linux/drivers/firewire/net.c
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   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
  63static bool fwnet_hwaddr_is_multicast(u8 *ha)
  64{
  65        return !!(*ha & 1);
  66}
  67
  68/* IPv4 and IPv6 encapsulation header */
  69struct 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)
  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) << 16)
  83#define fwnet_set_hdr_fg_off(fgo)       (fgo)
  84
  85#define fwnet_set_hdr_dgl(dgl)          ((dgl) << 16)
  86
  87static 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
  94static 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
 103static 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 */
 113struct fwnet_fragment_info {
 114        struct list_head fi_link;
 115        u16 offset;
 116        u16 len;
 117};
 118
 119struct 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
 130static DEFINE_MUTEX(fwnet_device_mutex);
 131static LIST_HEAD(fwnet_device_list);
 132
 133struct 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
 171struct 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.  */
 188struct 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 */
 206static __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 */
 216static int fwnet_header_create(struct sk_buff *skb, struct net_device *net,
 217                        unsigned short type, const void *daddr,
 218                        const void *saddr, unsigned len)
 219{
 220        struct fwnet_header *h;
 221
 222        h = (struct fwnet_header *)skb_push(skb, sizeof(*h));
 223        put_unaligned_be16(type, &h->h_proto);
 224
 225        if (net->flags & (IFF_LOOPBACK | IFF_NOARP)) {
 226                memset(h->h_dest, 0, net->addr_len);
 227
 228                return net->hard_header_len;
 229        }
 230
 231        if (daddr) {
 232                memcpy(h->h_dest, daddr, net->addr_len);
 233
 234                return net->hard_header_len;
 235        }
 236
 237        return -net->hard_header_len;
 238}
 239
 240static int fwnet_header_rebuild(struct sk_buff *skb)
 241{
 242        struct fwnet_header *h = (struct fwnet_header *)skb->data;
 243
 244        if (get_unaligned_be16(&h->h_proto) == ETH_P_IP)
 245                return arp_find((unsigned char *)&h->h_dest, skb);
 246
 247        dev_notice(&skb->dev->dev, "unable to resolve type %04x addresses\n",
 248                   be16_to_cpu(h->h_proto));
 249        return 0;
 250}
 251
 252static int fwnet_header_cache(const struct neighbour *neigh,
 253                              struct hh_cache *hh, __be16 type)
 254{
 255        struct net_device *net;
 256        struct fwnet_header *h;
 257
 258        if (type == cpu_to_be16(ETH_P_802_3))
 259                return -1;
 260        net = neigh->dev;
 261        h = (struct fwnet_header *)((u8 *)hh->hh_data + HH_DATA_OFF(sizeof(*h)));
 262        h->h_proto = type;
 263        memcpy(h->h_dest, neigh->ha, net->addr_len);
 264        hh->hh_len = FWNET_HLEN;
 265
 266        return 0;
 267}
 268
 269/* Called by Address Resolution module to notify changes in address. */
 270static void fwnet_header_cache_update(struct hh_cache *hh,
 271                const struct net_device *net, const unsigned char *haddr)
 272{
 273        memcpy((u8 *)hh->hh_data + HH_DATA_OFF(FWNET_HLEN), haddr, net->addr_len);
 274}
 275
 276static int fwnet_header_parse(const struct sk_buff *skb, unsigned char *haddr)
 277{
 278        memcpy(haddr, skb->dev->dev_addr, FWNET_ALEN);
 279
 280        return FWNET_ALEN;
 281}
 282
 283static const struct header_ops fwnet_header_ops = {
 284        .create         = fwnet_header_create,
 285        .rebuild        = fwnet_header_rebuild,
 286        .cache          = fwnet_header_cache,
 287        .cache_update   = fwnet_header_cache_update,
 288        .parse          = fwnet_header_parse,
 289};
 290
 291/* FIXME: is this correct for all cases? */
 292static bool fwnet_frag_overlap(struct fwnet_partial_datagram *pd,
 293                               unsigned offset, unsigned len)
 294{
 295        struct fwnet_fragment_info *fi;
 296        unsigned end = offset + len;
 297
 298        list_for_each_entry(fi, &pd->fi_list, fi_link)
 299                if (offset < fi->offset + fi->len && end > fi->offset)
 300                        return true;
 301
 302        return false;
 303}
 304
 305/* Assumes that new fragment does not overlap any existing fragments */
 306static struct fwnet_fragment_info *fwnet_frag_new(
 307        struct fwnet_partial_datagram *pd, unsigned offset, unsigned len)
 308{
 309        struct fwnet_fragment_info *fi, *fi2, *new;
 310        struct list_head *list;
 311
 312        list = &pd->fi_list;
 313        list_for_each_entry(fi, &pd->fi_list, fi_link) {
 314                if (fi->offset + fi->len == offset) {
 315                        /* The new fragment can be tacked on to the end */
 316                        /* Did the new fragment plug a hole? */
 317                        fi2 = list_entry(fi->fi_link.next,
 318                                         struct fwnet_fragment_info, fi_link);
 319                        if (fi->offset + fi->len == fi2->offset) {
 320                                /* glue fragments together */
 321                                fi->len += len + fi2->len;
 322                                list_del(&fi2->fi_link);
 323                                kfree(fi2);
 324                        } else {
 325                                fi->len += len;
 326                        }
 327
 328                        return fi;
 329                }
 330                if (offset + len == fi->offset) {
 331                        /* The new fragment can be tacked on to the beginning */
 332                        /* Did the new fragment plug a hole? */
 333                        fi2 = list_entry(fi->fi_link.prev,
 334                                         struct fwnet_fragment_info, fi_link);
 335                        if (fi2->offset + fi2->len == fi->offset) {
 336                                /* glue fragments together */
 337                                fi2->len += fi->len + len;
 338                                list_del(&fi->fi_link);
 339                                kfree(fi);
 340
 341                                return fi2;
 342                        }
 343                        fi->offset = offset;
 344                        fi->len += len;
 345
 346                        return fi;
 347                }
 348                if (offset > fi->offset + fi->len) {
 349                        list = &fi->fi_link;
 350                        break;
 351                }
 352                if (offset + len < fi->offset) {
 353                        list = fi->fi_link.prev;
 354                        break;
 355                }
 356        }
 357
 358        new = kmalloc(sizeof(*new), GFP_ATOMIC);
 359        if (!new)
 360                return NULL;
 361
 362        new->offset = offset;
 363        new->len = len;
 364        list_add(&new->fi_link, list);
 365
 366        return new;
 367}
 368
 369static struct fwnet_partial_datagram *fwnet_pd_new(struct net_device *net,
 370                struct fwnet_peer *peer, u16 datagram_label, unsigned dg_size,
 371                void *frag_buf, unsigned frag_off, unsigned frag_len)
 372{
 373        struct fwnet_partial_datagram *new;
 374        struct fwnet_fragment_info *fi;
 375
 376        new = kmalloc(sizeof(*new), GFP_ATOMIC);
 377        if (!new)
 378                goto fail;
 379
 380        INIT_LIST_HEAD(&new->fi_list);
 381        fi = fwnet_frag_new(new, frag_off, frag_len);
