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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);
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
62struct 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
82struct 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 */
88struct 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
106static 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
113static 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
122static 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 */
132struct fwnet_fragment_info {
133 struct list_head fi_link;
134 u16 offset;
135 u16 len;
136};
137
138struct 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
149static DEFINE_MUTEX(fwnet_device_mutex);
150static LIST_HEAD(fwnet_device_list);
151
152struct 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
190struct 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. */
209struct 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 */
228static int fwnet_header_create(struct sk_buff *skb, struct net_device *net,
229 unsigned short type, const void *daddr,
230 const void *saddr, unsigned len)
231{
232 struct fwnet_header *h;
233
234 h = (struct fwnet_header *)skb_push(skb, sizeof(*h));
235 put_unaligned_be16(type, &h->h_proto);
236
237 if (net->flags & (IFF_LOOPBACK | IFF_NOARP)) {
238 memset(h->h_dest, 0, net->addr_len);
239
240 return net->hard_header_len;
241 }
242
243 if (daddr) {
244 memcpy(h->h_dest, daddr, net->addr_len);
245
246 return net->hard_header_len;
247 }
248
249 return -net->hard_header_len;
250}
251
252static int fwnet_header_rebuild(struct sk_buff *skb)
253{
254 struct fwnet_header *h = (struct fwnet_header *)skb->data;
255
256 if (get_unaligned_be16(&h->h_proto) == ETH_P_IP)
257 return arp_find((unsigned char *)&h->h_dest, skb);
258
259 fw_notify("%s: unable to resolve type %04x addresses\n",
260 skb->dev->name, be16_to_cpu(h->h_proto));
261 return 0;
262}
263
264static int fwnet_header_cache(const struct neighbour *neigh,
265 struct hh_cache *hh, __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. */
282static void fwnet_header_cache_update(struct hh_cache *hh,
283 const struct net_device *net, const unsigned char *haddr)
284{
285 memcpy((u8 *)hh->hh_data + 16 - FWNET_HLEN, haddr, net->addr_len);
286}
287
288static int fwnet_header_parse(const struct sk_buff *skb, unsigned char *haddr)
289{
290 memcpy(haddr, skb->dev->dev_addr, FWNET_ALEN);
291
292 return FWNET_ALEN;
293}
294
295static const struct header_ops fwnet_header_ops = {
296 .create = fwnet_header_create,
297 .rebuild = fwnet_header_rebuild,
298 .cache = fwnet_header_cache,
299 .cache_update = fwnet_header_cache_update,
300 .parse = fwnet_header_parse,
301};
302
303/* FIXME: is this correct for all cases? */
304static 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 */
318static 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 fw_error("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
383static 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
412fail_w_fi:
413 kfree(fi);
414fail_w_new:
415 kfree(new);
416fail:
417 fw_error("out of memory\n");
418
419 return NULL;
420}
421
422static 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
435static 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
447static 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
465static 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 */
475static 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 */
488static 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. */
502static unsigned fwnet_max_payload(unsigned max_rec, unsigned speed)
503{
504 max_rec = min(max_rec, speed + 8);
505 max_rec = min(max_rec, 0xbU); /* <= 4096 */
506 if (max_rec < 8) {
507 fw_notify("max_rec %x out of range\n", max_rec);
508 max_rec = 8;
509 }
510
511 return (1 << (max_rec + 1)) - RFC2374_FRAG_HDR_SIZE;
512}
513
514
515static int fwnet_finish_incoming_packet(struct net_device *net,
516 struct sk_buff *skb, u16 source_node_id,
517 bool is_broadcast, u16 ether_type)
518{
519 struct fwnet_device *dev;
520 static const __be64 broadcast_hw = cpu_to_be64(~0ULL);
521 int status;
522 __be64 guid;
523
524 dev = netdev_priv(net);
525 /* Write metadata, and then pass to the receive level */
526 skb->dev = net;
527 skb->ip_summed = CHECKSUM_UNNECESSARY; /* don't check it */
528
529 /*
530 * Parse the encapsulation header. This actually does the job of
531 * converting to an ethernet frame header, as well as arp
532 * conversion if needed. ARP conversion is easier in this
533 * direction, since we are using ethernet as our backend.
534 */
535 /*
536 * If this is an ARP packet, convert it. First, we want to make
537 * use of some of the fields, since they tell us a little bit
538 * about the sending machine.
539 */
540 if (ether_type == ETH_P_ARP) {
541 struct rfc2734_arp *arp1394;
542 struct arphdr *arp;
543 unsigned char *arp_ptr;
544 u64 fifo_addr;
545 u64 peer_guid;
546 unsigned sspd;
547 u16 max_payload;
548 struct fwnet_peer *peer;
549 unsigned long flags;
550
551 arp1394 = (struct rfc2734_arp *)skb->data;
552 arp = (struct arphdr *)skb->data;
553 arp_ptr = (unsigned char *)(arp + 1);
554 peer_guid = get_unaligned_be64(&arp1394->s_uniq_id);
555 fifo_addr = (u64)get_unaligned_be16(&arp1394->fifo_hi) << 32
556 | get_unaligned_be32(&arp1394->fifo_lo);
557
558 sspd = arp1394->sspd;
559 /* Sanity check. OS X 10.3 PPC reportedly sends 131. */
560 if (sspd > SCODE_3200) {
561 fw_notify("sspd %x out of range\n", sspd);
562 sspd = SCODE_3200;
563 }
564 max_payload = fwnet_max_payload(arp1394->max_rec, sspd);
565
566 spin_lock_irqsave(&dev->lock, flags);
567 peer = fwnet_peer_find_by_guid(dev, peer_guid);
568 if (peer) {
569 peer->fifo = fifo_addr;
570
571 if (peer->speed > sspd)
572 peer->speed = sspd;
573 if (peer->max_payload > max_payload)
574 peer->max_payload = max_payload;
575
576 peer->ip = arp1394->sip;
577 }
578 spin_unlock_irqrestore(&dev->lock, flags);
579
580 if (!peer) {
581 fw_notify("No peer for ARP packet from %016llx\n",
582 (unsigned long long)peer_guid);
583 goto no_peer;
584 }
585
586 /*
587 * Now that we're done with the 1394 specific stuff, we'll
588 * need to alter some of the data. Believe it or not, all
589 * that needs to be done is sender_IP_address needs to be
590 * moved, the destination hardware address get stuffed
591 * in and the hardware address length set to 8.
