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 struct fwnet_device *dev; 492 int status; 493 __be64 guid; 494 495 switch (ether_type) { 496 case ETH_P_ARP: 497 case ETH_P_IP: 498 #if IS_ENABLED(CONFIG_IPV6) 499 case ETH_P_IPV6: 500 #endif 501 break; 502 default: 503 goto err; 504 } 505 506 dev = netdev_priv(net); 507 /* Write metadata, and then pass to the receive level */ 508 skb->dev = net; 509 skb->ip_summed = CHECKSUM_NONE; 510 511 /* 512 * Parse the encapsulation header. This actually does the job of 513 * converting to an ethernet-like pseudo frame header. 514 */ 515 guid = cpu_to_be64(dev->card->guid); 516 if (dev_hard_header(skb, net, ether_type, 517 is_broadcast ? net->broadcast : net->dev_addr, 518 NULL, skb->len) >= 0) { 519 struct fwnet_header *eth; 520 u16 *rawp; 521 __be16 protocol; 522 523 skb_reset_mac_header(skb); 524 skb_pull(skb, sizeof(*eth)); 525 eth = (struct fwnet_header *)skb_mac_header(skb); 526 if (fwnet_hwaddr_is_multicast(eth->h_dest)) { 527 if (memcmp(eth->h_dest, net->broadcast, 528 net->addr_len) == 0) 529 skb->pkt_type = PACKET_BROADCAST; 530 #if 0 531 else 532 skb->pkt_type = PACKET_MULTICAST; 533 #endif 534 } else { 535 if (memcmp(eth->h_dest, net->dev_addr, net->addr_len)) 536 skb->pkt_type = PACKET_OTHERHOST; 537 } 538 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN) { 539 protocol = eth->h_proto; 540 } else { 541 rawp = (u16 *)skb->data; 542 if (*rawp == 0xffff) 543 protocol = htons(ETH_P_802_3); 544 else 545 protocol = htons(ETH_P_802_2); 546 } 547 skb->protocol = protocol; 548 } 549 status = netif_rx(skb); 550 if (status == NET_RX_DROP) { 551 net->stats.rx_errors++; 552 net->stats.rx_dropped++; 553 } else { 554 net->stats.rx_packets++; 555 net->stats.rx_bytes += skb->len; 556 } 557 558 return 0; 559 560 err: 561 net->stats.rx_errors++; 562 net->stats.rx_dropped++; 563 564 dev_kfree_skb_any(skb); 565 566 return -ENOENT; 567 } 568 569 static int fwnet_incoming_packet(struct fwnet_device *dev, __be32 *buf, int len, 570 int source_node_id, int generation, 571 bool is_broadcast) 572 { 573 struct sk_buff *skb; 574 struct net_device *net = dev->netdev; 575 struct rfc2734_header hdr; 576 unsigned lf; 577 unsigned long flags; 578 struct fwnet_peer *peer; 579 struct fwnet_partial_datagram *pd; 580 int fg_off; 581 int dg_size; 582 u16 datagram_label; 583 int retval; 584 u16 ether_type; 585 586 if (len <= RFC2374_UNFRAG_HDR_SIZE) 587 return 0; 588 589 hdr.w0 = be32_to_cpu(buf[0]); 590 lf = fwnet_get_hdr_lf(&hdr); 591 if (lf == RFC2374_HDR_UNFRAG) { 592 /* 593 * An unfragmented datagram has been received by the ieee1394 594 * bus. Build an skbuff around it so we can pass it to the 595 * high level network layer. 596 */ 597 ether_type = fwnet_get_hdr_ether_type(&hdr); 598 buf++; 599 len -= RFC2374_UNFRAG_HDR_SIZE; 600 601 skb = dev_alloc_skb(len + LL_RESERVED_SPACE(net)); 602 if (unlikely(!skb)) { 603 net->stats.rx_dropped++; 604 605 return -ENOMEM; 606 } 607 skb_reserve(skb, LL_RESERVED_SPACE(net)); 608 skb_put_data(skb, buf, len); 609 610 return fwnet_finish_incoming_packet(net, skb, source_node_id, 611 is_broadcast, ether_type); 612 } 613 614 /* A datagram fragment has been received, now the fun begins. */ 615 616 if (len <= RFC2374_FRAG_HDR_SIZE) 617 return 0; 618 619 hdr.w1 = ntohl(buf[1]); 620 buf += 2; 621 len -= RFC2374_FRAG_HDR_SIZE; 622 if (lf == RFC2374_HDR_FIRSTFRAG) { 623 ether_type = fwnet_get_hdr_ether_type(&hdr); 624 fg_off = 0; 625 } else { 626 ether_type = 0; 627 fg_off = fwnet_get_hdr_fg_off(&hdr); 628 } 629 datagram_label = fwnet_get_hdr_dgl(&hdr); 630 dg_size = fwnet_get_hdr_dg_size(&hdr); 631 632 if (fg_off + len > dg_size) 633 return 0; 634 635 spin_lock_irqsave(&dev->lock, flags); 636 637 peer = fwnet_peer_find_by_node_id(dev, source_node_id, generation); 638 if (!peer) { 639 retval = -ENOENT; 640 goto fail; 641 } 642 643 pd = fwnet_pd_find(peer, datagram_label); 644 if (pd == NULL) { 645 while (peer->pdg_size >= FWNET_MAX_FRAGMENTS) { 646 /* remove the oldest */ 647 fwnet_pd_delete(list_first_entry(&peer->pd_list, 648 struct fwnet_partial_datagram, pd_link)); 649 peer->pdg_size--; 650 } 651 pd = fwnet_pd_new(net, peer, datagram_label, 652 dg_size, buf, fg_off, len); 653 if (pd == NULL) { 654 retval = -ENOMEM; 655 goto fail; 