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ipv[4|6]: correct dropwatch false positive in local_deliver_finish
[linux/fpc-iii.git] / drivers / firewire / net.c
blob2b27bff2591a029a193878812e3e8d00ca1134b4
1 /*
2 * IPv4 over IEEE 1394, per RFC 2734
3 *
4 * Copyright (C) 2009 Jay Fenlason <fenlason@redhat.com>
5 *
6 * based on eth1394 by Ben Collins et al
7 */
8
9 #include <linux/bug.h>
10 #include <linux/compiler.h>
11 #include <linux/delay.h>
12 #include <linux/device.h>
13 #include <linux/ethtool.h>
14 #include <linux/firewire.h>
15 #include <linux/firewire-constants.h>
16 #include <linux/highmem.h>
17 #include <linux/in.h>
18 #include <linux/ip.h>
19 #include <linux/jiffies.h>
20 #include <linux/mod_devicetable.h>
21 #include <linux/module.h>
22 #include <linux/moduleparam.h>
23 #include <linux/mutex.h>
24 #include <linux/netdevice.h>
25 #include <linux/skbuff.h>
26 #include <linux/slab.h>
27 #include <linux/spinlock.h>
28
29 #include <asm/unaligned.h>
30 #include <net/arp.h>
31
32 /* rx limits */
33 #define FWNET_MAX_FRAGMENTS 30 /* arbitrary, > TX queue depth */
34 #define FWNET_ISO_PAGE_COUNT (PAGE_SIZE < 16*1024 ? 4 : 2)
35
36 /* tx limits */
37 #define FWNET_MAX_QUEUED_DATAGRAMS 20 /* < 64 = number of tlabels */
38 #define FWNET_MIN_QUEUED_DATAGRAMS 10 /* should keep AT DMA busy enough */
39 #define FWNET_TX_QUEUE_LEN FWNET_MAX_QUEUED_DATAGRAMS /* ? */
40
41 #define IEEE1394_BROADCAST_CHANNEL 31
42 #define IEEE1394_ALL_NODES (0xffc0 | 0x003f)
43 #define IEEE1394_MAX_PAYLOAD_S100 512
44 #define FWNET_NO_FIFO_ADDR (~0ULL)
45
46 #define IANA_SPECIFIER_ID 0x00005eU
47 #define RFC2734_SW_VERSION 0x000001U
48
49 #define IEEE1394_GASP_HDR_SIZE 8
50
51 #define RFC2374_UNFRAG_HDR_SIZE 4
52 #define RFC2374_FRAG_HDR_SIZE 8
53 #define RFC2374_FRAG_OVERHEAD 4
54
55 #define RFC2374_HDR_UNFRAG 0 /* unfragmented */
56 #define RFC2374_HDR_FIRSTFRAG 1 /* first fragment */
57 #define RFC2374_HDR_LASTFRAG 2 /* last fragment */
58 #define RFC2374_HDR_INTFRAG 3 /* interior fragment */
59
60 #define RFC2734_HW_ADDR_LEN 16
61
62 struct rfc2734_arp {
63 __be16 hw_type; /* 0x0018 */
64 __be16 proto_type; /* 0x0806 */
65 u8 hw_addr_len; /* 16 */
66 u8 ip_addr_len; /* 4 */
67 __be16 opcode; /* ARP Opcode */
68 /* Above is exactly the same format as struct arphdr */
69
70 __be64 s_uniq_id; /* Sender's 64bit EUI */
71 u8 max_rec; /* Sender's max packet size */
72 u8 sspd; /* Sender's max speed */
73 __be16 fifo_hi; /* hi 16bits of sender's FIFO addr */
74 __be32 fifo_lo; /* lo 32bits of sender's FIFO addr */
75 __be32 sip; /* Sender's IP Address */
76 __be32 tip; /* IP Address of requested hw addr */
77 } __packed;
78
79 /* This header format is specific to this driver implementation. */
80 #define FWNET_ALEN 8
81 #define FWNET_HLEN 10
82 struct fwnet_header {
83 u8 h_dest[FWNET_ALEN]; /* destination address */
84 __be16 h_proto; /* packet type ID field */
85 } __packed;
86
87 /* IPv4 and IPv6 encapsulation header */
88 struct rfc2734_header {
89 u32 w0;
90 u32 w1;
91 };
92
93 #define fwnet_get_hdr_lf(h) (((h)->w0 & 0xc0000000) >> 30)
94 #define fwnet_get_hdr_ether_type(h) (((h)->w0 & 0x0000ffff))
95 #define fwnet_get_hdr_dg_size(h) (((h)->w0 & 0x0fff0000) >> 16)
96 #define fwnet_get_hdr_fg_off(h) (((h)->w0 & 0x00000fff))
97 #define fwnet_get_hdr_dgl(h) (((h)->w1 & 0xffff0000) >> 16)
98
99 #define fwnet_set_hdr_lf(lf) ((lf) << 30)
100 #define fwnet_set_hdr_ether_type(et) (et)
101 #define fwnet_set_hdr_dg_size(dgs) ((dgs) << 16)
102 #define fwnet_set_hdr_fg_off(fgo) (fgo)
103
104 #define fwnet_set_hdr_dgl(dgl) ((dgl) << 16)
105
106 static inline void fwnet_make_uf_hdr(struct rfc2734_header *hdr,
107 unsigned ether_type)
108 {
109 hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_UNFRAG)
110 | fwnet_set_hdr_ether_type(ether_type);
111 }
112
113 static inline void fwnet_make_ff_hdr(struct rfc2734_header *hdr,
114 unsigned ether_type, unsigned dg_size, unsigned dgl)
115 {
116 hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_FIRSTFRAG)
117 | fwnet_set_hdr_dg_size(dg_size)
118 | fwnet_set_hdr_ether_type(ether_type);
119 hdr->w1 = fwnet_set_hdr_dgl(dgl);
120 }
121
122 static inline void fwnet_make_sf_hdr(struct rfc2734_header *hdr,
123 unsigned lf, unsigned dg_size, unsigned fg_off, unsigned dgl)
124 {
125 hdr->w0 = fwnet_set_hdr_lf(lf)
126 | fwnet_set_hdr_dg_size(dg_size)
127 | fwnet_set_hdr_fg_off(fg_off);
128 hdr->w1 = fwnet_set_hdr_dgl(dgl);
129 }
130
131 /* This list keeps track of what parts of the datagram have been filled in */
132 struct fwnet_fragment_info {
133 struct list_head fi_link;
134 u16 offset;
135 u16 len;
136 };
137
138 struct fwnet_partial_datagram {
139 struct list_head pd_link;
140 struct list_head fi_list;
141 struct sk_buff *skb;
142 /* FIXME Why not use skb->data? */
143 char *pbuf;
144 u16 datagram_label;
145 u16 ether_type;
146 u16 datagram_size;
147 };
148
149 static DEFINE_MUTEX(fwnet_device_mutex);
150 static LIST_HEAD(fwnet_device_list);
151
152 struct fwnet_device {
153 struct list_head dev_link;
154 spinlock_t lock;
155 enum {
156 FWNET_BROADCAST_ERROR,
157 FWNET_BROADCAST_RUNNING,
158 FWNET_BROADCAST_STOPPED,
159 } broadcast_state;
160 struct fw_iso_context *broadcast_rcv_context;
161 struct fw_iso_buffer broadcast_rcv_buffer;
162 void **broadcast_rcv_buffer_ptrs;
163 unsigned broadcast_rcv_next_ptr;
164 unsigned num_broadcast_rcv_ptrs;
165 unsigned rcv_buffer_size;
166 /*
167 * This value is the maximum unfragmented datagram size that can be
168 * sent by the hardware. It already has the GASP overhead and the
169 * unfragmented datagram header overhead calculated into it.
170 */
171 unsigned broadcast_xmt_max_payload;
172 u16 broadcast_xmt_datagramlabel;
173
174 /*
175 * The CSR address that remote nodes must send datagrams to for us to
176 * receive them.
