1 /* 2 * IPv4 over IEEE 1394, per RFC 2734 3 * IPv6 over IEEE 1394, per RFC 3146 4 * 5 * Copyright (C) 2009 Jay Fenlason <fenlason@redhat.com> 6 * 7 * based on eth1394 by Ben Collins et al 8 */ 9 10 #include <linux/bug.h> 11 #include <linux/compiler.h> 12 #include <linux/delay.h> 13 #include <linux/device.h> 14 #include <linux/ethtool.h> 15 #include <linux/firewire.h> 16 #include <linux/firewire-constants.h> 17 #include <linux/highmem.h> 18 #include <linux/in.h> 19 #include <linux/ip.h> 20 #include <linux/jiffies.h> 21 #include <linux/mod_devicetable.h> 22 #include <linux/module.h> 23 #include <linux/moduleparam.h> 24 #include <linux/mutex.h> 25 #include <linux/netdevice.h> 26 #include <linux/skbuff.h> 27 #include <linux/slab.h> 28 #include <linux/spinlock.h> 29 30 #include <asm/unaligned.h> 31 #include <net/arp.h> 32 #include <net/firewire.h> 33 34 /* rx limits */ 35 #define FWNET_MAX_FRAGMENTS 30 /* arbitrary, > TX queue depth */ 36 #define FWNET_ISO_PAGE_COUNT (PAGE_SIZE < 16*1024 ? 4 : 2) 37 38 /* tx limits */ 39 #define FWNET_MAX_QUEUED_DATAGRAMS 20 /* < 64 = number of tlabels */ 40 #define FWNET_MIN_QUEUED_DATAGRAMS 10 /* should keep AT DMA busy enough */ 41 #define FWNET_TX_QUEUE_LEN FWNET_MAX_QUEUED_DATAGRAMS /* ? */ 42 43 #define IEEE1394_BROADCAST_CHANNEL 31 44 #define IEEE1394_ALL_NODES (0xffc0 | 0x003f) 45 #define IEEE1394_MAX_PAYLOAD_S100 512 46 #define FWNET_NO_FIFO_ADDR (~0ULL) 47 48 #define IANA_SPECIFIER_ID 0x00005eU 49 #define RFC2734_SW_VERSION 0x000001U 50 #define RFC3146_SW_VERSION 0x000002U 51 52 #define IEEE1394_GASP_HDR_SIZE 8 53 54 #define RFC2374_UNFRAG_HDR_SIZE 4 55 #define RFC2374_FRAG_HDR_SIZE 8 56 #define RFC2374_FRAG_OVERHEAD 4 57 58 #define RFC2374_HDR_UNFRAG 0 /* unfragmented */ 59 #define RFC2374_HDR_FIRSTFRAG 1 /* first fragment */ 60 #define RFC2374_HDR_LASTFRAG 2 /* last fragment */ 61 #define RFC2374_HDR_INTFRAG 3 /* interior fragment */ 62 63 static bool fwnet_hwaddr_is_multicast(u8 *ha) 64 { 65 return !!(*ha & 1); 66 } 67 68 /* IPv4 and IPv6 encapsulation header */ 69 struct rfc2734_header { 70 u32 w0; 71 u32 w1; 72 }; 73 74 #define fwnet_get_hdr_lf(h) (((h)->w0 & 0xc0000000) >> 30) 75 #define fwnet_get_hdr_ether_type(h) (((h)->w0 & 0x0000ffff)) 76 #define fwnet_get_hdr_dg_size(h) (((h)->w0 & 0x0fff0000) >> 16) 77 #define fwnet_get_hdr_fg_off(h) (((h)->w0 & 0x00000fff)) 78 #define fwnet_get_hdr_dgl(h) (((h)->w1 & 0xffff0000) >> 16) 79 80 #define fwnet_set_hdr_lf(lf) ((lf) << 30) 81 #define fwnet_set_hdr_ether_type(et) (et) 82 #define fwnet_set_hdr_dg_size(dgs) ((dgs) << 16) 83 #define fwnet_set_hdr_fg_off(fgo) (fgo) 84 85 #define fwnet_set_hdr_dgl(dgl) ((dgl) << 16) 86 87 static inline void fwnet_make_uf_hdr(struct rfc2734_header *hdr, 88 unsigned ether_type) 89 { 90 hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_UNFRAG) 91 | fwnet_set_hdr_ether_type(ether_type); 92 } 93 94 static inline void fwnet_make_ff_hdr(struct rfc2734_header *hdr, 95 unsigned ether_type, unsigned dg_size, unsigned dgl) 96 { 97 hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_FIRSTFRAG) 98 | fwnet_set_hdr_dg_size(dg_size) 99 | fwnet_set_hdr_ether_type(ether_type); 100 hdr->w1 = fwnet_set_hdr_dgl(dgl); 101 } 102 103 static inline void fwnet_make_sf_hdr(struct rfc2734_header *hdr, 104 unsigned lf, unsigned dg_size, unsigned fg_off, unsigned dgl) 105 { 106 hdr->w0 = fwnet_set_hdr_lf(lf) 107 | fwnet_set_hdr_dg_size(dg_size) 108 | fwnet_set_hdr_fg_off(fg_off); 109 hdr->w1 = fwnet_set_hdr_dgl(dgl); 110 } 111 112 /* This list keeps track of what parts of the datagram have been filled in */ 113 struct fwnet_fragment_info { 114 struct list_head fi_link; 115 u16 offset; 116 u16 len; 117 }; 118 119 struct fwnet_partial_datagram { 120 struct list_head pd_link; 121 struct list_head fi_list; 122 struct sk_buff *skb; 123 /* FIXME Why not use skb->data? */ 124 char *pbuf; 125 u16 datagram_label; 126 u16 ether_type; 127 u16 datagram_size; 128 }; 129 130 static DEFINE_MUTEX(fwnet_device_mutex); 131 static LIST_HEAD(fwnet_device_list); 132 133 struct fwnet_device { 134 struct list_head dev_link; 135 spinlock_t lock; 136 enum { 137 FWNET_BROADCAST_ERROR, 138 FWNET_BROADCAST_RUNNING, 139 FWNET_BROADCAST_STOPPED, 140 } broadcast_state; 141 struct fw_iso_context *broadcast_rcv_context; 142 struct fw_iso_buffer broadcast_rcv_buffer; 143 void **broadcast_rcv_buffer_ptrs; 144 unsigned broadcast_rcv_next_ptr; 145 unsigned num_broadcast_rcv_ptrs; 146 unsigned rcv_buffer_size; 147 /* 148 * This value is the maximum unfragmented datagram size that can be 149 * sent by the hardware. It already has the GASP overhead and the 150 * unfragmented datagram header overhead calculated into it. 151 */ 152 unsigned broadcast_xmt_max_payload; 153 u16 broadcast_xmt_datagramlabel; 154 155 /* 156 * The CSR address that remote nodes must send datagrams to for us to 157 * receive them. 158 */ 159 struct fw_address_handler handler; 160 u64 local_fifo; 161 162 /* Number of tx datagrams that have been queued but not yet acked */ 163 int queued_datagrams; 164 165 int peer_count; 166 struct list_head peer_list; 167 struct fw_card *card; 168 struct net_device *netdev; 169 }; 170 171 struct fwnet_peer { 172 struct list_head peer_link; 173 struct fwnet_device *dev; 174 u64 guid; 175 176 /* guarded by dev->lock */ 177 struct list_head pd_list; /* received partial datagrams */ 178 unsigned pdg_size; /* pd_list size */ 179 180 u16 datagram_label; /* outgoing datagram label */ 181 u16 max_payload; /* includes RFC2374_FRAG_HDR_SIZE overhead */ 182 int node_id; 183 int generation; 184 unsigned speed; 185 }; 186 187 /* This is our task struct. It's used for the packet complete callback. */ 188 struct fwnet_packet_task { 189 struct fw_transaction transaction; 190 struct rfc2734_header hdr; 191 struct sk_buff *skb; 192 struct fwnet_device *dev; 193 194 int outstanding_pkts; 195 u64 fifo_addr; 196 u16 dest_node; 197 u16 max_payload; 198 u8 generation; 199 u8 speed; 200 u8 enqueued; 201 }; 202 203 /* 204 * Get fifo address embedded in hwaddr 205 */ 206 static __u64 fwnet_hwaddr_fifo(union fwnet_hwaddr *ha) 207 { 208 return (u64)get_unaligned_be16(&ha->uc.fifo_hi) << 32 209 | get_unaligned_be32(&ha->uc.fifo_lo); 210 } 211 212 /* 213 * saddr == NULL means use device source address. 