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Add linux-next specific files for 20110831
[linux-2.6/next.git] / drivers / firewire / net.c
blob03a7a85d0424895e9e73301b36637e9848f70d69
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 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, __be16 type)
266 {
267 struct net_device *net;
268 struct fwnet_header *h;
269
270 if (type == cpu_to_be16(ETH_P_802_3))
271 return -1;
272 net = neigh->dev;
273 h = (struct fwnet_header *)((u8 *)hh->hh_data + 16 - sizeof(*h));
274 h->h_proto = type;
275 memcpy(h->h_dest, neigh->ha, net->addr_len);
276 hh->hh_len = FWNET_HLEN;
277
278 return 0;
279 }
280
281 /* Called by Address Resolution module to notify changes in address. */
282 static void fwnet_header_cache_update(struct hh_cache *hh,
283 const struct net_device *net, const unsigned char *haddr)
284 {
285 memcpy((u8 *)hh->hh_data + 16 - FWNET_HLEN, haddr, net->addr_len);
286 }
287
288 static int fwnet_header_parse(const struct sk_buff *skb, unsigned char *haddr)
289 {
290 memcpy(haddr, skb->dev->dev_addr, FWNET_ALEN);
291
292 return FWNET_ALEN;
293 }
294
295 static const struct header_ops fwnet_header_ops = {
296 .create = fwnet_header_create,
297 .rebuild = fwnet_header_rebuild,
298 .cache = fwnet_header_cache,
299 .cache_update = fwnet_header_cache_update,
300 .parse = fwnet_header_parse,
301 };
302
303 /* FIXME: is this correct for all cases? */
304 static bool fwnet_frag_overlap(struct fwnet_partial_datagram *pd,
305 unsigned offset, unsigned len)
306 {
307 struct fwnet_fragment_info *fi;
308 unsigned end = offset + len;
309
310 list_for_each_entry(fi, &pd->fi_list, fi_link)
311 if (offset < fi->offset + fi->len && end > fi->offset)
312 return true;
313
314 return false;
315 }
316
317 /* Assumes that new fragment does not overlap any existing fragments */
318 static struct fwnet_fragment_info *fwnet_frag_new(
319 struct fwnet_partial_datagram *pd, unsigned offset, unsigned len)
320 {
321 struct fwnet_fragment_info *fi, *fi2, *new;
322 struct list_head *list;
323
324 list = &pd->fi_list;
325 list_for_each_entry(fi, &pd->fi_list, fi_link) {
326 if (fi->offset + fi->len == offset) {
327 /* The new fragment can be tacked on to the end */
328 /* Did the new fragment plug a hole? */
329 fi2 = list_entry(fi->fi_link.next,
330 struct fwnet_fragment_info, fi_link);
331 if (fi->offset + fi->len == fi2->offset) {
332 /* glue fragments together */
333 fi->len += len + fi2->len;
334 list_del(&fi2->fi_link);
335 kfree(fi2);
336 } else {
337 fi->len += len;
338 }
339
340 return fi;
341 }
342 if (offset + len == fi->offset) {
343 /* The new fragment can be tacked on to the beginning */
344 /* Did the new fragment plug a hole? */
345 fi2 = list_entry(fi->fi_link.prev,
346 struct fwnet_fragment_info, fi_link);
347 if (fi2->offset + fi2->len == fi->offset) {
348 /* glue fragments together */
349 fi2->len += fi->len + len;
350 list_del(&fi->fi_link);
351 kfree(fi);
352
353 return fi2;
354 }
355 fi->offset = offset;
356 fi->len += len;
357
358 return fi;
359 }
360 if (offset > fi->offset + fi->len) {
361 list = &fi->fi_link;
362 break;
363 }
364 if (offset + len < fi->offset) {
365 list = fi->fi_link.prev;
366 break;
367 }
368 }
369
370 new = kmalloc(sizeof(*new), GFP_ATOMIC);
371 if (!new) {
372 fw_error("out of memory\n");
373 return NULL;
374 }
375
376 new->offset = offset;
377 new->len = len;
378 list_add(&new->fi_link, list);
379
380 return new;
381 }
382
383 static struct fwnet_partial_datagram *fwnet_pd_new(struct net_device *net,
384 struct fwnet_peer *peer, u16 datagram_label, unsigned dg_size,
385 void *frag_buf, unsigned frag_off, unsigned frag_len)
386 {
387 struct fwnet_partial_datagram *new;
388 struct fwnet_fragment_info *fi;
389
390 new = kmalloc(sizeof(*new), GFP_ATOMIC);
391 if (!new)
392 goto fail;
393
394 INIT_LIST_HEAD(&new->fi_list);
395 fi = fwnet_frag_new(new, frag_off, frag_len);
396 if (fi == NULL)
397 goto fail_w_new;
398
399 new->datagram_label = datagram_label;
400 new->datagram_size = dg_size;
401 new->skb = dev_alloc_skb(dg_size + net->hard_header_len + 15);
402 if (new->skb == NULL)
403 goto fail_w_fi;
404
405 skb_reserve(new->skb, (net->hard_header_len + 15) & ~15);
406 new->pbuf = skb_put(new->skb, dg_size);
407 memcpy(new->pbuf + frag_off, frag_buf, frag_len);
408 list_add_tail(&new->pd_link, &peer->pd_list);
409
410 return new;
411
412 fail_w_fi:
413 kfree(fi);
414 fail_w_new:
415 kfree(new);
416 fail:
417 fw_error("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 = min(max_rec, 0xbU); /* <= 4096 */
506 if (max_rec < 8) {
507 fw_notify("max_rec %x out of range\n", max_rec);
508 max_rec = 8;
509 }
510
511 return (1 << (max_rec + 1)) - RFC2374_FRAG_HDR_SIZE;
512 }
513
514
515 static int fwnet_finish_incoming_packet(struct net_device *net,
516 struct sk_buff *skb, u16 source_node_id,
517 bool is_broadcast, u16 ether_type)
518 {
519 struct fwnet_device *dev;
520 static const __be64 broadcast_hw = cpu_to_be64(~0ULL);
521 int status;
522 __be64 guid;
523
524 dev = netdev_priv(net);
525 /* Write metadata, and then pass to the receive level */
526 skb->dev = net;
527 skb->ip_summed = CHECKSUM_UNNECESSARY; /* don't check it */
528
529 /*
530 * Parse the encapsulation header. This actually does the job of
531 * converting to an ethernet frame header, as well as arp
532 * conversion if needed. ARP conversion is easier in this
533 * direction, since we are using ethernet as our backend.
