1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * IPv4 over IEEE 1394, per RFC 2734 4 * IPv6 over IEEE 1394, per RFC 3146 5 * 6 * Copyright (C) 2009 Jay Fenlason <fenlason@redhat.com> 7 * 8 * based on eth1394 by Ben Collins et al 9 */ 10 11 #include <linux/bug.h> 12 #include <linux/compiler.h> 13 #include <linux/delay.h> 14 #include <linux/device.h> 15 #include <linux/ethtool.h> 16 #include <linux/firewire.h> 17 #include <linux/firewire-constants.h> 18 #include <linux/highmem.h> 19 #include <linux/in.h> 20 #include <linux/ip.h> 21 #include <linux/jiffies.h> 22 #include <linux/mod_devicetable.h> 23 #include <linux/module.h> 24 #include <linux/moduleparam.h> 25 #include <linux/mutex.h> 26 #include <linux/netdevice.h> 27 #include <linux/skbuff.h> 28 #include <linux/slab.h> 29 #include <linux/spinlock.h> 30 31 #include <asm/unaligned.h> 32 #include <net/arp.h> 33 #include <net/firewire.h> 34 35 /* rx limits */ 36 #define FWNET_MAX_FRAGMENTS 30 /* arbitrary, > TX queue depth */ 37 #define FWNET_ISO_PAGE_COUNT (PAGE_SIZE < 16*1024 ? 4 : 2) 38 39 /* tx limits */ 40 #define FWNET_MAX_QUEUED_DATAGRAMS 20 /* < 64 = number of tlabels */ 41 #define FWNET_MIN_QUEUED_DATAGRAMS 10 /* should keep AT DMA busy enough */ 42 #define FWNET_TX_QUEUE_LEN FWNET_MAX_QUEUED_DATAGRAMS /* ? */ 43 44 #define IEEE1394_BROADCAST_CHANNEL 31 45 #define IEEE1394_ALL_NODES (0xffc0 | 0x003f) 46 #define IEEE1394_MAX_PAYLOAD_S100 512 47 #define FWNET_NO_FIFO_ADDR (~0ULL) 48 49 #define IANA_SPECIFIER_ID 0x00005eU 50 #define RFC2734_SW_VERSION 0x000001U 51 #define RFC3146_SW_VERSION 0x000002U 52 53 #define IEEE1394_GASP_HDR_SIZE 8 54 55 #define RFC2374_UNFRAG_HDR_SIZE 4 56 #define RFC2374_FRAG_HDR_SIZE 8 57 #define RFC2374_FRAG_OVERHEAD 4 58 59 #define RFC2374_HDR_UNFRAG 0 /* unfragmented */ 60 #define RFC2374_HDR_FIRSTFRAG 1 /* first fragment */ 61 #define RFC2374_HDR_LASTFRAG 2 /* last fragment */ 62 #define RFC2374_HDR_INTFRAG 3 /* interior fragment */ 63 64 static bool fwnet_hwaddr_is_multicast(u8 *ha) 65 { 66 return !!(*ha & 1); 67 } 68 69 /* IPv4 and IPv6 encapsulation header */ 70 struct rfc2734_header { 71 u32 w0; 72 u32 w1; 73 }; 74 75 #define fwnet_get_hdr_lf(h) (((h)->w0 & 0xc0000000) >> 30) 76 #define fwnet_get_hdr_ether_type(h) (((h)->w0 & 0x0000ffff)) 77 #define fwnet_get_hdr_dg_size(h) ((((h)->w0 & 0x0fff0000) >> 16) + 1) 78 #define fwnet_get_hdr_fg_off(h) (((h)->w0 & 0x00000fff)) 79 #define fwnet_get_hdr_dgl(h) (((h)->w1 & 0xffff0000) >> 16) 80 81 #define fwnet_set_hdr_lf(lf) ((lf) << 30) 82 #define fwnet_set_hdr_ether_type(et) (et) 83 #define fwnet_set_hdr_dg_size(dgs) (((dgs) - 1) << 16) 84 #define fwnet_set_hdr_fg_off(fgo) (fgo) 85 86 #define fwnet_set_hdr_dgl(dgl) ((dgl) << 16) 87 88 static inline void fwnet_make_uf_hdr(struct rfc2734_header *hdr, 89 unsigned ether_type) 90 { 91 hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_UNFRAG) 92 | fwnet_set_hdr_ether_type(ether_type); 93 } 94 95 static inline void fwnet_make_ff_hdr(struct rfc2734_header *hdr, 96 unsigned ether_type, unsigned dg_size, unsigned dgl) 97 { 98 hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_FIRSTFRAG) 99 | fwnet_set_hdr_dg_size(dg_size) 100 | fwnet_set_hdr_ether_type(ether_type); 101 hdr->w1 = fwnet_set_hdr_dgl(dgl); 102 } 103 104 static inline void fwnet_make_sf_hdr(struct rfc2734_header *hdr, 105 unsigned lf, unsigned dg_size, unsigned fg_off, unsigned dgl) 106 { 107 hdr->w0 = fwnet_set_hdr_lf(lf) 108 | fwnet_set_hdr_dg_size(dg_size) 109 | fwnet_set_hdr_fg_off(fg_off); 110 hdr->w1 = fwnet_set_hdr_dgl(dgl); 111 } 112 113 /* This list keeps track of what parts of the datagram have been filled in */ 114 struct fwnet_fragment_info { 115 struct list_head fi_link; 116 u16 offset; 117 u16 len; 118 }; 119 120 struct fwnet_partial_datagram { 121 struct list_head pd_link; 122 struct list_head fi_list; 123 struct sk_buff *skb; 124 /* FIXME Why not use skb->data? */ 125 char *pbuf; 126 u16 datagram_label; 127 u16 ether_type; 128 u16 datagram_size; 129 }; 130 131 static DEFINE_MUTEX(fwnet_device_mutex); 132 static LIST_HEAD(fwnet_device_list); 133 134 struct fwnet_device { 135 struct list_head dev_link; 136 spinlock_t lock; 137 enum { 138 FWNET_BROADCAST_ERROR, 139 FWNET_BROADCAST_RUNNING, 140 FWNET_BROADCAST_STOPPED, 141 } broadcast_state; 142 struct fw_iso_context *broadcast_rcv_context; 143 struct fw_iso_buffer broadcast_rcv_buffer; 144 void **broadcast_rcv_buffer_ptrs; 145 unsigned broadcast_rcv_next_ptr; 146 unsigned num_broadcast_rcv_ptrs; 147 unsigned rcv_buffer_size; 148 /* 149 * This value is the maximum unfragmented datagram size that can be 150 * sent by the hardware. It already has the GASP overhead and the 151 * unfragmented datagram header overhead calculated into it. 152 */ 153 unsigned broadcast_xmt_max_payload; 154 u16 broadcast_xmt_datagramlabel; 155 156 /* 157 * The CSR address that remote nodes must send datagrams to for us to 158 * receive them. 159 */ 160 struct fw_address_handler handler; 161 u64 local_fifo; 162 163 /* Number of tx datagrams that have been queued but not yet acked */ 164 int queued_datagrams; 165 166 int peer_count; 167 struct list_head peer_list; 168 struct fw_card *card; 169 struct net_device *netdev; 170 }; 171 172 struct fwnet_peer { 173 struct list_head peer_link; 174 struct fwnet_device *dev; 175 u64 guid; 176 177 /* guarded by dev->lock */ 178 struct list_head pd_list; /* received partial datagrams */ 179 unsigned pdg_size; /* pd_list size */ 180 181 u16 datagram_label; /* outgoing datagram label */ 182 u16 max_payload; /* includes RFC2374_FRAG_HDR_SIZE overhead */ 183 int node_id; 184 int generation; 185 unsigned speed; 186 }; 187 188 /* This is our task struct. It's used for the packet complete callback. */ 189 struct fwnet_packet_task { 190 struct fw_transaction transaction; 191 struct rfc2734_header hdr; 192 struct sk_buff *skb; 193 struct fwnet_device *dev; 194 195 int outstanding_pkts; 196 u64 fifo_addr; 197 u16 dest_node; 198 u16 max_payload; 199 u8 generation; 200 u8 speed; 201 u8 enqueued; 202 }; 203 204 /* 205 * Get fifo address embedded in hwaddr 206 */ 207 static __u64 fwnet_hwaddr_fifo(union fwnet_hwaddr *ha) 208 { 209 return (u64)get_unaligned_be16(&ha->uc.fifo_hi) << 32 210 | get_unaligned_be32(&ha->uc.fifo_lo); 211 } 212 213 /* 214 * saddr == NULL means use device source address. 