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GUI: Fix Tomato RAF theme for all builds. Compilation typo.
[tomato.git] / release / src-rt-6.x.4708 / linux / linux-2.6.36 / drivers / firewire / net.c
blob40cd1a07210d7b0cab5180f5e5d9004242145e0b
1 /*
2 * IPv4 over IEEE 1394, per RFC 2734
3 *
4 * Copyright (C) 2009 Jay Fenlason <fenlason@redhat.com>
5 *
6 * based on eth1394 by Ben Collins et al
7 */
8
9 #include <linux/bug.h>
10 #include <linux/device.h>
11 #include <linux/ethtool.h>
12 #include <linux/firewire.h>
13 #include <linux/firewire-constants.h>
14 #include <linux/highmem.h>
15 #include <linux/in.h>
16 #include <linux/ip.h>
17 #include <linux/jiffies.h>
18 #include <linux/mod_devicetable.h>
19 #include <linux/module.h>
20 #include <linux/moduleparam.h>
21 #include <linux/mutex.h>
22 #include <linux/netdevice.h>
23 #include <linux/skbuff.h>
24 #include <linux/slab.h>
25 #include <linux/spinlock.h>
26
27 #include <asm/unaligned.h>
28 #include <net/arp.h>
29
30 #define FWNET_MAX_FRAGMENTS 25 /* arbitrary limit */
31 #define FWNET_ISO_PAGE_COUNT (PAGE_SIZE < 16 * 1024 ? 4 : 2)
32
33 #define IEEE1394_BROADCAST_CHANNEL 31
34 #define IEEE1394_ALL_NODES (0xffc0 | 0x003f)
35 #define IEEE1394_MAX_PAYLOAD_S100 512
36 #define FWNET_NO_FIFO_ADDR (~0ULL)
37
38 #define IANA_SPECIFIER_ID 0x00005eU
39 #define RFC2734_SW_VERSION 0x000001U
40
41 #define IEEE1394_GASP_HDR_SIZE 8
42
43 #define RFC2374_UNFRAG_HDR_SIZE 4
44 #define RFC2374_FRAG_HDR_SIZE 8
45 #define RFC2374_FRAG_OVERHEAD 4
46
47 #define RFC2374_HDR_UNFRAG 0 /* unfragmented */
48 #define RFC2374_HDR_FIRSTFRAG 1 /* first fragment */
49 #define RFC2374_HDR_LASTFRAG 2 /* last fragment */
50 #define RFC2374_HDR_INTFRAG 3 /* interior fragment */
51
52 #define RFC2734_HW_ADDR_LEN 16
53
54 struct rfc2734_arp {
55 __be16 hw_type; /* 0x0018 */
56 __be16 proto_type; /* 0x0806 */
57 u8 hw_addr_len; /* 16 */
58 u8 ip_addr_len; /* 4 */
59 __be16 opcode; /* ARP Opcode */
60 /* Above is exactly the same format as struct arphdr */
61
62 __be64 s_uniq_id; /* Sender's 64bit EUI */
63 u8 max_rec; /* Sender's max packet size */
64 u8 sspd; /* Sender's max speed */
65 __be16 fifo_hi; /* hi 16bits of sender's FIFO addr */
66 __be32 fifo_lo; /* lo 32bits of sender's FIFO addr */
67 __be32 sip; /* Sender's IP Address */
68 __be32 tip; /* IP Address of requested hw addr */
69 } __attribute__((packed));
70
71 /* This header format is specific to this driver implementation. */
72 #define FWNET_ALEN 8
73 #define FWNET_HLEN 10
74 struct fwnet_header {
75 u8 h_dest[FWNET_ALEN]; /* destination address */
76 __be16 h_proto; /* packet type ID field */
77 } __attribute__((packed));
78
79 /* IPv4 and IPv6 encapsulation header */
80 struct rfc2734_header {
81 u32 w0;
82 u32 w1;
83 };
84
85 #define fwnet_get_hdr_lf(h) (((h)->w0 & 0xc0000000) >> 30)
86 #define fwnet_get_hdr_ether_type(h) (((h)->w0 & 0x0000ffff))
87 #define fwnet_get_hdr_dg_size(h) (((h)->w0 & 0x0fff0000) >> 16)
88 #define fwnet_get_hdr_fg_off(h) (((h)->w0 & 0x00000fff))
89 #define fwnet_get_hdr_dgl(h) (((h)->w1 & 0xffff0000) >> 16)
90
91 #define fwnet_set_hdr_lf(lf) ((lf) << 30)
92 #define fwnet_set_hdr_ether_type(et) (et)
93 #define fwnet_set_hdr_dg_size(dgs) ((dgs) << 16)
94 #define fwnet_set_hdr_fg_off(fgo) (fgo)
95
96 #define fwnet_set_hdr_dgl(dgl) ((dgl) << 16)
97
98 static inline void fwnet_make_uf_hdr(struct rfc2734_header *hdr,
99 unsigned ether_type)
100 {
101 hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_UNFRAG)
102 | fwnet_set_hdr_ether_type(ether_type);
103 }
104
105 static inline void fwnet_make_ff_hdr(struct rfc2734_header *hdr,
106 unsigned ether_type, unsigned dg_size, unsigned dgl)
107 {
108 hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_FIRSTFRAG)
109 | fwnet_set_hdr_dg_size(dg_size)
110 | fwnet_set_hdr_ether_type(ether_type);
111 hdr->w1 = fwnet_set_hdr_dgl(dgl);
112 }
113
114 static inline void fwnet_make_sf_hdr(struct rfc2734_header *hdr,
115 unsigned lf, unsigned dg_size, unsigned fg_off, unsigned dgl)
116 {
117 hdr->w0 = fwnet_set_hdr_lf(lf)
118 | fwnet_set_hdr_dg_size(dg_size)
119 | fwnet_set_hdr_fg_off(fg_off);
120 hdr->w1 = fwnet_set_hdr_dgl(dgl);
121 }
122
123 /* This list keeps track of what parts of the datagram have been filled in */
124 struct fwnet_fragment_info {
125 struct list_head fi_link;
126 u16 offset;
127 u16 len;
128 };
129
130 struct fwnet_partial_datagram {
131 struct list_head pd_link;
132 struct list_head fi_list;
133 struct sk_buff *skb;
134 char *pbuf;
135 u16 datagram_label;
136 u16 ether_type;
137 u16 datagram_size;
138 };
139
140 static DEFINE_MUTEX(fwnet_device_mutex);
141 static LIST_HEAD(fwnet_device_list);
142
143 struct fwnet_device {
144 struct list_head dev_link;
145 spinlock_t lock;
146 enum {
147 FWNET_BROADCAST_ERROR,
148 FWNET_BROADCAST_RUNNING,
149 FWNET_BROADCAST_STOPPED,
150 } broadcast_state;
151 struct fw_iso_context *broadcast_rcv_context;
152 struct fw_iso_buffer broadcast_rcv_buffer;
153 void **broadcast_rcv_buffer_ptrs;
154 unsigned broadcast_rcv_next_ptr;
155 unsigned num_broadcast_rcv_ptrs;
156 unsigned rcv_buffer_size;
157 /*
158 * This value is the maximum unfragmented datagram size that can be
159 * sent by the hardware. It already has the GASP overhead and the
160 * unfragmented datagram header overhead calculated into it.
161 */
162 unsigned broadcast_xmt_max_payload;
163 u16 broadcast_xmt_datagramlabel;
164
165 /*
166 * The CSR address that remote nodes must send datagrams to for us to
167 * receive them.