214 * daddr == NULL means leave destination address (eg unresolved arp). 215 */ 216 static int fwnet_header_create(struct sk_buff *skb, struct net_device *net, 217 unsigned short type, const void *daddr, 218 const void *saddr, unsigned len) 219 { 220 struct fwnet_header *h; 221 222 h = (struct fwnet_header *)skb_push(skb, sizeof(*h)); 223 put_unaligned_be16(type, &h->h_proto); 224 225 if (net->flags & (IFF_LOOPBACK | IFF_NOARP)) { 226 memset(h->h_dest, 0, net->addr_len); 227 228 return net->hard_header_len; 229 } 230 231 if (daddr) { 232 memcpy(h->h_dest, daddr, net->addr_len); 233 234 return net->hard_header_len; 235 } 236 237 return -net->hard_header_len; 238 } 239 240 static int fwnet_header_rebuild(struct sk_buff *skb) 241 { 242 struct fwnet_header *h = (struct fwnet_header *)skb->data; 243 244 if (get_unaligned_be16(&h->h_proto) == ETH_P_IP) 245 return arp_find((unsigned char *)&h->h_dest, skb); 246 247 dev_notice(&skb->dev->dev, "unable to resolve type %04x addresses\n", 248 be16_to_cpu(h->h_proto)); 249 return 0; 250 } 251 252 static int fwnet_header_cache(const struct neighbour *neigh, 253 struct hh_cache *hh, __be16 type) 254 { 255 struct net_device *net; 256 struct fwnet_header *h; 257 258 if (type == cpu_to_be16(ETH_P_802_3)) 259 return -1; 260 net = neigh->dev; 261 h = (struct fwnet_header *)((u8 *)hh->hh_data + HH_DATA_OFF(sizeof(*h))); 262 h->h_proto = type; 263 memcpy(h->h_dest, neigh->ha, net->addr_len); 264 hh->hh_len = FWNET_HLEN; 265 266 return 0; 267 } 268 269 /* Called by Address Resolution module to notify changes in address. */ 270 static void fwnet_header_cache_update(struct hh_cache *hh, 271 const struct net_device *net, const unsigned char *haddr) 272 { 273 memcpy((u8 *)hh->hh_data + HH_DATA_OFF(FWNET_HLEN), haddr, net->addr_len); 274 } 275 276 static int fwnet_header_parse(const struct sk_buff *skb, unsigned char *haddr) 277 { 278 memcpy(haddr, skb->dev->dev_addr, FWNET_ALEN); 279 280 return FWNET_ALEN; 281 } 282 283 static const struct header_ops fwnet_header_ops = { 284 .create = fwnet_header_create, 285 .rebuild = fwnet_header_rebuild, 286 .cache = fwnet_header_cache, 287 .cache_update = fwnet_header_cache_update, 288 .parse = fwnet_header_parse, 289 }; 290 291 /* FIXME: is this correct for all cases? */ 292 static bool fwnet_frag_overlap(struct fwnet_partial_datagram *pd, 293 unsigned offset, unsigned len) 294 { 295 struct fwnet_fragment_info *fi; 296 unsigned end = offset + len; 297 298 list_for_each_entry(fi, &pd->fi_list, fi_link) 299 if (offset < fi->offset + fi->len && end > fi->offset) 300 return true; 301 302 return false; 303 } 304 305 /* Assumes that new fragment does not overlap any existing fragments */ 306 static struct fwnet_fragment_info *fwnet_frag_new( 307 struct fwnet_partial_datagram *pd, unsigned offset, unsigned len) 308 { 309 struct fwnet_fragment_info *fi, *fi2, *new; 310 struct list_head *list; 311 312 list = &pd->fi_list; 313 list_for_each_entry(fi, &pd->fi_list, fi_link) { 314 if (fi->offset + fi->len == offset) { 315 /* The new fragment can be tacked on to the end */ 316 /* Did the new fragment plug a hole? */ 317 fi2 = list_entry(fi->fi_link.next, 318 struct fwnet_fragment_info, fi_link); 319 if (fi->offset + fi->len == fi2->offset) { 320 /* glue fragments together */ 321 fi->len += len + fi2->len; 322 list_del(&fi2->fi_link); 323 kfree(fi2); 324 } else { 325 fi->len += len; 326 } 327 328 return fi; 329 } 330 if (offset + len == fi->offset) { 331 /* The new fragment can be tacked on to the beginning */ 332 /* Did the new fragment plug a hole? */ 333 fi2 = list_entry(fi->fi_link.prev, 334 struct fwnet_fragment_info, fi_link); 335 if (fi2->offset + fi2->len == fi->offset) { 336 /* glue fragments together */ 337 fi2->len += fi->len + len; 338 list_del(&fi->fi_link); 339 kfree(fi); 340 341 return fi2; 342 } 343 fi->offset = offset; 344 fi->len += len; 345 346 return fi; 347 } 348 if (offset > fi->offset + fi->len) { 349 list = &fi->fi_link; 350 break; 351 } 352 if (offset + len < fi->offset) { 353 list = fi->fi_link.prev; 354 break; 355 } 356 } 357 358 new = kmalloc(sizeof(*new), GFP_ATOMIC); 359 if (!new) 360 return NULL; 361 362 new->offset = offset; 363 new->len = len; 364 list_add(&new->fi_link, list); 365 366 return new; 367 } 368 369 static struct fwnet_partial_datagram *fwnet_pd_new(struct net_device *net, 370 struct fwnet_peer *peer, u16 datagram_label, unsigned dg_size, 371 void *frag_buf, unsigned frag_off, unsigned frag_len) 372 { 373 struct fwnet_partial_datagram *new; 374 struct fwnet_fragment_info *fi; 375 376 new = kmalloc(sizeof(*new), GFP_ATOMIC); 377 if (!new) 378 goto fail; 379 380 INIT_LIST_HEAD(&new->fi_list); 381 fi = fwnet_frag_new(new, frag_off, frag_len); 382 if (fi == NULL) 383 goto fail_w_new; 384 385 new->datagram_label = datagram_label; 386 new->datagram_size = dg_size; 387 new->skb = dev_alloc_skb(dg_size + LL_RESERVED_SPACE(net)); 388 if (new->skb == NULL) 389 goto fail_w_fi; 390 391 skb_reserve(new->skb, LL_RESERVED_SPACE(net)); 392 new->pbuf = skb_put(new->skb, dg_size); 393 memcpy(new->pbuf + frag_off, frag_buf, frag_len); 394 list_add_tail(&new->pd_link, &peer->pd_list); 395 396 return new; 397 398 fail_w_fi: 399 kfree(fi); 400 fail_w_new: 401 kfree(new); 402 fail: 403 return NULL; 404 } 405 406 static struct fwnet_partial_datagram *fwnet_pd_find(struct fwnet_peer *peer, 407 u16 datagram_label) 408 { 409 struct fwnet_partial_datagram *pd; 410 411 list_for_each_entry(pd, &peer->pd_list, pd_link) 412 if (pd->datagram_label == datagram_label) 413 return pd; 414 415 return NULL; 416 } 417 418 419 static void fwnet_pd_delete(struct fwnet_partial_datagram *old) 420 { 421 struct fwnet_fragment_info *fi, *n; 422 423 list_for_each_entry_safe(fi, n, &old->fi_list, fi_link) 