534 */
535 /*
536 * If this is an ARP packet, convert it. First, we want to make
537 * use of some of the fields, since they tell us a little bit
538 * about the sending machine.
539 */
540 if (ether_type == ETH_P_ARP) {
541 struct rfc2734_arp *arp1394;
542 struct arphdr *arp;
543 unsigned char *arp_ptr;
544 u64 fifo_addr;
545 u64 peer_guid;
546 unsigned sspd;
547 u16 max_payload;
548 struct fwnet_peer *peer;
549 unsigned long flags;
550
551 arp1394 = (struct rfc2734_arp *)skb->data;
552 arp = (struct arphdr *)skb->data;
553 arp_ptr = (unsigned char *)(arp + 1);
554 peer_guid = get_unaligned_be64(&arp1394->s_uniq_id);
555 fifo_addr = (u64)get_unaligned_be16(&arp1394->fifo_hi) << 32
556 | get_unaligned_be32(&arp1394->fifo_lo);
557
558 sspd = arp1394->sspd;
559 /* Sanity check. OS X 10.3 PPC reportedly sends 131. */
560 if (sspd > SCODE_3200) {
561 fw_notify("sspd %x out of range\n", sspd);
562 sspd = SCODE_3200;
563 }
564 max_payload = fwnet_max_payload(arp1394->max_rec, sspd);
565
566 spin_lock_irqsave(&dev->lock, flags);
567 peer = fwnet_peer_find_by_guid(dev, peer_guid);
568 if (peer) {
569 peer->fifo = fifo_addr;
570
571 if (peer->speed > sspd)
572 peer->speed = sspd;
573 if (peer->max_payload > max_payload)
574 peer->max_payload = max_payload;
575
576 peer->ip = arp1394->sip;
577 }
578 spin_unlock_irqrestore(&dev->lock, flags);
579
580 if (!peer) {
581 fw_notify("No peer for ARP packet from %016llx\n",
582 (unsigned long long)peer_guid);
583 goto no_peer;
584 }
585
586 /*
587 * Now that we're done with the 1394 specific stuff, we'll
588 * need to alter some of the data. Believe it or not, all
589 * that needs to be done is sender_IP_address needs to be
590 * moved, the destination hardware address get stuffed
591 * in and the hardware address length set to 8.
592 *
593 * IMPORTANT: The code below overwrites 1394 specific data
594 * needed above so keep the munging of the data for the
595 * higher level IP stack last.
596 */
597
598 arp->ar_hln = 8;
599 /* skip over sender unique id */
600 arp_ptr += arp->ar_hln;
601 /* move sender IP addr */
602 put_unaligned(arp1394->sip, (u32 *)arp_ptr);
603 /* skip over sender IP addr */
604 arp_ptr += arp->ar_pln;
605
606 if (arp->ar_op == htons(ARPOP_REQUEST))
607 memset(arp_ptr, 0, sizeof(u64));
608 else
609 memcpy(arp_ptr, net->dev_addr, sizeof(u64));
610 }
611
612 /* Now add the ethernet header. */
613 guid = cpu_to_be64(dev->card->guid);
614 if (dev_hard_header(skb, net, ether_type,
615 is_broadcast ? &broadcast_hw : &guid,
616 NULL, skb->len) >= 0) {
617 struct fwnet_header *eth;
618 u16 *rawp;
619 __be16 protocol;
620
621 skb_reset_mac_header(skb);
622 skb_pull(skb, sizeof(*eth));
623 eth = (struct fwnet_header *)skb_mac_header(skb);
624 if (*eth->h_dest & 1) {
625 if (memcmp(eth->h_dest, net->broadcast,
626 net->addr_len) == 0)
627 skb->pkt_type = PACKET_BROADCAST;
628 #if 0
629 else
630 skb->pkt_type = PACKET_MULTICAST;
631 #endif
632 } else {
633 if (memcmp(eth->h_dest, net->dev_addr, net->addr_len))
634 skb->pkt_type = PACKET_OTHERHOST;
635 }
636 if (ntohs(eth->h_proto) >= 1536) {
637 protocol = eth->h_proto;
638 } else {
639 rawp = (u16 *)skb->data;
640 if (*rawp == 0xffff)
641 protocol = htons(ETH_P_802_3);
642 else
643 protocol = htons(ETH_P_802_2);
644 }
645 skb->protocol = protocol;
646 }
647 status = netif_rx(skb);
648 if (status == NET_RX_DROP) {
649 net->stats.rx_errors++;
650 net->stats.rx_dropped++;
651 } else {
652 net->stats.rx_packets++;
653 net->stats.rx_bytes += skb->len;
654 }
655
656 return 0;
657
658 no_peer:
659 net->stats.rx_errors++;
660 net->stats.rx_dropped++;
661
662 dev_kfree_skb_any(skb);
663
664 return -ENOENT;
665 }
666
667 static int fwnet_incoming_packet(struct fwnet_device *dev, __be32 *buf, int len,
668 int source_node_id, int generation,
669 bool is_broadcast)
670 {
671 struct sk_buff *skb;
672 struct net_device *net = dev->netdev;
673 struct rfc2734_header hdr;
674 unsigned lf;
675 unsigned long flags;
676 struct fwnet_peer *peer;
677 struct fwnet_partial_datagram *pd;
678 int fg_off;
679 int dg_size;
680 u16 datagram_label;
681 int retval;
682 u16 ether_type;
683
684 hdr.w0 = be32_to_cpu(buf[0]);
685 lf = fwnet_get_hdr_lf(&hdr);
686 if (lf == RFC2374_HDR_UNFRAG) {
687 /*
688 * An unfragmented datagram has been received by the ieee1394
689 * bus. Build an skbuff around it so we can pass it to the
690 * high level network layer.