592 *
593 * IMPORTANT: The code below overwrites 1394 specific data
594 * needed above so keep the munging of the data for the
595 * higher level IP stack last.
596 */
597
598 arp->ar_hln = 8;
599 /* skip over sender unique id */
600 arp_ptr += arp->ar_hln;
601 /* move sender IP addr */
602 put_unaligned(arp1394->sip, (u32 *)arp_ptr);
603 /* skip over sender IP addr */
604 arp_ptr += arp->ar_pln;
605
606 if (arp->ar_op == htons(ARPOP_REQUEST))
607 memset(arp_ptr, 0, sizeof(u64));
608 else
609 memcpy(arp_ptr, net->dev_addr, sizeof(u64));
610 }
611
612 /* Now add the ethernet header. */
613 guid = cpu_to_be64(dev->card->guid);
614 if (dev_hard_header(skb, net, ether_type,
615 is_broadcast ? &broadcast_hw : &guid,
616 NULL, skb->len) >= 0) {
617 struct fwnet_header *eth;
618 u16 *rawp;
619 __be16 protocol;
620
621 skb_reset_mac_header(skb);
622 skb_pull(skb, sizeof(*eth));
623 eth = (struct fwnet_header *)skb_mac_header(skb);
624 if (*eth->h_dest & 1) {
625 if (memcmp(eth->h_dest, net->broadcast,
626 net->addr_len) == 0)
627 skb->pkt_type = PACKET_BROADCAST;
628#if 0
629 else
630 skb->pkt_type = PACKET_MULTICAST;
631#endif
632 } else {
633 if (memcmp(eth->h_dest, net->dev_addr, net->addr_len))
634 skb->pkt_type = PACKET_OTHERHOST;
635 }
636 if (ntohs(eth->h_proto) >= 1536) {
637 protocol = eth->h_proto;
638 } else {
639 rawp = (u16 *)skb->data;
640 if (*rawp == 0xffff)
641 protocol = htons(ETH_P_802_3);
642 else
643 protocol = htons(ETH_P_802_2);
644 }
645 skb->protocol = protocol;
646 }
647 status = netif_rx(skb);
648 if (status == NET_RX_DROP) {
649 net->stats.rx_errors++;
650 net->stats.rx_dropped++;
651 } else {
652 net->stats.rx_packets++;
653 net->stats.rx_bytes += skb->len;
654 }
655
656 return 0;
657
658 no_peer:
659 net->stats.rx_errors++;
660 net->stats.rx_dropped++;
661
662 dev_kfree_skb_any(skb);
663
664 return -ENOENT;
665}
666
667static int fwnet_incoming_packet(struct fwnet_device *dev, __be32 *buf, int len,
668 int source_node_id, int generation,
669 bool is_broadcast)
670{
671 struct sk_buff *skb;
672 struct net_device *net = dev->netdev;
673 struct rfc2734_header hdr;
674 unsigned lf;
675 unsigned long flags;
676 struct fwnet_peer *peer;
677 struct fwnet_partial_datagram *pd;
678 int fg_off;
679 int dg_size;
680 u16 datagram_label;
681 int retval;
682 u16 ether_type;
683
684 hdr.w0 = be32_to_cpu(buf[0]);
685 lf = fwnet_get_hdr_lf(&hdr);
686 if (lf == RFC2374_HDR_UNFRAG) {
687 /*
688 * An unfragmented datagram has been received by the ieee1394
689 * bus. Build an skbuff around it so we can pass it to the
690 * high level network layer.
691 */
692 ether_type = fwnet_get_hdr_ether_type(&hdr);
693 buf++;
694 len -= RFC2374_UNFRAG_HDR_SIZE;
695
696 skb = dev_alloc_skb(len + net->hard_header_len + 15);
697 if (unlikely(!skb)) {
698 fw_error("out of memory\n");
699 net->stats.rx_dropped++;
700
701 return -ENOMEM;
702 }
703 skb_reserve(skb, (net->hard_header_len + 15) & ~15);
704 memcpy(skb_put(skb, len), buf, len);
705
706 return fwnet_finish_incoming_packet(net, skb, source_node_id,
707 is_broadcast, ether_type);
708 }
709 /* A datagram fragment has been received, now the fun begins. */
710 hdr.w1 = ntohl(buf[1]);
711 buf += 2;
712 len -= RFC2374_FRAG_HDR_SIZE;
713 if (lf == RFC2374_HDR_FIRSTFRAG) {
714 ether_type = fwnet_get_hdr_ether_type(&hdr);
715 fg_off = 0;
716 } else {
717 ether_type = 0;
718 fg_off = fwnet_get_hdr_fg_off(&hdr);
719 }
720 datagram_label = fwnet_get_hdr_dgl(&hdr);
721 dg_size = fwnet_get_hdr_dg_size(&hdr); /* ??? + 1 */
722
723 spin_lock_irqsave(&dev->lock, flags);
724
725 peer = fwnet_peer_find_by_node_id(dev, source_node_id, generation);
726 if (!peer) {
727 retval = -ENOENT;
728 goto fail;
729 }
730
731 pd = fwnet_pd_find(peer, datagram_label);
732 if (pd == NULL) {
733 while (peer->pdg_size >= FWNET_MAX_FRAGMENTS) {
734 /* remove the oldest */
735 fwnet_pd_delete(list_first_entry(&peer->pd_list,
736 struct fwnet_partial_datagram, pd_link));
737 peer->pdg_size--;
738 }
739 pd = fwnet_pd_new(net, peer, datagram_label,
740 dg_size, buf, fg_off, len);
741 if (pd == NULL) {
742 retval = -ENOMEM;
743 goto fail;
744 }
745 peer->pdg_size++;
746 } else {
747 if (fwnet_frag_overlap(pd, fg_off, len) ||
748 pd->datagram_size != dg_size) {
749 /*
750 * Differing datagram sizes or overlapping fragments,
751 * discard old datagram and start a new one.
