Kernel

Kernel Git Source Tree

Root/drivers/firewire/net.c

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/compiler.h>
11	#include <linux/delay.h>
12	#include <linux/device.h>
13	#include <linux/ethtool.h>
14	#include <linux/firewire.h>
15	#include <linux/firewire-constants.h>
16	#include <linux/highmem.h>
17	#include <linux/in.h>
18	#include <linux/ip.h>
19	#include <linux/jiffies.h>
20	#include <linux/mod_devicetable.h>
21	#include <linux/module.h>
22	#include <linux/moduleparam.h>
23	#include <linux/mutex.h>
24	#include <linux/netdevice.h>
25	#include <linux/skbuff.h>
26	#include <linux/slab.h>
27	#include <linux/spinlock.h>
28
29	#include <asm/unaligned.h>
30	#include <net/arp.h>
31
32	/* rx limits */
33	#define FWNET_MAX_FRAGMENTS 30 /* arbitrary, > TX queue depth */
34	#define FWNET_ISO_PAGE_COUNT (PAGE_SIZE < 16*1024 ? 4 : 2)
35
36	/* tx limits */
37	#define FWNET_MAX_QUEUED_DATAGRAMS 20 /* < 64 = number of tlabels */
38	#define FWNET_MIN_QUEUED_DATAGRAMS 10 /* should keep AT DMA busy enough */
39	#define FWNET_TX_QUEUE_LEN FWNET_MAX_QUEUED_DATAGRAMS /* ? */
40
41	#define IEEE1394_BROADCAST_CHANNEL 31
42	#define IEEE1394_ALL_NODES (0xffc0 \| 0x003f)
43	#define IEEE1394_MAX_PAYLOAD_S100 512
44	#define FWNET_NO_FIFO_ADDR (~0ULL)
45
46	#define IANA_SPECIFIER_ID 0x00005eU
47	#define RFC2734_SW_VERSION 0x000001U
48
49	#define IEEE1394_GASP_HDR_SIZE 8
50
51	#define RFC2374_UNFRAG_HDR_SIZE 4
52	#define RFC2374_FRAG_HDR_SIZE 8
53	#define RFC2374_FRAG_OVERHEAD 4
54
55	#define RFC2374_HDR_UNFRAG 0 /* unfragmented */
56	#define RFC2374_HDR_FIRSTFRAG 1 /* first fragment */
57	#define RFC2374_HDR_LASTFRAG 2 /* last fragment */
58	#define RFC2374_HDR_INTFRAG 3 /* interior fragment */
59
60	#define RFC2734_HW_ADDR_LEN 16
61
62	struct rfc2734_arp {
63	__be16 hw_type; /* 0x0018 */
64	__be16 proto_type; /* 0x0806 */
65	u8 hw_addr_len; /* 16 */
66	u8 ip_addr_len; /* 4 */
67	__be16 opcode; /* ARP Opcode */
68	/* Above is exactly the same format as struct arphdr */
69
70	__be64 s_uniq_id; /* Sender's 64bit EUI */
71	u8 max_rec; /* Sender's max packet size */
72	u8 sspd; /* Sender's max speed */
73	__be16 fifo_hi; /* hi 16bits of sender's FIFO addr */
74	__be32 fifo_lo; /* lo 32bits of sender's FIFO addr */
75	__be32 sip; /* Sender's IP Address */
76	__be32 tip; /* IP Address of requested hw addr */
77	} __packed;
78
79	/* This header format is specific to this driver implementation. */
80	#define FWNET_ALEN 8
81	#define FWNET_HLEN 10
82	struct fwnet_header {
83	u8 h_dest[FWNET_ALEN]; /* destination address */
84	__be16 h_proto; /* packet type ID field */
85	} __packed;
86
87	/* IPv4 and IPv6 encapsulation header */
88	struct rfc2734_header {
89	u32 w0;
90	u32 w1;
91	};
92
93	#define fwnet_get_hdr_lf(h) (((h)->w0 & 0xc0000000) >> 30)
94	#define fwnet_get_hdr_ether_type(h) (((h)->w0 & 0x0000ffff))
95	#define fwnet_get_hdr_dg_size(h) (((h)->w0 & 0x0fff0000) >> 16)
96	#define fwnet_get_hdr_fg_off(h) (((h)->w0 & 0x00000fff))
97	#define fwnet_get_hdr_dgl(h) (((h)->w1 & 0xffff0000) >> 16)
98
99	#define fwnet_set_hdr_lf(lf) ((lf) << 30)
100	#define fwnet_set_hdr_ether_type(et) (et)
101	#define fwnet_set_hdr_dg_size(dgs) ((dgs) << 16)
102	#define fwnet_set_hdr_fg_off(fgo) (fgo)
103
104	#define fwnet_set_hdr_dgl(dgl) ((dgl) << 16)
105
106	static inline void fwnet_make_uf_hdr(struct rfc2734_header *hdr,
107	unsigned ether_type)
108	{
109	hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_UNFRAG)
110	\| fwnet_set_hdr_ether_type(ether_type);
111	}
112
113	static inline void fwnet_make_ff_hdr(struct rfc2734_header *hdr,
114	unsigned ether_type, unsigned dg_size, unsigned dgl)
115	{
116	hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_FIRSTFRAG)
117	\| fwnet_set_hdr_dg_size(dg_size)
118	\| fwnet_set_hdr_ether_type(ether_type);
119	hdr->w1 = fwnet_set_hdr_dgl(dgl);
120	}
121
122	static inline void fwnet_make_sf_hdr(struct rfc2734_header *hdr,
123	unsigned lf, unsigned dg_size, unsigned fg_off, unsigned dgl)
124	{
125	hdr->w0 = fwnet_set_hdr_lf(lf)
126	\| fwnet_set_hdr_dg_size(dg_size)
127	\| fwnet_set_hdr_fg_off(fg_off);
128	hdr->w1 = fwnet_set_hdr_dgl(dgl);
129	}
130
131	/* This list keeps track of what parts of the datagram have been filled in */
132	struct fwnet_fragment_info {
133	struct list_head fi_link;
134	u16 offset;
135	u16 len;
136	};
137
138	struct fwnet_partial_datagram {
139	struct list_head pd_link;
140	struct list_head fi_list;
141	struct sk_buff *skb;
142	/* FIXME Why not use skb->data? */
143	char *pbuf;
144	u16 datagram_label;
145	u16 ether_type;
146	u16 datagram_size;
147	};
148
149	static DEFINE_MUTEX(fwnet_device_mutex);
150	static LIST_HEAD(fwnet_device_list);
151
152	struct fwnet_device {
153	struct list_head dev_link;
154	spinlock_t lock;
155	enum {
156	FWNET_BROADCAST_ERROR,
157	FWNET_BROADCAST_RUNNING,
158	FWNET_BROADCAST_STOPPED,
159	} broadcast_state;
160	struct fw_iso_context *broadcast_rcv_context;
161	struct fw_iso_buffer broadcast_rcv_buffer;
162	void **broadcast_rcv_buffer_ptrs;
163	unsigned broadcast_rcv_next_ptr;
164	unsigned num_broadcast_rcv_ptrs;
165	unsigned rcv_buffer_size;
166	/*
167	* This value is the maximum unfragmented datagram size that can be
168	* sent by the hardware. It already has the GASP overhead and the
169	* unfragmented datagram header overhead calculated into it.
