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