1/* 2 * IPv4 over IEEE 1394, per RFC 2734 3 * 4 * Copyright (C) 2009 Jay Fenlason <fenlason@redhat.com> 5 * 6 * based on eth1394 by Ben Collins et al 7 */ 8 9#include <linux/bug.h> 10#include <linux/device.h> 11#include <linux/ethtool.h> 12#include <linux/firewire.h> 13#include <linux/firewire-constants.h> 14#include <linux/highmem.h> 15#include <linux/in.h> 16#include <linux/ip.h> 17#include <linux/jiffies.h> 18#include <linux/mod_devicetable.h> 19#include <linux/module.h> 20#include <linux/moduleparam.h> 21#include <linux/mutex.h> 22#include <linux/netdevice.h> 23#include <linux/skbuff.h> 24#include <linux/slab.h> 25#include <linux/spinlock.h> 26 27#include <asm/unaligned.h> 28#include <net/arp.h> 29 30#define FWNET_MAX_FRAGMENTS 25 /* arbitrary limit */ 31#define FWNET_ISO_PAGE_COUNT (PAGE_SIZE < 16 * 1024 ? 4 : 2) 32 33#define IEEE1394_BROADCAST_CHANNEL 31 34#define IEEE1394_ALL_NODES (0xffc0 | 0x003f) 35#define IEEE1394_MAX_PAYLOAD_S100 512 36#define FWNET_NO_FIFO_ADDR (~0ULL) 37 38#define IANA_SPECIFIER_ID 0x00005eU 39#define RFC2734_SW_VERSION 0x000001U 40 41#define IEEE1394_GASP_HDR_SIZE 8 42 43#define RFC2374_UNFRAG_HDR_SIZE 4 44#define RFC2374_FRAG_HDR_SIZE 8 45#define RFC2374_FRAG_OVERHEAD 4 46 47#define RFC2374_HDR_UNFRAG 0 /* unfragmented */ 48#define RFC2374_HDR_FIRSTFRAG 1 /* first fragment */ 49#define RFC2374_HDR_LASTFRAG 2 /* last fragment */ 50#define RFC2374_HDR_INTFRAG 3 /* interior fragment */ 51 52#define RFC2734_HW_ADDR_LEN 16 53 54struct rfc2734_arp { 55 __be16 hw_type; /* 0x0018 */ 56 __be16 proto_type; /* 0x0806 */ 57 u8 hw_addr_len; /* 16 */ 58 u8 ip_addr_len; /* 4 */ 59 __be16 opcode; /* ARP Opcode */ 60 /* Above is exactly the same format as struct arphdr */ 61 62 __be64 s_uniq_id; /* Sender's 64bit EUI */ 63 u8 max_rec; /* Sender's max packet size */ 64 u8 sspd; /* Sender's max speed */ 65 __be16 fifo_hi; /* hi 16bits of sender's FIFO addr */ 66 __be32 fifo_lo; /* lo 32bits of sender's FIFO addr */ 67 __be32 sip; /* Sender's IP Address */ 68 __be32 tip; /* IP Address of requested hw addr */ 69} __attribute__((packed)); 70 71/* This header format is specific to this driver implementation. */ 72#define FWNET_ALEN 8 73#define FWNET_HLEN 10 74struct fwnet_header { 75 u8 h_dest[FWNET_ALEN]; /* destination address */ 76 __be16 h_proto; /* packet type ID field */ 77} __attribute__((packed)); 78 79/* IPv4 and IPv6 encapsulation header */ 80struct rfc2734_header { 81 u32 w0; 82 u32 w1; 83}; 84 85#define fwnet_get_hdr_lf(h) (((h)->w0 & 0xc0000000) >> 30) 86#define fwnet_get_hdr_ether_type(h) (((h)->w0 & 0x0000ffff)) 87#define fwnet_get_hdr_dg_size(h) (((h)->w0 & 0x0fff0000) >> 16) 88#define fwnet_get_hdr_fg_off(h) (((h)->w0 & 0x00000fff)) 89#define fwnet_get_hdr_dgl(h) (((h)->w1 & 0xffff0000) >> 16) 90 91#define fwnet_set_hdr_lf(lf) ((lf) << 30) 92#define fwnet_set_hdr_ether_type(et) (et) 93#define fwnet_set_hdr_dg_size(dgs) ((dgs) << 16) 94#define fwnet_set_hdr_fg_off(fgo) (fgo) 95 96#define fwnet_set_hdr_dgl(dgl) ((dgl) << 16) 97 98static inline void fwnet_make_uf_hdr(struct rfc2734_header *hdr, 99 unsigned ether_type) 100{ 101 hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_UNFRAG) 102 | fwnet_set_hdr_ether_type(ether_type); 103} 104 105static inline void fwnet_make_ff_hdr(struct rfc2734_header *hdr, 106 unsigned ether_type, unsigned dg_size, unsigned dgl) 107{ 108 hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_FIRSTFRAG) 109 | fwnet_set_hdr_dg_size(dg_size) 110 | fwnet_set_hdr_ether_type(ether_type); 111 hdr->w1 = fwnet_set_hdr_dgl(dgl); 112} 113 114static inline void fwnet_make_sf_hdr(struct rfc2734_header *hdr, 115 unsigned lf, unsigned dg_size, unsigned fg_off, unsigned dgl) 116{ 117 hdr->w0 = fwnet_set_hdr_lf(lf) 118 | fwnet_set_hdr_dg_size(dg_size) 119 | fwnet_set_hdr_fg_off(fg_off); 120 hdr->w1 = fwnet_set_hdr_dgl(dgl); 121} 122 123/* This list keeps track of what parts of the datagram have been filled in */ 124struct fwnet_fragment_info { 125 struct list_head fi_link; 126 u16 offset; 127 u16 len; 128}; 129 130struct fwnet_partial_datagram { 131 struct list_head pd_link; 132 struct list_head fi_list; 133 struct sk_buff *skb; 134 char *pbuf; 135 u16 datagram_label; 136 u16 ether_type; 137 u16 datagram_size; 138}; 139 140static DEFINE_MUTEX(fwnet_device_mutex); 141static LIST_HEAD(fwnet_device_list); 142 143struct fwnet_device { 144 struct list_head dev_link; 145 spinlock_t lock; 146 enum { 147 FWNET_BROADCAST_ERROR, 148 FWNET_BROADCAST_RUNNING, 149 FWNET_BROADCAST_STOPPED, 150 } broadcast_state; 151 struct fw_iso_context *broadcast_rcv_context; 152 struct fw_iso_buffer broadcast_rcv_buffer; 153 void **broadcast_rcv_buffer_ptrs; 154 unsigned broadcast_rcv_next_ptr; 155 unsigned num_broadcast_rcv_ptrs; 156 unsigned rcv_buffer_size; 157 /* 158 * This value is the maximum unfragmented datagram size that can be 159 * sent by the hardware. It already has the GASP overhead and the 160 * unfragmented datagram header overhead calculated into it. 161 */ 162 unsigned broadcast_xmt_max_payload; 163 u16 broadcast_xmt_datagramlabel; 164 165 /* 166 * The CSR address that remote nodes must send datagrams to for us to 167 * receive them. 168 */ 169 struct fw_address_handler handler; 170 u64 local_fifo; 171 172 /* List of packets to be sent */ 173 struct list_head packet_list; 174 /* 175 * List of packets that were broadcasted. When we get an ISO interrupt 176 * one of them has been sent 177 */ 178 struct list_head broadcasted_list; 179 /* List of packets that have been sent but not yet acked */ 180 struct list_head sent_list; 181 182 struct list_head peer_list; 183 struct fw_card *card; 184 struct net_device *netdev; 185}; 186 187struct fwnet_peer { 188 struct list_head peer_link; 189 struct fwnet_device *dev; 190 u64 guid; 191 u64 fifo; 192 193 /* guarded by dev->lock */ 194 struct list_head pd_list; /* received partial datagrams */ 195 unsigned pdg_size; /* pd_list size */ 196 197 u16 datagram_label; /* outgoing datagram label */ 198 unsigned max_payload; /* includes RFC2374_FRAG_HDR_SIZE overhead */ 199 int node_id; 200 int generation; 201 unsigned speed; 202}; 203 204/* This is our task struct. It's used for the packet complete callback. */ 205struct fwnet_packet_task { 206 /* 207 * ptask can actually be on dev->packet_list, dev->broadcasted_list, 208 * or dev->sent_list depending on its current state. 