 382        if (fi == NULL)
 383                goto fail_w_new;
 384
 385        new->datagram_label = datagram_label;
 386        new->datagram_size = dg_size;
 387        new->skb = dev_alloc_skb(dg_size + LL_RESERVED_SPACE(net));
 388        if (new->skb == NULL)
 389                goto fail_w_fi;
 390
 391        skb_reserve(new->skb, LL_RESERVED_SPACE(net));
 392        new->pbuf = skb_put(new->skb, dg_size);
 393        memcpy(new->pbuf + frag_off, frag_buf, frag_len);
 394        list_add_tail(&new->pd_link, &peer->pd_list);
 395
 396        return new;
 397
 398fail_w_fi:
 399        kfree(fi);
 400fail_w_new:
 401        kfree(new);
 402fail:
 403        return NULL;
 404}
 405
 406static struct fwnet_partial_datagram *fwnet_pd_find(struct fwnet_peer *peer,
 407                                                    u16 datagram_label)
 408{
 409        struct fwnet_partial_datagram *pd;
 410
 411        list_for_each_entry(pd, &peer->pd_list, pd_link)
 412                if (pd->datagram_label == datagram_label)
 413                        return pd;
 414
 415        return NULL;
 416}
 417
 418
 419static void fwnet_pd_delete(struct fwnet_partial_datagram *old)
 420{
 421        struct fwnet_fragment_info *fi, *n;
 422
 423        list_for_each_entry_safe(fi, n, &old->fi_list, fi_link)
 424                kfree(fi);
 425
 426        list_del(&old->pd_link);
 427        dev_kfree_skb_any(old->skb);
 428        kfree(old);
 429}
 430
 431static bool fwnet_pd_update(struct fwnet_peer *peer,
 432                struct fwnet_partial_datagram *pd, void *frag_buf,
 433                unsigned frag_off, unsigned frag_len)
 434{
 435        if (fwnet_frag_new(pd, frag_off, frag_len) == NULL)
 436                return false;
 437
 438        memcpy(pd->pbuf + frag_off, frag_buf, frag_len);
 439
 440        /*
 441         * Move list entry to beginning of list so that oldest partial
 442         * datagrams percolate to the end of the list
 443         */
 444        list_move_tail(&pd->pd_link, &peer->pd_list);
 445
 446        return true;
 447}
 448
 449static bool fwnet_pd_is_complete(struct fwnet_partial_datagram *pd)
 450{
 451        struct fwnet_fragment_info *fi;
 452
 453        fi = list_entry(pd->fi_list.next, struct fwnet_fragment_info, fi_link);
 454
 455        return fi->len == pd->datagram_size;
 456}
 457
 458/* caller must hold dev->lock */
 459static struct fwnet_peer *fwnet_peer_find_by_guid(struct fwnet_device *dev,
 460                                                  u64 guid)
 461{
 462        struct fwnet_peer *peer;
 463
 464        list_for_each_entry(peer, &dev->peer_list, peer_link)
 465                if (peer->guid == guid)
 466                        return peer;
 467
 468        return NULL;
 469}
 470
 471/* caller must hold dev->lock */
 472static struct fwnet_peer *fwnet_peer_find_by_node_id(struct fwnet_device *dev,
 473                                                int node_id, int generation)
 474{
 475        struct fwnet_peer *peer;
 476
 477        list_for_each_entry(peer, &dev->peer_list, peer_link)
 478                if (peer->node_id    == node_id &&
 479                    peer->generation == generation)
 480                        return peer;
 481
 482        return NULL;
 483}
 484
 485/* See IEEE 1394-2008 table 6-4, table 8-8, table 16-18. */
 486static unsigned fwnet_max_payload(unsigned max_rec, unsigned speed)
 487{
 488        max_rec = min(max_rec, speed + 8);
 489        max_rec = clamp(max_rec, 8U, 11U); /* 512...4096 */
 490
 491        return (1 << (max_rec + 1)) - RFC2374_FRAG_HDR_SIZE;
 492}
 493
 494
 495static int fwnet_finish_incoming_packet(struct net_device *net,
 496                                        struct sk_buff *skb, u16 source_node_id,
 497                                        bool is_broadcast, u16 ether_type)
 498{
 499        struct fwnet_device *dev;
 500        int status;
 501        __be64 guid;
 502
 503        switch (ether_type) {
 504        case ETH_P_ARP:
 505        case ETH_P_IP:
 506#if IS_ENABLED(CONFIG_IPV6)
 507        case ETH_P_IPV6:
 508#endif
 509                break;
 510        default:
 511                goto err;
 512        }
 513
 514        dev = netdev_priv(net);
 515        /* Write metadata, and then pass to the receive level */
 516        skb->dev = net;
 517        skb->ip_summed = CHECKSUM_NONE;
 518
 519        /*
 520         * Parse the encapsulation header. This actually does the job of
 521         * converting to an ethernet-like pseudo frame header.
 522         */
 523        guid = cpu_to_be64(dev->card->guid);
 524        if (dev_hard_header(skb, net, ether_type,
 525                           is_broadcast ? net->broadcast : net->dev_addr,
 526                           NULL, skb->len) >= 0) {
 527                struct fwnet_header *eth;
 528                u16 *rawp;
 529                __be16 protocol;
 530
 531                skb_reset_mac_header(skb);
 532                skb_pull(skb, sizeof(*eth));
 533                eth = (struct fwnet_header *)skb_mac_header(skb);
 534                if (fwnet_hwaddr_is_multicast(eth->h_dest)) {
 535                        if (memcmp(eth->h_dest, net->broadcast,
 536                                   net->addr_len) == 0)
 537                                skb->pkt_type = PACKET_BROADCAST;
 538#if 0
 539                        else
 540                                skb->pkt_type = PACKET_MULTICAST;
 541#endif
 542                } else {
 543                        if (memcmp(eth->h_dest, net->dev_addr, net->addr_len))
 544                                skb->pkt_type = PACKET_OTHERHOST;
 545                }
 546                if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN) {
 547                        protocol = eth->h_proto;
 548                } else {
 549                        rawp = (u16 *)skb->data;
 550                        if (*rawp == 0xffff)
 551                                protocol = htons(ETH_P_802_3);
 552                        else
 553                                protocol = htons(ETH_P_802_2);
 554                }
 555                skb->protocol = protocol;
 556        }
 557        status = netif_rx(skb);
 558        if (status == NET_RX_DROP) {
 559                net->stats.rx_errors++;
 560                net->stats.rx_dropped++;
 561        } else {
 562                net->stats.rx_packets++;
 563                net->stats.rx_bytes += skb->len;
 564        }
 565
 566        return 0;
 567
 568 err:
 569        net->stats.rx_errors++;
 570        net->stats.rx_dropped++;
 571
 572        dev_kfree_skb_any(skb);
 573
 574        return -ENOENT;
 575}
 576
 577static int fwnet_incoming_packet(struct fwnet_device *dev, __be32 *buf, int len,
 578                                 int source_node_id, int generation,
 579                                 bool is_broadcast)
 580{
 581        struct sk_buff *skb;
 582        struct net_device *net = dev->netdev;
 583        struct rfc2734_header hdr;
 584        unsigned lf;
 585        unsigned long flags;
 586        struct fwnet_peer *peer;
 587        struct fwnet_partial_datagram *pd;
 588        int fg_off;
 589        int dg_size;
 590        u16 datagram_label;
 591        int retval;
 592        u16 ether_type;
 593
 594        hdr.w0 = be32_to_cpu(buf[0]);
 595        lf = fwnet_get_hdr_lf(&hdr);
 596        if (lf == RFC2374_HDR_UNFRAG) {
 597                /*
 598                 * An unfragmented datagram has been received by the ieee1394
 599                 * bus. Build an skbuff around it so we can pass it to the
 600                 * high level network layer.