177 */
178 struct fw_address_handler handler;
179 u64 local_fifo;
180
181 /* Number of tx datagrams that have been queued but not yet acked */
182 int queued_datagrams;
183
184 int peer_count;
185 struct list_head peer_list;
186 struct fw_card *card;
187 struct net_device *netdev;
188 };
189
190 struct fwnet_peer {
191 struct list_head peer_link;
192 struct fwnet_device *dev;
193 u64 guid;
194 u64 fifo;
195 __be32 ip;
196
197 /* guarded by dev->lock */
198 struct list_head pd_list; /* received partial datagrams */
199 unsigned pdg_size; /* pd_list size */
200
201 u16 datagram_label; /* outgoing datagram label */
202 u16 max_payload; /* includes RFC2374_FRAG_HDR_SIZE overhead */
203 int node_id;
204 int generation;
205 unsigned speed;
206 };
207
208 /* This is our task struct. It's used for the packet complete callback. */
209 struct fwnet_packet_task {
210 struct fw_transaction transaction;
211 struct rfc2734_header hdr;
212 struct sk_buff *skb;
213 struct fwnet_device *dev;
214
215 int outstanding_pkts;
216 u64 fifo_addr;
217 u16 dest_node;
218 u16 max_payload;
219 u8 generation;
220 u8 speed;
221 u8 enqueued;
222 };
223
224 /*
225 * saddr == NULL means use device source address.
226 * daddr == NULL means leave destination address (eg unresolved arp).
227 */
228 static int fwnet_header_create(struct sk_buff *skb, struct net_device *net,
229 unsigned short type, const void *daddr,
230 const void *saddr, unsigned len)
231 {
232 struct fwnet_header *h;
233
234 h = (struct fwnet_header *)skb_push(skb, sizeof(*h));
235 put_unaligned_be16(type, &h->h_proto);
236
237 if (net->flags & (IFF_LOOPBACK | IFF_NOARP)) {
238 memset(h->h_dest, 0, net->addr_len);
239
240 return net->hard_header_len;
241 }
242
243 if (daddr) {
244 memcpy(h->h_dest, daddr, net->addr_len);
245
246 return net->hard_header_len;
247 }
248
249 return -net->hard_header_len;
250 }
251
252 static int fwnet_header_rebuild(struct sk_buff *skb)
253 {
254 struct fwnet_header *h = (struct fwnet_header *)skb->data;
255
256 if (get_unaligned_be16(&h->h_proto) == ETH_P_IP)
257 return arp_find((unsigned char *)&h->h_dest, skb);
258
259 dev_notice(&skb->dev->dev, "unable to resolve type %04x addresses\n",
260 be16_to_cpu(h->h_proto));
261 return 0;
262 }
263
264 static int fwnet_header_cache(const struct neighbour *neigh,
265 struct hh_cache *hh, __be16 type)
266 {
267 struct net_device *net;
268 struct fwnet_header *h;
269
270 if (type == cpu_to_be16(ETH_P_802_3))
271 return -1;
272 net = neigh->dev;
273 h = (struct fwnet_header *)((u8 *)hh->hh_data + HH_DATA_OFF(sizeof(*h)));
274 h->h_proto = type;
275 memcpy(h->h_dest, neigh->ha, net->addr_len);
276 hh->hh_len = FWNET_HLEN;
277
278 return 0;
279 }
280
281 /* Called by Address Resolution module to notify changes in address. */
282 static void fwnet_header_cache_update(struct hh_cache *hh,
283 const struct net_device *net, const unsigned char *haddr)
284 {
285 memcpy((u8 *)hh->hh_data + HH_DATA_OFF(FWNET_HLEN), haddr, net->addr_len);
286 }
287
288 static int fwnet_header_parse(const struct sk_buff *skb, unsigned char *haddr)
289 {
290 memcpy(haddr, skb->dev->dev_addr, FWNET_ALEN);
291
292 return FWNET_ALEN;
293 }
294
295 static const struct header_ops fwnet_header_ops = {
296 .create = fwnet_header_create,
297 .rebuild = fwnet_header_rebuild,
298 .cache = fwnet_header_cache,
299 .cache_update = fwnet_header_cache_update,
300 .parse = fwnet_header_parse,
301 };
302
303 /* FIXME: is this correct for all cases? */
304 static bool fwnet_frag_overlap(struct fwnet_partial_datagram *pd,
305 unsigned offset, unsigned len)
306 {
307 struct fwnet_fragment_info *fi;
308 unsigned end = offset + len;
309
310 list_for_each_entry(fi, &pd->fi_list, fi_link)
311 if (offset < fi->offset + fi->len && end > fi->offset)
312 return true;
313
314 return false;
315 }
316
317 /* Assumes that new fragment does not overlap any existing fragments */
318 static struct fwnet_fragment_info *fwnet_frag_new(
319 struct fwnet_partial_datagram *pd, unsigned offset, unsigned len)
320 {
321 struct fwnet_fragment_info *fi, *fi2, *new;
322 struct list_head *list;
323
324 list = &pd->fi_list;
325 list_for_each_entry(fi, &pd->fi_list, fi_link) {
326 if (fi->offset + fi->len == offset) {
327 /* The new fragment can be tacked on to the end */
328 /* Did the new fragment plug a hole? */
329 fi2 = list_entry(fi->fi_link.next,
330 struct fwnet_fragment_info, fi_link);
331 if (fi->offset + fi->len == fi2->offset) {
332 /* glue fragments together */
333 fi->len += len + fi2->len;
334 list_del(&fi2->fi_link);
335 kfree(fi2);
336 } else {
337 fi->len += len;
338 }
339
340 return fi;
341 }
342 if (offset + len == fi->offset) {
343 /* The new fragment can be tacked on to the beginning */
344 /* Did the new fragment plug a hole? */
345 fi2 = list_entry(fi->fi_link.prev,
346 struct fwnet_fragment_info, fi_link);
347 if (fi2->offset + fi2->len == fi->offset) {
348 /* glue fragments together */
349 fi2->len += fi->len + len;
350 list_del(&fi->fi_link);
351 kfree(fi);
352
353 return fi2;
354 }
355 fi->offset = offset;
356 fi->len += len;
357
358 return fi;
359 }
360 if (offset > fi->offset + fi->len) {
361 list = &fi->fi_link;
362 break;
363 }
364 if (offset + len < fi->offset) {
365 list = fi->fi_link.prev;
366 break;
367 }
368 }
369
370 new = kmalloc(sizeof(*new), GFP_ATOMIC);
371 if (!new) {
372 dev_err(&pd->skb->dev->dev, "out of memory\n");
373 return NULL;
374 }
375
376 new->offset = offset;
377 new->len = len;
378 list_add(&new->fi_link, list);
379
380 return new;
381 }
382
383 static struct fwnet_partial_datagram *fwnet_pd_new(struct net_device *net,
384 struct fwnet_peer *peer, u16 datagram_label, unsigned dg_size,
385 void *frag_buf, unsigned frag_off, unsigned frag_len)
386 {
387 struct fwnet_partial_datagram *new;
388 struct fwnet_fragment_info *fi;
389
390 new = kmalloc(sizeof(*new), GFP_ATOMIC);
391 if (!new)
392 goto fail;
393
394 INIT_LIST_HEAD(&new->fi_list);
395 fi = fwnet_frag_new(new, frag_off, frag_len);
396 if (fi == NULL)
397 goto fail_w_new;
398
399 new->datagram_label = datagram_label;
400 new->datagram_size = dg_size;
401 new->skb = dev_alloc_skb(dg_size + LL_RESERVED_SPACE(net));
402 if (new->skb == NULL)
403 goto fail_w_fi;
404
405 skb_reserve(new->skb, LL_RESERVED_SPACE(net));
406 new->pbuf = skb_put(new->skb, dg_size);
407 memcpy(new->pbuf + frag_off, frag_buf, frag_len);
408 list_add_tail(&new->pd_link, &peer->pd_list);
409
410 return new;
411
412 fail_w_fi:
413 kfree(fi);
414 fail_w_new:
415 kfree(new);
416 fail:
417 dev_err(&net->dev, "out of memory\n");
418
419 return NULL;
420 }
421
422 static struct fwnet_partial_datagram *fwnet_pd_find(struct fwnet_peer *peer,
423 u16 datagram_label)
424 {
425 struct fwnet_partial_datagram *pd;
426
427 list_for_each_entry(pd, &peer->pd_list, pd_link)
428 if (pd->datagram_label == datagram_label)
429 return pd;
430
431 return NULL;
432 }
433
434
435 static void fwnet_pd_delete(struct fwnet_partial_datagram *old)
436 {
437 struct fwnet_fragment_info *fi, *n;
438