424 kfree(fi); 425 426 list_del(&old->pd_link); 427 dev_kfree_skb_any(old->skb); 428 kfree(old); 429 } 430 431 static bool fwnet_pd_update(struct fwnet_peer *peer, 432 struct fwnet_partial_datagram *pd, void *frag_buf, 433 unsigned frag_off, unsigned frag_len) 434 { 435 if (fwnet_frag_new(pd, frag_off, frag_len) == NULL) 436 return false; 437 438 memcpy(pd->pbuf + frag_off, frag_buf, frag_len); 439 440 /* 441 * Move list entry to beginning of list so that oldest partial 442 * datagrams percolate to the end of the list 443 */ 444 list_move_tail(&pd->pd_link, &peer->pd_list); 445 446 return true; 447 } 448 449 static bool fwnet_pd_is_complete(struct fwnet_partial_datagram *pd) 450 { 451 struct fwnet_fragment_info *fi; 452 453 fi = list_entry(pd->fi_list.next, struct fwnet_fragment_info, fi_link); 454 455 return fi->len == pd->datagram_size; 456 } 457 458 /* caller must hold dev->lock */ 459 static struct fwnet_peer *fwnet_peer_find_by_guid(struct fwnet_device *dev, 460 u64 guid) 461 { 462 struct fwnet_peer *peer; 463 464 list_for_each_entry(peer, &dev->peer_list, peer_link) 465 if (peer->guid == guid) 466 return peer; 467 468 return NULL; 469 } 470 471 /* caller must hold dev->lock */ 472 static struct fwnet_peer *fwnet_peer_find_by_node_id(struct fwnet_device *dev, 473 int node_id, int generation) 474 { 475 struct fwnet_peer *peer; 476 477 list_for_each_entry(peer, &dev->peer_list, peer_link) 478 if (peer->node_id == node_id && 479 peer->generation == generation) 480 return peer; 481 482 return NULL; 483 } 484 485 /* See IEEE 1394-2008 table 6-4, table 8-8, table 16-18. */ 486 static unsigned fwnet_max_payload(unsigned max_rec, unsigned speed) 487 { 488 max_rec = min(max_rec, speed + 8); 489 max_rec = clamp(max_rec, 8U, 11U); /* 512...4096 */ 490 491 return (1 << (max_rec + 1)) - RFC2374_FRAG_HDR_SIZE; 492 } 493 494 495 static int fwnet_finish_incoming_packet(struct net_device *net, 496 struct sk_buff *skb, u16 source_node_id, 497 bool is_broadcast, u16 ether_type) 498 { 499 struct fwnet_device *dev; 500 int status; 501 __be64 guid; 502 503 switch (ether_type) { 504 case ETH_P_ARP: 505 case ETH_P_IP: 506 #if IS_ENABLED(CONFIG_IPV6) 507 case ETH_P_IPV6: 508 #endif 509 break; 510 default: 511 goto err; 512 } 513 514 dev = netdev_priv(net); 515 /* Write metadata, and then pass to the receive level */ 516 skb->dev = net; 517 skb->ip_summed = CHECKSUM_NONE; 518 519 /* 520 * Parse the encapsulation header. This actually does the job of 521 * converting to an ethernet-like pseudo frame header. 522 */ 523 guid = cpu_to_be64(dev->card->guid); 524 if (dev_hard_header(skb, net, ether_type, 525 is_broadcast ? net->broadcast : net->dev_addr, 526 NULL, skb->len) >= 0) { 527 struct fwnet_header *eth; 528 u16 *rawp; 529 __be16 protocol; 530 531 skb_reset_mac_header(skb); 532 skb_pull(skb, sizeof(*eth)); 533 eth = (struct fwnet_header *)skb_mac_header(skb); 534 if (fwnet_hwaddr_is_multicast(eth->h_dest)) { 535 if (memcmp(eth->h_dest, net->broadcast, 536 net->addr_len) == 0) 537 skb->pkt_type = PACKET_BROADCAST; 538 #if 0 539 else 540 skb->pkt_type = PACKET_MULTICAST; 541 #endif 542 } else { 543 if (memcmp(eth->h_dest, net->dev_addr, net->addr_len)) 544 skb->pkt_type = PACKET_OTHERHOST; 545 } 546 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN) { 547 protocol = eth->h_proto; 548 } else { 549 rawp = (u16 *)skb->data; 550 if (*rawp == 0xffff) 551 protocol = htons(ETH_P_802_3); 552 else 553 protocol = htons(ETH_P_802_2); 554 } 555 skb->protocol = protocol; 556 } 557 status = netif_rx(skb); 558 if (status == NET_RX_DROP) { 559 net->stats.rx_errors++; 560 net->stats.rx_dropped++; 561 } else { 562 net->stats.rx_packets++; 563 net->stats.rx_bytes += skb->len; 564 } 565 566 return 0; 567 568 err: 569 net->stats.rx_errors++; 570 net->stats.rx_dropped++; 571 572 dev_kfree_skb_any(skb); 573 574 return -ENOENT; 575 } 576 577 static int fwnet_incoming_packet(struct fwnet_device *dev, __be32 *buf, int len, 578 int source_node_id, int generation, 579 bool is_broadcast) 580 { 581 struct sk_buff *skb; 582 struct net_device *net = dev->netdev; 583 struct rfc2734_header hdr; 584 unsigned lf; 585 unsigned long flags; 586 struct fwnet_peer *peer; 587 struct fwnet_partial_datagram *pd; 588 int fg_off; 589 int dg_size; 590 u16 datagram_label; 591 int retval; 592 u16 ether_type; 593 594 hdr.w0 = be32_to_cpu(buf[0]); 595 lf = fwnet_get_hdr_lf(&hdr); 596 if (lf == RFC2374_HDR_UNFRAG) { 597 /* 598 * An unfragmented datagram has been received by the ieee1394 599 * bus. Build an skbuff around it so we can pass it to the 600 * high level network layer. 601 */ 602 ether_type = fwnet_get_hdr_ether_type(&hdr); 603 buf++; 604 len -= RFC2374_UNFRAG_HDR_SIZE; 605 606 skb = dev_alloc_skb(len + LL_RESERVED_SPACE(net)); 607 if (unlikely(!skb)) { 608 net->stats.rx_dropped++; 609 610 return -ENOMEM; 611 } 612 skb_reserve(skb, LL_RESERVED_SPACE(net)); 613 memcpy(skb_put(skb, len), buf, len); 614 615 return fwnet_finish_incoming_packet(net, skb, source_node_id, 616 is_broadcast, ether_type); 617 } 618 /* A datagram fragment has been received, now the fun begins. */ 619 hdr.w1 = ntohl(buf[1]); 620 buf += 2; 621 len -= RFC2374_FRAG_HDR_SIZE; 622 if (lf == RFC2374_HDR_FIRSTFRAG) { 623 ether_type = fwnet_get_hdr_ether_type(&hdr); 624 fg_off = 0; 625 } else { 626 ether_type = 0; 627 fg_off = fwnet_get_hdr_fg_off(&hdr); 628 } 629 datagram_label = fwnet_get_hdr_dgl(&hdr); 630 dg_size = fwnet_get_hdr_dg_size(&hdr); /* ??? + 1 */ 631 632 spin_lock_irqsave(&dev->lock, flags); 633 634 peer = fwnet_peer_find_by_node_id(dev, source_node_id, generation); 635 if (!peer) { 636 retval = -ENOENT; 637 goto fail; 638 } 639 640 pd = fwnet_pd_find(peer, datagram_label); 641 if (pd == NULL) { 642 while (peer->pdg_size >= FWNET_MAX_FRAGMENTS) { 643 /* remove the oldest */ 644 fwnet_pd_delete(list_first_entry(&peer->pd_list, 645 struct fwnet_partial_datagram, pd_link)); 646 peer->pdg_size--; 647 } 648 pd = fwnet_pd_new(net, peer, datagram_label, 649 dg_size, buf, fg_off, len); 