168 */
169 struct fw_address_handler handler;
170 u64 local_fifo;
171
172 /* List of packets to be sent */
173 struct list_head packet_list;
174 /*
175 * List of packets that were broadcasted. When we get an ISO interrupt
176 * one of them has been sent
177 */
178 struct list_head broadcasted_list;
179 /* List of packets that have been sent but not yet acked */
180 struct list_head sent_list;
181
182 struct list_head peer_list;
183 struct fw_card *card;
184 struct net_device *netdev;
185 };
186
187 struct fwnet_peer {
188 struct list_head peer_link;
189 struct fwnet_device *dev;
190 u64 guid;
191 u64 fifo;
192
193 /* guarded by dev->lock */
194 struct list_head pd_list; /* received partial datagrams */
195 unsigned pdg_size; /* pd_list size */
196
197 u16 datagram_label; /* outgoing datagram label */
198 unsigned max_payload; /* includes RFC2374_FRAG_HDR_SIZE overhead */
199 int node_id;
200 int generation;
201 unsigned speed;
202 };
203
204 /* This is our task struct. It's used for the packet complete callback. */
205 struct fwnet_packet_task {
206 /*
207 * ptask can actually be on dev->packet_list, dev->broadcasted_list,
208 * or dev->sent_list depending on its current state.
209 */
210 struct list_head pt_link;
211 struct fw_transaction transaction;
212 struct rfc2734_header hdr;
213 struct sk_buff *skb;
214 struct fwnet_device *dev;
215
216 int outstanding_pkts;
217 unsigned max_payload;
218 u64 fifo_addr;
219 u16 dest_node;
220 u8 generation;
221 u8 speed;
222 };
223
224 /*
225 * saddr == NULL means use device source address.
226 * daddr == NULL means leave destination address (eg unresolved arp).
227 */
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 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
264 static int fwnet_header_cache(const struct neighbour *neigh,
265 struct hh_cache *hh)
266 {
267 struct net_device *net;
268 struct fwnet_header *h;
269
270 if (hh->hh_type == cpu_to_be16(ETH_P_802_3))
271 return -1;
272 net = neigh->dev;
273 h = (struct fwnet_header *)((u8 *)hh->hh_data + 16 - sizeof(*h));
274 h->h_proto = hh->hh_type;
275 memcpy(h->h_dest, neigh->ha, net->addr_len);
276 hh->hh_len = FWNET_HLEN;
277
278 return 0;
279 }
280
281 /* Called by Address Resolution module to notify changes in address. */
282 static void fwnet_header_cache_update(struct hh_cache *hh,
283 const struct net_device *net, const unsigned char *haddr)
284 {
285 memcpy((u8 *)hh->hh_data + 16 - FWNET_HLEN, haddr, net->addr_len);
286 }
287
288 static int fwnet_header_parse(const struct sk_buff *skb, unsigned char *haddr)
289 {
290 memcpy(haddr, skb->dev->dev_addr, FWNET_ALEN);
291
292 return FWNET_ALEN;
293 }
294
295 static const struct header_ops fwnet_header_ops = {
296 .create = fwnet_header_create,
297 .rebuild = fwnet_header_rebuild,
298 .cache = fwnet_header_cache,
299 .cache_update = fwnet_header_cache_update,
300 .parse = fwnet_header_parse,
301 };
302
303 static bool fwnet_frag_overlap(struct fwnet_partial_datagram *pd,
304 unsigned offset, unsigned len)
305 {
306 struct fwnet_fragment_info *fi;
307 unsigned end = offset + len;
308
309 list_for_each_entry(fi, &pd->fi_list, fi_link)
310 if (offset < fi->offset + fi->len && end > fi->offset)
311 return true;
312
313 return false;
314 }
315
316 /* Assumes that new fragment does not overlap any existing fragments */
317 static struct fwnet_fragment_info *fwnet_frag_new(
318 struct fwnet_partial_datagram *pd, unsigned offset, unsigned len)
319 {
320 struct fwnet_fragment_info *fi, *fi2, *new;
321 struct list_head *list;
322
323 list = &pd->fi_list;
324 list_for_each_entry(fi, &pd->fi_list, fi_link) {
325 if (fi->offset + fi->len == offset) {
326 /* The new fragment can be tacked on to the end */
327 /* Did the new fragment plug a hole? */
328 fi2 = list_entry(fi->fi_link.next,
329 struct fwnet_fragment_info, fi_link);
330 if (fi->offset + fi->len == fi2->offset) {
331 /* glue fragments together */
332 fi->len += len + fi2->len;
333 list_del(&fi2->fi_link);
334 kfree(fi2);
335 } else {
336 fi->len += len;
337 }
338
339 return fi;
340 }
341 if (offset + len == fi->offset) {
342 /* The new fragment can be tacked on to the beginning */
343 /* Did the new fragment plug a hole? */
344 fi2 = list_entry(fi->fi_link.prev,
345 struct fwnet_fragment_info, fi_link);
346 if (fi2->offset + fi2->len == fi->offset) {
347 /* glue fragments together */
348 fi2->len += fi->len + len;
349 list_del(&fi->fi_link);
350 kfree(fi);
351
352 return fi2;
353 }
354 fi->offset = offset;
355 fi->len += len;
356
357 return fi;
358 }
359 if (offset > fi->offset + fi->len) {
360 list = &fi->fi_link;
361 break;
362 }
363 if (offset + len < fi->offset) {
364 list = fi->fi_link.prev;
365 break;
366 }
367 }
368
369 new = kmalloc(sizeof(*new), GFP_ATOMIC);
370 if (!new) {
371 fw_error("out of memory\n");
372 return NULL;
373 }
374
375 new->offset = offset;
376 new->len = len;
377 list_add(&new->fi_link, list);
378
379 return new;
380 }
381
382 static struct fwnet_partial_datagram *fwnet_pd_new(struct net_device *net,
383 struct fwnet_peer *peer, u16 datagram_label, unsigned dg_size,
384 void *frag_buf, unsigned frag_off, unsigned frag_len)
385 {
386 struct fwnet_partial_datagram *new;
387 struct fwnet_fragment_info *fi;
388
389 new = kmalloc(sizeof(*new), GFP_ATOMIC);
390 if (!new)
391 goto fail;
392
393 INIT_LIST_HEAD(&new->fi_list);
394 fi = fwnet_frag_new(new, frag_off, frag_len);
395 if (fi == NULL)
396 goto fail_w_new;
397
398 new->datagram_label = datagram_label;
399 new->datagram_size = dg_size;
400 new->skb = dev_alloc_skb(dg_size + net->hard_header_len + 15);
401 if (new->skb == NULL)
402 goto fail_w_fi;
403
404 skb_reserve(new->skb, (net->hard_header_len + 15) & ~15);
405 new->pbuf = skb_put(new->skb, dg_size);
406 memcpy(new->pbuf + frag_off, frag_buf, frag_len);
407 list_add_tail(&new->pd_link, &peer->pd_list);
408
409 return new;
410
411 fail_w_fi:
412 kfree(fi);
413 fail_w_new:
414 kfree(new);
415 fail:
416 fw_error("out of memory\n");
417
418 return NULL;
419 }
420
421 static struct fwnet_partial_datagram *fwnet_pd_find(struct fwnet_peer *peer,
422 u16 datagram_label)
423 {
424 struct fwnet_partial_datagram *pd;
425
426 list_for_each_entry(pd, &peer->pd_list, pd_link)
427 if (pd->datagram_label == datagram_label)
428 return pd;
429
430 return NULL;
431 }
432
433
434 static void fwnet_pd_delete(struct fwnet_partial_datagram *old)
435 {
436 struct fwnet_fragment_info *fi, *n;
437
438 list_for_each_entry_safe(fi, n, &old->fi_list, fi_link)
439 kfree(fi);
440
441 list_del(&old->pd_link);
442 dev_kfree_skb_any(old->skb);
443 kfree(old);
444 }
445
446 static bool fwnet_pd_update(struct fwnet_peer *peer,
447 struct fwnet_partial_datagram *pd, void *frag_buf,
448 unsigned frag_off, unsigned frag_len)
449 {