656 } 657 peer->pdg_size++; 658 } else { 659 if (fwnet_frag_overlap(pd, fg_off, len) || 660 pd->datagram_size != dg_size) { 661 /* 662 * Differing datagram sizes or overlapping fragments, 663 * discard old datagram and start a new one. 664 */ 665 fwnet_pd_delete(pd); 666 pd = fwnet_pd_new(net, peer, datagram_label, 667 dg_size, buf, fg_off, len); 668 if (pd == NULL) { 669 peer->pdg_size--; 670 retval = -ENOMEM; 671 goto fail; 672 } 673 } else { 674 if (!fwnet_pd_update(peer, pd, buf, fg_off, len)) { 675 /* 676 * Couldn't save off fragment anyway 677 * so might as well obliterate the 678 * datagram now. 679 */ 680 fwnet_pd_delete(pd); 681 peer->pdg_size--; 682 retval = -ENOMEM; 683 goto fail; 684 } 685 } 686 } /* new datagram or add to existing one */ 687 688 if (lf == RFC2374_HDR_FIRSTFRAG) 689 pd->ether_type = ether_type; 690 691 if (fwnet_pd_is_complete(pd)) { 692 ether_type = pd->ether_type; 693 peer->pdg_size--; 694 skb = skb_get(pd->skb); 695 fwnet_pd_delete(pd); 696 697 spin_unlock_irqrestore(&dev->lock, flags); 698 699 return fwnet_finish_incoming_packet(net, skb, source_node_id, 700 false, ether_type); 701 } 702 /* 703 * Datagram is not complete, we're done for the 704 * moment. 705 */ 706 retval = 0; 707 fail: 708 spin_unlock_irqrestore(&dev->lock, flags); 709 710 return retval; 711 } 712 713 static void fwnet_receive_packet(struct fw_card *card, struct fw_request *r, 714 int tcode, int destination, int source, int generation, 715 unsigned long long offset, void *payload, size_t length, 716 void *callback_data) 717 { 718 struct fwnet_device *dev = callback_data; 719 int rcode; 720 721 if (destination == IEEE1394_ALL_NODES) { 722 kfree(r); 723 724 return; 725 } 726 727 if (offset != dev->handler.offset) 728 rcode = RCODE_ADDRESS_ERROR; 729 else if (tcode != TCODE_WRITE_BLOCK_REQUEST) 730 rcode = RCODE_TYPE_ERROR; 731 else if (fwnet_incoming_packet(dev, payload, length, 732 source, generation, false) != 0) { 733 dev_err(&dev->netdev->dev, "incoming packet failure\n"); 734 rcode = RCODE_CONFLICT_ERROR; 735 } else 736 rcode = RCODE_COMPLETE; 737 738 fw_send_response(card, r, rcode); 739 } 740 741 static int gasp_source_id(__be32 *p) 742 { 743 return be32_to_cpu(p[0]) >> 16; 744 } 745 746 static u32 gasp_specifier_id(__be32 *p) 747 { 748 return (be32_to_cpu(p[0]) & 0xffff) << 8 | 749 (be32_to_cpu(p[1]) & 0xff000000) >> 24; 750 } 751 752 static u32 gasp_version(__be32 *p) 753 { 754 return be32_to_cpu(p[1]) & 0xffffff; 755 } 756 757 static void fwnet_receive_broadcast(struct fw_iso_context *context, 758 u32 cycle, size_t header_length, void *header, void *data) 759 { 760 struct fwnet_device *dev; 761 struct fw_iso_packet packet; 762 __be16 *hdr_ptr; 763 __be32 *buf_ptr; 764 int retval; 765 u32 length; 766 unsigned long offset; 767 unsigned long flags; 768 769 dev = data; 770 hdr_ptr = header; 771 length = be16_to_cpup(hdr_ptr); 772 773 spin_lock_irqsave(&dev->lock, flags); 774 775 offset = dev->rcv_buffer_size * dev->broadcast_rcv_next_ptr; 776 buf_ptr = dev->broadcast_rcv_buffer_ptrs[dev->broadcast_rcv_next_ptr++]; 777 if (dev->broadcast_rcv_next_ptr == dev->num_broadcast_rcv_ptrs) 778 dev->broadcast_rcv_next_ptr = 0; 779 780 spin_unlock_irqrestore(&dev->lock, flags); 781 782 if (length > IEEE1394_GASP_HDR_SIZE && 783 gasp_specifier_id(buf_ptr) == IANA_SPECIFIER_ID && 784 (gasp_version(buf_ptr) == RFC2734_SW_VERSION 785 #if IS_ENABLED(CONFIG_IPV6) 786 || gasp_version(buf_ptr) == RFC3146_SW_VERSION 787 #endif 788 )) 789 fwnet_incoming_packet(dev, buf_ptr + 2, 790 length - IEEE1394_GASP_HDR_SIZE, 791 gasp_source_id(buf_ptr), 792 context->card->generation, true); 793 794 packet.payload_length = dev->rcv_buffer_size; 795 packet.interrupt = 1; 796 packet.skip = 0; 797 packet.tag = 3; 798 packet.sy = 0; 799 packet.header_length = IEEE1394_GASP_HDR_SIZE; 800 801 spin_lock_irqsave(&dev->lock, flags); 802 803 retval = fw_iso_context_queue(dev->broadcast_rcv_context, &packet, 804 &dev->broadcast_rcv_buffer, offset); 805 806 spin_unlock_irqrestore(&dev->lock, flags); 807 808 if (retval >= 0) 809 fw_iso_context_queue_flush(dev->broadcast_rcv_context); 810 else 811 dev_err(&dev->netdev->dev, "requeue failed\n"); 812 } 813 814 static struct kmem_cache *fwnet_packet_task_cache; 815 816 static void