 601                 */
 602                ether_type = fwnet_get_hdr_ether_type(&hdr);
 603                buf++;
 604                len -= RFC2374_UNFRAG_HDR_SIZE;
 605
 606                skb = dev_alloc_skb(len + LL_RESERVED_SPACE(net));
 607                if (unlikely(!skb)) {
 608                        net->stats.rx_dropped++;
 609
 610                        return -ENOMEM;
 611                }
 612                skb_reserve(skb, LL_RESERVED_SPACE(net));
 613                memcpy(skb_put(skb, len), buf, len);
 614
 615                return fwnet_finish_incoming_packet(net, skb, source_node_id,
 616                                                    is_broadcast, ether_type);
 617        }
 618        /* A datagram fragment has been received, now the fun begins. */
 619        hdr.w1 = ntohl(buf[1]);
 620        buf += 2;
 621        len -= RFC2374_FRAG_HDR_SIZE;
 622        if (lf == RFC2374_HDR_FIRSTFRAG) {
 623                ether_type = fwnet_get_hdr_ether_type(&hdr);
 624                fg_off = 0;
 625        } else {
 626                ether_type = 0;
 627                fg_off = fwnet_get_hdr_fg_off(&hdr);
 628        }
 629        datagram_label = fwnet_get_hdr_dgl(&hdr);
 630        dg_size = fwnet_get_hdr_dg_size(&hdr); /* ??? + 1 */
 631
 632        spin_lock_irqsave(&dev->lock, flags);
 633
 634        peer = fwnet_peer_find_by_node_id(dev, source_node_id, generation);
 635        if (!peer) {
 636                retval = -ENOENT;
 637                goto fail;
 638        }
 639
 640        pd = fwnet_pd_find(peer, datagram_label);
 641        if (pd == NULL) {
 642                while (peer->pdg_size >= FWNET_MAX_FRAGMENTS) {
 643                        /* remove the oldest */
 644                        fwnet_pd_delete(list_first_entry(&peer->pd_list,
 645                                struct fwnet_partial_datagram, pd_link));
 646                        peer->pdg_size--;
 647                }
 648                pd = fwnet_pd_new(net, peer, datagram_label,
 649                                  dg_size, buf, fg_off, len);
 650                if (pd == NULL) {
 651                        retval = -ENOMEM;
 652                        goto fail;
 653                }
 654                peer->pdg_size++;
 655        } else {
 656                if (fwnet_frag_overlap(pd, fg_off, len) ||
 657                    pd->datagram_size != dg_size) {
 658                        /*
 659                         * Differing datagram sizes or overlapping fragments,
 660                         * discard old datagram and start a new one.
 661                         */
 662                        fwnet_pd_delete(pd);
 663                        pd = fwnet_pd_new(net, peer, datagram_label,
 664                                          dg_size, buf, fg_off, len);
 665                        if (pd == NULL) {
 666                                peer->pdg_size--;
 667                                retval = -ENOMEM;
 668                                goto fail;
 669                        }
 670                } else {
 671                        if (!fwnet_pd_update(peer, pd, buf, fg_off, len)) {
 672                                /*
 673                                 * Couldn't save off fragment anyway
 674                                 * so might as well obliterate the
 675                                 * datagram now.
 676                                 */
 677                                fwnet_pd_delete(pd);
 678                                peer->pdg_size--;
 679                                retval = -ENOMEM;
 680                                goto fail;
 681                        }
 682                }
 683        } /* new datagram or add to existing one */
 684
 685        if (lf == RFC2374_HDR_FIRSTFRAG)
 686                pd->ether_type = ether_type;
 687
 688        if (fwnet_pd_is_complete(pd)) {
 689                ether_type = pd->ether_type;
 690                peer->pdg_size--;
 691                skb = skb_get(pd->skb);
 692                fwnet_pd_delete(pd);
 693
 694                spin_unlock_irqrestore(&dev->lock, flags);
 695
 696                return fwnet_finish_incoming_packet(net, skb, source_node_id,
 697                                                    false, ether_type);
 698        }
 699        /*
 700         * Datagram is not complete, we're done for the
 701         * moment.
 702         */
 703        retval = 0;
 704 fail:
 705        spin_unlock_irqrestore(&dev->lock, flags);
 706
 707        return retval;
 708}
 709
 710static void fwnet_receive_packet(struct fw_card *card, struct fw_request *r,
 711                int tcode, int destination, int source, int generation,
 712                unsigned long long offset, void *payload, size_t length,
 713                void *callback_data)
 714{
 715        struct fwnet_device *dev = callback_data;
 716        int rcode;
 717
 718        if (destination == IEEE1394_ALL_NODES) {
 719                kfree(r);
 720
 721                return;
 722        }
 723
 724        if (offset != dev->handler.offset)
 725                rcode = RCODE_ADDRESS_ERROR;
 726        else if (tcode != TCODE_WRITE_BLOCK_REQUEST)
 727                rcode = RCODE_TYPE_ERROR;
 728        else if (fwnet_incoming_packet(dev, payload, length,
 729                                       source, generation, false) != 0) {
 730                dev_err(&dev->netdev->dev, "incoming packet failure\n");
 731                rcode = RCODE_CONFLICT_ERROR;
 732        } else
 733                rcode = RCODE_COMPLETE;
 734
 735        fw_send_response(card, r, rcode);
 736}
 737
 738static void fwnet_receive_broadcast(struct fw_iso_context *context,
 739                u32 cycle, size_t header_length, void *header, void *data)
 740{
 741        struct fwnet_device *dev;
 742        struct fw_iso_packet packet;
 743        __be16 *hdr_ptr;
 744        __be32 *buf_ptr;
 745        int retval;
 746        u32 length;
 747        u16 source_node_id;
 748        u32 specifier_id;
 749        u32 ver;
 750        unsigned long offset;
 751        unsigned long flags;
 752
 753        dev = data;
 754        hdr_ptr = header;
 755        length = be16_to_cpup(hdr_ptr);
 756
 757        spin_lock_irqsave(&dev->lock, flags);
 758
 759        offset = dev->rcv_buffer_size * dev->broadcast_rcv_next_ptr;
 760        buf_ptr = dev->broadcast_rcv_buffer_ptrs[dev->broadcast_rcv_next_ptr++];
 761        if (dev->broadcast_rcv_next_ptr == dev->num_broadcast_rcv_ptrs)
 762                dev->broadcast_rcv_next_ptr = 0;
 763
 764        spin_unlock_irqrestore(&dev->lock, flags);
 765
 766        specifier_id =    (be32_to_cpu(buf_ptr[0]) & 0xffff) << 8
 767                        | (be32_to_cpu(buf_ptr[1]) & 0xff000000) >> 24;
 768        ver = be32_to_cpu(buf_ptr[1]) & 0xffffff;
 769        source_node_id = be32_to_cpu(buf_ptr[0]) >> 16;
 770
 771        if (specifier_id == IANA_SPECIFIER_ID &&
 772            (ver == RFC2734_SW_VERSION
 773#if IS_ENABLED(CONFIG_IPV6)
 774             || ver == RFC3146_SW_VERSION
 775#endif
 776            )) {
 777                buf_ptr += 2;
 778                length -= IEEE1394_GASP_HDR_SIZE;