752 */
753 fwnet_pd_delete(pd);
754 pd = fwnet_pd_new(net, peer, datagram_label,
755 dg_size, buf, fg_off, len);
756 if (pd == NULL) {
757 peer->pdg_size--;
758 retval = -ENOMEM;
759 goto fail;
760 }
761 } else {
762 if (!fwnet_pd_update(peer, pd, buf, fg_off, len)) {
763 /*
764 * Couldn't save off fragment anyway
765 * so might as well obliterate the
766 * datagram now.
767 */
768 fwnet_pd_delete(pd);
769 peer->pdg_size--;
770 retval = -ENOMEM;
771 goto fail;
772 }
773 }
774 } /* new datagram or add to existing one */
775
776 if (lf == RFC2374_HDR_FIRSTFRAG)
777 pd->ether_type = ether_type;
778
779 if (fwnet_pd_is_complete(pd)) {
780 ether_type = pd->ether_type;
781 peer->pdg_size--;
782 skb = skb_get(pd->skb);
783 fwnet_pd_delete(pd);
784
785 spin_unlock_irqrestore(&dev->lock, flags);
786
787 return fwnet_finish_incoming_packet(net, skb, source_node_id,
788 false, ether_type);
789 }
790 /*
791 * Datagram is not complete, we're done for the
792 * moment.
793 */
794 retval = 0;
795 fail:
796 spin_unlock_irqrestore(&dev->lock, flags);
797
798 return retval;
799}
800
801static void fwnet_receive_packet(struct fw_card *card, struct fw_request *r,
802 int tcode, int destination, int source, int generation,
803 unsigned long long offset, void *payload, size_t length,
804 void *callback_data)
805{
806 struct fwnet_device *dev = callback_data;
807 int rcode;
808
809 if (destination == IEEE1394_ALL_NODES) {
810 kfree(r);
811
812 return;
813 }
814
815 if (offset != dev->handler.offset)
816 rcode = RCODE_ADDRESS_ERROR;
817 else if (tcode != TCODE_WRITE_BLOCK_REQUEST)
818 rcode = RCODE_TYPE_ERROR;
819 else if (fwnet_incoming_packet(dev, payload, length,
820 source, generation, false) != 0) {
821 fw_error("Incoming packet failure\n");
822 rcode = RCODE_CONFLICT_ERROR;
823 } else
824 rcode = RCODE_COMPLETE;
825
826 fw_send_response(card, r, rcode);
827}
828
829static void fwnet_receive_broadcast(struct fw_iso_context *context,
830 u32 cycle, size_t header_length, void *header, void *data)
831{
832 struct fwnet_device *dev;
833 struct fw_iso_packet packet;
834 struct fw_card *card;
835 __be16 *hdr_ptr;
836 __be32 *buf_ptr;
837 int retval;
838 u32 length;
839 u16 source_node_id;
840 u32 specifier_id;
841 u32 ver;
842 unsigned long offset;
843 unsigned long flags;
844
845 dev = data;
846 card = dev->card;
847 hdr_ptr = header;
848 length = be16_to_cpup(hdr_ptr);
849
850 spin_lock_irqsave(&dev->lock, flags);
851
852 offset = dev->rcv_buffer_size * dev->broadcast_rcv_next_ptr;
853 buf_ptr = dev->broadcast_rcv_buffer_ptrs[dev->broadcast_rcv_next_ptr++];
854 if (dev->broadcast_rcv_next_ptr == dev->num_broadcast_rcv_ptrs)
855 dev->broadcast_rcv_next_ptr = 0;
856
857 spin_unlock_irqrestore(&dev->lock, flags);
858
859 specifier_id = (be32_to_cpu(buf_ptr[0]) & 0xffff) << 8
860 | (be32_to_cpu(buf_ptr[1]) & 0xff000000) >> 24;
861 ver = be32_to_cpu(buf_ptr[1]) & 0xffffff;
862 source_node_id = be32_to_cpu(buf_ptr[0]) >> 16;
863
864 if (specifier_id == IANA_SPECIFIER_ID && ver == RFC2734_SW_VERSION) {
865 buf_ptr += 2;
866 length -= IEEE1394_GASP_HDR_SIZE;
867 fwnet_incoming_packet(dev, buf_ptr, length,
868 source_node_id, -1, true);
869 }
870
871 packet.payload_length = dev->rcv_buffer_size;
872 packet.interrupt = 1;
873 packet.skip = 0;
874 packet.tag = 3;
875 packet.sy = 0;
876 packet.header_length = IEEE1394_GASP_HDR_SIZE;
877
878 spin_lock_irqsave(&dev->lock, flags);
879
880 retval = fw_iso_context_queue(dev->broadcast_rcv_context, &packet,
881 &dev->broadcast_rcv_buffer, offset);
882
883 spin_unlock_irqrestore(&dev->lock, flags);
884
885 if (retval >= 0)
886 fw_iso_context_queue_flush(dev->broadcast_rcv_context);
887 else
888 fw_error("requeue failed\n");
889}
890
891static struct kmem_cache *fwnet_packet_task_cache;
892
893static void fwnet_free_ptask(struct fwnet_packet_task *ptask)
894{
895 dev_kfree_skb_any(ptask->skb);
896 kmem_cache_free(fwnet_packet_task_cache, ptask);
897}
898
899/* Caller must hold dev->lock. */
900static void dec_queued_datagrams(struct fwnet_device *dev)
901{
902 if (--dev->queued_datagrams == FWNET_MIN_QUEUED_DATAGRAMS)
903 netif_wake_queue(dev->netdev);
904}
905
906static int fwnet_send_packet(struct fwnet_packet_task *ptask);
907
908static void fwnet_transmit_packet_done(struct fwnet_packet_task *ptask)
909{
910 struct fwnet_device *dev = ptask->dev;
911 struct sk_buff *skb = ptask->skb;
912 unsigned long flags;
913 bool free;
914
915 spin_lock_irqsave(&dev->lock, flags);
916
917 ptask->outstanding_pkts--;
918
919 /* Check whether we or the networking TX soft-IRQ is last user. */
920 free = (ptask->outstanding_pkts == 0 && ptask->enqueued);
921 if (free)
922 dec_queued_datagrams(dev);
923
924 if (ptask->outstanding_pkts == 0) {
925 dev->netdev->stats.tx_packets++;
926 dev->netdev->stats.tx_bytes += skb->len;
927 }
928
929 spin_unlock_irqrestore(&dev->lock, flags);
930
931 if (ptask->outstanding_pkts > 0) {
932 u16 dg_size;
933 u16 fg_off;
934 u16 datagram_label;
935 u16 lf;
936
937 /* Update the ptask to point to the next fragment and send it */
938 lf = fwnet_get_hdr_lf(&ptask->hdr);
939 switch (lf) {
940 case RFC2374_HDR_LASTFRAG:
941 case RFC2374_HDR_UNFRAG:
942 default:
943 fw_error("Outstanding packet %x lf %x, header %x,%x\n",
944 ptask->outstanding_pkts, lf, ptask->hdr.w0,
945 ptask->hdr.w1);
946 BUG();
947
948 case RFC2374_HDR_FIRSTFRAG:
949 /* Set frag type here for future interior fragments */
950 dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
951 fg_off = ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
952 datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
953 break;
954
955 case RFC2374_HDR_INTFRAG:
956 dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
957 fg_off = fwnet_get_hdr_fg_off(&ptask->hdr)
958 + ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
959 datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
960 break;
961 }
962
963 skb_pull(skb, ptask->max_payload);
964 if (ptask->outstanding_pkts > 1) {
965 fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_INTFRAG,
966 dg_size, fg_off, datagram_label);
967 } else {
968 fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_LASTFRAG,
969 dg_size, fg_off, datagram_label);
970 ptask->max_payload = skb->len + RFC2374_FRAG_HDR_SIZE;
971 }
972 fwnet_send_packet(ptask);
973 }
974
975 if (free)
976 fwnet_free_ptask(ptask);
977}
978
979static void fwnet_transmit_packet_failed(struct fwnet_packet_task *ptask)
980{
981 struct fwnet_device *dev = ptask->dev;
982 unsigned long flags;
983 bool free;
984
985 spin_lock_irqsave(&dev->lock, flags);
986
987 /* One fragment failed; don't try to send remaining fragments. */
988 ptask->outstanding_pkts = 0;
989
990 /* Check whether we or the networking TX soft-IRQ is last user. */
991 free = ptask->enqueued;
992 if (free)
993 dec_queued_datagrams(dev);
994
995 dev->netdev->stats.tx_dropped++;
996 dev->netdev->stats.tx_errors++;
997
998 spin_unlock_irqrestore(&dev->lock, flags);
999
1000 if (free)
1001 fwnet_free_ptask(ptask);
1002}
1003
1004static void fwnet_write_complete(struct fw_card *card, int rcode,
1005 void *payload, size_t length, void *data)
1006{
1007 struct fwnet_packet_task *ptask = data;
1008 static unsigned long j;
1009 static int last_rcode, errors_skipped;
1010
1011 if (rcode == RCODE_COMPLETE) {
1012 fwnet_transmit_packet_done(ptask);
1013 } else {
1014 fwnet_transmit_packet_failed(ptask);
1015
1016 if (printk_timed_ratelimit(&j, 1000) || rcode != last_rcode) {
1017 fw_error("fwnet_write_complete: "
1018 "failed: %x (skipped %d)\n", rcode, errors_skipped);
1019
1020 errors_skipped = 0;
1021 last_rcode = rcode;
1022 } else
1023 errors_skipped++;
1024 }
1025}
1026
1027static int fwnet_send_packet(struct fwnet_packet_task *ptask)
1028{
1029 struct fwnet_device *dev;
1030 unsigned tx_len;
1031 struct rfc2734_header *bufhdr;
1032 unsigned long flags;
1033 bool free;
1034
1035 dev = ptask->dev;
1036 tx_len = ptask->max_payload;
1037 switch (fwnet_get_hdr_lf(&ptask->hdr)) {
1038 case RFC2374_HDR_UNFRAG:
1039 bufhdr = (struct rfc2734_header *)
1040 skb_push(ptask->skb, RFC2374_UNFRAG_HDR_SIZE);
1041 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
1042 break;
1043
1044 case RFC2374_HDR_FIRSTFRAG:
1045 case RFC2374_HDR_INTFRAG:
1046 case RFC2374_HDR_LASTFRAG:
1047 bufhdr = (struct rfc2734_header *)
1048 skb_push(ptask->skb, RFC2374_FRAG_HDR_SIZE);
1049 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
1050 put_unaligned_be32(ptask->hdr.w1, &bufhdr->w1);
1051 break;
1052
1053 default:
1054 BUG();
1055 }
1056 if (ptask->dest_node == IEEE1394_ALL_NODES) {
1057 u8 *p;
1058 int generation;
1059 int node_id;
1060
1061 /* ptask->generation may not have been set yet */
1062 generation = dev->card->generation;
1063 smp_rmb();
1064 node_id = dev->card->node_id;
1065
1066 p = skb_push(ptask->skb, 8);
1067 put_unaligned_be32(node_id << 16 | IANA_SPECIFIER_ID >> 8, p);
1068 put_unaligned_be32((IANA_SPECIFIER_ID & 0xff) << 24
1069 | RFC2734_SW_VERSION, &p[4]);
1070
1071 /* We should not transmit if broadcast_channel.valid == 0. */
1072 fw_send_request(dev->card, &ptask->transaction,
1073 TCODE_STREAM_DATA,
1074 fw_stream_packet_destination_id(3,
1075 IEEE1394_BROADCAST_CHANNEL, 0),
1076 generation, SCODE_100, 0ULL, ptask->skb->data,
1077 tx_len + 8, fwnet_write_complete, ptask);
1078
1079 spin_lock_irqsave(&dev->lock, flags);
1080
1081 /* If the AT tasklet already ran, we may be last user. */
1082 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1083 if (!free)
1084 ptask->enqueued = true;
1085 else
1086 dec_queued_datagrams(dev);
1087
1088 spin_unlock_irqrestore(&dev->lock, flags);
1089
1090 goto out;
1091 }
1092
1093 fw_send_request(dev->card, &ptask->transaction,
1094 TCODE_WRITE_BLOCK_REQUEST, ptask->dest_node,
1095 ptask->generation, ptask->speed, ptask->fifo_addr,
1096 ptask->skb->data, tx_len, fwnet_write_complete, ptask);
1097
1098 spin_lock_irqsave(&dev->lock, flags);
1099
1100 /* If the AT tasklet already ran, we may be last user. */
1101 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1102 if (!free)
1103 ptask->enqueued = true;
1104 else
1105 dec_queued_datagrams(dev);
1106
1107 spin_unlock_irqrestore(&dev->lock, flags);
1108
1109 dev->netdev->trans_start = jiffies;
1110 out:
1111 if (free)
1112 fwnet_free_ptask(ptask);
1113
1114 return 0;
1115}
1116