209 */ 210 struct list_head pt_link; 211 struct fw_transaction transaction; 212 struct rfc2734_header hdr; 213 struct sk_buff *skb; 214 struct fwnet_device *dev; 215 216 int outstanding_pkts; 217 unsigned max_payload; 218 u64 fifo_addr; 219 u16 dest_node; 220 u8 generation; 221 u8 speed; 222}; 223 224/* 225 * saddr == NULL means use device source address. 226 * daddr == NULL means leave destination address (eg unresolved arp). 227 */ 228static int fwnet_header_create(struct sk_buff *skb, struct net_device *net, 229 unsigned short type, const void *daddr, 230 const void *saddr, unsigned len) 231{ 232 struct fwnet_header *h; 233 234 h = (struct fwnet_header *)skb_push(skb, sizeof(*h)); 235 put_unaligned_be16(type, &h->h_proto); 236 237 if (net->flags & (IFF_LOOPBACK | IFF_NOARP)) { 238 memset(h->h_dest, 0, net->addr_len); 239 240 return net->hard_header_len; 241 } 242 243 if (daddr) { 244 memcpy(h->h_dest, daddr, net->addr_len); 245 246 return net->hard_header_len; 247 } 248 249 return -net->hard_header_len; 250} 251 252static int fwnet_header_rebuild(struct sk_buff *skb) 253{ 254 struct fwnet_header *h = (struct fwnet_header *)skb->data; 255 256 if (get_unaligned_be16(&h->h_proto) == ETH_P_IP) 257 return arp_find((unsigned char *)&h->h_dest, skb); 258 259 fw_notify("%s: unable to resolve type %04x addresses\n", 260 skb->dev->name, be16_to_cpu(h->h_proto)); 261 return 0; 262} 263 264static int fwnet_header_cache(const struct neighbour *neigh, 265 struct hh_cache *hh) 266{ 267 struct net_device *net; 268 struct fwnet_header *h; 269 270 if (hh->hh_type == cpu_to_be16(ETH_P_802_3)) 271 return -1; 272 net = neigh->dev; 273 h = (struct fwnet_header *)((u8 *)hh->hh_data + 16 - sizeof(*h)); 274 h->h_proto = hh->hh_type; 275 memcpy(h->h_dest, neigh->ha, net->addr_len); 276 hh->hh_len = FWNET_HLEN; 277 278 return 0; 279} 280 281/* Called by Address Resolution module to notify changes in address. */ 282static void fwnet_header_cache_update(struct hh_cache *hh, 283 const struct net_device *net, const unsigned char *haddr) 284{ 285 memcpy((u8 *)hh->hh_data + 16 - FWNET_HLEN, haddr, net->addr_len); 286} 287 288static int fwnet_header_parse(const struct sk_buff *skb, unsigned char *haddr) 289{ 290 memcpy(haddr, skb->dev->dev_addr, FWNET_ALEN); 291 292 return FWNET_ALEN; 293} 294 295static const struct header_ops fwnet_header_ops = { 296 .create = fwnet_header_create, 297 .rebuild = fwnet_header_rebuild, 298 .cache = fwnet_header_cache, 299 .cache_update = fwnet_header_cache_update, 300 .parse = fwnet_header_parse, 301}; 302 303static bool fwnet_frag_overlap(struct fwnet_partial_datagram *pd, 304 unsigned offset, unsigned len) 305{ 306 struct fwnet_fragment_info *fi; 307 unsigned end = offset + len; 308 309 list_for_each_entry(fi, &pd->fi_list, fi_link) 310 if (offset < fi->offset + fi->len && end > fi->offset) 311 return true; 312 313 return false; 314} 315 316/* Assumes that new fragment does not overlap any existing fragments */ 317static struct fwnet_fragment_info *fwnet_frag_new( 318 struct fwnet_partial_datagram *pd, unsigned offset, unsigned len) 319{ 320 struct fwnet_fragment_info *fi, *fi2, *new; 321 struct list_head *list; 322 323 list = &pd->fi_list; 324 list_for_each_entry(fi, &pd->fi_list, fi_link) { 325 if (fi->offset + fi->len == offset) { 326 /* The new fragment can be tacked on to the end */ 327 /* Did the new fragment plug a hole? */ 328 fi2 = list_entry(fi->fi_link.next, 329 struct fwnet_fragment_info, fi_link); 330 if (fi->offset + fi->len == fi2->offset) { 331 /* glue fragments together */ 332 fi->len += len + fi2->len; 333 list_del(&fi2->fi_link); 334 kfree(fi2); 335 } else { 336 fi->len += len; 337 } 338 339 return fi; 340 } 341 if (offset + len == fi->offset) { 342 /* The new fragment can be tacked on to the beginning */ 343 /* Did the new fragment plug a hole? */ 344 fi2 = list_entry(fi->fi_link.prev, 345 struct fwnet_fragment_info, fi_link); 346 if (fi2->offset + fi2->len == fi->offset) { 347 /* glue fragments together */ 348 fi2->len += fi->len + len; 349 list_del(&fi->fi_link); 350 kfree(fi); 351 352 return fi2; 353 } 354 fi->offset = offset; 355 fi->len += len; 356 357 return fi; 358 } 359 if (offset > fi->offset + fi->len) { 360 list = &fi->fi_link; 361 break; 362 } 363 if (offset + len < fi->offset) { 364 list = fi->fi_link.prev; 365 break; 366 } 367 } 368 369 new = kmalloc(sizeof(*new), GFP_ATOMIC); 370 if (!new) { 371 fw_error("out of memory\n"); 372 return NULL; 373 } 374 375 new->offset = offset; 376 new->len = len; 377 list_add(&new->fi_link, list); 378 379 return new; 380} 381 382static struct fwnet_partial_datagram *fwnet_pd_new(struct net_device *net, 383 struct fwnet_peer *peer, u16 datagram_label, unsigned dg_size, 384 void *frag_buf, unsigned frag_off, unsigned frag_len) 385{ 386 struct fwnet_partial_datagram *new; 387 struct fwnet_fragment_info *fi; 388 389 new = kmalloc(sizeof(*new), GFP_ATOMIC); 390 if (!new) 391 goto fail; 392 393 INIT_LIST_HEAD(&new->fi_list); 394 fi = fwnet_frag_new(new, frag_off, frag_len); 395 if (fi == NULL) 396 goto fail_w_new; 397 398 new->datagram_label = datagram_label; 399 new->datagram_size = dg_size; 400 new->skb = dev_alloc_skb(dg_size + net->hard_header_len + 15); 401 if (new->skb == NULL) 402 goto fail_w_fi; 403 404 skb_reserve(new->skb, (net->hard_header_len + 15) & ~15); 405 new->pbuf = skb_put(new->skb, dg_size); 406 memcpy(new->pbuf + frag_off, frag_buf, frag_len); 407 list_add_tail(&new->pd_link, &peer->pd_list); 408 409 