offset + fi2->len == fi->offset) {
 323                                 /* glue fragments together */
 324                                 fi2->len += fi->len + len;
 325                                 list_del(&fi->fi_link);
 326                                 kfree(fi);
 327
 328                                 return fi2;
 329                         }
 330                         fi->offset = offset;
 331                         fi->len += len;
 332
 333                         return fi;
 334                 }
 335                 if (offset > fi->offset + fi->len) {
 336                         list = &fi->fi_link;
 337                         break;
 338                 }
 339                 if (offset + len < fi->offset) {
 340                         list = fi->fi_link.prev;
 341                         break;
 342                 }
 343         }
 344
 345         new = kmalloc(sizeof(*new), GFP_ATOMIC);
 346         if (!new)
 347                 return NULL;
 348
 349         new->offset = offset;
 350         new->len = len;
 351         list_add(&new->fi_link, list);
 352
 353         return new;
 354 }
 355
 356 static struct fwnet_partial_datagram *fwnet_pd_new(struct net_device *net,
 357                 struct fwnet_peer *peer, u16 datagram_label, unsigned dg_size,
 358                 void *frag_buf, unsigned frag_off, unsigned frag_len)
 359 {
 360         struct fwnet_partial_datagram *new;
 361         struct fwnet_fragment_info *fi;
 362
 363         new = kmalloc(sizeof(*new), GFP_ATOMIC);
 364         if (!new)
 365                 goto fail;
 366
 367         INIT_LIST_HEAD(&new->fi_list);
 368         fi = fwnet_frag_new(new, frag_off, frag_len);
 369         if (fi == NULL)
 370                 goto fail_w_new;
 371
 372         new->datagram_label = datagram_label;
 373         new->datagram_size = dg_size;
 374         new->skb = dev_alloc_skb(dg_size + LL_RESERVED_SPACE(net));
 375         if (new->skb == NULL)
 376                 goto fail_w_fi;
 377
 378         skb_reserve(new->skb, LL_RESERVED_SPACE(net));
 379         new->pbuf = skb_put(new->skb, dg_size);
 380         memcpy(new->pbuf + frag_off, frag_buf, frag_len);
 381         list_add_tail(&new->pd_link, &peer->pd_list);
 382
 383         return new;
 384
 385 fail_w_fi:
 386         kfree(fi);
 387 fail_w_new:
 388         kfree(new);
 389 fail:
 390         return NULL;
 391 }
 392
 393 static struct fwnet_partial_datagram *fwnet_pd_find(struct fwnet_peer *peer,
 394                                                     u16 datagram_label)
 395 {
 396         struct fwnet_partial_datagram *pd;
 397
 398         list_for_each_entry(pd, &peer->pd_list, pd_link)
 399                 if (pd->datagram_label == datagram_label)
 400                         return pd;
 401
 402         return NULL;
 403 }
 404
 405
 406 static void fwnet_pd_delete(struct fwnet_partial_datagram *old)
 407 {
 408         struct fwnet_fragment_info *fi, *n;
 409
 410         list_for_each_entry_safe(fi, n, &old->fi_list, fi_link)
 411                 kfree(fi);
 412
 413         list_del(&old->pd_link);
 414         dev_kfree_skb_any(old->skb);
 415         kfree(old);
 416 }
 417
 418 static bool fwnet_pd_update(struct fwnet_peer *peer,
 419                 struct fwnet_partial_datagram *pd, void *frag_buf,
 420                 unsigned frag_off, unsigned frag_len)
 421 {
 422         if (fwnet_frag_new(pd, frag_off, frag_len) == NULL)
 423                 return false;
 424
 425         memcpy(pd->pbuf + frag_off, frag_buf, frag_len);
 426
 427         /*
 428          * Move list entry to beginning of list so that oldest partial
 429          * datagrams percolate to the end of the list
 430          */
 431         list_move_tail(&pd->pd_link, &peer->pd_list);
 432
 433         return true;
 434 }
 435
 436 static bool fwnet_pd_is_complete(struct fwnet_partial_datagram *pd)
 437 {
 438         struct fwnet_fragment_info *fi;
 439
 440         fi = list_entry(pd->fi_list.next, struct fwnet_fragment_info, fi_link);
 441
 442         return fi->len == pd->datagram_size;
 443 }
 444
 445 /* caller must hold dev->lock */
 446 static struct fwnet_peer *fwnet_peer_find_by_guid(struct fwnet_device *dev,
 447                                                   u64 guid)
 448 {
 449         struct fwnet_peer *peer;
 450
 451         list_for_each_entry(peer, &dev->peer_list, peer_link)
 452                 if (peer->guid == guid)
 453                         return peer;
 454
 455         return NULL;
 456 }
 457
 458 /* caller must hold dev->lock */
 459 static struct fwnet_peer *fwnet_peer_find_by_node_id(struct fwnet_device *dev,
 460                                                 int node_id, int generation)
 461 {
 462         struct fwnet_peer *peer;
 463
 464         list_for_each_entry(peer, &dev->peer_list, peer_link)
 465                 if (peer->node_id    == node_id &&
 466                     peer->generation == generation)
 467                         return peer;
 468
 469         return NULL;
 470 }
 471
 472 /* See IEEE 1394-2008 table 6-4, table 8-8, table 16-18. */
 473 static unsigned fwnet_max_payload(unsigned max_rec, unsigned speed)
 474 {
 475         max_rec = min(max_rec, speed + 8);
 476         max_rec = clamp(max_rec, 8U, 11U); /* 512...4096 */
 477
 478         return (1 << (max_rec + 1)) - RFC2374_FRAG_HDR_SIZE;
 479 }
 480
 481
 482 static int fwnet_finish_incoming_packet(struct net_device *net,
 483                                         struct sk_buff *skb, u16 source_node_id,
 484                                         bool is_broadcast, u16 ether_type)
 485 {
 486         struct fwnet_device *dev;
 487         int status;
 488         __be64 guid;
 489
 490         switch (ether_type) {
 491         case ETH_P_ARP:
 492         case ETH_P_IP:
 493 #if IS_ENABLED(CONFIG_IPV6)
 494         case ETH_P_IPV6:
 495 #endif
 496                 break;
 497         default:
 498                 goto err;
 499         }
 500
 501         dev = netdev_priv(net);
 502         /* Write metadata, and then pass to the receive level */
 503         skb->dev = net;
 504         skb->ip_summed = CHECKSUM_NONE;
 505
 506         /*
 507          * Parse the encapsulation header. This actually does the job of
 508          * converting to an ethernet-like pseudo frame header.