fwnet_free_ptask(struct fwnet_packet_task *ptask) 817 { 818 dev_kfree_skb_any(ptask->skb); 819 kmem_cache_free(fwnet_packet_task_cache, ptask); 820 } 821 822 /* Caller must hold dev->lock. */ 823 static void dec_queued_datagrams(struct fwnet_device *dev) 824 { 825 if (--dev->queued_datagrams == FWNET_MIN_QUEUED_DATAGRAMS) 826 netif_wake_queue(dev->netdev); 827 } 828 829 static int fwnet_send_packet(struct fwnet_packet_task *ptask); 830 831 static void fwnet_transmit_packet_done(struct fwnet_packet_task *ptask) 832 { 833 struct fwnet_device *dev = ptask->dev; 834 struct sk_buff *skb = ptask->skb; 835 unsigned long flags; 836 bool free; 837 838 spin_lock_irqsave(&dev->lock, flags); 839 840 ptask->outstanding_pkts--; 841 842 /* Check whether we or the networking TX soft-IRQ is last user. */ 843 free = (ptask->outstanding_pkts == 0 && ptask->enqueued); 844 if (free) 845 dec_queued_datagrams(dev); 846 847 if (ptask->outstanding_pkts == 0) { 848 dev->netdev->stats.tx_packets++; 849 dev->netdev->stats.tx_bytes += skb->len; 850 } 851 852 spin_unlock_irqrestore(&dev->lock, flags); 853 854 if (ptask->outstanding_pkts > 0) { 855 u16 dg_size; 856 u16 fg_off; 857 u16 datagram_label; 858 u16 lf; 859 860 /* Update the ptask to point to the next fragment and send it */ 861 lf = fwnet_get_hdr_lf(&ptask->hdr); 862 switch (lf) { 863 case RFC2374_HDR_LASTFRAG: 864 case RFC2374_HDR_UNFRAG: 865 default: 866 dev_err(&dev->netdev->dev, 867 "outstanding packet %x lf %x, header %x,%x\n", 868 ptask->outstanding_pkts, lf, ptask->hdr.w0, 869 ptask->hdr.w1); 870 BUG(); 871 872 case RFC2374_HDR_FIRSTFRAG: 873 /* Set frag type here for future interior fragments */ 874 dg_size = fwnet_get_hdr_dg_size(&ptask->hdr); 875 fg_off = ptask->max_payload - RFC2374_FRAG_HDR_SIZE; 876 datagram_label = fwnet_get_hdr_dgl(&ptask->hdr); 877 break; 878 879 case RFC2374_HDR_INTFRAG: 880 dg_size = fwnet_get_hdr_dg_size(&ptask->hdr); 881 fg_off = fwnet_get_hdr_fg_off(&ptask->hdr) 882 + ptask->max_payload - RFC2374_FRAG_HDR_SIZE; 883 datagram_label = fwnet_get_hdr_dgl(&ptask->hdr); 884 break; 885 } 886 887 if (ptask->dest_node == IEEE1394_ALL_NODES) { 888 skb_pull(skb, 889 ptask->max_payload + IEEE1394_GASP_HDR_SIZE); 890 } else { 891 skb_pull(skb, ptask->max_payload); 892 } 893 if (ptask->outstanding_pkts > 1) { 894 fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_INTFRAG, 895 dg_size, fg_off, datagram_label); 896 } else { 897 fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_LASTFRAG, 898 dg_size, fg_off, datagram_label); 899 ptask->max_payload = skb->len + RFC2374_FRAG_HDR_SIZE; 900 } 901 fwnet_send_packet(ptask); 902 } 903 904 if (free) 905 fwnet_free_ptask(ptask); 906 } 907 908 static void fwnet_transmit_packet_failed(struct fwnet_packet_task *ptask) 909 { 910 struct fwnet_device *dev = ptask->dev; 911 unsigned long flags; 912 bool free; 913 914 spin_lock_irqsave(&dev->lock, flags); 915 916 /* One fragment failed; don't try to send remaining fragments. */ 917 ptask->outstanding_pkts = 0; 918 919 /* Check whether we or the networking TX soft-IRQ is last user. */ 920 free = ptask->enqueued; 921 if (free) 922 dec_queued_datagrams(dev); 923 924 dev->netdev->stats.tx_dropped++; 925 dev->netdev->stats.tx_errors++; 926 927 spin_unlock_irqrestore(&dev->lock, flags); 928 929 if (free) 930 fwnet_free_ptask(ptask); 931 } 932 933 static void fwnet_write_complete(struct fw_card *card, int rcode, 934 void *payload, size_t length, void *data) 935 { 936 struct fwnet_packet_task *ptask = data; 937 static unsigned long j; 938 static int last_rcode, errors_skipped; 939 940 if (rcode == RCODE_COMPLETE) { 941 fwnet_transmit_packet_done(ptask); 942 } else { 943 if (printk_timed_ratelimit(&j, 1000) || rcode != last_rcode) { 944 dev_err(&ptask->dev->netdev->dev, 945 "fwnet_write_complete failed: %x (skipped %d)\n", 946 rcode, errors_skipped); 947 948 errors_skipped = 0; 949 last_rcode = rcode; 950 } else { 951 errors_skipped++; 952 } 953 fwnet_transmit_packet_failed(ptask); 954 } 955 } 956 957 static int fwnet_send_packet(struct fwnet_packet_task *ptask) 958 { 959 struct fwnet_device *dev; 960 unsigned tx_len; 961 struct rfc2734_header *bufhdr; 962 unsigned long flags; 963 bool free; 964 965 dev = ptask->dev; 966 tx_len = ptask->max_payload; 