650 if (pd == NULL) { 651 retval = -ENOMEM; 652 goto fail; 653 } 654 peer->pdg_size++; 655 } else { 656 if (fwnet_frag_overlap(pd, fg_off, len) || 657 pd->datagram_size != dg_size) { 658 /* 659 * Differing datagram sizes or overlapping fragments, 660 * discard old datagram and start a new one. 661 */ 662 fwnet_pd_delete(pd); 663 pd = fwnet_pd_new(net, peer, datagram_label, 664 dg_size, buf, fg_off, len); 665 if (pd == NULL) { 666 peer->pdg_size--; 667 retval = -ENOMEM; 668 goto fail; 669 } 670 } else { 671 if (!fwnet_pd_update(peer, pd, buf, fg_off, len)) { 672 /* 673 * Couldn't save off fragment anyway 674 * so might as well obliterate the 675 * datagram now. 676 */ 677 fwnet_pd_delete(pd); 678 peer->pdg_size--; 679 retval = -ENOMEM; 680 goto fail; 681 } 682 } 683 } /* new datagram or add to existing one */ 684 685 if (lf == RFC2374_HDR_FIRSTFRAG) 686 pd->ether_type = ether_type; 687 688 if (fwnet_pd_is_complete(pd)) { 689 ether_type = pd->ether_type; 690 peer->pdg_size--; 691 skb = skb_get(pd->skb); 692 fwnet_pd_delete(pd); 693 694 spin_unlock_irqrestore(&dev->lock, flags); 695 696 return fwnet_finish_incoming_packet(net, skb, source_node_id, 697 false, ether_type); 698 } 699 /* 700 * Datagram is not complete, we're done for the 701 * moment. 702 */ 703 retval = 0; 704 fail: 705 spin_unlock_irqrestore(&dev->lock, flags); 706 707 return retval; 708 } 709 710 static void fwnet_receive_packet(struct fw_card *card, struct fw_request *r, 711 int tcode, int destination, int source, int generation, 712 unsigned long long offset, void *payload, size_t length, 713 void *callback_data) 714 { 715 struct fwnet_device *dev = callback_data; 716 int rcode; 717 718 if (destination == IEEE1394_ALL_NODES) { 719 kfree(r); 720 721 return; 722 } 723 724 if (offset != dev->handler.offset) 725 rcode = RCODE_ADDRESS_ERROR; 726 else if (tcode != TCODE_WRITE_BLOCK_REQUEST) 727 rcode = RCODE_TYPE_ERROR; 728 else if (fwnet_incoming_packet(dev, payload, length, 729 source, generation, false) != 0) { 730 dev_err(&dev->netdev->dev, "incoming packet failure\n"); 731 rcode = RCODE_CONFLICT_ERROR; 732 } else 733 rcode = RCODE_COMPLETE; 734 735 fw_send_response(card, r, rcode); 736 } 737 738 static void fwnet_receive_broadcast(struct fw_iso_context *context, 739 u32 cycle, size_t header_length, void *header, void *data) 740 { 741 struct fwnet_device *dev; 742 struct fw_iso_packet packet; 743 __be16 *hdr_ptr; 744 __be32 *buf_ptr; 745 int retval; 746 u32 length; 747 u16 source_node_id; 748 u32 specifier_id; 749 u32 ver; 750 unsigned long offset; 751 unsigned long flags; 752 753 dev = data; 754 hdr_ptr = header; 755 length = be16_to_cpup(hdr_ptr); 756 757 spin_lock_irqsave(&dev->lock, flags); 758 759 offset = dev->rcv_buffer_size * dev->broadcast_rcv_next_ptr; 760 buf_ptr = dev->broadcast_rcv_buffer_ptrs[dev->broadcast_rcv_next_ptr++]; 761 if (dev->broadcast_rcv_next_ptr == dev->num_broadcast_rcv_ptrs) 762 dev->broadcast_rcv_next_ptr = 0; 763 764 spin_unlock_irqrestore(&dev->lock, flags); 765 766 specifier_id = (be32_to_cpu(buf_ptr[0]) & 0xffff) << 8 767 | (be32_to_cpu(buf_ptr[1]) & 0xff000000) >> 24; 768 ver = be32_to_cpu(buf_ptr[1]) & 0xffffff; 769 source_node_id = be32_to_cpu(buf_ptr[0]) >> 16; 770 771 if (specifier_id == IANA_SPECIFIER_ID && 772 (ver == RFC2734_SW_VERSION 773 #if IS_ENABLED(CONFIG_IPV6) 774 || ver == RFC3146_SW_VERSION 775 #endif 776 )) { 777 buf_ptr += 2; 778 length -= IEEE1394_GASP_HDR_SIZE; 779 fwnet_incoming_packet(dev, buf_ptr, length, source_node_id, 780 context->card->generation, true); 781 } 782 783 packet.payload_length = dev->rcv_buffer_size; 784 packet.interrupt = 1; 785 packet.skip = 0; 786 packet.tag = 3; 787 packet.sy = 0; 788 packet.header_length = IEEE1394_GASP_HDR_SIZE; 789 790 spin_lock_irqsave(&dev->lock, flags); 791 792 retval = fw_iso_context_queue(dev->broadcast_rcv_context, &packet, 793 &dev->broadcast_rcv_buffer, offset); 794 795 spin_unlock_irqrestore(&dev->lock, flags); 796 797 if (retval >= 0) 798 fw_iso_context_queue_flush(dev->broadcast_rcv_context); 799 else 800 dev_err(&dev->netdev->dev, "requeue failed\n"); 801 } 802 803 static struct kmem_cache *fwnet_packet_task_cache; 804 805 static void fwnet_free_ptask(struct fwnet_packet_task *ptask) 806 { 807 dev_kfree_skb_any(ptask->skb); 808 kmem_cache_free(fwnet_packet_task_cache, ptask); 809 } 810 811 /* Caller must hold dev->lock. */ 812 static void dec_queued_datagrams(struct fwnet_device *dev) 813 { 814 if (--dev->queued_datagrams == FWNET_MIN_QUEUED_DATAGRAMS) 815 netif_wake_queue(dev->netdev); 816 } 817 818 static int fwnet_send_packet(struct fwnet_packet_task *ptask); 819 820 static void fwnet_transmit_packet_done(struct fwnet_packet_task *ptask) 821 { 822 struct fwnet_device *dev = ptask->dev; 823 struct sk_buff *skb = ptask->skb; 824 unsigned long flags; 825 bool free; 826 827 spin_lock_irqsave(&dev->lock, flags); 828 829 ptask->outstanding_pkts--; 830 831 /* Check whether we or the networking TX soft-IRQ is last user. */ 832 free = (ptask->outstanding_pkts == 0 && ptask->enqueued); 833 if (free) 834 dec_queued_datagrams(dev); 835 836 if (ptask->outstanding_pkts == 0) { 837 dev->netdev->stats.tx_packets++; 838 dev->netdev->stats.tx_bytes += skb->len; 839 } 840 841 spin_unlock_irqrestore(&dev->lock, flags); 842 843 if (ptask->outstanding_pkts > 0) { 844 u16 dg_size; 845 u16 fg_off; 846 u16 datagram_label; 847 u16 lf; 848 849 /* Update the ptask to point to the next fragment and send it */ 850 lf = fwnet_get_hdr_lf(&ptask->hdr); 851 switch (lf) { 852 case RFC2374_HDR_LASTFRAG: 853 case RFC2374_HDR_UNFRAG: 854 default: 855 dev_err(&dev->netdev->dev, 856 "outstanding packet %x lf %x, header %x,%x\n", 857 ptask->outstanding_pkts, lf, ptask->hdr.w0, 858 ptask->hdr.w1); 859 BUG(); 860 861 case RFC2374_HDR_FIRSTFRAG: 862 /* Set frag type here for future interior fragments */ 863 dg_size = fwnet_get_hdr_dg_size(&ptask->hdr); 864 fg_off = ptask->max_payload - RFC2374_FRAG_HDR_SIZE; 865 datagram_label = fwnet_get_hdr_dgl(&ptask->hdr); 