215 * daddr == NULL means leave destination address (eg unresolved arp). 216 */ 217 static int fwnet_header_create(struct sk_buff *skb, struct net_device *net, 218 unsigned short type, const void *daddr, 219 const void *saddr, unsigned len) 220 { 221 struct fwnet_header *h; 222 223 h = skb_push(skb, sizeof(*h)); 224 put_unaligned_be16(type, &h->h_proto); 225 226 if (net->flags & (IFF_LOOPBACK | IFF_NOARP)) { 227 memset(h->h_dest, 0, net->addr_len); 228 229 return net->hard_header_len; 230 } 231 232 if (daddr) { 233 memcpy(h->h_dest, daddr, net->addr_len); 234 235 return net->hard_header_len; 236 } 237 238 return -net->hard_header_len; 239 } 240 241 static int fwnet_header_cache(const struct neighbour *neigh, 242 struct hh_cache *hh, __be16 type) 243 { 244 struct net_device *net; 245 struct fwnet_header *h; 246 247 if (type == cpu_to_be16(ETH_P_802_3)) 248 return -1; 249 net = neigh->dev; 250 h = (struct fwnet_header *)((u8 *)hh->hh_data + HH_DATA_OFF(sizeof(*h))); 251 h->h_proto = type; 252 memcpy(h->h_dest, neigh->ha, net->addr_len); 253 254 /* Pairs with the READ_ONCE() in neigh_resolve_output(), 255 * neigh_hh_output() and neigh_update_hhs(). 256 */ 257 smp_store_release(&hh->hh_len, FWNET_HLEN); 258 259 return 0; 260 } 261 262 /* Called by Address Resolution module to notify changes in address. */ 263 static void fwnet_header_cache_update(struct hh_cache *hh, 264 const struct net_device *net, const unsigned char *haddr) 265 { 266 memcpy((u8 *)hh->hh_data + HH_DATA_OFF(FWNET_HLEN), haddr, net->addr_len); 267 } 268 269 static int fwnet_header_parse(const struct sk_buff *skb, unsigned char *haddr) 270 { 271 memcpy(haddr, skb->dev->dev_addr, FWNET_ALEN); 272 273 return FWNET_ALEN; 274 } 275 276 static const struct header_ops fwnet_header_ops = { 277 .create = fwnet_header_create, 278 .cache = fwnet_header_cache, 279 .cache_update = fwnet_header_cache_update, 280 .parse = fwnet_header_parse, 281 }; 282 283 /* FIXME: is this correct for all cases? */ 284 static bool fwnet_frag_overlap(struct fwnet_partial_datagram *pd, 285 unsigned offset, unsigned len) 286 { 287 struct fwnet_fragment_info *fi; 288 unsigned end = offset + len; 289 290 list_for_each_entry(fi, &pd->fi_list, fi_link) 291 if (offset < fi->offset + fi->len && end > fi->offset) 292 return true; 293 294 return false; 295 } 296 297 /* Assumes that new fragment does not overlap any existing fragments */ 298 static struct fwnet_fragment_info *fwnet_frag_new( 299 struct fwnet_partial_datagram *pd, unsigned offset, unsigned len) 300 { 301 struct fwnet_fragment_info *fi, *fi2, *new; 302 struct list_head *list; 303 304 list = &pd->fi_list; 305 list_for_each_entry(fi, &pd->fi_list, fi_link) { 306 if (fi->offset + fi->len == offset) { 307 /* The new fragment can be tacked on to the end */ 308 /* Did the new fragment plug a hole? */ 309 fi2 = list_entry(fi->fi_link.next, 310 struct fwnet_fragment_info, fi_link); 311 if (fi->offset + fi->len == fi2->offset) { 312 /* glue fragments together */ 313 fi->len += len + fi2->len; 314 list_del(&fi2->fi_link); 315 kfree(fi2); 316 } else { 317 fi->len += len; 318 } 319 320 return fi; 321 } 322 if (offset + len == fi->offset) { 323 /* The new fragment can be tacked on to the beginning */ 324 /* Did the new fragment plug a hole? */ 325 fi2 = list_entry(fi->fi_link.prev, 326 struct fwnet_fragment_info, fi_link); 327 if (fi2->offset + fi2->len == fi->offset) { 328 /* glue fragments together */ 329 fi2->len += fi->len + len; 330 list_del(&fi->fi_link); 331 kfree(fi); 332 333 return fi2; 334 } 335 fi->offset = offset; 336 fi->len += len; 337 338 return fi; 339 } 340 if (offset > fi->offset + fi->len) { 341 list = &fi->fi_link; 342 break; 343 } 344 if (offset + len < fi->offset) { 345 list = fi->fi_link.prev; 346 break; 347 } 348 } 349 350 new = kmalloc(sizeof(*new), GFP_ATOMIC); 351 if (!new) 352 return NULL; 353 354 new->offset = offset; 355 new->len = len; 356 list_add(&new->fi_link, list); 357 358 return new; 359 } 360 361 static struct fwnet_partial_datagram *fwnet_pd_new(struct net_device *net, 362 struct fwnet_peer *peer, u16 datagram_label, unsigned dg_size, 363 void *frag_buf, unsigned frag_off, unsigned frag_len) 364 { 365 struct fwnet_partial_datagram *new; 366 struct fwnet_fragment_info *fi; 367 368 new = kmalloc(sizeof(*new), GFP_ATOMIC); 369 if (!new) 370 goto fail; 371 372 INIT_LIST_HEAD(&new->fi_list); 373 fi = fwnet_frag_new(new, frag_off, frag_len); 374 if (fi == NULL) 375 goto fail_w_new; 376 377 new->datagram_label = datagram_label; 378 new->datagram_size = dg_size; 379 new->skb = dev_alloc_skb(dg_size + LL_RESERVED_SPACE(net)); 380 if (new->skb == NULL) 381 goto fail_w_fi; 382 383 skb_reserve(new->skb, LL_RESERVED_SPACE(net)); 384 new->pbuf = skb_put(new->skb, dg_size); 385 memcpy(new->pbuf + frag_off, frag_buf, frag_len); 386 list_add_tail(&new->pd_link, &peer->pd_list); 387 388 return new; 389 390 fail_w_fi: 391 kfree(fi); 392 fail_w_new: 393 kfree(new); 394 fail: 395 return NULL; 396 } 397 398 static struct fwnet_partial_datagram *fwnet_pd_find(struct fwnet_peer *peer, 399 u16 datagram_label) 400 { 401 struct fwnet_partial_datagram *pd; 402 403 list_for_each_entry(pd, &peer->pd_list, pd_link) 404 if (pd->datagram_label == datagram_label) 405 return pd; 406 407 return NULL; 408 } 409 410 411 static void fwnet_pd_delete(struct fwnet_partial_datagram *old) 412 { 413 struct fwnet_fragment_info *fi, *n; 414 415 list_for_each_entry_safe(fi, n, &old->fi_list, fi_link) 416 kfree(fi); 417 418 list_del(&old->pd_link); 419 dev_kfree_skb_any(old->skb); 420 kfree(old); 421 } 422 423 static bool fwnet_pd_update(struct