 509          */
 510         guid = cpu_to_be64(dev->card->guid);
 511         if (dev_hard_header(skb, net, ether_type,
 512                            is_broadcast ? net->broadcast : net->dev_addr,
 513                            NULL, skb->len) >= 0) {
 514                 struct fwnet_header *eth;
 515                 u16 *rawp;
 516                 __be16 protocol;
 517
 518                 skb_reset_mac_header(skb);
 519                 skb_pull(skb, sizeof(*eth));
 520                 eth = (struct fwnet_header *)skb_mac_header(skb);
 521                 if (fwnet_hwaddr_is_multicast(eth->h_dest)) {
 522                         if (memcmp(eth->h_dest, net->broadcast,
 523                                    net->addr_len) == 0)
 524                                 skb->pkt_type = PACKET_BROADCAST;
 525 #if 0
 526                         else
 527                                 skb->pkt_type = PACKET_MULTICAST;
 528 #endif
 529                 } else {
 530                         if (memcmp(eth->h_dest, net->dev_addr, net->addr_len))
 531                                 skb->pkt_type = PACKET_OTHERHOST;
 532                 }
 533                 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN) {
 534                         protocol = eth->h_proto;
 535                 } else {
 536                         rawp = (u16 *)skb->data;
 537                         if (*rawp == 0xffff)
 538                                 protocol = htons(ETH_P_802_3);
 539                         else
 540                                 protocol = htons(ETH_P_802_2);
 541                 }
 542                 skb->protocol = protocol;
 543         }
 544         status = netif_rx(skb);
 545         if (status == NET_RX_DROP) {
 546                 net->stats.rx_errors++;
 547                 net->stats.rx_dropped++;
 548         } else {
 549                 net->stats.rx_packets++;
 550                 net->stats.rx_bytes += skb->len;
 551         }
 552
 553         return 0;
 554
 555  err:
 556         net->stats.rx_errors++;
 557         net->stats.rx_dropped++;
 558
 559         dev_kfree_skb_any(skb);
 560
 561         return -ENOENT;
 562 }
 563
 564 static int fwnet_incoming_packet(struct fwnet_device *dev, __be32 *buf, int len,
 565                                  int source_node_id, int generation,
 566                                  bool is_broadcast)
 567 {
 568         struct sk_buff *skb;
 569         struct net_device *net = dev->netdev;
 570         struct rfc2734_header hdr;
 571         unsigned lf;
 572         unsigned long flags;
 573         struct fwnet_peer *peer;
 574         struct fwnet_partial_datagram *pd;
 575         int fg_off;
 576         int dg_size;
 577         u16 datagram_label;
 578         int retval;
 579         u16 ether_type;
 580
 581         if (len <= RFC2374_UNFRAG_HDR_SIZE)
 582                 return 0;
 583
 584         hdr.w0 = be32_to_cpu(buf[0]);
 585         lf = fwnet_get_hdr_lf(&hdr);
 586         if (lf == RFC2374_HDR_UNFRAG) {
 587                 /*
 588                  * An unfragmented datagram has been received by the ieee1394
 589                  * bus. Build an skbuff around it so we can pass it to the
 590                  * high level network layer.
 591                  */
 592                 ether_type = fwnet_get_hdr_ether_type(&hdr);
 593                 buf++;
 594                 len -= RFC2374_UNFRAG_HDR_SIZE;
 595
 596                 skb = dev_alloc_skb(len + LL_RESERVED_SPACE(net));
 597                 if (unlikely(!skb)) {
 598                         net->stats.rx_dropped++;
 599
 600                         return -ENOMEM;
 601                 }
 602                 skb_reserve(skb, LL_RESERVED_SPACE(net));
 603                 memcpy(skb_put(skb, len), buf, len);
 604
 605                 return fwnet_finish_incoming_packet(net, skb, source_node_id,
 606                                                     is_broadcast, ether_type);
 607         }
 608
 609         /* A datagram fragment has been received, now the fun begins. */
 610
 611         if (len <= RFC2374_FRAG_HDR_SIZE)
 612                 return 0;
 613
 614         hdr.w1 = ntohl(buf[1]);
 615         buf += 2;
 616         len -= RFC2374_FRAG_HDR_SIZE;
 617         if (lf == RFC2374_HDR_FIRSTFRAG) {
 618                 ether_type = fwnet_get_hdr_ether_type(&hdr);
 619                 fg_off = 0;
 620         } else {
 621                 ether_type = 0;
 622                 fg_off = fwnet_get_hdr_fg_off(&hdr);
 623         }
 624         datagram_label = fwnet_get_hdr_dgl(&hdr);
 625         dg_size = fwnet_get_hdr_dg_size(&hdr);
 626
 627         if (fg_off + len > dg_size)
 628                 return 0;
 629
 630         spin_lock_irqsave(&dev->lock, flags);
 631
 632         peer = fwnet_peer_find_by_node_id(dev, source_node_id, generation);
 633         if (!peer) {
 634                 retval = -ENOENT;
 635                 goto fail;
 636         }
 637
 638         pd = fwnet_pd_find(peer, datagram_label);
 639         if (pd == NULL) {
 640                 while (peer->pdg_size >= FWNET_MAX_FRAGMENTS) {
 641                         /* remove the oldest */
 642                         fwnet_pd_delete(list_first_entry(&peer->pd_list,
 643                                 struct fwnet_partial_datagram, pd_link));
 644                         peer->pdg_size--;
 645                 }
 646                 pd = fwnet_pd_new(net, peer, datagram_label,
 647                                   dg_size, buf, fg_off, len);
 648                 if (pd == NULL) {
 649                         retval = -ENOMEM;
 650                         goto fail;
 651                 }
 652                 peer->pdg_size++;
 653         } else {
 654                 if (fwnet_frag_overlap(pd, fg_off, len) ||
 655                     pd->datagram_size != dg_size) {
 656                         /*
 657                          * Differing datagram sizes or overlapping fragments,
 658                          * discard old datagram and start a new one.
 659                          */
 660                         fwnet_pd_delete(pd);
 661                         pd = fwnet_pd_new(net, peer, datagram_label,
 662                                           dg_size, buf, fg_off, len);
 663                         if (pd == NULL) {
 664                                 peer->pdg_size--;
 665                                 retval = -ENOMEM;
 666                                 goto fail;
 667                         }
 668                 } else {
 669                         if (!fwnet_pd_update(peer, pd, buf, fg_off, len)) {
 670                                 /*
 671                                  * Couldn't save off fragment anyway
 672                                  * so might as well obliterate the
 673                                  * datagram now.
 674                                  */
 675                                 fwnet_pd_delete(pd);
 676                                 peer->pdg_size--;
 677                                 retval = -ENOMEM;
 678                                 goto fail;
 679                         }
 680                 }
 681         } /* new datagram or add to existing one */
 682
 683         if (lf == RFC2374_HDR_FIRSTFRAG)
 684                 pd->ether_type = ether_type;
 685
 686         if (fwnet_pd_is_complete(pd)) {
 687                 ether_type = pd->ether_type;
 688                 peer->pdg_size--;
 689                 skb = skb_get(pd->skb);
 690                 fwnet_pd_delete(pd);
 691
 692                 spin_unlock_irqrestore(&dev->lock, flags);
 693
 694                 return fwnet_finish_incoming_packet(net, skb, source_node_id,
 695                                                     false, ether_type);
 696         }
 697         /*
 698          * Datagram is not complete, we're done for the
 699          * moment.