170	*/
171	unsigned broadcast_xmt_max_payload;
172	u16 broadcast_xmt_datagramlabel;
173
174	/*
175	* The CSR address that remote nodes must send datagrams to for us to
176	* receive them.
177	*/
178	struct fw_address_handler handler;
179	u64 local_fifo;
180
181	/* Number of tx datagrams that have been queued but not yet acked */
182	int queued_datagrams;
183
184	int peer_count;
185	struct list_head peer_list;
186	struct fw_card *card;
187	struct net_device *netdev;
188	};
189
190	struct fwnet_peer {
191	struct list_head peer_link;
192	struct fwnet_device *dev;
193	u64 guid;
194	u64 fifo;
195	__be32 ip;
196
197	/* guarded by dev->lock */
198	struct list_head pd_list; /* received partial datagrams */
199	unsigned pdg_size; /* pd_list size */
200
201	u16 datagram_label; /* outgoing datagram label */
202	u16 max_payload; /* includes RFC2374_FRAG_HDR_SIZE overhead */
203	int node_id;
204	int generation;
205	unsigned speed;
206	};
207
208	/* This is our task struct. It's used for the packet complete callback. */
209	struct fwnet_packet_task {
210	struct fw_transaction transaction;
211	struct rfc2734_header hdr;
212	struct sk_buff *skb;
213	struct fwnet_device *dev;
214
215	int outstanding_pkts;
216	u64 fifo_addr;
217	u16 dest_node;
218	u16 max_payload;
219	u8 generation;
220	u8 speed;
221	u8 enqueued;
222	};
223
224	/*
225	* saddr == NULL means use device source address.
226	* daddr == NULL means leave destination address (eg unresolved arp).
227	*/
228	static 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
252	static 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	dev_notice(&skb->dev->dev, "unable to resolve type %04x addresses\n",
260	be16_to_cpu(h->h_proto));
261	return 0;
262	}
263
264	static int fwnet_header_cache(const struct neighbour *neigh,
265	struct hh_cache *hh, __be16 type)
266	{
267	struct net_device *net;
268	struct fwnet_header *h;
269
270	if (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 = 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. */
282	static 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
288	static 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
295	static 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
303	/* FIXME: is this correct for all cases? */
304	static bool fwnet_frag_overlap(struct fwnet_partial_datagram *pd,
305	unsigned offset, unsigned len)
306	{
307	struct fwnet_fragment_info *fi;
308	unsigned end = offset + len;
309
310	list_for_each_entry(fi, &pd->fi_list, fi_link)
311	if (offset < fi->offset + fi->len && end > fi->offset)
312	return true;
313
314	return false;
315	}
316
317	/* Assumes that new fragment does not overlap any existing fragments */
318	static struct fwnet_fragment_info *fwnet_frag_new(
319	struct fwnet_partial_datagram *pd, unsigned offset, unsigned len)
320	{
321	struct fwnet_fragment_info fi, fi2, *new;
322	struct list_head *list;
323
324	list = &pd->fi_list;
325	list_for_each_entry(fi, &pd->fi_list, fi_link) {
326	if (fi->offset + fi->len == offset) {
327	/* The new fragment can be tacked on to the end */
328	/* Did the new fragment plug a hole? */
329	fi2 = list_entry(fi->fi_link.next,
330	struct fwnet_fragment_info, fi_link);
331	if (fi->offset + fi->len == fi2->offset) {
332	/* glue fragments together */
333	fi->len += len + fi2->len;
334	list_del(&fi2->fi_link);
335	kfree(fi2);
336	} else {
337	fi->len += len;
338	}
339
340	return fi;
341	}
342	if (offset + len == fi->offset) {
343	/* The new fragment can be tacked on to the beginning */
344	/* Did the new fragment plug a hole? */
345	fi2 = list_entry(fi->fi_link.prev,
346	struct fwnet_fragment_info, fi_link);
347	if (fi2->offset + fi2->len == fi->offset) {
348	/* glue fragments together */
349	fi2->len += fi->len + len;
350	list_del(&fi->fi_link);
351	kfree(fi);
352
353	return fi2;
354	}
355	fi->offset = offset;
356	fi->len += len;
357
358	return fi;
359	}
360	if (offset > fi->offset + fi->len) {
361	list = &fi->fi_link;
362	break;
363	}
364	if (offset + len < fi->offset) {
365	list = fi->fi_link.prev;
366	break;
367	}
368	}
369
370	new = kmalloc(sizeof(*new), GFP_ATOMIC);
371	if (!new) {
372	dev_err(&pd->skb->dev->dev, "out of memory\n");
373	return NULL;
374	}
375
376	new->offset = offset;
377	new->len = len;
378	list_add(&new->fi_link, list);
379
380	return new;
381	}
382
383	static struct fwnet_partial_datagram fwnet_pd_new(struct net_device net,
384	struct fwnet_peer *peer, u16 datagram_label, unsigned dg_size,
385	void *frag_buf, unsigned frag_off, unsigned frag_len)
386	{
387	struct fwnet_partial_datagram *new;
388	struct fwnet_fragment_info *fi;
389
390	new = kmalloc(sizeof(*new), GFP_ATOMIC);
391	if (!new)
392	goto fail;
393
394	INIT_LIST_HEAD(&new->fi_list);
395	fi = fwnet_frag_new(new, frag_off, frag_len);
396	if (fi == NULL)
397	goto fail_w_new;
398
399	new->datagram_label = datagram_label;
400	new->datagram_size = dg_size;
401	new->skb = dev_alloc_skb(dg_size + net->hard_header_len + 15);
402	if (new->skb == NULL)
403	goto fail_w_fi;
404
405	skb_reserve(new->skb, (net->hard_header_len + 15) & ~15);
406	new->pbuf = skb_put(new->skb, dg_size);
407	memcpy(new->pbuf + frag_off, frag_buf, frag_len);
408	list_add_tail(&new->pd_link, &peer->pd_list);
409
410	return new;
411
412	fail_w_fi:
413	kfree(fi);
414	fail_w_new:
415	kfree(new);
416	fail:
417	dev_err(&net->dev, "out of memory\n");
418
419	return NULL;
420	}
421
422	static struct fwnet_partial_datagram fwnet_pd_find(struct fwnet_peer peer,
423	u16 datagram_label)
424	{
425	struct fwnet_partial_datagram *pd;
426
427	list_for_each_entry(pd, &peer->pd_list, pd_link)
428	if (pd->datagram_label == datagram_label)
429	return pd;
430
431	return NULL;
432	}
433
434
435	static void fwnet_pd_delete(struct fwnet_partial_datagram *old)
436	{