439 list_for_each_entry_safe(fi, n, &old->fi_list, fi_link)
440 kfree(fi);
441
442 list_del(&old->pd_link);
443 dev_kfree_skb_any(old->skb);
444 kfree(old);
445 }
446
447 static bool fwnet_pd_update(struct fwnet_peer *peer,
448 struct fwnet_partial_datagram *pd, void *frag_buf,
449 unsigned frag_off, unsigned frag_len)
450 {
451 if (fwnet_frag_new(pd, frag_off, frag_len) == NULL)
452 return false;
453
454 memcpy(pd->pbuf + frag_off, frag_buf, frag_len);
455
456 /*
457 * Move list entry to beginning of list so that oldest partial
458 * datagrams percolate to the end of the list
459 */
460 list_move_tail(&pd->pd_link, &peer->pd_list);
461
462 return true;
463 }
464
465 static bool fwnet_pd_is_complete(struct fwnet_partial_datagram *pd)
466 {
467 struct fwnet_fragment_info *fi;
468
469 fi = list_entry(pd->fi_list.next, struct fwnet_fragment_info, fi_link);
470
471 return fi->len == pd->datagram_size;
472 }
473
474 /* caller must hold dev->lock */
475 static struct fwnet_peer *fwnet_peer_find_by_guid(struct fwnet_device *dev,
476 u64 guid)
477 {
478 struct fwnet_peer *peer;
479
480 list_for_each_entry(peer, &dev->peer_list, peer_link)
481 if (peer->guid == guid)
482 return peer;
483
484 return NULL;
485 }
486
487 /* caller must hold dev->lock */
488 static struct fwnet_peer *fwnet_peer_find_by_node_id(struct fwnet_device *dev,
489 int node_id, int generation)
490 {
491 struct fwnet_peer *peer;
492
493 list_for_each_entry(peer, &dev->peer_list, peer_link)
494 if (peer->node_id == node_id &&
495 peer->generation == generation)
496 return peer;
497
498 return NULL;
499 }
500
501 /* See IEEE 1394-2008 table 6-4, table 8-8, table 16-18. */
502 static unsigned fwnet_max_payload(unsigned max_rec, unsigned speed)
503 {
504 max_rec = min(max_rec, speed + 8);
505 max_rec = clamp(max_rec, 8U, 11U); /* 512...4096 */
506
507 return (1 << (max_rec + 1)) - RFC2374_FRAG_HDR_SIZE;
508 }
509
510
511 static int fwnet_finish_incoming_packet(struct net_device *net,
512 struct sk_buff *skb, u16 source_node_id,
513 bool is_broadcast, u16 ether_type)
514 {
515 struct fwnet_device *dev;
516 static const __be64 broadcast_hw = cpu_to_be64(~0ULL);
517 int status;
518 __be64 guid;
519
520 dev = netdev_priv(net);
521 /* Write metadata, and then pass to the receive level */
522 skb->dev = net;
523 skb->ip_summed = CHECKSUM_NONE;
524
525 /*
526 * Parse the encapsulation header. This actually does the job of
527 * converting to an ethernet frame header, as well as arp
528 * conversion if needed. ARP conversion is easier in this
529 * direction, since we are using ethernet as our backend.
530 */
531 /*
532 * If this is an ARP packet, convert it. First, we want to make
533 * use of some of the fields, since they tell us a little bit
534 * about the sending machine.
535 */
536 if (ether_type == ETH_P_ARP) {
537 struct rfc2734_arp *arp1394;
538 struct arphdr *arp;
539 unsigned char *arp_ptr;
540 u64 fifo_addr;
541 u64 peer_guid;
542 unsigned sspd;
543 u16 max_payload;
544 struct fwnet_peer *peer;
545 unsigned long flags;
546
547 arp1394 = (struct rfc2734_arp *)skb->data;
548 arp = (struct arphdr *)skb->data;
549 arp_ptr = (unsigned char *)(arp + 1);
550 peer_guid = get_unaligned_be64(&arp1394->s_uniq_id);
551 fifo_addr = (u64)get_unaligned_be16(&arp1394->fifo_hi) << 32
552 | get_unaligned_be32(&arp1394->fifo_lo);
553
554 sspd = arp1394->sspd;
555 /* Sanity check. OS X 10.3 PPC reportedly sends 131. */
556 if (sspd > SCODE_3200) {
557 dev_notice(&net->dev, "sspd %x out of range\n", sspd);
558 sspd = SCODE_3200;
559 }
560 max_payload = fwnet_max_payload(arp1394->max_rec, sspd);
561
562 spin_lock_irqsave(&dev->lock, flags);
563 peer = fwnet_peer_find_by_guid(dev, peer_guid);
564 if (peer) {
565 peer->fifo = fifo_addr;
566
567 if (peer->speed > sspd)
568 peer->speed = sspd;
569 if (peer->max_payload > max_payload)
570 peer->max_payload = max_payload;
571
572 peer->ip = arp1394->sip;
573 }
574 spin_unlock_irqrestore(&dev->lock, flags);
575
576 if (!peer) {
577 dev_notice(&net->dev,
578 "no peer for ARP packet from %016llx\n",
579 (unsigned long long)peer_guid);
580 goto no_peer;
581 }
582
583 /*
584 * Now that we're done with the 1394 specific stuff, we'll
585 * need to alter some of the data. Believe it or not, all
586 * that needs to be done is sender_IP_address needs to be
587 * moved, the destination hardware address get stuffed
588 * in and the hardware address length set to 8.
589 *
590 * IMPORTANT: The code below overwrites 1394 specific data
591 * needed above so keep the munging of the data for the
592 * higher level IP stack last.
593 */
594
595 arp->ar_hln = 8;
596 /* skip over sender unique id */
597 arp_ptr += arp->ar_hln;
598 /* move sender IP addr */
599 put_unaligned(arp1394->sip, (u32 *)arp_ptr);
600 /* skip over sender IP addr */
601 arp_ptr += arp->ar_pln;
602
603 if (arp->ar_op == htons(ARPOP_REQUEST))
604 memset(arp_ptr, 0, sizeof(u64));
605 else
606 memcpy(arp_ptr, net->dev_addr, sizeof(u64));
607 }
608
609 /* Now add the ethernet header. */
610 guid = cpu_to_be64(dev->card->guid);
611 if (dev_hard_header(skb, net, ether_type,
612 is_broadcast ? &broadcast_hw : &guid,
613 NULL, skb->len) >= 0) {
614 struct fwnet_header *eth;
615 u16 *rawp;
616 __be16 protocol;
617
618 skb_reset_mac_header(skb);
619 skb_pull(skb, sizeof(*eth));
620 eth = (struct fwnet_header *)skb_mac_header(skb);
621 if (*eth->h_dest & 1) {
622 if (memcmp(eth->h_dest, net->broadcast,
623 net->addr_len) == 0)
624 skb->pkt_type = PACKET_BROADCAST;
625 #if 0
626 else
627 skb->pkt_type = PACKET_MULTICAST;
628 #endif
629 } else {
630 if (memcmp(eth->h_dest, net->dev_addr, net->addr_len))
631 skb->pkt_type = PACKET_OTHERHOST;
632 }
633 if (ntohs(eth->h_proto) >= 1536) {
634 protocol = eth->h_proto;
635 } else {
636 rawp = (u16 *)skb->data;
637 if (*rawp == 0xffff)
638 protocol = htons(ETH_P_802_3);
639 else
640 protocol = htons(ETH_P_802_2);
641 }
642 skb->protocol = protocol;
643 }
644 status = netif_rx(skb);
645 if (status == NET_RX_DROP) {
646 net->stats.rx_errors++;
647 net->stats.rx_dropped++;
648 } else {
649 net->stats.rx_packets++;
650 net->stats.rx_bytes += skb->len;
651 }
652
653 return 0;
654
655 no_peer:
656 net->stats.rx_errors++;
657 net->stats.rx_dropped++;
658
659 dev_kfree_skb_any(skb);
660
661 return -ENOENT;
662 }
663
664 static int fwnet_incoming_packet(struct fwnet_device *dev, __be32 *buf, int len,
665 int source_node_id, int generation,
666 bool is_broadcast)
667 {
668 struct sk_buff *skb;
669 struct net_device *net = dev->netdev;
670 struct rfc2734_header hdr;
671 unsigned lf;
672 unsigned long flags;
673 struct fwnet_peer *peer;
674 struct fwnet_partial_datagram *pd;
675 int fg_off;
676 int dg_size;
677 u16 datagram_label;
678 int retval;
679 u16 ether_type;
680
681 hdr.w0 = be32_to_cpu(buf[0]);
682 lf = fwnet_get_hdr_lf(&hdr);
683 if (lf == RFC2374_HDR_UNFRAG) {
684 /*
685 * An unfragmented datagram has been received by the ieee1394
686 * bus. Build an skbuff around it so we can pass it to the
687 * high level network layer.