866 break; 867 868 case RFC2374_HDR_INTFRAG: 869 dg_size = fwnet_get_hdr_dg_size(&ptask->hdr); 870 fg_off = fwnet_get_hdr_fg_off(&ptask->hdr) 871 + ptask->max_payload - RFC2374_FRAG_HDR_SIZE; 872 datagram_label = fwnet_get_hdr_dgl(&ptask->hdr); 873 break; 874 } 875 876 if (ptask->dest_node == IEEE1394_ALL_NODES) { 877 skb_pull(skb, 878 ptask->max_payload + IEEE1394_GASP_HDR_SIZE); 879 } else { 880 skb_pull(skb, ptask->max_payload); 881 } 882 if (ptask->outstanding_pkts > 1) { 883 fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_INTFRAG, 884 dg_size, fg_off, datagram_label); 885 } else { 886 fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_LASTFRAG, 887 dg_size, fg_off, datagram_label); 888 ptask->max_payload = skb->len + RFC2374_FRAG_HDR_SIZE; 889 } 890 fwnet_send_packet(ptask); 891 } 892 893 if (free) 894 fwnet_free_ptask(ptask); 895 } 896 897 static void fwnet_transmit_packet_failed(struct fwnet_packet_task *ptask) 898 { 899 struct fwnet_device *dev = ptask->dev; 900 unsigned long flags; 901 bool free; 902 903 spin_lock_irqsave(&dev->lock, flags); 904 905 /* One fragment failed; don't try to send remaining fragments. */ 906 ptask->outstanding_pkts = 0; 907 908 /* Check whether we or the networking TX soft-IRQ is last user. */ 909 free = ptask->enqueued; 910 if (free) 911 dec_queued_datagrams(dev); 912 913 dev->netdev->stats.tx_dropped++; 914 dev->netdev->stats.tx_errors++; 915 916 spin_unlock_irqrestore(&dev->lock, flags); 917 918 if (free) 919 fwnet_free_ptask(ptask); 920 } 921 922 static void fwnet_write_complete(struct fw_card *card, int rcode, 923 void *payload, size_t length, void *data) 924 { 925 struct fwnet_packet_task *ptask = data; 926 static unsigned long j; 927 static int last_rcode, errors_skipped; 928 929 if (rcode == RCODE_COMPLETE) { 930 fwnet_transmit_packet_done(ptask); 931 } else { 932 if (printk_timed_ratelimit(&j, 1000) || rcode != last_rcode) { 933 dev_err(&ptask->dev->netdev->dev, 934 "fwnet_write_complete failed: %x (skipped %d)\n", 935 rcode, errors_skipped); 936 937 errors_skipped = 0; 938 last_rcode = rcode; 939 } else { 940 errors_skipped++; 941 } 942 fwnet_transmit_packet_failed(ptask); 943 } 944 } 945 946 static int fwnet_send_packet(struct fwnet_packet_task *ptask) 947 { 948 struct fwnet_device *dev; 949 unsigned tx_len; 950 struct rfc2734_header *bufhdr; 951 unsigned long flags; 952 bool free; 953 954 dev = ptask->dev; 955 tx_len = ptask->max_payload; 956 switch (fwnet_get_hdr_lf(&ptask->hdr)) { 957 case RFC2374_HDR_UNFRAG: 958 bufhdr = (struct rfc2734_header *) 959 skb_push(ptask->skb, RFC2374_UNFRAG_HDR_SIZE); 960 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0); 961 break; 962 963 case RFC2374_HDR_FIRSTFRAG: 964 case RFC2374_HDR_INTFRAG: 965 case RFC2374_HDR_LASTFRAG: 966 bufhdr = (struct rfc2734_header *) 967 skb_push(ptask->skb, RFC2374_FRAG_HDR_SIZE); 968 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0); 969 put_unaligned_be32(ptask->hdr.w1, &bufhdr->w1); 970 break; 971 972 default: 973 BUG(); 974 } 975 if (ptask->dest_node == IEEE1394_ALL_NODES) { 976 u8 *p; 977 int generation; 978 int node_id; 979 unsigned int sw_version; 980 981 /* ptask->generation may not have been set yet */ 982 generation = dev->card->generation; 983 smp_rmb(); 984 node_id = dev->card->node_id; 985 986 switch (ptask->skb->protocol) { 987 default: 988 sw_version = RFC2734_SW_VERSION; 989 break; 990 #if IS_ENABLED(CONFIG_IPV6) 991 case htons(ETH_P_IPV6): 992 sw_version = RFC3146_SW_VERSION; 993 #endif 994 } 995 996 p = skb_push(ptask->skb, IEEE1394_GASP_HDR_SIZE); 997 put_unaligned_be32(node_id << 16 | IANA_SPECIFIER_ID >> 8, p); 998 put_unaligned_be32((IANA_SPECIFIER_ID & 0xff) << 24 999 | sw_version, &p[4]); 1000 1001 /* We should not transmit if broadcast_channel.valid == 0. */ 1002 fw_send_request(dev->card, &ptask->transaction, 1003 TCODE_STREAM_DATA, 1004 fw_stream_packet_destination_id(3, 1005 IEEE1394_BROADCAST_CHANNEL, 0), 1006 generation, SCODE_100, 0ULL, ptask->skb->data, 1007 tx_len + 8, fwnet_write_complete, ptask); 1008 1009 spin_lock_irqsave(&dev->lock, flags); 1010 1011 /* If the AT tasklet already ran, we may be last user. */ 1012 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued); 1013 if (!free) 1014 ptask->enqueued = true; 1015 else 1016 dec_queued_datagrams(dev); 1017 1018 spin_unlock_irqrestore(&dev->lock, flags); 1019 1020 goto out; 1021 } 1022 1023 fw_send_request(dev->card, &ptask->transaction, 1024 TCODE_WRITE_BLOCK_REQUEST, ptask->dest_node, 1025 ptask->generation, ptask->speed, ptask->fifo_addr, 1026 ptask->skb->data, tx_len, fwnet_write_complete, ptask); 1027 1028 spin_lock_irqsave(&dev->lock, flags); 1029 1030 /* If the AT tasklet already ran, we may be last user. */ 1031 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued); 1032 if (!free) 1033 ptask->enqueued = true; 1034 else 1035 dec_queued_datagrams(dev); 1036 1037 spin_unlock_irqrestore(&dev->lock, flags); 1038 1039 dev->netdev->trans_start = jiffies; 1040 out: 1041 if (free) 1042 fwnet_free_ptask(ptask); 1043 1044 return 0; 1045 } 1046 1047 static void fwnet_fifo_stop(struct fwnet_device *dev) 1048 { 1049 if (dev->local_fifo == FWNET_NO_FIFO_ADDR) 1050 return; 1051 1052 fw_core_remove_address_handler(&dev->handler); 1053 dev->local_fifo = FWNET_NO_FIFO_ADDR; 1054 } 1055 1056 static int fwnet_fifo_start(struct fwnet_device *dev) 1057 { 1058 int retval; 1059 1060 if (dev->local_fifo != FWNET_NO_FIFO_ADDR) 1061 return 0; 1062 1063 dev->handler.length = 4096; 1064 dev->handler.address_callback = fwnet_receive_packet; 1065 dev->handler.callback_data = dev; 1066 1067 retval = fw_core_add_address_handler(&dev->handler, 1068 &fw_high_memory_region); 1069 if (retval < 0) 1070 return retval; 1071 1072 dev->local_fifo = dev->handler.offset; 1073 1074 return 0; 1075 } 1076 1077 static void __fwnet_broadcast_stop(struct fwnet_device *dev) 1078 { 1079 unsigned u; 1080 1081 if (dev->broadcast_state != FWNET_BROADCAST_ERROR) { 1082 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++) 