 779                fwnet_incoming_packet(dev, buf_ptr, length, source_node_id,
 780                                      context->card->generation, true);
 781        }
 782
 783        packet.payload_length = dev->rcv_buffer_size;
 784        packet.interrupt = 1;
 785        packet.skip = 0;
 786        packet.tag = 3;
 787        packet.sy = 0;
 788        packet.header_length = IEEE1394_GASP_HDR_SIZE;
 789
 790        spin_lock_irqsave(&dev->lock, flags);
 791
 792        retval = fw_iso_context_queue(dev->broadcast_rcv_context, &packet,
 793                                      &dev->broadcast_rcv_buffer, offset);
 794
 795        spin_unlock_irqrestore(&dev->lock, flags);
 796
 797        if (retval >= 0)
 798                fw_iso_context_queue_flush(dev->broadcast_rcv_context);
 799        else
 800                dev_err(&dev->netdev->dev, "requeue failed\n");
 801}
 802
 803static struct kmem_cache *fwnet_packet_task_cache;
 804
 805static void fwnet_free_ptask(struct fwnet_packet_task *ptask)
 806{
 807        dev_kfree_skb_any(ptask->skb);
 808        kmem_cache_free(fwnet_packet_task_cache, ptask);
 809}
 810
 811/* Caller must hold dev->lock. */
 812static void dec_queued_datagrams(struct fwnet_device *dev)
 813{
 814        if (--dev->queued_datagrams == FWNET_MIN_QUEUED_DATAGRAMS)
 815                netif_wake_queue(dev->netdev);
 816}
 817
 818static int fwnet_send_packet(struct fwnet_packet_task *ptask);
 819
 820static void fwnet_transmit_packet_done(struct fwnet_packet_task *ptask)
 821{
 822        struct fwnet_device *dev = ptask->dev;
 823        struct sk_buff *skb = ptask->skb;
 824        unsigned long flags;
 825        bool free;
 826
 827        spin_lock_irqsave(&dev->lock, flags);
 828
 829        ptask->outstanding_pkts--;
 830
 831        /* Check whether we or the networking TX soft-IRQ is last user. */
 832        free = (ptask->outstanding_pkts == 0 && ptask->enqueued);
 833        if (free)
 834                dec_queued_datagrams(dev);
 835
 836        if (ptask->outstanding_pkts == 0) {
 837                dev->netdev->stats.tx_packets++;
 838                dev->netdev->stats.tx_bytes += skb->len;
 839        }
 840
 841        spin_unlock_irqrestore(&dev->lock, flags);
 842
 843        if (ptask->outstanding_pkts > 0) {
 844                u16 dg_size;
 845                u16 fg_off;
 846                u16 datagram_label;
 847                u16 lf;
 848
 849                /* Update the ptask to point to the next fragment and send it */
 850                lf = fwnet_get_hdr_lf(&ptask->hdr);
 851                switch (lf) {
 852                case RFC2374_HDR_LASTFRAG:
 853                case RFC2374_HDR_UNFRAG:
 854                default:
 855                        dev_err(&dev->netdev->dev,
 856                                "outstanding packet %x lf %x, header %x,%x\n",
 857                                ptask->outstanding_pkts, lf, ptask->hdr.w0,
 858                                ptask->hdr.w1);
 859                        BUG();
 860
 861                case RFC2374_HDR_FIRSTFRAG:
 862                        /* Set frag type here for future interior fragments */
 863                        dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
 864                        fg_off = ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
 865                        datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
 866                        break;
 867
 868                case RFC2374_HDR_INTFRAG:
 869                        dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
 870                        fg_off = fwnet_get_hdr_fg_off(&ptask->hdr)
 871                                  + ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
 872                        datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
 873                        break;
 874                }
 875
 876                if (ptask->dest_node == IEEE1394_ALL_NODES) {
 877                        skb_pull(skb,
 878                                 ptask->max_payload + IEEE1394_GASP_HDR_SIZE);
 879                } else {
 880                        skb_pull(skb, ptask->max_payload);
 881                }
 882                if (ptask->outstanding_pkts > 1) {
 883                        fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_INTFRAG,
 884                                          dg_size, fg_off, datagram_label);
 885                } else {
 886                        fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_LASTFRAG,
 887                                          dg_size, fg_off, datagram_label);
 888                        ptask->max_payload = skb->len + RFC2374_FRAG_HDR_SIZE;
 889                }
 890                fwnet_send_packet(ptask);
 891        }
 892
 893        if (free)
 894                fwnet_free_ptask(ptask);
 895}
 896
 897static void fwnet_transmit_packet_failed(struct fwnet_packet_task *ptask)
 898{
 899        struct fwnet_device *dev = ptask->dev;
 900        unsigned long flags;
 901        bool free;
 902
 903        spin_lock_irqsave(&dev->lock, flags);
 904
 905        /* One fragment failed; don't try to send remaining fragments. */
 906        ptask->outstanding_pkts = 0;
 907
 908        /* Check whether we or the networking TX soft-IRQ is last user. */
 909        free = ptask->enqueued;
 910        if (free)
 911                dec_queued_datagrams(dev);
 912
 913        dev->netdev->stats.tx_dropped++;
 914        dev->netdev->stats.tx_errors++;
 915
 916        spin_unlock_irqrestore(&dev->lock, flags);
 917
 918        if (free)
 919                fwnet_free_ptask(ptask);
 920}
 921
 922static void fwnet_write_complete(struct fw_card *card, int rcode,
 923                                 void *payload, size_t length, void *data)
 924{
 925        struct fwnet_packet_task *ptask = data;
 926        static unsigned long j;
 927        static int last_rcode, errors_skipped;
 928
 929        if (rcode == RCODE_COMPLETE) {
 930                fwnet_transmit_packet_done(ptask);
 931        } else {
 932                fwnet_transmit_packet_failed(ptask);
 933
 934                if (printk_timed_ratelimit(&j,  1000) || rcode != last_rcode) {
 935                        dev_err(&ptask->dev->netdev->dev,
 936                                "fwnet_write_complete failed: %x (skipped %d)\n",
 937                                rcode, errors_skipped);
 938
 939                        errors_skipped = 0;
 940                        last_rcode = rcode;
 941                } else
 942                        errors_skipped++;
 943        }
 944}
 945
 946static int fwnet_send_packet(struct fwnet_packet_task *ptask)
 947{
 948        struct fwnet_device *dev;
 949        unsigned tx_len;
 950        struct rfc2734_header *bufhdr;
 951        unsigned long flags;
 952        bool free;
 953
 954        dev = ptask->dev;
 955        tx_len = ptask->max_payload;
 956        switch (fwnet_get_hdr_lf(&ptask->hdr)) {
 957        case RFC2374_HDR_UNFRAG:
 958                bufhdr = (struct rfc2734_header *)
 959                                skb_push(ptask->skb, RFC2374_UNFRAG_HDR_SIZE);
 960                put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
