linux/drivers/firewire/net.c
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   1/*
   2 * IPv4 over IEEE 1394, per RFC 2734
   3 *
   4 * Copyright (C) 2009 Jay Fenlason <fenlason@redhat.com>
   5 *
   6 * based on eth1394 by Ben Collins et al
   7 */
   8
   9#include <linux/bug.h>
  10#include <linux/compiler.h>
  11#include <linux/delay.h>
  12#include <linux/device.h>
  13#include <linux/ethtool.h>
  14#include <linux/firewire.h>
  15#include <linux/firewire-constants.h>
  16#include <linux/highmem.h>
  17#include <linux/in.h>
  18#include <linux/ip.h>
  19#include <linux/jiffies.h>
  20#include <linux/mod_devicetable.h>
  21#include <linux/module.h>
  22#include <linux/moduleparam.h>
  23#include <linux/mutex.h>
  24#include <linux/netdevice.h>
  25#include <linux/skbuff.h>
  26#include <linux/slab.h>
  27#include <linux/spinlock.h>
  28
  29#include <asm/unaligned.h>
  30#include <net/arp.h>
  31
  32/* rx limits */
  33#define FWNET_MAX_FRAGMENTS             30 /* arbitrary, > TX queue depth */
  34#define FWNET_ISO_PAGE_COUNT            (PAGE_SIZE < 16*1024 ? 4 : 2)
  35
  36/* tx limits */
  37#define FWNET_MAX_QUEUED_DATAGRAMS      20 /* < 64 = number of tlabels */
  38#define FWNET_MIN_QUEUED_DATAGRAMS      10 /* should keep AT DMA busy enough */
  39#define FWNET_TX_QUEUE_LEN              FWNET_MAX_QUEUED_DATAGRAMS /* ? */
  40
  41#define IEEE1394_BROADCAST_CHANNEL      31
  42#define IEEE1394_ALL_NODES              (0xffc0 | 0x003f)
  43#define IEEE1394_MAX_PAYLOAD_S100       512
  44#define FWNET_NO_FIFO_ADDR              (~0ULL)
  45
  46#define IANA_SPECIFIER_ID               0x00005eU
  47#define RFC2734_SW_VERSION              0x000001U
  48
  49#define IEEE1394_GASP_HDR_SIZE  8
  50
  51#define RFC2374_UNFRAG_HDR_SIZE 4
  52#define RFC2374_FRAG_HDR_SIZE   8
  53#define RFC2374_FRAG_OVERHEAD   4
  54
  55#define RFC2374_HDR_UNFRAG      0       /* unfragmented         */
  56#define RFC2374_HDR_FIRSTFRAG   1       /* first fragment       */
  57#define RFC2374_HDR_LASTFRAG    2       /* last fragment        */
  58#define RFC2374_HDR_INTFRAG     3       /* interior fragment    */
  59
  60#define RFC2734_HW_ADDR_LEN     16
  61
  62struct rfc2734_arp {
  63        __be16 hw_type;         /* 0x0018       */
  64        __be16 proto_type;      /* 0x0806       */
  65        u8 hw_addr_len;         /* 16           */
  66        u8 ip_addr_len;         /* 4            */
  67        __be16 opcode;          /* ARP Opcode   */
  68        /* Above is exactly the same format as struct arphdr */
  69
  70        __be64 s_uniq_id;       /* Sender's 64bit EUI                   */
  71        u8 max_rec;             /* Sender's max packet size             */
  72        u8 sspd;                /* Sender's max speed                   */
  73        __be16 fifo_hi;         /* hi 16bits of sender's FIFO addr      */
  74        __be32 fifo_lo;         /* lo 32bits of sender's FIFO addr      */
  75        __be32 sip;             /* Sender's IP Address                  */
  76        __be32 tip;             /* IP Address of requested hw addr      */
  77} __packed;
  78
  79/* This header format is specific to this driver implementation. */
  80#define FWNET_ALEN      8
  81#define FWNET_HLEN      10
  82struct fwnet_header {
  83        u8 h_dest[FWNET_ALEN];  /* destination address */
  84        __be16 h_proto;         /* packet type ID field */
  85} __packed;
  86
  87/* IPv4 and IPv6 encapsulation header */
  88struct rfc2734_header {
  89        u32 w0;
  90        u32 w1;
  91};
  92
  93#define fwnet_get_hdr_lf(h)             (((h)->w0 & 0xc0000000) >> 30)
  94#define fwnet_get_hdr_ether_type(h)     (((h)->w0 & 0x0000ffff))
  95#define fwnet_get_hdr_dg_size(h)        (((h)->w0 & 0x0fff0000) >> 16)
  96#define fwnet_get_hdr_fg_off(h)         (((h)->w0 & 0x00000fff))
  97#define fwnet_get_hdr_dgl(h)            (((h)->w1 & 0xffff0000) >> 16)
  98
  99#define fwnet_set_hdr_lf(lf)            ((lf)  << 30)
 100#define fwnet_set_hdr_ether_type(et)    (et)
 101#define fwnet_set_hdr_dg_size(dgs)      ((dgs) << 16)
 102#define fwnet_set_hdr_fg_off(fgo)       (fgo)
 103
 104#define fwnet_set_hdr_dgl(dgl)          ((dgl) << 16)
 105
 106static inline void fwnet_make_uf_hdr(struct rfc2734_header *hdr,
 107                unsigned ether_type)
 108{
 109        hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_UNFRAG)
 110                  | fwnet_set_hdr_ether_type(ether_type);
 111}
 112
 113static inline void fwnet_make_ff_hdr(struct rfc2734_header *hdr,
 114                unsigned ether_type, unsigned dg_size, unsigned dgl)
 115{
 116        hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_FIRSTFRAG)
 117                  | fwnet_set_hdr_dg_size(dg_size)
 118                  | fwnet_set_hdr_ether_type(ether_type);
 119        hdr->w1 = fwnet_set_hdr_dgl(dgl);
 120}
 121
 122static inline void fwnet_make_sf_hdr(struct rfc2734_header *hdr,
 123                unsigned lf, unsigned dg_size, unsigned fg_off, unsigned dgl)
 124{
 125        hdr->w0 = fwnet_set_hdr_lf(lf)
 126                  | fwnet_set_hdr_dg_size(dg_size)
 127                  | fwnet_set_hdr_fg_off(fg_off);
 128        hdr->w1 = fwnet_set_hdr_dgl(dgl);
 129}
 130
 131/* This list keeps track of what parts of the datagram have been filled in */
 132struct fwnet_fragment_info {
 133        struct list_head fi_link;
 134        u16 offset;
 135        u16 len;
 136};
 137
 138struct fwnet_partial_datagram {
 139        struct list_head pd_link;
 140        struct list_head fi_list;
 141        struct sk_buff *skb;
 142        /* FIXME Why not use skb->data? */
 143        char *pbuf;
 144        u16 datagram_label;
 145        u16 ether_type;
 146        u16 datagram_size;
 147};
 148
 149static DEFINE_MUTEX(fwnet_device_mutex);
 150static LIST_HEAD(fwnet_device_list);
 151
 152struct fwnet_device {
 153        struct list_head dev_link;
 154        spinlock_t lock;
 155        enum {
 156                FWNET_BROADCAST_ERROR,
 157                FWNET_BROADCAST_RUNNING,
 158                FWNET_BROADCAST_STOPPED,
 159        } broadcast_state;
 160        struct fw_iso_context *broadcast_rcv_context;
 161        struct fw_iso_buffer broadcast_rcv_buffer;
 162        void **broadcast_rcv_buffer_ptrs;
 163        unsigned broadcast_rcv_next_ptr;
 164        unsigned num_broadcast_rcv_ptrs;
 165        unsigned rcv_buffer_size;
 166        /*
 167         * This value is the maximum unfragmented datagram size that can be
 168         * sent by the hardware.  It already has the GASP overhead and the
 169         * unfragmented datagram header overhead calculated into it.
 170         */
 171        unsigned broadcast_xmt_max_payload;
 172        u16 broadcast_xmt_datagramlabel;
 173
 174        /*
 175         * The CSR address that remote nodes must send datagrams to for us to
 176         * receive them.