 700          */
 701         retval = 0;
 702  fail:
 703         spin_unlock_irqrestore(&dev->lock, flags);
 704
 705         return retval;
 706 }
 707
 708 static void fwnet_receive_packet(struct fw_card *card, struct fw_request *r,
 709                 int tcode, int destination, int source, int generation,
 710                 unsigned long long offset, void *payload, size_t length,
 711                 void *callback_data)
 712 {
 713         struct fwnet_device *dev = callback_data;
 714         int rcode;
 715
 716         if (destination == IEEE1394_ALL_NODES) {
 717                 kfree(r);
 718
 719                 return;
 720         }
 721
 722         if (offset != dev->handler.offset)
 723                 rcode = RCODE_ADDRESS_ERROR;
 724         else if (tcode != TCODE_WRITE_BLOCK_REQUEST)
 725                 rcode = RCODE_TYPE_ERROR;
 726         else if (fwnet_incoming_packet(dev, payload, length,
 727                                        source, generation, false) != 0) {
 728                 dev_err(&dev->netdev->dev, "incoming packet failure\n");
 729                 rcode = RCODE_CONFLICT_ERROR;
 730         } else
 731                 rcode = RCODE_COMPLETE;
 732
 733         fw_send_response(card, r, rcode);
 734 }
 735
 736 static int gasp_source_id(__be32 *p)
 737 {
 738         return be32_to_cpu(p[0]) >> 16;
 739 }
 740
 741 static u32 gasp_specifier_id(__be32 *p)
 742 {
 743         return (be32_to_cpu(p[0]) & 0xffff) << 8 |
 744                (be32_to_cpu(p[1]) & 0xff000000) >> 24;
 745 }
 746
 747 static u32 gasp_version(__be32 *p)
 748 {
 749         return be32_to_cpu(p[1]) & 0xffffff;
 750 }
 751
 752 static void fwnet_receive_broadcast(struct fw_iso_context *context,
 753                 u32 cycle, size_t header_length, void *header, void *data)
 754 {
 755         struct fwnet_device *dev;
 756         struct fw_iso_packet packet;
 757         __be16 *hdr_ptr;
 758         __be32 *buf_ptr;
 759         int retval;
 760         u32 length;
 761         unsigned long offset;
 762         unsigned long flags;
 763
 764         dev = data;
 765         hdr_ptr = header;
 766         length = be16_to_cpup(hdr_ptr);
 767
 768         spin_lock_irqsave(&dev->lock, flags);
 769
 770         offset = dev->rcv_buffer_size * dev->broadcast_rcv_next_ptr;
 771         buf_ptr = dev->broadcast_rcv_buffer_ptrs[dev->broadcast_rcv_next_ptr++];
 772         if (dev->broadcast_rcv_next_ptr == dev->num_broadcast_rcv_ptrs)
 773                 dev->broadcast_rcv_next_ptr = 0;
 774
 775         spin_unlock_irqrestore(&dev->lock, flags);
 776
 777         if (length > IEEE1394_GASP_HDR_SIZE &&
 778             gasp_specifier_id(buf_ptr) == IANA_SPECIFIER_ID &&
 779             (gasp_version(buf_ptr) == RFC2734_SW_VERSION
 780 #if IS_ENABLED(CONFIG_IPV6)
 781              || gasp_version(buf_ptr) == RFC3146_SW_VERSION
 782 #endif
 783             ))
 784                 fwnet_incoming_packet(dev, buf_ptr + 2,
 785                                       length - IEEE1394_GASP_HDR_SIZE,
 786                                       gasp_source_id(buf_ptr),
 787                                       context->card->generation, true);
 788
 789         packet.payload_length = dev->rcv_buffer_size;
 790         packet.interrupt = 1;
 791         packet.skip = 0;
 792         packet.tag = 3;
 793         packet.sy = 0;
 794         packet.header_length = IEEE1394_GASP_HDR_SIZE;
 795
 796         spin_lock_irqsave(&dev->lock, flags);
 797
 798         retval = fw_iso_context_queue(dev->broadcast_rcv_context, &packet,
 799                                       &dev->broadcast_rcv_buffer, offset);
 800
 801         spin_unlock_irqrestore(&dev->lock, flags);
 802
 803         if (retval >= 0)
 804                 fw_iso_context_queue_flush(dev->broadcast_rcv_context);
 805         else
 806                 dev_err(&dev->netdev->dev, "requeue failed\n");
 807 }
 808
 809 static struct kmem_cache *fwnet_packet_task_cache;
 810
 811 static void fwnet_free_ptask(struct fwnet_packet_task *ptask)
 812 {
 813         dev_kfree_skb_any(ptask->skb);
 814         kmem_cache_free(fwnet_packet_task_cache, ptask);
 815 }
 816
 817 /* Caller must hold dev->lock. */
 818 static void dec_queued_datagrams(struct fwnet_device *dev)
 819 {
 820         if (--dev->queued_datagrams == FWNET_MIN_QUEUED_DATAGRAMS)
 821                 netif_wake_queue(dev->netdev);
 822 }
 823
 824 static int fwnet_send_packet(struct fwnet_packet_task *ptask);
 825
 826 static void fwnet_transmit_packet_done(struct fwnet_packet_task *ptask)
 827 {
 828         struct fwnet_device *dev = ptask->dev;
 829         struct sk_buff *skb = ptask->skb;
 830         unsigned long flags;
 831         bool free;
 832
 833         spin_lock_irqsave(&dev->lock, flags);
 834
 835         ptask->outstanding_pkts--;
 836
 837         /* Check whether we or the networking TX soft-IRQ is last user. */
 838         free = (ptask->outstanding_pkts == 0 && ptask->enqueued);
 839         if (free)
 840                 dec_queued_datagrams(dev);
 841
 842         if (ptask->outstanding_pkts == 0) {
 843                 dev->netdev->stats.tx_packets++;
 844                 dev->netdev->stats.tx_bytes += skb->len;
 845         }
 846
 847         spin_unlock_irqrestore(&dev->lock, flags);
 848
 849         if (ptask->outstanding_pkts > 0) {
 850                 u16 dg_size;
 851                 u16 fg_off;
 852                 u16 datagram_label;
 853                 u16 lf;
 854
 855                 /* Update the ptask to point to the next fragment and send it */
 856                 lf = fwnet_get_hdr_lf(&ptask->hdr);
 857                 switch (lf) {
 858                 case RFC2374_HDR_LASTFRAG:
 859                 case RFC2374_HDR_UNFRAG:
 860                 default:
 861                         dev_err(&dev->netdev->dev,
 862                                 "outstanding packet %x lf %x, header %x,%x\n",
 863                                 ptask->outstanding_pkts, lf, ptask->hdr.w0,
 864                                 ptask->hdr.w1);
 865                         BUG();
 866
 867                 case RFC2374_HDR_FIRSTFRAG:
 868                         /* Set frag type here for future interior fragments */
 869                         dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
 870                         fg_off = ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
 871                         datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
 872                         break;
 873
 874                 case RFC2374_HDR_INTFRAG:
 875                         dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
 876                         fg_off = fwnet_get_hdr_fg_off(&ptask->hdr)
 877                                   + ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
 878                         datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
 879                         break;
 880                 }
 881
 882                 if (ptask->dest_node == IEEE1394_ALL_NODES) {
 883                         skb_pull(skb,