688 */
689 ether_type = fwnet_get_hdr_ether_type(&hdr);
690 buf++;
691 len -= RFC2374_UNFRAG_HDR_SIZE;
692
693 skb = dev_alloc_skb(len + LL_RESERVED_SPACE(net));
694 if (unlikely(!skb)) {
695 dev_err(&net->dev, "out of memory\n");
696 net->stats.rx_dropped++;
697
698 return -ENOMEM;
699 }
700 skb_reserve(skb, LL_RESERVED_SPACE(net));
701 memcpy(skb_put(skb, len), buf, len);
702
703 return fwnet_finish_incoming_packet(net, skb, source_node_id,
704 is_broadcast, ether_type);
705 }
706 /* A datagram fragment has been received, now the fun begins. */
707 hdr.w1 = ntohl(buf[1]);
708 buf += 2;
709 len -= RFC2374_FRAG_HDR_SIZE;
710 if (lf == RFC2374_HDR_FIRSTFRAG) {
711 ether_type = fwnet_get_hdr_ether_type(&hdr);
712 fg_off = 0;
713 } else {
714 ether_type = 0;
715 fg_off = fwnet_get_hdr_fg_off(&hdr);
716 }
717 datagram_label = fwnet_get_hdr_dgl(&hdr);
718 dg_size = fwnet_get_hdr_dg_size(&hdr); /* ??? + 1 */
719
720 spin_lock_irqsave(&dev->lock, flags);
721
722 peer = fwnet_peer_find_by_node_id(dev, source_node_id, generation);
723 if (!peer) {
724 retval = -ENOENT;
725 goto fail;
726 }
727
728 pd = fwnet_pd_find(peer, datagram_label);
729 if (pd == NULL) {
730 while (peer->pdg_size >= FWNET_MAX_FRAGMENTS) {
731 /* remove the oldest */
732 fwnet_pd_delete(list_first_entry(&peer->pd_list,
733 struct fwnet_partial_datagram, pd_link));
734 peer->pdg_size--;
735 }
736 pd = fwnet_pd_new(net, peer, datagram_label,
737 dg_size, buf, fg_off, len);
738 if (pd == NULL) {
739 retval = -ENOMEM;
740 goto fail;
741 }
742 peer->pdg_size++;
743 } else {
744 if (fwnet_frag_overlap(pd, fg_off, len) ||
745 pd->datagram_size != dg_size) {
746 /*
747 * Differing datagram sizes or overlapping fragments,
748 * discard old datagram and start a new one.
749 */
750 fwnet_pd_delete(pd);
751 pd = fwnet_pd_new(net, peer, datagram_label,
752 dg_size, buf, fg_off, len);
753 if (pd == NULL) {
754 peer->pdg_size--;
755 retval = -ENOMEM;
756 goto fail;
757 }
758 } else {
759 if (!fwnet_pd_update(peer, pd, buf, fg_off, len)) {
760 /*
761 * Couldn't save off fragment anyway
762 * so might as well obliterate the
763 * datagram now.
764 */
765 fwnet_pd_delete(pd);
766 peer->pdg_size--;
767 retval = -ENOMEM;
768 goto fail;
769 }
770 }
771 } /* new datagram or add to existing one */
772
773 if (lf == RFC2374_HDR_FIRSTFRAG)
774 pd->ether_type = ether_type;
775
776 if (fwnet_pd_is_complete(pd)) {
777 ether_type = pd->ether_type;
778 peer->pdg_size--;
779 skb = skb_get(pd->skb);
780 fwnet_pd_delete(pd);
781
782 spin_unlock_irqrestore(&dev->lock, flags);
783
784 return fwnet_finish_incoming_packet(net, skb, source_node_id,
785 false, ether_type);
786 }
787 /*
788 * Datagram is not complete, we're done for the
789 * moment.
790 */
791 retval = 0;
792 fail:
793 spin_unlock_irqrestore(&dev->lock, flags);
794
795 return retval;
796 }
797
798 static void fwnet_receive_packet(struct fw_card *card, struct fw_request *r,
799 int tcode, int destination, int source, int generation,
800 unsigned long long offset, void *payload, size_t length,
801 void *callback_data)
802 {
803 struct fwnet_device *dev = callback_data;
804 int rcode;
805
806 if (destination == IEEE1394_ALL_NODES) {
807 kfree(r);
808
809 return;
810 }
811
812 if (offset != dev->handler.offset)
813 rcode = RCODE_ADDRESS_ERROR;
814 else if (tcode != TCODE_WRITE_BLOCK_REQUEST)
815 rcode = RCODE_TYPE_ERROR;
816 else if (fwnet_incoming_packet(dev, payload, length,
817 source, generation, false) != 0) {
818 dev_err(&dev->netdev->dev, "incoming packet failure\n");
819 rcode = RCODE_CONFLICT_ERROR;
820 } else
821 rcode = RCODE_COMPLETE;
822
823 fw_send_response(card, r, rcode);
824 }
825
826 static void fwnet_receive_broadcast(struct fw_iso_context *context,
827 u32 cycle, size_t header_length, void *header, void *data)
828 {
829 struct fwnet_device *dev;
830 struct fw_iso_packet packet;
831 __be16 *hdr_ptr;
832 __be32 *buf_ptr;
833 int retval;
834 u32 length;
835 u16 source_node_id;
836 u32 specifier_id;
837 u32 ver;
838 unsigned long offset;
839 unsigned long flags;
840
841 dev = data;
842 hdr_ptr = header;
843 length = be16_to_cpup(hdr_ptr);
844
845 spin_lock_irqsave(&dev->lock, flags);
846
847 offset = dev->rcv_buffer_size * dev->broadcast_rcv_next_ptr;
848 buf_ptr = dev->broadcast_rcv_buffer_ptrs[dev->broadcast_rcv_next_ptr++];
849 if (dev->broadcast_rcv_next_ptr == dev->num_broadcast_rcv_ptrs)
850 dev->broadcast_rcv_next_ptr = 0;
851
852 spin_unlock_irqrestore(&dev->lock, flags);
853
854 specifier_id = (be32_to_cpu(buf_ptr[0]) & 0xffff) << 8
855 | (be32_to_cpu(buf_ptr[1]) & 0xff000000) >> 24;
856 ver = be32_to_cpu(buf_ptr[1]) & 0xffffff;
857 source_node_id = be32_to_cpu(buf_ptr[0]) >> 16;
858
859 if (specifier_id == IANA_SPECIFIER_ID && ver == RFC2734_SW_VERSION) {
860 buf_ptr += 2;
861 length -= IEEE1394_GASP_HDR_SIZE;
862 fwnet_incoming_packet(dev, buf_ptr, length, source_node_id,
863 context->card->generation, true);
864 }
865
866 packet.payload_length = dev->rcv_buffer_size;
867 packet.interrupt = 1;
868 packet.skip = 0;
869 packet.tag = 3;
870 packet.sy = 0;
871 packet.header_length = IEEE1394_GASP_HDR_SIZE;
872
873 spin_lock_irqsave(&dev->lock, flags);
874
875 retval = fw_iso_context_queue(dev->broadcast_rcv_context, &packet,
876 &dev->broadcast_rcv_buffer, offset);
877
878 spin_unlock_irqrestore(&dev->lock, flags);
879
880 if (retval >= 0)
881 fw_iso_context_queue_flush(dev->broadcast_rcv_context);
882 else
883 dev_err(&dev->netdev->dev, "requeue failed\n");
884 }
885
886 static struct kmem_cache *fwnet_packet_task_cache;
887
888 static void fwnet_free_ptask(struct fwnet_packet_task *ptask)
889 {
890 dev_kfree_skb_any(ptask->skb);
891 kmem_cache_free(fwnet_packet_task_cache, ptask);
892 }
893
894 /* Caller must hold dev->lock. */
895 static void dec_queued_datagrams(struct fwnet_device *dev)
896 {
897 if (--dev->queued_datagrams == FWNET_MIN_QUEUED_DATAGRAMS)
898 netif_wake_queue(dev->netdev);