450 if (fwnet_frag_new(pd, frag_off, frag_len) == NULL)
451 return false;
452
453 memcpy(pd->pbuf + frag_off, frag_buf, frag_len);
454
455 /*
456 * Move list entry to beginnig of list so that oldest partial
457 * datagrams percolate to the end of the list
458 */
459 list_move_tail(&pd->pd_link, &peer->pd_list);
460
461 return true;
462 }
463
464 static bool fwnet_pd_is_complete(struct fwnet_partial_datagram *pd)
465 {
466 struct fwnet_fragment_info *fi;
467
468 fi = list_entry(pd->fi_list.next, struct fwnet_fragment_info, fi_link);
469
470 return fi->len == pd->datagram_size;
471 }
472
473 /* caller must hold dev->lock */
474 static struct fwnet_peer *fwnet_peer_find_by_guid(struct fwnet_device *dev,
475 u64 guid)
476 {
477 struct fwnet_peer *peer;
478
479 list_for_each_entry(peer, &dev->peer_list, peer_link)
480 if (peer->guid == guid)
481 return peer;
482
483 return NULL;
484 }
485
486 /* caller must hold dev->lock */
487 static struct fwnet_peer *fwnet_peer_find_by_node_id(struct fwnet_device *dev,
488 int node_id, int generation)
489 {
490 struct fwnet_peer *peer;
491
492 list_for_each_entry(peer, &dev->peer_list, peer_link)
493 if (peer->node_id == node_id &&
494 peer->generation == generation)
495 return peer;
496
497 return NULL;
498 }
499
500 /* See IEEE 1394-2008 table 6-4, table 8-8, table 16-18. */
501 static unsigned fwnet_max_payload(unsigned max_rec, unsigned speed)
502 {
503 max_rec = min(max_rec, speed + 8);
504 max_rec = min(max_rec, 0xbU); /* <= 4096 */
505 if (max_rec < 8) {
506 fw_notify("max_rec %x out of range\n", max_rec);
507 max_rec = 8;
508 }
509
510 return (1 << (max_rec + 1)) - RFC2374_FRAG_HDR_SIZE;
511 }
512
513
514 static int fwnet_finish_incoming_packet(struct net_device *net,
515 struct sk_buff *skb, u16 source_node_id,
516 bool is_broadcast, u16 ether_type)
517 {
518 struct fwnet_device *dev;
519 static const __be64 broadcast_hw = cpu_to_be64(~0ULL);
520 int status;
521 __be64 guid;
522
523 dev = netdev_priv(net);
524 /* Write metadata, and then pass to the receive level */
525 skb->dev = net;
526 skb->ip_summed = CHECKSUM_UNNECESSARY; /* don't check it */
527
528 /*
529 * Parse the encapsulation header. This actually does the job of
530 * converting to an ethernet frame header, as well as arp
531 * conversion if needed. ARP conversion is easier in this
532 * direction, since we are using ethernet as our backend.
533 */
534 /*
535 * If this is an ARP packet, convert it. First, we want to make
536 * use of some of the fields, since they tell us a little bit
537 * about the sending machine.
538 */
539 if (ether_type == ETH_P_ARP) {
540 struct rfc2734_arp *arp1394;
541 struct arphdr *arp;
542 unsigned char *arp_ptr;
543 u64 fifo_addr;
544 u64 peer_guid;
545 unsigned sspd;
546 u16 max_payload;
547 struct fwnet_peer *peer;
548 unsigned long flags;
549
550 arp1394 = (struct rfc2734_arp *)skb->data;
551 arp = (struct arphdr *)skb->data;
552 arp_ptr = (unsigned char *)(arp + 1);
553 peer_guid = get_unaligned_be64(&arp1394->s_uniq_id);
554 fifo_addr = (u64)get_unaligned_be16(&arp1394->fifo_hi) << 32
555 | get_unaligned_be32(&arp1394->fifo_lo);
556
557 sspd = arp1394->sspd;
558 /* Sanity check. OS X 10.3 PPC reportedly sends 131. */
559 if (sspd > SCODE_3200) {
560 fw_notify("sspd %x out of range\n", sspd);
561 sspd = SCODE_3200;
562 }
563 max_payload = fwnet_max_payload(arp1394->max_rec, sspd);
564
565 spin_lock_irqsave(&dev->lock, flags);
566 peer = fwnet_peer_find_by_guid(dev, peer_guid);
567 if (peer) {
568 peer->fifo = fifo_addr;
569
570 if (peer->speed > sspd)
571 peer->speed = sspd;
572 if (peer->max_payload > max_payload)
573 peer->max_payload = max_payload;
574 }
575 spin_unlock_irqrestore(&dev->lock, flags);
576
577 if (!peer) {
578 fw_notify("No peer for ARP packet from %016llx\n",
579 (unsigned long long)peer_guid);
580 goto no_peer;
581 }
582
583 /*
584 * Now that we're done with the 1394 specific stuff, we'll
585 * need to alter some of the data. Believe it or not, all
586 * that needs to be done is sender_IP_address needs to be
587 * moved, the destination hardware address get stuffed
588 * in and the hardware address length set to 8.
589 *
590 * IMPORTANT: The code below overwrites 1394 specific data
591 * needed above so keep the munging of the data for the
592 * higher level IP stack last.
593 */
594
595 arp->ar_hln = 8;
596 /* skip over sender unique id */
597 arp_ptr += arp->ar_hln;
598 /* move sender IP addr */
599 put_unaligned(arp1394->sip, (u32 *)arp_ptr);
600 /* skip over sender IP addr */
601 arp_ptr += arp->ar_pln;
602
603 if (arp->ar_op == htons(ARPOP_REQUEST))
604 memset(arp_ptr, 0, sizeof(u64));
605 else
606 memcpy(arp_ptr, net->dev_addr, sizeof(u64));
607 }
608
609 /* Now add the ethernet header. */
610 guid = cpu_to_be64(dev->card->guid);
611 if (dev_hard_header(skb, net, ether_type,
612 is_broadcast ? &broadcast_hw : &guid,
613 NULL, skb->len) >= 0) {
614 struct fwnet_header *eth;
615 u16 *rawp;
616 __be16 protocol;
617
618 skb_reset_mac_header(skb);
619 skb_pull(skb, sizeof(*eth));
620 eth = (struct fwnet_header *)skb_mac_header(skb);
621 if (*eth->h_dest & 1) {
622 if (memcmp(eth->h_dest, net->broadcast,
623 net->addr_len) == 0)
624 skb->pkt_type = PACKET_BROADCAST;
625 } else {
626 if (memcmp(eth->h_dest, net->dev_addr, net->addr_len))
627 skb->pkt_type = PACKET_OTHERHOST;
628 }
629 if (ntohs(eth->h_proto) >= 1536) {
630 protocol = eth->h_proto;
631 } else {
632 rawp = (u16 *)skb->data;
633 if (*rawp == 0xffff)
634 protocol = htons(ETH_P_802_3);
635 else
636 protocol = htons(ETH_P_802_2);
637 }
638 skb->protocol = protocol;
639 }
640 status = netif_rx(skb);
641 if (status == NET_RX_DROP) {
642 net->stats.rx_errors++;
643 net->stats.rx_dropped++;
644 } else {
645 net->stats.rx_packets++;
646 net->stats.rx_bytes += skb->len;
647 }
648 if (netif_queue_stopped(net))
649 netif_wake_queue(net);
650
651 return 0;
652
653 no_peer:
654 net->stats.rx_errors++;
655 net->stats.rx_dropped++;
656
657 dev_kfree_skb_any(skb);
658 if (netif_queue_stopped(net))
659 netif_wake_queue(net);
660
661 return -ENOENT;
662 }
663
664 static int fwnet_incoming_packet(struct fwnet_device *dev, __be32 *buf, int len,
665 int source_node_id, int generation,
666 bool is_broadcast)
667 {
668 struct sk_buff *skb;
669 struct net_device *net = dev->netdev;
670 struct rfc2734_header hdr;
671 unsigned lf;
672 unsigned long flags;
673 struct fwnet_peer *peer;
674 struct fwnet_partial_datagram *pd;
675 int fg_off;
676 int dg_size;
677 u16 datagram_label;
678 int retval;
679 u16 ether_type;
680
681 hdr.w0 = be32_to_cpu(buf[0]);
682 lf = fwnet_get_hdr_lf(&hdr);
683 if (lf == RFC2374_HDR_UNFRAG) {
684 /*
685 * An unfragmented datagram has been received by the ieee1394
686 * bus. Build an skbuff around it so we can pass it to the
687 * high level network layer.