691 */
692 ether_type = fwnet_get_hdr_ether_type(&hdr);
693 buf++;
694 len -= RFC2374_UNFRAG_HDR_SIZE;
695
696 skb = dev_alloc_skb(len + net->hard_header_len + 15);
697 if (unlikely(!skb)) {
698 fw_error("out of memory\n");
699 net->stats.rx_dropped++;
700
701 return -ENOMEM;
702 }
703 skb_reserve(skb, (net->hard_header_len + 15) & ~15);
704 memcpy(skb_put(skb, len), buf, len);
705
706 return fwnet_finish_incoming_packet(net, skb, source_node_id,
707 is_broadcast, ether_type);
708 }
709 /* A datagram fragment has been received, now the fun begins. */
710 hdr.w1 = ntohl(buf[1]);
711 buf += 2;
712 len -= RFC2374_FRAG_HDR_SIZE;
713 if (lf == RFC2374_HDR_FIRSTFRAG) {
714 ether_type = fwnet_get_hdr_ether_type(&hdr);
715 fg_off = 0;
716 } else {
717 ether_type = 0;
718 fg_off = fwnet_get_hdr_fg_off(&hdr);
719 }
720 datagram_label = fwnet_get_hdr_dgl(&hdr);
721 dg_size = fwnet_get_hdr_dg_size(&hdr); /* ??? + 1 */
722
723 spin_lock_irqsave(&dev->lock, flags);
724
725 peer = fwnet_peer_find_by_node_id(dev, source_node_id, generation);
726 if (!peer) {
727 retval = -ENOENT;
728 goto fail;
729 }
730
731 pd = fwnet_pd_find(peer, datagram_label);
732 if (pd == NULL) {
733 while (peer->pdg_size >= FWNET_MAX_FRAGMENTS) {
734 /* remove the oldest */
735 fwnet_pd_delete(list_first_entry(&peer->pd_list,
736 struct fwnet_partial_datagram, pd_link));
737 peer->pdg_size--;
738 }
739 pd = fwnet_pd_new(net, peer, datagram_label,
740 dg_size, buf, fg_off, len);
741 if (pd == NULL) {
742 retval = -ENOMEM;
743 goto fail;
744 }
745 peer->pdg_size++;
746 } else {
747 if (fwnet_frag_overlap(pd, fg_off, len) ||
748 pd->datagram_size != dg_size) {
749 /*
750 * Differing datagram sizes or overlapping fragments,
751 * discard old datagram and start a new one.
752 */
753 fwnet_pd_delete(pd);
754 pd = fwnet_pd_new(net, peer, datagram_label,
755 dg_size, buf, fg_off, len);
756 if (pd == NULL) {
757 peer->pdg_size--;
758 retval = -ENOMEM;
759 goto fail;
760 }
761 } else {
762 if (!fwnet_pd_update(peer, pd, buf, fg_off, len)) {
763 /*
764 * Couldn't save off fragment anyway
765 * so might as well obliterate the
766 * datagram now.
767 */
768 fwnet_pd_delete(pd);
769 peer->pdg_size--;
770 retval = -ENOMEM;
771 goto fail;
772 }
773 }
774 } /* new datagram or add to existing one */
775
776 if (lf == RFC2374_HDR_FIRSTFRAG)
777 pd->ether_type = ether_type;
778
779 if (fwnet_pd_is_complete(pd)) {
780 ether_type = pd->ether_type;
781 peer->pdg_size--;
782 skb = skb_get(pd->skb);
783 fwnet_pd_delete(pd);
784
785 spin_unlock_irqrestore(&dev->lock, flags);
786
787 return fwnet_finish_incoming_packet(net, skb, source_node_id,
788 false, ether_type);
789 }
790 /*
791 * Datagram is not complete, we're done for the
792 * moment.