1083 kunmap(dev->broadcast_rcv_buffer.pages[u]); 1084 fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer, dev->card); 1085 } 1086 if (dev->broadcast_rcv_context) { 1087 fw_iso_context_destroy(dev->broadcast_rcv_context); 1088 dev->broadcast_rcv_context = NULL; 1089 } 1090 kfree(dev->broadcast_rcv_buffer_ptrs); 1091 dev->broadcast_rcv_buffer_ptrs = NULL; 1092 dev->broadcast_state = FWNET_BROADCAST_ERROR; 1093 } 1094 1095 static void fwnet_broadcast_stop(struct fwnet_device *dev) 1096 { 1097 if (dev->broadcast_state == FWNET_BROADCAST_ERROR) 1098 return; 1099 fw_iso_context_stop(dev->broadcast_rcv_context); 1100 __fwnet_broadcast_stop(dev); 1101 } 1102 1103 static int fwnet_broadcast_start(struct fwnet_device *dev) 1104 { 1105 struct fw_iso_context *context; 1106 int retval; 1107 unsigned num_packets; 1108 unsigned max_receive; 1109 struct fw_iso_packet packet; 1110 unsigned long offset; 1111 void **ptrptr; 1112 unsigned u; 1113 1114 if (dev->broadcast_state != FWNET_BROADCAST_ERROR) 1115 return 0; 1116 1117 max_receive = 1U << (dev->card->max_receive + 1); 1118 num_packets = (FWNET_ISO_PAGE_COUNT * PAGE_SIZE) / max_receive; 1119 1120 ptrptr = kmalloc(sizeof(void *) * num_packets, GFP_KERNEL); 1121 if (!ptrptr) { 1122 retval = -ENOMEM; 1123 goto failed; 1124 } 1125 dev->broadcast_rcv_buffer_ptrs = ptrptr; 1126 1127 context = fw_iso_context_create(dev->card, FW_ISO_CONTEXT_RECEIVE, 1128 IEEE1394_BROADCAST_CHANNEL, 1129 dev->card->link_speed, 8, 1130 fwnet_receive_broadcast, dev); 1131 if (IS_ERR(context)) { 1132 retval = PTR_ERR(context); 1133 goto failed; 1134 } 1135 1136 retval = fw_iso_buffer_init(&dev->broadcast_rcv_buffer, dev->card, 1137 FWNET_ISO_PAGE_COUNT, DMA_FROM_DEVICE); 1138 if (retval < 0) 1139 goto failed; 1140 1141 dev->broadcast_state = FWNET_BROADCAST_STOPPED; 1142 1143 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++) { 1144 void *ptr; 1145 unsigned v; 1146 1147 ptr = kmap(dev->broadcast_rcv_buffer.pages[u]); 1148 for (v = 0; v < num_packets / FWNET_ISO_PAGE_COUNT; v++) 1149 *ptrptr++ = (void *) ((char *)ptr + v * max_receive); 1150 } 1151 dev->broadcast_rcv_context = context; 1152 1153 packet.payload_length = max_receive; 1154 packet.interrupt = 1; 1155 packet.skip = 0; 1156 packet.tag = 3; 1157 packet.sy = 0; 1158 packet.header_length = IEEE1394_GASP_HDR_SIZE; 1159 offset = 0; 1160 1161 for (u = 0; u < num_packets; u++) { 1162 retval = fw_iso_context_queue(context, &packet, 1163 &dev->broadcast_rcv_buffer, offset); 1164 if (retval < 0) 1165 goto failed; 1166 1167 offset += max_receive; 1168 } 1169 dev->num_broadcast_rcv_ptrs = num_packets; 1170 dev->rcv_buffer_size = max_receive; 1171 dev->broadcast_rcv_next_ptr = 0U; 1172 retval = fw_iso_context_start(context, -1, 0, 1173 FW_ISO_CONTEXT_MATCH_ALL_TAGS); /* ??? sync */ 1174 if (retval < 0) 1175 goto failed; 1176 1177 /* FIXME: adjust it according to the min. speed of all known peers? */ 1178 dev->broadcast_xmt_max_payload = IEEE1394_MAX_PAYLOAD_S100 1179 - IEEE1394_GASP_HDR_SIZE - RFC2374_UNFRAG_HDR_SIZE; 1180 dev->broadcast_state = FWNET_BROADCAST_RUNNING; 1181 1182 return 0; 1183 1184 failed: 1185 __fwnet_broadcast_stop(dev); 1186 return retval; 1187 } 1188 1189 static void set_carrier_state(struct fwnet_device *dev) 1190 { 1191 if (dev->peer_count > 1) 1192 netif_carrier_on(dev->netdev); 1193 else 1194 netif_carrier_off(dev->netdev); 1195 } 1196 1197 /* ifup */ 1198 static int fwnet_open(struct net_device *net) 1199 { 1200 struct fwnet_device *dev = netdev_priv(net); 1201 int ret; 1202 1203 ret = fwnet_broadcast_start(dev); 1204 if (ret) 1205 return ret; 1206 1207 netif_start_queue(net); 1208 1209 spin_lock_irq(&dev->lock); 1210 set_carrier_state(dev); 1211 spin_unlock_irq(&dev->lock); 1212 1213 return 0; 1214 } 1215 1216 /* ifdown */ 1217 static int fwnet_stop(struct net_device *net) 1218 { 1219 struct fwnet_device *dev = netdev_priv(net); 1220 1221 netif_stop_queue(net); 1222 fwnet_broadcast_stop(dev); 1223 1224 return 0; 1225 } 1226 1227 static netdev_tx_t fwnet_tx(struct sk_buff *skb, struct net_device *net) 1228 { 1229 struct fwnet_header hdr_buf; 1230 struct fwnet_device *dev = netdev_priv(net); 1231 __be16 proto; 1232 u16 dest_node; 1233 unsigned max_payload; 1234 u16 dg_size; 1235 u16 *datagram_label_ptr; 1236 struct fwnet_packet_task *ptask; 1237 struct fwnet_peer *peer; 1238 unsigned long flags; 1239 1240 spin_lock_irqsave(&dev->lock, flags); 1241 1242 /* Can this happen? */ 1243 if (netif_queue_stopped(dev->netdev)) { 1244 spin_unlock_irqrestore(&dev->lock, flags); 1245 1246 return NETDEV_TX_BUSY; 1247 } 1248 1249 ptask = kmem_cache_alloc(fwnet_packet_task_cache, GFP_ATOMIC); 1250 if (ptask == NULL) 1251 goto fail; 1252 1253 skb = skb_share_check(skb, GFP_ATOMIC); 1254 if (!skb) 1255 goto fail; 1256 1257 /* 1258 * Make a copy of the driver-specific header. 1259 * We might need to rebuild the header on tx failure. 1260 */ 1261 memcpy(&hdr_buf, skb->data, sizeof(hdr_buf)); 1262 proto = hdr_buf.h_proto; 1263 1264 switch (proto) { 1265 case htons(ETH_P_ARP): 1266 case htons(ETH_P_IP): 1267 #if IS_ENABLED(CONFIG_IPV6) 1268 case htons(ETH_P_IPV6): 1269 #endif 1270 break; 1271 default: 1272 goto fail; 1273 } 1274 1275 skb_pull(skb, sizeof(hdr_buf)); 1276 dg_size = skb->len; 1277 1278 /* 1279 * Set the transmission type for the packet. ARP packets and IP 1280 * broadcast packets are sent via GASP. 1281 */ 1282 if (fwnet_hwaddr_is_multicast(hdr_buf.h_dest)) { 1283 max_payload = dev->broadcast_xmt_max_payload; 1284 datagram_label_ptr = &dev->broadcast_xmt_datagramlabel; 1285 1286 ptask->fifo_addr = FWNET_NO_FIFO_ADDR; 1287 ptask->generation = 0; 1288 ptask->dest_node = IEEE1394_ALL_NODES; 1289 ptask->speed = SCODE_100; 1290 } else { 1291 union fwnet_hwaddr *ha = (union fwnet_hwaddr *)hdr_buf.h_dest; 1292 __be64 guid = get_unaligned(&ha->uc.uniq_id); 1293 u8 generation; 1294 1295 peer = fwnet_peer_find_by_guid(dev, be64_to_cpu(guid)); 1296 if (!peer) 1297 goto fail; 1298 1299 generation = peer->generation; 1300 dest_node = peer->node_id; 1301 max_payload = peer->max_payload; 1302 datagram_label_ptr = &peer->datagram_label; 1303 1304 ptask->fifo_addr = fwnet_hwaddr_fifo(ha); 1305 ptask->generation = generation; 1306 ptask->dest_node = dest_node; 1307 ptask->speed = peer->speed; 1308 } 1309 1310 ptask->hdr.w0 = 0; 1311 ptask->hdr.w1 = 0; 1312 ptask->skb = skb; 1313 ptask->dev = dev; 1314 1315 /* Does it all fit in one packet? */ 1316 if (dg_size <= max_payload) { 1317 fwnet_make_uf_hdr(&ptask->hdr, ntohs(proto)); 1318 ptask->outstanding_pkts = 1; 1319 max_payload = dg_size + RFC2374_UNFRAG_HDR_SIZE; 1320 } else { 1321 u16 datagram_label; 1322 1323 max_payload -= RFC2374_FRAG_OVERHEAD; 1324 datagram_label = (*datagram_label_ptr)++; 1325 fwnet_make_ff_hdr(&ptask->hdr, ntohs(proto), dg_size, 1326 datagram_label); 1327 ptask->outstanding_pkts = DIV_ROUND_UP(dg_size, max_payload); 1328 max_payload += RFC2374_FRAG_HDR_SIZE; 1329 } 1330 1331 if (++dev->queued_datagrams == FWNET_MAX_QUEUED_DATAGRAMS) 1332 netif_stop_queue(dev->netdev); 1333 1334 spin_unlock_irqrestore(&dev->lock, flags); 1335 1336 ptask->max_payload = max_payload; 1337 ptask->enqueued = 0; 1338 1339 fwnet_send_packet(ptask); 1340 1341 return NETDEV_TX_OK; 1342 1343 fail: 1344 spin_unlock_irqrestore(&dev->lock, flags); 1345 1346 if (ptask) 1347 kmem_cache_free(fwnet_packet_task_cache, ptask); 1348 1349 if (skb != NULL) 1350 dev_kfree_skb(skb); 1351 1352 net->stats.tx_dropped++; 1353 net->stats.tx_errors++; 1354 1355 /* 1356 * FIXME: According to a patch from 2003-02-26, "returning non-zero 1357 * causes serious problems" here, allegedly. Before that patch, 1358 * -ERRNO was returned which is not appropriate under Linux 2.6. 1359 * Perhaps more needs to be done? Stop the queue in serious 1360 * conditions and restart it elsewhere? 1361 */ 1362 return NETDEV_TX_OK; 1363 } 1364 1365 static int fwnet_change_mtu(struct net_device *net, int new_mtu) 1366 { 1367 if (new_mtu < 68) 1368 return -EINVAL; 1369 1370 net->mtu = new_mtu; 1371 return 0; 1372 } 1373 1374 static const struct ethtool_ops fwnet_ethtool_ops = { 1375 .get_link = ethtool_op_get_link, 1376 }; 1377 1378 static const struct net_device_ops fwnet_netdev_ops = { 1379 .ndo_open = fwnet_open, 1380 .ndo_stop = fwnet_stop, 1381 .ndo_start_xmit = fwnet_tx, 1382 .ndo_change_mtu = fwnet_change_mtu, 1383 }; 1384 1385 static void fwnet_init_dev(struct net_device *net) 1386 { 1387 net->header_ops = &fwnet_header_ops; 1388 net->netdev_ops = &fwnet_netdev_ops; 1389 net->watchdog_timeo = 2 * HZ; 1390 net->flags = IFF_BROADCAST | IFF_MULTICAST; 1391 net->features = NETIF_F_HIGHDMA; 1392 net->addr_len = FWNET_ALEN; 1393 net->hard_header_len = FWNET_HLEN; 1394 net->type = ARPHRD_IEEE1394; 1395 net->tx_queue_len = FWNET_TX_QUEUE_LEN; 1396 net->ethtool_ops = &fwnet_ethtool_ops; 1397 } 1398 1399 /* caller must hold fwnet_device_mutex */ 1400 static struct fwnet_device *fwnet_dev_find(struct fw_card *card) 1401 { 1402 struct fwnet_device *dev; 1403 1404 list_for_each_entry(dev, &fwnet_device_list, dev_link) 1405 if (dev->card == card) 1406 return dev; 1407 1408 return NULL; 1409 } 1410 1411 static int fwnet_add_peer(struct fwnet_device *dev, 1412 struct fw_unit *unit, struct fw_device *device) 1413 { 1414 struct fwnet_peer *peer; 1415 1416 peer = kmalloc(sizeof(*peer), GFP_KERNEL); 1417 if (!peer) 1418 return -ENOMEM; 1419 1420 dev_set_drvdata(&unit->device, peer); 1421 1422 peer->dev = dev; 1423 peer->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4]; 1424 INIT_LIST_HEAD(&peer->pd_list); 1425 peer->pdg_size = 0; 1426 peer->datagram_label = 0; 1427 peer->speed = device->max_speed; 1428 peer->max_payload = fwnet_max_payload(device->max_rec, peer->speed); 1429 1430 peer->generation = device->generation; 1431 smp_rmb(); 1432 peer->node_id = device->node_id; 1433 1434 spin_lock_irq(&dev->lock); 1435 list_add_tail(&peer->peer_link, &dev->peer_list); 1436 dev->peer_count++; 1437 set_carrier_state(dev); 1438 spin_unlock_irq(&dev->lock); 1439 1440 return 0; 1441 } 1442 1443 static int fwnet_probe(struct fw_unit *unit, 1444 const struct ieee1394_device_id *id) 1445 { 1446 struct fw_device *device = fw_parent_device(unit); 1447 struct fw_card *card = device->card; 1448 struct net_device *net; 1449 bool allocated_netdev = false; 1450 struct fwnet_device *dev; 1451 unsigned max_mtu; 1452 int ret; 1453 union fwnet_hwaddr *ha; 1454 1455 mutex_lock(&fwnet_device_mutex); 1456 1457 dev = fwnet_dev_find(card); 1458 if (dev) { 1459 net = dev->netdev; 1460 goto have_dev; 1461 } 1462 1463 net = alloc_netdev(sizeof(*dev), "firewire%d", fwnet_init_dev); 1464 if (net == NULL) { 1465 mutex_unlock(&fwnet_device_mutex); 1466 return -ENOMEM; 1467 } 1468 1469 allocated_netdev = true; 1470 SET_NETDEV_DEV(net, card->device); 1471 dev = netdev_priv(net); 1472 1473 spin_lock_init(&dev->lock); 1474 dev->broadcast_state = FWNET_BROADCAST_ERROR; 1475 dev->broadcast_rcv_context = NULL; 1476 dev->broadcast_xmt_max_payload = 0; 1477 dev->broadcast_xmt_datagramlabel = 0; 1478 dev->local_fifo = FWNET_NO_FIFO_ADDR; 1479 dev->queued_datagrams = 0; 1480 INIT_LIST_HEAD(&dev->peer_list); 1481 dev->card = card; 1482 dev->netdev = net; 1483 1484 ret = fwnet_fifo_start(dev); 1485 if (ret < 0) 1486 goto out; 1487 dev->local_fifo = dev->handler.offset; 1488 1489 /* 1490 * Use the RFC 2734 default 1500 octets or the maximum payload 1491 * as initial MTU 1492 */ 1493 max_mtu = (1 << (card->max_receive + 1)) 1494 - sizeof(struct rfc2734_header) - IEEE1394_GASP_HDR_SIZE; 1495 net->mtu = min(1500U, max_mtu); 1496 1497 /* Set our hardware address while we're at it */ 1498 ha = (union fwnet_hwaddr *)net->dev_addr; 1499 put_unaligned_be64(card->guid, &ha->uc.uniq_id); 1500 ha->uc.max_rec = dev->card->max_receive; 1501 ha->uc.sspd = dev->card->link_speed; 1502 put_unaligned_be16(dev->local_fifo >> 32, &ha->uc.fifo_hi); 1503 put_unaligned_be32(dev->local_fifo & 0xffffffff, &ha->uc.fifo_lo); 1504 1505 memset(net->broadcast, -1, net->addr_len); 