return new; 410 411fail_w_fi: 412 kfree(fi); 413fail_w_new: 414 kfree(new); 415fail: 416 fw_error("out of memory\n"); 417 418 return NULL; 419} 420 421static struct fwnet_partial_datagram *fwnet_pd_find(struct fwnet_peer *peer, 422 u16 datagram_label) 423{ 424 struct fwnet_partial_datagram *pd; 425 426 list_for_each_entry(pd, &peer->pd_list, pd_link) 427 if (pd->datagram_label == datagram_label) 428 return pd; 429 430 return NULL; 431} 432 433 434static void fwnet_pd_delete(struct fwnet_partial_datagram *old) 435{ 436 struct fwnet_fragment_info *fi, *n; 437 438 list_for_each_entry_safe(fi, n, &old->fi_list, fi_link) 439 kfree(fi); 440 441 list_del(&old->pd_link); 442 dev_kfree_skb_any(old->skb); 443 kfree(old); 444} 445 446static bool fwnet_pd_update(struct fwnet_peer *peer, 447 struct fwnet_partial_datagram *pd, void *frag_buf, 448 unsigned frag_off, unsigned frag_len) 449{ 450 if (fwnet_frag_new(pd, frag_off, frag_len) == NULL) 451 return false; 452 453 memcpy(pd->pbuf + frag_off, frag_buf, frag_len); 454 455 /* 456 * Move list entry to beginnig of list so that oldest partial 457 * datagrams percolate to the end of the list 458 */ 459 list_move_tail(&pd->pd_link, &peer->pd_list); 460 461 return true; 462} 463 464static bool fwnet_pd_is_complete(struct fwnet_partial_datagram *pd) 465{ 466 struct fwnet_fragment_info *fi; 467 468 fi = list_entry(pd->fi_list.next, struct fwnet_fragment_info, fi_link); 469 470 return fi->len == pd->datagram_size; 471} 472 473/* caller must hold dev->lock */ 474static struct fwnet_peer *fwnet_peer_find_by_guid(struct fwnet_device *dev, 475 u64 guid) 476{ 477 struct fwnet_peer *peer; 478 479 list_for_each_entry(peer, &dev->peer_list, peer_link) 480 if (peer->guid == guid) 481 return peer; 482 483 return NULL; 484} 485 486/* caller must hold dev->lock */ 487static struct fwnet_peer *fwnet_peer_find_by_node_id(struct fwnet_device *dev, 488 int node_id, int generation) 489{ 490 struct fwnet_peer *peer; 491 492 list_for_each_entry(peer, &dev->peer_list, peer_link) 493 if (peer->node_id == node_id && 494 peer->generation == generation) 495 return peer; 496 497 return NULL; 498} 499 500/* See IEEE 1394-2008 table 6-4, table 8-8, table 16-18. */ 501static unsigned fwnet_max_payload(unsigned max_rec, unsigned speed) 502{ 503 max_rec = min(max_rec, speed + 8); 504 max_rec = min(max_rec, 0xbU); /* <= 4096 */ 505 if (max_rec < 8) { 506 fw_notify("max_rec %x out of range\n", max_rec); 507 max_rec = 8; 508 } 509 510 return (1 << (max_rec + 1)) - RFC2374_FRAG_HDR_SIZE; 511} 512 513 514static int fwnet_finish_incoming_packet(struct net_device *net, 515 struct sk_buff *skb, u16 source_node_id, 516 bool is_broadcast, u16 ether_type) 517{ 518 struct fwnet_device *dev; 519 static const __be64 broadcast_hw = cpu_to_be64(~0ULL); 520 int status; 521 __be64 guid; 522 523 dev = netdev_priv(net); 524 /* Write metadata, and then pass to the receive level */ 525 skb->dev = net; 526 skb->ip_summed = CHECKSUM_UNNECESSARY; /* don't check it */ 527 528 /* 529 * Parse the encapsulation header. This actually does the job of 530 * converting to an ethernet frame header, as well as arp 531 * conversion if needed. ARP conversion is easier in this 532 * direction, since we are using ethernet as our backend. 533 */ 534 /* 535 * If this is an ARP packet, convert it. First, we want to make 536 * use of some of the fields, since they tell us a little bit 537 * about the sending machine. 538 */ 539 if (ether_type == ETH_P_ARP) { 540 struct rfc2734_arp *arp1394; 541 struct arphdr *arp; 542 unsigned char *arp_ptr; 543 u64 fifo_addr; 544 u64 peer_guid; 545 unsigned sspd; 546 u16 max_payload; 547 struct fwnet_peer *peer; 548 unsigned long flags; 549 550 arp1394 = (struct rfc2734_arp *)skb->data; 551 arp = (struct arphdr *)skb->data; 552 arp_ptr = (unsigned char *)(arp + 1); 553 peer_guid = get_unaligned_be64(&arp1394->s_uniq_id); 554 fifo_addr = (u64)get_unaligned_be16(&arp1394->fifo_hi) << 32 555 | get_unaligned_be32(&arp1394->fifo_lo); 556 557 sspd = arp1394->sspd; 558 /* Sanity check. OS X 10.3 PPC reportedly sends 131. */ 559 if (sspd > SCODE_3200) { 560 fw_notify("sspd %x out of range\n", sspd); 561 sspd = SCODE_3200; 562 } 563 max_payload = fwnet_max_payload(arp1394->max_rec, sspd); 564 565 spin_lock_irqsave(&dev->lock, flags); 566 peer = fwnet_peer_find_by_guid(dev, peer_guid); 567 if (peer) { 568 peer->fifo = fifo_addr; 569 570 if (peer->speed > sspd) 571 peer->speed = sspd; 572 if (peer->max_payload > max_payload) 573 peer->max_payload = max_payload; 574 } 575 spin_unlock_irqrestore(&dev->lock, flags); 576 577 if (!peer) { 578 fw_notify("No peer for ARP packet from %016llx\n", 579 (unsigned long long)peer_guid); 580 goto no_peer; 581 } 582 583 /* 584 * Now that we're done with the 1394 specific stuff, we'll 585 * need to alter some of the data. Believe it or not, all 586 * that needs to be done is sender_IP_address needs to be 587 * moved, the destination hardware address get stuffed 588 * in and the hardware address length set to 8. 589 * 590 * IMPORTANT: The code below overwrites 1394 specific data 591 * needed above so keep the munging of the data for the 592 * higher level IP stack last. 593 */ 594 595 arp->ar_hln = 8; 596 /* skip over sender unique id */ 597 arp_ptr += arp->ar_hln; 598 /* move sender IP addr */ 599 put_unaligned(arp1394->sip, (u32 *)arp_ptr); 600 /* skip over sender IP addr */ 601 arp_ptr += arp->ar_pln; 602 603 if (arp->ar_op == htons(ARPOP_REQUEST)) 604 memset(arp_ptr, 0, sizeof(u64)); 605 else 606 memcpy(arp_ptr, net->dev_addr, sizeof(u64)); 607 } 608 609 /* Now add the ethernet header. */ 610 guid = cpu_to_be64(dev->card->guid); 611 if (dev_hard_header(skb, net, ether_type, 612 is_broadcast ? &broadcast_hw : &guid, 613 NULL, skb->len) >= 0) { 614 struct fwnet_header *eth; 615 u16 *rawp; 616 __be16 protocol; 617 618 skb_reset_mac_header(skb); 619 skb_pull(skb, sizeof(*eth)); 620 eth = (struct