437	struct fwnet_fragment_info fi, n;
438
439	list_for_each_entry_safe(fi, n, &old->fi_list, fi_link)
440	kfree(fi);
441
442	list_del(&old->pd_link);
443	dev_kfree_skb_any(old->skb);
444	kfree(old);
445	}
446
447	static bool fwnet_pd_update(struct fwnet_peer *peer,
448	struct fwnet_partial_datagram pd, void frag_buf,
449	unsigned frag_off, unsigned frag_len)
450	{
451	if (fwnet_frag_new(pd, frag_off, frag_len) == NULL)
452	return false;
453
454	memcpy(pd->pbuf + frag_off, frag_buf, frag_len);
455
456	/*
457	* Move list entry to beginning of list so that oldest partial
458	* datagrams percolate to the end of the list
459	*/
460	list_move_tail(&pd->pd_link, &peer->pd_list);
461
462	return true;
463	}
464
465	static bool fwnet_pd_is_complete(struct fwnet_partial_datagram *pd)
466	{
467	struct fwnet_fragment_info *fi;
468
469	fi = list_entry(pd->fi_list.next, struct fwnet_fragment_info, fi_link);
470
471	return fi->len == pd->datagram_size;
472	}
473
474	/* caller must hold dev->lock */
475	static struct fwnet_peer fwnet_peer_find_by_guid(struct fwnet_device dev,
476	u64 guid)
477	{
478	struct fwnet_peer *peer;
479
480	list_for_each_entry(peer, &dev->peer_list, peer_link)
481	if (peer->guid == guid)
482	return peer;
483
484	return NULL;
485	}
486
487	/* caller must hold dev->lock */
488	static struct fwnet_peer fwnet_peer_find_by_node_id(struct fwnet_device dev,
489	int node_id, int generation)
490	{
491	struct fwnet_peer *peer;
492
493	list_for_each_entry(peer, &dev->peer_list, peer_link)
494	if (peer->node_id == node_id &&
495	peer->generation == generation)
496	return peer;
497
498	return NULL;
499	}
500
501	/* See IEEE 1394-2008 table 6-4, table 8-8, table 16-18. */
502	static unsigned fwnet_max_payload(unsigned max_rec, unsigned speed)
503	{
504	max_rec = min(max_rec, speed + 8);
505	max_rec = clamp(max_rec, 8U, 11U); /* 512...4096 */
506
507	return (1 << (max_rec + 1)) - RFC2374_FRAG_HDR_SIZE;
508	}
509
510
511	static int fwnet_finish_incoming_packet(struct net_device *net,
512	struct sk_buff *skb, u16 source_node_id,
513	bool is_broadcast, u16 ether_type)
514	{
515	struct fwnet_device *dev;
516	static const __be64 broadcast_hw = cpu_to_be64(~0ULL);
517	int status;
518	__be64 guid;
519
520	dev = netdev_priv(net);
521	/* Write metadata, and then pass to the receive level */
522	skb->dev = net;
523	skb->ip_summed = CHECKSUM_UNNECESSARY; /* don't check it */
524
525	/*
526	* Parse the encapsulation header. This actually does the job of
527	* converting to an ethernet frame header, as well as arp
528	* conversion if needed. ARP conversion is easier in this
529	* direction, since we are using ethernet as our backend.
530	*/
531	/*
532	* If this is an ARP packet, convert it. First, we want to make
533	* use of some of the fields, since they tell us a little bit
534	* about the sending machine.
535	*/
536	if (ether_type == ETH_P_ARP) {
537	struct rfc2734_arp *arp1394;
538	struct arphdr *arp;
539	unsigned char *arp_ptr;
540	u64 fifo_addr;
541	u64 peer_guid;
542	unsigned sspd;
543	u16 max_payload;
544	struct fwnet_peer *peer;
545	unsigned long flags;
546
547	arp1394 = (struct rfc2734_arp *)skb->data;
548	arp = (struct arphdr *)skb->data;
549	arp_ptr = (unsigned char *)(arp + 1);
550	peer_guid = get_unaligned_be64(&arp1394->s_uniq_id);
551	fifo_addr = (u64)get_unaligned_be16(&arp1394->fifo_hi) << 32
552	\| get_unaligned_be32(&arp1394->fifo_lo);
553
554	sspd = arp1394->sspd;
555	/* Sanity check. OS X 10.3 PPC reportedly sends 131. */
556	if (sspd > SCODE_3200) {
557	dev_notice(&net->dev, "sspd %x out of range\n", sspd);
558	sspd = SCODE_3200;
559	}
560	max_payload = fwnet_max_payload(arp1394->max_rec, sspd);
561
562	spin_lock_irqsave(&dev->lock, flags);
563	peer = fwnet_peer_find_by_guid(dev, peer_guid);
564	if (peer) {
565	peer->fifo = fifo_addr;
566
567	if (peer->speed > sspd)
568	peer->speed = sspd;
569	if (peer->max_payload > max_payload)
570	peer->max_payload = max_payload;
571
572	peer->ip = arp1394->sip;
573	}
574	spin_unlock_irqrestore(&dev->lock, flags);
575
576	if (!peer) {
577	dev_notice(&net->dev,
578	"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	#if 0
626	else
627	skb->pkt_type = PACKET_MULTICAST;
628	#endif
629	} else {
630	if (memcmp(eth->h_dest, net->dev_addr, net->addr_len))
631	skb->pkt_type = PACKET_OTHERHOST;
632	}
633	if (ntohs(eth->h_proto) >= 1536) {
634	protocol = eth->h_proto;
635	} else {
636	rawp = (u16 *)skb->data;
637	if (*rawp == 0xffff)
638	protocol = htons(ETH_P_802_3);
639	else
640	protocol = htons(ETH_P_802_2);
641	}
642	skb->protocol = protocol;
643	}
644	status = netif_rx(skb);
645	if (status == NET_RX_DROP) {
646	net->stats.rx_errors++;
647	net->stats.rx_dropped++;
648	} else {
649	net->stats.rx_packets++;
650	net->stats.rx_bytes += skb->len;
651	}
652
653	return 0;
654
655	no_peer:
656	net->stats.rx_errors++;
657	net->stats.rx_dropped++;
658
659	dev_kfree_skb_any(skb);
660
661	return -ENOENT;
662	}
663
664	static 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	dev_err(&net->dev, "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	retval = 0;
792	fail:
793	spin_unlock_irqrestore(&dev->lock, flags);
794
795	return retval;
796	}
797
798	static void fwnet_receive_packet(struct fw_card card, struct fw_request r,
799	int tcode, int destination, int source, int generation,
800	unsigned long long offset, void *payload, size_t length,
801	void *callback_data)
802	{
803	struct fwnet_device *dev = callback_data;
804	int rcode;
805
806	if (destination == IEEE1394_ALL_NODES) {
807	kfree(r);
808
809	return;
810	}
811
812	if (offset != dev->handler.offset)
813	rcode = RCODE_ADDRESS_ERROR;
814	else if (tcode != TCODE_WRITE_BLOCK_REQUEST)
815	rcode = RCODE_TYPE_ERROR;
816	else if (fwnet_incoming_packet(dev, payload, length,