 961                break;
 962
 963        case RFC2374_HDR_FIRSTFRAG:
 964        case RFC2374_HDR_INTFRAG:
 965        case RFC2374_HDR_LASTFRAG:
 966                bufhdr = (struct rfc2734_header *)
 967                                skb_push(ptask->skb, RFC2374_FRAG_HDR_SIZE);
 968                put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
 969                put_unaligned_be32(ptask->hdr.w1, &bufhdr->w1);
 970                break;
 971
 972        default:
 973                BUG();
 974        }
 975        if (ptask->dest_node == IEEE1394_ALL_NODES) {
 976                u8 *p;
 977                int generation;
 978                int node_id;
 979                unsigned int sw_version;
 980
 981                /* ptask->generation may not have been set yet */
 982                generation = dev->card->generation;
 983                smp_rmb();
 984                node_id = dev->card->node_id;
 985
 986                switch (ptask->skb->protocol) {
 987                default:
 988                        sw_version = RFC2734_SW_VERSION;
 989                        break;
 990#if IS_ENABLED(CONFIG_IPV6)
 991                case htons(ETH_P_IPV6):
 992                        sw_version = RFC3146_SW_VERSION;
 993#endif
 994                }
 995
 996                p = skb_push(ptask->skb, IEEE1394_GASP_HDR_SIZE);
 997                put_unaligned_be32(node_id << 16 | IANA_SPECIFIER_ID >> 8, p);
 998                put_unaligned_be32((IANA_SPECIFIER_ID & 0xff) << 24
 999                                                | sw_version, &p[4]);
1000
1001                /* We should not transmit if broadcast_channel.valid == 0. */
1002                fw_send_request(dev->card, &ptask->transaction,
1003                                TCODE_STREAM_DATA,
1004                                fw_stream_packet_destination_id(3,
1005                                                IEEE1394_BROADCAST_CHANNEL, 0),
1006                                generation, SCODE_100, 0ULL, ptask->skb->data,
1007                                tx_len + 8, fwnet_write_complete, ptask);
1008
1009                spin_lock_irqsave(&dev->lock, flags);
1010
1011                /* If the AT tasklet already ran, we may be last user. */
1012                free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1013                if (!free)
1014                        ptask->enqueued = true;
1015                else
1016                        dec_queued_datagrams(dev);
1017
1018                spin_unlock_irqrestore(&dev->lock, flags);
1019
1020                goto out;
1021        }
1022
1023        fw_send_request(dev->card, &ptask->transaction,
1024                        TCODE_WRITE_BLOCK_REQUEST, ptask->dest_node,
1025                        ptask->generation, ptask->speed, ptask->fifo_addr,
1026                        ptask->skb->data, tx_len, fwnet_write_complete, ptask);
1027
1028        spin_lock_irqsave(&dev->lock, flags);
1029
1030        /* If the AT tasklet already ran, we may be last user. */
1031        free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1032        if (!free)
1033                ptask->enqueued = true;
1034        else
1035                dec_queued_datagrams(dev);
1036
1037        spin_unlock_irqrestore(&dev->lock, flags);
1038
1039        dev->netdev->trans_start = jiffies;
1040 out:
1041        if (free)
1042                fwnet_free_ptask(ptask);
1043
1044        return 0;
1045}
1046
1047static void fwnet_fifo_stop(struct fwnet_device *dev)
1048{
1049        if (dev->local_fifo == FWNET_NO_FIFO_ADDR)
1050                return;
1051
1052        fw_core_remove_address_handler(&dev->handler);
1053        dev->local_fifo = FWNET_NO_FIFO_ADDR;
1054}
1055
1056static int fwnet_fifo_start(struct fwnet_device *dev)
1057{
1058        int retval;
1059
1060        if (dev->local_fifo != FWNET_NO_FIFO_ADDR)
1061                return 0;
1062
1063        dev->handler.length = 4096;
1064        dev->handler.address_callback = fwnet_receive_packet;
1065        dev->handler.callback_data = dev;
1066
1067        retval = fw_core_add_address_handler(&dev->handler,
1068                                             &fw_high_memory_region);
1069        if (retval < 0)
1070                return retval;
1071
1072        dev->local_fifo = dev->handler.offset;
1073
1074        return 0;
1075}
1076
1077static void __fwnet_broadcast_stop(struct fwnet_device *dev)
1078{
1079        unsigned u;
1080
1081        if (dev->broadcast_state != FWNET_BROADCAST_ERROR) {
1082                for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++)
1083                        kunmap(dev->broadcast_rcv_buffer.pages[u]);
1084                fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer, dev->card);
1085        }
1086        if (dev->broadcast_rcv_context) {
1087                fw_iso_context_destroy(dev->broadcast_rcv_context);
1088                dev->broadcast_rcv_context = NULL;
1089        }
1090        kfree(dev->broadcast_rcv_buffer_ptrs);
1091        dev->broadcast_rcv_buffer_ptrs = NULL;
1092        dev->broadcast_state = FWNET_BROADCAST_ERROR;
1093}
1094
1095static void fwnet_broadcast_stop(struct fwnet_device *dev)
1096{
1097        if (dev->broadcast_state == FWNET_BROADCAST_ERROR)
1098                return;
1099        fw_iso_context_stop(dev->broadcast_rcv_context);
1100        __fwnet_broadcast_stop(dev);
1101}
1102
1103static int fwnet_broadcast_start(struct fwnet_device *dev)
1104{
1105        struct fw_iso_context *context;
1106        int retval;
1107        unsigned num_packets;
1108        unsigned max_receive;
1109        struct fw_iso_packet packet;
1110        unsigned long offset;
1111        void **ptrptr;
1112        unsigned u;
1113
1114        if (dev->broadcast_state != FWNET_BROADCAST_ERROR)
1115                return 0;
1116
1117        max_receive = 1U << (dev->card->max_receive + 1);
1118        num_packets = (FWNET_ISO_PAGE_COUNT * PAGE_SIZE) / max_receive;
1119
1120        ptrptr = kmalloc(sizeof(void *) * num_packets, GFP_KERNEL);
1121        if (!ptrptr) {
1122                retval = -ENOMEM;
1123                goto failed;
1124        }
1125        dev->broadcast_rcv_buffer_ptrs = ptrptr;
1126
1127        context = fw_iso_context_create(dev->card, FW_ISO_CONTEXT_RECEIVE,
1128                                        IEEE1394_BROADCAST_CHANNEL,
1129                                        dev->card->link_speed, 8,
1130                                        fwnet_receive_broadcast, dev);
1131        if (IS_ERR(context)) {
1132                retval = PTR_ERR(context);
1133                goto failed;
1134        }
1135
1136        retval = fw_iso_buffer_init(&dev->broadcast_rcv_buffer, dev->card,
1137                                    FWNET_ISO_PAGE_COUNT, DMA_FROM_DEVICE);
1138        if (retval < 0)
1139                goto failed;
1140
1141        dev->broadcast_state = FWNET_BROADCAST_STOPPED;
1142
1143        for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++) {
1144                void *ptr;
1145                unsigned v;
1146
1147                ptr = kmap(dev->broadcast_rcv_buffer.pages[u]);
1148                for (v = 0; v < num_packets / FWNET_ISO_PAGE_COUNT; v++)