fwnet_header *)skb_mac_header(skb); 621 if (*eth->h_dest & 1) { 622 if (memcmp(eth->h_dest, net->broadcast, 623 net->addr_len) == 0) 624 skb->pkt_type = PACKET_BROADCAST; 625 } else { 626 if (memcmp(eth->h_dest, net->dev_addr, net->addr_len)) 627 skb->pkt_type = PACKET_OTHERHOST; 628 } 629 if (ntohs(eth->h_proto) >= 1536) { 630 protocol = eth->h_proto; 631 } else { 632 rawp = (u16 *)skb->data; 633 if (*rawp == 0xffff) 634 protocol = htons(ETH_P_802_3); 635 else 636 protocol = htons(ETH_P_802_2); 637 } 638 skb->protocol = protocol; 639 } 640 status = netif_rx(skb); 641 if (status == NET_RX_DROP) { 642 net->stats.rx_errors++; 643 net->stats.rx_dropped++; 644 } else { 645 net->stats.rx_packets++; 646 net->stats.rx_bytes += skb->len; 647 } 648 if (netif_queue_stopped(net)) 649 netif_wake_queue(net); 650 651 return 0; 652 653 no_peer: 654 net->stats.rx_errors++; 655 net->stats.rx_dropped++; 656 657 dev_kfree_skb_any(skb); 658 if (netif_queue_stopped(net)) 659 netif_wake_queue(net); 660 661 return -ENOENT; 662} 663 664static int fwnet_incoming_packet(struct fwnet_device *dev, __be32 *buf, int len, 665 int source_node_id, int generation, 666 bool is_broadcast) 667{ 668 struct sk_buff *skb; 669 struct net_device *net = dev->netdev; 670 struct rfc2734_header hdr; 671 unsigned lf; 672 unsigned long flags; 673 struct fwnet_peer *peer; 674 struct fwnet_partial_datagram *pd; 675 int fg_off; 676 int dg_size; 677 u16 datagram_label; 678 int retval; 679 u16 ether_type; 680 681 hdr.w0 = be32_to_cpu(buf[0]); 682 lf = fwnet_get_hdr_lf(&hdr); 683 if (lf == RFC2374_HDR_UNFRAG) { 684 /* 685 * An unfragmented datagram has been received by the ieee1394 686 * bus. Build an skbuff around it so we can pass it to the 687 * high level network layer. 688 */ 689 ether_type = fwnet_get_hdr_ether_type(&hdr); 690 buf++; 691 len -= RFC2374_UNFRAG_HDR_SIZE; 692 693 skb = dev_alloc_skb(len + net->hard_header_len + 15); 694 if (unlikely(!skb)) { 695 fw_error("out of memory\n"); 696 net->stats.rx_dropped++; 697 698 return -ENOMEM; 699 } 700 skb_reserve(skb, (net->hard_header_len + 15) & ~15); 701 memcpy(skb_put(skb, len), buf, len); 702 703 return fwnet_finish_incoming_packet(net, skb, source_node_id, 704 is_broadcast, ether_type); 705 } 706 /* A datagram fragment has been received, now the fun begins. */ 707 hdr.w1 = ntohl(buf[1]); 708 buf += 2; 709 len -= RFC2374_FRAG_HDR_SIZE; 710 if (lf == RFC2374_HDR_FIRSTFRAG) { 711 ether_type = fwnet_get_hdr_ether_type(&hdr); 712 fg_off = 0; 713 } else { 714 ether_type = 0; 715 fg_off = fwnet_get_hdr_fg_off(&hdr); 716 } 717 datagram_label = fwnet_get_hdr_dgl(&hdr); 718 dg_size = fwnet_get_hdr_dg_size(&hdr); /* ??? + 1 */ 719 720 spin_lock_irqsave(&dev->lock, flags); 721 722 peer = fwnet_peer_find_by_node_id(dev, source_node_id, generation); 723 if (!peer) { 724 retval = -ENOENT; 725 goto fail; 726 } 727 728 pd = fwnet_pd_find(peer, datagram_label); 729 if (pd == NULL) { 730 while (peer->pdg_size >= FWNET_MAX_FRAGMENTS) { 731 /* remove the oldest */ 732 fwnet_pd_delete(list_first_entry(&peer->pd_list, 733 struct fwnet_partial_datagram, pd_link)); 734 peer->pdg_size--; 735 } 736 pd = fwnet_pd_new(net, peer, datagram_label, 737 dg_size, buf, fg_off, len); 738 if (pd == NULL) { 739 retval = -ENOMEM; 740 goto fail; 741 } 742 peer->pdg_size++; 743 } else { 744 if (fwnet_frag_overlap(pd, fg_off, len) || 745 pd->datagram_size != dg_size) { 746 /* 747 * Differing datagram sizes or overlapping fragments, 748 * discard old datagram and start a new one. 749 */ 750 fwnet_pd_delete(pd); 751 pd = fwnet_pd_new(net, peer, datagram_label, 752 dg_size, buf, fg_off, len); 753 if (pd == NULL) { 754 peer->pdg_size--; 755 retval = -ENOMEM; 756 goto fail; 757 } 758 } else { 759 if (!fwnet_pd_update(peer, pd, buf, fg_off, len)) { 760 /* 761 * Couldn't save off fragment anyway 762 * so might as well obliterate the 763 * datagram now. 764 */ 765 fwnet_pd_delete(pd); 766 peer->pdg_size--; 767 retval = -ENOMEM; 768 goto fail; 769 } 770 } 771 } /* new datagram or add to existing one */ 772 773 if (lf == RFC2374_HDR_FIRSTFRAG) 774 pd->ether_type = ether_type; 775 776 if (fwnet_pd_is_complete(pd)) { 777 ether_type = pd->ether_type; 778 peer->pdg_size--; 779 skb = skb_get(pd->skb); 780 fwnet_pd_delete(pd); 781 782 spin_unlock_irqrestore(&dev->lock, flags); 783 784 return fwnet_finish_incoming_packet(net, skb, source_node_id, 785 false, ether_type); 786 } 787 /* 788 * Datagram is not complete, we're done for the 789 * moment. 790 */ 791 spin_unlock_irqrestore(&dev->lock, flags); 792 793 return 0; 794 fail: 795 spin_unlock_irqrestore(&dev->lock, flags); 796 797 if (netif_queue_stopped(net)) 798 netif_wake_queue(net); 799 800 return retval; 801} 802 803static void fwnet_receive_packet(struct fw_card *card, struct fw_request *r, 804 int tcode, int destination, int source, int generation, 805 unsigned long long offset, void *payload, size_t length, 806 void *callback_data) 807{ 808 struct fwnet_device *dev = callback_data; 809 int rcode; 810 811 if (destination == IEEE1394_ALL_NODES) { 812 kfree(r); 813 814 return; 815 } 816 817 if (offset != dev->handler.offset) 818 rcode = RCODE_ADDRESS_ERROR; 819 else if (tcode != TCODE_WRITE_BLOCK_REQUEST) 820 rcode = RCODE_TYPE_ERROR; 821 else if (fwnet_incoming_packet(dev, payload, length, 822 source, generation, false) != 0) { 823 fw_error("Incoming packet failure\n"); 824 rcode = RCODE_CONFLICT_ERROR; 825 } else 826 rcode = RCODE_COMPLETE; 827 828 fw_send_response(card, r, rcode); 829} 830 831static void fwnet_receive_broadcast(struct fw_iso_context *context, 832 u32 cycle, size_t header_length, void *header, void *data) 833{ 834 struct fwnet_device *dev; 835 struct fw_iso_packet packet; 836 struct fw_card *card; 837 __be16 *hdr_ptr; 838 __be32 *buf_ptr; 839 int retval; 840 u32 length; 841 u16 source_node_id; 842 u32 specifier_id; 843 u32 ver; 844 unsigned long offset; 845 unsigned long flags; 846 847 dev = data; 