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 + 16 - 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 + 16 - 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 + net->hard_header_len + 15);
 402        if (new->skb == NULL)
 403                goto fail_w_fi;
 404
 405        skb_reserve(new->skb, (net->hard_header_len + 15) & ~15);
 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_UNNECESSARY;  /* don't check it */
 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 + net->hard_header_len + 15);
 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, (net->hard_header_len + 15) & ~15);
 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        struct fw_card *card;
 832        __be16 *hdr_ptr;
 833        __be32 *buf_ptr;
 834        int retval;
 835        u32 length;
 836        u16 source_node_id;
 837        u32 specifier_id;
 838        u32 ver;
 839        unsigned long offset;
 840        unsigned long flags;
 841
 842        dev = data;
 843        card = dev->card;
 844        hdr_ptr = header;
 845        length = be16_to_cpup(hdr_ptr);
 846
 847        spin_lock_irqsave(&dev->lock, flags);
 848
 849        offset = dev->rcv_buffer_size * dev->broadcast_rcv_next_ptr;
 850        buf_ptr = dev->broadcast_rcv_buffer_ptrs[dev->broadcast_rcv_next_ptr++];
 851        if (dev->broadcast_rcv_next_ptr == dev->num_broadcast_rcv_ptrs)
 852                dev->broadcast_rcv_next_ptr = 0;
 853
 854        spin_unlock_irqrestore(&dev->lock, flags);
 855
 856        specifier_id =    (be32_to_cpu(buf_ptr[0]) & 0xffff) << 8
 857                        | (be32_to_cpu(buf_ptr[1]) & 0xff000000) >> 24;
 858        ver = be32_to_cpu(buf_ptr[1]) & 0xffffff;
 859        source_node_id = be32_to_cpu(buf_ptr[0]) >> 16;
 860
 861        if (specifier_id == IANA_SPECIFIER_ID && ver == RFC2734_SW_VERSION) {
 862                buf_ptr += 2;
 863                length -= IEEE1394_GASP_HDR_SIZE;
 864                fwnet_incoming_packet(dev, buf_ptr, length, source_node_id,
 865                                      context->card->generation, true);
 866        }
 867
 868        packet.payload_length = dev->rcv_buffer_size;
 869        packet.interrupt = 1;
 870        packet.skip = 0;
 871        packet.tag = 3;
 872        packet.sy = 0;
 873        packet.header_length = IEEE1394_GASP_HDR_SIZE;
 874
 875        spin_lock_irqsave(&dev->lock, flags);
 876
 877        retval = fw_iso_context_queue(dev->broadcast_rcv_context, &packet,
 878                                      &dev->broadcast_rcv_buffer, offset);
 879
 880        spin_unlock_irqrestore(&dev->lock, flags);
 881
 882        if (retval >= 0)
 883                fw_iso_context_queue_flush(dev->broadcast_rcv_context);
 884        else
 885                dev_err(&dev->netdev->dev, "requeue failed\n");
 886}
 887
 888static struct kmem_cache *fwnet_packet_task_cache;
 889
 890static void fwnet_free_ptask(struct fwnet_packet_task *ptask)
 891{
 892        dev_kfree_skb_any(ptask->skb);
 893        kmem_cache_free(fwnet_packet_task_cache, ptask);
 894}
 895
 896/* Caller must hold dev->lock. */
 897static void dec_queued_datagrams(struct fwnet_device *dev)
 898{
 899        if (--dev->queued_datagrams == FWNET_MIN_QUEUED_DATAGRAMS)
 900                netif_wake_queue(dev->netdev);
 901}
 902
 903static int fwnet_send_packet(struct fwnet_packet_task *ptask);
 904
 905static void fwnet_transmit_packet_done(struct fwnet_packet_task *ptask)
 906{
 907        struct fwnet_device *dev = ptask->dev;
 908        struct sk_buff *skb = ptask->skb;
 909        unsigned long flags;
 910        bool free;
 911
 912        spin_lock_irqsave(&dev->lock, flags);
 913
 914        ptask->outstanding_pkts--;
 915
 916        /* Check whether we or the networking TX soft-IRQ is last user. */
 917        free = (ptask->outstanding_pkts == 0 && ptask->enqueued);
 918        if (free)
 919                dec_queued_datagrams(dev);
 920
 921        if (ptask->outstanding_pkts == 0) {
 922                dev->netdev->stats.tx_packets++;
 923                dev->netdev->stats.tx_bytes += skb->len;
 924        }
 925
 926        spin_unlock_irqrestore(&dev->lock, flags);
 927
 928        if (ptask->outstanding_pkts > 0) {
 929                u16 dg_size;
 930                u16 fg_off;
 931                u16 datagram_label;
 932                u16 lf;
 933
 934                /* Update the ptask to point to the next fragment and send it */
 935                lf = fwnet_get_hdr_lf(&ptask->hdr);
 936                switch (lf) {
 937                case RFC2374_HDR_LASTFRAG:
 938                case RFC2374_HDR_UNFRAG:
 939                default:
 940                        dev_err(&dev->netdev->dev,