 177         */
 178        struct fw_address_handler handler;
 179        u64 local_fifo;
 180
 181        /* Number of tx datagrams that have been queued but not yet acked */
 182        int queued_datagrams;
 183
 184        int peer_count;
 185        struct list_head peer_list;
 186        struct fw_card *card;
 187        struct net_device *netdev;
 188};
 189
 190struct fwnet_peer {
 191        struct list_head peer_link;
 192        struct fwnet_device *dev;
 193        u64 guid;
 194        u64 fifo;
 195        __be32 ip;
 196
 197        /* guarded by dev->lock */
 198        struct list_head pd_list; /* received partial datagrams */
 199        unsigned pdg_size;        /* pd_list size */
 200
 201        u16 datagram_label;       /* outgoing datagram label */
 202        u16 max_payload;          /* includes RFC2374_FRAG_HDR_SIZE overhead */
 203        int node_id;
 204        int generation;
 205        unsigned speed;
 206};
 207
 208/* This is our task struct. It's used for the packet complete callback.  */
 209struct fwnet_packet_task {
 210        struct fw_transaction transaction;
 211        struct rfc2734_header hdr;
 212        struct sk_buff *skb;
 213        struct fwnet_device *dev;
 214
 215        int outstanding_pkts;
 216        u64 fifo_addr;
 217        u16 dest_node;
 218        u16 max_payload;
 219        u8 generation;
 220        u8 speed;
 221        u8 enqueued;
 222};
 223
 224/*
 225 * saddr == NULL means use device source address.
 226 * daddr == NULL means leave destination address (eg unresolved arp).
 227 */
 228static int fwnet_header_create(struct sk_buff *skb, struct net_device *net,
 229                        unsigned short type, const void *daddr,
 230                        const void *saddr, unsigned len)
 231{
 232        struct fwnet_header *h;
 233
 234        h = (struct fwnet_header *)skb_push(skb, sizeof(*h));
 235        put_unaligned_be16(type, &h->h_proto);
 236
 237        if (net->flags & (IFF_LOOPBACK | IFF_NOARP)) {
 238                memset(h->h_dest, 0, net->addr_len);
 239
 240                return net->hard_header_len;
 241        }
 242
 243        if (daddr) {
 244                memcpy(h->h_dest, daddr, net->addr_len);
 245
 246                return net->hard_header_len;
 247        }
 248
 249        return -net->hard_header_len;
 250}
 251
 252static int fwnet_header_rebuild(struct sk_buff *skb)
 253{
 254        struct fwnet_header *h = (struct fwnet_header *)skb->data;
 255
 256        if (get_unaligned_be16(&h->h_proto) == ETH_P_IP)
 257                return arp_find((unsigned char *)&h->h_dest, skb);
 258
 259        dev_notice(&skb->dev->dev, "unable to resolve type %04x addresses\n",
 260                   be16_to_cpu(h->h_proto));
 261        return 0;
 262}
 263
 264static int fwnet_header_cache(const struct neighbour *neigh,
 265                              struct hh_cache *hh, __be16 type)
 266{
 267        struct net_device *net;
 268        struct fwnet_header *h;
 269
 270        if (type == cpu_to_be16(ETH_P_802_3))
 271                return -1;
 272        net = neigh->dev;
 273        h = (struct fwnet_header *)((u8 *)hh->hh_data + HH_DATA_OFF(sizeof(*h)));
 274        h->h_proto = type;
 275        memcpy(h->h_dest, neigh->ha, net->addr_len);
 276        hh->hh_len = FWNET_HLEN;
 277
 278        return 0;
 279}
 280
 281/* Called by Address Resolution module to notify changes in address. */
 282static void fwnet_header_cache_update(struct hh_cache *hh,
 283                const struct net_device *net, const unsigned char *haddr)
 284{
 285        memcpy((u8 *)hh->hh_data + HH_DATA_OFF(FWNET_HLEN), haddr, net->addr_len);
 286}
 287
 288static int fwnet_header_parse(const struct sk_buff *skb, unsigned char *haddr)
 289{
 290        memcpy(haddr, skb->dev->dev_addr, FWNET_ALEN);
 291
 292        return FWNET_ALEN;
 293}
 294
 295static const struct header_ops fwnet_header_ops = {
 296        .create         = fwnet_header_create,
 297        .rebuild        = fwnet_header_rebuild,
 298        .cache          = fwnet_header_cache,
 299        .cache_update   = fwnet_header_cache_update,
 300        .parse          = fwnet_header_parse,
 301};
 302
 303/* FIXME: is this correct for all cases? */
 304static bool fwnet_frag_overlap(struct fwnet_partial_datagram *pd,
 305                               unsigned offset, unsigned len)
 306{
 307        struct fwnet_fragment_info *fi;
 308        unsigned end = offset + len;
 309
 310        list_for_each_entry(fi, &pd->fi_list, fi_link)
 311                if (offset < fi->offset + fi->len && end > fi->offset)
 312                        return true;
 313
 314        return false;
 315}
 316
 317/* Assumes that new fragment does not overlap any existing fragments */
 318static struct fwnet_fragment_info *fwnet_frag_new(
 319        struct fwnet_partial_datagram *pd, unsigned offset, unsigned len)
 320{
 321        struct fwnet_fragment_info *fi, *fi2, *new;
 322        struct list_head *list;
 323
 324        list = &pd->fi_list;
 325        list_for_each_entry(fi, &pd->fi_list, fi_link) {
 326                if (fi->offset + fi->len == offset) {
 327                        /* The new fragment can be tacked on to the end */
 328                        /* Did the new fragment plug a hole? */
 329                        fi2 = list_entry(fi->fi_link.next,
 330                                         struct fwnet_fragment_info, fi_link);
 331                        if (fi->offset + fi->len == fi2->offset) {
 332                                /* glue fragments together */
 333                                fi->len += len + fi2->len;
 334                                list_del(&fi2->fi_link);
 335                                kfree(fi2);
 336                        } else {
 337                                fi->len += len;
 338                        }
 339
 340                        return fi;
 341                }
 342                if (offset + len == fi->offset) {
 343                        /* The new fragment can be tacked on to the beginning */
 344                        /* Did the new fragment plug a hole? */
 345                        fi2 = list_entry(fi->fi_link.prev,
 346                                         struct fwnet_fragment_info, fi_link);
 347                        if (fi2->offset + fi2->len == fi->offset) {
 348                                /* glue fragments together */
 349                                fi2->len += fi->len + len;
 350                                list_del(&fi->fi_link);
 351                                kfree(fi);
 352
 353                                return fi2;
 354                        }
 355                        fi->offset = offset;
 356                        fi->len += len;
 357
 358                        return fi;
 359                }
 360                if (offset > fi->offset + fi->len) {
 361                        list = &fi->fi_link;
 362                        break;
 363                }
 364                if (offset + len < fi->offset) {
 365                        list = fi->fi_link.prev;
 366                        break;
 367                }
 368        }
 369
 370        new = kmalloc(sizeof(*new), GFP_ATOMIC);
 371        if (!new) {
 372                dev_err(&pd->skb->dev->dev, "out of memory\n");
 373                return NULL;
 374        }
 375
 376        new->offset = offset;
 377        new->len = len;
 378        list_add(&new->fi_link, list);
 379
 380        return new;
 381}
 382
 383static struct fwnet_partial_datagram *fwnet_pd_new(struct net_device *net,
 384                struct fwnet_peer *peer, u16 datagram_label, unsigned dg_size,
 385                void *frag_buf, unsigned frag_off, unsigned frag_len)
 386{
 387        struct fwnet_partial_datagram *new;
 388        struct fwnet_fragment_info *fi;
 389
 390        new = kmalloc(sizeof(*new), GFP_ATOMIC);
 391        if (!new)
 392                goto fail;
 393
 394        INIT_LIST_HEAD(&new->fi_list);
 395        fi = fwnet_frag_new(new, frag_off, frag_len);
 396        if (fi == NULL)
 397                goto fail_w_new;
 398
 399        new->datagram_label = datagram_label;
 400        new->datagram_size = dg_size;
 401        new->skb = dev_alloc_skb(dg_size + LL_RESERVED_SPACE(net));
 402        if (new->skb == NULL)
 403                goto fail_w_fi;
 404
 405        skb_reserve(new->skb, LL_RESERVED_SPACE(net));
 406        new->pbuf = skb_put(new->skb, dg_size);
 407        memcpy(new->pbuf + frag_off, frag_buf, frag_len);
 408        list_add_tail(&new->pd_link, &peer->pd_list);
 409
 410        return new;
 411
 412fail_w_fi:
 413        kfree(fi);
 414fail_w_new:
 415        kfree(new);
 416fail:
 417        dev_err(&net->dev, "out of memory\n");
 418
 419        return NULL;
 420}
 421
 422static struct fwnet_partial_datagram *fwnet_pd_find(struct fwnet_peer *peer,
 423                                                    u16 datagram_label)
 424{
 425        struct fwnet_partial_datagram *pd;
 426
 427        list_for_each_entry(pd, &peer->pd_list, pd_link)
 428                if (pd->datagram_label == datagram_label)
 429                        return pd;
 430
 431        return NULL;
 432}
 433
 434
 435static void fwnet_pd_delete(struct fwnet_partial_datagram *old)
 436{
 437        struct fwnet_fragment_info *fi, *n;
 438
 439        list_for_each_entry_safe(fi, n, &old->fi_list, fi_link)
 440                kfree(fi);
 441
 442        list_del(&old->pd_link);
 443        dev_kfree_skb_any(old->skb);
 444        kfree(old);
 445}
 446
 447static bool fwnet_pd_update(struct fwnet_peer *peer,