793 */
794 retval = 0;
795 fail:
796 spin_unlock_irqrestore(&dev->lock, flags);
797
798 return retval;
799 }
800
801 static void fwnet_receive_packet(struct fw_card *card, struct fw_request *r,
802 int tcode, int destination, int source, int generation,
803 unsigned long long offset, void *payload, size_t length,
804 void *callback_data)
805 {
806 struct fwnet_device *dev = callback_data;
807 int rcode;
808
809 if (destination == IEEE1394_ALL_NODES) {
810 kfree(r);
811
812 return;
813 }
814
815 if (offset != dev->handler.offset)
816 rcode = RCODE_ADDRESS_ERROR;
817 else if (tcode != TCODE_WRITE_BLOCK_REQUEST)
818 rcode = RCODE_TYPE_ERROR;
819 else if (fwnet_incoming_packet(dev, payload, length,
820 source, generation, false) != 0) {
821 fw_error("Incoming packet failure\n");
822 rcode = RCODE_CONFLICT_ERROR;
823 } else
824 rcode = RCODE_COMPLETE;
825
826 fw_send_response(card, r, rcode);
827 }
828
829 static void fwnet_receive_broadcast(struct fw_iso_context *context,
830 u32 cycle, size_t header_length, void *header, void *data)
831 {
832 struct fwnet_device *dev;
833 struct fw_iso_packet packet;
834 struct fw_card *card;
835 __be16 *hdr_ptr;
836 __be32 *buf_ptr;
837 int retval;
838 u32 length;
839 u16 source_node_id;
840 u32 specifier_id;
841 u32 ver;
842 unsigned long offset;
843 unsigned long flags;
844
845 dev = data;
846 card = dev->card;
847 hdr_ptr = header;
848 length = be16_to_cpup(hdr_ptr);
849
850 spin_lock_irqsave(&dev->lock, flags);
851
852 offset = dev->rcv_buffer_size * dev->broadcast_rcv_next_ptr;
853 buf_ptr = dev->broadcast_rcv_buffer_ptrs[dev->broadcast_rcv_next_ptr++];
854 if (dev->broadcast_rcv_next_ptr == dev->num_broadcast_rcv_ptrs)
855 dev->broadcast_rcv_next_ptr = 0;
856
857 spin_unlock_irqrestore(&dev->lock, flags);
858
859 specifier_id = (be32_to_cpu(buf_ptr[0]) & 0xffff) << 8
860 | (be32_to_cpu(buf_ptr[1]) & 0xff000000) >> 24;
861 ver = be32_to_cpu(buf_ptr[1]) & 0xffffff;
862 source_node_id = be32_to_cpu(buf_ptr[0]) >> 16;
863
864 if (specifier_id == IANA_SPECIFIER_ID && ver == RFC2734_SW_VERSION) {
865 buf_ptr += 2;
866 length -= IEEE1394_GASP_HDR_SIZE;
867 fwnet_incoming_packet(dev, buf_ptr, length,
868 source_node_id, -1, true);
869 }
870
871 packet.payload_length = dev->rcv_buffer_size;
872 packet.interrupt = 1;
873 packet.skip = 0;
874 packet.tag = 3;
875 packet.sy = 0;
876 packet.header_length = IEEE1394_GASP_HDR_SIZE;
877
878 spin_lock_irqsave(&dev->lock, flags);
879
880 retval = fw_iso_context_queue(dev->broadcast_rcv_context, &packet,
881 &dev->broadcast_rcv_buffer, offset);
882
883 spin_unlock_irqrestore(&dev->lock, flags);
884
885 if (retval >= 0)
886 fw_iso_context_queue_flush(dev->broadcast_rcv_context);
887 else
888 fw_error("requeue failed\n");
889 }
890
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 /* Caller must hold dev->lock. */
900 static void dec_queued_datagrams(struct fwnet_device *dev)
901 {
902 if (--dev->queued_datagrams == FWNET_MIN_QUEUED_DATAGRAMS)
903 netif_wake_queue(dev->netdev);
904 }
905
906 static int fwnet_send_packet(struct fwnet_packet_task *ptask);
907
908 static void fwnet_transmit_packet_done(struct fwnet_packet_task *ptask)
909 {
910 struct fwnet_device *dev = ptask->dev;
911 struct sk_buff *skb = ptask->skb;
912 unsigned long flags;
913 bool free;
914
915 spin_lock_irqsave(&dev->lock, flags);
916
917 ptask->outstanding_pkts--;
918
919 /* Check whether we or the networking TX soft-IRQ is last user. */
920 free = (ptask->outstanding_pkts == 0 && ptask->enqueued);
921 if (free)
922 dec_queued_datagrams(dev);
923
924 if (ptask->outstanding_pkts == 0) {
925 dev->netdev->stats.tx_packets++;
926 dev->netdev->stats.tx_bytes += skb->len;
927 }
928
929 spin_unlock_irqrestore(&dev->lock, flags);
930
931 if (ptask->outstanding_pkts > 0) {
932 u16 dg_size;
933 u16 fg_off;
934 u16 datagram_label;
935 u16 lf;
936
937 /* Update the ptask to point to the next fragment and send it */
938 lf = fwnet_get_hdr_lf(&ptask->hdr);
939 switch (lf) {
940 case RFC2374_HDR_LASTFRAG:
941 case RFC2374_HDR_UNFRAG:
942 default:
943 fw_error("Outstanding packet %x lf %x, header %x,%x\n",
944 ptask->outstanding_pkts, lf, ptask->hdr.w0,
945 ptask->hdr.w1);
946 BUG();
947
948 case RFC2374_HDR_FIRSTFRAG:
949 /* Set frag type here for future interior fragments */
950 dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
951 fg_off = ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
952 datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