688 */
689 ether_type = fwnet_get_hdr_ether_type(&hdr);
690 buf++;
691 len -= RFC2374_UNFRAG_HDR_SIZE;
692
693 skb = dev_alloc_skb(len + net->hard_header_len + 15);
694 if (unlikely(!skb)) {
695 fw_error("out of memory\n");
696 net->stats.rx_dropped++;
697
698 return -ENOMEM;
699 }
700 skb_reserve(skb, (net->hard_header_len + 15) & ~15);
701 memcpy(skb_put(skb, len), buf, len);
702
703 return fwnet_finish_incoming_packet(net, skb, source_node_id,
704 is_broadcast, ether_type);
705 }
706 /* A datagram fragment has been received, now the fun begins. */
707 hdr.w1 = ntohl(buf[1]);
708 buf += 2;
709 len -= RFC2374_FRAG_HDR_SIZE;
710 if (lf == RFC2374_HDR_FIRSTFRAG) {
711 ether_type = fwnet_get_hdr_ether_type(&hdr);
712 fg_off = 0;
713 } else {
714 ether_type = 0;
715 fg_off = fwnet_get_hdr_fg_off(&hdr);
716 }
717 datagram_label = fwnet_get_hdr_dgl(&hdr);
718 dg_size = fwnet_get_hdr_dg_size(&hdr); /* ??? + 1 */
719
720 spin_lock_irqsave(&dev->lock, flags);
721
722 peer = fwnet_peer_find_by_node_id(dev, source_node_id, generation);
723 if (!peer) {
724 retval = -ENOENT;
725 goto fail;
726 }
727
728 pd = fwnet_pd_find(peer, datagram_label);
729 if (pd == NULL) {
730 while (peer->pdg_size >= FWNET_MAX_FRAGMENTS) {
731 /* remove the oldest */
732 fwnet_pd_delete(list_first_entry(&peer->pd_list,
733 struct fwnet_partial_datagram, pd_link));
734 peer->pdg_size--;
735 }
736 pd = fwnet_pd_new(net, peer, datagram_label,
737 dg_size, buf, fg_off, len);
738 if (pd == NULL) {
739 retval = -ENOMEM;
740 goto fail;
741 }
742 peer->pdg_size++;
743 } else {
744 if (fwnet_frag_overlap(pd, fg_off, len) ||
745 pd->datagram_size != dg_size) {
746 /*
747 * Differing datagram sizes or overlapping fragments,
748 * discard old datagram and start a new one.
749 */
750 fwnet_pd_delete(pd);
751 pd = fwnet_pd_new(net, peer, datagram_label,
752 dg_size, buf, fg_off, len);
753 if (pd == NULL) {
754 peer->pdg_size--;
755 retval = -ENOMEM;
756 goto fail;
757 }
758 } else {
759 if (!fwnet_pd_update(peer, pd, buf, fg_off, len)) {
760 /*
761 * Couldn't save off fragment anyway
762 * so might as well obliterate the
763 * datagram now.
764 */
765 fwnet_pd_delete(pd);
766 peer->pdg_size--;
767 retval = -ENOMEM;
768 goto fail;
769 }
770 }
771 } /* new datagram or add to existing one */
772
773 if (lf == RFC2374_HDR_FIRSTFRAG)
774 pd->ether_type = ether_type;
775
776 if (fwnet_pd_is_complete(pd)) {
777 ether_type = pd->ether_type;
778 peer->pdg_size--;
779 skb = skb_get(pd->skb);
780 fwnet_pd_delete(pd);
781
782 spin_unlock_irqrestore(&dev->lock, flags);
783
784 return fwnet_finish_incoming_packet(net, skb, source_node_id,
785 false, ether_type);
786 }
787 /*
788 * Datagram is not complete, we're done for the
789 * moment.
790 */
791 spin_unlock_irqrestore(&dev->lock, flags);
792
793 return 0;
794 fail:
795 spin_unlock_irqrestore(&dev->lock, flags);
796
797 if (netif_queue_stopped(net))
798 netif_wake_queue(net);
799
800 return retval;
801 }
802
803 static void fwnet_receive_packet(struct fw_card *card, struct fw_request *r,
804 int tcode, int destination, int source, int generation,
805 unsigned long long offset, void *payload, size_t length,
806 void *callback_data)
807 {
808 struct fwnet_device *dev = callback_data;
809 int rcode;
810
811 if (destination == IEEE1394_ALL_NODES) {
812 kfree(r);
813
814 return;
815 }
816
817 if (offset != dev->handler.offset)
818 rcode = RCODE_ADDRESS_ERROR;
819 else if (tcode != TCODE_WRITE_BLOCK_REQUEST)
820 rcode = RCODE_TYPE_ERROR;
821 else if (fwnet_incoming_packet(dev, payload, length,
822 source, generation, false) != 0) {
823 fw_error("Incoming packet failure\n");
824 rcode = RCODE_CONFLICT_ERROR;
825 } else
826 rcode = RCODE_COMPLETE;
827
828 fw_send_response(card, r, rcode);
829 }
830
831 static void fwnet_receive_broadcast(struct fw_iso_context *context,
832 u32 cycle, size_t header_length, void *header, void *data)
833 {
834 struct fwnet_device *dev;
835 struct fw_iso_packet packet;
836 struct fw_card *card;
837 __be16 *hdr_ptr;
838 __be32 *buf_ptr;
839 int retval;
840 u32 length;
841 u16 source_node_id;
842 u32 specifier_id;
843 u32 ver;
844 unsigned long offset;
845 unsigned long flags;
846
847 dev = data;
848 card = dev->card;
849 hdr_ptr = header;
850 length = be16_to_cpup(hdr_ptr);
851
852 spin_lock_irqsave(&dev->lock, flags);
853
854 offset = dev->rcv_buffer_size * dev->broadcast_rcv_next_ptr;
855 buf_ptr = dev->broadcast_rcv_buffer_ptrs[dev->broadcast_rcv_next_ptr++];
856 if (dev->broadcast_rcv_next_ptr == dev->num_broadcast_rcv_ptrs)
857 dev->broadcast_rcv_next_ptr = 0;
858
859 spin_unlock_irqrestore(&dev->lock, flags);
860
861 specifier_id = (be32_to_cpu(buf_ptr[0]) & 0xffff) << 8
862 | (be32_to_cpu(buf_ptr[1]) & 0xff000000) >> 24;
863 ver = be32_to_cpu(buf_ptr[1]) & 0xffffff;
864 source_node_id = be32_to_cpu(buf_ptr[0]) >> 16;
865
866 if (specifier_id == IANA_SPECIFIER_ID && ver == RFC2734_SW_VERSION) {
867 buf_ptr += 2;
868 length -= IEEE1394_GASP_HDR_SIZE;
869 fwnet_incoming_packet(dev, buf_ptr, length,
870 source_node_id, -1, true);
871 }
872
873 packet.payload_length = dev->rcv_buffer_size;
874 packet.interrupt = 1;
875 packet.skip = 0;
876 packet.tag = 3;
877 packet.sy = 0;
878 packet.header_length = IEEE1394_GASP_HDR_SIZE;
879
880 spin_lock_irqsave(&dev->lock, flags);