899 }
900
901 static int fwnet_send_packet(struct fwnet_packet_task *ptask);
902
903 static void fwnet_transmit_packet_done(struct fwnet_packet_task *ptask)
904 {
905 struct fwnet_device *dev = ptask->dev;
906 struct sk_buff *skb = ptask->skb;
907 unsigned long flags;
908 bool free;
909
910 spin_lock_irqsave(&dev->lock, flags);
911
912 ptask->outstanding_pkts--;
913
914 /* Check whether we or the networking TX soft-IRQ is last user. */
915 free = (ptask->outstanding_pkts == 0 && ptask->enqueued);
916 if (free)
917 dec_queued_datagrams(dev);
918
919 if (ptask->outstanding_pkts == 0) {
920 dev->netdev->stats.tx_packets++;
921 dev->netdev->stats.tx_bytes += skb->len;
922 }
923
924 spin_unlock_irqrestore(&dev->lock, flags);
925
926 if (ptask->outstanding_pkts > 0) {
927 u16 dg_size;
928 u16 fg_off;
929 u16 datagram_label;
930 u16 lf;
931
932 /* Update the ptask to point to the next fragment and send it */
933 lf = fwnet_get_hdr_lf(&ptask->hdr);
934 switch (lf) {
935 case RFC2374_HDR_LASTFRAG:
936 case RFC2374_HDR_UNFRAG:
937 default:
938 dev_err(&dev->netdev->dev,
939 "outstanding packet %x lf %x, header %x,%x\n",
940 ptask->outstanding_pkts, lf, ptask->hdr.w0,
941 ptask->hdr.w1);
942 BUG();
943
944 case RFC2374_HDR_FIRSTFRAG:
945 /* Set frag type here for future interior fragments */
946 dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
947 fg_off = ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
948 datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
949 break;
950
951 case RFC2374_HDR_INTFRAG:
952 dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
953 fg_off = fwnet_get_hdr_fg_off(&ptask->hdr)
954 + ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
955 datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
956 break;
957 }
958
959 if (ptask->dest_node == IEEE1394_ALL_NODES) {
960 skb_pull(skb,
961 ptask->max_payload + IEEE1394_GASP_HDR_SIZE);
962 } else {
963 skb_pull(skb, ptask->max_payload);
964 }
965 if (ptask->outstanding_pkts > 1) {
966 fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_INTFRAG,
967 dg_size, fg_off, datagram_label);
968 } else {
969 fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_LASTFRAG,
970 dg_size, fg_off, datagram_label);
971 ptask->max_payload = skb->len + RFC2374_FRAG_HDR_SIZE;
972 }
973 fwnet_send_packet(ptask);
974 }
975
976 if (free)
977 fwnet_free_ptask(ptask);
978 }
979
980 static void fwnet_transmit_packet_failed(struct fwnet_packet_task *ptask)
981 {
982 struct fwnet_device *dev = ptask->dev;
983 unsigned long flags;
984 bool free;
985
986 spin_lock_irqsave(&dev->lock, flags);
987
988 /* One fragment failed; don't try to send remaining fragments. */
989 ptask->outstanding_pkts = 0;
990
991 /* Check whether we or the networking TX soft-IRQ is last user. */
992 free = ptask->enqueued;
993 if (free)
994 dec_queued_datagrams(dev);
995
996 dev->netdev->stats.tx_dropped++;
997 dev->netdev->stats.tx_errors++;
998
999 spin_unlock_irqrestore(&dev->lock, flags);
1000
1001 if (free)
1002 fwnet_free_ptask(ptask);
1003 }
1004
1005 static void fwnet_write_complete(struct fw_card *card, int rcode,
1006 void *payload, size_t length, void *data)
1007 {
1008 struct fwnet_packet_task *ptask = data;
1009 static unsigned long j;
1010 static int last_rcode, errors_skipped;
1011
1012 if (rcode == RCODE_COMPLETE) {
1013 fwnet_transmit_packet_done(ptask);
1014 } else {
1015 fwnet_transmit_packet_failed(ptask);
1016
1017 if (printk_timed_ratelimit(&j, 1000) || rcode != last_rcode) {
1018 dev_err(&ptask->dev->netdev->dev,
1019 "fwnet_write_complete failed: %x (skipped %d)\n",
1020 rcode, errors_skipped);
1021
1022 errors_skipped = 0;
1023 last_rcode = rcode;
1024 } else
1025 errors_skipped++;
1026 }
1027 }
1028
1029 static int fwnet_send_packet(struct fwnet_packet_task *ptask)
1030 {
1031 struct fwnet_device *dev;
1032 unsigned tx_len;
1033 struct rfc2734_header *bufhdr;
1034 unsigned long flags;
1035 bool free;
1036
1037 dev = ptask->dev;
1038 tx_len = ptask->max_payload;
1039 switch (fwnet_get_hdr_lf(&ptask->hdr)) {
1040 case RFC2374_HDR_UNFRAG:
1041 bufhdr = (struct rfc2734_header *)
1042 skb_push(ptask->skb, RFC2374_UNFRAG_HDR_SIZE);
1043 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
1044 break;
1045
1046 case RFC2374_HDR_FIRSTFRAG:
1047 case RFC2374_HDR_INTFRAG:
1048 case RFC2374_HDR_LASTFRAG:
1049 bufhdr = (struct rfc2734_header *)
1050 skb_push(ptask->skb, RFC2374_FRAG_HDR_SIZE);
1051 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
1052 put_unaligned_be32(ptask->hdr.w1, &bufhdr->w1);
1053 break;
1054
1055 default:
1056 BUG();
1057 }
1058 if (ptask->dest_node == IEEE1394_ALL_NODES) {
1059 u8 *p;
1060 int generation;
1061 int node_id;
1062
1063 /* ptask->generation may not have been set yet */
1064 generation = dev->card->generation;
1065 smp_rmb();
1066 node_id = dev->card->node_id;
1067
1068 p = skb_push(ptask->skb, IEEE1394_GASP_HDR_SIZE);
1069 put_unaligned_be32(node_id << 16 | IANA_SPECIFIER_ID >> 8, p);
1070 put_unaligned_be32((IANA_SPECIFIER_ID & 0xff) << 24
1071 | RFC2734_SW_VERSION, &p[4]);
1072
1073 /* We should not transmit if broadcast_channel.valid == 0. */
1074 fw_send_request(dev->card, &ptask->transaction,
1075 TCODE_STREAM_DATA,
1076 fw_stream_packet_destination_id(3,
1077 IEEE1394_BROADCAST_CHANNEL, 0),
1078 generation, SCODE_100, 0ULL, ptask->skb->data,
1079 tx_len + 8, fwnet_write_complete, ptask);
1080
1081 spin_lock_irqsave(&dev->lock, flags);
1082
1083 /* If the AT tasklet already ran, we may be last user. */
1084 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1085 if (!free)
1086 ptask->enqueued = true;
1087 else
1088 dec_queued_datagrams(dev);
1089
1090 spin_unlock_irqrestore(&dev->lock, flags);
1091
1092 goto out;
1093 }
1094
1095 fw_send_request(dev->card, &ptask->transaction,
1096 TCODE_WRITE_BLOCK_REQUEST, ptask->dest_node,
1097 ptask->generation, ptask->speed, ptask->fifo_addr,