817	source, generation, false) != 0) {
818	dev_err(&dev->netdev->dev, "incoming packet failure\n");
819	rcode = RCODE_CONFLICT_ERROR;
820	} else
821	rcode = RCODE_COMPLETE;
822
823	fw_send_response(card, r, rcode);
824	}
825
826	static void fwnet_receive_broadcast(struct fw_iso_context *context,
827	u32 cycle, size_t header_length, void header, void data)
828	{
829	struct fwnet_device *dev;
830	struct fw_iso_packet packet;
831	struct fw_card *card;
832	__be16 *hdr_ptr;
833	__be32 *buf_ptr;
834	int retval;
835	u32 length;
836	u16 source_node_id;
837	u32 specifier_id;
838	u32 ver;
839	unsigned long offset;
840	unsigned long flags;
841
842	dev = data;
843	card = dev->card;
844	hdr_ptr = header;
845	length = be16_to_cpup(hdr_ptr);
846
847	spin_lock_irqsave(&dev->lock, flags);
848
849	offset = dev->rcv_buffer_size * dev->broadcast_rcv_next_ptr;
850	buf_ptr = dev->broadcast_rcv_buffer_ptrs[dev->broadcast_rcv_next_ptr++];
851	if (dev->broadcast_rcv_next_ptr == dev->num_broadcast_rcv_ptrs)
852	dev->broadcast_rcv_next_ptr = 0;
853
854	spin_unlock_irqrestore(&dev->lock, flags);
855
856	specifier_id = (be32_to_cpu(buf_ptr[0]) & 0xffff) << 8
857	\| (be32_to_cpu(buf_ptr[1]) & 0xff000000) >> 24;
858	ver = be32_to_cpu(buf_ptr[1]) & 0xffffff;
859	source_node_id = be32_to_cpu(buf_ptr[0]) >> 16;
860
861	if (specifier_id == IANA_SPECIFIER_ID && ver == RFC2734_SW_VERSION) {
862	buf_ptr += 2;
863	length -= IEEE1394_GASP_HDR_SIZE;
864	fwnet_incoming_packet(dev, buf_ptr, length,
865	source_node_id, -1, true);
866	}
867
868	packet.payload_length = dev->rcv_buffer_size;
869	packet.interrupt = 1;
870	packet.skip = 0;
871	packet.tag = 3;
872	packet.sy = 0;
873	packet.header_length = IEEE1394_GASP_HDR_SIZE;
874
875	spin_lock_irqsave(&dev->lock, flags);
876
877	retval = fw_iso_context_queue(dev->broadcast_rcv_context, &packet,
878	&dev->broadcast_rcv_buffer, offset);
879
880	spin_unlock_irqrestore(&dev->lock, flags);
881
882	if (retval >= 0)
883	fw_iso_context_queue_flush(dev->broadcast_rcv_context);
884	else
885	dev_err(&dev->netdev->dev, "requeue failed\n");
886	}
887
888	static struct kmem_cache *fwnet_packet_task_cache;
889
890	static void fwnet_free_ptask(struct fwnet_packet_task *ptask)
891	{
892	dev_kfree_skb_any(ptask->skb);
893	kmem_cache_free(fwnet_packet_task_cache, ptask);
894	}
895
896	/* Caller must hold dev->lock. */
897	static void dec_queued_datagrams(struct fwnet_device *dev)
898	{
899	if (--dev->queued_datagrams == FWNET_MIN_QUEUED_DATAGRAMS)
900	netif_wake_queue(dev->netdev);
901	}
902
903	static int fwnet_send_packet(struct fwnet_packet_task *ptask);
904
905	static void fwnet_transmit_packet_done(struct fwnet_packet_task *ptask)
906	{
907	struct fwnet_device *dev = ptask->dev;
908	struct sk_buff *skb = ptask->skb;
909	unsigned long flags;
910	bool free;
911
912	spin_lock_irqsave(&dev->lock, flags);
913
914	ptask->outstanding_pkts--;
915
916	/* Check whether we or the networking TX soft-IRQ is last user. */
917	free = (ptask->outstanding_pkts == 0 && ptask->enqueued);
918	if (free)
919	dec_queued_datagrams(dev);
920
921	if (ptask->outstanding_pkts == 0) {
922	dev->netdev->stats.tx_packets++;
923	dev->netdev->stats.tx_bytes += skb->len;
924	}
925
926	spin_unlock_irqrestore(&dev->lock, flags);
927
928	if (ptask->outstanding_pkts > 0) {
929	u16 dg_size;
930	u16 fg_off;
931	u16 datagram_label;
932	u16 lf;
933
934	/* Update the ptask to point to the next fragment and send it */
935	lf = fwnet_get_hdr_lf(&ptask->hdr);
936	switch (lf) {
937	case RFC2374_HDR_LASTFRAG:
938	case RFC2374_HDR_UNFRAG:
939	default:
940	dev_err(&dev->netdev->dev,
941	"outstanding packet %x lf %x, header %x,%x\n",
942	ptask->outstanding_pkts, lf, ptask->hdr.w0,
943	ptask->hdr.w1);
944	BUG();
945
946	case RFC2374_HDR_FIRSTFRAG:
947	/* Set frag type here for future interior fragments */
948	dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
949	fg_off = ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
950	datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
951	break;
952
953	case RFC2374_HDR_INTFRAG:
954	dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
955	fg_off = fwnet_get_hdr_fg_off(&ptask->hdr)
956	+ ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
957	datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
958	break;
959	}
960
961	skb_pull(skb, ptask->max_payload);
962	if (ptask->outstanding_pkts > 1) {
963	fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_INTFRAG,
964	dg_size, fg_off, datagram_label);
965	} else {
966	fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_LASTFRAG,
967	dg_size, fg_off, datagram_label);
968	ptask->max_payload = skb->len + RFC2374_FRAG_HDR_SIZE;
969	}
970	fwnet_send_packet(ptask);
971	}
972
973	if (free)
974	fwnet_free_ptask(ptask);
975	}
976
977	static void fwnet_transmit_packet_failed(struct fwnet_packet_task *ptask)
978	{
979	struct fwnet_device *dev = ptask->dev;
980	unsigned long flags;
981	bool free;
982
983	spin_lock_irqsave(&dev->lock, flags);
984
985	/* One fragment failed; don't try to send remaining fragments. */
986	ptask->outstanding_pkts = 0;
987
988	/* Check whether we or the networking TX soft-IRQ is last user. */
989	free = ptask->enqueued;
990	if (free)
991	dec_queued_datagrams(dev);
992
993	dev->netdev->stats.tx_dropped++;
994	dev->netdev->stats.tx_errors++;
995
996	spin_unlock_irqrestore(&dev->lock, flags);
997
998	if (free)
999	fwnet_free_ptask(ptask);
1000	}
1001
1002	static void fwnet_write_complete(struct fw_card *card, int rcode,
1003	void payload, size_t length, void data)
1004	{
1005	struct fwnet_packet_task *ptask = data;
1006	static unsigned long j;
1007	static int last_rcode, errors_skipped;
1008
1009	if (rcode == RCODE_COMPLETE) {
1010	fwnet_transmit_packet_done(ptask);
1011	} else {