881
882 retval = fw_iso_context_queue(dev->broadcast_rcv_context, &packet,
883 &dev->broadcast_rcv_buffer, offset);
884
885 spin_unlock_irqrestore(&dev->lock, flags);
886
887 if (retval < 0)
888 fw_error("requeue failed\n");
889 }
890
891 static struct kmem_cache *fwnet_packet_task_cache;
892
893 static 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 static int fwnet_send_packet(struct fwnet_packet_task *ptask);
900
901 static void fwnet_transmit_packet_done(struct fwnet_packet_task *ptask)
902 {
903 struct fwnet_device *dev = ptask->dev;
904 unsigned long flags;
905 bool free;
906
907 spin_lock_irqsave(&dev->lock, flags);
908
909 ptask->outstanding_pkts--;
910
911 /* Check whether we or the networking TX soft-IRQ is last user. */
912 free = (ptask->outstanding_pkts == 0 && !list_empty(&ptask->pt_link));
913
914 if (ptask->outstanding_pkts == 0)
915 list_del(&ptask->pt_link);
916
917 spin_unlock_irqrestore(&dev->lock, flags);
918
919 if (ptask->outstanding_pkts > 0) {
920 u16 dg_size;
921 u16 fg_off;
922 u16 datagram_label;
923 u16 lf;
924 struct sk_buff *skb;
925
926 /* Update the ptask to point to the next fragment and send it */
927 lf = fwnet_get_hdr_lf(&ptask->hdr);
928 switch (lf) {
929 case RFC2374_HDR_LASTFRAG:
930 case RFC2374_HDR_UNFRAG:
931 default:
932 fw_error("Outstanding packet %x lf %x, header %x,%x\n",
933 ptask->outstanding_pkts, lf, ptask->hdr.w0,
934 ptask->hdr.w1);
935 BUG();
936
937 case RFC2374_HDR_FIRSTFRAG:
938 /* Set frag type here for future interior fragments */
939 dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
940 fg_off = ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
941 datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
942 break;
943
944 case RFC2374_HDR_INTFRAG:
945 dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
946 fg_off = fwnet_get_hdr_fg_off(&ptask->hdr)
947 + ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
948 datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
949 break;
950 }
951 skb = ptask->skb;
952 skb_pull(skb, ptask->max_payload);
953 if (ptask->outstanding_pkts > 1) {
954 fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_INTFRAG,
955 dg_size, fg_off, datagram_label);
956 } else {
957 fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_LASTFRAG,
958 dg_size, fg_off, datagram_label);
959 ptask->max_payload = skb->len + RFC2374_FRAG_HDR_SIZE;
960 }
961 fwnet_send_packet(ptask);
962 }
963
964 if (free)
965 fwnet_free_ptask(ptask);
966 }
967
968 static void fwnet_write_complete(struct fw_card *card, int rcode,
969 void *payload, size_t length, void *data)
970 {
971 struct fwnet_packet_task *ptask;
972
973 ptask = data;
974
975 if (rcode == RCODE_COMPLETE)
976 fwnet_transmit_packet_done(ptask);
977 else
978 fw_error("fwnet_write_complete: failed: %x\n", rcode);
979 /* ??? error recovery */
980 }
981
982 static int fwnet_send_packet(struct fwnet_packet_task *ptask)
983 {
984 struct fwnet_device *dev;
985 unsigned tx_len;
986 struct rfc2734_header *bufhdr;
987 unsigned long flags;
988 bool free;
989
990 dev = ptask->dev;
991 tx_len = ptask->max_payload;
992 switch (fwnet_get_hdr_lf(&ptask->hdr)) {
993 case RFC2374_HDR_UNFRAG:
994 bufhdr = (struct rfc2734_header *)
995 skb_push(ptask->skb, RFC2374_UNFRAG_HDR_SIZE);
996 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
997 break;
998
999 case RFC2374_HDR_FIRSTFRAG:
1000 case RFC2374_HDR_INTFRAG:
1001 case RFC2374_HDR_LASTFRAG:
1002 bufhdr = (struct rfc2734_header *)
1003 skb_push(ptask->skb, RFC2374_FRAG_HDR_SIZE);
1004 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
1005 put_unaligned_be32(ptask->hdr.w1, &bufhdr->w1);
1006 break;
1007
1008 default:
1009 BUG();
1010 }
1011 if (ptask->dest_node == IEEE1394_ALL_NODES) {
1012 u8 *p;
1013 int generation;
1014 int node_id;
1015
1016 /* ptask->generation may not have been set yet */
1017 generation = dev->card->generation;
1018 smp_rmb();
1019 node_id = dev->card->node_id;
1020
1021 p = skb_push(ptask->skb, 8);
1022 put_unaligned_be32(node_id << 16 | IANA_SPECIFIER_ID >> 8, p);
1023 put_unaligned_be32((IANA_SPECIFIER_ID & 0xff) << 24
1024 | RFC2734_SW_VERSION, &p[4]);
1025
1026 /* We should not transmit if broadcast_channel.valid == 0. */
1027 fw_send_request(dev->card, &ptask->transaction,
1028 TCODE_STREAM_DATA,
1029 fw_stream_packet_destination_id(3,
1030 IEEE1394_BROADCAST_CHANNEL, 0),
1031 generation, SCODE_100, 0ULL, ptask->skb->data,
1032 tx_len + 8, fwnet_write_complete, ptask);
1033
1034 spin_lock_irqsave(&dev->lock, flags);
1035
1036 /* If the AT tasklet already ran, we may be last user. */
1037 free = (ptask->outstanding_pkts == 0 && list_empty(&ptask->pt_link));
1038 if (!free)
1039 list_add_tail(&ptask->pt_link, &dev->broadcasted_list);
1040
1041 spin_unlock_irqrestore(&dev->lock, flags);
1042
1043 goto out;
1044 }
1045
1046 fw_send_request(dev->card, &ptask->transaction,
1047 TCODE_WRITE_BLOCK_REQUEST, ptask->dest_node,
1048 ptask->generation, ptask->speed, ptask->fifo_addr,
1049 ptask->skb->data, tx_len, fwnet_write_complete, ptask);
1050
1051 spin_lock_irqsave(&dev->lock, flags);
1052
1053 /* If the AT tasklet already ran, we may be last user. */
1054 free = (ptask->outstanding_pkts == 0 && list_empty(&ptask->pt_link));
1055 if (!free)
1056 list_add_tail(&ptask->pt_link, &dev->sent_list);