fwnet_peer *peer, 424 struct fwnet_partial_datagram *pd, void *frag_buf, 425 unsigned frag_off, unsigned frag_len) 426 { 427 if (fwnet_frag_new(pd, frag_off, frag_len) == NULL) 428 return false; 429 430 memcpy(pd->pbuf + frag_off, frag_buf, frag_len); 431 432 /* 433 * Move list entry to beginning of list so that oldest partial 434 * datagrams percolate to the end of the list 435 */ 436 list_move_tail(&pd->pd_link, &peer->pd_list); 437 438 return true; 439 } 440 441 static bool fwnet_pd_is_complete(struct fwnet_partial_datagram *pd) 442 { 443 struct fwnet_fragment_info *fi; 444 445 fi = list_entry(pd->fi_list.next, struct fwnet_fragment_info, fi_link); 446 447 return fi->len == pd->datagram_size; 448 } 449 450 /* caller must hold dev->lock */ 451 static struct fwnet_peer *fwnet_peer_find_by_guid(struct fwnet_device *dev, 452 u64 guid) 453 { 454 struct fwnet_peer *peer; 455 456 list_for_each_entry(peer, &dev->peer_list, peer_link) 457 if (peer->guid == guid) 458 return peer; 459 460 return NULL; 461 } 462 463 /* caller must hold dev->lock */ 464 static struct fwnet_peer *fwnet_peer_find_by_node_id(struct fwnet_device *dev, 465 int node_id, int generation) 466 { 467 struct fwnet_peer *peer; 468 469 list_for_each_entry(peer, &dev->peer_list, peer_link) 470 if (peer->node_id == node_id && 471 peer->generation == generation) 472 return peer; 473 474 return NULL; 475 } 476 477 /* See IEEE 1394-2008 table 6-4, table 8-8, table 16-18. */ 478 static unsigned fwnet_max_payload(unsigned max_rec, unsigned speed) 479 { 480 max_rec = min(max_rec, speed + 8); 481 max_rec = clamp(max_rec, 8U, 11U); /* 512...4096 */ 482 483 return (1 << (max_rec + 1)) - RFC2374_FRAG_HDR_SIZE; 484 } 485 486 487 static int fwnet_finish_incoming_packet(struct net_device *net, 488 struct sk_buff *skb, u16 source_node_id, 489 bool is_broadcast, u16 ether_type) 490 { 491 int status; 492 493 switch (ether_type) { 494 case ETH_P_ARP: 495 case ETH_P_IP: 496 #if IS_ENABLED(CONFIG_IPV6) 497 case ETH_P_IPV6: 498 #endif 499 break; 500 default: 501 goto err; 502 } 503 504 /* Write metadata, and then pass to the receive level */ 505 skb->dev = net; 506 skb->ip_summed = CHECKSUM_NONE; 507 508 /* 509 * Parse the encapsulation header. This actually does the job of 510 * converting to an ethernet-like pseudo frame header. 511 */ 512 if (dev_hard_header(skb, net, ether_type, 513 is_broadcast ? net->broadcast : net->dev_addr, 514 NULL, skb->len) >= 0) { 515 struct fwnet_header *eth; 516 u16 *rawp; 517 __be16 protocol; 518 519 skb_reset_mac_header(skb); 520 skb_pull(skb, sizeof(*eth)); 521 eth = (struct fwnet_header *)skb_mac_header(skb); 522 if (fwnet_hwaddr_is_multicast(eth->h_dest)) { 523 if (memcmp(eth->h_dest, net->broadcast, 524 net->addr_len) == 0) 525 skb->pkt_type = PACKET_BROADCAST; 526 #if 0 527 else 528 skb->pkt_type = PACKET_MULTICAST; 529 #endif 530 } else { 531 if (memcmp(eth->h_dest, net->dev_addr, net->addr_len)) 532 skb->pkt_type = PACKET_OTHERHOST; 533 } 534 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN) { 535 protocol = eth->h_proto; 536 } else { 537 rawp = (u16 *)skb->data; 538 if (*rawp == 0xffff) 539 protocol = htons(ETH_P_802_3); 540 else 541 protocol = htons(ETH_P_802_2); 542 } 543 skb->protocol = protocol; 544 } 545 status = netif_rx(skb); 546 if (status == NET_RX_DROP) { 547 net->stats.rx_errors++; 548 net->stats.rx_dropped++; 549 } else { 550 net->stats.rx_packets++; 551 net->stats.rx_bytes += skb->len; 552 } 553 554 return 0; 555 556 err: 557 net->stats.rx_errors++; 558 net->stats.rx_dropped++; 559 560 dev_kfree_skb_any(skb); 561 562 return -ENOENT; 563 } 564 565 static int fwnet_incoming_packet(struct fwnet_device *dev, __be32 *buf, int len, 566 int source_node_id, int generation, 567 bool is_broadcast) 568 { 569 struct sk_buff *skb; 570 struct net_device *net = dev->netdev; 571 struct rfc2734_header hdr; 572 unsigned lf; 573 unsigned long flags; 574 struct fwnet_peer *peer; 575 struct fwnet_partial_datagram *pd; 576 int fg_off; 577 int dg_size; 578 u16 datagram_label; 579 int retval; 580 u16 ether_type; 581 582 if (len <= RFC2374_UNFRAG_HDR_SIZE) 583 return 0; 584 585 hdr.w0 = be32_to_cpu(buf[0]); 586 lf = fwnet_get_hdr_lf(&hdr); 587 if (lf == RFC2374_HDR_UNFRAG) { 588 /* 589 * An unfragmented datagram has been received by the ieee1394 590 * bus. Build an skbuff around it so we can pass it to the 591 * high level network layer. 592 */ 593 ether_type = fwnet_get_hdr_ether_type(&hdr); 594 buf++; 595 len -= RFC2374_UNFRAG_HDR_SIZE; 596 597 skb = dev_alloc_skb(len + LL_RESERVED_SPACE(net)); 598 if (unlikely(!skb)) { 599 net->stats.rx_dropped++; 600 601 return -ENOMEM; 602 } 603 skb_reserve(skb, LL_RESERVED_SPACE(net)); 604 skb_put_data(skb, buf, len); 605 606 return fwnet_finish_incoming_packet(net, skb, source_node_id, 607 is_broadcast, ether_type); 608 } 609 610 /* A datagram fragment has been received, now the fun begins. */ 611 612 if (len <= RFC2374_FRAG_HDR_SIZE) 613 return 0; 614 615 hdr.w1 = ntohl(buf[1]); 616 buf += 2; 617 len -= RFC2374_FRAG_HDR_SIZE; 618 if (lf == RFC2374_HDR_FIRSTFRAG) { 619 ether_type = fwnet_get_hdr_ether_type(&hdr); 620 fg_off = 0; 621 } else { 622 ether_type = 0; 623 fg_off = fwnet_get_hdr_fg_off(&hdr); 624 } 625 datagram_label = fwnet_get_hdr_dgl(&hdr); 626 dg_size = fwnet_get_hdr_dg_size(&hdr); 627 628 if (fg_off + len > dg_size) 629 return 0; 630 631 spin_lock_irqsave(&dev->lock, flags); 632 633 peer = fwnet_peer_find_by_node_id(dev, source_node_id, generation); 634 if (!peer) { 635 retval = -ENOENT; 636 goto fail; 637 } 638 639 pd = fwnet_pd_find(peer, datagram_label); 640 if (pd == NULL) { 641 while (peer->pdg_size >= FWNET_MAX_FRAGMENTS) { 642 /* remove the oldest */ 643 fwnet_pd_delete(list_first_entry(&peer->pd_list, 644 struct fwnet_partial_datagram, pd_link)); 645 peer->pdg_size--; 646 } 647 pd = fwnet_pd_new(net, peer, datagram_label, 648 dg_size, buf, fg_off, len); 649 if (pd == NULL) { 650 retval = -ENOMEM; 651 goto