 884                                  ptask->max_payload + IEEE1394_GASP_HDR_SIZE);
 885                 } else {
 886                         skb_pull(skb, ptask->max_payload);
 887                 }
 888                 if (ptask->outstanding_pkts > 1) {
 889                         fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_INTFRAG,
 890                                           dg_size, fg_off, datagram_label);
 891                 } else {
 892                         fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_LASTFRAG,
 893                                           dg_size, fg_off, datagram_label);
 894                         ptask->max_payload = skb->len + RFC2374_FRAG_HDR_SIZE;
 895                 }
 896                 fwnet_send_packet(ptask);
 897         }
 898
 899         if (free)
 900                 fwnet_free_ptask(ptask);
 901 }
 902
 903 static void fwnet_transmit_packet_failed(struct fwnet_packet_task *ptask)
 904 {
 905         struct fwnet_device *dev = ptask->dev;
 906         unsigned long flags;
 907         bool free;
 908
 909         spin_lock_irqsave(&dev->lock, flags);
 910
 911         /* One fragment failed; don't try to send remaining fragments. */
 912         ptask->outstanding_pkts = 0;
 913
 914         /* Check whether we or the networking TX soft-IRQ is last user. */
 915         free = ptask->enqueued;
 916         if (free)
 917                 dec_queued_datagrams(dev);
 918
 919         dev->netdev->stats.tx_dropped++;
 920         dev->netdev->stats.tx_errors++;
 921
 922         spin_unlock_irqrestore(&dev->lock, flags);
 923
 924         if (free)
 925                 fwnet_free_ptask(ptask);
 926 }
 927
 928 static void fwnet_write_complete(struct fw_card *card, int rcode,
 929                                  void *payload, size_t length, void *data)
 930 {
 931         struct fwnet_packet_task *ptask = data;
 932         static unsigned long j;
 933         static int last_rcode, errors_skipped;
 934
 935         if (rcode == RCODE_COMPLETE) {
 936                 fwnet_transmit_packet_done(ptask);
 937         } else {
 938                 if (printk_timed_ratelimit(&j,  1000) || rcode != last_rcode) {
 939                         dev_err(&ptask->dev->netdev->dev,
 940                                 "fwnet_write_complete failed: %x (skipped %d)\n",
 941                                 rcode, errors_skipped);
 942
 943                         errors_skipped = 0;
 944                         last_rcode = rcode;
 945                 } else {
 946                         errors_skipped++;
 947                 }
 948                 fwnet_transmit_packet_failed(ptask);
 949         }
 950 }
 951
 952 static int fwnet_send_packet(struct fwnet_packet_task *ptask)
 953 {
 954         struct fwnet_device *dev;
 955         unsigned tx_len;
 956         struct rfc2734_header *bufhdr;
 957         unsigned long flags;
 958         bool free;
 959
 960         dev = ptask->dev;
 961         tx_len = ptask->max_payload;
 962         switch (fwnet_get_hdr_lf(&ptask->hdr)) {
 963         case RFC2374_HDR_UNFRAG:
 964                 bufhdr = (struct rfc2734_header *)
 965                                 skb_push(ptask->skb, RFC2374_UNFRAG_HDR_SIZE);
 966                 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
 967                 break;
 968
 969         case RFC2374_HDR_FIRSTFRAG:
 970         case RFC2374_HDR_INTFRAG:
 971         case RFC2374_HDR_LASTFRAG:
 972                 bufhdr = (struct rfc2734_header *)
 973                                 skb_push(ptask->skb, RFC2374_FRAG_HDR_SIZE);
 974                 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
 975                 put_unaligned_be32(ptask->hdr.w1, &bufhdr->w1);
 976                 break;
 977
 978         default:
 979                 BUG();
 980         }
 981         if (ptask->dest_node == IEEE1394_ALL_NODES) {
 982                 u8 *p;
 983                 int generation;
 984                 int node_id;
 985                 unsigned int sw_version;
 986
 987                 /* ptask->generation may not have been set yet */
 988                 generation = dev->card->generation;
 989                 smp_rmb();
 990                 node_id = dev->card->node_id;
 991
 992                 switch (ptask->skb->protocol) {
 993                 default:
 994                         sw_version = RFC2734_SW_VERSION;
 995                         break;
 996 #if IS_ENABLED(CONFIG_IPV6)
 997                 case htons(ETH_P_IPV6):
 998                         sw_version = RFC3146_SW_VERSION;
 999 #endif
1000                 }
1001
1002                 p = skb_push(ptask->skb, IEEE1394_GASP_HDR_SIZE);
1003                 put_unaligned_be32(node_id << 16 | IANA_SPECIFIER_ID >> 8, p);
1004                 put_unaligned_be32((IANA_SPECIFIER_ID & 0xff) << 24
1005                                                 | sw_version, &p[4]);
1006
1007                 /* We should not transmit if broadcast_channel.valid == 0. */
1008                 fw_send_request(dev->card, &ptask->transaction,
1009                                 TCODE_STREAM_DATA,
1010                                 fw_stream_packet_destination_id(3,
1011                                                 IEEE1394_BROADCAST_CHANNEL, 0),
1012                                 generation, SCODE_100, 0ULL, ptask->skb->data,
1013                                 tx_len + 8, fwnet_write_complete, ptask);
1014
1015                 spin_lock_irqsave(&dev->lock, flags);
1016
1017                 /* If the AT tasklet already ran, we may be last user. */
1018                 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1019                 if (!free)
1020                         ptask->enqueued = true;
1021                 else
1022                         dec_queued_datagrams(dev);
1023
1024                 spin_unlock_irqrestore(&dev->lock, flags);
1025
1026                 goto out;
1027         }
1028
1029         fw_send_request(dev->card, &ptask->transaction,
1030                         TCODE_WRITE_BLOCK_REQUEST, ptask->dest_node,
1031                         ptask->generation, ptask->speed, ptask->fifo_addr,
1032                         ptask->skb->data, tx_len, fwnet_write_complete, ptask);
1033
1034         spin_lock_irqsave(&dev->lock, flags);
1035
1036         /* If the AT tasklet already ran, we may be last user. */
1037         free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1038         if (!free)
1039                 ptask->enqueued = true;
1040         else
1041                 dec_queued_datagrams(dev);
1042
1043         spin_unlock_irqrestore(&dev->lock, flags);
1044
1045         netif_trans_update(dev->netdev);
1046  out:
1047         if (free)
1048                 fwnet_free_ptask(ptask);
1049
1050         return 0;
1051 }
1052
1053 static void fwnet_fifo_stop(struct fwnet_device *dev)
1054 {
1055         if (dev->local_fifo == FWNET_NO_FIFO_ADDR)
1056                 return;
1057
1058         fw_core_remove_address_handler(&dev->handler);
1059         dev->local_fifo = FWNET_NO_FIFO_ADDR;
1060 }
1061