848 card = dev->card; 849 hdr_ptr = header; 850 length = be16_to_cpup(hdr_ptr); 851 852 spin_lock_irqsave(&dev->lock, flags); 853 854 offset = dev->rcv_buffer_size * dev->broadcast_rcv_next_ptr; 855 buf_ptr = dev->broadcast_rcv_buffer_ptrs[dev->broadcast_rcv_next_ptr++]; 856 if (dev->broadcast_rcv_next_ptr == dev->num_broadcast_rcv_ptrs) 857 dev->broadcast_rcv_next_ptr = 0; 858 859 spin_unlock_irqrestore(&dev->lock, flags); 860 861 specifier_id = (be32_to_cpu(buf_ptr[0]) & 0xffff) << 8 862 | (be32_to_cpu(buf_ptr[1]) & 0xff000000) >> 24; 863 ver = be32_to_cpu(buf_ptr[1]) & 0xffffff; 864 source_node_id = be32_to_cpu(buf_ptr[0]) >> 16; 865 866 if (specifier_id == IANA_SPECIFIER_ID && ver == RFC2734_SW_VERSION) { 867 buf_ptr += 2; 868 length -= IEEE1394_GASP_HDR_SIZE; 869 fwnet_incoming_packet(dev, buf_ptr, length, 870 source_node_id, -1, true); 871 } 872 873 packet.payload_length = dev->rcv_buffer_size; 874 packet.interrupt = 1; 875 packet.skip = 0; 876 packet.tag = 3; 877 packet.sy = 0; 878 packet.header_length = IEEE1394_GASP_HDR_SIZE; 879 880 spin_lock_irqsave(&dev->lock, flags); 881 882 retval = fw_iso_context_queue(dev->broadcast_rcv_context, &packet, 883 &dev->broadcast_rcv_buffer, offset); 884 885 spin_unlock_irqrestore(&dev->lock, flags); 886 887 if (retval < 0) 888 fw_error("requeue failed\n"); 889} 890 891static struct kmem_cache *fwnet_packet_task_cache; 892 893static void fwnet_free_ptask(struct fwnet_packet_task *ptask) 894{ 895 dev_kfree_skb_any(ptask->skb); 896 kmem_cache_free(fwnet_packet_task_cache, ptask); 897} 898 899static int fwnet_send_packet(struct fwnet_packet_task *ptask); 900 901static void fwnet_transmit_packet_done(struct fwnet_packet_task *ptask) 902{ 903 struct fwnet_device *dev = ptask->dev; 904 unsigned long flags; 905 bool free; 906 907 spin_lock_irqsave(&dev->lock, flags); 908 909 ptask->outstanding_pkts--; 910 911 /* Check whether we or the networking TX soft-IRQ is last user. */ 912 free = (ptask->outstanding_pkts == 0 && !list_empty(&ptask->pt_link)); 913 914 if (ptask->outstanding_pkts == 0) 915 list_del(&ptask->pt_link); 916 917 spin_unlock_irqrestore(&dev->lock, flags); 918 919 if (ptask->outstanding_pkts > 0) { 920 u16 dg_size; 921 u16 fg_off; 922 u16 datagram_label; 923 u16 lf; 924 struct sk_buff *skb; 925 926 /* Update the ptask to point to the next fragment and send it */ 927 lf = fwnet_get_hdr_lf(&ptask->hdr); 928 switch (lf) { 929 case RFC2374_HDR_LASTFRAG: 930 case RFC2374_HDR_UNFRAG: 931 default: 932 fw_error("Outstanding packet %x lf %x, header %x,%x\n", 933 ptask->outstanding_pkts, lf, ptask->hdr.w0, 934 ptask->hdr.w1); 935 BUG(); 936 937 case RFC2374_HDR_FIRSTFRAG: 938 /* Set frag type here for future interior fragments */ 939 dg_size = fwnet_get_hdr_dg_size(&ptask->hdr); 940 fg_off = ptask->max_payload - RFC2374_FRAG_HDR_SIZE; 941 datagram_label = fwnet_get_hdr_dgl(&ptask->hdr); 942 break; 943 944 case RFC2374_HDR_INTFRAG: 945 dg_size = fwnet_get_hdr_dg_size(&ptask->hdr); 946 fg_off = fwnet_get_hdr_fg_off(&ptask->hdr) 947 + ptask->max_payload - RFC2374_FRAG_HDR_SIZE; 948 datagram_label = fwnet_get_hdr_dgl(&ptask->hdr); 949 break; 950 } 951 skb = ptask->skb; 952 skb_pull(skb, ptask->max_payload); 953 if (ptask->outstanding_pkts > 1) { 954 fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_INTFRAG, 955 dg_size, fg_off, datagram_label); 956 } else { 957 fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_LASTFRAG, 958 dg_size, fg_off, datagram_label); 959 ptask->max_payload = skb->len + RFC2374_FRAG_HDR_SIZE; 960 } 961 fwnet_send_packet(ptask); 962 } 963 964 if (free) 965 fwnet_free_ptask(ptask); 966} 967 968static void fwnet_write_complete(struct fw_card *card, int rcode, 969 void *payload, size_t length, void *data) 970{ 971 struct fwnet_packet_task *ptask; 972 973 ptask = data; 974 975 if (rcode == RCODE_COMPLETE) 976 fwnet_transmit_packet_done(ptask); 977 else 978 fw_error("fwnet_write_complete: failed: %x\n", rcode); 979 /* ??? error recovery */ 980} 981 982static int fwnet_send_packet(struct fwnet_packet_task *ptask) 983{ 984 struct fwnet_device *dev; 985 unsigned tx_len; 986 struct rfc2734_header *bufhdr; 987 unsigned long flags; 988 bool free; 989 990 dev = ptask->dev; 991 tx_len = ptask->max_payload; 992 switch (fwnet_get_hdr_lf(&ptask->hdr)) { 993 case RFC2374_HDR_UNFRAG: 994 bufhdr = (struct rfc2734_header *) 995 skb_push(ptask->skb, RFC2374_UNFRAG_HDR_SIZE); 996 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0); 997 break; 998 999 case RFC2374_HDR_FIRSTFRAG: 1000 case RFC2374_HDR_INTFRAG: 1001 case RFC2374_HDR_LASTFRAG: 1002 bufhdr = (struct rfc2734_header *) 1003 skb_push(ptask->skb, RFC2374_FRAG_HDR_SIZE); 1004 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0); 1005 put_unaligned_be32(ptask->hdr.w1, &bufhdr->w1); 1006 break; 1007 1008 default: 1009 BUG(); 1010 } 1011 if (ptask->dest_node == IEEE1394_ALL_NODES) { 1012 u8 *p; 1013 int generation; 1014 int node_id; 1015 1016 /* ptask->generation may not have been set yet */ 1017 generation = dev->card->generation; 1018 smp_rmb(); 1019 node_id = dev->card->node_id; 1020 1021 p = skb_push(ptask->skb, 8); 1022 put_unaligned_be32(node_id << 16 | IANA_SPECIFIER_ID >> 8, p); 1023 put_unaligned_be32((IANA_SPECIFIER_ID & 0xff) << 24 1024 | RFC2734_SW_VERSION, &p[4]); 1025 1026 /* We should not transmit if broadcast_channel.valid == 0. */ 1027 fw_send_request(dev->card, &ptask->transaction, 1028 TCODE_STREAM_DATA, 1029 fw_stream_packet_destination_id(3, 1030 IEEE1394_BROADCAST_CHANNEL, 0), 1031 generation, SCODE_100, 0ULL, ptask->skb->data, 1032 tx_len + 8, fwnet_write_complete, ptask); 1033 1034 spin_lock_irqsave(&dev->lock, flags); 1035 1036 /* If the AT tasklet already ran, we may be last user. */ 1037 free = (ptask->outstanding_pkts == 0 && list_empty(&ptask->pt_link)); 1038 if (!free) 1039 list_add_tail(&ptask->pt_link, &dev->broadcasted_list); 1040 1041 spin_unlock_irqrestore(&dev->lock, flags); 