1117static int fwnet_broadcast_start(struct fwnet_device *dev)
1118{
1119 struct fw_iso_context *context;
1120 int retval;
1121 unsigned num_packets;
1122 unsigned max_receive;
1123 struct fw_iso_packet packet;
1124 unsigned long offset;
1125 unsigned u;
1126
1127 if (dev->local_fifo == FWNET_NO_FIFO_ADDR) {
1128 /* outside OHCI posted write area? */
1129 static const struct fw_address_region region = {
1130 .start = 0xffff00000000ULL,
1131 .end = CSR_REGISTER_BASE,
1132 };
1133
1134 dev->handler.length = 4096;
1135 dev->handler.address_callback = fwnet_receive_packet;
1136 dev->handler.callback_data = dev;
1137
1138 retval = fw_core_add_address_handler(&dev->handler, ®ion);
1139 if (retval < 0)
1140 goto failed_initial;
1141
1142 dev->local_fifo = dev->handler.offset;
1143 }
1144
1145 max_receive = 1U << (dev->card->max_receive + 1);
1146 num_packets = (FWNET_ISO_PAGE_COUNT * PAGE_SIZE) / max_receive;
1147
1148 if (!dev->broadcast_rcv_context) {
1149 void **ptrptr;
1150
1151 context = fw_iso_context_create(dev->card,
1152 FW_ISO_CONTEXT_RECEIVE, IEEE1394_BROADCAST_CHANNEL,
1153 dev->card->link_speed, 8, fwnet_receive_broadcast, dev);
1154 if (IS_ERR(context)) {
1155 retval = PTR_ERR(context);
1156 goto failed_context_create;
1157 }
1158
1159 retval = fw_iso_buffer_init(&dev->broadcast_rcv_buffer,
1160 dev->card, FWNET_ISO_PAGE_COUNT, DMA_FROM_DEVICE);
1161 if (retval < 0)
1162 goto failed_buffer_init;
1163
1164 ptrptr = kmalloc(sizeof(void *) * num_packets, GFP_KERNEL);
1165 if (!ptrptr) {
1166 retval = -ENOMEM;
1167 goto failed_ptrs_alloc;
1168 }
1169
1170 dev->broadcast_rcv_buffer_ptrs = ptrptr;
1171 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++) {
1172 void *ptr;
1173 unsigned v;
1174
1175 ptr = kmap(dev->broadcast_rcv_buffer.pages[u]);
1176 for (v = 0; v < num_packets / FWNET_ISO_PAGE_COUNT; v++)
1177 *ptrptr++ = (void *)
1178 ((char *)ptr + v * max_receive);
1179 }
1180 dev->broadcast_rcv_context = context;
1181 } else {
1182 context = dev->broadcast_rcv_context;
1183 }
1184
1185 packet.payload_length = max_receive;
1186 packet.interrupt = 1;
1187 packet.skip = 0;
1188 packet.tag = 3;
1189 packet.sy = 0;
1190 packet.header_length = IEEE1394_GASP_HDR_SIZE;
1191 offset = 0;
1192
1193 for (u = 0; u < num_packets; u++) {
1194 retval = fw_iso_context_queue(context, &packet,
1195 &dev->broadcast_rcv_buffer, offset);
1196 if (retval < 0)
1197 goto failed_rcv_queue;
1198
1199 offset += max_receive;
1200 }
1201 dev->num_broadcast_rcv_ptrs = num_packets;
1202 dev->rcv_buffer_size = max_receive;
1203 dev->broadcast_rcv_next_ptr = 0U;
1204 retval = fw_iso_context_start(context, -1, 0,
1205 FW_ISO_CONTEXT_MATCH_ALL_TAGS); /* ??? sync */
1206 if (retval < 0)
1207 goto failed_rcv_queue;
1208
1209 /* FIXME: adjust it according to the min. speed of all known peers? */
1210 dev->broadcast_xmt_max_payload = IEEE1394_MAX_PAYLOAD_S100
1211 - IEEE1394_GASP_HDR_SIZE - RFC2374_UNFRAG_HDR_SIZE;
1212 dev->broadcast_state = FWNET_BROADCAST_RUNNING;
1213
1214 return 0;
1215
1216 failed_rcv_queue:
1217 kfree(dev->broadcast_rcv_buffer_ptrs);
1218 dev->broadcast_rcv_buffer_ptrs = NULL;
1219 failed_ptrs_alloc:
1220 fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer, dev->card);
1221 failed_buffer_init:
1222 fw_iso_context_destroy(context);
1223 dev->broadcast_rcv_context = NULL;
1224 failed_context_create:
1225 fw_core_remove_address_handler(&dev->handler);
1226 failed_initial:
1227 dev->local_fifo = FWNET_NO_FIFO_ADDR;
1228
1229 return retval;
1230}
1231
1232static void set_carrier_state(struct fwnet_device *dev)
1233{
1234 if (dev->peer_count > 1)
1235 netif_carrier_on(dev->netdev);
1236 else
1237 netif_carrier_off(dev->netdev);
1238}
1239
1240/* ifup */
1241static int fwnet_open(struct net_device *net)
1242{
1243 struct fwnet_device *dev = netdev_priv(net);
1244 int ret;
1245
1246 if (dev->broadcast_state == FWNET_BROADCAST_ERROR) {
1247 ret = fwnet_broadcast_start(dev);
1248 if (ret)
1249 return ret;
1250 }
1251 netif_start_queue(net);
1252
1253 spin_lock_irq(&dev->lock);
1254 set_carrier_state(dev);
1255 spin_unlock_irq(&dev->lock);
1256
1257 return 0;
1258}
1259
1260/* ifdown */
1261static int fwnet_stop(struct net_device *net)
1262{
1263 netif_stop_queue(net);
1264
1265 /* Deallocate iso context for use by other applications? */
1266
1267 return 0;
1268}
1269
1270static netdev_tx_t fwnet_tx(struct sk_buff *skb, struct net_device *net)
1271{
1272 struct fwnet_header hdr_buf;
1273 struct fwnet_device *dev = netdev_priv(net);
1274 __be16 proto;
1275 u16 dest_node;
1276 unsigned max_payload;
1277 u16 dg_size;
1278 u16 *datagram_label_ptr;
1279 struct fwnet_packet_task *ptask;
1280 struct fwnet_peer *peer;
1281 unsigned long flags;
1282
1283 spin_lock_irqsave(&dev->lock, flags);
1284
1285 /* Can this happen? */
1286 if (netif_queue_stopped(dev->netdev)) {
1287 spin_unlock_irqrestore(&dev->lock, flags);
1288
1289 return NETDEV_TX_BUSY;
1290 }
1291
1292 ptask = kmem_cache_alloc(fwnet_packet_task_cache, GFP_ATOMIC);
1293 if (ptask == NULL)
1294 goto fail;
1295
1296 skb = skb_share_check(skb, GFP_ATOMIC);
1297 if (!skb)
1298 goto fail;
1299
1300 /*
1301 * Make a copy of the driver-specific header.