1062 static int fwnet_fifo_start(struct fwnet_device *dev)
1063 {
1064         int retval;
1065
1066         if (dev->local_fifo != FWNET_NO_FIFO_ADDR)
1067                 return 0;
1068
1069         dev->handler.length = 4096;
1070         dev->handler.address_callback = fwnet_receive_packet;
1071         dev->handler.callback_data = dev;
1072
1073         retval = fw_core_add_address_handler(&dev->handler,
1074                                              &fw_high_memory_region);
1075         if (retval < 0)
1076                 return retval;
1077
1078         dev->local_fifo = dev->handler.offset;
1079
1080         return 0;
1081 }
1082
1083 static void __fwnet_broadcast_stop(struct fwnet_device *dev)
1084 {
1085         unsigned u;
1086
1087         if (dev->broadcast_state != FWNET_BROADCAST_ERROR) {
1088                 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++)
1089                         kunmap(dev->broadcast_rcv_buffer.pages[u]);
1090                 fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer, dev->card);
1091         }
1092         if (dev->broadcast_rcv_context) {
1093                 fw_iso_context_destroy(dev->broadcast_rcv_context);
1094                 dev->broadcast_rcv_context = NULL;
1095         }
1096         kfree(dev->broadcast_rcv_buffer_ptrs);
1097         dev->broadcast_rcv_buffer_ptrs = NULL;
1098         dev->broadcast_state = FWNET_BROADCAST_ERROR;
1099 }
1100
1101 static void fwnet_broadcast_stop(struct fwnet_device *dev)
1102 {
1103         if (dev->broadcast_state == FWNET_BROADCAST_ERROR)
1104                 return;
1105         fw_iso_context_stop(dev->broadcast_rcv_context);
1106         __fwnet_broadcast_stop(dev);
1107 }
1108
1109 static int fwnet_broadcast_start(struct fwnet_device *dev)
1110 {
1111         struct fw_iso_context *context;
1112         int retval;
1113         unsigned num_packets;
1114         unsigned max_receive;
1115         struct fw_iso_packet packet;
1116         unsigned long offset;
1117         void **ptrptr;
1118         unsigned u;
1119
1120         if (dev->broadcast_state != FWNET_BROADCAST_ERROR)
1121                 return 0;
1122
1123         max_receive = 1U << (dev->card->max_receive + 1);
1124         num_packets = (FWNET_ISO_PAGE_COUNT * PAGE_SIZE) / max_receive;
1125
1126         ptrptr = kmalloc(sizeof(void *) * num_packets, GFP_KERNEL);
1127         if (!ptrptr) {
1128                 retval = -ENOMEM;
1129                 goto failed;
1130         }
1131         dev->broadcast_rcv_buffer_ptrs = ptrptr;
1132
1133         context = fw_iso_context_create(dev->card, FW_ISO_CONTEXT_RECEIVE,
1134                                         IEEE1394_BROADCAST_CHANNEL,
1135                                         dev->card->link_speed, 8,
1136                                         fwnet_receive_broadcast, dev);
1137         if (IS_ERR(context)) {
1138                 retval = PTR_ERR(context);
1139                 goto failed;
1140         }
1141
1142         retval = fw_iso_buffer_init(&dev->broadcast_rcv_buffer, dev->card,
1143                                     FWNET_ISO_PAGE_COUNT, DMA_FROM_DEVICE);
1144         if (retval < 0)
1145                 goto failed;
1146
1147         dev->broadcast_state = FWNET_BROADCAST_STOPPED;
1148
1149         for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++) {
1150                 void *ptr;
1151                 unsigned v;
1152
1153                 ptr = kmap(dev->broadcast_rcv_buffer.pages[u]);
1154                 for (v = 0; v < num_packets / FWNET_ISO_PAGE_COUNT; v++)
1155                         *ptrptr++ = (void *) ((char *)ptr + v * max_receive);
1156         }
1157         dev->broadcast_rcv_context = context;
1158
1159         packet.payload_length = max_receive;
1160         packet.interrupt = 1;
1161         packet.skip = 0;
1162         packet.tag = 3;
1163         packet.sy = 0;
1164         packet.header_length = IEEE1394_GASP_HDR_SIZE;
1165         offset = 0;
1166
1167         for (u = 0; u < num_packets; u++) {
1168                 retval = fw_iso_context_queue(context, &packet,
1169                                 &dev->broadcast_rcv_buffer, offset);
1170                 if (retval < 0)
1171                         goto failed;
1172
1173                 offset += max_receive;
1174         }
1175         dev->num_broadcast_rcv_ptrs = num_packets;
1176         dev->rcv_buffer_size = max_receive;
1177         dev->broadcast_rcv_next_ptr = 0U;
1178         retval = fw_iso_context_start(context, -1, 0,
1179                         FW_ISO_CONTEXT_MATCH_ALL_TAGS); /* ??? sync */
1180         if (retval < 0)
1181                 goto failed;
1182
1183         /* FIXME: adjust it according to the min. speed of all known peers? */
1184         dev->broadcast_xmt_max_payload = IEEE1394_MAX_PAYLOAD_S100
1185                         - IEEE1394_GASP_HDR_SIZE - RFC2374_UNFRAG_HDR_SIZE;
1186         dev->broadcast_state = FWNET_BROADCAST_RUNNING;
1187
1188         return 0;
1189
1190  failed:
1191         __fwnet_broadcast_stop(dev);
1192         return retval;
1193 }
1194
1195 static void set_carrier_state(struct fwnet_device *dev)
1196 {
1197         if (dev->peer_count > 1)
1198                 netif_carrier_on(dev->netdev);
1199         else
1200                 netif_carrier_off(dev->netdev);
1201 }
1202
1203 /* ifup */
1204 static int fwnet_open(struct net_device *net)
1205 {
1206         struct fwnet_device *dev = netdev_priv(net);
1207         int ret;
1208
1209         ret = fwnet_broadcast_start(dev);
1210         if (ret)
1211                 return ret;
1212
1213         netif_start_queue(net);
1214
1215         spin_lock_irq(&dev->lock);
1216         set_carrier_state(dev);
1217         spin_unlock_irq(&dev->lock);
1218
1219         return 0;
1220 }
1221
1222 /* ifdown */
1223 static int fwnet_stop(struct net_device *net)
1224 {
1225         struct fwnet_device *dev = netdev_priv(net);
1226
1227         netif_stop_queue(net);
1228         fwnet_broadcast_stop(dev);
1229
1230         return 0;
1231 }
1232
1233 static netdev_tx_t fwnet_tx(struct sk_buff *skb, struct net_device *net)
1234 {
1235         struct fwnet_header hdr_buf;
1236         struct fwnet_device *dev = netdev_priv(net);
1237         __be16 proto;
1238         u16 dest_node;
1239         unsigned max_payload;
1240         u16 dg_size;
1241         u16 *datagram_label_ptr;
1242         struct fwnet_packet_task *ptask;
1243         struct fwnet_peer *peer;
1244         unsigned long flags;
1245
1246         spin_lock_irqsave(&dev->lock, flags);
1247
1248         /* Can this happen? */
1249         if (netif_queue_stopped(dev->netdev)) {
1250                 spin_unlock_irqrestore(&dev->lock, flags);
1251
1252                 return NETDEV_TX_BUSY;
1253         }
1254
1255         ptask = kmem_cache_alloc(fwnet_packet_task_cache, GFP_ATOMIC);
1256         if (ptask == NULL)
1257                 goto fail;
1258
1259         skb = skb_share_check(skb, GFP_ATOMIC);
1260         if (!skb)
1261                 goto fail;
1262
1263         /*
1264          * Make a copy of the driver-specific header.
