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