1057
1058 spin_unlock_irqrestore(&dev->lock, flags);
1059
1060 dev->netdev->trans_start = jiffies;
1061 out:
1062 if (free)
1063 fwnet_free_ptask(ptask);
1064
1065 return 0;
1066 }
1067
1068 static int fwnet_broadcast_start(struct fwnet_device *dev)
1069 {
1070 struct fw_iso_context *context;
1071 int retval;
1072 unsigned num_packets;
1073 unsigned max_receive;
1074 struct fw_iso_packet packet;
1075 unsigned long offset;
1076 unsigned u;
1077
1078 if (dev->local_fifo == FWNET_NO_FIFO_ADDR) {
1079 /* outside OHCI posted write area? */
1080 static const struct fw_address_region region = {
1081 .start = 0xffff00000000ULL,
1082 .end = CSR_REGISTER_BASE,
1083 };
1084
1085 dev->handler.length = 4096;
1086 dev->handler.address_callback = fwnet_receive_packet;
1087 dev->handler.callback_data = dev;
1088
1089 retval = fw_core_add_address_handler(&dev->handler, &region);
1090 if (retval < 0)
1091 goto failed_initial;
1092
1093 dev->local_fifo = dev->handler.offset;
1094 }
1095
1096 max_receive = 1U << (dev->card->max_receive + 1);
1097 num_packets = (FWNET_ISO_PAGE_COUNT * PAGE_SIZE) / max_receive;
1098
1099 if (!dev->broadcast_rcv_context) {
1100 void **ptrptr;
1101
1102 context = fw_iso_context_create(dev->card,
1103 FW_ISO_CONTEXT_RECEIVE, IEEE1394_BROADCAST_CHANNEL,
1104 dev->card->link_speed, 8, fwnet_receive_broadcast, dev);
1105 if (IS_ERR(context)) {
1106 retval = PTR_ERR(context);
1107 goto failed_context_create;
1108 }
1109
1110 retval = fw_iso_buffer_init(&dev->broadcast_rcv_buffer,
1111 dev->card, FWNET_ISO_PAGE_COUNT, DMA_FROM_DEVICE);
1112 if (retval < 0)
1113 goto failed_buffer_init;
1114
1115 ptrptr = kmalloc(sizeof(void *) * num_packets, GFP_KERNEL);
1116 if (!ptrptr) {
1117 retval = -ENOMEM;
1118 goto failed_ptrs_alloc;
1119 }
1120
1121 dev->broadcast_rcv_buffer_ptrs = ptrptr;
1122 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++) {
1123 void *ptr;
1124 unsigned v;
1125
1126 ptr = kmap(dev->broadcast_rcv_buffer.pages[u]);
1127 for (v = 0; v < num_packets / FWNET_ISO_PAGE_COUNT; v++)
1128 *ptrptr++ = (void *)
1129 ((char *)ptr + v * max_receive);
1130 }
1131 dev->broadcast_rcv_context = context;
1132 } else {
1133 context = dev->broadcast_rcv_context;
1134 }
1135
1136 packet.payload_length = max_receive;
1137 packet.interrupt = 1;
1138 packet.skip = 0;
1139 packet.tag = 3;
1140 packet.sy = 0;
1141 packet.header_length = IEEE1394_GASP_HDR_SIZE;
1142 offset = 0;
1143
1144 for (u = 0; u < num_packets; u++) {
1145 retval = fw_iso_context_queue(context, &packet,
1146 &dev->broadcast_rcv_buffer, offset);
1147 if (retval < 0)
1148 goto failed_rcv_queue;
1149
1150 offset += max_receive;
1151 }
1152 dev->num_broadcast_rcv_ptrs = num_packets;
1153 dev->rcv_buffer_size = max_receive;
1154 dev->broadcast_rcv_next_ptr = 0U;
1155 retval = fw_iso_context_start(context, -1, 0,
1156 FW_ISO_CONTEXT_MATCH_ALL_TAGS); /* ??? sync */
1157 if (retval < 0)
1158 goto failed_rcv_queue;
1159
1160 dev->broadcast_xmt_max_payload = IEEE1394_MAX_PAYLOAD_S100
1161 - IEEE1394_GASP_HDR_SIZE - RFC2374_UNFRAG_HDR_SIZE;
1162 dev->broadcast_state = FWNET_BROADCAST_RUNNING;
1163
1164 return 0;
1165
1166 failed_rcv_queue:
1167 kfree(dev->broadcast_rcv_buffer_ptrs);
1168 dev->broadcast_rcv_buffer_ptrs = NULL;
1169 failed_ptrs_alloc:
1170 fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer, dev->card);
1171 failed_buffer_init:
1172 fw_iso_context_destroy(context);
1173 dev->broadcast_rcv_context = NULL;
1174 failed_context_create:
1175 fw_core_remove_address_handler(&dev->handler);
1176 failed_initial:
1177 dev->local_fifo = FWNET_NO_FIFO_ADDR;
1178
1179 return retval;
1180 }
1181
1182 /* ifup */
1183 static int fwnet_open(struct net_device *net)
1184 {
1185 struct fwnet_device *dev = netdev_priv(net);
1186 int ret;
1187
1188 if (dev->broadcast_state == FWNET_BROADCAST_ERROR) {
1189 ret = fwnet_broadcast_start(dev);
1190 if (ret)
1191 return ret;
1192 }
1193 netif_start_queue(net);
1194
1195 return 0;
1196 }
1197
1198 /* ifdown */
1199 static int fwnet_stop(struct net_device *net)
1200 {
1201 netif_stop_queue(net);
1202
1203 /* Deallocate iso context for use by other applications? */
1204
1205 return 0;
1206 }
1207
1208 static netdev_tx_t fwnet_tx(struct sk_buff *skb, struct net_device *net)
1209 {
1210 struct fwnet_header hdr_buf;
1211 struct fwnet_device *dev = netdev_priv(net);
1212 __be16 proto;
1213 u16 dest_node;
1214 unsigned max_payload;
1215 u16 dg_size;
1216 u16 *datagram_label_ptr;
1217 struct fwnet_packet_task *ptask;
1218 struct fwnet_peer *peer;
1219 unsigned long flags;
1220
1221 ptask = kmem_cache_alloc(fwnet_packet_task_cache, GFP_ATOMIC);
1222 if (ptask == NULL)
1223 goto fail;
1224
1225 skb = skb_share_check(skb, GFP_ATOMIC);
1226 if (!skb)
1227 goto fail;
1228
1229 /*
1230 * Make a copy of the driver-specific header.
1231 * We might need to rebuild the header on tx failure.
1232 */
1233 memcpy(&hdr_buf, skb->data, sizeof(hdr_buf));
1234 skb_pull(skb, sizeof(hdr_buf));
1235
1236 proto = hdr_buf.h_proto;
1237 dg_size = skb->len;
1238
1239 /* serialize access to peer, including peer->datagram_label */
1240 spin_lock_irqsave(&dev->lock, flags);
1241
1242 /*
1243 * Set the transmission type for the packet. ARP packets and IP
1244 * broadcast packets are sent via GASP.