1012	fwnet_transmit_packet_failed(ptask);
1013
1014	if (printk_timed_ratelimit(&j, 1000) \|\| rcode != last_rcode) {
1015	dev_err(&ptask->dev->netdev->dev,
1016	"fwnet_write_complete failed: %x (skipped %d)\n",
1017	rcode, errors_skipped);
1018
1019	errors_skipped = 0;
1020	last_rcode = rcode;
1021	} else
1022	errors_skipped++;
1023	}
1024	}
1025
1026	static int fwnet_send_packet(struct fwnet_packet_task *ptask)
1027	{
1028	struct fwnet_device *dev;
1029	unsigned tx_len;
1030	struct rfc2734_header *bufhdr;
1031	unsigned long flags;
1032	bool free;
1033
1034	dev = ptask->dev;
1035	tx_len = ptask->max_payload;
1036	switch (fwnet_get_hdr_lf(&ptask->hdr)) {
1037	case RFC2374_HDR_UNFRAG:
1038	bufhdr = (struct rfc2734_header *)
1039	skb_push(ptask->skb, RFC2374_UNFRAG_HDR_SIZE);
1040	put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
1041	break;
1042
1043	case RFC2374_HDR_FIRSTFRAG:
1044	case RFC2374_HDR_INTFRAG:
1045	case RFC2374_HDR_LASTFRAG:
1046	bufhdr = (struct rfc2734_header *)
1047	skb_push(ptask->skb, RFC2374_FRAG_HDR_SIZE);
1048	put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
1049	put_unaligned_be32(ptask->hdr.w1, &bufhdr->w1);
1050	break;
1051
1052	default:
1053	BUG();
1054	}
1055	if (ptask->dest_node == IEEE1394_ALL_NODES) {
1056	u8 *p;
1057	int generation;
1058	int node_id;
1059
1060	/* ptask->generation may not have been set yet */
1061	generation = dev->card->generation;
1062	smp_rmb();
1063	node_id = dev->card->node_id;
1064
1065	p = skb_push(ptask->skb, 8);
1066	put_unaligned_be32(node_id << 16 \| IANA_SPECIFIER_ID >> 8, p);
1067	put_unaligned_be32((IANA_SPECIFIER_ID & 0xff) << 24
1068	\| RFC2734_SW_VERSION, &p[4]);
1069
1070	/* We should not transmit if broadcast_channel.valid == 0. */
1071	fw_send_request(dev->card, &ptask->transaction,
1072	TCODE_STREAM_DATA,
1073	fw_stream_packet_destination_id(3,
1074	IEEE1394_BROADCAST_CHANNEL, 0),
1075	generation, SCODE_100, 0ULL, ptask->skb->data,
1076	tx_len + 8, fwnet_write_complete, ptask);
1077
1078	spin_lock_irqsave(&dev->lock, flags);
1079
1080	/* If the AT tasklet already ran, we may be last user. */
1081	free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1082	if (!free)
1083	ptask->enqueued = true;
1084	else
1085	dec_queued_datagrams(dev);
1086
1087	spin_unlock_irqrestore(&dev->lock, flags);
1088
1089	goto out;
1090	}
1091
1092	fw_send_request(dev->card, &ptask->transaction,
1093	TCODE_WRITE_BLOCK_REQUEST, ptask->dest_node,
1094	ptask->generation, ptask->speed, ptask->fifo_addr,
1095	ptask->skb->data, tx_len, fwnet_write_complete, ptask);
1096
1097	spin_lock_irqsave(&dev->lock, flags);
1098
1099	/* If the AT tasklet already ran, we may be last user. */
1100	free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1101	if (!free)
1102	ptask->enqueued = true;
1103	else
1104	dec_queued_datagrams(dev);
1105
1106	spin_unlock_irqrestore(&dev->lock, flags);
1107
1108	dev->netdev->trans_start = jiffies;
1109	out:
1110	if (free)
1111	fwnet_free_ptask(ptask);
1112
1113	return 0;
1114	}
1115
1116	static int fwnet_broadcast_start(struct fwnet_device *dev)
1117	{
1118	struct fw_iso_context *context;
1119	int retval;
1120	unsigned num_packets;
1121	unsigned max_receive;
1122	struct fw_iso_packet packet;
1123	unsigned long offset;
1124	unsigned u;
1125
1126	if (dev->local_fifo == FWNET_NO_FIFO_ADDR) {
1127	dev->handler.length = 4096;
1128	dev->handler.address_callback = fwnet_receive_packet;
1129	dev->handler.callback_data = dev;
1130
1131	retval = fw_core_add_address_handler(&dev->handler,
1132	&fw_high_memory_region);
1133	if (retval < 0)
1134	goto failed_initial;
1135
1136	dev->local_fifo = dev->handler.offset;
1137	}
1138
1139	max_receive = 1U << (dev->card->max_receive + 1);
1140	num_packets = (FWNET_ISO_PAGE_COUNT * PAGE_SIZE) / max_receive;
1141
1142	if (!dev->broadcast_rcv_context) {
1143	void **ptrptr;
1144
1145	context = fw_iso_context_create(dev->card,
1146	FW_ISO_CONTEXT_RECEIVE, IEEE1394_BROADCAST_CHANNEL,
1147	dev->card->link_speed, 8, fwnet_receive_broadcast, dev);
1148	if (IS_ERR(context)) {
1149	retval = PTR_ERR(context);
1150	goto failed_context_create;
1151	}
1152
1153	retval = fw_iso_buffer_init(&dev->broadcast_rcv_buffer,
1154	dev->card, FWNET_ISO_PAGE_COUNT, DMA_FROM_DEVICE);
1155	if (retval < 0)
1156	goto failed_buffer_init;
1157
1158	ptrptr = kmalloc(sizeof(void ) num_packets, GFP_KERNEL);
1159	if (!ptrptr) {
1160	retval = -ENOMEM;
1161	goto failed_ptrs_alloc;
1162	}
1163
1164	dev->broadcast_rcv_buffer_ptrs = ptrptr;
1165	for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++) {
1166	void *ptr;
1167	unsigned v;
1168
1169	ptr = kmap(dev->broadcast_rcv_buffer.pages[u]);
1170	for (v = 0; v < num_packets / FWNET_ISO_PAGE_COUNT; v++)
1171	ptrptr++ = (void )
1172	((char )ptr + v max_receive);
1173	}
1174	dev->broadcast_rcv_context = context;
1175	} else {
1176	context = dev->broadcast_rcv_context;
1177	}
1178
1179	packet.payload_length = max_receive;
1180	packet.interrupt = 1;
1181	packet.skip = 0;
1182	packet.tag = 3;
1183	packet.sy = 0;
1184	packet.header_length = IEEE1394_GASP_HDR_SIZE;
1185	offset = 0;
1186
1187	for (u = 0; u < num_packets; u++) {
1188	retval = fw_iso_context_queue(context, &packet,
1189	&dev->broadcast_rcv_buffer, offset);
1190	if (retval < 0)
1191	goto failed_rcv_queue;
1192
1193	offset += max_receive;
1194	}
1195	dev->num_broadcast_rcv_ptrs = num_packets;
1196	dev->rcv_buffer_size = max_receive;
1197	dev->broadcast_rcv_next_ptr = 0U;
1198	retval = fw_iso_context_start(context, -1, 0,
1199	FW_ISO_CONTEXT_MATCH_ALL_TAGS); /* ??? sync */
1200	if (retval < 0)
1201	goto failed_rcv_queue;
1202
1203	/* FIXME: adjust it according to the min. speed of all known peers? */
1204	dev->broadcast_xmt_max_payload = IEEE1394_MAX_PAYLOAD_S100