 941                                "outstanding packet %x lf %x, header %x,%x\n",
 942                                ptask->outstanding_pkts, lf, ptask->hdr.w0,
 943                                ptask->hdr.w1);
 944                        BUG();
 945
 946                case RFC2374_HDR_FIRSTFRAG:
 947                        /* Set frag type here for future interior fragments */
 948                        dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
 949                        fg_off = ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
 950                        datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
 951                        break;
 952
 953                case RFC2374_HDR_INTFRAG:
 954                        dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
 955                        fg_off = fwnet_get_hdr_fg_off(&ptask->hdr)
 956                                  + ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
 957                        datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
 958                        break;
 959                }
 960
 961                if (ptask->dest_node == IEEE1394_ALL_NODES) {
 962                        skb_pull(skb,
 963                                 ptask->max_payload + IEEE1394_GASP_HDR_SIZE);
 964                } else {
 965                        skb_pull(skb, ptask->max_payload);
 966                }
 967                if (ptask->outstanding_pkts > 1) {
 968                        fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_INTFRAG,
 969                                          dg_size, fg_off, datagram_label);
 970                } else {
 971                        fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_LASTFRAG,
 972                                          dg_size, fg_off, datagram_label);
 973                        ptask->max_payload = skb->len + RFC2374_FRAG_HDR_SIZE;
 974                }
 975                fwnet_send_packet(ptask);
 976        }
 977
 978        if (free)
 979                fwnet_free_ptask(ptask);
 980}
 981
 982static void fwnet_transmit_packet_failed(struct fwnet_packet_task *ptask)
 983{
 984        struct fwnet_device *dev = ptask->dev;
 985        unsigned long flags;
 986        bool free;
 987
 988        spin_lock_irqsave(&dev->lock, flags);
 989
 990        /* One fragment failed; don't try to send remaining fragments. */
 991        ptask->outstanding_pkts = 0;
 992
 993        /* Check whether we or the networking TX soft-IRQ is last user. */
 994        free = ptask->enqueued;
 995        if (free)
 996                dec_queued_datagrams(dev);
 997
 998        dev->netdev->stats.tx_dropped++;
 999        dev->netdev->stats.tx_errors++;
1000
1001        spin_unlock_irqrestore(&dev->lock, flags);
1002
1003        if (free)
1004                fwnet_free_ptask(ptask);
1005}
1006
1007static void fwnet_write_complete(struct fw_card *card, int rcode,
1008                                 void *payload, size_t length, void *data)
1009{
1010        struct fwnet_packet_task *ptask = data;
1011        static unsigned long j;
1012        static int last_rcode, errors_skipped;
1013
1014        if (rcode == RCODE_COMPLETE) {
1015                fwnet_transmit_packet_done(ptask);
1016        } else {
1017                fwnet_transmit_packet_failed(ptask);
1018
1019                if (printk_timed_ratelimit(&j,  1000) || rcode != last_rcode) {
1020                        dev_err(&ptask->dev->netdev->dev,
1021                                "fwnet_write_complete failed: %x (skipped %d)\n",
1022                                rcode, errors_skipped);
1023
1024                        errors_skipped = 0;
1025                        last_rcode = rcode;
1026                } else
1027                        errors_skipped++;
1028        }
1029}
1030
1031static int fwnet_send_packet(struct fwnet_packet_task *ptask)
1032{
1033        struct fwnet_device *dev;
1034        unsigned tx_len;
1035        struct rfc2734_header *bufhdr;
1036        unsigned long flags;
1037        bool free;
1038
1039        dev = ptask->dev;
1040        tx_len = ptask->max_payload;
1041        switch (fwnet_get_hdr_lf(&ptask->hdr)) {
1042        case RFC2374_HDR_UNFRAG:
1043                bufhdr = (struct rfc2734_header *)
1044                                skb_push(ptask->skb, RFC2374_UNFRAG_HDR_SIZE);
1045                put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
1046                break;
1047
1048        case RFC2374_HDR_FIRSTFRAG:
1049        case RFC2374_HDR_INTFRAG:
1050        case RFC2374_HDR_LASTFRAG:
1051                bufhdr = (struct rfc2734_header *)