1265          * We might need to rebuild the header on tx failure.
1266          */
1267         memcpy(&hdr_buf, skb->data, sizeof(hdr_buf));
1268         proto = hdr_buf.h_proto;
1269
1270         switch (proto) {
1271         case htons(ETH_P_ARP):
1272         case htons(ETH_P_IP):
1273 #if IS_ENABLED(CONFIG_IPV6)
1274         case htons(ETH_P_IPV6):
1275 #endif
1276                 break;
1277         default:
1278                 goto fail;
1279         }
1280
1281         skb_pull(skb, sizeof(hdr_buf));
1282         dg_size = skb->len;
1283
1284         /*
1285          * Set the transmission type for the packet.  ARP packets and IP
1286          * broadcast packets are sent via GASP.
1287          */
1288         if (fwnet_hwaddr_is_multicast(hdr_buf.h_dest)) {
1289                 max_payload        = dev->broadcast_xmt_max_payload;
1290                 datagram_label_ptr = &dev->broadcast_xmt_datagramlabel;
1291
1292                 ptask->fifo_addr   = FWNET_NO_FIFO_ADDR;
1293                 ptask->generation  = 0;
1294                 ptask->dest_node   = IEEE1394_ALL_NODES;
1295                 ptask->speed       = SCODE_100;
1296         } else {
1297                 union fwnet_hwaddr *ha = (union fwnet_hwaddr *)hdr_buf.h_dest;
1298                 __be64 guid = get_unaligned(&ha->uc.uniq_id);
1299                 u8 generation;
1300
1301                 peer = fwnet_peer_find_by_guid(dev, be64_to_cpu(guid));
1302                 if (!peer)
1303                         goto fail;
1304
1305                 generation         = peer->generation;
1306                 dest_node          = peer->node_id;
1307                 max_payload        = peer->max_payload;
1308                 datagram_label_ptr = &peer->datagram_label;
1309
1310                 ptask->fifo_addr   = fwnet_hwaddr_fifo(ha);
1311                 ptask->generation  = generation;
1312                 ptask->dest_node   = dest_node;
1313                 ptask->speed       = peer->speed;
1314         }
1315
1316         ptask->hdr.w0 = 0;
1317         ptask->hdr.w1 = 0;
1318         ptask->skb = skb;
1319         ptask->dev = dev;
1320
1321         /* Does it all fit in one packet? */
1322         if (dg_size <= max_payload) {
1323                 fwnet_make_uf_hdr(&ptask->hdr, ntohs(proto));
1324                 ptask->outstanding_pkts = 1;
1325                 max_payload = dg_size + RFC2374_UNFRAG_HDR_SIZE;
1326         } else {
1327                 u16 datagram_label;
1328
1329                 max_payload -= RFC2374_FRAG_OVERHEAD;
1330                 datagram_label = (*datagram_label_ptr)++;
1331                 fwnet_make_ff_hdr(&ptask->hdr, ntohs(proto), dg_size,
1332                                   datagram_label);
1333                 ptask->outstanding_pkts = DIV_ROUND_UP(dg_size, max_payload);
1334                 max_payload += RFC2374_FRAG_HDR_SIZE;
1335         }
1336
1337         if (++dev->queued_datagrams == FWNET_MAX_QUEUED_DATAGRAMS)
1338                 netif_stop_queue(dev->netdev);
1339
1340         spin_unlock_irqrestore(&dev->lock, flags);
1341
1342         ptask->max_payload = max_payload;
1343         ptask->enqueued    = 0;
1344
1345         fwnet_send_packet(ptask);
1346
1347         return NETDEV_TX_OK;
1348
1349  fail:
1350         spin_unlock_irqrestore(&dev->lock, flags);
1351
1352         if (ptask)
1353                 kmem_cache_free(fwnet_packet_task_cache, ptask);
1354
1355         if (skb != NULL)
1356                 dev_kfree_skb(skb);
1357
1358         net->stats.tx_dropped++;
1359         net->stats.tx_errors++;
1360
1361         /*
1362          * FIXME: According to a patch from 2003-02-26, "returning non-zero
1363          * causes serious problems" here, allegedly.  Before that patch,
1364          * -ERRNO was returned which is not appropriate under Linux 2.6.
1365          * Perhaps more needs to be done?  Stop the queue in serious
1366          * conditions and restart it elsewhere?