 448                struct fwnet_partial_datagram *pd, void *frag_buf,
 449                unsigned frag_off, unsigned frag_len)
 450{
 451        if (fwnet_frag_new(pd, frag_off, frag_len) == NULL)
 452                return false;
 453
 454        memcpy(pd->pbuf + frag_off, frag_buf, frag_len);
 455
 456        /*
 457         * Move list entry to beginning of list so that oldest partial
 458         * datagrams percolate to the end of the list
 459         */
 460        list_move_tail(&pd->pd_link, &peer->pd_list);
 461
 462        return true;
 463}
 464
 465static bool fwnet_pd_is_complete(struct fwnet_partial_datagram *pd)
 466{
 467        struct fwnet_fragment_info *fi;
 468
 469        fi = list_entry(pd->fi_list.next, struct fwnet_fragment_info, fi_link);
 470
 471        return fi->len == pd->datagram_size;
 472}
 473
 474/* caller must hold dev->lock */
 475static struct fwnet_peer *fwnet_peer_find_by_guid(struct fwnet_device *dev,
 476                                                  u64 guid)
 477{
 478        struct fwnet_peer *peer;
 479
 480        list_for_each_entry(peer, &dev->peer_list, peer_link)
 481                if (peer->guid == guid)
 482                        return peer;
 483
 484        return NULL;
 485}
 486
 487/* caller must hold dev->lock */
 488static struct fwnet_peer *fwnet_peer_find_by_node_id(struct fwnet_device *dev,
 489                                                int node_id, int generation)
 490{
 491        struct fwnet_peer *peer;
 492
 493        list_for_each_entry(peer, &dev->peer_list, peer_link)
 494                if (peer->node_id    == node_id &&
 495                    peer->generation == generation)
 496                        return peer;
 497
 498        return NULL;
 499}
 500
 501/* See IEEE 1394-2008 table 6-4, table 8-8, table 16-18. */
 502static unsigned fwnet_max_payload(unsigned max_rec, unsigned speed)
 503{
 504        max_rec = min(max_rec, speed + 8);
 505        max_rec = clamp(max_rec, 8U, 11U); /* 512...4096 */
 506
 507        return (1 << (max_rec + 1)) - RFC2374_FRAG_HDR_SIZE;
 508}
 509
 510
 511static int fwnet_finish_incoming_packet(struct net_device *net,
 512                                        struct sk_buff *skb, u16 source_node_id,
 513                                        bool is_broadcast, u16 ether_type)
 514{
 515        struct fwnet_device *dev;
 516        static const __be64 broadcast_hw = cpu_to_be64(~0ULL);
 517        int status;
 518        __be64 guid;
 519
 520        dev = netdev_priv(net);
 521        /* Write metadata, and then pass to the receive level */
 522        skb->dev = net;
 523        skb->ip_summed = CHECKSUM_NONE;
 524
 525        /*
 526         * Parse the encapsulation header. This actually does the job of
 527         * converting to an ethernet frame header, as well as arp
 528         * conversion if needed. ARP conversion is easier in this
 529         * direction, since we are using ethernet as our backend.
 530         */
 531        /*
 532         * If this is an ARP packet, convert it. First, we want to make
 533         * use of some of the fields, since they tell us a little bit
 534         * about the sending machine.
 535         */
 536        if (ether_type == ETH_P_ARP) {
 537                struct rfc2734_arp *arp1394;
 538                struct arphdr *arp;
 539                unsigned char *arp_ptr;
 540                u64 fifo_addr;
 541                u64 peer_guid;
 542                unsigned sspd;
 543                u16 max_payload;
 544                struct fwnet_peer *peer;
 545                unsigned long flags;
 546
 547                arp1394   = (struct rfc2734_arp *)skb->data;
 548                arp       = (struct arphdr *)skb->data;
 549                arp_ptr   = (unsigned char *)(arp + 1);
 550                peer_guid = get_unaligned_be64(&arp1394->s_uniq_id);
 551                fifo_addr = (u64)get_unaligned_be16(&arp1394->fifo_hi) << 32
 552                                | get_unaligned_be32(&arp1394->fifo_lo);
 553
 554                sspd = arp1394->sspd;
 555                /* Sanity check.  OS X 10.3 PPC reportedly sends 131. */
 556                if (sspd > SCODE_3200) {
 557                        dev_notice(&net->dev, "sspd %x out of range\n", sspd);
 558                        sspd = SCODE_3200;
 559                }
 560                max_payload = fwnet_max_payload(arp1394->max_rec, sspd);
 561
 562                spin_lock_irqsave(&dev->lock, flags);
 563                peer = fwnet_peer_find_by_guid(dev, peer_guid);
 564                if (peer) {
 565                        peer->fifo = fifo_addr;
 566
 567                        if (peer->speed > sspd)
 568                                peer->speed = sspd;
 569                        if (peer->max_payload > max_payload)
 570                                peer->max_payload = max_payload;
 571
 572                        peer->ip = arp1394->sip;
 573                }
 574                spin_unlock_irqrestore(&dev->lock, flags);
 575
 576                if (!peer) {
 577                        dev_notice(&net->dev,
 578                                   "no peer for ARP packet from %016llx\n",
 579                                   (unsigned long long)peer_guid);
 580                        goto no_peer;
 581                }
 582
 583                /*
 584                 * Now that we're done with the 1394 specific stuff, we'll
 585                 * need to alter some of the data.  Believe it or not, all
 586                 * that needs to be done is sender_IP_address needs to be
 587                 * moved, the destination hardware address get stuffed
 588                 * in and the hardware address length set to 8.
 589                 *
 590                 * IMPORTANT: The code below overwrites 1394 specific data
 591                 * needed above so keep the munging of the data for the
 592                 * higher level IP stack last.
 593                 */
 594
 595                arp->ar_hln = 8;
 596                /* skip over sender unique id */
 597                arp_ptr += arp->ar_hln;
 598                /* move sender IP addr */
 599                put_unaligned(arp1394->sip, (u32 *)arp_ptr);
 600                /* skip over sender IP addr */
 601                arp_ptr += arp->ar_pln;
 602
 603                if (arp->ar_op == htons(ARPOP_REQUEST))
 604                        memset(arp_ptr, 0, sizeof(u64));
 605                else
 606                        memcpy(arp_ptr, net->dev_addr, sizeof(u64));
 607        }
 608
 609        /* Now add the ethernet header. */
 610        guid = cpu_to_be64(dev->card->guid);
 611        if (dev_hard_header(skb, net, ether_type,
 612                           is_broadcast ? &broadcast_hw : &guid,
 613                           NULL, skb->len) >= 0) {
 614                struct fwnet_header *eth;
 615                u16 *rawp;
 616                __be16 protocol;
 617
 618                skb_reset_mac_header(skb);
 619                skb_pull(skb, sizeof(*eth));
 620                eth = (struct fwnet_header *)skb_mac_header(skb);
 621                if (*eth->h_dest & 1) {
 622                        if (memcmp(eth->h_dest, net->broadcast,
 623                                   net->addr_len) == 0)
 624                                skb->pkt_type = PACKET_BROADCAST;
 625#if 0
 626                        else
 627                                skb->pkt_type = PACKET_MULTICAST;
 628#endif
 629                } else {
 630                        if (memcmp(eth->h_dest, net->dev_addr, net->addr_len))
 631                                skb->pkt_type = PACKET_OTHERHOST;
 632                }
 633                if (ntohs(eth->h_proto) >= 1536) {
 634                        protocol = eth->h_proto;
 635                } else {
 636                        rawp = (u16 *)skb->data;
 637                        if (*rawp == 0xffff)
 638                                protocol = htons(ETH_P_802_3);
 639                        else
 640                                protocol = htons(ETH_P_802_2);
 641                }
 642                skb->protocol = protocol;
 643        }
 644        status = netif_rx(skb);
 645        if (status == NET_RX_DROP) {
 646                net->stats.rx_errors++;
 647                net->stats.rx_dropped++;
 648        } else {
 649                net->stats.rx_packets++;
 650                net->stats.rx_bytes += skb->len;
 651        }
 652
 653        return 0;
 654
 655 no_peer:
 656        net->stats.rx_errors++;
 657        net->stats.rx_dropped++;
 658
 659        dev_kfree_skb_any(skb);
 660
 661        return -ENOENT;
 662}
 663
 664static int fwnet_incoming_packet(struct fwnet_device *dev, __be32 *buf, int len,
 665                                 int source_node_id, int generation,
 666                                 bool is_broadcast)
 667{
 668        struct sk_buff *skb;
 669        struct net_device *net = dev->netdev;
 670        struct rfc2734_header hdr;
 671        unsigned lf;
 672        unsigned long flags;
 673        struct fwnet_peer *peer;
 674        struct fwnet_partial_datagram *pd;
 675        int fg_off;
 676        int dg_size;
 677        u16 datagram_label;
 678        int retval;
 679        u16 ether_type;
 680
 681        hdr.w0 = be32_to_cpu(buf[0]);
 682        lf = fwnet_get_hdr_lf(&hdr);
 683        if (lf == RFC2374_HDR_UNFRAG) {
 684                /*
 685                 * An unfragmented datagram has been received by the ieee1394
 686                 * bus. Build an skbuff around it so we can pass it to the
 687                 * high level network layer.