1098 ptask->skb->data, tx_len, fwnet_write_complete, ptask);
1099
1100 spin_lock_irqsave(&dev->lock, flags);
1101
1102 /* If the AT tasklet already ran, we may be last user. */
1103 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1104 if (!free)
1105 ptask->enqueued = true;
1106 else
1107 dec_queued_datagrams(dev);
1108
1109 spin_unlock_irqrestore(&dev->lock, flags);
1110
1111 dev->netdev->trans_start = jiffies;
1112 out:
1113 if (free)
1114 fwnet_free_ptask(ptask);
1115
1116 return 0;
1117 }
1118
1119 static int fwnet_broadcast_start(struct fwnet_device *dev)
1120 {
1121 struct fw_iso_context *context;
1122 int retval;
1123 unsigned num_packets;
1124 unsigned max_receive;
1125 struct fw_iso_packet packet;
1126 unsigned long offset;
1127 unsigned u;
1128
1129 if (dev->local_fifo == FWNET_NO_FIFO_ADDR) {
1130 dev->handler.length = 4096;
1131 dev->handler.address_callback = fwnet_receive_packet;
1132 dev->handler.callback_data = dev;
1133
1134 retval = fw_core_add_address_handler(&dev->handler,
1135 &fw_high_memory_region);
1136 if (retval < 0)
1137 goto failed_initial;
1138
1139 dev->local_fifo = dev->handler.offset;
1140 }
1141
1142 max_receive = 1U << (dev->card->max_receive + 1);
1143 num_packets = (FWNET_ISO_PAGE_COUNT * PAGE_SIZE) / max_receive;
1144
1145 if (!dev->broadcast_rcv_context) {
1146 void **ptrptr;
1147
1148 context = fw_iso_context_create(dev->card,
1149 FW_ISO_CONTEXT_RECEIVE, IEEE1394_BROADCAST_CHANNEL,
1150 dev->card->link_speed, 8, fwnet_receive_broadcast, dev);
1151 if (IS_ERR(context)) {
1152 retval = PTR_ERR(context);
1153 goto failed_context_create;
1154 }
1155
1156 retval = fw_iso_buffer_init(&dev->broadcast_rcv_buffer,
1157 dev->card, FWNET_ISO_PAGE_COUNT, DMA_FROM_DEVICE);
1158 if (retval < 0)
1159 goto failed_buffer_init;
1160
1161 ptrptr = kmalloc(sizeof(void *) * num_packets, GFP_KERNEL);
1162 if (!ptrptr) {
1163 retval = -ENOMEM;
1164 goto failed_ptrs_alloc;
1165 }
1166
1167 dev->broadcast_rcv_buffer_ptrs = ptrptr;
1168 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++) {
1169 void *ptr;
1170 unsigned v;
1171
1172 ptr = kmap(dev->broadcast_rcv_buffer.pages[u]);
1173 for (v = 0; v < num_packets / FWNET_ISO_PAGE_COUNT; v++)
1174 *ptrptr++ = (void *)
1175 ((char *)ptr + v * max_receive);
1176 }
1177 dev->broadcast_rcv_context = context;
1178 } else {
1179 context = dev->broadcast_rcv_context;
1180 }
1181
1182 packet.payload_length = max_receive;
1183 packet.interrupt = 1;
1184 packet.skip = 0;
1185 packet.tag = 3;
1186 packet.sy = 0;
1187 packet.header_length = IEEE1394_GASP_HDR_SIZE;
1188 offset = 0;
1189
1190 for (u = 0; u < num_packets; u++) {
1191 retval = fw_iso_context_queue(context, &packet,
1192 &dev->broadcast_rcv_buffer, offset);
1193 if (retval < 0)
1194 goto failed_rcv_queue;
1195
1196 offset += max_receive;
1197 }
1198 dev->num_broadcast_rcv_ptrs = num_packets;
1199 dev->rcv_buffer_size = max_receive;
1200 dev->broadcast_rcv_next_ptr = 0U;
1201 retval = fw_iso_context_start(context, -1, 0,
1202 FW_ISO_CONTEXT_MATCH_ALL_TAGS); /* ??? sync */
1203 if (retval < 0)
1204 goto failed_rcv_queue;
1205
1206 /* FIXME: adjust it according to the min. speed of all known peers? */
1207 dev->broadcast_xmt_max_payload = IEEE1394_MAX_PAYLOAD_S100
1208 - IEEE1394_GASP_HDR_SIZE - RFC2374_UNFRAG_HDR_SIZE;
1209 dev->broadcast_state = FWNET_BROADCAST_RUNNING;
1210
1211 return 0;
1212
1213 failed_rcv_queue:
1214 kfree(dev->broadcast_rcv_buffer_ptrs);
1215 dev->broadcast_rcv_buffer_ptrs = NULL;
1216 failed_ptrs_alloc:
1217 fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer, dev->card);
1218 failed_buffer_init:
1219 fw_iso_context_destroy(context);
1220 dev->broadcast_rcv_context = NULL;
1221 failed_context_create:
1222 fw_core_remove_address_handler(&dev->handler);
1223 failed_initial:
1224 dev->local_fifo = FWNET_NO_FIFO_ADDR;
1225
1226 return retval;
1227 }
1228
1229 static void set_carrier_state(struct fwnet_device *dev)
1230 {
1231 if (dev->peer_count > 1)
1232 netif_carrier_on(dev->netdev);
1233 else
1234 netif_carrier_off(dev->netdev);
1235 }
1236
1237 /* ifup */
1238 static int fwnet_open(struct net_device *net)
1239 {
1240 struct fwnet_device *dev = netdev_priv(net);
1241 int ret;
1242
1243 if (dev->broadcast_state == FWNET_BROADCAST_ERROR) {
1244 ret = fwnet_broadcast_start(dev);
1245 if (ret)
1246 return ret;
1247 }
1248 netif_start_queue(net);
1249
1250 spin_lock_irq(&dev->lock);
1251 set_carrier_state(dev);
1252 spin_unlock_irq(&dev->lock);
1253
1254 return 0;
1255 }
1256
1257 /* ifdown */
1258 static int fwnet_stop(struct net_device *net)
1259 {
1260 netif_stop_queue(net);
1261
1262 /* Deallocate iso context for use by other applications? */
1263
1264 return 0;
1265 }
1266
1267 static netdev_tx_t fwnet_tx(struct sk_buff *skb, struct net_device *net)
1268 {
1269 struct fwnet_header hdr_buf;
1270 struct fwnet_device *dev = netdev_priv(net);
1271 __be16 proto;
1272 u16 dest_node;
1273 unsigned max_payload;
1274 u16 dg_size;
1275 u16 *datagram_label_ptr;
1276 struct fwnet_packet_task *ptask;
1277 struct fwnet_peer *peer;
1278 unsigned long flags;
1279
1280 spin_lock_irqsave(&dev->lock, flags);
1281
1282 /* Can this happen? */
1283 if (netif_queue_stopped(dev->netdev)) {
1284 spin_unlock_irqrestore(&dev->lock, flags);
1285
1286 return NETDEV_TX_BUSY;
1287 }
1288
1289 ptask = kmem_cache_alloc(fwnet_packet_task_cache, GFP_ATOMIC);
1290 if (ptask == NULL)
1291 goto fail;
1292
1293 skb = skb_share_check(skb, GFP_ATOMIC);
1294 if (!skb)
1295 goto fail;
1296
1297 /*
1298 * Make a copy of the driver-specific header.
1299 * We might need to rebuild the header on tx failure.
1300 */
1301 memcpy(&hdr_buf, skb->data, sizeof(hdr_buf));
1302 skb_pull(skb, sizeof(hdr_buf));
1303
1304 proto = hdr_buf.h_proto;
1305 dg_size = skb->len;
1306
1307 /*
1308 * Set the transmission type for the packet. ARP packets and IP
1309 * broadcast packets are sent via GASP.