967 switch (fwnet_get_hdr_lf(&ptask->hdr)) { 968 case RFC2374_HDR_UNFRAG: 969 bufhdr = skb_push(ptask->skb, RFC2374_UNFRAG_HDR_SIZE); 970 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0); 971 break; 972 973 case RFC2374_HDR_FIRSTFRAG: 974 case RFC2374_HDR_INTFRAG: 975 case RFC2374_HDR_LASTFRAG: 976 bufhdr = skb_push(ptask->skb, RFC2374_FRAG_HDR_SIZE); 977 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0); 978 put_unaligned_be32(ptask->hdr.w1, &bufhdr->w1); 979 break; 980 981 default: 982 BUG(); 983 } 984 if (ptask->dest_node == IEEE1394_ALL_NODES) { 985 u8 *p; 986 int generation; 987 int node_id; 988 unsigned int sw_version; 989 990 /* ptask->generation may not have been set yet */ 991 generation = dev->card->generation; 992 smp_rmb(); 993 node_id = dev->card->node_id; 994 995 switch (ptask->skb->protocol) { 996 default: 997 sw_version = RFC2734_SW_VERSION; 998 break; 999 #if IS_ENABLED(CONFIG_IPV6) 1000 case htons(ETH_P_IPV6): 1001 sw_version = RFC3146_SW_VERSION; 1002 #endif 1003 } 1004 1005 p = skb_push(ptask->skb, IEEE1394_GASP_HDR_SIZE); 1006 put_unaligned_be32(node_id << 16 | IANA_SPECIFIER_ID >> 8, p); 1007 put_unaligned_be32((IANA_SPECIFIER_ID & 0xff) << 24 1008 | sw_version, &p[4]); 1009 1010 /* We should not transmit if broadcast_channel.valid == 0. */ 1011 fw_send_request(dev->card, &ptask->transaction, 1012 TCODE_STREAM_DATA, 1013 fw_stream_packet_destination_id(3, 1014 IEEE1394_BROADCAST_CHANNEL, 0), 1015 generation, SCODE_100, 0ULL, ptask->skb->data, 1016 tx_len + 8, fwnet_write_complete, ptask); 1017 1018 spin_lock_irqsave(&dev->lock, flags); 1019 1020 /* If the AT tasklet already ran, we may be last user. */ 1021 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued); 1022 if (!free) 1023 ptask->enqueued = true; 1024 else 1025 dec_queued_datagrams(dev); 1026 1027 spin_unlock_irqrestore(&dev->lock, flags); 1028 1029 goto out; 1030 } 1031 1032 fw_send_request(dev->card, &ptask->transaction, 1033 TCODE_WRITE_BLOCK_REQUEST, ptask->dest_node, 1034 ptask->generation, ptask->speed, ptask->fifo_addr, 1035 ptask->skb->data, tx_len, fwnet_write_complete, ptask); 1036 1037 spin_lock_irqsave(&dev->lock, flags); 1038 1039 /* If the AT tasklet already ran, we may be last user. */ 1040 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued); 1041 if (!free) 1042 ptask->enqueued = true; 1043 else 1044 dec_queued_datagrams(dev); 1045 1046 spin_unlock_irqrestore(&dev->lock, flags); 1047 1048 netif_trans_update(dev->netdev); 1049 out: 1050 if (free) 1051 fwnet_free_ptask(ptask); 1052 1053 return 0; 1054 } 1055 1056 static void fwnet_fifo_stop(struct fwnet_device *dev) 1057 { 1058 if (dev->local_fifo == FWNET_NO_FIFO_ADDR) 1059 return; 1060 1061 fw_core_remove_address_handler(&dev->handler); 1062 dev->local_fifo = FWNET_NO_FIFO_ADDR; 1063 } 1064 1065 static int fwnet_fifo_start(struct fwnet_device *dev) 1066 { 1067 int retval; 1068 1069 if (dev->local_fifo != FWNET_NO_FIFO_ADDR) 1070 return 0; 1071 1072 dev->handler.length = 4096; 1073 dev->handler.address_callback = fwnet_receive_packet; 1074 dev->handler.callback_data = dev; 1075 1076 retval = fw_core_add_address_handler(&dev->handler, 1077 &fw_high_memory_region); 1078 if (retval < 0) 1079 return retval; 1080 1081 dev->local_fifo = dev->handler.offset; 1082 1083 return 0; 1084 } 1085 1086 static void __fwnet_broadcast_stop(struct fwnet_device *dev) 1087 { 1088 unsigned u; 1089 1090 if (dev->broadcast_state != FWNET_BROADCAST_ERROR) { 1091 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++) 1092 kunmap(dev->broadcast_rcv_buffer.pages[u]); 1093 fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer, dev->card); 1094 } 1095 if (dev->broadcast_rcv_context) { 1096 fw_iso_context_destroy(dev->broadcast_rcv_context); 1097 dev->broadcast_rcv_context = NULL; 1098 } 1099 kfree(dev->broadcast_rcv_buffer_ptrs); 1100 dev->broadcast_rcv_buffer_ptrs = NULL; 1101 dev->broadcast_state = FWNET_BROADCAST_ERROR; 1102 } 1103 1104 static void fwnet_broadcast_stop(struct fwnet_device *dev) 1105 { 1106 if (dev->broadcast_state == FWNET_BROADCAST_ERROR) 1107 return; 1108 fw_iso_context_stop(dev->broadcast_rcv_context); 1109 __fwnet_broadcast_stop(dev); 1110 } 1111 1112 static int fwnet_broadcast_start(struct fwnet_device *dev) 1113 { 1114 