 688                 */
 689                ether_type = fwnet_get_hdr_ether_type(&hdr);
 690                buf++;
 691                len -= RFC2374_UNFRAG_HDR_SIZE;
 692
 693                skb = dev_alloc_skb(len + LL_RESERVED_SPACE(net));
 694                if (unlikely(!skb)) {
 695                        dev_err(&net->dev, "out of memory\n");
 696                        net->stats.rx_dropped++;
 697
 698                        return -ENOMEM;
 699                }
 700                skb_reserve(skb, LL_RESERVED_SPACE(net));
 701                memcpy(skb_put(skb, len), buf, len);
 702
 703                return fwnet_finish_incoming_packet(net, skb, source_node_id,
 704                                                    is_broadcast, ether_type);
 705        }
 706        /* A datagram fragment has been received, now the fun begins. */
 707        hdr.w1 = ntohl(buf[1]);
 708        buf += 2;
 709        len -= RFC2374_FRAG_HDR_SIZE;
 710        if (lf == RFC2374_HDR_FIRSTFRAG) {
 711                ether_type = fwnet_get_hdr_ether_type(&hdr);
 712                fg_off = 0;
 713        } else {
 714                ether_type = 0;
 715                fg_off = fwnet_get_hdr_fg_off(&hdr);
 716        }
 717        datagram_label = fwnet_get_hdr_dgl(&hdr);
 718        dg_size = fwnet_get_hdr_dg_size(&hdr); /* ??? + 1 */
 719
 720        spin_lock_irqsave(&dev->lock, flags);
 721
 722        peer = fwnet_peer_find_by_node_id(dev, source_node_id, generation);
 723        if (!peer) {
 724                retval = -ENOENT;
 725                goto fail;
 726        }
 727
 728        pd = fwnet_pd_find(peer, datagram_label);
 729        if (pd == NULL) {
 730                while (peer->pdg_size >= FWNET_MAX_FRAGMENTS) {
 731                        /* remove the oldest */
 732                        fwnet_pd_delete(list_first_entry(&peer->pd_list,
 733                                struct fwnet_partial_datagram, pd_link));
 734                        peer->pdg_size--;
 735                }
 736                pd = fwnet_pd_new(net, peer, datagram_label,
 737                                  dg_size, buf, fg_off, len);
 738                if (pd == NULL) {
 739                        retval = -ENOMEM;
 740                        goto fail;
 741                }
 742                peer->pdg_size++;
 743        } else {
 744                if (fwnet_frag_overlap(pd, fg_off, len) ||
 745                    pd->datagram_size != dg_size) {
 746                        /*
 747                         * Differing datagram sizes or overlapping fragments,
 748                         * discard old datagram and start a new one.
 749                         */
 750                        fwnet_pd_delete(pd);
 751                        pd = fwnet_pd_new(net, peer, datagram_label,
 752                                          dg_size, buf, fg_off, len);
 753                        if (pd == NULL) {
 754                                peer->pdg_size--;
 755                                retval = -ENOMEM;
 756                                goto fail;
 757                        }
 758                } else {
 759                        if (!fwnet_pd_update(peer, pd, buf, fg_off, len)) {
 760                                /*
 761                                 * Couldn't save off fragment anyway
 762                                 * so might as well obliterate the
 763                                 * datagram now.
 764                                 */
 765                                fwnet_pd_delete(pd);
 766                                peer->pdg_size--;
 767                                retval = -ENOMEM;
 768                                goto fail;
 769                        }
 770                }
 771        } /* new datagram or add to existing one */
 772
 773        if (lf == RFC2374_HDR_FIRSTFRAG)
 774                pd->ether_type = ether_type;
 775
 776        if (fwnet_pd_is_complete(pd)) {
 777                ether_type = pd->ether_type;
 778                peer->pdg_size--;
 779                skb = skb_get(pd->skb);
 780                fwnet_pd_delete(pd);
 781
 782                spin_unlock_irqrestore(&dev->lock, flags);
 783
 784                return fwnet_finish_incoming_packet(net, skb, source_node_id,
 785                                                    false, ether_type);
 786        }
 787        /*
 788         * Datagram is not complete, we're done for the
 789         * moment.
 790         */
 791        retval = 0;
 792 fail:
 793        spin_unlock_irqrestore(&dev->lock, flags);
 794
 795        return retval;
 796}
 797
 798static void fwnet_receive_packet(struct fw_card *card, struct fw_request *r,
 799                int tcode, int destination, int source, int generation,
 800                unsigned long long offset, void *payload, size_t length,
 801                void *callback_data)
 802{
 803        struct fwnet_device *dev = callback_data;
 804        int rcode;
 805
 806        if (destination == IEEE1394_ALL_NODES) {
 807                kfree(r);
 808
 809                return;
 810        }
 811
 812        if (offset != dev->handler.offset)
 813                rcode = RCODE_ADDRESS_ERROR;
 814        else if (tcode != TCODE_WRITE_BLOCK_REQUEST)
 815                rcode = RCODE_TYPE_ERROR;
 816        else if (fwnet_incoming_packet(dev, payload, length,
 817                                       source, generation, false) != 0) {
 818                dev_err(&dev->netdev->dev, "incoming packet failure\n");
 819                rcode = RCODE_CONFLICT_ERROR;
 820        } else
 821                rcode = RCODE_COMPLETE;
 822
 823        fw_send_response(card, r, rcode);
 824}
 825
 826static void fwnet_receive_broadcast(struct fw_iso_context *context,
 827                u32 cycle, size_t header_length, void *header, void *data)
 828{
 829        struct fwnet_device *dev;
 830        struct fw_iso_packet packet;
 831        __be16 *hdr_ptr;
 832        __be32 *buf_ptr;
 833        int retval;
 834        u32 length;
 835        u16 source_node_id;
 836        u32 specifier_id;
 837        u32 ver;
 838        unsigned long offset;
 839        unsigned long flags;
 840
 841        dev = data;
 842        hdr_ptr = header;
 843        length = be16_to_cpup(hdr_ptr);
 844
 845        spin_lock_irqsave(&dev->lock, flags);
 846
 847        offset = dev->rcv_buffer_size * dev->broadcast_rcv_next_ptr;
 848        buf_ptr = dev->broadcast_rcv_buffer_ptrs[dev->broadcast_rcv_next_ptr++];
 849        if (dev->broadcast_rcv_next_ptr == dev->num_broadcast_rcv_ptrs)
 850                dev->broadcast_rcv_next_ptr = 0;
 851
 852        spin_unlock_irqrestore(&dev->lock, flags);
 853
 854        specifier_id =    (be32_to_cpu(buf_ptr[0]) & 0xffff) << 8
 855                        | (be32_to_cpu(buf_ptr[1]) & 0xff000000) >> 24;
 856        ver = be32_to_cpu(buf_ptr[1]) & 0xffffff;
 857        source_node_id = be32_to_cpu(buf_ptr[0]) >> 16;
 858
 859        if (specifier_id == IANA_SPECIFIER_ID && ver == RFC2734_SW_VERSION) {
 860                buf_ptr += 2;
 861                length -= IEEE1394_GASP_HDR_SIZE;
 862                fwnet_incoming_packet(dev, buf_ptr, length, source_node_id,
 863                                      context->card->generation, true);
 864        }
 865
 866        packet.payload_length = dev->rcv_buffer_size;
 867        packet.interrupt = 1;
 868        packet.skip = 0;
 869        packet.tag = 3;
 870        packet.sy = 0;
 871        packet.header_length = IEEE1394_GASP_HDR_SIZE;
 872
 873        spin_lock_irqsave(&dev->lock, flags);
 874
 875        retval = fw_iso_context_queue(dev->broadcast_rcv_context, &packet,
 876                                      &dev->broadcast_rcv_buffer, offset);
 877
 878        spin_unlock_irqrestore(&dev->lock, flags);
 879
 880        if (retval >= 0)
 881                fw_iso_context_queue_flush(dev->broadcast_rcv_context);
 882        else
 883                dev_err(&dev->netdev->dev, "requeue failed\n");