1205	- IEEE1394_GASP_HDR_SIZE - RFC2374_UNFRAG_HDR_SIZE;
1206	dev->broadcast_state = FWNET_BROADCAST_RUNNING;
1207
1208	return 0;
1209
1210	failed_rcv_queue:
1211	kfree(dev->broadcast_rcv_buffer_ptrs);
1212	dev->broadcast_rcv_buffer_ptrs = NULL;
1213	failed_ptrs_alloc:
1214	fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer, dev->card);
1215	failed_buffer_init:
1216	fw_iso_context_destroy(context);
1217	dev->broadcast_rcv_context = NULL;
1218	failed_context_create:
1219	fw_core_remove_address_handler(&dev->handler);
1220	failed_initial:
1221	dev->local_fifo = FWNET_NO_FIFO_ADDR;
1222
1223	return retval;
1224	}
1225
1226	static void set_carrier_state(struct fwnet_device *dev)
1227	{
1228	if (dev->peer_count > 1)
1229	netif_carrier_on(dev->netdev);
1230	else
1231	netif_carrier_off(dev->netdev);
1232	}
1233
1234	/* ifup */
1235	static int fwnet_open(struct net_device *net)
1236	{
1237	struct fwnet_device *dev = netdev_priv(net);
1238	int ret;
1239
1240	if (dev->broadcast_state == FWNET_BROADCAST_ERROR) {
1241	ret = fwnet_broadcast_start(dev);
1242	if (ret)
1243	return ret;
1244	}
1245	netif_start_queue(net);
1246
1247	spin_lock_irq(&dev->lock);
1248	set_carrier_state(dev);
1249	spin_unlock_irq(&dev->lock);
1250
1251	return 0;
1252	}
1253
1254	/* ifdown */
1255	static int fwnet_stop(struct net_device *net)
1256	{
1257	netif_stop_queue(net);
1258
1259	/* Deallocate iso context for use by other applications? */
1260
1261	return 0;
1262	}
1263
1264	static netdev_tx_t fwnet_tx(struct sk_buff skb, struct net_device net)
1265	{
1266	struct fwnet_header hdr_buf;
1267	struct fwnet_device *dev = netdev_priv(net);
1268	__be16 proto;
1269	u16 dest_node;
1270	unsigned max_payload;
1271	u16 dg_size;
1272	u16 *datagram_label_ptr;
1273	struct fwnet_packet_task *ptask;
1274	struct fwnet_peer *peer;
1275	unsigned long flags;
1276
1277	spin_lock_irqsave(&dev->lock, flags);
1278
1279	/* Can this happen? */
1280	if (netif_queue_stopped(dev->netdev)) {
1281	spin_unlock_irqrestore(&dev->lock, flags);
1282
1283	return NETDEV_TX_BUSY;
1284	}
1285
1286	ptask = kmem_cache_alloc(fwnet_packet_task_cache, GFP_ATOMIC);
1287	if (ptask == NULL)
1288	goto fail;
1289
1290	skb = skb_share_check(skb, GFP_ATOMIC);
1291	if (!skb)
1292	goto fail;
1293
1294	/*
1295	* Make a copy of the driver-specific header.
1296	* We might need to rebuild the header on tx failure.
1297	*/
1298	memcpy(&hdr_buf, skb->data, sizeof(hdr_buf));
1299	skb_pull(skb, sizeof(hdr_buf));
1300
1301	proto = hdr_buf.h_proto;
1302	dg_size = skb->len;
1303
1304	/*
1305	* Set the transmission type for the packet. ARP packets and IP
1306	* broadcast packets are sent via GASP.
1307	*/
1308	if (memcmp(hdr_buf.h_dest, net->broadcast, FWNET_ALEN) == 0
1309	\|\| proto == htons(ETH_P_ARP)
1310	\|\| (proto == htons(ETH_P_IP)
1311	&& IN_MULTICAST(ntohl(ip_hdr(skb)->daddr)))) {
1312	max_payload = dev->broadcast_xmt_max_payload;
1313	datagram_label_ptr = &dev->broadcast_xmt_datagramlabel;
1314
1315	ptask->fifo_addr = FWNET_NO_FIFO_ADDR;
1316	ptask->generation = 0;
1317	ptask->dest_node = IEEE1394_ALL_NODES;
1318	ptask->speed = SCODE_100;
1319	} else {
1320	__be64 guid = get_unaligned((__be64 *)hdr_buf.h_dest);
1321	u8 generation;
1322
1323	peer = fwnet_peer_find_by_guid(dev, be64_to_cpu(guid));
1324	if (!peer \|\| peer->fifo == FWNET_NO_FIFO_ADDR)
1325	goto fail;
1326
1327	generation = peer->generation;
1328	dest_node = peer->node_id;
1329	max_payload = peer->max_payload;
1330	datagram_label_ptr = &peer->datagram_label;
1331
1332	ptask->fifo_addr = peer->fifo;
1333	ptask->generation = generation;
1334	ptask->dest_node = dest_node;
1335	ptask->speed = peer->speed;
1336	}
1337
1338	/* If this is an ARP packet, convert it */
1339	if (proto == htons(ETH_P_ARP)) {
1340	struct arphdr arp = (struct arphdr )skb->data;
1341	unsigned char arp_ptr = (unsigned char )(arp + 1);
1342	struct rfc2734_arp arp1394 = (struct rfc2734_arp )skb->data;
1343	__be32 ipaddr;
1344
1345	ipaddr = get_unaligned((__be32 *)(arp_ptr + FWNET_ALEN));
1346
1347	arp1394->hw_addr_len = RFC2734_HW_ADDR_LEN;
1348	arp1394->max_rec = dev->card->max_receive;
1349	arp1394->sspd = dev->card->link_speed;
1350
1351	put_unaligned_be16(dev->local_fifo >> 32,
1352	&arp1394->fifo_hi);
1353	put_unaligned_be32(dev->local_fifo & 0xffffffff,
1354	&arp1394->fifo_lo);
1355	put_unaligned(ipaddr, &arp1394->sip);
1356	}
1357
1358	ptask->hdr.w0 = 0;
1359	ptask->hdr.w1 = 0;
1360	ptask->skb = skb;
1361	ptask->dev = dev;
1362
1363	/* Does it all fit in one packet? */
1364	if (dg_size <= max_payload) {
1365	fwnet_make_uf_hdr(&ptask->hdr, ntohs(proto));
1366	ptask->outstanding_pkts = 1;
1367	max_payload = dg_size + RFC2374_UNFRAG_HDR_SIZE;
1368	} else {
1369	u16 datagram_label;
1370
1371	max_payload -= RFC2374_FRAG_OVERHEAD;
1372	datagram_label = (*datagram_label_ptr)++;
1373	fwnet_make_ff_hdr(&ptask->hdr, ntohs(proto), dg_size,
1374	datagram_label);
1375	ptask->outstanding_pkts = DIV_ROUND_UP(dg_size, max_payload);
1376	max_payload += RFC2374_FRAG_HDR_SIZE;
1377	}
1378
1379	if (++dev->queued_datagrams == FWNET_MAX_QUEUED_DATAGRAMS)
1380	netif_stop_queue(dev->netdev);
1381
1382	spin_unlock_irqrestore(&dev->lock, flags);
1383
1384	ptask->max_payload = max_payload;
1385	ptask->enqueued = 0;
1386
1387	fwnet_send_packet(ptask);
1388
1389	return NETDEV_TX_OK;
1390
1391	fail:
1392	spin_unlock_irqrestore(&dev->lock, flags);
1393
1394	if (ptask)
1395	kmem_cache_free(fwnet_packet_task_cache, ptask);
1396
1397	if (skb != NULL)
1398	dev_kfree_skb(skb);
1399
1400	net->stats.tx_dropped++;
1401	net->stats.tx_errors++;
1402
1403	/*
1404	* FIXME: According to a patch from 2003-02-26, "returning non-zero
1405	* causes serious problems" here, allegedly. Before that patch,
1406	* -ERRNO was returned which is not appropriate under Linux 2.6.