953 break;
954
955 case RFC2374_HDR_INTFRAG:
956 dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
957 fg_off = fwnet_get_hdr_fg_off(&ptask->hdr)
958 + ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
959 datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
960 break;
961 }
962
963 skb_pull(skb, ptask->max_payload);
964 if (ptask->outstanding_pkts > 1) {
965 fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_INTFRAG,
966 dg_size, fg_off, datagram_label);
967 } else {
968 fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_LASTFRAG,
969 dg_size, fg_off, datagram_label);
970 ptask->max_payload = skb->len + RFC2374_FRAG_HDR_SIZE;
971 }
972 fwnet_send_packet(ptask);
973 }
974
975 if (free)
976 fwnet_free_ptask(ptask);
977 }
978
979 static void fwnet_transmit_packet_failed(struct fwnet_packet_task *ptask)
980 {
981 struct fwnet_device *dev = ptask->dev;
982 unsigned long flags;
983 bool free;
984
985 spin_lock_irqsave(&dev->lock, flags);
986
987 /* One fragment failed; don't try to send remaining fragments. */
988 ptask->outstanding_pkts = 0;
989
990 /* Check whether we or the networking TX soft-IRQ is last user. */
991 free = ptask->enqueued;
992 if (free)
993 dec_queued_datagrams(dev);
994
995 dev->netdev->stats.tx_dropped++;
996 dev->netdev->stats.tx_errors++;
997
998 spin_unlock_irqrestore(&dev->lock, flags);
999
1000 if (free)
1001 fwnet_free_ptask(ptask);
1002 }
1003
1004 static void fwnet_write_complete(struct fw_card *card, int rcode,
1005 void *payload, size_t length, void *data)
1006 {
1007 struct fwnet_packet_task *ptask = data;
1008 static unsigned long j;
1009 static int last_rcode, errors_skipped;
1010
1011 if (rcode == RCODE_COMPLETE) {
1012 fwnet_transmit_packet_done(ptask);
1013 } else {
1014 fwnet_transmit_packet_failed(ptask);
1015
1016 if (printk_timed_ratelimit(&j, 1000) || rcode != last_rcode) {
1017 fw_error("fwnet_write_complete: "
1018 "failed: %x (skipped %d)\n", rcode, errors_skipped);
1019
1020 errors_skipped = 0;
1021 last_rcode = rcode;
1022 } else
1023 errors_skipped++;
1024 }
1025 }
1026
1027 static int fwnet_send_packet(struct fwnet_packet_task *ptask)
1028 {
1029 struct fwnet_device *dev;
1030 unsigned tx_len;
1031 struct rfc2734_header *bufhdr;
1032 unsigned long flags;
1033 bool free;
1034
1035 dev = ptask->dev;
1036 tx_len = ptask->max_payload;
1037 switch (fwnet_get_hdr_lf(&ptask->hdr)) {
1038 case RFC2374_HDR_UNFRAG:
1039 bufhdr = (struct rfc2734_header *)
1040 skb_push(ptask->skb, RFC2374_UNFRAG_HDR_SIZE);
1041 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
1042 break;
1043
1044 case RFC2374_HDR_FIRSTFRAG:
1045 case RFC2374_HDR_INTFRAG:
1046 case RFC2374_HDR_LASTFRAG:
1047 bufhdr = (struct rfc2734_header *)
1048 skb_push(ptask->skb, RFC2374_FRAG_HDR_SIZE);
1049 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
1050 put_unaligned_be32(ptask->hdr.w1, &bufhdr->w1);
1051 break;
1052
1053 default:
1054 BUG();
1055 }
1056 if (ptask->dest_node == IEEE1394_ALL_NODES) {
1057 u8 *p;
1058 int generation;
1059 int node_id;
1060
1061 /* ptask->generation may not have been set yet */
1062 generation = dev->card->generation;
1063 smp_rmb();
1064 node_id = dev->card->node_id;
1065
1066 p = skb_push(ptask->skb, 8);
1067 put_unaligned_be32(node_id << 16 | IANA_SPECIFIER_ID >> 8, p);
1068 put_unaligned_be32((IANA_SPECIFIER_ID & 0xff) << 24
1069 | RFC2734_SW_VERSION, &p[4]);
1070
1071 /* We should not transmit if broadcast_channel.valid == 0. */
1072 fw_send_request(dev->card, &ptask->transaction,
1073 TCODE_STREAM_DATA,
1074 fw_stream_packet_destination_id(3,
1075 IEEE1394_BROADCAST_CHANNEL, 0),
1076 generation, SCODE_100, 0ULL, ptask->skb->data,
1077 tx_len + 8, fwnet_write_complete, ptask);
1078
1079 spin_lock_irqsave(&dev->lock, flags);
1080
1081 /* If the AT tasklet already ran, we may be last user. */
1082 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1083 if (!free)
1084 ptask->enqueued = true;
1085 else
1086 dec_queued_datagrams(dev);
1087
1088 spin_unlock_irqrestore(&dev->lock, flags);
1089
1090 goto out;
1091 }
1092
1093 fw_send_request(dev->card, &ptask->transaction,
1094 TCODE_WRITE_BLOCK_REQUEST, ptask->dest_node,
1095 ptask->generation, ptask->speed, ptask->fifo_addr,
1096 ptask->skb->data, tx_len, fwnet_write_complete, ptask);
1097
1098 spin_lock_irqsave(&dev->lock, flags);
1099
1100 /* If the AT tasklet already ran, we may be last user. */
1101 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1102 if (!free)