1245 */
1246 if (memcmp(hdr_buf.h_dest, net->broadcast, FWNET_ALEN) == 0
1247 || proto == htons(ETH_P_ARP)
1248 || (proto == htons(ETH_P_IP)
1249 && IN_MULTICAST(ntohl(ip_hdr(skb)->daddr)))) {
1250 max_payload = dev->broadcast_xmt_max_payload;
1251 datagram_label_ptr = &dev->broadcast_xmt_datagramlabel;
1252
1253 ptask->fifo_addr = FWNET_NO_FIFO_ADDR;
1254 ptask->generation = 0;
1255 ptask->dest_node = IEEE1394_ALL_NODES;
1256 ptask->speed = SCODE_100;
1257 } else {
1258 __be64 guid = get_unaligned((__be64 *)hdr_buf.h_dest);
1259 u8 generation;
1260
1261 peer = fwnet_peer_find_by_guid(dev, be64_to_cpu(guid));
1262 if (!peer || peer->fifo == FWNET_NO_FIFO_ADDR)
1263 goto fail_unlock;
1264
1265 generation = peer->generation;
1266 dest_node = peer->node_id;
1267 max_payload = peer->max_payload;
1268 datagram_label_ptr = &peer->datagram_label;
1269
1270 ptask->fifo_addr = peer->fifo;
1271 ptask->generation = generation;
1272 ptask->dest_node = dest_node;
1273 ptask->speed = peer->speed;
1274 }
1275
1276 /* If this is an ARP packet, convert it */
1277 if (proto == htons(ETH_P_ARP)) {
1278 struct arphdr *arp = (struct arphdr *)skb->data;
1279 unsigned char *arp_ptr = (unsigned char *)(arp + 1);
1280 struct rfc2734_arp *arp1394 = (struct rfc2734_arp *)skb->data;
1281 __be32 ipaddr;
1282
1283 ipaddr = get_unaligned((__be32 *)(arp_ptr + FWNET_ALEN));
1284
1285 arp1394->hw_addr_len = RFC2734_HW_ADDR_LEN;
1286 arp1394->max_rec = dev->card->max_receive;
1287 arp1394->sspd = dev->card->link_speed;
1288
1289 put_unaligned_be16(dev->local_fifo >> 32,
1290 &arp1394->fifo_hi);
1291 put_unaligned_be32(dev->local_fifo & 0xffffffff,
1292 &arp1394->fifo_lo);
1293 put_unaligned(ipaddr, &arp1394->sip);
1294 }
1295
1296 ptask->hdr.w0 = 0;
1297 ptask->hdr.w1 = 0;
1298 ptask->skb = skb;
1299 ptask->dev = dev;
1300
1301 /* Does it all fit in one packet? */
1302 if (dg_size <= max_payload) {
1303 fwnet_make_uf_hdr(&ptask->hdr, ntohs(proto));
1304 ptask->outstanding_pkts = 1;
1305 max_payload = dg_size + RFC2374_UNFRAG_HDR_SIZE;
1306 } else {
1307 u16 datagram_label;
1308
1309 max_payload -= RFC2374_FRAG_OVERHEAD;
1310 datagram_label = (*datagram_label_ptr)++;
1311 fwnet_make_ff_hdr(&ptask->hdr, ntohs(proto), dg_size,
1312 datagram_label);
1313 ptask->outstanding_pkts = DIV_ROUND_UP(dg_size, max_payload);
1314 max_payload += RFC2374_FRAG_HDR_SIZE;
1315 }
1316
1317 spin_unlock_irqrestore(&dev->lock, flags);
1318
1319 ptask->max_payload = max_payload;
1320 INIT_LIST_HEAD(&ptask->pt_link);
1321
1322 fwnet_send_packet(ptask);
1323
1324 return NETDEV_TX_OK;
1325
1326 fail_unlock:
1327 spin_unlock_irqrestore(&dev->lock, flags);
1328 fail:
1329 if (ptask)
1330 kmem_cache_free(fwnet_packet_task_cache, ptask);
1331
1332 if (skb != NULL)
1333 dev_kfree_skb(skb);
1334
1335 net->stats.tx_dropped++;
1336 net->stats.tx_errors++;
1337
1338 return NETDEV_TX_OK;
1339 }
1340
1341 static int fwnet_change_mtu(struct net_device *net, int new_mtu)
1342 {
1343 if (new_mtu < 68)
1344 return -EINVAL;
1345
1346 net->mtu = new_mtu;
1347 return 0;
1348 }
1349
1350 static void fwnet_get_drvinfo(struct net_device *net,
1351 struct ethtool_drvinfo *info)
1352 {
1353 strcpy(info->driver, KBUILD_MODNAME);
1354 strcpy(info->bus_info, "ieee1394");
1355 }
1356
1357 static const struct ethtool_ops fwnet_ethtool_ops = {
1358 .get_drvinfo = fwnet_get_drvinfo,
1359 };
1360
1361 static const struct net_device_ops fwnet_netdev_ops = {
1362 .ndo_open = fwnet_open,
1363 .ndo_stop = fwnet_stop,
1364 .ndo_start_xmit = fwnet_tx,
1365 .ndo_change_mtu = fwnet_change_mtu,
1366 };
1367
1368 static void fwnet_init_dev(struct net_device *net)
1369 {
1370 net->header_ops = &fwnet_header_ops;
1371 net->netdev_ops = &fwnet_netdev_ops;
1372 net->watchdog_timeo = 2 * HZ;
1373 net->flags = IFF_BROADCAST | IFF_MULTICAST;
1374 net->features = NETIF_F_HIGHDMA;
1375 net->addr_len = FWNET_ALEN;
1376 net->hard_header_len = FWNET_HLEN;
1377 net->type = ARPHRD_IEEE1394;
1378 net->tx_queue_len = 10;
1379 SET_ETHTOOL_OPS(net, &fwnet_ethtool_ops);
1380 }
1381
1382 /* caller must hold fwnet_device_mutex */
1383 static struct fwnet_device *fwnet_dev_find(struct fw_card *card)
1384 {
1385 struct fwnet_device *dev;
1386
1387 list_for_each_entry(dev, &fwnet_device_list, dev_link)
1388 if (dev->card == card)
1389 return dev;
1390
1391 return NULL;
1392 }
1393
1394 static int fwnet_add_peer(struct fwnet_device *dev,
1395 struct fw_unit *unit, struct fw_device *device)
1396 {
1397 struct fwnet_peer *peer;
1398
1399 peer = kmalloc(sizeof(*peer), GFP_KERNEL);
1400 if (!peer)
1401 return -ENOMEM;
1402
1403 dev_set_drvdata(&unit->device, peer);
1404
1405 peer->dev = dev;
1406 peer->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4];
1407 peer->fifo = FWNET_NO_FIFO_ADDR;
1408 INIT_LIST_HEAD(&peer->pd_list);
1409 peer->pdg_size = 0;
1410 peer->datagram_label = 0;
1411 peer->speed = device->max_speed;
1412 peer->max_payload = fwnet_max_payload(device->max_rec, peer->speed);
1413
1414 peer->generation = device->generation;
1415 smp_rmb();
1416 peer->node_id = device->node_id;
1417
1418 spin_lock_irq(&dev->lock);
1419 list_add_tail(&peer->peer_link, &dev->peer_list);
1420 spin_unlock_irq(&dev->lock);
1421
1422 return 0;
1423 }
1424
1425 static int fwnet_probe(struct device *_dev)
1426 {
1427 struct fw_unit *unit = fw_unit(_dev);
1428 struct fw_device *device = fw_parent_device(unit);
1429 struct fw_card *card = device->card;
1430 struct net_device *net;
1431 bool allocated_netdev = false;
1432 struct fwnet_device *dev;
1433 unsigned max_mtu;
1434 int ret;
1435
1436 mutex_lock(&fwnet_device_mutex);
1437
1438 dev = fwnet_dev_find(card);
1439 if (dev) {
1440 net = dev->netdev;
1441 goto have_dev;
1442 }
1443
1444 net = alloc_netdev(sizeof(*dev), "firewire%d", fwnet_init_dev);
1445 if (net == NULL) {
1446 ret = -ENOMEM;
1447 goto out;
1448 }
1449
1450 allocated_netdev = true;
1451 SET_NETDEV_DEV(net, card->device);
1452 dev = netdev_priv(net);
1453
1454 spin_lock_init(&dev->lock);
1455 dev->broadcast_state = FWNET_BROADCAST_ERROR;