1310 */
1311 if (memcmp(hdr_buf.h_dest, net->broadcast, FWNET_ALEN) == 0
1312 || proto == htons(ETH_P_ARP)
1313 || (proto == htons(ETH_P_IP)
1314 && IN_MULTICAST(ntohl(ip_hdr(skb)->daddr)))) {
1315 max_payload = dev->broadcast_xmt_max_payload;
1316 datagram_label_ptr = &dev->broadcast_xmt_datagramlabel;
1317
1318 ptask->fifo_addr = FWNET_NO_FIFO_ADDR;
1319 ptask->generation = 0;
1320 ptask->dest_node = IEEE1394_ALL_NODES;
1321 ptask->speed = SCODE_100;
1322 } else {
1323 __be64 guid = get_unaligned((__be64 *)hdr_buf.h_dest);
1324 u8 generation;
1325
1326 peer = fwnet_peer_find_by_guid(dev, be64_to_cpu(guid));
1327 if (!peer || peer->fifo == FWNET_NO_FIFO_ADDR)
1328 goto fail;
1329
1330 generation = peer->generation;
1331 dest_node = peer->node_id;
1332 max_payload = peer->max_payload;
1333 datagram_label_ptr = &peer->datagram_label;
1334
1335 ptask->fifo_addr = peer->fifo;
1336 ptask->generation = generation;
1337 ptask->dest_node = dest_node;
1338 ptask->speed = peer->speed;
1339 }
1340
1341 /* If this is an ARP packet, convert it */
1342 if (proto == htons(ETH_P_ARP)) {
1343 struct arphdr *arp = (struct arphdr *)skb->data;
1344 unsigned char *arp_ptr = (unsigned char *)(arp + 1);
1345 struct rfc2734_arp *arp1394 = (struct rfc2734_arp *)skb->data;
1346 __be32 ipaddr;
1347
1348 ipaddr = get_unaligned((__be32 *)(arp_ptr + FWNET_ALEN));
1349
1350 arp1394->hw_addr_len = RFC2734_HW_ADDR_LEN;
1351 arp1394->max_rec = dev->card->max_receive;
1352 arp1394->sspd = dev->card->link_speed;
1353
1354 put_unaligned_be16(dev->local_fifo >> 32,
1355 &arp1394->fifo_hi);
1356 put_unaligned_be32(dev->local_fifo & 0xffffffff,
1357 &arp1394->fifo_lo);
1358 put_unaligned(ipaddr, &arp1394->sip);
1359 }
1360
1361 ptask->hdr.w0 = 0;
1362 ptask->hdr.w1 = 0;
1363 ptask->skb = skb;
1364 ptask->dev = dev;
1365
1366 /* Does it all fit in one packet? */
1367 if (dg_size <= max_payload) {
1368 fwnet_make_uf_hdr(&ptask->hdr, ntohs(proto));
1369 ptask->outstanding_pkts = 1;
1370 max_payload = dg_size + RFC2374_UNFRAG_HDR_SIZE;
1371 } else {
1372 u16 datagram_label;
1373
1374 max_payload -= RFC2374_FRAG_OVERHEAD;
1375 datagram_label = (*datagram_label_ptr)++;
1376 fwnet_make_ff_hdr(&ptask->hdr, ntohs(proto), dg_size,
1377 datagram_label);
1378 ptask->outstanding_pkts = DIV_ROUND_UP(dg_size, max_payload);
1379 max_payload += RFC2374_FRAG_HDR_SIZE;
1380 }
1381
1382 if (++dev->queued_datagrams == FWNET_MAX_QUEUED_DATAGRAMS)
1383 netif_stop_queue(dev->netdev);
1384
1385 spin_unlock_irqrestore(&dev->lock, flags);
1386
1387 ptask->max_payload = max_payload;
1388 ptask->enqueued = 0;
1389
1390 fwnet_send_packet(ptask);
1391
1392 return NETDEV_TX_OK;
1393
1394 fail:
1395 spin_unlock_irqrestore(&dev->lock, flags);
1396
1397 if (ptask)
1398 kmem_cache_free(fwnet_packet_task_cache, ptask);
1399
1400 if (skb != NULL)
1401 dev_kfree_skb(skb);
1402
1403 net->stats.tx_dropped++;
1404 net->stats.tx_errors++;
1405
1406 /*
1407 * FIXME: According to a patch from 2003-02-26, "returning non-zero
1408 * causes serious problems" here, allegedly. Before that patch,
1409 * -ERRNO was returned which is not appropriate under Linux 2.6.
1410 * Perhaps more needs to be done? Stop the queue in serious
1411 * conditions and restart it elsewhere?
1412 */
1413 return NETDEV_TX_OK;
1414 }
1415
1416 static int fwnet_change_mtu(struct net_device *net, int new_mtu)
1417 {
1418 if (new_mtu < 68)
1419 return -EINVAL;
1420
1421 net->mtu = new_mtu;
1422 return 0;
1423 }
1424
1425 static const struct ethtool_ops fwnet_ethtool_ops = {
1426 .get_link = ethtool_op_get_link,
1427 };
1428
1429 static const struct net_device_ops fwnet_netdev_ops = {
1430 .ndo_open = fwnet_open,
1431 .ndo_stop = fwnet_stop,
1432 .ndo_start_xmit = fwnet_tx,
1433 .ndo_change_mtu = fwnet_change_mtu,
1434 };
1435
1436 static void fwnet_init_dev(struct net_device *net)
1437 {
1438 net->header_ops = &fwnet_header_ops;
1439 net->netdev_ops = &fwnet_netdev_ops;
1440 net->watchdog_timeo = 2 * HZ;
1441 net->flags = IFF_BROADCAST | IFF_MULTICAST;
1442 net->features = NETIF_F_HIGHDMA;
1443 net->addr_len = FWNET_ALEN;
1444 net->hard_header_len = FWNET_HLEN;
1445 net->type = ARPHRD_IEEE1394;
1446 net->tx_queue_len = FWNET_TX_QUEUE_LEN;
1447 net->ethtool_ops = &fwnet_ethtool_ops;
1448 }
1449
1450 /* caller must hold fwnet_device_mutex */
1451 static struct fwnet_device *fwnet_dev_find(struct fw_card *card)
1452 {
1453 struct fwnet_device *dev;
1454
1455 list_for_each_entry(dev, &fwnet_device_list, dev_link)
1456 if (dev->card == card)
1457 return dev;
1458
1459 return NULL;
1460 }
1461
1462 static int fwnet_add_peer(struct fwnet_device *dev,
1463 struct fw_unit *unit, struct fw_device *device)
1464 {
1465 struct fwnet_peer *peer;
1466
1467 peer = kmalloc(sizeof(*peer), GFP_KERNEL);
1468 if (!peer)
1469 return -ENOMEM;
1470
1471 dev_set_drvdata(&unit->device, peer);
1472
1473 peer->dev = dev;
1474 peer->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4];
1475 peer->fifo = FWNET_NO_FIFO_ADDR;
1476 peer->ip = 0;
1477 INIT_LIST_HEAD(&peer->pd_list);
1478 peer->pdg_size = 0;
1479 peer->datagram_label = 0;
1480 peer->speed = device->max_speed;
1481 peer->max_payload = fwnet_max_payload(device->max_rec, peer->speed);
1482
1483 peer->generation = device->generation;
1484 smp_rmb();
1485 peer->node_id = device->node_id;
1486
1487 spin_lock_irq(&dev->lock);
1488 list_add_tail(&peer->peer_link, &dev->peer_list);
1489 dev->peer_count++;
1490 set_carrier_state(dev);
1491 spin_unlock_irq(&dev->lock);
1492
1493 return 0;
1494 }
1495
1496 static int fwnet_probe(struct device *_dev)
1497 {
1498 struct fw_unit *unit = fw_unit(_dev);
1499 struct fw_device *device = fw_parent_device(unit);
1500 struct fw_card *card = device->card;
1501 struct net_device *net;
1502 bool allocated_netdev = false;
1503 struct fwnet_device *dev;
1504 unsigned max_mtu;
1505 int ret;
1506
1507 mutex_lock(&fwnet_device_mutex);
1508
1509 dev = fwnet_dev_find(card);
1510 if (dev) {
1511 net = dev->netdev;
1512 goto have_dev;
1513 }
1514