1042 1043 goto out; 1044 } 1045 1046 fw_send_request(dev->card, &ptask->transaction, 1047 TCODE_WRITE_BLOCK_REQUEST, ptask->dest_node, 1048 ptask->generation, ptask->speed, ptask->fifo_addr, 1049 ptask->skb->data, tx_len, fwnet_write_complete, ptask); 1050 1051 spin_lock_irqsave(&dev->lock, flags); 1052 1053 /* If the AT tasklet already ran, we may be last user. */ 1054 free = (ptask->outstanding_pkts == 0 && list_empty(&ptask->pt_link)); 1055 if (!free) 1056 list_add_tail(&ptask->pt_link, &dev->sent_list); 1057 1058 spin_unlock_irqrestore(&dev->lock, flags); 1059 1060 dev->netdev->trans_start = jiffies; 1061 out: 1062 if (free) 1063 fwnet_free_ptask(ptask); 1064 1065 return 0; 1066} 1067 1068static int fwnet_broadcast_start(struct fwnet_device *dev) 1069{ 1070 struct fw_iso_context *context; 1071 int retval; 1072 unsigned num_packets; 1073 unsigned max_receive; 1074 struct fw_iso_packet packet; 1075 unsigned long offset; 1076 unsigned u; 1077 1078 if (dev->local_fifo == FWNET_NO_FIFO_ADDR) { 1079 /* outside OHCI posted write area? */ 1080 static const struct fw_address_region region = { 1081 .start = 0xffff00000000ULL, 1082 .end = CSR_REGISTER_BASE, 1083 }; 1084 1085 dev->handler.length = 4096; 1086 dev->handler.address_callback = fwnet_receive_packet; 1087 dev->handler.callback_data = dev; 1088 1089 retval = fw_core_add_address_handler(&dev->handler, ®ion); 1090 if (retval < 0) 1091 goto failed_initial; 1092 1093 dev->local_fifo = dev->handler.offset; 1094 } 1095 1096 max_receive = 1U << (dev->card->max_receive + 1); 1097 num_packets = (FWNET_ISO_PAGE_COUNT * PAGE_SIZE) / max_receive; 1098 1099 if (!dev->broadcast_rcv_context) { 1100 void **ptrptr; 1101 1102 context = fw_iso_context_create(dev->card, 1103 FW_ISO_CONTEXT_RECEIVE, IEEE1394_BROADCAST_CHANNEL, 1104 dev->card->link_speed, 8, fwnet_receive_broadcast, dev); 1105 if (IS_ERR(context)) { 1106 retval = PTR_ERR(context); 1107 goto failed_context_create; 1108 } 1109 1110 retval = fw_iso_buffer_init(&dev->broadcast_rcv_buffer, 1111 dev->card, FWNET_ISO_PAGE_COUNT, DMA_FROM_DEVICE); 1112 if (retval < 0) 1113 goto failed_buffer_init; 1114 1115 ptrptr = kmalloc(sizeof(void *) * num_packets, GFP_KERNEL); 1116 if (!ptrptr) { 1117 retval = -ENOMEM; 1118 goto failed_ptrs_alloc; 1119 } 1120 1121 dev->broadcast_rcv_buffer_ptrs = ptrptr; 1122 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++) { 1123 void *ptr; 1124 unsigned v; 1125 1126 ptr = kmap(dev->broadcast_rcv_buffer.pages[u]); 1127 for (v = 0; v < num_packets / FWNET_ISO_PAGE_COUNT; v++) 1128 *ptrptr++ = (void *) 1129 ((char *)ptr + v * max_receive); 1130 } 1131 dev->broadcast_rcv_context = context; 1132 } else { 1133 context = dev->broadcast_rcv_context; 1134 } 1135 1136 packet.payload_length = max_receive; 1137 packet.interrupt = 1; 1138 packet.skip = 0; 1139 packet.tag = 3; 1140 packet.sy = 0; 1141 packet.header_length = IEEE1394_GASP_HDR_SIZE; 1142 offset = 0; 1143 1144 for (u = 0; u < num_packets; u++) { 1145 retval = fw_iso_context_queue(context, &packet, 1146 &dev->broadcast_rcv_buffer, offset); 1147 if (retval < 0) 1148 goto failed_rcv_queue; 1149 1150 offset += max_receive; 1151 } 1152 dev->num_broadcast_rcv_ptrs = num_packets; 1153 dev->rcv_buffer_size = max_receive; 1154 dev->broadcast_rcv_next_ptr = 0U; 1155 retval = fw_iso_context_start(context, -1, 0, 1156 FW_ISO_CONTEXT_MATCH_ALL_TAGS); /* ??? sync */ 1157 if (retval < 0) 1158 goto failed_rcv_queue; 1159 1160 dev->broadcast_xmt_max_payload = IEEE1394_MAX_PAYLOAD_S100 1161 - IEEE1394_GASP_HDR_SIZE - RFC2374_UNFRAG_HDR_SIZE; 1162 dev->broadcast_state = FWNET_BROADCAST_RUNNING; 1163 1164 return 0; 1165 1166 failed_rcv_queue: 1167 kfree(dev->broadcast_rcv_buffer_ptrs); 1168 dev->broadcast_rcv_buffer_ptrs = NULL; 1169 failed_ptrs_alloc: 1170 fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer, dev->card); 1171 failed_buffer_init: 1172 fw_iso_context_destroy(context); 1173 dev->broadcast_rcv_context = NULL; 1174 failed_context_create: 1175 fw_core_remove_address_handler(&dev->handler); 1176 failed_initial: 1177 dev->local_fifo = FWNET_NO_FIFO_ADDR; 1178 1179 return retval; 1180} 1181 1182/* ifup */ 1183static int fwnet_open(struct net_device *net) 1184{ 1185 struct fwnet_device *dev = netdev_priv(net); 1186 int ret; 1187 1188 if (dev->broadcast_state == FWNET_BROADCAST_ERROR) { 1189 ret = fwnet_broadcast_start(dev); 1190 if (ret) 1191 return ret; 1192 } 1193 netif_start_queue(net); 1194 1195 return 0; 1196} 1197 1198/* ifdown */ 1199static int fwnet_stop(struct net_device *net) 1200{ 1201 netif_stop_queue(net); 1202 1203 /* Deallocate iso context for use by other applications? */ 1204 1205 return 0; 1206} 1207 1208static netdev_tx_t fwnet_tx(struct sk_buff *skb, struct net_device *net) 1209{ 1210 struct fwnet_header hdr_buf; 1211 struct fwnet_device *dev = netdev_priv(net); 1212 __be16 proto; 1213 u16 dest_node; 1214 unsigned max_payload; 1215 u16 dg_size; 1216 u16 *datagram_label_ptr; 1217 struct fwnet_packet_task *ptask; 1218 struct fwnet_peer *peer; 1219 unsigned long flags; 1220 1221 ptask = kmem_cache_alloc(fwnet_packet_task_cache, GFP_ATOMIC); 1222 if (ptask == NULL) 1223 goto fail; 1224 1225 skb = skb_share_check(skb, GFP_ATOMIC); 1226 if (!skb) 1227 goto fail; 1228 1229 /* 1230 * Make a copy of the driver-specific header. 1231 * We might need to rebuild the header on tx failure. 