fail; 652 } 653 peer->pdg_size++; 654 } else { 655 if (fwnet_frag_overlap(pd, fg_off, len) || 656 pd->datagram_size != dg_size) { 657 /* 658 * Differing datagram sizes or overlapping fragments, 659 * discard old datagram and start a new one. 660 */ 661 fwnet_pd_delete(pd); 662 pd = fwnet_pd_new(net, peer, datagram_label, 663 dg_size, buf, fg_off, len); 664 if (pd == NULL) { 665 peer->pdg_size--; 666 retval = -ENOMEM; 667 goto fail; 668 } 669 } else { 670 if (!fwnet_pd_update(peer, pd, buf, fg_off, len)) { 671 /* 672 * Couldn't save off fragment anyway 673 * so might as well obliterate the 674 * datagram now. 675 */ 676 fwnet_pd_delete(pd); 677 peer->pdg_size--; 678 retval = -ENOMEM; 679 goto fail; 680 } 681 } 682 } /* new datagram or add to existing one */ 683 684 if (lf == RFC2374_HDR_FIRSTFRAG) 685 pd->ether_type = ether_type; 686 687 if (fwnet_pd_is_complete(pd)) { 688 ether_type = pd->ether_type; 689 peer->pdg_size--; 690 skb = skb_get(pd->skb); 691 fwnet_pd_delete(pd); 692 693 spin_unlock_irqrestore(&dev->lock, flags); 694 695 return fwnet_finish_incoming_packet(net, skb, source_node_id, 696 false, ether_type); 697 } 698 /* 699 * Datagram is not complete, we're done for the 700 * moment. 701 */ 702 retval = 0; 703 fail: 704 spin_unlock_irqrestore(&dev->lock, flags); 705 706 return retval; 707 } 708 709 static void fwnet_receive_packet(struct fw_card *card, struct fw_request *r, 710 int tcode, int destination, int source, int generation, 711 unsigned long long offset, void *payload, size_t length, 712 void *callback_data) 713 { 714 struct fwnet_device *dev = callback_data; 715 int rcode; 716 717 if (destination == IEEE1394_ALL_NODES) { 718 kfree(r); 719 720 return; 721 } 722 723 if (offset != dev->handler.offset) 724 rcode = RCODE_ADDRESS_ERROR; 725 else if (tcode != TCODE_WRITE_BLOCK_REQUEST) 726 rcode = RCODE_TYPE_ERROR; 727 else if (fwnet_incoming_packet(dev, payload, length, 728 source, generation, false) != 0) { 729 dev_err(&dev->netdev->dev, "incoming packet failure\n"); 730 rcode = RCODE_CONFLICT_ERROR; 731 } else 732 rcode = RCODE_COMPLETE; 733 734 fw_send_response(card, r, rcode); 735 } 736 737 static int gasp_source_id(__be32 *p) 738 { 739 return be32_to_cpu(p[0]) >> 16; 740 } 741 742 static u32 gasp_specifier_id(__be32 *p) 743 { 744 return (be32_to_cpu(p[0]) & 0xffff) << 8 | 745 (be32_to_cpu(p[1]) & 0xff000000) >> 24; 746 } 747 748 static u32 gasp_version(__be32 *p) 749 { 750 return be32_to_cpu(p[1]) & 0xffffff; 751 } 752 753 static void fwnet_receive_broadcast(struct fw_iso_context *context, 754 u32 cycle, size_t header_length, void *header, void *data) 755 { 756 struct fwnet_device *dev; 757 struct fw_iso_packet packet; 758 __be16 *hdr_ptr; 759 __be32 *buf_ptr; 760 int retval; 761 u32 length; 762 unsigned long offset; 763 unsigned long flags; 764 765 dev = data; 766 hdr_ptr = header; 767 length = be16_to_cpup(hdr_ptr); 768 769 spin_lock_irqsave(&dev->lock, flags); 770 771 offset = dev->rcv_buffer_size * dev->broadcast_rcv_next_ptr; 772 buf_ptr = dev->broadcast_rcv_buffer_ptrs[dev->broadcast_rcv_next_ptr++]; 773 if (dev->broadcast_rcv_next_ptr == dev->num_broadcast_rcv_ptrs) 774 dev->broadcast_rcv_next_ptr = 0; 775 776 spin_unlock_irqrestore(&dev->lock, flags); 777 778 if (length > IEEE1394_GASP_HDR_SIZE && 779 gasp_specifier_id(buf_ptr) == IANA_SPECIFIER_ID && 780 (gasp_version(buf_ptr) == RFC2734_SW_VERSION 781 #if IS_ENABLED(CONFIG_IPV6) 782 || gasp_version(buf_ptr) == RFC3146_SW_VERSION 783 #endif 784 )) 785 fwnet_incoming_packet(dev, buf_ptr + 2, 786 length - IEEE1394_GASP_HDR_SIZE, 787 gasp_source_id(buf_ptr), 788 context->card->generation, true); 789 790 packet.payload_length = dev->rcv_buffer_size; 791 packet.interrupt = 1; 792 packet.skip = 0; 793 packet.tag = 3; 794 packet.sy = 0; 795 packet.header_length = IEEE1394_GASP_HDR_SIZE; 796 797 spin_lock_irqsave(&dev->lock, flags); 798 799 retval = fw_iso_context_queue(dev->broadcast_rcv_context, &packet, 800 &dev->broadcast_rcv_buffer, offset); 801 802 spin_unlock_irqrestore(&dev->lock, flags); 803 804 if (retval >= 0) 805 fw_iso_context_queue_flush(dev->broadcast_rcv_context); 806 else 807 dev_err(&dev->netdev->dev, "requeue failed\n"); 808 } 809 810 static struct kmem_cache *fwnet_packet_task_cache; 811 812 static void fwnet_free_ptask(struct fwnet_packet_task *ptask) 813 { 814 dev_kfree_skb_any(ptask->skb); 815 kmem_cache_free(fwnet_packet_task_cache, ptask); 816 } 817 818 /* Caller must hold dev->lock. */ 819 static void dec_queued_datagrams(struct fwnet_device *dev) 820 { 821 if (--dev->queued_datagrams == FWNET_MIN_QUEUED_DATAGRAMS) 822 netif_wake_queue(dev->netdev); 823 } 824 825 static int fwnet_send_packet(struct fwnet_packet_task *ptask); 826 827 static void fwnet_transmit_packet_done(struct fwnet_packet_task *ptask) 828 { 829 struct fwnet_device *dev = ptask->dev; 830 struct sk_buff *skb = ptask->skb; 831 unsigned long flags; 832 bool free; 833 834 spin_lock_irqsave(&dev->lock, flags); 835 836 ptask->outstanding_pkts--; 837 838 /* Check whether we or the networking TX soft-IRQ is last user. */ 839 free = (ptask->outstanding_pkts == 0 && ptask->enqueued); 840 if (free) 841 dec_queued_datagrams(dev); 842 843 if (ptask->outstanding_pkts == 0) { 844 dev->netdev->stats.tx_packets++; 845 dev->netdev->stats.tx_bytes += skb->len; 846 } 847 848 spin_unlock_irqrestore(&dev->lock, flags); 849 850 if (ptask->outstanding_pkts > 0) { 851 u16 dg_size; 852 u16 fg_off; 853 u16 datagram_label; 854 u16 lf; 855 856 /* Update the ptask to point to the next fragment and send it */ 857 lf = fwnet_get_hdr_lf(&ptask->hdr); 858 switch (lf) { 859 case RFC2374_HDR_LASTFRAG: 860 case RFC2374_HDR_UNFRAG: 861 default: 862 dev_err(&dev->netdev->dev, 863 "outstanding packet %x lf %x, header %x,%x\n", 864 ptask->outstanding_pkts, lf, ptask->hdr.w0, 865 ptask->hdr.w1); 866 BUG(); 867 868 case RFC2374_HDR_FIRSTFRAG: 869 /* Set frag type here for future interior fragments */ 870 dg_size = fwnet_get_hdr_dg_size(&ptask->hdr); 871 fg_off = ptask->max_payload - RFC2374_FRAG_HDR_SIZE; 872 datagram_label = fwnet_get_hdr_dgl(&ptask->hdr); 873 break; 874 875 case RFC2374_HDR_INTFRAG: 876 dg_size = fwnet_get_hdr_dg_size(&ptask->hdr); 877 fg_off = fwnet_get_hdr_fg_off(&ptask->hdr) 878 + ptask->max_payload - RFC2374_FRAG_HDR_SIZE; 879 datagram_label = fwnet_get_hdr_dgl(&ptask->hdr); 880 break; 881 } 882 883 if (ptask->dest_node == IEEE1394_ALL_NODES) { 884 skb_pull(skb, 885 ptask->max_payload + IEEE1394_GASP_HDR_SIZE); 886 } else { 887 skb_pull(skb, ptask->max_payload); 888 } 889 if (ptask->outstanding_pkts > 1) { 890 fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_INTFRAG, 891 dg_size, fg_off, datagram_label); 892 } else { 893 fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_LASTFRAG, 894 dg_size, fg_off, datagram_label); 895 ptask->max_payload = skb->len + RFC2374_FRAG_HDR_SIZE; 896 } 897 fwnet_send_packet(ptask); 898 } 899 900 if (free) 901 fwnet_free_ptask(ptask); 902 } 903 904 static void fwnet_transmit_packet_failed(struct fwnet_packet_task *ptask) 905 { 906 struct fwnet_device *dev = ptask->dev; 907 unsigned long flags; 908 bool free; 909 910 spin_lock_irqsave(&dev->lock, flags); 911 912 /* One fragment failed; don't try to send remaining fragments. */ 913 ptask->outstanding_pkts = 0; 914 915 /* Check whether we or the networking TX soft-IRQ is last user. */ 916 free = ptask->enqueued; 917 if (free) 918 dec_queued_datagrams(dev); 919 920 dev->netdev->stats.tx_dropped++; 921 dev->netdev->stats.tx_errors++; 922 923 spin_unlock_irqrestore(&dev->lock, flags); 924 925 if (free) 926 fwnet_free_ptask(ptask); 927 } 928 929 static void fwnet_write_complete(struct fw_card *card, int rcode, 930 void *payload, size_t length, void *data) 931 { 932 struct fwnet_packet_task *ptask = data; 933 static unsigned long j; 934 static int last_rcode, errors_skipped; 935 936 if (rcode == RCODE_COMPLETE) { 937 fwnet_transmit_packet_done(ptask); 938 } else { 939 if (printk_timed_ratelimit(&j, 1000) || rcode != last_rcode) { 940 dev_err(&ptask->dev->netdev->dev, 941 "fwnet_write_complete failed: %x (skipped %d)\n", 942 rcode, errors_skipped); 943 944 errors_skipped = 0; 945 last_rcode = rcode; 946 } else { 947 errors_skipped++; 948 } 949 fwnet_transmit_packet_failed(ptask); 950 } 951 } 952 953 static int fwnet_send_packet(struct fwnet_packet_task *ptask) 954 { 955 struct fwnet_device *dev; 956 unsigned tx_len; 957 struct rfc2734_header *bufhdr; 958 unsigned long flags; 959 bool free; 960 961 dev = ptask->dev; 962 tx_len = ptask->max_payload; 963 switch (fwnet_get_hdr_lf(&ptask->hdr)) { 964 case RFC2374_HDR_UNFRAG: 965 bufhdr = skb_push(ptask->skb, RFC2374_UNFRAG_HDR_SIZE); 966 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0); 967 break; 968 969 case RFC2374_HDR_FIRSTFRAG: 970 case RFC2374_HDR_INTFRAG: 971 case RFC2374_HDR_LASTFRAG: 972 bufhdr = skb_push(ptask->skb, RFC2374_FRAG_HDR_SIZE); 973 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0); 974 put_unaligned_be32(ptask->hdr.w1, &bufhdr->w1); 975 break; 976 977 default: 978 BUG(); 979 } 980 if (ptask->dest_node == IEEE1394_ALL_NODES) { 981 u8 *p; 982 int generation; 983 int node_id; 984 unsigned int sw_version; 985 986 /* ptask->generation may not have been set yet */ 987 generation = dev->card->generation; 988 smp_rmb(); 989 node_id = dev->card->node_id; 990 991 switch (ptask->skb->protocol) { 992 default: 993 sw_version = RFC2734_SW_VERSION; 994 break; 995 #if IS_ENABLED(CONFIG_IPV6) 996 case htons(ETH_P_IPV6): 997 sw_version = RFC3146_SW_VERSION; 998 #endif 999 } 1000 1001 p = skb_push(ptask->skb, IEEE1394_GASP_HDR_SIZE); 1002 put_unaligned_be32(node_id << 16 | IANA_SPECIFIER_ID >> 8, p); 1003 put_unaligned_be32((IANA_SPECIFIER_ID & 0xff) << 24 1004 | sw_version, &p[4]); 1005 1006 /* We should not transmit if broadcast_channel.valid == 0. */ 1007 fw_send_request(dev->card, &ptask->transaction, 1008 TCODE_STREAM_DATA, 1009 fw_stream_packet_destination_id(3, 1010 IEEE1394_BROADCAST_CHANNEL, 0), 1011 generation, SCODE_100, 0ULL, ptask->skb->data, 1012 tx_len + 8, fwnet_write_complete, ptask); 1013 1014 spin_lock_irqsave(&dev->lock, flags); 1015 1016 /* If the AT tasklet already ran, we may be last user. */ 1017 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued); 1018 if (!free) 1019 ptask->enqueued = true; 1020 else 1021 dec_queued_datagrams(dev); 1022 1023 spin_unlock_irqrestore(&dev->lock, flags); 1024 1025 goto out; 1026 } 1027 1028 fw_send_request(dev->card, &ptask->transaction, 1029 TCODE_WRITE_BLOCK_REQUEST, ptask->dest_node, 1030 ptask->generation, ptask->speed, ptask->fifo_addr, 1031 ptask->skb->data, tx_len, fwnet_write_complete, ptask); 1032 1033 spin_lock_irqsave(&dev->lock, flags); 1034 1035 /* If the AT tasklet already ran, we may be last user. */ 1036 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued); 1037 if (!free) 1038 ptask->enqueued = true; 1039 else 1040 dec_queued_datagrams(dev); 1041 1042 spin_unlock_irqrestore(&dev->lock, flags); 1043 1044 netif_trans_update(dev->netdev); 1045 out: 1046 if (free) 1047 fwnet_free_ptask(ptask); 1048 1049 return 0; 1050 } 1051 1052 static void fwnet_fifo_stop(struct fwnet_device *dev) 1053 { 1054 if (dev->local_fifo == FWNET_NO_FIFO_ADDR) 1055 return; 1056 1057 fw_core_remove_address_handler(&dev->handler); 1058 dev->local_fifo = FWNET_NO_FIFO_ADDR; 1059 } 1060 1061 static int fwnet_fifo_start(struct fwnet_device *dev) 1062 { 1063 int retval; 1064 1065 if (dev->local_fifo != FWNET_NO_FIFO_ADDR) 1066 return 0; 1067 1068 dev->handler.length = 4096; 1069 dev->handler.address_callback = fwnet_receive_packet; 1070 dev->handler.callback_data = dev; 1071 1072 retval = fw_core_add_address_handler(&dev->handler, 1073 &fw_high_memory_region); 1074 if (retval < 0) 1075 return retval; 1076 1077 dev->local_fifo = dev->handler.offset; 1078 1079 return 0; 1080 } 1081 1082 static void __fwnet_broadcast_stop(struct fwnet_device *dev) 1083 { 1084 unsigned