1506 1507 ret = register_netdev(net); 1508 if (ret) 1509 goto out; 1510 1511 list_add_tail(&dev->dev_link, &fwnet_device_list); 1512 dev_notice(&net->dev, "IP over IEEE 1394 on card %s\n", 1513 dev_name(card->device)); 1514 have_dev: 1515 ret = fwnet_add_peer(dev, unit, device); 1516 if (ret && allocated_netdev) { 1517 unregister_netdev(net); 1518 list_del(&dev->dev_link); 1519 out: 1520 fwnet_fifo_stop(dev); 1521 free_netdev(net); 1522 } 1523 1524 mutex_unlock(&fwnet_device_mutex); 1525 1526 return ret; 1527 } 1528 1529 /* 1530 * FIXME abort partially sent fragmented datagrams, 1531 * discard partially received fragmented datagrams 1532 */ 1533 static void fwnet_update(struct fw_unit *unit) 1534 { 1535 struct fw_device *device = fw_parent_device(unit); 1536 struct fwnet_peer *peer = dev_get_drvdata(&unit->device); 1537 int generation; 1538 1539 generation = device->generation; 1540 1541 spin_lock_irq(&peer->dev->lock); 1542 peer->node_id = device->node_id; 1543 peer->generation = generation; 1544 spin_unlock_irq(&peer->dev->lock); 1545 } 1546 1547 static void fwnet_remove_peer(struct fwnet_peer *peer, struct fwnet_device *dev) 1548 { 1549 struct fwnet_partial_datagram *pd, *pd_next; 1550 1551 spin_lock_irq(&dev->lock); 1552 list_del(&peer->peer_link); 1553 dev->peer_count--; 1554 set_carrier_state(dev); 1555 spin_unlock_irq(&dev->lock); 1556 1557 list_for_each_entry_safe(pd, pd_next, &peer->pd_list, pd_link) 1558 fwnet_pd_delete(pd); 1559 1560 kfree(peer); 1561 } 1562 1563 static void fwnet_remove(struct fw_unit *unit) 1564 { 1565 struct fwnet_peer *peer = dev_get_drvdata(&unit->device); 1566 struct fwnet_device *dev = peer->dev; 1567 struct net_device *net; 1568 int i; 1569 1570 mutex_lock(&fwnet_device_mutex); 1571 1572 net = dev->netdev; 1573 1574 fwnet_remove_peer(peer, dev); 1575 1576 if (list_empty(&dev->peer_list)) { 1577 unregister_netdev(net); 1578 1579 fwnet_fifo_stop(dev); 1580 1581 for (i = 0; dev->queued_datagrams && i < 5; i++) 1582 ssleep(1); 1583 WARN_ON(dev->queued_datagrams); 1584 list_del(&dev->dev_link); 1585 1586 free_netdev(net); 1587 } 1588 1589 mutex_unlock(&fwnet_device_mutex); 1590 } 1591 1592 static const struct ieee1394_device_id fwnet_id_table[] = { 1593 { 1594 .match_flags = IEEE1394_MATCH_SPECIFIER_ID | 1595 IEEE1394_MATCH_VERSION, 1596 .specifier_id = IANA_SPECIFIER_ID, 1597 .version = RFC2734_SW_VERSION, 1598 }, 1599 #if IS_ENABLED(CONFIG_IPV6) 1600 { 1601 .match_flags = IEEE1394_MATCH_SPECIFIER_ID | 1602 IEEE1394_MATCH_VERSION, 1603 .specifier_id = IANA_SPECIFIER_ID, 1604 .version = RFC3146_SW_VERSION, 1605 }, 1606 #endif 1607 { } 1608 }; 1609 1610 static struct fw_driver fwnet_driver = { 1611 .driver = { 1612 .owner = THIS_MODULE, 1613 .name = KBUILD_MODNAME, 1614 .bus = &fw_bus_type, 1615 }, 1616 .probe = fwnet_probe, 1617 .update = fwnet_update, 1618 .remove = fwnet_remove, 1619 .id_table = fwnet_id_table, 1620 }; 1621 1622 static const u32 rfc2374_unit_directory_data[] = { 1623 0x00040000, /* directory_length */ 1624 0x1200005e, /* unit_specifier_id: IANA */ 1625 0x81000003, /* textual descriptor offset */ 1626 0x13000001, /* unit_sw_version: RFC 2734 */ 1627 0x81000005, /* textual descriptor offset */ 1628 0x00030000, /* descriptor_length */ 1629 0x00000000, /* text */ 1630 0x00000000, /* minimal ASCII, en */ 1631 0x49414e41, /* I A N A */ 1632 0x00030000, /* descriptor_length */ 1633 0x00000000, /* text */ 1634 0x00000000, /* minimal ASCII, en */ 1635 0x49507634, /* I P v 4 */ 1636 }; 1637 1638 static struct fw_descriptor rfc2374_unit_directory = { 1639 .length = ARRAY_SIZE(rfc2374_unit_directory_data), 1640 .key = (CSR_DIRECTORY | CSR_UNIT) << 24, 1641 .data = rfc2374_unit_directory_data 1642 }; 1643 1644 #if IS_ENABLED(CONFIG_IPV6) 1645 static const u32 rfc3146_unit_directory_data[] = { 1646 0x00040000, /* directory_length */ 1647 0x1200005e, /* unit_specifier_id: IANA */ 1648 0x81000003, /* textual descriptor offset */ 1649 0x13000002, /* unit_sw_version: RFC 3146 */ 1650 0x81000005, /* textual descriptor offset */ 1651 0x00030000, /* descriptor_length */ 1652 0x00000000, /* text */ 1653 0x00000000, /* minimal ASCII, en */ 1654 0x49414e41, /* I A N A */ 1655 0x00030000, /* descriptor_length */ 1656 0x00000000, /* text */ 1657 0x00000000, /* minimal ASCII, en */ 1658 0x49507636, /* I P v 6 */ 1659 }; 1660 1661 static struct fw_descriptor rfc3146_unit_directory = { 1662 .length = ARRAY_SIZE(rfc3146_unit_directory_data), 1663 .key = (CSR_DIRECTORY | CSR_UNIT) << 24, 1664 .data = rfc3146_unit_directory_data 1665 }; 1666 #endif 1667 1668 static int __init fwnet_init(void) 1669 { 1670 int err; 1671 1672 err = fw_core_add_descriptor(&rfc2374_unit_directory); 1673 if (err) 1674 return err; 1675 1676 #if IS_ENABLED(CONFIG_IPV6) 1677 err = fw_core_add_descriptor(&rfc3146_unit_directory); 1678 if (err) 1679 goto out; 1680 #endif 1681 1682 fwnet_packet_task_cache = kmem_cache_create("packet_task", 1683 sizeof(struct fwnet_packet_task), 0, 0, NULL); 1684 if (!fwnet_packet_task_cache) { 1685 err = -ENOMEM; 1686 goto out2; 1687 } 1688 1689 err = driver_register(&fwnet_driver.driver); 1690 if (!err) 1691 return 0; 1692 1693 kmem_cache_destroy(fwnet_packet_task_cache); 1694 out2: 1695 #if IS_ENABLED(CONFIG_IPV6) 1696 fw_core_remove_descriptor(&rfc3146_unit_directory); 1697 out: 1698 #endif 1699 fw_core_remove_descriptor(&rfc2374_unit_directory); 1700 1701 return err; 1702 } 1703 module_init(fwnet_init); 1704 1705 static void __exit fwnet_cleanup(void) 1706 { 1707 driver_unregister(&fwnet_driver.driver); 1708 kmem_cache_destroy(fwnet_packet_task_cache); 1709 #if IS_ENABLED(CONFIG_IPV6) 1710 fw_core_remove_descriptor(&rfc3146_unit_directory); 1711 #endif 1712 fw_core_remove_descriptor(&rfc2374_unit_directory); 1713 } 1714 module_exit(fwnet_cleanup); 1715 1716 MODULE_AUTHOR("Jay Fenlason <fenlason@redhat.com>"); 1717 MODULE_DESCRIPTION("IP over IEEE1394 as per RFC 2734/3146"); 1718 MODULE_LICENSE("GPL"); 1719 MODULE_DEVICE_TABLE(ieee1394, fwnet_id_table); 1720