1515 net = alloc_netdev(sizeof(*dev), "firewire%d", fwnet_init_dev);
1516 if (net == NULL) {
1517 ret = -ENOMEM;
1518 goto out;
1519 }
1520
1521 allocated_netdev = true;
1522 SET_NETDEV_DEV(net, card->device);
1523 dev = netdev_priv(net);
1524
1525 spin_lock_init(&dev->lock);
1526 dev->broadcast_state = FWNET_BROADCAST_ERROR;
1527 dev->broadcast_rcv_context = NULL;
1528 dev->broadcast_xmt_max_payload = 0;
1529 dev->broadcast_xmt_datagramlabel = 0;
1530 dev->local_fifo = FWNET_NO_FIFO_ADDR;
1531 dev->queued_datagrams = 0;
1532 INIT_LIST_HEAD(&dev->peer_list);
1533 dev->card = card;
1534 dev->netdev = net;
1535
1536 /*
1537 * Use the RFC 2734 default 1500 octets or the maximum payload
1538 * as initial MTU
1539 */
1540 max_mtu = (1 << (card->max_receive + 1))
1541 - sizeof(struct rfc2734_header) - IEEE1394_GASP_HDR_SIZE;
1542 net->mtu = min(1500U, max_mtu);
1543
1544 /* Set our hardware address while we're at it */
1545 put_unaligned_be64(card->guid, net->dev_addr);
1546 put_unaligned_be64(~0ULL, net->broadcast);
1547 ret = register_netdev(net);
1548 if (ret)
1549 goto out;
1550
1551 list_add_tail(&dev->dev_link, &fwnet_device_list);
1552 dev_notice(&net->dev, "IPv4 over IEEE 1394 on card %s\n",
1553 dev_name(card->device));
1554 have_dev:
1555 ret = fwnet_add_peer(dev, unit, device);
1556 if (ret && allocated_netdev) {
1557 unregister_netdev(net);
1558 list_del(&dev->dev_link);
1559 }
1560 out:
1561 if (ret && allocated_netdev)
1562 free_netdev(net);
1563
1564 mutex_unlock(&fwnet_device_mutex);
1565
1566 return ret;
1567 }
1568
1569 static void fwnet_remove_peer(struct fwnet_peer *peer, struct fwnet_device *dev)
1570 {
1571 struct fwnet_partial_datagram *pd, *pd_next;
1572
1573 spin_lock_irq(&dev->lock);
1574 list_del(&peer->peer_link);
1575 dev->peer_count--;
1576 set_carrier_state(dev);
1577 spin_unlock_irq(&dev->lock);
1578
1579 list_for_each_entry_safe(pd, pd_next, &peer->pd_list, pd_link)
1580 fwnet_pd_delete(pd);
1581
1582 kfree(peer);
1583 }
1584
1585 static int fwnet_remove(struct device *_dev)
1586 {
1587 struct fwnet_peer *peer = dev_get_drvdata(_dev);
1588 struct fwnet_device *dev = peer->dev;
1589 struct net_device *net;
1590 int i;
1591
1592 mutex_lock(&fwnet_device_mutex);
1593
1594 net = dev->netdev;
1595 if (net && peer->ip)
1596 arp_invalidate(net, peer->ip);
1597
1598 fwnet_remove_peer(peer, dev);
1599
1600 if (list_empty(&dev->peer_list)) {
1601 unregister_netdev(net);
1602
1603 if (dev->local_fifo != FWNET_NO_FIFO_ADDR)
1604 fw_core_remove_address_handler(&dev->handler);
1605 if (dev->broadcast_rcv_context) {
1606 fw_iso_context_stop(dev->broadcast_rcv_context);
1607 fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer,
1608 dev->card);
1609 fw_iso_context_destroy(dev->broadcast_rcv_context);
1610 }
1611 for (i = 0; dev->queued_datagrams && i < 5; i++)
1612 ssleep(1);
1613 WARN_ON(dev->queued_datagrams);
1614 list_del(&dev->dev_link);
1615
1616 free_netdev(net);
1617 }
1618
1619 mutex_unlock(&fwnet_device_mutex);
1620
1621 return 0;
1622 }
1623
1624 /*
1625 * FIXME abort partially sent fragmented datagrams,
1626 * discard partially received fragmented datagrams
1627 */
1628 static void fwnet_update(struct fw_unit *unit)
1629 {
1630 struct fw_device *device = fw_parent_device(unit);
1631 struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1632 int generation;
1633
1634 generation = device->generation;
1635
1636 spin_lock_irq(&peer->dev->lock);
1637 peer->node_id = device->node_id;
1638 peer->generation = generation;
1639 spin_unlock_irq(&peer->dev->lock);
1640 }
1641
1642 static const struct ieee1394_device_id fwnet_id_table[] = {
1643 {
1644 .match_flags = IEEE1394_MATCH_SPECIFIER_ID |
1645 IEEE1394_MATCH_VERSION,
1646 .specifier_id = IANA_SPECIFIER_ID,
1647 .version = RFC2734_SW_VERSION,
1648 },
1649 { }
1650 };
1651
1652 static struct fw_driver fwnet_driver = {
1653 .driver = {
1654 .owner = THIS_MODULE,
1655 .name = KBUILD_MODNAME,
1656 .bus = &fw_bus_type,
1657 .probe = fwnet_probe,
1658 .remove = fwnet_remove,
1659 },
1660 .update = fwnet_update,
1661 .id_table = fwnet_id_table,
1662 };
1663
1664 static const u32 rfc2374_unit_directory_data[] = {
1665 0x00040000, /* directory_length */
1666 0x1200005e, /* unit_specifier_id: IANA */
1667 0x81000003, /* textual descriptor offset */
1668 0x13000001, /* unit_sw_version: RFC 2734 */
1669 0x81000005, /* textual descriptor offset */
1670 0x00030000, /* descriptor_length */
1671 0x00000000, /* text */
1672 0x00000000, /* minimal ASCII, en */
1673 0x49414e41, /* I A N A */
1674 0x00030000, /* descriptor_length */
1675 0x00000000, /* text */
1676 0x00000000, /* minimal ASCII, en */
1677 0x49507634, /* I P v 4 */
1678 };
1679
1680 static struct fw_descriptor rfc2374_unit_directory = {
1681 .length = ARRAY_SIZE(rfc2374_unit_directory_data),
1682 .key = (CSR_DIRECTORY | CSR_UNIT) << 24,
1683 .data = rfc2374_unit_directory_data
1684 };
1685
1686 static int __init fwnet_init(void)
1687 {
1688 int err;
1689
1690 err = fw_core_add_descriptor(&rfc2374_unit_directory);
1691 if (err)
1692 return err;
1693
1694 fwnet_packet_task_cache = kmem_cache_create("packet_task",
1695 sizeof(struct fwnet_packet_task), 0, 0, NULL);
1696 if (!fwnet_packet_task_cache) {
1697 err = -ENOMEM;
1698 goto out;
1699 }
1700
1701 err = driver_register(&fwnet_driver.driver);
1702 if (!err)
1703 return 0;
1704
1705 kmem_cache_destroy(fwnet_packet_task_cache);
1706 out:
1707 fw_core_remove_descriptor(&rfc2374_unit_directory);
1708
1709 return err;
1710 }
1711 module_init(fwnet_init);
1712
1713 static void __exit fwnet_cleanup(void)
1714 {
1715 driver_unregister(&fwnet_driver.driver);
1716 kmem_cache_destroy(fwnet_packet_task_cache);
1717 fw_core_remove_descriptor(&rfc2374_unit_directory);
1718 }
1719 module_exit(fwnet_cleanup);
1720
1721 MODULE_AUTHOR("Jay Fenlason <fenlason@redhat.com>");
1722 MODULE_DESCRIPTION("IPv4 over IEEE1394 as per RFC 2734");
1723 MODULE_LICENSE("GPL");
1724 MODULE_DEVICE_TABLE(ieee1394, fwnet_id_table);
Linux with added FPC-III support