1232 */ 1233 memcpy(&hdr_buf, skb->data, sizeof(hdr_buf)); 1234 skb_pull(skb, sizeof(hdr_buf)); 1235 1236 proto = hdr_buf.h_proto; 1237 dg_size = skb->len; 1238 1239 /* serialize access to peer, including peer->datagram_label */ 1240 spin_lock_irqsave(&dev->lock, flags); 1241 1242 /* 1243 * Set the transmission type for the packet. ARP packets and IP 1244 * broadcast packets are sent via GASP. 1245 */ 1246 if (memcmp(hdr_buf.h_dest, net->broadcast, FWNET_ALEN) == 0 1247 || proto == htons(ETH_P_ARP) 1248 || (proto == htons(ETH_P_IP) 1249 && IN_MULTICAST(ntohl(ip_hdr(skb)->daddr)))) { 1250 max_payload = dev->broadcast_xmt_max_payload; 1251 datagram_label_ptr = &dev->broadcast_xmt_datagramlabel; 1252 1253 ptask->fifo_addr = FWNET_NO_FIFO_ADDR; 1254 ptask->generation = 0; 1255 ptask->dest_node = IEEE1394_ALL_NODES; 1256 ptask->speed = SCODE_100; 1257 } else { 1258 __be64 guid = get_unaligned((__be64 *)hdr_buf.h_dest); 1259 u8 generation; 1260 1261 peer = fwnet_peer_find_by_guid(dev, be64_to_cpu(guid)); 1262 if (!peer || peer->fifo == FWNET_NO_FIFO_ADDR) 1263 goto fail_unlock; 1264 1265 generation = peer->generation; 1266 dest_node = peer->node_id; 1267 max_payload = peer->max_payload; 1268 datagram_label_ptr = &peer->datagram_label; 1269 1270 ptask->fifo_addr = peer->fifo; 1271 ptask->generation = generation; 1272 ptask->dest_node = dest_node; 1273 ptask->speed = peer->speed; 1274 } 1275 1276 /* If this is an ARP packet, convert it */ 1277 if (proto == htons(ETH_P_ARP)) { 1278 struct arphdr *arp = (struct arphdr *)skb->data; 1279 unsigned char *arp_ptr = (unsigned char *)(arp + 1); 1280 struct rfc2734_arp *arp1394 = (struct rfc2734_arp *)skb->data; 1281 __be32 ipaddr; 1282 1283 ipaddr = get_unaligned((__be32 *)(arp_ptr + FWNET_ALEN)); 1284 1285 arp1394->hw_addr_len = RFC2734_HW_ADDR_LEN; 1286 arp1394->max_rec = dev->card->max_receive; 1287 arp1394->sspd = dev->card->link_speed; 1288 1289 put_unaligned_be16(dev->local_fifo >> 32, 1290 &arp1394->fifo_hi); 1291 put_unaligned_be32(dev->local_fifo & 0xffffffff, 1292 &arp1394->fifo_lo); 1293 put_unaligned(ipaddr, &arp1394->sip); 1294 } 1295 1296 ptask->hdr.w0 = 0; 1297 ptask->hdr.w1 = 0; 1298 ptask->skb = skb; 1299 ptask->dev = dev; 1300 1301 /* Does it all fit in one packet? */ 1302 if (dg_size <= max_payload) { 1303 fwnet_make_uf_hdr(&ptask->hdr, ntohs(proto)); 1304 ptask->outstanding_pkts = 1; 1305 max_payload = dg_size + RFC2374_UNFRAG_HDR_SIZE; 1306 } else { 1307 u16 datagram_label; 1308 1309 max_payload -= RFC2374_FRAG_OVERHEAD; 1310 datagram_label = (*datagram_label_ptr)++; 1311 fwnet_make_ff_hdr(&ptask->hdr, ntohs(proto), dg_size, 1312 datagram_label); 1313 ptask->outstanding_pkts = DIV_ROUND_UP(dg_size, max_payload); 1314 max_payload += RFC2374_FRAG_HDR_SIZE; 1315 } 1316 1317 spin_unlock_irqrestore(&dev->lock, flags); 1318 1319 ptask->max_payload = max_payload; 1320 INIT_LIST_HEAD(&ptask->pt_link); 1321 1322 fwnet_send_packet(ptask); 1323 1324 return NETDEV_TX_OK; 1325 1326 fail_unlock: 1327 spin_unlock_irqrestore(&dev->lock, flags); 1328 fail: 1329 if (ptask) 1330 kmem_cache_free(fwnet_packet_task_cache, ptask); 1331 1332 if (skb != NULL) 1333 dev_kfree_skb(skb); 1334 1335 net->stats.tx_dropped++; 1336 net->stats.tx_errors++; 1337 1338 return NETDEV_TX_OK; 1339} 1340 1341static int fwnet_change_mtu(struct net_device *net, int new_mtu) 1342{ 1343 if (new_mtu < 68) 1344 return -EINVAL; 1345 1346 net->mtu = new_mtu; 1347 return 0; 1348} 1349 1350static void fwnet_get_drvinfo(struct net_device *net, 1351 struct ethtool_drvinfo *info) 1352{ 1353 strcpy(info->driver, KBUILD_MODNAME); 1354 strcpy(info->bus_info, "ieee1394"); 1355} 1356 1357static const struct ethtool_ops fwnet_ethtool_ops = { 1358 .get_drvinfo = fwnet_get_drvinfo, 1359}; 1360 1361static const struct net_device_ops fwnet_netdev_ops = { 1362 .ndo_open = fwnet_open, 1363 .ndo_stop = fwnet_stop, 1364 .ndo_start_xmit = fwnet_tx, 1365 .ndo_change_mtu = fwnet_change_mtu, 1366}; 1367 1368static void fwnet_init_dev(struct net_device *net) 1369{ 1370 net->header_ops = &fwnet_header_ops; 1371 net->netdev_ops = &fwnet_netdev_ops; 1372 net->watchdog_timeo = 2 * HZ; 1373 net->flags = IFF_BROADCAST | IFF_MULTICAST; 1374 net->features = NETIF_F_HIGHDMA; 1375 net->addr_len = FWNET_ALEN; 1376 net->hard_header_len = FWNET_HLEN; 1377 net->type = ARPHRD_IEEE1394; 1378 net->tx_queue_len = 10; 1379 SET_ETHTOOL_OPS(net, &fwnet_ethtool_ops); 1380} 1381 1382/* caller must hold fwnet_device_mutex */ 1383static struct fwnet_device *fwnet_dev_find(struct fw_card *card) 1384{ 1385 struct fwnet_device *dev; 1386 1387 list_for_each_entry(dev, &fwnet_device_list, dev_link) 1388 if (dev->card == card) 1389 return dev; 1390 1391 return NULL; 1392} 1393 1394static int fwnet_add_peer(struct fwnet_device *dev, 1395 struct fw_unit *unit, struct fw_device *device) 1396{ 1397 struct fwnet_peer *peer; 1398 1399 peer = kmalloc(sizeof(*peer), GFP_KERNEL); 1400 if (!peer) 1401 return -ENOMEM; 1402 1403 dev_set_drvdata(&unit->device, peer); 1404 1405 peer->dev = dev; 1406 peer->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4]; 1407 peer->fifo = FWNET_NO_FIFO_ADDR; 1408 INIT_LIST_HEAD(&peer->pd_list); 1409 peer->pdg_size = 0; 1410 peer->datagram_label = 0; 1411 peer->speed = device->max_speed; 1412 peer->max_payload = fwnet_max_payload(device->max_rec, peer->speed); 1413 1414 peer->generation = device->generation; 1415 smp_rmb(); 1416 peer->node_id = device->node_id; 1417 1418 spin_lock_irq(&dev->lock); 1419 list_add_tail(&peer->peer_link, &dev->peer_list); 1420 spin_unlock_irq(&dev->lock); 1421 1422 return 0; 1423} 1424 1425static int fwnet_probe(struct device *_dev) 1426{ 1427 struct fw_unit *unit = fw_unit(_dev); 1428 struct fw_device *device = fw_parent_device(unit); 1429 struct fw_card *card = device->card; 1430 struct net_device *net; 1431 bool allocated_netdev = false; 1432 struct fwnet_device *dev; 1433 unsigned max_mtu; 1434 int ret; 1435 1436 mutex_lock(&fwnet_device_mutex); 1437 1438 dev = fwnet_dev_find(card); 1439 if (dev) { 1440 net = dev->netdev; 1441 goto have_dev; 1442 } 1443 1444 net = alloc_netdev(sizeof(*dev), "firewire%d", fwnet_init_dev); 1445 if (net == NULL) { 1446 ret = -ENOMEM; 1447 goto out; 1448 } 1449 1450 allocated_netdev = true; 1451 SET_NETDEV_DEV(net, card->device); 1452 dev = netdev_priv(net); 1453 1454 spin_lock_init(&dev->lock); 1455 dev->broadcast_state = FWNET_BROADCAST_ERROR; 1456 dev->broadcast_rcv_context = NULL; 1457 dev->broadcast_xmt_max_payload = 0; 1458 dev->broadcast_xmt_datagramlabel = 0; 1459 1460 dev->local_fifo = FWNET_NO_FIFO_ADDR; 1461 1462 INIT_LIST_HEAD(&dev->packet_list); 1463 INIT_LIST_HEAD(&dev->broadcasted_list); 1464 INIT_LIST_HEAD(&dev->sent_list); 1465 INIT_LIST_HEAD(&dev->peer_list); 1466 1467 dev->card = card; 1468 dev->netdev = net; 1469 1470 /* 1471 * Use the RFC 2734 default 1500 octets or the maximum payload 1472 * as initial MTU 1473 */ 1474 max_mtu = (1 << (card->max_receive + 1)) 1475 - sizeof(struct rfc2734_header) - IEEE1394_GASP_HDR_SIZE; 1476 net->mtu = min(1500U, max_mtu); 1477 1478 /* Set our hardware address while we're at it */ 1479 put_unaligned_be64(card->guid, net->dev_addr); 1480 put_unaligned_be64(~0ULL, net->broadcast); 1481 ret = register_netdev(net); 1482 if (ret) { 1483 fw_error("Cannot register the driver\n"); 1484 goto out; 1485 } 1486 1487 list_add_tail(&dev->dev_link, &fwnet_device_list); 1488 fw_notify("%s: IPv4 over FireWire on device %016llx\n", 1489 net->name, (unsigned long long)card->guid); 1490 have_dev: 1491 ret = fwnet_add_peer(dev, unit, device); 1492 if (ret && allocated_netdev) { 1493 unregister_netdev(net); 1494 list_del(&dev->dev_link); 1495 } 1496 out: 1497 if (ret && allocated_netdev) 1498 free_netdev(net); 1499 1500 mutex_unlock(&fwnet_device_mutex); 1501 1502 return ret; 1503} 1504 1505static void fwnet_remove_peer(struct fwnet_peer *peer) 1506{ 1507 struct fwnet_partial_datagram *pd, *pd_next; 1508 1509 spin_lock_irq(&peer->dev->lock); 1510 list_del(&peer->peer_link); 1511 spin_unlock_irq(&peer->dev->lock); 1512 1513 list_for_each_entry_safe(pd, pd_next, &peer->pd_list, pd_link) 1514 fwnet_pd_delete(pd); 1515 1516 kfree(peer); 1517} 1518 1519static int fwnet_remove(struct device *_dev) 1520{ 1521 struct fwnet_peer *peer = dev_get_drvdata(_dev); 1522 struct fwnet_device *dev = peer->dev; 1523 struct net_device *net; 1524 struct fwnet_packet_task *ptask, *pt_next; 1525 1526 mutex_lock(&fwnet_device_mutex); 1527 1528 fwnet_remove_peer(peer); 1529 1530 if (list_empty(&dev->peer_list)) { 1531 net = dev->netdev; 1532 unregister_netdev(net); 1533 1534 if (dev->local_fifo != FWNET_NO_FIFO_ADDR) 1535 fw_core_remove_address_handler(&dev->handler); 1536 if (dev->broadcast_rcv_context) { 1537 fw_iso_context_stop(dev->broadcast_rcv_context); 1538 fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer, 1539 dev->card); 1540 fw_iso_context_destroy(dev->broadcast_rcv_context); 1541 } 1542 list_for_each_entry_safe(ptask, pt_next, 1543 &dev->packet_list, pt_link) { 1544 dev_kfree_skb_any(ptask->skb); 1545 kmem_cache_free(fwnet_packet_task_cache, ptask); 1546 } 1547 list_for_each_entry_safe(ptask, pt_next, 1548 &dev->broadcasted_list, pt_link) { 1549 dev_kfree_skb_any(ptask->skb); 1550 kmem_cache_free(fwnet_packet_task_cache, ptask); 1551 } 1552 list_for_each_entry_safe(ptask, pt_next, 1553 &dev->sent_list, pt_link) { 1554 dev_kfree_skb_any(ptask->skb); 1555 kmem_cache_free(fwnet_packet_task_cache, ptask); 1556 } 1557 list_del(&dev->dev_link); 1558 1559 free_netdev(net); 1560 } 1561 1562 mutex_unlock(&fwnet_device_mutex); 1563 1564 return 0; 1565} 1566 1567static void fwnet_update(struct fw_unit *unit) 1568{ 1569 struct fw_device *device = fw_parent_device(unit); 1570 struct fwnet_peer *peer = dev_get_drvdata(&unit->device); 1571 int generation; 1572 1573 generation = device->generation; 1574 1575 spin_lock_irq(&peer->dev->lock); 1576 peer->node_id = device->node_id; 1577 peer->generation = generation; 1578 spin_unlock_irq(&peer->dev->lock); 1579} 1580 1581static const struct ieee1394_device_id fwnet_id_table[] = { 1582 { 1583 .match_flags = IEEE1394_MATCH_SPECIFIER_ID | 1584 IEEE1394_MATCH_VERSION, 1585 .specifier_id = IANA_SPECIFIER_ID, 1586 .version = RFC2734_SW_VERSION, 1587 }, 1588 { } 1589}; 1590 1591static struct fw_driver fwnet_driver = { 1592 .driver = { 1593 .owner = THIS_MODULE, 1594 .name = "net", 1595 .bus = &fw_bus_type, 1596 .probe = fwnet_probe, 1597 .remove = fwnet_remove, 1598 }, 1599 .update = fwnet_update, 1600 .id_table = fwnet_id_table, 1601}; 1602 1603static const u32 rfc2374_unit_directory_data[] = { 1604 0x00040000, /* directory_length */ 1605 0x1200005e, /* unit_specifier_id: IANA */ 1606 0x81000003, /* textual descriptor offset */ 1607 0x13000001, /* unit_sw_version: RFC 2734 */ 1608 0x81000005, /* textual descriptor offset */ 1609 0x00030000, /* descriptor_length */ 1610 0x00000000, /* text */ 1611 0x00000000, /* minimal ASCII, en */ 1612 0x49414e41, /* I A N A */ 1613 0x00030000, /* descriptor_length */ 1614 0x00000000, /* text */ 1615 0x00000000, /* minimal ASCII, en */ 1616 0x49507634, /* I P v 4 */ 1617}; 1618 1619static struct fw_descriptor rfc2374_unit_directory = { 1620 .length = ARRAY_SIZE(rfc2374_unit_directory_data), 1621 .key = (CSR_DIRECTORY | CSR_UNIT) << 24, 1622 .data = rfc2374_unit_directory_data 1623}; 1624 1625static int __init fwnet_init(void) 1626{ 1627 int err; 1628 1629 err = fw_core_add_descriptor(&rfc2374_unit_directory); 1630 if (err) 1631 return err; 1632 1633 fwnet_packet_task_cache = kmem_cache_create("packet_task", 1634 sizeof(struct fwnet_packet_task), 0, 0, NULL); 1635 if (!fwnet_packet_task_cache) { 1636 err = -ENOMEM; 1637 goto out; 1638 } 1639 1640 err = driver_register(&fwnet_driver.driver); 1641 if (!err) 1642 return 0; 1643 1644 kmem_cache_destroy(fwnet_packet_task_cache); 1645out: 1646 fw_core_remove_descriptor(&rfc2374_unit_directory); 1647 1648 return err; 1649} 1650module_init(fwnet_init); 1651 1652static void __exit fwnet_cleanup(void) 1653{ 1654 driver_unregister(&fwnet_driver.driver); 1655 kmem_cache_destroy(fwnet_packet_task_cache); 1656 fw_core_remove_descriptor(&rfc2374_unit_directory); 1657} 1658module_exit(fwnet_cleanup); 1659 1660MODULE_AUTHOR("Jay Fenlason <fenlason@redhat.com>"); 1661MODULE_DESCRIPTION("IPv4 over IEEE1394 as per RFC 2734"); 1662MODULE_LICENSE("GPL"); 1663MODULE_DEVICE_TABLE(ieee1394, fwnet_id_table); 1664