1052                                skb_push(ptask->skb, RFC2374_FRAG_HDR_SIZE);
1053                put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
1054                put_unaligned_be32(ptask->hdr.w1, &bufhdr->w1);
1055                break;
1056
1057        default:
1058                BUG();
1059        }
1060        if (ptask->dest_node == IEEE1394_ALL_NODES) {
1061                u8 *p;
1062                int generation;
1063                int node_id;
1064
1065                /* ptask->generation may not have been set yet */
1066                generation = dev->card->generation;
1067                smp_rmb();
1068                node_id = dev->card->node_id;
1069
1070                p = skb_push(ptask->skb, IEEE1394_GASP_HDR_SIZE);
1071                put_unaligned_be32(node_id << 16 | IANA_SPECIFIER_ID >> 8, p);
1072                put_unaligned_be32((IANA_SPECIFIER_ID & 0xff) << 24
1073                                                | RFC2734_SW_VERSION, &p[4]);
1074
1075                /* We should not transmit if broadcast_channel.valid == 0. */
1076                fw_send_request(dev->card, &ptask->transaction,
1077                                TCODE_STREAM_DATA,
1078                                fw_stream_packet_destination_id(3,
1079                                                IEEE1394_BROADCAST_CHANNEL, 0),
1080                                generation, SCODE_100, 0ULL, ptask->skb->data,
1081                                tx_len + 8, fwnet_write_complete, ptask);
1082
1083                spin_lock_irqsave(&dev->lock, flags);
1084
1085                /* If the AT tasklet already ran, we may be last user. */
1086                free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1087                if (!free)
1088                        ptask->enqueued = true;
1089                else
1090                        dec_queued_datagrams(dev);
1091
1092                spin_unlock_irqrestore(&dev->lock, flags);
1093
1094                goto out;
1095        }
1096
1097        fw_send_request(dev->card, &ptask->transaction,
1098                        TCODE_WRITE_BLOCK_REQUEST, ptask->dest_node,
1099                        ptask->generation, ptask->speed, ptask->fifo_addr,
1100                        ptask->skb->data, tx_len, fwnet_write_complete, ptask);
1101
1102        spin_lock_irqsave(&dev->lock, flags);
1103
1104        /* If the AT tasklet already ran, we may be last user. */
1105        free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1106        if (!free)
1107                ptask->enqueued = true;
1108        else
1109                dec_queued_datagrams(dev);
1110
1111        spin_unlock_irqrestore(&dev->lock, flags);
1112
1113        dev->netdev->trans_start = jiffies;
1114 out:
1115        if (free)
1116                fwnet_free_ptask(ptask);
1117
1118        return 0;
1119}
1120
1121static int fwnet_broadcast_start(struct fwnet_device *dev)
1122{
1123        struct fw_iso_context *context;
1124        int retval;
1125        unsigned num_packets;
1126        unsigned max_receive;
1127        struct fw_iso_packet packet;
1128        unsigned long offset;
1129        unsigned u;
1130
1131        if (dev->local_fifo == FWNET_NO_FIFO_ADDR) {
1132                dev->handler.length = 4096;
1133                dev->handler.address_callback = fwnet_receive_packet;
1134                dev->handler.callback_data = dev;
1135
1136                retval = fw_core_add_address_handler(&dev->handler,
1137                                        &fw_high_memory_region);
1138                if (retval < 0)
1139                        goto failed_initial;
1140
1141                dev->local_fifo = dev->handler.offset;
1142        }
1143
1144        max_receive = 1U << (dev->card->max_receive + 1);
1145        num_packets = (FWNET_ISO_PAGE_COUNT * PAGE_SIZE) / max_receive;
1146
1147        if (!dev->broadcast_rcv_context) {
1148                void **ptrptr;
1149
1150                context = fw_iso_context_create(dev->card,
1151                    FW_ISO_CONTEXT_RECEIVE, IEEE1394_BROADCAST_CHANNEL,
1152                    dev->card->link_speed, 8, fwnet_receive_broadcast, dev);
1153                if (IS_ERR(context)) {
1154                        retval = PTR_ERR(context);
1155                        goto failed_context_create;
1156                }
1157
1158                retval = fw_iso_buffer_init(&dev->broadcast_rcv_buffer,
1159                    dev->card, FWNET_ISO_PAGE_COUNT, DMA_FROM_DEVICE);
1160                if (retval < 0)
1161                        goto failed_buffer_init;
1162
1163                ptrptr = kmalloc(sizeof(void *) * num_packets, GFP_KERNEL);
1164                if (!ptrptr) {