1302 * We might need to rebuild the header on tx failure.
1303 */
1304 memcpy(&hdr_buf, skb->data, sizeof(hdr_buf));
1305 skb_pull(skb, sizeof(hdr_buf));
1306
1307 proto = hdr_buf.h_proto;
1308 dg_size = skb->len;
1309
1310 /*
1311 * Set the transmission type for the packet. ARP packets and IP
1312 * broadcast packets are sent via GASP.
1313 */
1314 if (memcmp(hdr_buf.h_dest, net->broadcast, FWNET_ALEN) == 0
1315 || proto == htons(ETH_P_ARP)
1316 || (proto == htons(ETH_P_IP)
1317 && IN_MULTICAST(ntohl(ip_hdr(skb)->daddr)))) {
1318 max_payload = dev->broadcast_xmt_max_payload;
1319 datagram_label_ptr = &dev->broadcast_xmt_datagramlabel;
1320
1321 ptask->fifo_addr = FWNET_NO_FIFO_ADDR;
1322 ptask->generation = 0;
1323 ptask->dest_node = IEEE1394_ALL_NODES;
1324 ptask->speed = SCODE_100;
1325 } else {
1326 __be64 guid = get_unaligned((__be64 *)hdr_buf.h_dest);
1327 u8 generation;
1328
1329 peer = fwnet_peer_find_by_guid(dev, be64_to_cpu(guid));
1330 if (!peer || peer->fifo == FWNET_NO_FIFO_ADDR)
1331 goto fail;
1332
1333 generation = peer->generation;
1334 dest_node = peer->node_id;
1335 max_payload = peer->max_payload;
1336 datagram_label_ptr = &peer->datagram_label;
1337
1338 ptask->fifo_addr = peer->fifo;
1339 ptask->generation = generation;
1340 ptask->dest_node = dest_node;
1341 ptask->speed = peer->speed;
1342 }
1343
1344 /* If this is an ARP packet, convert it */
1345 if (proto == htons(ETH_P_ARP)) {
1346 struct arphdr *arp = (struct arphdr *)skb->data;
1347 unsigned char *arp_ptr = (unsigned char *)(arp + 1);
1348 struct rfc2734_arp *arp1394 = (struct rfc2734_arp *)skb->data;
1349 __be32 ipaddr;
1350
1351 ipaddr = get_unaligned((__be32 *)(arp_ptr + FWNET_ALEN));
1352
1353 arp1394->hw_addr_len = RFC2734_HW_ADDR_LEN;
1354 arp1394->max_rec = dev->card->max_receive;
1355 arp1394->sspd = dev->card->link_speed;
1356
1357 put_unaligned_be16(dev->local_fifo >> 32,
1358 &arp1394->fifo_hi);
1359 put_unaligned_be32(dev->local_fifo & 0xffffffff,
1360 &arp1394->fifo_lo);
1361 put_unaligned(ipaddr, &arp1394->sip);
1362 }
1363
1364 ptask->hdr.w0 = 0;
1365 ptask->hdr.w1 = 0;
1366 ptask->skb = skb;
1367 ptask->dev = dev;
1368
1369 /* Does it all fit in one packet? */
1370 if (dg_size <= max_payload) {
1371 fwnet_make_uf_hdr(&ptask->hdr, ntohs(proto));
1372 ptask->outstanding_pkts = 1;
1373 max_payload = dg_size + RFC2374_UNFRAG_HDR_SIZE;
1374 } else {
1375 u16 datagram_label;
1376
1377 max_payload -= RFC2374_FRAG_OVERHEAD;
1378 datagram_label = (*datagram_label_ptr)++;
1379 fwnet_make_ff_hdr(&ptask->hdr, ntohs(proto), dg_size,
1380 datagram_label);
1381 ptask->outstanding_pkts = DIV_ROUND_UP(dg_size, max_payload);
1382 max_payload += RFC2374_FRAG_HDR_SIZE;
1383 }
1384
1385 if (++dev->queued_datagrams == FWNET_MAX_QUEUED_DATAGRAMS)
1386 netif_stop_queue(dev->netdev);
1387
1388 spin_unlock_irqrestore(&dev->lock, flags);
1389
1390 ptask->max_payload = max_payload;
1391 ptask->enqueued = 0;
1392
1393 fwnet_send_packet(ptask);
1394
1395 return NETDEV_TX_OK;
1396
1397 fail:
1398 spin_unlock_irqrestore(&dev->lock, flags);
1399
1400 if (ptask)
1401 kmem_cache_free(fwnet_packet_task_cache, ptask);
1402
1403 if (skb != NULL)
1404 dev_kfree_skb(skb);
1405
1406 net->stats.tx_dropped++;
1407 net->stats.tx_errors++;
1408
1409 /*
1410 * FIXME: According to a patch from 2003-02-26, "returning non-zero
1411 * causes serious problems" here, allegedly. Before that patch,
1412 * -ERRNO was returned which is not appropriate under Linux 2.6.