 884}
 885
 886static struct kmem_cache *fwnet_packet_task_cache;
 887
 888static void fwnet_free_ptask(struct fwnet_packet_task *ptask)
 889{
 890        dev_kfree_skb_any(ptask->skb);
 891        kmem_cache_free(fwnet_packet_task_cache, ptask);
 892}
 893
 894/* Caller must hold dev->lock. */
 895static void dec_queued_datagrams(struct fwnet_device *dev)
 896{
 897        if (--dev->queued_datagrams == FWNET_MIN_QUEUED_DATAGRAMS)
 898                netif_wake_queue(dev->netdev);
 899}
 900
 901static int fwnet_send_packet(struct fwnet_packet_task *ptask);
 902
 903static void fwnet_transmit_packet_done(struct fwnet_packet_task *ptask)
 904{
 905        struct fwnet_device *dev = ptask->dev;
 906        struct sk_buff *skb = ptask->skb;
 907        unsigned long flags;
 908        bool free;
 909
 910        spin_lock_irqsave(&dev->lock, flags);
 911
 912        ptask->outstanding_pkts--;
 913
 914        /* Check whether we or the networking TX soft-IRQ is last user. */
 915        free = (ptask->outstanding_pkts == 0 && ptask->enqueued);
 916        if (free)
 917                dec_queued_datagrams(dev);
 918
 919        if (ptask->outstanding_pkts == 0) {
 920                dev->netdev->stats.tx_packets++;
 921                dev->netdev->stats.tx_bytes += skb->len;
 922        }
 923
 924        spin_unlock_irqrestore(&dev->lock, flags);
 925
 926        if (ptask->outstanding_pkts > 0) {
 927                u16 dg_size;
 928                u16 fg_off;
 929                u16 datagram_label;
 930                u16 lf;
 931
 932                /* Update the ptask to point to the next fragment and send it */
 933                lf = fwnet_get_hdr_lf(&ptask->hdr);
 934                switch (lf) {
 935                case RFC2374_HDR_LASTFRAG:
 936                case RFC2374_HDR_UNFRAG:
 937                default:
 938                        dev_err(&dev->netdev->dev,
 939                                "outstanding packet %x lf %x, header %x,%x\n",
 940                                ptask->outstanding_pkts, lf, ptask->hdr.w0,
 941                                ptask->hdr.w1);
 942                        BUG();
 943
 944                case RFC2374_HDR_FIRSTFRAG:
 945                        /* Set frag type here for future interior fragments */
 946                        dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
 947                        fg_off = ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
 948                        datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
 949                        break;
 950
 951                case RFC2374_HDR_INTFRAG:
 952                        dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
 953                        fg_off = fwnet_get_hdr_fg_off(&ptask->hdr)
 954                                  + ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
 955                        datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
 956                        break;
 957                }
 958
 959                if (ptask->dest_node == IEEE1394_ALL_NODES) {
 960                        skb_pull(skb,
 961                                 ptask->max_payload + IEEE1394_GASP_HDR_SIZE);
 962                } else {
 963                        skb_pull(skb, ptask->max_payload);
 964                }
 965                if (ptask->outstanding_pkts > 1) {
 966                        fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_INTFRAG,
 967                                          dg_size, fg_off, datagram_label);
 968                } else {
 969                        fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_LASTFRAG,
 970                                          dg_size, fg_off, datagram_label);
 971                        ptask->max_payload = skb->len + RFC2374_FRAG_HDR_SIZE;
 972                }
 973                fwnet_send_packet(ptask);
 974        }
 975
 976        if (free)
 977                fwnet_free_ptask(ptask);
 978}
 979
 980static void fwnet_transmit_packet_failed(struct fwnet_packet_task *ptask)
 981{
 982        struct fwnet_device *dev = ptask->dev;
 983        unsigned long flags;
 984        bool free;
 985
 986        spin_lock_irqsave(&dev->lock, flags);
 987
 988        /* One fragment failed; don't try to send remaining fragments. */
 989        ptask->outstanding_pkts = 0;
 990
 991        /* Check whether we or the networking TX soft-IRQ is last user. */
 992        free = ptask->enqueued;
 993        if (free)
 994                dec_queued_datagrams(dev);
 995
 996        dev->netdev->stats.tx_dropped++;
 997        dev->netdev->stats.tx_errors++;
 998
 999        spin_unlock_irqrestore(&dev->lock, flags);
1000
1001        if (free)
1002                fwnet_free_ptask(ptask);
1003}
1004
1005static void fwnet_write_complete(struct fw_card *card, int rcode,
1006                                 void *payload, size_t length, void *data)
1007{
1008        struct fwnet_packet_task *ptask = data;
1009        static unsigned long j;
1010        static int last_rcode, errors_skipped;
1011
1012        if (rcode == RCODE_COMPLETE) {
1013                fwnet_transmit_packet_done(ptask);
1014        } else {
1015                fwnet_transmit_packet_failed(ptask);
1016
1017                if (printk_timed_ratelimit(&j,  1000) || rcode != last_rcode) {
1018                        dev_err(&ptask->dev->netdev->dev,
1019                                "fwnet_write_complete failed: %x (skipped %d)\n",
1020                                rcode, errors_skipped);
1021
1022                        errors_skipped = 0;
1023                        last_rcode = rcode;
1024                } else
1025                        errors_skipped++;
1026        }
1027}
1028
1029static int fwnet_send_packet(struct fwnet_packet_task *ptask)
1030{
1031        struct fwnet_device *dev;
1032        unsigned tx_len;
1033        struct rfc2734_header *bufhdr;
1034        unsigned long flags;
1035        bool free;
1036
1037        dev = ptask->dev;
1038        tx_len = ptask->max_payload;
1039        switch (fwnet_get_hdr_lf(&ptask->hdr)) {
1040        case RFC2374_HDR_UNFRAG:
1041                bufhdr = (struct rfc2734_header *)
1042                                skb_push(ptask->skb, RFC2374_UNFRAG_HDR_SIZE);
1043                put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
1044                break;
1045
1046        case RFC2374_HDR_FIRSTFRAG:
1047        case RFC2374_HDR_INTFRAG:
1048        case RFC2374_HDR_LASTFRAG:
1049                bufhdr = (struct rfc2734_header *)
1050                                skb_push(ptask->skb, RFC2374_FRAG_HDR_SIZE);
1051                put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
1052                put_unaligned_be32(ptask->hdr.w1, &bufhdr->w1);
1053                break;
1054
1055        default:
1056                BUG();
1057        }
1058        if (ptask->dest_node == IEEE1394_ALL_NODES) {
1059                u8 *p;
1060                int generation;
1061                int node_id;
1062
1063                /* ptask->generation may not have been set yet */
1064                generation = dev->card->generation;
1065                smp_rmb();
1066                node_id = dev->card->node_id;
1067
1068                p = skb_push(ptask->skb, IEEE1394_GASP_HDR_SIZE);
1069                put_unaligned_be32(node_id << 16 | IANA_SPECIFIER_ID >> 8, p);
1070                put_unaligned_be32((IANA_SPECIFIER_ID & 0xff) << 24
1071                                                | RFC2734_SW_VERSION, &p[4]);
1072
1073                /* We should not transmit if broadcast_channel.valid == 0. */
1074                fw_send_request(dev->card, &ptask->transaction,
1075                                TCODE_STREAM_DATA,
1076                                fw_stream_packet_destination_id(3,
1077                                                IEEE1394_BROADCAST_CHANNEL, 0),
1078                                generation, SCODE_100, 0ULL, ptask->skb->data,