1165                        retval = -ENOMEM;
1166                        goto failed_ptrs_alloc;
1167                }
1168
1169                dev->broadcast_rcv_buffer_ptrs = ptrptr;
1170                for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++) {
1171                        void *ptr;
1172                        unsigned v;
1173
1174                        ptr = kmap(dev->broadcast_rcv_buffer.pages[u]);
1175                        for (v = 0; v < num_packets / FWNET_ISO_PAGE_COUNT; v++)
1176                                *ptrptr++ = (void *)
1177                                                ((char *)ptr + v * max_receive);
1178                }
1179                dev->broadcast_rcv_context = context;
1180        } else {
1181                context = dev->broadcast_rcv_context;
1182        }
1183
1184        packet.payload_length = max_receive;
1185        packet.interrupt = 1;
1186        packet.skip = 0;
1187        packet.tag = 3;
1188        packet.sy = 0;
1189        packet.header_length = IEEE1394_GASP_HDR_SIZE;
1190        offset = 0;
1191
1192        for (u = 0; u < num_packets; u++) {
1193                retval = fw_iso_context_queue(context, &packet,
1194                                &dev->broadcast_rcv_buffer, offset);
1195                if (retval < 0)
1196                        goto failed_rcv_queue;
1197
1198                offset += max_receive;
1199        }
1200        dev->num_broadcast_rcv_ptrs = num_packets;
1201        dev->rcv_buffer_size = max_receive;
1202        dev->broadcast_rcv_next_ptr = 0U;
1203        retval = fw_iso_context_start(context, -1, 0,
1204                        FW_ISO_CONTEXT_MATCH_ALL_TAGS); /* ??? sync */
1205        if (retval < 0)
1206                goto failed_rcv_queue;
1207
1208        /* FIXME: adjust it according to the min. speed of all known peers? */
1209        dev->broadcast_xmt_max_payload = IEEE1394_MAX_PAYLOAD_S100
1210                        - IEEE1394_GASP_HDR_SIZE - RFC2374_UNFRAG_HDR_SIZE;
1211        dev->broadcast_state = FWNET_BROADCAST_RUNNING;
1212
1213        return 0;
1214
1215 failed_rcv_queue:
1216        kfree(dev->broadcast_rcv_buffer_ptrs);
1217        dev->broadcast_rcv_buffer_ptrs = NULL;
1218 failed_ptrs_alloc:
1219        fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer, dev->card);
1220 failed_buffer_init:
1221        fw_iso_context_destroy(context);
1222        dev->broadcast_rcv_context = NULL;
1223 failed_context_create:
1224        fw_core_remove_address_handler(&dev->handler);
1225 failed_initial:
1226        dev->local_fifo = FWNET_NO_FIFO_ADDR;
1227
1228        return retval;
1229}
1230
1231static void set_carrier_state(struct fwnet_device *dev)
1232{
1233        if (dev->peer_count > 1)
1234                netif_carrier_on(dev->netdev);
1235        else
1236                netif_carrier_off(dev->netdev);
1237}
1238
1239/* ifup */
1240static int fwnet_open(struct net_device *net)
1241{
1242        struct fwnet_device *dev = netdev_priv(net);
1243        int ret;
1244
1245        if (dev->broadcast_state == FWNET_BROADCAST_ERROR) {
1246                ret = fwnet_broadcast_start(dev);
1247                if (ret)
1248                        return ret;
1249        }
1250        netif_start_queue(net);
1251
1252        spin_lock_irq(&dev->lock);
1253        set_carrier_state(dev);
1254        spin_unlock_irq(&dev->lock);
1255
1256        return 0;
1257}
1258
1259/* ifdown */
1260static int fwnet_stop(struct net_device *net)
1261{
1262        netif_stop_queue(net);
1263
1264        /* Deallocate iso context for use by other applications? */
1265
1266        return 0;
1267}
1268
1269static netdev_tx_t fwnet_tx(struct sk_buff *skb, struct net_device *net)
1270{
1271        struct fwnet_header hdr_buf;
1272        struct fwnet_device *dev = netdev_priv(net);
1273        __be16 proto;
1274        u16 dest_node;
1275        unsigned max_payload;
1276        u16 dg_size;
1277        u16 *datagram_label_ptr;
1278        struct fwnet_packet_task *ptask;
1279        struct fwnet_peer *peer;
1280        unsigned long flags;
1281
1282        spin_lock_irqsave(&dev->lock, flags);
1283
1284        /* Can this happen? */
1285        if (netif_queue_stopped(dev->netdev)) {
1286                spin_unlock_irqrestore(&dev->lock, flags);
1287
1288                return NETDEV_TX_BUSY;
1289        }
1290
1291        ptask = kmem_cache_alloc(fwnet_packet_task_cache, GFP_ATOMIC);
1292        if (ptask == NULL)
1293                goto fail;
1294
1295        skb = skb_share_check(skb, GFP_ATOMIC);
1296        if (!skb)
1297                goto fail;
1298
1299        /*
1300         * Make a copy of the driver-specific header.