1149                        *ptrptr++ = (void *) ((char *)ptr + v * max_receive);
1150        }
1151        dev->broadcast_rcv_context = context;
1152
1153        packet.payload_length = max_receive;
1154        packet.interrupt = 1;
1155        packet.skip = 0;
1156        packet.tag = 3;
1157        packet.sy = 0;
1158        packet.header_length = IEEE1394_GASP_HDR_SIZE;
1159        offset = 0;
1160
1161        for (u = 0; u < num_packets; u++) {
1162                retval = fw_iso_context_queue(context, &packet,
1163                                &dev->broadcast_rcv_buffer, offset);
1164                if (retval < 0)
1165                        goto failed;
1166
1167                offset += max_receive;
1168        }
1169        dev->num_broadcast_rcv_ptrs = num_packets;
1170        dev->rcv_buffer_size = max_receive;
1171        dev->broadcast_rcv_next_ptr = 0U;
1172        retval = fw_iso_context_start(context, -1, 0,
1173                        FW_ISO_CONTEXT_MATCH_ALL_TAGS); /* ??? sync */
1174        if (retval < 0)
1175                goto failed;
1176
1177        /* FIXME: adjust it according to the min. speed of all known peers? */
1178        dev->broadcast_xmt_max_payload = IEEE1394_MAX_PAYLOAD_S100
1179                        - IEEE1394_GASP_HDR_SIZE - RFC2374_UNFRAG_HDR_SIZE;
1180        dev->broadcast_state = FWNET_BROADCAST_RUNNING;
1181
1182        return 0;
1183
1184 failed:
1185        __fwnet_broadcast_stop(dev);
1186        return retval;
1187}
1188
1189static void set_carrier_state(struct fwnet_device *dev)
1190{
1191        if (dev->peer_count > 1)
1192                netif_carrier_on(dev->netdev);
1193        else
1194                netif_carrier_off(dev->netdev);
1195}
1196
1197/* ifup */
1198static int fwnet_open(struct net_device *net)
1199{
1200        struct fwnet_device *dev = netdev_priv(net);
1201        int ret;
1202
1203        ret = fwnet_broadcast_start(dev);
1204        if (ret)
1205                return ret;
1206
1207        netif_start_queue(net);
1208
1209        spin_lock_irq(&dev->lock);
1210        set_carrier_state(dev);
1211        spin_unlock_irq(&dev->lock);
1212
1213        return 0;
1214}
1215
1216/* ifdown */
1217static int fwnet_stop(struct net_device *net)
1218{
1219        struct fwnet_device *dev = netdev_priv(net);
1220
1221        netif_stop_queue(net);
1222        fwnet_broadcast_stop(dev);
1223
1224        return 0;
1225}
1226
1227static netdev_tx_t fwnet_tx(struct sk_buff *skb, struct net_device *net)
1228{
1229        struct fwnet_header hdr_buf;
1230        struct fwnet_device *dev = netdev_priv(net);
1231        __be16 proto;
1232        u16 dest_node;
1233        unsigned max_payload;
1234        u16 dg_size;
1235        u16 *datagram_label_ptr;
1236        struct fwnet_packet_task *ptask;
1237        struct fwnet_peer *peer;
1238        unsigned long flags;
1239
1240        spin_lock_irqsave(&dev->lock, flags);
1241
1242        /* Can this happen? */
1243        if (netif_queue_stopped(dev->netdev)) {
1244                spin_unlock_irqrestore(&dev->lock, flags);
1245
1246                return NETDEV_TX_BUSY;
1247        }
1248
1249        ptask = kmem_cache_alloc(fwnet_packet_task_cache, GFP_ATOMIC);
1250        if (ptask == NULL)
1251                goto fail;
1252
1253        skb = skb_share_check(skb, GFP_ATOMIC);
1254        if (!skb)
1255                goto fail;
1256
1257        /*
1258         * Make a copy of the driver-specific header.
1259         * We might need to rebuild the header on tx failure.
1260         */
1261        memcpy(&hdr_buf, skb->data, sizeof(hdr_buf));
1262        proto = hdr_buf.h_proto;
1263
1264        switch (proto) {
1265        case htons(ETH_P_ARP):
1266        case htons(ETH_P_IP):
1267#if IS_ENABLED(CONFIG_IPV6)
1268        case htons(ETH_P_IPV6):
1269#endif
1270                break;
1271        default:
1272                goto fail;
1273        }
1274
1275        skb_pull(skb, sizeof(hdr_buf));
1276        dg_size = skb->len;
1277
1278        /*
1279         * Set the transmission type for the packet.  ARP packets and IP
1280         * broadcast packets are sent via GASP.
1281         */
1282        if (fwnet_hwaddr_is_multicast(hdr_buf.h_dest)) {
1283                max_payload        = dev->broadcast_xmt_max_payload;
1284                datagram_label_ptr = &dev->broadcast_xmt_datagramlabel;
1285
1286                ptask->fifo_addr   = FWNET_NO_FIFO_ADDR;
1287                ptask->generation  = 0;
1288                ptask->dest_node   = IEEE1394_ALL_NODES;
1289                ptask->speed       = SCODE_100;
1290        } else {
1291                union fwnet_hwaddr *ha = (union fwnet_hwaddr *)hdr_buf.h_dest;
1292                __be64 guid = get_unaligned(&ha->uc.uniq_id);
1293                u8 generation;
1294
1295                peer = fwnet_peer_find_by_guid(dev, be64_to_cpu(guid));
1296                if (!peer)
1297                        goto fail;
1298
1299                generation         = peer->generation;
1300                dest_node          = peer->node_id;
1301                max_payload        = peer->max_payload;
1302                datagram_label_ptr = &peer->datagram_label;
1303
1304                ptask->fifo_addr   = fwnet_hwaddr_fifo(ha);
1305                ptask->generation  = generation;
1306                ptask->dest_node   = dest_node;
1307                ptask->speed       = peer->speed;
1308        }
1309
1310        ptask->hdr.w0 = 0;
1311        ptask->hdr.w1 = 0;
1312        ptask->skb = skb;
1313        ptask->dev = dev;
1314
1315        /* Does it all fit in one packet? */
1316        if (dg_size <= max_payload) {
1317                fwnet_make_uf_hdr(&ptask->hdr, ntohs(proto));
1318                ptask->outstanding_pkts = 1;
1319                max_payload = dg_size + RFC2374_UNFRAG_HDR_SIZE;
1320        } else {
1321                u16 datagram_label;
1322
1323                max_payload -= RFC2374_FRAG_OVERHEAD;
1324                datagram_label = (*datagram_label_ptr)++;
1325                fwnet_make_ff_hdr(&ptask->hdr, ntohs(proto), dg_size,
1326                                  datagram_label);
1327                ptask->outstanding_pkts = DIV_ROUND_UP(dg_size, max_payload);
1328                max_payload += RFC2374_FRAG_HDR_SIZE;
1329        }
1330
1331        if (++dev->queued_datagrams == FWNET_MAX_QUEUED_DATAGRAMS)
1332                netif_stop_queue(dev->netdev);
1333
1334        spin_unlock_irqrestore(&dev->lock, flags);
1335
1336        ptask->max_payload = max_payload;
1337        ptask->enqueued    = 0;
1338
1339        fwnet_send_packet(ptask);
1340
1341        return NETDEV_TX_OK;
1342
1343 fail:
1344        spin_unlock_irqrestore(&dev->lock, flags);
1345
1346        if (ptask)
1347                kmem_cache_free(fwnet_packet_task_cache, ptask);
1348
1349        if (skb != NULL)
1350                dev_kfree_skb(skb);
1351
1352        net->stats.tx_dropped++;
1353        net->stats.tx_errors++;
1354
1355        /*
1356         * FIXME: According to a patch from 2003-02-26, "returning non-zero
1357         * causes serious problems" here, allegedly.  Before that patch,
1358         * -ERRNO was returned which is not appropriate under Linux 2.6.