1413 * Perhaps more needs to be done? Stop the queue in serious
1414 * conditions and restart it elsewhere?
1415 */
1416 return NETDEV_TX_OK;
1417}
1418
1419static int fwnet_change_mtu(struct net_device *net, int new_mtu)
1420{
1421 if (new_mtu < 68)
1422 return -EINVAL;
1423
1424 net->mtu = new_mtu;
1425 return 0;
1426}
1427
1428static const struct ethtool_ops fwnet_ethtool_ops = {
1429 .get_link = ethtool_op_get_link,
1430};
1431
1432static const struct net_device_ops fwnet_netdev_ops = {
1433 .ndo_open = fwnet_open,
1434 .ndo_stop = fwnet_stop,
1435 .ndo_start_xmit = fwnet_tx,
1436 .ndo_change_mtu = fwnet_change_mtu,
1437};
1438
1439static void fwnet_init_dev(struct net_device *net)
1440{
1441 net->header_ops = &fwnet_header_ops;
1442 net->netdev_ops = &fwnet_netdev_ops;
1443 net->watchdog_timeo = 2 * HZ;
1444 net->flags = IFF_BROADCAST | IFF_MULTICAST;
1445 net->features = NETIF_F_HIGHDMA;
1446 net->addr_len = FWNET_ALEN;
1447 net->hard_header_len = FWNET_HLEN;
1448 net->type = ARPHRD_IEEE1394;
1449 net->tx_queue_len = FWNET_TX_QUEUE_LEN;
1450 net->ethtool_ops = &fwnet_ethtool_ops;
1451}
1452
1453/* caller must hold fwnet_device_mutex */
1454static struct fwnet_device *fwnet_dev_find(struct fw_card *card)
1455{
1456 struct fwnet_device *dev;
1457
1458 list_for_each_entry(dev, &fwnet_device_list, dev_link)
1459 if (dev->card == card)
1460 return dev;
1461
1462 return NULL;
1463}
1464
1465static int fwnet_add_peer(struct fwnet_device *dev,
1466 struct fw_unit *unit, struct fw_device *device)
1467{
1468 struct fwnet_peer *peer;
1469
1470 peer = kmalloc(sizeof(*peer), GFP_KERNEL);
1471 if (!peer)
1472 return -ENOMEM;
1473
1474 dev_set_drvdata(&unit->device, peer);
1475
1476 peer->dev = dev;
1477 peer->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4];
1478 peer->fifo = FWNET_NO_FIFO_ADDR;
1479 peer->ip = 0;
1480 INIT_LIST_HEAD(&peer->pd_list);
1481 peer->pdg_size = 0;
1482 peer->datagram_label = 0;
1483 peer->speed = device->max_speed;
1484 peer->max_payload = fwnet_max_payload(device->max_rec, peer->speed);
1485
1486 peer->generation = device->generation;
1487 smp_rmb();
1488 peer->node_id = device->node_id;
1489
1490 spin_lock_irq(&dev->lock);
1491 list_add_tail(&peer->peer_link, &dev->peer_list);
1492 dev->peer_count++;
1493 set_carrier_state(dev);
1494 spin_unlock_irq(&dev->lock);
1495
1496 return 0;
1497}
1498
1499static int fwnet_probe(struct device *_dev)
1500{
1501 struct fw_unit *unit = fw_unit(_dev);
1502 struct fw_device *device = fw_parent_device(unit);
1503 struct fw_card *card = device->card;
1504 struct net_device *net;
1505 bool allocated_netdev = false;
1506 struct fwnet_device *dev;
1507 unsigned max_mtu;
1508 int ret;
1509
1510 mutex_lock(&fwnet_device_mutex);
1511
1512 dev = fwnet_dev_find(card);
1513 if (dev) {
1514 net = dev->netdev;
1515 goto have_dev;
1516 }
1517
1518 net = alloc_netdev(sizeof(*dev), "firewire%d", fwnet_init_dev);
1519 if (net == NULL) {
1520 ret = -ENOMEM;
1521 goto out;
1522 }
1523
1524 allocated_netdev = true;
1525 SET_NETDEV_DEV(net, card->device);
1526 dev = netdev_priv(net);
1527
1528 spin_lock_init(&dev->lock);
1529 dev->broadcast_state = FWNET_BROADCAST_ERROR;
1530 dev->broadcast_rcv_context = NULL;
1531 dev->broadcast_xmt_max_payload = 0;
1532 dev->broadcast_xmt_datagramlabel = 0;
1533 dev->local_fifo = FWNET_NO_FIFO_ADDR;
1534 dev->queued_datagrams = 0;
1535 INIT_LIST_HEAD(&dev->peer_list);
1536 dev->card = card;
1537 dev->netdev = net;
1538
1539 /*
1540 * Use the RFC 2734 default 1500 octets or the maximum payload
1541 * as initial MTU
1542 */
1543 max_mtu = (1 << (card->max_receive + 1))
1544 - sizeof(struct rfc2734_header) - IEEE1394_GASP_HDR_SIZE;
1545 net->mtu = min(1500U, max_mtu);
1546
1547 /* Set our hardware address while we're at it */
1548 put_unaligned_be64(card->guid, net->dev_addr);
1549 put_unaligned_be64(~0ULL, net->broadcast);
1550 ret = register_netdev(net);
1551 if (ret) {
1552 fw_error("Cannot register the driver\n");
1553 goto out;
1554 }
1555
1556 list_add_tail(&dev->dev_link, &fwnet_device_list);
1557 fw_notify("%s: IPv4 over FireWire on device %016llx\n",
1558 net->name, (unsigned long long)card->guid);
1559 have_dev:
1560 ret = fwnet_add_peer(dev, unit, device);
1561 if (ret && allocated_netdev) {
1562 unregister_netdev(net);
1563 list_del(&dev->dev_link);
1564 }
1565 out:
1566 if (ret && allocated_netdev)
1567 free_netdev(net);
1568
1569 mutex_unlock(&fwnet_device_mutex);