1103 ptask->enqueued = true;
1104 else
1105 dec_queued_datagrams(dev);
1106
1107 spin_unlock_irqrestore(&dev->lock, flags);
1108
1109 dev->netdev->trans_start = jiffies;
1110 out:
1111 if (free)
1112 fwnet_free_ptask(ptask);
1113
1114 return 0;
1115 }
1116
1117 static int fwnet_broadcast_start(struct fwnet_device *dev)
1118 {
1119 struct fw_iso_context *context;
1120 int retval;
1121 unsigned num_packets;
1122 unsigned max_receive;
1123 struct fw_iso_packet packet;
1124 unsigned long offset;
1125 unsigned u;
1126
1127 if (dev->local_fifo == FWNET_NO_FIFO_ADDR) {
1128 /* outside OHCI posted write area? */
1129 static const struct fw_address_region region = {
1130 .start = 0xffff00000000ULL,
1131 .end = CSR_REGISTER_BASE,
1132 };
1133
1134 dev->handler.length = 4096;
1135 dev->handler.address_callback = fwnet_receive_packet;
1136 dev->handler.callback_data = dev;
1137
1138 retval = fw_core_add_address_handler(&dev->handler, &region);
1139 if (retval < 0)
1140 goto failed_initial;
1141
1142 dev->local_fifo = dev->handler.offset;
1143 }
1144
1145 max_receive = 1U << (dev->card->max_receive + 1);
1146 num_packets = (FWNET_ISO_PAGE_COUNT * PAGE_SIZE) / max_receive;
1147
1148 if (!dev->broadcast_rcv_context) {
1149 void **ptrptr;
1150
1151 context = fw_iso_context_create(dev->card,
1152 FW_ISO_CONTEXT_RECEIVE, IEEE1394_BROADCAST_CHANNEL,
1153 dev->card->link_speed, 8, fwnet_receive_broadcast, dev);
1154 if (IS_ERR(context)) {
1155 retval = PTR_ERR(context);
1156 goto failed_context_create;
1157 }
1158
1159 retval = fw_iso_buffer_init(&dev->broadcast_rcv_buffer,
1160 dev->card, FWNET_ISO_PAGE_COUNT, DMA_FROM_DEVICE);
1161 if (retval < 0)
1162 goto failed_buffer_init;
1163
1164 ptrptr = kmalloc(sizeof(void *) * num_packets, GFP_KERNEL);
1165 if (!ptrptr) {
1166 retval = -ENOMEM;
1167 goto failed_ptrs_alloc;
1168 }
1169
1170 dev->broadcast_rcv_buffer_ptrs = ptrptr;
1171 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++) {
1172 void *ptr;
1173 unsigned v;
1174
1175 ptr = kmap(dev->broadcast_rcv_buffer.pages[u]);
1176 for (v = 0; v < num_packets / FWNET_ISO_PAGE_COUNT; v++)
1177 *ptrptr++ = (void *)
1178 ((char *)ptr + v * max_receive);
1179 }
1180 dev->broadcast_rcv_context = context;
1181 } else {
1182 context = dev->broadcast_rcv_context;
1183 }
1184
1185 packet.payload_length = max_receive;
1186 packet.interrupt = 1;
1187 packet.skip = 0;
1188 packet.tag = 3;
1189 packet.sy = 0;
1190 packet.header_length = IEEE1394_GASP_HDR_SIZE;
1191 offset = 0;
1192
1193 for (u = 0; u < num_packets; u++) {
1194 retval = fw_iso_context_queue(context, &packet,
1195 &dev->broadcast_rcv_buffer, offset);
1196 if (retval < 0)
1197 goto failed_rcv_queue;
1198
1199 offset += max_receive;
1200 }
1201 dev->num_broadcast_rcv_ptrs = num_packets;
1202 dev->rcv_buffer_size = max_receive;
1203 dev->broadcast_rcv_next_ptr = 0U;
1204 retval = fw_iso_context_start(context, -1, 0,
1205 FW_ISO_CONTEXT_MATCH_ALL_TAGS); /* ??? sync */
1206 if (retval < 0)
1207 goto failed_rcv_queue;
1208
1209 /* FIXME: adjust it according to the min. speed of all known peers? */
1210 dev->broadcast_xmt_max_payload = IEEE1394_MAX_PAYLOAD_S100
1211 - IEEE1394_GASP_HDR_SIZE - RFC2374_UNFRAG_HDR_SIZE;
1212 dev->broadcast_state = FWNET_BROADCAST_RUNNING;
1213
1214 return 0;
1215
1216 failed_rcv_queue:
1217 kfree(dev->broadcast_rcv_buffer_ptrs);
1218 dev->broadcast_rcv_buffer_ptrs = NULL;
1219 failed_ptrs_alloc:
1220 fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer, dev->card);
1221 failed_buffer_init:
1222 fw_iso_context_destroy(context);
1223 dev->broadcast_rcv_context = NULL;
1224 failed_context_create:
1225 fw_core_remove_address_handler(&dev->handler);
1226 failed_initial:
1227 dev->local_fifo = FWNET_NO_FIFO_ADDR;
1228
1229 return retval;
1230 }
1231
1232 static void set_carrier_state(struct fwnet_device *dev)
1233 {
1234 if (dev->peer_count > 1)
1235 netif_carrier_on(dev->netdev);
1236 else
1237 netif_carrier_off(dev->netdev);
1238 }
1239
1240 /* ifup */
1241 static int fwnet_open(struct net_device *net)
1242 {
1243 struct fwnet_device *dev = netdev_priv(net);
1244 int ret;
1245
1246 if (dev->broadcast_state == FWNET_BROADCAST_ERROR) {
1247 ret = fwnet_broadcast_start(dev);
1248 if (ret)
1249 return ret;
1250 }
1251 netif_start_queue(net);
1252
1253 spin_lock_irq(&dev->lock);
1254 set_carrier_state(dev);
1255 spin_unlock_irq(&dev->lock);
1256
1257 return 0;
1258 }
1259
1260 /* ifdown */
1261 static int fwnet_stop(struct net_device *net)