1407	* Perhaps more needs to be done? Stop the queue in serious
1408	* conditions and restart it elsewhere?
1409	*/
1410	return NETDEV_TX_OK;
1411	}
1412
1413	static int fwnet_change_mtu(struct net_device *net, int new_mtu)
1414	{
1415	if (new_mtu < 68)
1416	return -EINVAL;
1417
1418	net->mtu = new_mtu;
1419	return 0;
1420	}
1421
1422	static const struct ethtool_ops fwnet_ethtool_ops = {
1423	.get_link = ethtool_op_get_link,
1424	};
1425
1426	static const struct net_device_ops fwnet_netdev_ops = {
1427	.ndo_open = fwnet_open,
1428	.ndo_stop = fwnet_stop,
1429	.ndo_start_xmit = fwnet_tx,
1430	.ndo_change_mtu = fwnet_change_mtu,
1431	};
1432
1433	static void fwnet_init_dev(struct net_device *net)
1434	{
1435	net->header_ops = &fwnet_header_ops;
1436	net->netdev_ops = &fwnet_netdev_ops;
1437	net->watchdog_timeo = 2 * HZ;
1438	net->flags = IFF_BROADCAST \| IFF_MULTICAST;
1439	net->features = NETIF_F_HIGHDMA;
1440	net->addr_len = FWNET_ALEN;
1441	net->hard_header_len = FWNET_HLEN;
1442	net->type = ARPHRD_IEEE1394;
1443	net->tx_queue_len = FWNET_TX_QUEUE_LEN;
1444	net->ethtool_ops = &fwnet_ethtool_ops;
1445	}
1446
1447	/* caller must hold fwnet_device_mutex */
1448	static struct fwnet_device fwnet_dev_find(struct fw_card card)
1449	{
1450	struct fwnet_device *dev;
1451
1452	list_for_each_entry(dev, &fwnet_device_list, dev_link)
1453	if (dev->card == card)
1454	return dev;
1455
1456	return NULL;
1457	}
1458
1459	static int fwnet_add_peer(struct fwnet_device *dev,
1460	struct fw_unit unit, struct fw_device device)
1461	{
1462	struct fwnet_peer *peer;
1463
1464	peer = kmalloc(sizeof(*peer), GFP_KERNEL);
1465	if (!peer)
1466	return -ENOMEM;
1467
1468	dev_set_drvdata(&unit->device, peer);
1469
1470	peer->dev = dev;
1471	peer->guid = (u64)device->config_rom[3] << 32 \| device->config_rom[4];
1472	peer->fifo = FWNET_NO_FIFO_ADDR;
1473	peer->ip = 0;
1474	INIT_LIST_HEAD(&peer->pd_list);
1475	peer->pdg_size = 0;
1476	peer->datagram_label = 0;
1477	peer->speed = device->max_speed;
1478	peer->max_payload = fwnet_max_payload(device->max_rec, peer->speed);
1479
1480	peer->generation = device->generation;
1481	smp_rmb();
1482	peer->node_id = device->node_id;
1483
1484	spin_lock_irq(&dev->lock);
1485	list_add_tail(&peer->peer_link, &dev->peer_list);
1486	dev->peer_count++;
1487	set_carrier_state(dev);
1488	spin_unlock_irq(&dev->lock);
1489
1490	return 0;
1491	}
1492
1493	static int fwnet_probe(struct device *_dev)
1494	{
1495	struct fw_unit *unit = fw_unit(_dev);
1496	struct fw_device *device = fw_parent_device(unit);
1497	struct fw_card *card = device->card;
1498	struct net_device *net;
1499	bool allocated_netdev = false;
1500	struct fwnet_device *dev;
1501	unsigned max_mtu;
1502	int ret;
1503
1504	mutex_lock(&fwnet_device_mutex);
1505
1506	dev = fwnet_dev_find(card);
1507	if (dev) {
1508	net = dev->netdev;
1509	goto have_dev;
1510	}
1511
1512	net = alloc_netdev(sizeof(*dev), "firewire%d", fwnet_init_dev);
1513	if (net == NULL) {
1514	ret = -ENOMEM;
1515	goto out;
1516	}
1517
1518	allocated_netdev = true;
1519	SET_NETDEV_DEV(net, card->device);
1520	dev = netdev_priv(net);
1521
1522	spin_lock_init(&dev->lock);
1523	dev->broadcast_state = FWNET_BROADCAST_ERROR;
1524	dev->broadcast_rcv_context = NULL;
1525	dev->broadcast_xmt_max_payload = 0;
1526	dev->broadcast_xmt_datagramlabel = 0;
1527	dev->local_fifo = FWNET_NO_FIFO_ADDR;
1528	dev->queued_datagrams = 0;
1529	INIT_LIST_HEAD(&dev->peer_list);
1530	dev->card = card;
1531	dev->netdev = net;
1532
1533	/*
1534	* Use the RFC 2734 default 1500 octets or the maximum payload
1535	* as initial MTU
1536	*/
1537	max_mtu = (1 << (card->max_receive + 1))
1538	- sizeof(struct rfc2734_header) - IEEE1394_GASP_HDR_SIZE;
1539	net->mtu = min(1500U, max_mtu);
1540
1541	/* Set our hardware address while we're at it */
1542	put_unaligned_be64(card->guid, net->dev_addr);
1543	put_unaligned_be64(~0ULL, net->broadcast);
1544	ret = register_netdev(net);
1545	if (ret)
1546	goto out;
1547
1548	list_add_tail(&dev->dev_link, &fwnet_device_list);
1549	dev_notice(&net->dev, "IPv4 over IEEE 1394 on card %s\n",
1550	dev_name(card->device));
1551	have_dev:
1552	ret = fwnet_add_peer(dev, unit, device);
1553	if (ret && allocated_netdev) {
1554	unregister_netdev(net);
1555	list_del(&dev->dev_link);
1556	}
1557	out:
1558	if (ret && allocated_netdev)
1559	free_netdev(net);
1560
1561	mutex_unlock(&fwnet_device_mutex);
1562
1563	return ret;
1564	}
1565
1566	static void fwnet_remove_peer(struct fwnet_peer peer, struct fwnet_device dev)
1567	{