struct fw_iso_context *context; 1115 int retval; 1116 unsigned num_packets; 1117 unsigned max_receive; 1118 struct fw_iso_packet packet; 1119 unsigned long offset; 1120 void **ptrptr; 1121 unsigned u; 1122 1123 if (dev->broadcast_state != FWNET_BROADCAST_ERROR) 1124 return 0; 1125 1126 max_receive = 1U << (dev->card->max_receive + 1); 1127 num_packets = (FWNET_ISO_PAGE_COUNT * PAGE_SIZE) / max_receive; 1128 1129 ptrptr = kmalloc_array(num_packets, sizeof(void *), GFP_KERNEL); 1130 if (!ptrptr) { 1131 retval = -ENOMEM; 1132 goto failed; 1133 } 1134 dev->broadcast_rcv_buffer_ptrs = ptrptr; 1135 1136 context = fw_iso_context_create(dev->card, FW_ISO_CONTEXT_RECEIVE, 1137 IEEE1394_BROADCAST_CHANNEL, 1138 dev->card->link_speed, 8, 1139 fwnet_receive_broadcast, dev); 1140 if (IS_ERR(context)) { 1141 retval = PTR_ERR(context); 1142 goto failed; 1143 } 1144 1145 retval = fw_iso_buffer_init(&dev->broadcast_rcv_buffer, dev->card, 1146 FWNET_ISO_PAGE_COUNT, DMA_FROM_DEVICE); 1147 if (retval < 0) 1148 goto failed; 1149 1150 dev->broadcast_state = FWNET_BROADCAST_STOPPED; 1151 1152 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++) { 1153 void *ptr; 1154 unsigned v; 1155 1156 ptr = kmap(dev->broadcast_rcv_buffer.pages[u]); 1157 for (v = 0; v < num_packets / FWNET_ISO_PAGE_COUNT; v++) 1158 *ptrptr++ = (void *) ((char *)ptr + v * max_receive); 1159 } 1160 dev->broadcast_rcv_context = context; 1161 1162 packet.payload_length = max_receive; 1163 packet.interrupt = 1; 1164 packet.skip = 0; 1165 packet.tag = 3; 1166 packet.sy = 0; 1167 packet.header_length = IEEE1394_GASP_HDR_SIZE; 1168 offset = 0; 1169 1170 for (u = 0; u < num_packets; u++) { 1171 retval = fw_iso_context_queue(context, &packet, 1172 &dev->broadcast_rcv_buffer, offset); 1173 if (retval < 0) 1174 goto failed; 1175 1176 offset += max_receive; 1177 } 1178 dev->num_broadcast_rcv_ptrs = num_packets; 1179 dev->rcv_buffer_size = max_receive; 1180 dev->broadcast_rcv_next_ptr = 0U; 1181 retval = fw_iso_context_start(context, -1, 0, 1182 FW_ISO_CONTEXT_MATCH_ALL_TAGS); /* ??? sync */ 1183 if (retval < 0) 1184 goto failed; 1185 1186 /* FIXME: adjust it according to the min. speed of all known peers? */ 1187 dev->broadcast_xmt_max_payload = IEEE1394_MAX_PAYLOAD_S100 1188 - IEEE1394_GASP_HDR_SIZE - RFC2374_UNFRAG_HDR_SIZE; 1189 dev->broadcast_state = FWNET_BROADCAST_RUNNING; 1190 1191 return 0; 1192 1193 failed: 1194 __fwnet_broadcast_stop(dev); 1195 return retval; 1196 } 1197 1198 static void set_carrier_state(struct fwnet_device *dev) 1199 { 1200 if (dev->peer_count > 1) 1201 netif_carrier_on(dev->netdev); 1202 else 1203 netif_carrier_off(dev->netdev); 1204 } 1205 1206 /* ifup */ 1207 static int fwnet_open(struct net_device *net) 1208 { 1209 struct fwnet_device *dev = netdev_priv(net); 1210 int ret; 1211 1212 ret = fwnet_broadcast_start(dev); 1213 if (ret) 1214 return ret; 1215 1216 netif_start_queue(net); 1217 1218 spin_lock_irq(&dev->lock); 1219 set_carrier_state(dev); 1220 spin_unlock_irq(&dev->lock); 1221 1222 return 0; 1223 } 1224 1225 /* ifdown */ 1226 static int fwnet_stop(struct net_device *net) 1227 { 1228 struct fwnet_device *dev = netdev_priv(net); 1229 1230 netif_stop_queue(net); 1231 fwnet_broadcast_stop(dev); 1232 1233 return 0; 1234 } 1235 1236 static netdev_tx_t fwnet_tx(struct sk_buff *skb, struct net_device *net) 1237 { 1238 struct fwnet_header hdr_buf; 1239 struct fwnet_device *dev = netdev_priv(net); 1240 __be16 proto; 1241 u16 dest_node; 1242 unsigned max_payload; 1243 u16 dg_size; 1244 u16 *datagram_label_ptr; 1245 struct fwnet_packet_task *ptask; 1246 struct fwnet_peer *peer; 1247 unsigned long flags; 1248 1249 spin_lock_irqsave(&dev->lock, flags); 1250 1251 /* Can this happen? */ 1252 if (netif_queue_stopped(dev->netdev)) { 1253 spin_unlock_irqrestore(&dev->lock, flags); 1254 1255 return NETDEV_TX_BUSY; 1256 } 1257 1258 ptask = kmem_cache_alloc(fwnet_packet_task_cache, GFP_ATOMIC); 1259 if (ptask == NULL) 1260 goto fail; 1261 1262 skb = skb_share_check(skb, GFP_ATOMIC); 1263 if (!skb) 1264 goto fail; 1265 1266 /* 1267 * Make a copy of the driver-specific header. 1268 * We might need to rebuild the header on tx failure. 