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