1301         * We might need to rebuild the header on tx failure.
1302         */
1303        memcpy(&hdr_buf, skb->data, sizeof(hdr_buf));
1304        skb_pull(skb, sizeof(hdr_buf));
1305
1306        proto = hdr_buf.h_proto;
1307        dg_size = skb->len;
1308
1309        /*
1310         * Set the transmission type for the packet.  ARP packets and IP
1311         * broadcast packets are sent via GASP.
1312         */
1313        if (memcmp(hdr_buf.h_dest, net->broadcast, FWNET_ALEN) == 0
1314            || proto == htons(ETH_P_ARP)
1315            || (proto == htons(ETH_P_IP)
1316                && IN_MULTICAST(ntohl(ip_hdr(skb)->daddr)))) {
1317                max_payload        = dev->broadcast_xmt_max_payload;
1318                datagram_label_ptr = &dev->broadcast_xmt_datagramlabel;
1319
1320                ptask->fifo_addr   = FWNET_NO_FIFO_ADDR;
1321                ptask->generation  = 0;
1322                ptask->dest_node   = IEEE1394_ALL_NODES;
1323                ptask->speed       = SCODE_100;
1324        } else {
1325                __be64 guid = get_unaligned((__be64 *)hdr_buf.h_dest);
1326                u8 generation;
1327
1328                peer = fwnet_peer_find_by_guid(dev, be64_to_cpu(guid));
1329                if (!peer || peer->fifo == FWNET_NO_FIFO_ADDR)
1330                        goto fail;
1331
1332                generation         = peer->generation;
1333                dest_node          = peer->node_id;
1334                max_payload        = peer->max_payload;
1335                datagram_label_ptr = &peer->datagram_label;
1336
1337                ptask->fifo_addr   = peer->fifo;
1338                ptask->generation  = generation;
1339                ptask->dest_node   = dest_node;
1340                ptask->speed       = peer->speed;
1341        }
1342
1343        /* If this is an ARP packet, convert it */
1344        if (proto == htons(ETH_P_ARP)) {
1345                struct arphdr *arp = (struct arphdr *)skb->data;
1346                unsigned char *arp_ptr = (unsigned char *)(arp + 1);
1347                struct rfc2734_arp *arp1394 = (struct rfc2734_arp *)skb->data;
1348                __be32 ipaddr;
1349
1350                ipaddr = get_unaligned((__be32 *)(arp_ptr + FWNET_ALEN));
1351
1352                arp1394->hw_addr_len    = RFC2734_HW_ADDR_LEN;
1353                arp1394->max_rec        = dev->card->max_receive;
1354                arp1394->sspd           = dev->card->link_speed;
1355
1356                put_unaligned_be16(dev->local_fifo >> 32,
1357                                   &arp1394->fifo_hi);
1358                put_unaligned_be32(dev->local_fifo & 0xffffffff,
1359                                   &arp1394->fifo_lo);
1360                put_unaligned(ipaddr, &arp1394->sip);
1361        }
1362
1363        ptask->hdr.w0 = 0;
1364        ptask->hdr.w1 = 0;
1365        ptask->skb = skb;
1366        ptask->dev = dev;
1367
1368        /* Does it all fit in one packet? */
1369        if (dg_size <= max_payload) {
1370                fwnet_make_uf_hdr(&ptask->hdr, ntohs(proto));
1371                ptask->outstanding_pkts = 1;
1372                max_payload = dg_size + RFC2374_UNFRAG_HDR_SIZE;
1373        } else {
1374                u16 datagram_label;
1375
1376                max_payload -= RFC2374_FRAG_OVERHEAD;
1377                datagram_label = (*datagram_label_ptr)++;
1378                fwnet_make_ff_hdr(&ptask->hdr, ntohs(proto), dg_size,
1379                                  datagram_label);
1380                ptask->outstanding_pkts = DIV_ROUND_UP(dg_size, max_payload);
1381                max_payload += RFC2374_FRAG_HDR_SIZE;
1382        }
1383
1384        if (++dev->queued_datagrams == FWNET_MAX_QUEUED_DATAGRAMS)
1385                netif_stop_queue(dev->netdev);
1386
1387        spin_unlock_irqrestore(&dev->lock, flags);
1388
1389        ptask->max_payload = max_payload;