1570
1571 return ret;
1572}
1573
1574static void fwnet_remove_peer(struct fwnet_peer *peer, struct fwnet_device *dev)
1575{
1576 struct fwnet_partial_datagram *pd, *pd_next;
1577
1578 spin_lock_irq(&dev->lock);
1579 list_del(&peer->peer_link);
1580 dev->peer_count--;
1581 set_carrier_state(dev);
1582 spin_unlock_irq(&dev->lock);
1583
1584 list_for_each_entry_safe(pd, pd_next, &peer->pd_list, pd_link)
1585 fwnet_pd_delete(pd);
1586
1587 kfree(peer);
1588}
1589
1590static int fwnet_remove(struct device *_dev)
1591{
1592 struct fwnet_peer *peer = dev_get_drvdata(_dev);
1593 struct fwnet_device *dev = peer->dev;
1594 struct net_device *net;
1595 int i;
1596
1597 mutex_lock(&fwnet_device_mutex);
1598
1599 net = dev->netdev;
1600 if (net && peer->ip)
1601 arp_invalidate(net, peer->ip);
1602
1603 fwnet_remove_peer(peer, dev);
1604
1605 if (list_empty(&dev->peer_list)) {
1606 unregister_netdev(net);
1607
1608 if (dev->local_fifo != FWNET_NO_FIFO_ADDR)
1609 fw_core_remove_address_handler(&dev->handler);
1610 if (dev->broadcast_rcv_context) {
1611 fw_iso_context_stop(dev->broadcast_rcv_context);
1612 fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer,
1613 dev->card);
1614 fw_iso_context_destroy(dev->broadcast_rcv_context);
1615 }
1616 for (i = 0; dev->queued_datagrams && i < 5; i++)
1617 ssleep(1);
1618 WARN_ON(dev->queued_datagrams);
1619 list_del(&dev->dev_link);
1620
1621 free_netdev(net);
1622 }
1623
1624 mutex_unlock(&fwnet_device_mutex);
1625
1626 return 0;
1627}
1628
1629/*
1630 * FIXME abort partially sent fragmented datagrams,
1631 * discard partially received fragmented datagrams
1632 */
1633static void fwnet_update(struct fw_unit *unit)
1634{
1635 struct fw_device *device = fw_parent_device(unit);
1636 struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1637 int generation;
1638
1639 generation = device->generation;
1640
1641 spin_lock_irq(&peer->dev->lock);
1642 peer->node_id = device->node_id;
1643 peer->generation = generation;
1644 spin_unlock_irq(&peer->dev->lock);
1645}
1646
1647static const struct ieee1394_device_id fwnet_id_table[] = {
1648 {
1649 .match_flags = IEEE1394_MATCH_SPECIFIER_ID |
1650 IEEE1394_MATCH_VERSION,
1651 .specifier_id = IANA_SPECIFIER_ID,
1652 .version = RFC2734_SW_VERSION,
1653 },
1654 { }
1655};
1656
1657static struct fw_driver fwnet_driver = {
1658 .driver = {
1659 .owner = THIS_MODULE,
1660 .name = "net",
1661 .bus = &fw_bus_type,
1662 .probe = fwnet_probe,
1663 .remove = fwnet_remove,
1664 },
1665 .update = fwnet_update,
1666 .id_table = fwnet_id_table,
1667};
1668
1669static const u32 rfc2374_unit_directory_data[] = {
1670 0x00040000, /* directory_length */
1671 0x1200005e, /* unit_specifier_id: IANA */
1672 0x81000003, /* textual descriptor offset */
1673 0x13000001, /* unit_sw_version: RFC 2734 */
1674 0x81000005, /* textual descriptor offset */
1675 0x00030000, /* descriptor_length */
1676 0x00000000, /* text */
1677 0x00000000, /* minimal ASCII, en */
1678 0x49414e41, /* I A N A */
1679 0x00030000, /* descriptor_length */
1680 0x00000000, /* text */
1681 0x00000000, /* minimal ASCII, en */
1682 0x49507634, /* I P v 4 */
1683};
1684
1685static struct fw_descriptor rfc2374_unit_directory = {
1686 .length = ARRAY_SIZE(rfc2374_unit_directory_data),
1687 .key = (CSR_DIRECTORY | CSR_UNIT) << 24,
1688 .data = rfc2374_unit_directory_data
1689};
1690
1691static int __init fwnet_init(void)
1692{
1693 int err;
1694
1695 err = fw_core_add_descriptor(&rfc2374_unit_directory);
1696 if (err)
1697 return err;
1698
1699 fwnet_packet_task_cache = kmem_cache_create("packet_task",
1700 sizeof(struct fwnet_packet_task), 0, 0, NULL);
1701 if (!fwnet_packet_task_cache) {
1702 err = -ENOMEM;
1703 goto out;
1704 }
1705
1706 err = driver_register(&fwnet_driver.driver);
1707 if (!err)
1708 return 0;
1709
1710 kmem_cache_destroy(fwnet_packet_task_cache);
1711out:
1712 fw_core_remove_descriptor(&rfc2374_unit_directory);
1713
1714 return err;
1715}
1716module_init(fwnet_init);
1717
1718static void __exit fwnet_cleanup(void)
1719{
1720 driver_unregister(&fwnet_driver.driver);
1721 kmem_cache_destroy(fwnet_packet_task_cache);
1722 fw_core_remove_descriptor(&rfc2374_unit_directory);
1723}
1724module_exit(fwnet_cleanup);
1725
1726MODULE_AUTHOR("Jay Fenlason <fenlason@redhat.com>");
1727MODULE_DESCRIPTION("IPv4 over IEEE1394 as per RFC 2734");
1728MODULE_LICENSE("GPL");
1729MODULE_DEVICE_TABLE(ieee1394, fwnet_id_table);