1262 {
1263 netif_stop_queue(net);
1264
1265 /* Deallocate iso context for use by other applications? */
1266
1267 return 0;
1268 }
1269
1270 static netdev_tx_t fwnet_tx(struct sk_buff *skb, struct net_device *net)
1271 {
1272 struct fwnet_header hdr_buf;
1273 struct fwnet_device *dev = netdev_priv(net);
1274 __be16 proto;
1275 u16 dest_node;
1276 unsigned max_payload;
1277 u16 dg_size;
1278 u16 *datagram_label_ptr;
1279 struct fwnet_packet_task *ptask;
1280 struct fwnet_peer *peer;
1281 unsigned long flags;
1282
1283 spin_lock_irqsave(&dev->lock, flags);
1284
1285 /* Can this happen? */
1286 if (netif_queue_stopped(dev->netdev)) {
1287 spin_unlock_irqrestore(&dev->lock, flags);
1288
1289 return NETDEV_TX_BUSY;
1290 }
1291
1292 ptask = kmem_cache_alloc(fwnet_packet_task_cache, GFP_ATOMIC);
1293 if (ptask == NULL)
1294 goto fail;
1295
1296 skb = skb_share_check(skb, GFP_ATOMIC);
1297 if (!skb)
1298 goto fail;
1299
1300 /*
1301 * Make a copy of the driver-specific header.
1302 * We might need to rebuild the header on tx failure.
1303 */
1304 memcpy(&hdr_buf, skb->data, sizeof(hdr_buf));
1305 skb_pull(skb, sizeof(hdr_buf));
1306
1307 proto = hdr_buf.h_proto;
1308 dg_size = skb->len;
1309
1310 /*
1311 * Set the transmission type for the packet. ARP packets and IP
1312 * broadcast packets are sent via GASP.
1313 */
1314 if (memcmp(hdr_buf.h_dest, net->broadcast, FWNET_ALEN) == 0
1315 || proto == htons(ETH_P_ARP)
1316 || (proto == htons(ETH_P_IP)
1317 && IN_MULTICAST(ntohl(ip_hdr(skb)->daddr)))) {
1318 max_payload = dev->broadcast_xmt_max_payload;
1319 datagram_label_ptr = &dev->broadcast_xmt_datagramlabel;
1320
1321 ptask->fifo_addr = FWNET_NO_FIFO_ADDR;
1322 ptask->generation = 0;
1323 ptask->dest_node = IEEE1394_ALL_NODES;
1324 ptask->speed = SCODE_100;
1325 } else {
1326 __be64 guid = get_unaligned((__be64 *)hdr_buf.h_dest);
1327 u8 generation;
1328
1329 peer = fwnet_peer_find_by_guid(dev, be64_to_cpu(guid));
1330 if (!peer || peer->fifo == FWNET_NO_FIFO_ADDR)
1331 goto fail;
1332
1333 generation = peer->generation;
1334 dest_node = peer->node_id;
1335 max_payload = peer->max_payload;
1336 datagram_label_ptr = &peer->datagram_label;
1337
1338 ptask->fifo_addr = peer->fifo;
1339 ptask->generation = generation;
1340 ptask->dest_node = dest_node;
1341 ptask->speed = peer->speed;
1342 }
1343
1344 /* If this is an ARP packet, convert it */
1345 if (proto == htons(ETH_P_ARP)) {
1346 struct arphdr *arp = (struct arphdr *)skb->data;
1347 unsigned char *arp_ptr = (unsigned char *)(arp + 1);
1348 struct rfc2734_arp *arp1394 = (struct rfc2734_arp *)skb->data;
1349 __be32 ipaddr;
1350
1351 ipaddr = get_unaligned((__be32 *)(arp_ptr + FWNET_ALEN));
1352
1353 arp1394->hw_addr_len = RFC2734_HW_ADDR_LEN;
1354 arp1394->max_rec = dev->card->max_receive;
1355 arp1394->sspd = dev->card->link_speed;
1356
1357 put_unaligned_be16(dev->local_fifo >> 32,
1358 &arp1394->fifo_hi);
1359 put_unaligned_be32(dev->local_fifo & 0xffffffff,
1360 &arp1394->fifo_lo);
1361 put_unaligned(ipaddr, &arp1394->sip);
1362 }
1363
1364 ptask->hdr.w0 = 0;
1365 ptask->hdr.w1 = 0;
1366 ptask->skb = skb;
1367 ptask->dev = dev;
1368
1369 /* Does it all fit in one packet? */
1370 if (dg_size <= max_payload) {
1371 fwnet_make_uf_hdr(&ptask->hdr, ntohs(proto));
1372 ptask->outstanding_pkts = 1;
1373 max_payload = dg_size + RFC2374_UNFRAG_HDR_SIZE;
1374 } else {
1375 u16 datagram_label;
1376
1377 max_payload -= RFC2374_FRAG_OVERHEAD;
1378 datagram_label = (*datagram_label_ptr)++;
1379 fwnet_make_ff_hdr(&ptask->hdr, ntohs(proto), dg_size,
1380 datagram_label);
1381 ptask->outstanding_pkts = DIV_ROUND_UP(dg_size, max_payload);
1382 max_payload += RFC2374_FRAG_HDR_SIZE;
1383 }
1384
1385 if (++dev->queued_datagrams == FWNET_MAX_QUEUED_DATAGRAMS)
1386 netif_stop_queue(dev->netdev);
1387
1388 spin_unlock_irqrestore(&dev->lock, flags);
1389
1390 ptask->max_payload = max_payload;
1391 ptask->enqueued = 0;
1392
1393 fwnet_send_packet(ptask);
1394
1395 return NETDEV_TX_OK;
1396
1397 fail:
1398 spin_unlock_irqrestore(&dev->lock, flags);
1399
1400 if (ptask)
1401 kmem_cache_free(fwnet_packet_task_cache, ptask);
1402
1403 if (skb != NULL)
1404 dev_kfree_skb(skb);
1405
1406 net->stats.tx_dropped++;
1407 net->stats.tx_errors++;
1408
1409 /*
1410 * FIXME: According to a patch from 2003-02-26, "returning non-zero
1411 * causes serious problems" here, allegedly. Before that patch,
1412 * -ERRNO was returned which is not appropriate under Linux 2.6.