1269 */ 1270 memcpy(&hdr_buf, skb->data, sizeof(hdr_buf)); 1271 proto = hdr_buf.h_proto; 1272 1273 switch (proto) { 1274 case htons(ETH_P_ARP): 1275 case htons(ETH_P_IP): 1276 #if IS_ENABLED(CONFIG_IPV6) 1277 case htons(ETH_P_IPV6): 1278 #endif 1279 break; 1280 default: 1281 goto fail; 1282 } 1283 1284 skb_pull(skb, sizeof(hdr_buf)); 1285 dg_size = skb->len; 1286 1287 /* 1288 * Set the transmission type for the packet. ARP packets and IP 1289 * broadcast packets are sent via GASP. 1290 */ 1291 if (fwnet_hwaddr_is_multicast(hdr_buf.h_dest)) { 1292 max_payload = dev->broadcast_xmt_max_payload; 1293 datagram_label_ptr = &dev->broadcast_xmt_datagramlabel; 1294 1295 ptask->fifo_addr = FWNET_NO_FIFO_ADDR; 1296 ptask->generation = 0; 1297 ptask->dest_node = IEEE1394_ALL_NODES; 1298 ptask->speed = SCODE_100; 1299 } else { 1300 union fwnet_hwaddr *ha = (union fwnet_hwaddr *)hdr_buf.h_dest; 1301 __be64 guid = get_unaligned(&ha->uc.uniq_id); 1302 u8 generation; 1303 1304 peer = fwnet_peer_find_by_guid(dev, be64_to_cpu(guid)); 1305 if (!peer) 1306 goto fail; 1307 1308 generation = peer->generation; 1309 dest_node = peer->node_id; 1310 max_payload = peer->max_payload; 1311 datagram_label_ptr = &peer->datagram_label; 1312 1313 ptask->fifo_addr = fwnet_hwaddr_fifo(ha); 1314 ptask->generation = generation; 1315 ptask->dest_node = dest_node; 1316 ptask->speed = peer->speed; 1317 } 1318 1319 ptask->hdr.w0 = 0; 1320 ptask->hdr.w1 = 0; 1321 ptask->skb = skb; 1322 ptask->dev = dev; 1323 1324 /* Does it all fit in one packet? */ 1325 if (dg_size <= max_payload) { 1326 fwnet_make_uf_hdr(&ptask->hdr, ntohs(proto)); 1327 ptask->outstanding_pkts = 1; 1328 max_payload = dg_size + RFC2374_UNFRAG_HDR_SIZE; 1329 } else { 1330 u16 datagram_label; 1331 1332 max_payload -= RFC2374_FRAG_OVERHEAD; 1333 datagram_label = (*datagram_label_ptr)++; 1334 fwnet_make_ff_hdr(&ptask->hdr, ntohs(proto), dg_size, 1335 datagram_label); 1336 ptask->outstanding_pkts = DIV_ROUND_UP(dg_size, max_payload); 1337 max_payload += RFC2374_FRAG_HDR_SIZE; 1338 } 1339 1340 if (++dev->queued_datagrams == FWNET_MAX_QUEUED_DATAGRAMS) 1341 netif_stop_queue(dev->netdev); 1342 1343 spin_unlock_irqrestore(&dev->lock, flags); 1344 1345 ptask->max_payload = max_payload; 1346 ptask->enqueued = 0; 1347 1348 fwnet_send_packet(ptask); 1349 1350 return NETDEV_TX_OK; 1351 1352 fail: 1353 spin_unlock_irqrestore(&dev->lock, flags); 1354 1355 if (ptask) 1356 kmem_cache_free(fwnet_packet_task_cache, ptask); 1357 1358 if (skb != NULL) 1359 dev_kfree_skb(skb); 1360 1361 net->stats.tx_dropped++; 1362 net->stats.tx_errors++; 1363 1364 /* 1365 * FIXME: According to a patch from 2003-02-26, "returning non-zero 1366 * causes serious problems" here, allegedly. Before that patch, 1367 * -ERRNO was returned which is not appropriate under Linux 2.6. 1368 * Perhaps more needs to be done? Stop the queue in serious 1369 * conditions and restart it elsewhere? 1370 */ 1371 return NETDEV_TX_OK; 1372 } 1373 1374 static const struct ethtool_ops fwnet_ethtool_ops = { 1375 .get_link = ethtool_op_get_link, 1376 }; 1377 1378 static const struct net_device_ops fwnet_netdev_ops = { 1379 .ndo_open = fwnet_open, 1380 .ndo_stop = fwnet_stop, 1381 .ndo_start_xmit = fwnet_tx, 1382 }; 1383 1384 static void fwnet_init_dev(struct net_device *net) 1385 { 1386 net->header_ops = &fwnet_header_ops; 1387 net->netdev_ops = &fwnet_netdev_ops; 1388 net->watchdog_timeo = 2 * HZ; 1389 net->flags = IFF_BROADCAST | IFF_MULTICAST; 1390 net->features = NETIF_F_HIGHDMA; 1391 net->addr_len = FWNET_ALEN; 1392 net->hard_header_len = FWNET_HLEN; 1393 net->type = ARPHRD_IEEE1394; 1394 net->tx_queue_len = FWNET_TX_QUEUE_LEN; 1395 net->ethtool_ops = &fwnet_ethtool_ops; 1396 } 1397 1398 /* caller must hold fwnet_device_mutex */ 1399 static struct fwnet_device *fwnet_dev_find(struct fw_card *card) 1400 { 1401 struct fwnet_device *dev; 1402 1403 list_for_each_entry(dev, &fwnet_device_list, dev_link) 1404 if (dev->card == card) 1405 return dev; 1406 1407 return NULL; 1408 } 1409 1410 static int fwnet_add_peer(struct fwnet_device *dev, 1411 struct fw_unit *unit, struct fw_device *device) 1412 { 1413 struct fwnet_peer *peer; 1414 1415 peer = kmalloc(sizeof(*peer), GFP_KERNEL); 1416 if (!peer) 1417 return -ENOMEM; 1418 1419 dev_set_drvdata(&unit->device, peer); 1420 1421 peer->dev = dev; 1422 peer->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4]; 