1367          */
1368         return NETDEV_TX_OK;
1369 }
1370
1371 static int fwnet_change_mtu(struct net_device *net, int new_mtu)
1372 {
1373         if (new_mtu < 68)
1374                 return -EINVAL;
1375
1376         net->mtu = new_mtu;
1377         return 0;
1378 }
1379
1380 static const struct ethtool_ops fwnet_ethtool_ops = {
1381         .get_link       = ethtool_op_get_link,
1382 };
1383
1384 static const struct net_device_ops fwnet_netdev_ops = {
1385         .ndo_open       = fwnet_open,
1386         .ndo_stop       = fwnet_stop,
1387         .ndo_start_xmit = fwnet_tx,
1388         .ndo_change_mtu = fwnet_change_mtu,
1389 };
1390
1391 static void fwnet_init_dev(struct net_device *net)
1392 {
1393         net->header_ops         = &fwnet_header_ops;
1394         net->netdev_ops         = &fwnet_netdev_ops;
1395         net->watchdog_timeo     = 2 * HZ;
1396         net->flags              = IFF_BROADCAST | IFF_MULTICAST;
1397         net->features           = NETIF_F_HIGHDMA;
1398         net->addr_len           = FWNET_ALEN;
1399         net->hard_header_len    = FWNET_HLEN;
1400         net->type               = ARPHRD_IEEE1394;
1401         net->tx_queue_len       = FWNET_TX_QUEUE_LEN;
1402         net->ethtool_ops        = &fwnet_ethtool_ops;
1403 }
1404
1405 /* caller must hold fwnet_device_mutex */
1406 static struct fwnet_device *fwnet_dev_find(struct fw_card *card)
1407 {
1408         struct fwnet_device *dev;
1409
1410         list_for_each_entry(dev, &fwnet_device_list, dev_link)
1411                 if (dev->card == card)
1412                         return dev;
1413
1414         return NULL;
1415 }
1416
1417 static int fwnet_add_peer(struct fwnet_device *dev,
1418                           struct fw_unit *unit, struct fw_device *device)
1419 {
1420         struct fwnet_peer *peer;
1421
1422         peer = kmalloc(sizeof(*peer), GFP_KERNEL);
1423         if (!peer)
1424                 return -ENOMEM;
1425
1426         dev_set_drvdata(&unit->device, peer);
1427
1428         peer->dev = dev;
1429         peer->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4];
1430         INIT_LIST_HEAD(&peer->pd_list);
1431         peer->pdg_size = 0;
1432         peer->datagram_label = 0;
1433         peer->speed = device->max_speed;
1434         peer->max_payload = fwnet_max_payload(device->max_rec, peer->speed);
1435
1436         peer->generation = device->generation;
1437         smp_rmb();
1438         peer->node_id = device->node_id;
1439
1440         spin_lock_irq(&dev->lock);
1441         list_add_tail(&peer->peer_link, &dev->peer_list);
1442         dev->peer_count++;
1443         set_carrier_state(dev);
1444         spin_unlock_irq(&dev->lock);
1445
1446         return 0;
1447 }
1448
1449 static int fwnet_probe(struct fw_unit *unit,
1450                        const struct ieee1394_device_id *id)
1451 {
1452         struct fw_device *device = fw_parent_device(unit);
1453         struct fw_card *card = device->card;
1454         struct net_device *net;
1455         bool allocated_netdev = false;
1456         struct fwnet_device *dev;
1457         unsigned max_mtu;
1458         int ret;
1459         union fwnet_hwaddr *ha;
1460
1461         mutex_lock(&fwnet_device_mutex);
1462
1463         dev = fwnet_dev_find(card);
1464         if (dev) {
1465                 net = dev->netdev;
1466                 goto have_dev;
1467         }
1468
1469         net = alloc_netdev(sizeof(*dev), "firewire%d", NET_NAME_UNKNOWN,
1470                            fwnet_init_dev);
1471         if (net == NULL) {
1472                 mutex_unlock(&fwnet_device_mutex);
1473                 return -ENOMEM;
1474         }
1475
1476         allocated_netdev = true;
1477         SET_NETDEV_DEV(net, card->device);
1478         dev = netdev_priv(net);
1479
1480         spin_lock_init(&dev->lock);
1481         dev->broadcast_state = FWNET_BROADCAST_ERROR;
1482         dev->broadcast_rcv_context = NULL;
1483         dev->broadcast_xmt_max_payload = 0;
1484         dev->broadcast_xmt_datagramlabel = 0;
1485         dev->local_fifo = FWNET_NO_FIFO_ADDR;
1486         dev->queued_datagrams = 0;
1487         INIT_LIST_HEAD(&dev->peer_list);
1488         dev->card = card;
1489         dev->netdev = net;
1490
1491         ret = fwnet_fifo_start(dev);
1492         if (ret < 0)
1493                 goto out;
1494         dev->local_fifo = dev->handler.offset;
1495
1496         /*
1497          * Use the RFC 2734 default 1500 octets or the maximum payload
1498          * as initial MTU
1499          */
1500         max_mtu = (1 << (card->max_receive + 1))
1501                   - sizeof(struct rfc2734_header) - IEEE1394_GASP_HDR_SIZE;
1502         net->mtu = min(1500U, max_mtu);
1503
1504         /* Set our hardware address while we're at it */
1505         ha = (union fwnet_hwaddr *)net->dev_addr;
1506         put_unaligned_be64(card->guid, &ha->uc.uniq_id);
1507         ha->uc.max_rec = dev->card->max_receive;
1508         ha->uc.sspd = dev->card->link_speed;
1509         put_unaligned_be16(dev->local_fifo >> 32, &ha->uc.fifo_hi);
1510         put_unaligned_be32(dev->local_fifo & 0xffffffff, &ha->uc.fifo_lo);
1511
1512         memset(net->broadcast, -1, net->addr_len);
1513
1514         ret = register_netdev(net);
1515         if (ret)
1516                 goto out;
1517
1518         list_add_tail(&dev->dev_link, &fwnet_device_list);
1519         dev_notice(&net->dev, "IP over IEEE 1394 on card %s\n",
1520                    dev_name(card->device));
1521  have_dev:
1522         ret = fwnet_add_peer(dev, unit, device);
1523         if (ret && allocated_netdev) {
1524                 unregister_netdev(net);
1525                 list_del(&dev->dev_link);
1526  out:
1527                 fwnet_fifo_stop(dev);
1528                 free_netdev(net);
1529         }
1530
1531         mutex_unlock(&fwnet_device_mutex);
1532
1533         return ret;
1534 }
1535
1536 /*
1537  * FIXME abort partially sent fragmented datagrams,
1538  * discard partially received fragmented datagrams
1539  */
1540 static void fwnet_update(struct fw_unit *unit)
1541 {
1542         struct fw_device *device = fw_parent_device(unit);
1543         struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1544         int generation;
1545
1546         generation = device->generation;
1547
1548         spin_lock_irq(&peer->dev->lock);
1549         peer->node_id    = device->node_id;
1550         peer->generation = generation;