1359         * Perhaps more needs to be done?  Stop the queue in serious
1360         * conditions and restart it elsewhere?
1361         */
1362        return NETDEV_TX_OK;
1363}
1364
1365static int fwnet_change_mtu(struct net_device *net, int new_mtu)
1366{
1367        if (new_mtu < 68)
1368                return -EINVAL;
1369
1370        net->mtu = new_mtu;
1371        return 0;
1372}
1373
1374static const struct ethtool_ops fwnet_ethtool_ops = {
1375        .get_link       = ethtool_op_get_link,
1376};
1377
1378static const struct net_device_ops fwnet_netdev_ops = {
1379        .ndo_open       = fwnet_open,
1380        .ndo_stop       = fwnet_stop,
1381        .ndo_start_xmit = fwnet_tx,
1382        .ndo_change_mtu = fwnet_change_mtu,
1383};
1384
1385static void fwnet_init_dev(struct net_device *net)
1386{
1387        net->header_ops         = &fwnet_header_ops;
1388        net->netdev_ops         = &fwnet_netdev_ops;
1389        net->watchdog_timeo     = 2 * HZ;
1390        net->flags              = IFF_BROADCAST | IFF_MULTICAST;
1391        net->features           = NETIF_F_HIGHDMA;
1392        net->addr_len           = FWNET_ALEN;
1393        net->hard_header_len    = FWNET_HLEN;
1394        net->type               = ARPHRD_IEEE1394;
1395        net->tx_queue_len       = FWNET_TX_QUEUE_LEN;
1396        net->ethtool_ops        = &fwnet_ethtool_ops;
1397}
1398
1399/* caller must hold fwnet_device_mutex */
1400static struct fwnet_device *fwnet_dev_find(struct fw_card *card)
1401{
1402        struct fwnet_device *dev;
1403
1404        list_for_each_entry(dev, &fwnet_device_list, dev_link)
1405                if (dev->card == card)
1406                        return dev;
1407
1408        return NULL;
1409}
1410
1411static int fwnet_add_peer(struct fwnet_device *dev,
1412                          struct fw_unit *unit, struct fw_device *device)
1413{
1414        struct fwnet_peer *peer;
1415
1416        peer = kmalloc(sizeof(*peer), GFP_KERNEL);
1417        if (!peer)
1418                return -ENOMEM;
1419
1420        dev_set_drvdata(&unit->device, peer);
1421
1422        peer->dev = dev;
1423        peer->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4];
1424        INIT_LIST_HEAD(&peer->pd_list);
1425        peer->pdg_size = 0;
1426        peer->datagram_label = 0;
1427        peer->speed = device->max_speed;
1428        peer->max_payload = fwnet_max_payload(device->max_rec, peer->speed);
1429
1430        peer->generation = device->generation;
1431        smp_rmb();
1432        peer->node_id = device->node_id;
1433
1434        spin_lock_irq(&dev->lock);
1435        list_add_tail(&peer->peer_link, &dev->peer_list);
1436        dev->peer_count++;
1437        set_carrier_state(dev);
1438        spin_unlock_irq(&dev->lock);
1439
1440        return 0;
1441}
1442
1443static int fwnet_probe(struct device *_dev)
1444{
1445        struct fw_unit *unit = fw_unit(_dev);
1446        struct fw_device *device = fw_parent_device(unit);
1447        struct fw_card *card = device->card;
1448        struct net_device *net;
1449        bool allocated_netdev = false;
1450        struct fwnet_device *dev;
1451        unsigned max_mtu;
1452        int ret;
1453        union fwnet_hwaddr *ha;
1454
1455        mutex_lock(&fwnet_device_mutex);
1456
1457        dev = fwnet_dev_find(card);
1458        if (dev) {
1459                net = dev->netdev;
1460                goto have_dev;
1461        }
1462
1463        net = alloc_netdev(sizeof(*dev), "firewire%d", fwnet_init_dev);
1464        if (net == NULL) {
1465                ret = -ENOMEM;
1466                goto out;
1467        }
1468
1469        allocated_netdev = true;
1470        SET_NETDEV_DEV(net, card->device);
1471        dev = netdev_priv(net);
1472
1473        spin_lock_init(&dev->lock);
1474        dev->broadcast_state = FWNET_BROADCAST_ERROR;
1475        dev->broadcast_rcv_context = NULL;
1476        dev->broadcast_xmt_max_payload = 0;
1477        dev->broadcast_xmt_datagramlabel = 0;
1478        dev->local_fifo = FWNET_NO_FIFO_ADDR;
1479        dev->queued_datagrams = 0;
1480        INIT_LIST_HEAD(&dev->peer_list);
1481        dev->card = card;
1482        dev->netdev = net;
1483
1484        ret = fwnet_fifo_start(dev);
1485        if (ret < 0)
1486                goto out;
1487        dev->local_fifo = dev->handler.offset;
1488
1489        /*
1490         * Use the RFC 2734 default 1500 octets or the maximum payload
1491         * as initial MTU
1492         */
1493        max_mtu = (1 << (card->max_receive + 1))
1494                  - sizeof(struct rfc2734_header) - IEEE1394_GASP_HDR_SIZE;
1495        net->mtu = min(1500U, max_mtu);
1496
1497        /* Set our hardware address while we're at it */
1498        ha = (union fwnet_hwaddr *)net->dev_addr;
1499        put_unaligned_be64(card->guid, &ha->uc.uniq_id);
1500        ha->uc.max_rec = dev->card->max_receive;
1501        ha->uc.sspd = dev->card->link_speed;
1502        put_unaligned_be16(dev->local_fifo >> 32, &ha->uc.fifo_hi);
1503        put_unaligned_be32(dev->local_fifo & 0xffffffff, &ha->uc.fifo_lo);
1504
1505        memset(net->broadcast, -1, net->addr_len);
1506
1507        ret = register_netdev(net);
1508        if (ret)
1509                goto out;
1510
1511        list_add_tail(&dev->dev_link, &fwnet_device_list);
1512        dev_notice(&net->dev, "IP over IEEE 1394 on card %s\n",
1513                   dev_name(card->device));
1514 have_dev:
1515        ret = fwnet_add_peer(dev, unit, device);
1516        if (ret && allocated_netdev) {
1517                unregister_netdev(net);
1518                list_del(&dev->dev_link);
1519 out:
1520                fwnet_fifo_stop(dev);
1521                free_netdev(net);
1522        }
1523
1524        mutex_unlock(&fwnet_device_mutex);
1525
1526        return ret;
1527}
1528
1529static void fwnet_remove_peer(struct fwnet_peer *peer, struct fwnet_device *dev)
1530{
1531        struct fwnet_partial_datagram *pd, *pd_next;
1532
1533        spin_lock_irq(&dev->lock);
1534        list_del(&peer->peer_link);
1535        dev->peer_count--;
1536        set_carrier_state(dev);
1537        spin_unlock_irq(&dev->lock);
1538
1539        list_for_each_entry_safe(pd, pd_next, &peer->pd_list, pd_link)
1540                fwnet_pd_delete(pd);
1541
1542        kfree(peer);
1543}
1544
1545static int fwnet_remove(struct device *_dev)
1546{