1423 INIT_LIST_HEAD(&peer->pd_list); 1424 peer->pdg_size = 0; 1425 peer->datagram_label = 0; 1426 peer->speed = device->max_speed; 1427 peer->max_payload = fwnet_max_payload(device->max_rec, peer->speed); 1428 1429 peer->generation = device->generation; 1430 smp_rmb(); 1431 peer->node_id = device->node_id; 1432 1433 spin_lock_irq(&dev->lock); 1434 list_add_tail(&peer->peer_link, &dev->peer_list); 1435 dev->peer_count++; 1436 set_carrier_state(dev); 1437 spin_unlock_irq(&dev->lock); 1438 1439 return 0; 1440 } 1441 1442 static int fwnet_probe(struct fw_unit *unit, 1443 const struct ieee1394_device_id *id) 1444 { 1445 struct fw_device *device = fw_parent_device(unit); 1446 struct fw_card *card = device->card; 1447 struct net_device *net; 1448 bool allocated_netdev = false; 1449 struct fwnet_device *dev; 1450 int ret; 1451 union fwnet_hwaddr *ha; 1452 1453 mutex_lock(&fwnet_device_mutex); 1454 1455 dev = fwnet_dev_find(card); 1456 if (dev) { 1457 net = dev->netdev; 1458 goto have_dev; 1459 } 1460 1461 net = alloc_netdev(sizeof(*dev), "firewire%d", NET_NAME_UNKNOWN, 1462 fwnet_init_dev); 1463 if (net == NULL) { 1464 mutex_unlock(&fwnet_device_mutex); 1465 return -ENOMEM; 1466 } 1467 1468 allocated_netdev = true; 1469 SET_NETDEV_DEV(net, card->device); 1470 dev = netdev_priv(net); 1471 1472 spin_lock_init(&dev->lock); 1473 dev->broadcast_state = FWNET_BROADCAST_ERROR; 1474 dev->broadcast_rcv_context = NULL; 1475 dev->broadcast_xmt_max_payload = 0; 1476 dev->broadcast_xmt_datagramlabel = 0; 1477 dev->local_fifo = FWNET_NO_FIFO_ADDR; 1478 dev->queued_datagrams = 0; 1479 INIT_LIST_HEAD(&dev->peer_list); 1480 dev->card = card; 1481 dev->netdev = net; 1482 1483 ret = fwnet_fifo_start(dev); 1484 if (ret < 0) 1485 goto out; 1486 dev->local_fifo = dev->handler.offset; 1487 1488 /* 1489 * default MTU: RFC 2734 cl. 4, RFC 3146 cl. 4 1490 * maximum MTU: RFC 2734 cl. 4.2, fragment encapsulation header's 1491 * maximum possible datagram_size + 1 = 0xfff + 1 1492 */ 1493 net->mtu = 1500U; 1494 net->min_mtu = ETH_MIN_MTU; 1495 net->max_mtu = 4096U; 1496 1497 /* Set our hardware address while we're at it */ 1498 ha = (union fwnet_hwaddr *)net->dev_addr; 1499 put_unaligned_be64(card->guid, &ha->uc.uniq_id); 1500 ha->uc.max_rec = dev->card->max_receive; 1501 ha->uc.sspd = dev->card->link_speed; 1502 put_unaligned_be16(dev->local_fifo >> 32, &ha->uc.fifo_hi); 1503 put_unaligned_be32(dev->local_fifo & 0xffffffff, &ha->uc.fifo_lo); 1504 1505 memset(net->broadcast, -1, net->addr_len); 1506 1507 ret = register_netdev(net); 1508 if (ret) 1509 goto out; 1510 1511 list_add_tail(&dev->dev_link, &fwnet_device_list); 1512 dev_notice(&net->dev, "IP over IEEE 1394 on card %s\n", 1513 dev_name(card->device)); 1514 have_dev: 1515 ret = fwnet_add_peer(dev, unit, device); 1516 if (ret && allocated_netdev) { 1517 unregister_netdev(net); 1518 list_del(&dev->dev_link); 1519 out: 1520 fwnet_fifo_stop(dev); 1521 free_netdev(net); 1522 } 1523 1524 mutex_unlock(&fwnet_device_mutex); 1525 1526 return ret; 1527 } 1528 1529 /* 1530 * FIXME abort partially sent fragmented datagrams, 1531 * discard partially received fragmented datagrams 1532 */ 1533 static void fwnet_update(struct fw_unit *unit) 1534 { 1535 struct fw_device *device = fw_parent_device(unit); 1536 struct fwnet_peer *peer = dev_get_drvdata(&unit->device); 1537 int generation; 1538 1539 generation = device->generation; 1540 1541 spin_lock_irq(&peer->dev->lock); 1542 peer->node_id = device->node_id; 1543 peer->generation = generation; 1544 spin_unlock_irq(&peer->dev->lock); 1545 } 1546 1547 static void fwnet_remove_peer(struct fwnet_peer *peer, struct fwnet_device *dev) 1548 { 1549 struct fwnet_partial_datagram *pd, *pd_next; 1550 1551 spin_lock_irq(&dev->lock); 1552 list_del(&peer->peer_link); 1553 dev->peer_count--; 1554 set_carrier_state(dev); 1555 spin_unlock_irq(&dev->lock); 1556 1557 list_for_each_entry_safe(pd, pd_next, &peer->pd_list, pd_link) 1558 fwnet_pd_delete(pd); 1559 1560 kfree(peer); 1561 } 1562 1563 static void fwnet_remove(struct fw_unit *unit) 1564 { 1565 struct fwnet_peer *peer = dev_get_drvdata(&unit->device); 1566 struct fwnet_device *dev = peer->dev; 1567 struct net_device *net; 1568 int i; 1569 1570 mutex_lock(&fwnet_device_mutex); 