drivers/firewire/net.c

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