1547        struct fwnet_peer *peer = dev_get_drvdata(_dev);
1548        struct fwnet_device *dev = peer->dev;
1549        struct net_device *net;
1550        int i;
1551
1552        mutex_lock(&fwnet_device_mutex);
1553
1554        net = dev->netdev;
1555
1556        fwnet_remove_peer(peer, dev);
1557
1558        if (list_empty(&dev->peer_list)) {
1559                unregister_netdev(net);
1560
1561                fwnet_fifo_stop(dev);
1562
1563                for (i = 0; dev->queued_datagrams && i < 5; i++)
1564                        ssleep(1);
1565                WARN_ON(dev->queued_datagrams);
1566                list_del(&dev->dev_link);
1567
1568                free_netdev(net);
1569        }
1570
1571        mutex_unlock(&fwnet_device_mutex);
1572
1573        return 0;
1574}
1575
1576/*
1577 * FIXME abort partially sent fragmented datagrams,
1578 * discard partially received fragmented datagrams
1579 */
1580static void fwnet_update(struct fw_unit *unit)
1581{
1582        struct fw_device *device = fw_parent_device(unit);
1583        struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1584        int generation;
1585
1586        generation = device->generation;
1587
1588        spin_lock_irq(&peer->dev->lock);
1589        peer->node_id    = device->node_id;
1590        peer->generation = generation;
1591        spin_unlock_irq(&peer->dev->lock);
1592}
1593
1594static const struct ieee1394_device_id fwnet_id_table[] = {
1595        {
1596                .match_flags  = IEEE1394_MATCH_SPECIFIER_ID |
1597                                IEEE1394_MATCH_VERSION,
1598                .specifier_id = IANA_SPECIFIER_ID,
1599                .version      = RFC2734_SW_VERSION,
1600        },
1601#if IS_ENABLED(CONFIG_IPV6)
1602        {
1603                .match_flags  = IEEE1394_MATCH_SPECIFIER_ID |
1604                                IEEE1394_MATCH_VERSION,
1605                .specifier_id = IANA_SPECIFIER_ID,
1606                .version      = RFC3146_SW_VERSION,
1607        },
1608#endif
1609        { }
1610};
1611
1612static struct fw_driver fwnet_driver = {
1613        .driver = {
1614                .owner  = THIS_MODULE,
1615                .name   = KBUILD_MODNAME,
1616                .bus    = &fw_bus_type,
1617                .probe  = fwnet_probe,
1618                .remove = fwnet_remove,
1619        },
1620        .update   = fwnet_update,
1621        .id_table = fwnet_id_table,
1622};
1623
1624static const u32 rfc2374_unit_directory_data[] = {
1625        0x00040000,     /* directory_length             */
1626        0x1200005e,     /* unit_specifier_id: IANA      */
1627        0x81000003,     /* textual descriptor offset    */
1628        0x13000001,     /* unit_sw_version: RFC 2734    */
1629        0x81000005,     /* textual descriptor offset    */
1630        0x00030000,     /* descriptor_length            */
1631        0x00000000,     /* text                         */
1632        0x00000000,     /* minimal ASCII, en            */
1633        0x49414e41,     /* I A N A                      */
1634        0x00030000,     /* descriptor_length            */
1635        0x00000000,     /* text                         */
1636        0x00000000,     /* minimal ASCII, en            */
1637        0x49507634,     /* I P v 4                      */
1638};
1639
1640static struct fw_descriptor rfc2374_unit_directory = {
1641        .length = ARRAY_SIZE(rfc2374_unit_directory_data),
1642        .key    = (CSR_DIRECTORY | CSR_UNIT) << 24,
1643        .data   = rfc2374_unit_directory_data
1644};
1645
1646#if IS_ENABLED(CONFIG_IPV6)
1647static const u32 rfc3146_unit_directory_data[] = {
1648        0x00040000,     /* directory_length             */
1649        0x1200005e,     /* unit_specifier_id: IANA      */
1650        0x81000003,     /* textual descriptor offset    */
1651        0x13000002,     /* unit_sw_version: RFC 3146    */
1652        0x81000005,     /* textual descriptor offset    */
1653        0x00030000,     /* descriptor_length            */
1654        0x00000000,     /* text                         */
1655        0x00000000,     /* minimal ASCII, en            */
1656        0x49414e41,     /* I A N A                      */
1657        0x00030000,     /* descriptor_length            */
1658        0x00000000,     /* text                         */
1659        0x00000000,     /* minimal ASCII, en            */
1660        0x49507636,     /* I P v 6                      */
1661};
1662
1663static struct fw_descriptor rfc3146_unit_directory = {
1664        .length = ARRAY_SIZE(rfc3146_unit_directory_data),
1665        .key    = (CSR_DIRECTORY | CSR_UNIT) << 24,
1666        .data   = rfc3146_unit_directory_data
1667};
1668#endif
1669
1670static int __init fwnet_init(void)
1671{
1672        int err;
1673
1674        err = fw_core_add_descriptor(&rfc2374_unit_directory);
1675        if (err)
1676                return err;
1677
1678#if IS_ENABLED(CONFIG_IPV6)
1679        err = fw_core_add_descriptor(&rfc3146_unit_directory);
1680        if (err)
1681                goto out;
1682#endif
1683
1684        fwnet_packet_task_cache = kmem_cache_create("packet_task",
1685                        sizeof(struct fwnet_packet_task), 0, 0, NULL);
1686        if (!fwnet_packet_task_cache) {
1687                err = -ENOMEM;
1688                goto out2;
1689        }
1690
1691        err = driver_register(&fwnet_driver.driver);
1692        if (!err)
1693                return 0;
1694
1695        kmem_cache_destroy(fwnet_packet_task_cache);
1696out2:
1697#if IS_ENABLED(CONFIG_IPV6)
1698        fw_core_remove_descriptor(&rfc3146_unit_directory);
1699out:
1700#endif
1701        fw_core_remove_descriptor(&rfc2374_unit_directory);
1702
1703        return err;
1704}
1705module_init(fwnet_init);
1706
1707static void __exit fwnet_cleanup(void)
1708{
1709        driver_unregister(&fwnet_driver.driver);
1710        kmem_cache_destroy(fwnet_packet_task_cache);
1711#if IS_ENABLED(CONFIG_IPV6)
1712        fw_core_remove_descriptor(&rfc3146_unit_directory);
1713#endif
1714        fw_core_remove_descriptor(&rfc2374_unit_directory);
1715}
1716module_exit(fwnet_cleanup);
1717
1718MODULE_AUTHOR("Jay Fenlason <fenlason@redhat.com>");
1719MODULE_DESCRIPTION("IP over IEEE1394 as per RFC 2734/3146");
1720MODULE_LICENSE("GPL");
1721MODULE_DEVICE_TABLE(ieee1394, fwnet_id_table);
1722
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