1390        ptask->enqueued    = 0;
1391
1392        fwnet_send_packet(ptask);
1393
1394        return NETDEV_TX_OK;
1395
1396 fail:
1397        spin_unlock_irqrestore(&dev->lock, flags);
1398
1399        if (ptask)
1400                kmem_cache_free(fwnet_packet_task_cache, ptask);
1401
1402        if (skb != NULL)
1403                dev_kfree_skb(skb);
1404
1405        net->stats.tx_dropped++;
1406        net->stats.tx_errors++;
1407
1408        /*
1409         * FIXME: According to a patch from 2003-02-26, "returning non-zero
1410         * causes serious problems" here, allegedly.  Before that patch,
1411         * -ERRNO was returned which is not appropriate under Linux 2.6.
1412         * Perhaps more needs to be done?  Stop the queue in serious
1413         * conditions and restart it elsewhere?
1414         */
1415        return NETDEV_TX_OK;
1416}
1417
1418static int fwnet_change_mtu(struct net_device *net, int new_mtu)
1419{
1420        if (new_mtu < 68)
1421                return -EINVAL;
1422
1423        net->mtu = new_mtu;
1424        return 0;
1425}
1426
1427static const struct ethtool_ops fwnet_ethtool_ops = {
1428        .get_link       = ethtool_op_get_link,
1429};
1430
1431static const struct net_device_ops fwnet_netdev_ops = {
1432        .ndo_open       = fwnet_open,
1433        .ndo_stop       = fwnet_stop,
1434        .ndo_start_xmit = fwnet_tx,
1435        .ndo_change_mtu = fwnet_change_mtu,
1436};
1437
1438static void fwnet_init_dev(struct net_device *net)
1439{
1440        net->header_ops         = &fwnet_header_ops;
1441        net->netdev_ops         = &fwnet_netdev_ops;
1442        net->watchdog_timeo     = 2 * HZ;
1443        net->flags              = IFF_BROADCAST | IFF_MULTICAST;
1444        net->features           = NETIF_F_HIGHDMA;
1445        net->addr_len           = FWNET_ALEN;
1446        net->hard_header_len    = FWNET_HLEN;
1447        net->type               = ARPHRD_IEEE1394;
1448        net->tx_queue_len       = FWNET_TX_QUEUE_LEN;
1449        net->ethtool_ops        = &fwnet_ethtool_ops;
1450}
1451
1452/* caller must hold fwnet_device_mutex */
1453static struct fwnet_device *fwnet_dev_find(struct fw_card *card)
1454{
1455        struct fwnet_device *dev;
1456
1457        list_for_each_entry(dev, &fwnet_device_list, dev_link)
1458                if (dev->card == card)
1459                        return dev;
1460
1461        return NULL;
1462}
1463
1464static int fwnet_add_peer(struct fwnet_device *dev,
1465                          struct fw_unit *unit, struct fw_device *device)
1466{
1467        struct fwnet_peer *peer;
1468
1469        peer = kmalloc(sizeof(*peer), GFP_KERNEL);
1470        if (!peer)
1471                return -ENOMEM;
1472
1473        dev_set_drvdata(&unit->device, peer);
1474
1475        peer->dev = dev;
1476        peer->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4];
1477        peer->fifo = FWNET_NO_FIFO_ADDR;
1478        peer->ip = 0;
1479        INIT_LIST_HEAD(&peer->pd_list);
1480        peer->pdg_size = 0;
1481        peer->datagram_label = 0;
1482        peer->speed = device->max_speed;
1483        peer->max_payload = fwnet_max_payload(device->max_rec, peer->speed);
1484
1485        peer->generation = device->generation;
1486        smp_rmb();
1487        peer->node_id = device->node_id;
1488
1489        spin_lock_irq(&dev->lock);
1490        list_add_tail(&peer->peer_link, &dev->peer_list);
1491        dev->peer_count++;
1492        set_carrier_state(dev);
1493        spin_unlock_irq(&dev->lock);
1494
1495        return 0;
1496}
1497
1498static int fwnet_probe(struct device *_dev)
1499{
1500        struct fw_unit *unit = fw_unit(_dev);
1501        struct fw_device *device = fw_parent_device(unit);
1502        struct fw_card *card = device->card;
1503        struct net_device *net;
1504        bool allocated_netdev = false;
1505        struct fwnet_device *dev;
1506        unsigned max_mtu;