1456 dev->broadcast_rcv_context = NULL;
1457 dev->broadcast_xmt_max_payload = 0;
1458 dev->broadcast_xmt_datagramlabel = 0;
1459
1460 dev->local_fifo = FWNET_NO_FIFO_ADDR;
1461
1462 INIT_LIST_HEAD(&dev->packet_list);
1463 INIT_LIST_HEAD(&dev->broadcasted_list);
1464 INIT_LIST_HEAD(&dev->sent_list);
1465 INIT_LIST_HEAD(&dev->peer_list);
1466
1467 dev->card = card;
1468 dev->netdev = net;
1469
1470 /*
1471 * Use the RFC 2734 default 1500 octets or the maximum payload
1472 * as initial MTU
1473 */
1474 max_mtu = (1 << (card->max_receive + 1))
1475 - sizeof(struct rfc2734_header) - IEEE1394_GASP_HDR_SIZE;
1476 net->mtu = min(1500U, max_mtu);
1477
1478 /* Set our hardware address while we're at it */
1479 put_unaligned_be64(card->guid, net->dev_addr);
1480 put_unaligned_be64(~0ULL, net->broadcast);
1481 ret = register_netdev(net);
1482 if (ret) {
1483 fw_error("Cannot register the driver\n");
1484 goto out;
1485 }
1486
1487 list_add_tail(&dev->dev_link, &fwnet_device_list);
1488 fw_notify("%s: IPv4 over FireWire on device %016llx\n",
1489 net->name, (unsigned long long)card->guid);
1490 have_dev:
1491 ret = fwnet_add_peer(dev, unit, device);
1492 if (ret && allocated_netdev) {
1493 unregister_netdev(net);
1494 list_del(&dev->dev_link);
1495 }
1496 out:
1497 if (ret && allocated_netdev)
1498 free_netdev(net);
1499
1500 mutex_unlock(&fwnet_device_mutex);
1501
1502 return ret;
1503 }
1504
1505 static void fwnet_remove_peer(struct fwnet_peer *peer)
1506 {
1507 struct fwnet_partial_datagram *pd, *pd_next;
1508
1509 spin_lock_irq(&peer->dev->lock);
1510 list_del(&peer->peer_link);
1511 spin_unlock_irq(&peer->dev->lock);
1512
1513 list_for_each_entry_safe(pd, pd_next, &peer->pd_list, pd_link)
1514 fwnet_pd_delete(pd);
1515
1516 kfree(peer);
1517 }
1518
1519 static int fwnet_remove(struct device *_dev)
1520 {
1521 struct fwnet_peer *peer = dev_get_drvdata(_dev);
1522 struct fwnet_device *dev = peer->dev;
1523 struct net_device *net;
1524 struct fwnet_packet_task *ptask, *pt_next;
1525
1526 mutex_lock(&fwnet_device_mutex);
1527
1528 fwnet_remove_peer(peer);
1529
1530 if (list_empty(&dev->peer_list)) {
1531 net = dev->netdev;
1532 unregister_netdev(net);
1533
1534 if (dev->local_fifo != FWNET_NO_FIFO_ADDR)
1535 fw_core_remove_address_handler(&dev->handler);
1536 if (dev->broadcast_rcv_context) {
1537 fw_iso_context_stop(dev->broadcast_rcv_context);
1538 fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer,
1539 dev->card);
1540 fw_iso_context_destroy(dev->broadcast_rcv_context);
1541 }
1542 list_for_each_entry_safe(ptask, pt_next,
1543 &dev->packet_list, pt_link) {
1544 dev_kfree_skb_any(ptask->skb);
1545 kmem_cache_free(fwnet_packet_task_cache, ptask);
1546 }
1547 list_for_each_entry_safe(ptask, pt_next,
1548 &dev->broadcasted_list, pt_link) {
1549 dev_kfree_skb_any(ptask->skb);
1550 kmem_cache_free(fwnet_packet_task_cache, ptask);
1551 }
1552 list_for_each_entry_safe(ptask, pt_next,
1553 &dev->sent_list, pt_link) {
1554 dev_kfree_skb_any(ptask->skb);
1555 kmem_cache_free(fwnet_packet_task_cache, ptask);
1556 }
1557 list_del(&dev->dev_link);
1558
1559 free_netdev(net);
1560 }
1561
1562 mutex_unlock(&fwnet_device_mutex);
1563
1564 return 0;
1565 }
1566
1567 static void fwnet_update(struct fw_unit *unit)
1568 {
1569 struct fw_device *device = fw_parent_device(unit);
1570 struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1571 int generation;
1572
1573 generation = device->generation;
1574
1575 spin_lock_irq(&peer->dev->lock);
1576 peer->node_id = device->node_id;
1577 peer->generation = generation;
1578 spin_unlock_irq(&peer->dev->lock);
1579 }
1580
1581 static const struct ieee1394_device_id fwnet_id_table[] = {
1582 {
1583 .match_flags = IEEE1394_MATCH_SPECIFIER_ID |
1584 IEEE1394_MATCH_VERSION,
1585 .specifier_id = IANA_SPECIFIER_ID,
1586 .version = RFC2734_SW_VERSION,
1587 },
1588 { }
1589 };
1590
1591 static struct fw_driver fwnet_driver = {
1592 .driver = {
1593 .owner = THIS_MODULE,
1594 .name = "net",
1595 .bus = &fw_bus_type,
1596 .probe = fwnet_probe,
1597 .remove = fwnet_remove,
1598 },
1599 .update = fwnet_update,
1600 .id_table = fwnet_id_table,
1601 };
1602
1603 static const u32 rfc2374_unit_directory_data[] = {
1604 0x00040000, /* directory_length */
1605 0x1200005e, /* unit_specifier_id: IANA */
1606 0x81000003, /* textual descriptor offset */
1607 0x13000001, /* unit_sw_version: RFC 2734 */
1608 0x81000005, /* textual descriptor offset */
1609 0x00030000, /* descriptor_length */
1610 0x00000000, /* text */
1611 0x00000000, /* minimal ASCII, en */
1612 0x49414e41, /* I A N A */
1613 0x00030000, /* descriptor_length */
1614 0x00000000, /* text */
1615 0x00000000, /* minimal ASCII, en */
1616 0x49507634, /* I P v 4 */
1617 };
1618
1619 static struct fw_descriptor rfc2374_unit_directory = {
1620 .length = ARRAY_SIZE(rfc2374_unit_directory_data),
1621 .key = (CSR_DIRECTORY | CSR_UNIT) << 24,
1622 .data = rfc2374_unit_directory_data
1623 };
1624
1625 static int __init fwnet_init(void)
1626 {
1627 int err;
1628
1629 err = fw_core_add_descriptor(&rfc2374_unit_directory);
1630 if (err)
1631 return err;
1632
1633 fwnet_packet_task_cache = kmem_cache_create("packet_task",
1634 sizeof(struct fwnet_packet_task), 0, 0, NULL);
1635 if (!fwnet_packet_task_cache) {
1636 err = -ENOMEM;
1637 goto out;
1638 }
1639
1640 err = driver_register(&fwnet_driver.driver);
1641 if (!err)
1642 return 0;
1643
1644 kmem_cache_destroy(fwnet_packet_task_cache);
1645 out:
1646 fw_core_remove_descriptor(&rfc2374_unit_directory);
1647
1648 return err;
1649 }
1650 module_init(fwnet_init);
1651
1652 static void __exit fwnet_cleanup(void)
1653 {
1654 driver_unregister(&fwnet_driver.driver);
1655 kmem_cache_destroy(fwnet_packet_task_cache);
1656 fw_core_remove_descriptor(&rfc2374_unit_directory);
1657 }
1658 module_exit(fwnet_cleanup);
1659
1660 MODULE_AUTHOR("Jay Fenlason <fenlason@redhat.com>");
1661 MODULE_DESCRIPTION("IPv4 over IEEE1394 as per RFC 2734");
1662 MODULE_LICENSE("GPL");
1663 MODULE_DEVICE_TABLE(ieee1394, fwnet_id_table);
Tomato firmware and modifications.