1571 1572 net = dev->netdev; 1573 1574 fwnet_remove_peer(peer, dev); 1575 1576 if (list_empty(&dev->peer_list)) { 1577 unregister_netdev(net); 1578 1579 fwnet_fifo_stop(dev); 1580 1581 for (i = 0; dev->queued_datagrams && i < 5; i++) 1582 ssleep(1); 1583 WARN_ON(dev->queued_datagrams); 1584 list_del(&dev->dev_link); 1585 1586 free_netdev(net); 1587 } 1588 1589 mutex_unlock(&fwnet_device_mutex); 1590 } 1591 1592 static const struct ieee1394_device_id fwnet_id_table[] = { 1593 { 1594 .match_flags = IEEE1394_MATCH_SPECIFIER_ID | 1595 IEEE1394_MATCH_VERSION, 1596 .specifier_id = IANA_SPECIFIER_ID, 1597 .version = RFC2734_SW_VERSION, 1598 }, 1599 #if IS_ENABLED(CONFIG_IPV6) 1600 { 1601 .match_flags = IEEE1394_MATCH_SPECIFIER_ID | 1602 IEEE1394_MATCH_VERSION, 1603 .specifier_id = IANA_SPECIFIER_ID, 1604 .version = RFC3146_SW_VERSION, 1605 }, 1606 #endif 1607 { } 1608 }; 1609 1610 static struct fw_driver fwnet_driver = { 1611 .driver = { 1612 .owner = THIS_MODULE, 1613 .name = KBUILD_MODNAME, 1614 .bus = &fw_bus_type, 1615 }, 1616 .probe = fwnet_probe, 1617 .update = fwnet_update, 1618 .remove = fwnet_remove, 1619 .id_table = fwnet_id_table, 1620 }; 1621 1622 static const u32 rfc2374_unit_directory_data[] = { 1623 0x00040000, /* directory_length */ 1624 0x1200005e, /* unit_specifier_id: IANA */ 1625 0x81000003, /* textual descriptor offset */ 1626 0x13000001, /* unit_sw_version: RFC 2734 */ 1627 0x81000005, /* textual descriptor offset */ 1628 0x00030000, /* descriptor_length */ 1629 0x00000000, /* text */ 1630 0x00000000, /* minimal ASCII, en */ 1631 0x49414e41, /* I A N A */ 1632 0x00030000, /* descriptor_length */ 1633 0x00000000, /* text */ 1634 0x00000000, /* minimal ASCII, en */ 1635 0x49507634, /* I P v 4 */ 1636 }; 1637 1638 static struct fw_descriptor rfc2374_unit_directory = { 1639 .length = ARRAY_SIZE(rfc2374_unit_directory_data), 1640 .key = (CSR_DIRECTORY | CSR_UNIT) << 24, 1641 .data = rfc2374_unit_directory_data 1642 }; 1643 1644 #if IS_ENABLED(CONFIG_IPV6) 1645 static const u32 rfc3146_unit_directory_data[] = { 1646 0x00040000, /* directory_length */ 1647 0x1200005e, /* unit_specifier_id: IANA */ 1648 0x81000003, /* textual descriptor offset */ 1649 0x13000002, /* unit_sw_version: RFC 3146 */ 1650 0x81000005, /* textual descriptor offset */ 1651 0x00030000, /* descriptor_length */ 1652 0x00000000, /* text */ 1653 0x00000000, /* minimal ASCII, en */ 1654 0x49414e41, /* I A N A */ 1655 0x00030000, /* descriptor_length */ 1656 0x00000000, /* text */ 1657 0x00000000, /* minimal ASCII, en */ 1658 0x49507636, /* I P v 6 */ 1659 }; 1660 1661 static struct fw_descriptor rfc3146_unit_directory = { 1662 .length = ARRAY_SIZE(rfc3146_unit_directory_data), 1663 .key = (CSR_DIRECTORY | CSR_UNIT) << 24, 1664 .data = rfc3146_unit_directory_data 1665 }; 1666 #endif 1667 1668 static int __init fwnet_init(void) 1669 { 1670 int err; 1671 1672 err = fw_core_add_descriptor(&rfc2374_unit_directory); 1673 if (err) 1674 return err; 1675 1676 #if IS_ENABLED(CONFIG_IPV6) 1677 err = fw_core_add_descriptor(&rfc3146_unit_directory); 1678 if (err) 1679 goto out; 1680 #endif 1681 1682 fwnet_packet_task_cache = kmem_cache_create("packet_task", 1683 sizeof(struct fwnet_packet_task), 0, 0, NULL); 1684 if (!fwnet_packet_task_cache) { 1685 err = -ENOMEM; 1686 goto out2; 1687 } 1688 1689 err = driver_register(&fwnet_driver.driver); 1690 if (!err) 1691 return 0; 1692 1693 kmem_cache_destroy(fwnet_packet_task_cache); 1694 out2: 1695 #if IS_ENABLED(CONFIG_IPV6) 1696 fw_core_remove_descriptor(&rfc3146_unit_directory); 1697 out: 1698 #endif 1699 fw_core_remove_descriptor(&rfc2374_unit_directory); 1700 1701 return err; 1702 } 1703 module_init(fwnet_init); 1704 1705 static void __exit fwnet_cleanup(void) 1706 { 1707 driver_unregister(&fwnet_driver.driver); 1708 kmem_cache_destroy(fwnet_packet_task_cache); 1709 #if IS_ENABLED(CONFIG_IPV6) 1710 fw_core_remove_descriptor(&rfc3146_unit_directory); 1711 #endif 1712 fw_core_remove_descriptor(&rfc2374_unit_directory); 1713 } 1714 module_exit(fwnet_cleanup); 1715 1716 MODULE_AUTHOR("Jay Fenlason <fenlason@redhat.com>"); 1717 MODULE_DESCRIPTION("IP over IEEE1394 as per RFC 2734/3146"); 1718 MODULE_LICENSE("GPL"); 1719 MODULE_DEVICE_TABLE(ieee1394, fwnet_id_table); 1720