1507        int ret;
1508
1509        mutex_lock(&fwnet_device_mutex);
1510
1511        dev = fwnet_dev_find(card);
1512        if (dev) {
1513                net = dev->netdev;
1514                goto have_dev;
1515        }
1516
1517        net = alloc_netdev(sizeof(*dev), "firewire%d", fwnet_init_dev);
1518        if (net == NULL) {
1519                ret = -ENOMEM;
1520                goto out;
1521        }
1522
1523        allocated_netdev = true;
1524        SET_NETDEV_DEV(net, card->device);
1525        dev = netdev_priv(net);
1526
1527        spin_lock_init(&dev->lock);
1528        dev->broadcast_state = FWNET_BROADCAST_ERROR;
1529        dev->broadcast_rcv_context = NULL;
1530        dev->broadcast_xmt_max_payload = 0;
1531        dev->broadcast_xmt_datagramlabel = 0;
1532        dev->local_fifo = FWNET_NO_FIFO_ADDR;
1533        dev->queued_datagrams = 0;
1534        INIT_LIST_HEAD(&dev->peer_list);
1535        dev->card = card;
1536        dev->netdev = net;
1537
1538        /*
1539         * Use the RFC 2734 default 1500 octets or the maximum payload
1540         * as initial MTU
1541         */
1542        max_mtu = (1 << (card->max_receive + 1))
1543                  - sizeof(struct rfc2734_header) - IEEE1394_GASP_HDR_SIZE;
1544        net->mtu = min(1500U, max_mtu);
1545
1546        /* Set our hardware address while we're at it */
1547        put_unaligned_be64(card->guid, net->dev_addr);
1548        put_unaligned_be64(~0ULL, net->broadcast);
1549        ret = register_netdev(net);
1550        if (ret)
1551                goto out;
1552
1553        list_add_tail(&dev->dev_link, &fwnet_device_list);
1554        dev_notice(&net->dev, "IPv4 over IEEE 1394 on card %s\n",
1555                   dev_name(card->device));
1556 have_dev:
1557        ret = fwnet_add_peer(dev, unit, device);
1558        if (ret && allocated_netdev) {
1559                unregister_netdev(net);
1560                list_del(&dev->dev_link);
1561        }
1562 out:
1563        if (ret && allocated_netdev)
1564                free_netdev(net);
1565
1566        mutex_unlock(&fwnet_device_mutex);
1567
1568        return ret;
1569}
1570
1571static void fwnet_remove_peer(struct fwnet_peer *peer, struct fwnet_device *dev)
1572{
1573        struct fwnet_partial_datagram *pd, *pd_next;
1574
1575        spin_lock_irq(&dev->lock);
1576        list_del(&peer->peer_link);
1577        dev->peer_count--;
1578        set_carrier_state(dev);
1579        spin_unlock_irq(&dev->lock);
1580
1581        list_for_each_entry_safe(pd, pd_next, &peer->pd_list, pd_link)
1582                fwnet_pd_delete(pd);
1583
1584        kfree(peer);
1585}
1586
1587static int fwnet_remove(struct device *_dev)
1588{
1589        struct fwnet_peer *peer = dev_get_drvdata(_dev);
1590        struct fwnet_device *dev = peer->dev;
1591        struct net_device *net;
1592        int i;
1593
1594        mutex_lock(&fwnet_device_mutex);
1595
1596        net = dev->netdev;
1597        if (net && peer->ip)
1598                arp_invalidate(net, peer->ip);
1599
1600        fwnet_remove_peer(peer, dev);
1601
1602        if (list_empty(&dev->peer_list)) {
1603                unregister_netdev(net);
1604
1605                if (dev->local_fifo != FWNET_NO_FIFO_ADDR)
1606                        fw_core_remove_address_handler(&dev->handler);
1607                if (dev->broadcast_rcv_context) {
1608                        fw_iso_context_stop(dev->broadcast_rcv_context);
1609                        fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer,
1610                                              dev->card);
1611                        fw_iso_context_destroy(dev->broadcast_rcv_context);
1612                }
1613                for (i = 0; dev->queued_datagrams && i < 5; i++)
1614                        ssleep(1);
1615                WARN_ON(dev->queued_datagrams);
1616                list_del(&dev->dev_link);