1079                                tx_len + 8, fwnet_write_complete, ptask);
1080
1081                spin_lock_irqsave(&dev->lock, flags);
1082
1083                /* If the AT tasklet already ran, we may be last user. */
1084                free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1085                if (!free)
1086                        ptask->enqueued = true;
1087                else
1088                        dec_queued_datagrams(dev);
1089
1090                spin_unlock_irqrestore(&dev->lock, flags);
1091
1092                goto out;
1093        }
1094
1095        fw_send_request(dev->card, &ptask->transaction,
1096                        TCODE_WRITE_BLOCK_REQUEST, ptask->dest_node,
1097                        ptask->generation, ptask->speed, ptask->fifo_addr,
1098                        ptask->skb->data, tx_len, fwnet_write_complete, ptask);
1099
1100        spin_lock_irqsave(&dev->lock, flags);
1101
1102        /* If the AT tasklet already ran, we may be last user. */
1103        free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1104        if (!free)
1105                ptask->enqueued = true;
1106        else
1107                dec_queued_datagrams(dev);
1108
1109        spin_unlock_irqrestore(&dev->lock, flags);
1110
1111        dev->netdev->trans_start = jiffies;
1112 out:
1113        if (free)
1114                fwnet_free_ptask(ptask);
1115
1116        return 0;
1117}
1118
1119static int fwnet_broadcast_start(struct fwnet_device *dev)
1120{
1121        struct fw_iso_context *context;
1122        int retval;
1123        unsigned num_packets;
1124        unsigned max_receive;
1125        struct fw_iso_packet packet;
1126        unsigned long offset;
1127        unsigned u;
1128
1129        if (dev->local_fifo == FWNET_NO_FIFO_ADDR) {
1130                dev->handler.length = 4096;
1131                dev->handler.address_callback = fwnet_receive_packet;
1132                dev->handler.callback_data = dev;
1133
1134                retval = fw_core_add_address_handler(&dev->handler,
1135                                        &fw_high_memory_region);
1136                if (retval < 0)
1137                        goto failed_initial;
1138
1139                dev->local_fifo = dev->handler.offset;
1140        }
1141
1142        max_receive = 1U << (dev->card->max_receive + 1);
1143        num_packets = (FWNET_ISO_PAGE_COUNT * PAGE_SIZE) / max_receive;
1144
1145        if (!dev->broadcast_rcv_context) {
1146                void **ptrptr;
1147
1148                context = fw_iso_context_create(dev->card,
1149                    FW_ISO_CONTEXT_RECEIVE, IEEE1394_BROADCAST_CHANNEL,
1150                    dev->card->link_speed, 8, fwnet_receive_broadcast, dev);
1151                if (IS_ERR(context)) {
1152                        retval = PTR_ERR(context);
1153                        goto failed_context_create;
1154                }
1155
1156                retval = fw_iso_buffer_init(&dev->broadcast_rcv_buffer,
1157                    dev->card, FWNET_ISO_PAGE_COUNT, DMA_FROM_DEVICE);
1158                if (retval < 0)
1159                        goto failed_buffer_init;
1160
1161                ptrptr = kmalloc(sizeof(void *) * num_packets, GFP_KERNEL);
1162                if (!ptrptr) {
1163                        retval = -ENOMEM;
1164                        goto failed_ptrs_alloc;
1165                }
1166
1167                dev->broadcast_rcv_buffer_ptrs = ptrptr;
1168                for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++) {
1169                        void *ptr;
1170                        unsigned v;
1171
1172                        ptr = kmap(dev->broadcast_rcv_buffer.pages[u]);
1173                        for (v = 0; v < num_packets / FWNET_ISO_PAGE_COUNT; v++)
1174                                *ptrptr++ = (void *)
1175                                                ((char *)ptr + v * max_receive);
1176                }
1177                dev->broadcast_rcv_context = context;
1178        } else {
1179                context = dev->broadcast_rcv_context;
1180        }
1181
1182        packet.payload_length = max_receive;
1183        packet.interrupt = 1;
1184        packet.skip = 0;
1185        packet.tag = 3;
1186        packet.sy = 0;
1187        packet.header_length = IEEE1394_GASP_HDR_SIZE;
1188        offset = 0;
1189
1190        for (u = 0; u < num_packets; u++) {
1191                retval = fw_iso_context_queue(context, &packet,
1192                                &dev->broadcast_rcv_buffer, offset);
1193                if (retval < 0)
1194                        goto failed_rcv_queue;
1195
1196                offset += max_receive;
1197        }
1198        dev->num_broadcast_rcv_ptrs = num_packets;
1199        dev->rcv_buffer_size = max_receive;
1200        dev->broadcast_rcv_next_ptr = 0U;
1201        retval = fw_iso_context_start(context, -1, 0,
1202                        FW_ISO_CONTEXT_MATCH_ALL_TAGS); /* ??? sync */
1203        if (retval < 0)
1204                goto failed_rcv_queue;
1205
1206        /* FIXME: adjust it according to the min. speed of all known peers? */
1207        dev->broadcast_xmt_max_payload = IEEE1394_MAX_PAYLOAD_S100
1208                        - IEEE1394_GASP_HDR_SIZE - RFC2374_UNFRAG_HDR_SIZE;
1209        dev->broadcast_state = FWNET_BROADCAST_RUNNING;
1210
1211        return 0;
1212
1213 failed_rcv_queue:
1214        kfree(dev->broadcast_rcv_buffer_ptrs);
1215        dev->broadcast_rcv_buffer_ptrs = NULL;
1216 failed_ptrs_alloc:
1217        fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer, dev->card);
1218 failed_buffer_init:
1219        fw_iso_context_destroy(context);
1220        dev->broadcast_rcv_context = NULL;
1221 failed_context_create:
1222        fw_core_remove_address_handler(&dev->handler);
1223 failed_initial:
1224        dev->local_fifo = FWNET_NO_FIFO_ADDR;
1225
1226        return retval;
1227}
1228
1229static void set_carrier_state(struct fwnet_device *dev)
1230{
1231        if (dev->peer_count > 1)
1232                netif_carrier_on(dev->netdev);
1233        else
1234                netif_carrier_off(dev->netdev);
1235}
1236
1237/* ifup */
1238static int fwnet_open(struct net_device *net)
1239{
1240        struct fwnet_device *dev = netdev_priv(net);
1241        int ret;
1242
1243        if (dev->broadcast_state == FWNET_BROADCAST_ERROR) {
1244                ret = fwnet_broadcast_start(dev);
1245                if (ret)
1246                        return ret;
1247        }
1248        netif_start_queue(net);
1249
1250        spin_lock_irq(&dev->lock);
1251        set_carrier_state(dev);
1252        spin_unlock_irq(&dev->lock);
1253
1254        return 0;
1255}
1256
1257/* ifdown */
1258static int fwnet_stop(struct net_device *net)
1259{
1260        netif_stop_queue(net);
1261
1262        /* Deallocate iso context for use by other applications? */
1263
1264        return 0;
1265}
1266
1267static netdev_tx_t fwnet_tx(struct sk_buff *skb, struct net_device *net)
1268{
1269        struct fwnet_header hdr_buf;
1270        struct fwnet_device *dev = netdev_priv(net);
1271        __be16 proto;
1272        u16 dest_node;
1273        unsigned max_payload;
1274        u16 dg_size;
1275        u16 *datagram_label_ptr;
1276        struct fwnet_packet_task *ptask;
1277        struct fwnet_peer *peer;
1278        unsigned long flags;
1279
1280        spin_lock_irqsave(&dev->lock, flags);
1281
1282        /* Can this happen? */
1283        if (netif_queue_stopped(dev->netdev)) {
1284                spin_unlock_irqrestore(&dev->lock, flags);
1285
1286                return NETDEV_TX_BUSY;
1287        }
1288
1289        ptask = kmem_cache_alloc(fwnet_packet_task_cache, GFP_ATOMIC);
1290        if (ptask == NULL)
1291                goto fail;
1292
1293        skb = skb_share_check(skb, GFP_ATOMIC);
1294        if (!skb)
1295                goto fail;
1296
1297        /*
1298         * Make a copy of the driver-specific header.