u; 1085 1086 if (dev->broadcast_state != FWNET_BROADCAST_ERROR) { 1087 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++) 1088 kunmap(dev->broadcast_rcv_buffer.pages[u]); 1089 fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer, dev->card); 1090 } 1091 if (dev->broadcast_rcv_context) { 1092 fw_iso_context_destroy(dev->broadcast_rcv_context); 1093 dev->broadcast_rcv_context = NULL; 1094 } 1095 kfree(dev->broadcast_rcv_buffer_ptrs); 1096 dev->broadcast_rcv_buffer_ptrs = NULL; 1097 dev->broadcast_state = FWNET_BROADCAST_ERROR; 1098 } 1099 1100 static void fwnet_broadcast_stop(struct fwnet_device *dev) 1101 { 1102 if (dev->broadcast_state == FWNET_BROADCAST_ERROR) 1103 return; 1104 fw_iso_context_stop(dev->broadcast_rcv_context); 1105 __fwnet_broadcast_stop(dev); 1106 } 1107 1108 static int fwnet_broadcast_start(struct fwnet_device *dev) 1109 { 1110 struct fw_iso_context *context; 1111 int retval; 1112 unsigned num_packets; 1113 unsigned max_receive; 1114 struct fw_iso_packet packet; 1115 unsigned long offset; 1116 void **ptrptr; 1117 unsigned u; 1118 1119 if (dev->broadcast_state != FWNET_BROADCAST_ERROR) 1120 return 0; 1121 1122 max_receive = 1U << (dev->card->max_receive + 1); 1123 num_packets = (FWNET_ISO_PAGE_COUNT * PAGE_SIZE) / max_receive; 1124 1125 ptrptr = kmalloc_array(num_packets, sizeof(void *), GFP_KERNEL); 1126 if (!ptrptr) { 1127 retval = -ENOMEM; 1128 goto failed; 1129 } 1130 dev->broadcast_rcv_buffer_ptrs = ptrptr; 1131 1132 context = fw_iso_context_create(dev->card, FW_ISO_CONTEXT_RECEIVE, 1133 IEEE1394_BROADCAST_CHANNEL, 1134 dev->card->link_speed, 8, 1135 fwnet_receive_broadcast, dev); 1136 if (IS_ERR(context)) { 1137 retval = PTR_ERR(context); 1138 goto failed; 1139 } 1140 1141 retval = fw_iso_buffer_init(&dev->broadcast_rcv_buffer, dev->card, 1142 FWNET_ISO_PAGE_COUNT, DMA_FROM_DEVICE); 1143 if (retval < 0) 1144 goto failed; 1145 1146 dev->broadcast_state = FWNET_BROADCAST_STOPPED; 1147 1148 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++) { 1149 void *ptr; 1150 unsigned v; 1151 1152 ptr = kmap(dev->broadcast_rcv_buffer.pages[u]); 1153 for (v = 0; v < num_packets / FWNET_ISO_PAGE_COUNT; v++) 1154 *ptrptr++ = (void *) ((char *)ptr + v * max_receive); 1155 } 1156 dev->broadcast_rcv_context = context; 1157 1158 packet.payload_length = max_receive; 1159 packet.interrupt = 1; 1160 packet.skip = 0; 1161 packet.tag = 3; 1162 packet.sy = 0; 1163 packet.header_length = IEEE1394_GASP_HDR_SIZE; 1164 offset = 0; 1165 1166 for (u = 0; u < num_packets; u++) { 1167 retval = fw_iso_context_queue(context, &packet, 1168 &dev->broadcast_rcv_buffer, offset); 1169 if (retval < 0) 1170 goto failed; 1171 1172 offset += max_receive; 1173 } 1174 dev->num_broadcast_rcv_ptrs = num_packets; 1175 dev->rcv_buffer_size = max_receive; 1176 dev->broadcast_rcv_next_ptr = 0U; 1177 retval = fw_iso_context_start(context, -1, 0, 1178 FW_ISO_CONTEXT_MATCH_ALL_TAGS); /* ??? sync */ 1179 if (retval < 0) 1180 goto failed; 1181 1182 /* FIXME: adjust it according to the min. speed of all known peers? */ 1183 dev->broadcast_xmt_max_payload = IEEE1394_MAX_PAYLOAD_S100 1184 - IEEE1394_GASP_HDR_SIZE - RFC2374_UNFRAG_HDR_SIZE; 1185 dev->broadcast_state = FWNET_BROADCAST_RUNNING; 1186 1187 return 0; 1188 1189 failed: 1190 __fwnet_broadcast_stop(dev); 1191 return retval; 1192 } 1193 1194 static void set_carrier_state(struct fwnet_device *dev) 1195 { 1196 if (dev->peer_count > 1) 1197 netif_carrier_on(dev->netdev); 1198 else 1199 netif_carrier_off(dev->netdev); 1200 } 1201 1202 /* ifup */ 1203 static int fwnet_open(struct net_device *net) 1204 { 1205 struct fwnet_device *dev = netdev_priv(net); 1206 int ret; 1207 1208 ret = fwnet_broadcast_start(dev); 1209 if (ret) 1210 return ret; 1211 1212 netif_start_queue(net); 1213 1214 spin_lock_irq(&dev->lock); 1215 set_carrier_state(dev); 1216 spin_unlock_irq(&dev->lock); 1217 1218 return 0; 1219 } 1220 1221 /* ifdown */ 1222 static int fwnet_stop(struct net_device *net) 1223 { 1224 struct fwnet_device *dev = netdev_priv(net); 1225 1226 netif_stop_queue(net); 1227 fwnet_broadcast_stop(dev); 1228 1229 return 0; 1230 } 1231 1232 static netdev_tx_t fwnet_tx(struct sk_buff *skb, struct net_device *net) 1233 { 1234 struct fwnet_header hdr_buf; 1235 struct fwnet_device *dev = netdev_priv(net); 1236 __be16 proto; 1237 u16 dest_node; 1238 unsigned max_payload; 1239 u16 dg_size; 1240 u16 *datagram_label_ptr; 1241 struct fwnet_packet_task *ptask; 1242 struct fwnet_peer *peer; 1243 unsigned long flags; 1244 1245 spin_lock_irqsave(&dev->lock, flags); 1246 1247 /* Can this happen? */ 1248 if (netif_queue_stopped(dev->netdev)) { 1249 spin_unlock_irqrestore(&dev->lock, flags); 1250 1251 return NETDEV_TX_BUSY; 1252 } 1253 1254 ptask = kmem_cache_alloc(fwnet_packet_task_cache, GFP_ATOMIC); 1255 if (ptask == NULL) 1256 goto fail; 1257 1258 skb = skb_share_check(skb, GFP_ATOMIC); 1259 if (!skb) 1260 goto fail; 1261 1262 /* 1263 * Make a copy of the driver-specific header. 1264 * We might need to rebuild the header on tx failure. 1265 */ 1266 memcpy(&hdr_buf, skb->data, sizeof(hdr_buf)); 1267 proto = hdr_buf.h_proto; 1268 1269 switch (proto) { 1270 case htons(ETH_P_ARP): 1271 case htons(ETH_P_IP): 1272 #if IS_ENABLED(CONFIG_IPV6) 1273 case htons(ETH_P_IPV6): 1274 #endif 1275 break; 1276 default: 1277 goto fail; 1278 } 1279 1280 skb_pull(skb, sizeof(hdr_buf)); 1281 dg_size = skb->len; 1282 1283 /* 1284 * Set the transmission type for the packet. ARP packets and IP 1285 * broadcast packets are sent via GASP. 1286 */ 1287 if (fwnet_hwaddr_is_multicast(hdr_buf.h_dest)) { 1288 max_payload = dev->broadcast_xmt_max_payload; 1289 datagram_label_ptr = &dev->broadcast_xmt_datagramlabel; 1290 1291 ptask->fifo_addr = FWNET_NO_FIFO_ADDR; 1292 ptask->generation = 0; 1293 ptask->dest_node = IEEE1394_ALL_NODES; 1294 ptask->speed = SCODE_100; 1295 } else { 1296 union fwnet_hwaddr *ha = (union fwnet_hwaddr *)hdr_buf.h_dest; 1297 __be64 guid = get_unaligned(&ha->uc.uniq_id); 1298 u8 generation; 1299 1300 peer = fwnet_peer_find_by_guid(dev, be64_to_cpu(guid)); 1301 if (!peer) 1302 goto fail; 1303 1304 generation = peer->generation; 1305 dest_node = peer->node_id; 1306 max_payload = peer->max_payload; 1307 datagram_label_ptr = &peer->datagram_label; 1308 1309 ptask->fifo_addr = fwnet_hwaddr_fifo(ha); 1310 ptask->generation = generation; 1311 ptask->dest_node = dest_node; 1312 ptask->speed = peer->speed; 1313 } 1314 1315 ptask->hdr.w0 = 0; 1316 ptask->hdr.w1 = 0; 1317 ptask->skb = skb; 1318 ptask->dev = dev; 1319 1320 /* Does it all fit in one packet? */ 1321 if (dg_size <= max_payload) { 1322 fwnet_make_uf_hdr(&ptask->hdr, ntohs(proto)); 1323 ptask->outstanding_pkts = 1; 1324 max_payload = dg_size + RFC2374_UNFRAG_HDR_SIZE; 1325 } else { 1326 u16 datagram_label; 1327 1328 max_payload -= RFC2374_FRAG_OVERHEAD; 1329 datagram_label = (*datagram_label_ptr)++; 1330 fwnet_make_ff_hdr(&ptask->hdr, ntohs(proto), dg_size, 1331 datagram_label); 1332 ptask->outstanding_pkts = DIV_ROUND_UP(dg_size, max_payload); 1333 max_payload += RFC2374_FRAG_HDR_SIZE; 1334 } 1335 1336 if (++dev->queued_datagrams == FWNET_MAX_QUEUED_DATAGRAMS) 1337 netif_stop_queue(dev->netdev); 1338 1339 spin_unlock_irqrestore(&dev->lock, flags); 1340 1341 ptask->max_payload = max_payload; 1342 ptask->enqueued = 0; 1343 1344 fwnet_send_packet(ptask); 1345 1346 return NETDEV_TX_OK; 1347 1348 fail: 1349 spin_unlock_irqrestore(&dev->lock, flags); 1350 1351 if (ptask) 1352 kmem_cache_free(fwnet_packet_task_cache, ptask); 1353 1354 if (skb != NULL) 1355 dev_kfree_skb(skb); 1356 1357 net->stats.tx_dropped++; 1358 net->stats.tx_errors++; 1359 1360 /* 1361 * FIXME: According to a patch from 2003-02-26, "returning non-zero 1362 * causes serious problems" here, allegedly. Before that patch, 1363 * -ERRNO was returned which is not appropriate under Linux 2.6. 1364 * Perhaps more needs to be done? Stop the queue in serious 1365 * conditions and restart it elsewhere? 1366 */ 1367 return NETDEV_TX_OK; 1368 } 1369 1370 static const struct ethtool_ops fwnet_ethtool_ops = { 1371 .get_link = ethtool_op_get_link, 1372 }; 1373 1374 static const struct net_device_ops fwnet_netdev_ops = { 1375 .ndo_open = fwnet_open, 1376 .ndo_stop = fwnet_stop, 1377 .ndo_start_xmit = fwnet_tx, 1378 }; 1379 1380 static void fwnet_init_dev(struct net_device *net) 1381 { 1382 net->header_ops = &fwnet_header_ops; 1383 net->netdev_ops = &fwnet_netdev_ops; 1384 net->watchdog_timeo = 2 * HZ; 1385 net->flags = IFF_BROADCAST | IFF_MULTICAST; 1386 net->features = NETIF_F_HIGHDMA; 1387 net->addr_len = FWNET_ALEN; 1388 net->hard_header_len = FWNET_HLEN; 1389 net->type = ARPHRD_IEEE1394; 1390 net->tx_queue_len = FWNET_TX_QUEUE_LEN; 1391 net->ethtool_ops = &fwnet_ethtool_ops; 1392 } 1393 1394 /* caller must hold fwnet_device_mutex */ 1395 static struct fwnet_device *fwnet_dev_find(struct fw_card *card) 1396 { 1397 struct fwnet_device *dev; 1398 1399 list_for_each_entry(dev, &fwnet_device_list, dev_link) 1400 if (dev->card == card) 1401 return dev; 1402 1403 return NULL; 1404 } 1405 1406 static int fwnet_add_peer(struct fwnet_device *dev, 1407 struct fw_unit *unit, struct fw_device *device) 1408 { 1409 struct fwnet_peer *peer; 1410 1411 peer = kmalloc(sizeof(*peer), GFP_KERNEL); 1412 if (!peer) 1413 return -ENOMEM; 1414 1415 dev_set_drvdata(&unit->device, peer); 1416 1417 peer->dev = dev; 1418 peer->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4]; 1419 INIT_LIST_HEAD(&peer->pd_list); 1420 peer->pdg_size = 0; 1421 peer->datagram_label = 0; 1422 peer->speed = device->max_speed; 1423 peer->max_payload = fwnet_max_payload(device->max_rec, peer->speed); 1424 1425 peer->generation = device->generation; 1426 smp_rmb(); 1427 peer->node_id = device->node_id; 1428 1429 spin_lock_irq(&dev->lock); 1430 list_add_tail(&peer->peer_link, &dev->peer_list); 1431 dev->peer_count++; 1432 set_carrier_state(dev); 1433 spin_unlock_irq(&dev->lock); 1434 1435 return 0; 1436 } 1437 1438 static int fwnet_probe(struct fw_unit *unit, 1439 const struct ieee1394_device_id *id) 1440 { 1441 struct fw_device *device = fw_parent_device(unit); 1442 struct fw_card *card = device->card; 1443 struct net_device *net; 1444 bool allocated_netdev = false; 1445 struct fwnet_device *dev; 1446 union fwnet_hwaddr ha; 1447 int ret; 1448 1449 mutex_lock(&fwnet_device_mutex); 1450 1451 dev = fwnet_dev_find(card); 1452 if (dev) { 1453 net = dev->netdev; 1454 goto have_dev; 1455 } 1456 1457 net = alloc_netdev(sizeof(*dev), "firewire%d", NET_NAME_UNKNOWN, 1458 fwnet_init_dev); 1459 if (net == NULL) { 1460 mutex_unlock(&fwnet_device_mutex); 1461 return -ENOMEM; 1462 } 1463 1464 allocated_netdev = true; 1465 SET_NETDEV_DEV(net, card->device); 1466 dev = netdev_priv(net); 1467 1468 spin_lock_init(&dev->lock); 1469 dev->broadcast_state = FWNET_BROADCAST_ERROR; 1470 dev->broadcast_rcv_context = NULL; 1471 dev->broadcast_xmt_max_payload = 0; 1472 dev->broadcast_xmt_datagramlabel = 0; 1473 dev->local_fifo = FWNET_NO_FIFO_ADDR; 1474 dev->queued_datagrams = 0; 1475 INIT_LIST_HEAD(&dev->peer_list); 1476 dev->card = card; 1477 dev->netdev = net; 1478 1479 ret = fwnet_fifo_start(dev); 1480 if (ret < 0) 1481 goto out; 1482 dev->local_fifo = dev->handler.offset; 1483 1484 /* 1485 * default MTU: RFC 2734 cl. 4, RFC 3146 cl. 4 1486 * maximum MTU: RFC 2734 cl. 4.2, fragment encapsulation header's 1487 * maximum possible datagram_size + 1 = 0xfff + 1 1488 */ 1489 net->mtu = 1500U; 1490 net->min_mtu = ETH_MIN_MTU; 1491 net->max_mtu = 4096U; 1492 1493 /* Set our hardware address while we're at it */ 1494 ha.uc.uniq_id = cpu_to_be64(card->guid); 1495 ha.uc.max_rec = dev->card->max_receive; 1496 ha.uc.sspd = dev->card->link_speed; 1497 ha.uc.fifo_hi = cpu_to_be16(dev->local_fifo >> 32); 1498 ha.uc.fifo_lo = cpu_to_be32(dev->local_fifo & 0xffffffff); 1499 dev_addr_set(net, ha.u); 1500 1501 memset(net->broadcast, -1, net->addr_len); 1502 1503 ret = register_netdev(net); 