1551         spin_unlock_irq(&peer->dev->lock);
1552 }
1553
1554 static void fwnet_remove_peer(struct fwnet_peer *peer, struct fwnet_device *dev)
1555 {
1556         struct fwnet_partial_datagram *pd, *pd_next;
1557
1558         spin_lock_irq(&dev->lock);
1559         list_del(&peer->peer_link);
1560         dev->peer_count--;
1561         set_carrier_state(dev);
1562         spin_unlock_irq(&dev->lock);
1563
1564         list_for_each_entry_safe(pd, pd_next, &peer->pd_list, pd_link)
1565                 fwnet_pd_delete(pd);
1566
1567         kfree(peer);
1568 }
1569
1570 static void fwnet_remove(struct fw_unit *unit)
1571 {
1572         struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1573         struct fwnet_device *dev = peer->dev;
1574         struct net_device *net;
1575         int i;
1576
1577         mutex_lock(&fwnet_device_mutex);
1578
1579         net = dev->netdev;
1580
1581         fwnet_remove_peer(peer, dev);
1582
1583         if (list_empty(&dev->peer_list)) {
1584                 unregister_netdev(net);
1585
1586                 fwnet_fifo_stop(dev);
1587
1588                 for (i = 0; dev->queued_datagrams && i < 5; i++)
1589                         ssleep(1);
1590                 WARN_ON(dev->queued_datagrams);
1591                 list_del(&dev->dev_link);
1592
1593                 free_netdev(net);
1594         }
1595
1596         mutex_unlock(&fwnet_device_mutex);
1597 }
1598
1599 static const struct ieee1394_device_id fwnet_id_table[] = {
1600         {
1601                 .match_flags  = IEEE1394_MATCH_SPECIFIER_ID |
1602                                 IEEE1394_MATCH_VERSION,
1603                 .specifier_id = IANA_SPECIFIER_ID,
1604                 .version      = RFC2734_SW_VERSION,
1605         },
1606 #if IS_ENABLED(CONFIG_IPV6)
1607         {
1608                 .match_flags  = IEEE1394_MATCH_SPECIFIER_ID |
1609                                 IEEE1394_MATCH_VERSION,
1610                 .specifier_id = IANA_SPECIFIER_ID,
1611                 .version      = RFC3146_SW_VERSION,
1612         },
1613 #endif
1614         { }
1615 };
1616
1617 static struct fw_driver fwnet_driver = {
1618         .driver = {
1619                 .owner  = THIS_MODULE,
1620                 .name   = KBUILD_MODNAME,
1621                 .bus    = &fw_bus_type,
1622         },
1623         .probe    = fwnet_probe,
1624         .update   = fwnet_update,
1625         .remove   = fwnet_remove,
1626         .id_table = fwnet_id_table,
1627 };
1628
1629 static const u32 rfc2374_unit_directory_data[] = {
1630         0x00040000,     /* directory_length             */
1631         0x1200005e,     /* unit_specifier_id: IANA      */
1632         0x81000003,     /* textual descriptor offset    */
1633         0x13000001,     /* unit_sw_version: RFC 2734    */
1634         0x81000005,     /* textual descriptor offset    */
1635         0x00030000,     /* descriptor_length            */
1636         0x00000000,     /* text                         */
1637         0x00000000,     /* minimal ASCII, en            */
1638         0x49414e41,     /* I A N A                      */
1639         0x00030000,     /* descriptor_length            */
1640         0x00000000,     /* text                         */
1641         0x00000000,     /* minimal ASCII, en            */
1642         0x49507634,     /* I P v 4                      */
1643 };
1644
1645 static struct fw_descriptor rfc2374_unit_directory = {
1646         .length = ARRAY_SIZE(rfc2374_unit_directory_data),
1647         .key    = (CSR_DIRECTORY | CSR_UNIT) << 24,
1648         .data   = rfc2374_unit_directory_data
1649 };
1650
1651 #if IS_ENABLED(CONFIG_IPV6)
1652 static const u32 rfc3146_unit_directory_data[] = {
1653         0x00040000,     /* directory_length             */
1654         0x1200005e,     /* unit_specifier_id: IANA      */
1655         0x81000003,     /* textual descriptor offset    */
1656         0x13000002,     /* unit_sw_version: RFC 3146    */
1657         0x81000005,     /* textual descriptor offset    */
1658         0x00030000,     /* descriptor_length            */
1659         0x00000000,     /* text                         */
1660         0x00000000,     /* minimal ASCII, en            */
1661         0x49414e41,     /* I A N A                      */
1662         0x00030000,     /* descriptor_length            */
1663         0x00000000,     /* text                         */
1664         0x00000000,     /* minimal ASCII, en            */
1665         0x49507636,     /* I P v 6                      */
1666 };
1667
1668 static struct fw_descriptor rfc3146_unit_directory = {
1669         .length = ARRAY_SIZE(rfc3146_unit_directory_data),
1670         .key    = (CSR_DIRECTORY | CSR_UNIT) << 24,
1671         .data   = rfc3146_unit_directory_data
1672 };
1673 #endif
1674
1675 static int __init fwnet_init(void)
1676 {
1677         int err;
1678
1679         err = fw_core_add_descriptor(&rfc2374_unit_directory);
1680         if (err)
1681                 return err;
1682
1683 #if IS_ENABLED(CONFIG_IPV6)
1684         err = fw_core_add_descriptor(&rfc3146_unit_directory);
1685         if (err)
1686                 goto out;
1687 #endif
1688
1689         fwnet_packet_task_cache = kmem_cache_create("packet_task",
1690                         sizeof(struct fwnet_packet_task), 0, 0, NULL);
1691         if (!fwnet_packet_task_cache) {
1692                 err = -ENOMEM;
1693                 goto out2;
1694         }
1695
1696         err = driver_register(&fwnet_driver.driver);
1697         if (!err)
1698                 return 0;
1699
1700         kmem_cache_destroy(fwnet_packet_task_cache);
1701 out2:
1702 #if IS_ENABLED(CONFIG_IPV6)
1703         fw_core_remove_descriptor(&rfc3146_unit_directory);
1704 out:
1705 #endif
1706         fw_core_remove_descriptor(&rfc2374_unit_directory);
1707
1708         return err;
1709 }
1710 module_init(fwnet_init);
1711
1712 static void __exit fwnet_cleanup(void)
1713 {
1714         driver_unregister(&fwnet_driver.driver);
1715         kmem_cache_destroy(fwnet_packet_task_cache);
1716 #if IS_ENABLED(CONFIG_IPV6)
1717         fw_core_remove_descriptor(&rfc3146_unit_directory);
1718 #endif
1719         fw_core_remove_descriptor(&rfc2374_unit_directory);
1720 }
1721 module_exit(fwnet_cleanup);
1722
1723 MODULE_AUTHOR("Jay Fenlason <fenlason@redhat.com>");
1724 MODULE_DESCRIPTION("IP over IEEE1394 as per RFC 2734/3146");
1725 MODULE_LICENSE("GPL");
1726 MODULE_DEVICE_TABLE(ieee1394, fwnet_id_table);