1299         * We might need to rebuild the header on tx failure.
1300         */
1301        memcpy(&hdr_buf, skb->data, sizeof(hdr_buf));
1302        skb_pull(skb, sizeof(hdr_buf));
1303
1304        proto = hdr_buf.h_proto;
1305        dg_size = skb->len;
1306
1307        /*
1308         * Set the transmission type for the packet.  ARP packets and IP
1309         * broadcast packets are sent via GASP.
1310         */
1311        if (memcmp(hdr_buf.h_dest, net->broadcast, FWNET_ALEN) == 0
1312            || proto == htons(ETH_P_ARP)
1313            || (proto == htons(ETH_P_IP)
1314                && IN_MULTICAST(ntohl(ip_hdr(skb)->daddr)))) {
1315                max_payload        = dev->broadcast_xmt_max_payload;
1316                datagram_label_ptr = &dev->broadcast_xmt_datagramlabel;
1317
1318                ptask->fifo_addr   = FWNET_NO_FIFO_ADDR;
1319                ptask->generation  = 0;
1320                ptask->dest_node   = IEEE1394_ALL_NODES;
1321                ptask->speed       = SCODE_100;
1322        } else {
1323                __be64 guid = get_unaligned((__be64 *)hdr_buf.h_dest);
1324                u8 generation;
1325
1326                peer = fwnet_peer_find_by_guid(dev, be64_to_cpu(guid));
1327                if (!peer || peer->fifo == FWNET_NO_FIFO_ADDR)
1328                        goto fail;
1329
1330                generation         = peer->generation;
1331                dest_node          = peer->node_id;
1332                max_payload        = peer->max_payload;
1333                datagram_label_ptr = &peer->datagram_label;
1334
1335                ptask->fifo_addr   = peer->fifo;
1336                ptask->generation  = generation;
1337                ptask->dest_node   = dest_node;
1338                ptask->speed       = peer->speed;
1339        }
1340
1341        /* If this is an ARP packet, convert it */
1342        if (proto == htons(ETH_P_ARP)) {
1343                struct arphdr *arp = (struct arphdr *)skb->data;
1344                unsigned char *arp_ptr = (unsigned char *)(arp + 1);
1345                struct rfc2734_arp *arp1394 = (struct rfc2734_arp *)skb->data;
1346                __be32 ipaddr;
1347
1348                ipaddr = get_unaligned((__be32 *)(arp_ptr + FWNET_ALEN));
1349
1350                arp1394->hw_addr_len    = RFC2734_HW_ADDR_LEN;
1351                arp1394->max_rec        = dev->card->max_receive;
1352                arp1394->sspd           = dev->card->link_speed;
1353
1354                put_unaligned_be16(dev->local_fifo >> 32,
1355                                   &arp1394->fifo_hi);
1356                put_unaligned_be32(dev->local_fifo & 0xffffffff,
1357                                   &arp1394->fifo_lo);
1358                put_unaligned(ipaddr, &arp1394->sip);
1359        }
1360
1361        ptask->hdr.w0 = 0;
1362        ptask->hdr.w1 = 0;
1363        ptask->skb = skb;
1364        ptask->dev = dev;
1365
1366        /* Does it all fit in one packet? */
1367        if (dg_size <= max_payload) {
1368                fwnet_make_uf_hdr(&ptask->hdr, ntohs(proto));
1369                ptask->outstanding_pkts = 1;
1370                max_payload = dg_size + RFC2374_UNFRAG_HDR_SIZE;
1371        } else {
1372                u16 datagram_label;
1373
1374                max_payload -= RFC2374_FRAG_OVERHEAD;
1375                datagram_label = (*datagram_label_ptr)++;
1376                fwnet_make_ff_hdr(&ptask->hdr, ntohs(proto), dg_size,
1377                                  datagram_label);
1378                ptask->outstanding_pkts = DIV_ROUND_UP(dg_size, max_payload);
1379                max_payload += RFC2374_FRAG_HDR_SIZE;
1380        }
1381
1382        if (++dev->queued_datagrams == FWNET_MAX_QUEUED_DATAGRAMS)
1383                netif_stop_queue(dev->netdev);
1384
1385        spin_unlock_irqrestore(&dev->lock, flags);
1386
1387        ptask->max_payload = max_payload;
1388        ptask->enqueued    = 0;
1389
1390        fwnet_send_packet(ptask);
1391
1392        return NETDEV_TX_OK;
1393
1394 fail:
1395        spin_unlock_irqrestore(&dev->lock, flags);
1396
1397        if (ptask)
1398                kmem_cache_free(fwnet_packet_task_cache, ptask);
1399
1400        if (skb != NULL)
1401                dev_kfree_skb(skb);
1402
1403        net->stats.tx_dropped++;
1404        net->stats.tx_errors++;
1405
1406        /*
1407         * FIXME: According to a patch from 2003-02-26, "returning non-zero
1408         * causes serious problems" here, allegedly.  Before that patch,
1409         * -ERRNO was returned which is not appropriate under Linux 2.6.
1410         * Perhaps more needs to be done?  Stop the queue in serious
1411         * conditions and restart it elsewhere?
1412         */
1413        return NETDEV_TX_OK;
1414}
1415
1416static int fwnet_change_mtu(struct net_device *net, int new_mtu)
1417{
1418        if (new_mtu < 68)
1419                return -EINVAL;
1420
1421        net->mtu = new_mtu;
1422        return 0;
1423}
1424
1425static const struct ethtool_ops fwnet_ethtool_ops = {
1426        .get_link       = ethtool_op_get_link,
1427};
1428
1429static const struct net_device_ops fwnet_netdev_ops = {
1430        .ndo_open       = fwnet_open,
1431        .ndo_stop       = fwnet_stop,
1432        .ndo_start_xmit = fwnet_tx,
1433        .ndo_change_mtu = fwnet_change_mtu,
1434};
1435
1436static void fwnet_init_dev(struct net_device *net)
1437{
1438        net->header_ops         = &fwnet_header_ops;
1439        net->netdev_ops         = &fwnet_netdev_ops;
1440        net->watchdog_timeo     = 2 * HZ;
1441        net->flags              = IFF_BROADCAST | IFF_MULTICAST;
1442        net->features           = NETIF_F_HIGHDMA;
1443        net->addr_len           = FWNET_ALEN;
1444        net->hard_header_len    = FWNET_HLEN;
1445        net->type               = ARPHRD_IEEE1394;
1446        net->tx_queue_len       = FWNET_TX_QUEUE_LEN;
1447        net->ethtool_ops        = &fwnet_ethtool_ops;
1448}
1449
1450/* caller must hold fwnet_device_mutex */
1451static struct fwnet_device *fwnet_dev_find(struct fw_card *card)
1452{
1453        struct fwnet_device *dev;
1454
1455        list_for_each_entry(dev, &fwnet_device_list, dev_link)
1456                if (dev->card == card)
1457                        return dev;
1458
1459        return NULL;
1460}
1461
1462static int fwnet_add_peer(struct fwnet_device *dev,
1463                          struct fw_unit *unit, struct fw_device *device)
1464{
1465        struct fwnet_peer *peer;
1466
1467        peer = kmalloc(sizeof(*peer), GFP_KERNEL);
1468        if (!peer)
1469                return -ENOMEM;
1470
1471        dev_set_drvdata(&unit->device, peer);
1472
1473        peer->dev = dev;
1474        peer->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4];
1475        peer->fifo = FWNET_NO_FIFO_ADDR;
1476        peer->ip = 0;
1477        INIT_LIST_HEAD(&peer->pd_list);
1478        peer->pdg_size = 0;
1479        peer->datagram_label = 0;
1480        peer->speed = device->max_speed;
1481        peer->max_payload = fwnet_max_payload(device->max_rec, peer->speed);
1482
1483        peer->generation = device->generation;
1484        smp_rmb();
1485        peer->node_id = device->node_id;
1486
1487        spin_lock_irq(&dev->lock);
1488        list_add_tail(&peer->peer_link, &dev->peer_list);
1489        dev->peer_count++;
1490        set_carrier_state(dev);
1491        spin_unlock_irq(&dev->lock);
1492
1493        return 0;
1494}
1495
1496static int fwnet_probe(struct device *_dev)
1497{
1498        struct fw_unit *unit = fw_unit(_dev);
1499        struct fw_device *device = fw_parent_device(unit);
1500        struct fw_card *card = device->card;
1501        struct net_device *net;
1502        bool allocated_netdev = false;
1503        struct fwnet_device *dev;
1504        unsigned max_mtu;