1504 if (ret) 1505 goto out; 1506 1507 list_add_tail(&dev->dev_link, &fwnet_device_list); 1508 dev_notice(&net->dev, "IP over IEEE 1394 on card %s\n", 1509 dev_name(card->device)); 1510 have_dev: 1511 ret = fwnet_add_peer(dev, unit, device); 1512 if (ret && allocated_netdev) { 1513 unregister_netdev(net); 1514 list_del(&dev->dev_link); 1515 out: 1516 fwnet_fifo_stop(dev); 1517 free_netdev(net); 1518 } 1519 1520 mutex_unlock(&fwnet_device_mutex); 1521 1522 return ret; 1523 } 1524 1525 /* 1526 * FIXME abort partially sent fragmented datagrams, 1527 * discard partially received fragmented datagrams 1528 */ 1529 static void fwnet_update(struct fw_unit *unit) 1530 { 1531 struct fw_device *device = fw_parent_device(unit); 1532 struct fwnet_peer *peer = dev_get_drvdata(&unit->device); 1533 int generation; 1534 1535 generation = device->generation; 1536 1537 spin_lock_irq(&peer->dev->lock); 1538 peer->node_id = device->node_id; 1539 peer->generation = generation; 1540 spin_unlock_irq(&peer->dev->lock); 1541 } 1542 1543 static void fwnet_remove_peer(struct fwnet_peer *peer, struct fwnet_device *dev) 1544 { 1545 struct fwnet_partial_datagram *pd, *pd_next; 1546 1547 spin_lock_irq(&dev->lock); 1548 list_del(&peer->peer_link); 1549 dev->peer_count--; 1550 set_carrier_state(dev); 1551 spin_unlock_irq(&dev->lock); 1552 1553 list_for_each_entry_safe(pd, pd_next, &peer->pd_list, pd_link) 1554 fwnet_pd_delete(pd); 1555 1556 kfree(peer); 1557 } 1558 1559 static void fwnet_remove(struct fw_unit *unit) 1560 { 1561 struct fwnet_peer *peer = dev_get_drvdata(&unit->device); 1562 struct fwnet_device *dev = peer->dev; 1563 struct net_device *net; 1564 int i; 1565 1566 mutex_lock(&fwnet_device_mutex); 1567 1568 net = dev->netdev; 1569 1570 fwnet_remove_peer(peer, dev); 1571 1572 if (list_empty(&dev->peer_list)) { 1573 unregister_netdev(net); 1574 1575 fwnet_fifo_stop(dev); 1576 1577 for (i = 0; dev->queued_datagrams && i < 5; i++) 1578 ssleep(1); 1579 WARN_ON(dev->queued_datagrams); 1580 list_del(&dev->dev_link); 1581 1582 free_netdev(net); 1583 } 1584 1585 mutex_unlock(&fwnet_device_mutex); 1586 } 1587 1588 static const struct ieee1394_device_id fwnet_id_table[] = { 1589 { 1590 .match_flags = IEEE1394_MATCH_SPECIFIER_ID | 1591 IEEE1394_MATCH_VERSION, 1592 .specifier_id = IANA_SPECIFIER_ID, 1593 .version = RFC2734_SW_VERSION, 1594 }, 1595 #if IS_ENABLED(CONFIG_IPV6) 1596 { 1597 .match_flags = IEEE1394_MATCH_SPECIFIER_ID | 1598 IEEE1394_MATCH_VERSION, 1599 .specifier_id = IANA_SPECIFIER_ID, 1600 .version = RFC3146_SW_VERSION, 1601 }, 1602 #endif 1603 { } 1604 }; 1605 1606 static struct fw_driver fwnet_driver = { 1607 .driver = { 1608 .owner = THIS_MODULE, 1609 .name = KBUILD_MODNAME, 1610 .bus = &fw_bus_type, 1611 }, 1612 .probe = fwnet_probe, 1613 .update = fwnet_update, 1614 .remove = fwnet_remove, 1615 .id_table = fwnet_id_table, 1616 }; 1617 1618 static const u32 rfc2374_unit_directory_data[] = { 1619 0x00040000, /* directory_length */ 1620 0x1200005e, /* unit_specifier_id: IANA */ 1621 0x81000003, /* textual descriptor offset */ 1622 0x13000001, /* unit_sw_version: RFC 2734 */ 1623 0x81000005, /* textual descriptor offset */ 1624 0x00030000, /* descriptor_length */ 1625 0x00000000, /* text */ 1626 0x00000000, /* minimal ASCII, en */ 1627 0x49414e41, /* I A N A */ 1628 0x00030000, /* descriptor_length */ 1629 0x00000000, /* text */ 1630 0x00000000, /* minimal ASCII, en */ 1631 0x49507634, /* I P v 4 */ 1632 }; 1633 1634 static struct fw_descriptor rfc2374_unit_directory = { 1635 .length = ARRAY_SIZE(rfc2374_unit_directory_data), 1636 .key = (CSR_DIRECTORY | CSR_UNIT) << 24, 1637 .data = rfc2374_unit_directory_data 1638 }; 1639 1640 #if IS_ENABLED(CONFIG_IPV6) 1641 static const u32 rfc3146_unit_directory_data[] = { 1642 0x00040000, /* directory_length */ 1643 0x1200005e, /* unit_specifier_id: IANA */ 1644 0x81000003, /* textual descriptor offset */ 1645 0x13000002, /* unit_sw_version: RFC 3146 */ 1646 0x81000005, /* textual descriptor offset */ 1647 0x00030000, /* descriptor_length */ 1648 0x00000000, /* text */ 1649 0x00000000, /* minimal ASCII, en */ 1650 0x49414e41, /* I A N A */ 1651 0x00030000, /* descriptor_length */ 1652 0x00000000, /* text */ 1653 0x00000000, /* minimal ASCII, en */ 1654 0x49507636, /* I P v 6 */ 1655 }; 1656 1657 static struct fw_descriptor rfc3146_unit_directory = { 1658 .length = ARRAY_SIZE(rfc3146_unit_directory_data), 1659 .key = (CSR_DIRECTORY | CSR_UNIT) << 24, 1660 .data = rfc3146_unit_directory_data 1661 }; 1662 #endif 1663 1664 static int __init fwnet_init(void) 1665 { 1666 int err; 1667 1668 err = fw_core_add_descriptor(&rfc2374_unit_directory); 1669 if (err) 1670 return err; 1671 1672 #if IS_ENABLED(CONFIG_IPV6) 1673 err = fw_core_add_descriptor(&rfc3146_unit_directory); 1674 if (err) 1675 goto out; 1676 #endif 1677 1678 fwnet_packet_task_cache = kmem_cache_create("packet_task", 1679 sizeof(struct fwnet_packet_task), 0, 0, NULL); 1680 if (!fwnet_packet_task_cache) { 1681 err = -ENOMEM; 1682 goto out2; 1683 } 1684 1685 err = driver_register(&fwnet_driver.driver); 1686 if (!err) 1687 return 0; 1688 1689 kmem_cache_destroy(fwnet_packet_task_cache); 1690 out2: 1691 #if IS_ENABLED(CONFIG_IPV6) 1692 fw_core_remove_descriptor(&rfc3146_unit_directory); 1693 out: 1694 #endif 1695 fw_core_remove_descriptor(&rfc2374_unit_directory); 1696 1697 return err; 1698 } 1699 module_init(fwnet_init); 1700 1701 static void __exit fwnet_cleanup(void) 1702 { 1703 driver_unregister(&fwnet_driver.driver); 1704 kmem_cache_destroy(fwnet_packet_task_cache); 1705 #if IS_ENABLED(CONFIG_IPV6) 1706 fw_core_remove_descriptor(&rfc3146_unit_directory); 1707 #endif 1708 fw_core_remove_descriptor(&rfc2374_unit_directory); 1709 } 1710 module_exit(fwnet_cleanup); 1711 1712 MODULE_AUTHOR("Jay Fenlason <fenlason@redhat.com>"); 1713 MODULE_DESCRIPTION("IP over IEEE1394 as per RFC 2734/3146"); 1714 MODULE_LICENSE("GPL"); 1715 MODULE_DEVICE_TABLE(ieee1394, fwnet_id_table); 1716