1568	struct fwnet_partial_datagram pd, pd_next;
1569
1570	spin_lock_irq(&dev->lock);
1571	list_del(&peer->peer_link);
1572	dev->peer_count--;
1573	set_carrier_state(dev);
1574	spin_unlock_irq(&dev->lock);
1575
1576	list_for_each_entry_safe(pd, pd_next, &peer->pd_list, pd_link)
1577	fwnet_pd_delete(pd);
1578
1579	kfree(peer);
1580	}
1581
1582	static int fwnet_remove(struct device *_dev)
1583	{
1584	struct fwnet_peer *peer = dev_get_drvdata(_dev);
1585	struct fwnet_device *dev = peer->dev;
1586	struct net_device *net;
1587	int i;
1588
1589	mutex_lock(&fwnet_device_mutex);
1590
1591	net = dev->netdev;
1592	if (net && peer->ip)
1593	arp_invalidate(net, peer->ip);
1594
1595	fwnet_remove_peer(peer, dev);
1596
1597	if (list_empty(&dev->peer_list)) {
1598	unregister_netdev(net);
1599
1600	if (dev->local_fifo != FWNET_NO_FIFO_ADDR)
1601	fw_core_remove_address_handler(&dev->handler);
1602	if (dev->broadcast_rcv_context) {
1603	fw_iso_context_stop(dev->broadcast_rcv_context);
1604	fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer,
1605	dev->card);
1606	fw_iso_context_destroy(dev->broadcast_rcv_context);
1607	}
1608	for (i = 0; dev->queued_datagrams && i < 5; i++)
1609	ssleep(1);
1610	WARN_ON(dev->queued_datagrams);
1611	list_del(&dev->dev_link);
1612
1613	free_netdev(net);
1614	}
1615
1616	mutex_unlock(&fwnet_device_mutex);
1617
1618	return 0;
1619	}
1620
1621	/*
1622	* FIXME abort partially sent fragmented datagrams,
1623	* discard partially received fragmented datagrams
1624	*/
1625	static void fwnet_update(struct fw_unit *unit)
1626	{
1627	struct fw_device *device = fw_parent_device(unit);
1628	struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1629	int generation;
1630
1631	generation = device->generation;
1632
1633	spin_lock_irq(&peer->dev->lock);
1634	peer->node_id = device->node_id;
1635	peer->generation = generation;
1636	spin_unlock_irq(&peer->dev->lock);
1637	}
1638
1639	static const struct ieee1394_device_id fwnet_id_table[] = {
1640	{
1641	.match_flags = IEEE1394_MATCH_SPECIFIER_ID \|
1642	IEEE1394_MATCH_VERSION,
1643	.specifier_id = IANA_SPECIFIER_ID,
1644	.version = RFC2734_SW_VERSION,
1645	},
1646	{ }
1647	};
1648
1649	static struct fw_driver fwnet_driver = {
1650	.driver = {
1651	.owner = THIS_MODULE,
1652	.name = KBUILD_MODNAME,
1653	.bus = &fw_bus_type,
1654	.probe = fwnet_probe,
1655	.remove = fwnet_remove,
1656	},
1657	.update = fwnet_update,
1658	.id_table = fwnet_id_table,
1659	};
1660
1661	static const u32 rfc2374_unit_directory_data[] = {
1662	0x00040000, /* directory_length */
1663	0x1200005e, /* unit_specifier_id: IANA */
1664	0x81000003, /* textual descriptor offset */
1665	0x13000001, /* unit_sw_version: RFC 2734 */
1666	0x81000005, /* textual descriptor offset */
1667	0x00030000, /* descriptor_length */
1668	0x00000000, /* text */
1669	0x00000000, /* minimal ASCII, en */
1670	0x49414e41, /* I A N A */
1671	0x00030000, /* descriptor_length */
1672	0x00000000, /* text */
1673	0x00000000, /* minimal ASCII, en */
1674	0x49507634, /* I P v 4 */
1675	};
1676
1677	static struct fw_descriptor rfc2374_unit_directory = {
1678	.length = ARRAY_SIZE(rfc2374_unit_directory_data),
1679	.key = (CSR_DIRECTORY \| CSR_UNIT) << 24,
1680	.data = rfc2374_unit_directory_data
1681	};
1682
1683	static int __init fwnet_init(void)
1684	{
1685	int err;
1686
1687	err = fw_core_add_descriptor(&rfc2374_unit_directory);
1688	if (err)
1689	return err;
1690
1691	fwnet_packet_task_cache = kmem_cache_create("packet_task",
1692	sizeof(struct fwnet_packet_task), 0, 0, NULL);
1693	if (!fwnet_packet_task_cache) {
1694	err = -ENOMEM;
1695	goto out;
1696	}
1697
1698	err = driver_register(&fwnet_driver.driver);
1699	if (!err)
1700	return 0;
1701
1702	kmem_cache_destroy(fwnet_packet_task_cache);
1703	out:
1704	fw_core_remove_descriptor(&rfc2374_unit_directory);
1705
1706	return err;
1707	}
1708	module_init(fwnet_init);
1709
1710	static void __exit fwnet_cleanup(void)
1711	{
1712	driver_unregister(&fwnet_driver.driver);
1713	kmem_cache_destroy(fwnet_packet_task_cache);
1714	fw_core_remove_descriptor(&rfc2374_unit_directory);
1715	}
1716	module_exit(fwnet_cleanup);
1717
1718	MODULE_AUTHOR("Jay Fenlason <fenlason@redhat.com>");
1719	MODULE_DESCRIPTION("IPv4 over IEEE1394 as per RFC 2734");
1720	MODULE_LICENSE("GPL");
1721	MODULE_DEVICE_TABLE(ieee1394, fwnet_id_table);
1722

Download this file

Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master

Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9

Kernel

Kernel Git Source Tree

Root/drivers/firewire/net.c

interactive