1505        int ret;
1506
1507        mutex_lock(&fwnet_device_mutex);
1508
1509        dev = fwnet_dev_find(card);
1510        if (dev) {
1511                net = dev->netdev;
1512                goto have_dev;
1513        }
1514
1515        net = alloc_netdev(sizeof(*dev), "firewire%d", fwnet_init_dev);
1516        if (net == NULL) {
1517                ret = -ENOMEM;
1518                goto out;
1519        }
1520
1521        allocated_netdev = true;
1522        SET_NETDEV_DEV(net, card->device);
1523        dev = netdev_priv(net);
1524
1525        spin_lock_init(&dev->lock);
1526        dev->broadcast_state = FWNET_BROADCAST_ERROR;
1527        dev->broadcast_rcv_context = NULL;
1528        dev->broadcast_xmt_max_payload = 0;
1529        dev->broadcast_xmt_datagramlabel = 0;
1530        dev->local_fifo = FWNET_NO_FIFO_ADDR;
1531        dev->queued_datagrams = 0;
1532        INIT_LIST_HEAD(&dev->peer_list);
1533        dev->card = card;
1534        dev->netdev = net;
1535
1536        /*
1537         * Use the RFC 2734 default 1500 octets or the maximum payload
1538         * as initial MTU
1539         */
1540        max_mtu = (1 << (card->max_receive + 1))
1541                  - sizeof(struct rfc2734_header) - IEEE1394_GASP_HDR_SIZE;
1542        net->mtu = min(1500U, max_mtu);
1543
1544        /* Set our hardware address while we're at it */
1545        put_unaligned_be64(card->guid, net->dev_addr);
1546        put_unaligned_be64(~0ULL, net->broadcast);
1547        ret = register_netdev(net);
1548        if (ret)
1549                goto out;
1550
1551        list_add_tail(&dev->dev_link, &fwnet_device_list);
1552        dev_notice(&net->dev, "IPv4 over IEEE 1394 on card %s\n",
1553                   dev_name(card->device));
1554 have_dev:
1555        ret = fwnet_add_peer(dev, unit, device);
1556        if (ret && allocated_netdev) {
1557                unregister_netdev(net);
1558                list_del(&dev->dev_link);
1559        }
1560 out:
1561        if (ret && allocated_netdev)
1562                free_netdev(net);
1563
1564        mutex_unlock(&fwnet_device_mutex);
1565
1566        return ret;
1567}
1568
1569static void fwnet_remove_peer(struct fwnet_peer *peer, struct fwnet_device *dev)
1570{
1571        struct fwnet_partial_datagram *pd, *pd_next;
1572
1573        spin_lock_irq(&dev->lock);
1574        list_del(&peer->peer_link);
1575        dev->peer_count--;
1576        set_carrier_state(dev);
1577        spin_unlock_irq(&dev->lock);
1578
1579        list_for_each_entry_safe(pd, pd_next, &peer->pd_list, pd_link)
1580                fwnet_pd_delete(pd);
1581
1582        kfree(peer);
1583}
1584
1585static int fwnet_remove(struct device *_dev)
1586{
1587        struct fwnet_peer *peer = dev_get_drvdata(_dev);
1588        struct fwnet_device *dev = peer->dev;
1589        struct net_device *net;
1590        int i;
1591
1592        mutex_lock(&fwnet_device_mutex);
1593
1594        net = dev->netdev;
1595        if (net && peer->ip)
1596                arp_invalidate(net, peer->ip);
1597
1598        fwnet_remove_peer(peer, dev);
1599
1600        if (list_empty(&dev->peer_list)) {
1601                unregister_netdev(net);
1602
1603                if (dev->local_fifo != FWNET_NO_FIFO_ADDR)
1604                        fw_core_remove_address_handler(&dev->handler);
1605                if (dev->broadcast_rcv_context) {
1606                        fw_iso_context_stop(dev->broadcast_rcv_context);
1607                        fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer,
1608                                              dev->card);
1609                        fw_iso_context_destroy(dev->broadcast_rcv_context);
1610                }
1611                for (i = 0; dev->queued_datagrams && i < 5; i++)
1612                        ssleep(1);
1613                WARN_ON(dev->queued_datagrams);
1614                list_del(&dev->dev_link);
1615
1616                free_netdev(net);
1617        }
1618
1619        mutex_unlock(&fwnet_device_mutex);
1620
1621        return 0;
1622}
1623
1624/*
1625 * FIXME abort partially sent fragmented datagrams,
1626 * discard partially received fragmented datagrams
1627 */
1628static void fwnet_update(struct fw_unit *unit)
1629{
1630        struct fw_device *device = fw_parent_device(unit);
1631        struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1632        int generation;
1633
1634        generation = device->generation;
1635
1636        spin_lock_irq(&peer->dev->lock);
1637        peer->node_id    = device->node_id;
1638        peer->generation = generation;
1639        spin_unlock_irq(&peer->dev->lock);
1640}
1641
1642static const struct ieee1394_device_id fwnet_id_table[] = {
1643        {
1644                .match_flags  = IEEE1394_MATCH_SPECIFIER_ID |
1645                                IEEE1394_MATCH_VERSION,
1646                .specifier_id = IANA_SPECIFIER_ID,
1647                .version      = RFC2734_SW_VERSION,
1648        },
1649        { }
1650};
1651
1652static struct fw_driver fwnet_driver = {
1653        .driver = {
1654                .owner  = THIS_MODULE,
1655                .name   = KBUILD_MODNAME,
1656                .bus    = &fw_bus_type,
1657                .probe  = fwnet_probe,
1658                .remove = fwnet_remove,
1659        },
1660        .update   = fwnet_update,
1661        .id_table = fwnet_id_table,
1662};
1663
1664static const u32 rfc2374_unit_directory_data[] = {
1665        0x00040000,     /* directory_length             */
1666        0x1200005e,     /* unit_specifier_id: IANA      */
1667        0x81000003,     /* textual descriptor offset    */
1668        0x13000001,     /* unit_sw_version: RFC 2734    */
1669        0x81000005,     /* textual descriptor offset    */
1670        0x00030000,     /* descriptor_length            */
1671        0x00000000,     /* text                         */
1672        0x00000000,     /* minimal ASCII, en            */
1673        0x49414e41,     /* I A N A                      */
1674        0x00030000,     /* descriptor_length            */
1675        0x00000000,     /* text                         */
1676        0x00000000,     /* minimal ASCII, en            */
1677        0x49507634,     /* I P v 4                      */
1678};
1679
1680static struct fw_descriptor rfc2374_unit_directory = {
1681        .length = ARRAY_SIZE(rfc2374_unit_directory_data),
1682        .key    = (CSR_DIRECTORY | CSR_UNIT) << 24,
1683        .data   = rfc2374_unit_directory_data
1684};
1685
1686static int __init fwnet_init(void)
1687{
1688        int err;
1689
1690        err = fw_core_add_descriptor(&rfc2374_unit_directory);
1691        if (err)
1692                return err;
1693
1694        fwnet_packet_task_cache = kmem_cache_create("packet_task",
1695                        sizeof(struct fwnet_packet_task), 0, 0, NULL);
1696        if (!fwnet_packet_task_cache) {
1697                err = -ENOMEM;
1698                goto out;
1699        }
1700
1701        err = driver_register(&fwnet_driver.driver);
1702        if (!err)
1703                return 0;
1704
1705        kmem_cache_destroy(fwnet_packet_task_cache);
1706out:
1707        fw_core_remove_descriptor(&rfc2374_unit_directory);
1708
1709        return err;
1710}
1711module_init(fwnet_init);
1712
1713static void __exit fwnet_cleanup(void)
1714{
1715        driver_unregister(&fwnet_driver.driver);
1716        kmem_cache_destroy(fwnet_packet_task_cache);
1717        fw_core_remove_descriptor(&rfc2374_unit_directory);
1718}
1719module_exit(fwnet_cleanup);
1720
1721MODULE_AUTHOR("Jay Fenlason <fenlason@redhat.com>");
1722MODULE_DESCRIPTION("IPv4 over IEEE1394 as per RFC 2734");
1723MODULE_LICENSE("GPL");
1724MODULE_DEVICE_TABLE(ieee1394, fwnet_id_table);
1725
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