1617
1618                free_netdev(net);
1619        }
1620
1621        mutex_unlock(&fwnet_device_mutex);
1622
1623        return 0;
1624}
1625
1626/*
1627 * FIXME abort partially sent fragmented datagrams,
1628 * discard partially received fragmented datagrams
1629 */
1630static void fwnet_update(struct fw_unit *unit)
1631{
1632        struct fw_device *device = fw_parent_device(unit);
1633        struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1634        int generation;
1635
1636        generation = device->generation;
1637
1638        spin_lock_irq(&peer->dev->lock);
1639        peer->node_id    = device->node_id;
1640        peer->generation = generation;
1641        spin_unlock_irq(&peer->dev->lock);
1642}
1643
1644static const struct ieee1394_device_id fwnet_id_table[] = {
1645        {
1646                .match_flags  = IEEE1394_MATCH_SPECIFIER_ID |
1647                                IEEE1394_MATCH_VERSION,
1648                .specifier_id = IANA_SPECIFIER_ID,
1649                .version      = RFC2734_SW_VERSION,
1650        },
1651        { }
1652};
1653
1654static struct fw_driver fwnet_driver = {
1655        .driver = {
1656                .owner  = THIS_MODULE,
1657                .name   = KBUILD_MODNAME,
1658                .bus    = &fw_bus_type,
1659                .probe  = fwnet_probe,
1660                .remove = fwnet_remove,
1661        },
1662        .update   = fwnet_update,
1663        .id_table = fwnet_id_table,
1664};
1665
1666static const u32 rfc2374_unit_directory_data[] = {
1667        0x00040000,     /* directory_length             */
1668        0x1200005e,     /* unit_specifier_id: IANA      */
1669        0x81000003,     /* textual descriptor offset    */
1670        0x13000001,     /* unit_sw_version: RFC 2734    */
1671        0x81000005,     /* textual descriptor offset    */
1672        0x00030000,     /* descriptor_length            */
1673        0x00000000,     /* text                         */
1674        0x00000000,     /* minimal ASCII, en            */
1675        0x49414e41,     /* I A N A                      */
1676        0x00030000,     /* descriptor_length            */
1677        0x00000000,     /* text                         */
1678        0x00000000,     /* minimal ASCII, en            */
1679        0x49507634,     /* I P v 4                      */
1680};
1681
1682static struct fw_descriptor rfc2374_unit_directory = {
1683        .length = ARRAY_SIZE(rfc2374_unit_directory_data),
1684        .key    = (CSR_DIRECTORY | CSR_UNIT) << 24,
1685        .data   = rfc2374_unit_directory_data
1686};
1687
1688static int __init fwnet_init(void)
1689{
1690        int err;
1691
1692        err = fw_core_add_descriptor(&rfc2374_unit_directory);
1693        if (err)
1694                return err;
1695
1696        fwnet_packet_task_cache = kmem_cache_create("packet_task",
1697                        sizeof(struct fwnet_packet_task), 0, 0, NULL);
1698        if (!fwnet_packet_task_cache) {
1699                err = -ENOMEM;
1700                goto out;
1701        }
1702
1703        err = driver_register(&fwnet_driver.driver);
1704        if (!err)
1705                return 0;
1706
1707        kmem_cache_destroy(fwnet_packet_task_cache);
1708out:
1709        fw_core_remove_descriptor(&rfc2374_unit_directory);
1710
1711        return err;
1712}
1713module_init(fwnet_init);
1714
1715static void __exit fwnet_cleanup(void)
1716{
1717        driver_unregister(&fwnet_driver.driver);
1718        kmem_cache_destroy(fwnet_packet_task_cache);
1719        fw_core_remove_descriptor(&rfc2374_unit_directory);
1720}
1721module_exit(fwnet_cleanup);
1722
1723MODULE_AUTHOR("Jay Fenlason <fenlason@redhat.com>");
1724MODULE_DESCRIPTION("IPv4 over IEEE1394 as per RFC 2734");
1725MODULE_LICENSE("GPL");
1726MODULE_DEVICE_TABLE(ieee1394, fwnet_id_table);
1727
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