1413 * Perhaps more needs to be done? Stop the queue in serious
1414 * conditions and restart it elsewhere?
1415 */
1416 return NETDEV_TX_OK;
1417 }
1418
1419 static int fwnet_change_mtu(struct net_device *net, int new_mtu)
1420 {
1421 if (new_mtu < 68)
1422 return -EINVAL;
1423
1424 net->mtu = new_mtu;
1425 return 0;
1426 }
1427
1428 static const struct ethtool_ops fwnet_ethtool_ops = {
1429 .get_link = ethtool_op_get_link,
1430 };
1431
1432 static const struct net_device_ops fwnet_netdev_ops = {
1433 .ndo_open = fwnet_open,
1434 .ndo_stop = fwnet_stop,
1435 .ndo_start_xmit = fwnet_tx,
1436 .ndo_change_mtu = fwnet_change_mtu,
1437 };
1438
1439 static void fwnet_init_dev(struct net_device *net)
1440 {
1441 net->header_ops = &fwnet_header_ops;
1442 net->netdev_ops = &fwnet_netdev_ops;
1443 net->watchdog_timeo = 2 * HZ;
1444 net->flags = IFF_BROADCAST | IFF_MULTICAST;
1445 net->features = NETIF_F_HIGHDMA;
1446 net->addr_len = FWNET_ALEN;
1447 net->hard_header_len = FWNET_HLEN;
1448 net->type = ARPHRD_IEEE1394;
1449 net->tx_queue_len = FWNET_TX_QUEUE_LEN;
1450 net->ethtool_ops = &fwnet_ethtool_ops;
1451 }
1452
1453 /* caller must hold fwnet_device_mutex */
1454 static struct fwnet_device *fwnet_dev_find(struct fw_card *card)
1455 {
1456 struct fwnet_device *dev;
1457
1458 list_for_each_entry(dev, &fwnet_device_list, dev_link)
1459 if (dev->card == card)
1460 return dev;
1461
1462 return NULL;
1463 }
1464
1465 static int fwnet_add_peer(struct fwnet_device *dev,
1466 struct fw_unit *unit, struct fw_device *device)
1467 {
1468 struct fwnet_peer *peer;
1469
1470 peer = kmalloc(sizeof(*peer), GFP_KERNEL);
1471 if (!peer)
1472 return -ENOMEM;
1473
1474 dev_set_drvdata(&unit->device, peer);
1475
1476 peer->dev = dev;
1477 peer->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4];
1478 peer->fifo = FWNET_NO_FIFO_ADDR;
1479 peer->ip = 0;
1480 INIT_LIST_HEAD(&peer->pd_list);
1481 peer->pdg_size = 0;
1482 peer->datagram_label = 0;
1483 peer->speed = device->max_speed;
1484 peer->max_payload = fwnet_max_payload(device->max_rec, peer->speed);
1485
1486 peer->generation = device->generation;
1487 smp_rmb();
1488 peer->node_id = device->node_id;
1489
1490 spin_lock_irq(&dev->lock);
1491 list_add_tail(&peer->peer_link, &dev->peer_list);
1492 dev->peer_count++;
1493 set_carrier_state(dev);
1494 spin_unlock_irq(&dev->lock);
1495
1496 return 0;
1497 }
1498
1499 static int fwnet_probe(struct device *_dev)
1500 {
1501 struct fw_unit *unit = fw_unit(_dev);
1502 struct fw_device *device = fw_parent_device(unit);
1503 struct fw_card *card = device->card;
1504 struct net_device *net;
1505 bool allocated_netdev = false;
1506 struct fwnet_device *dev;
1507 unsigned max_mtu;
1508 int ret;
1509
1510 mutex_lock(&fwnet_device_mutex);
1511
1512 dev = fwnet_dev_find(card);
1513 if (dev) {
1514 net = dev->netdev;
1515 goto have_dev;
1516 }
1517
1518 net = alloc_netdev(sizeof(*dev), "firewire%d", fwnet_init_dev);
1519 if (net == NULL) {
1520 ret = -ENOMEM;
1521 goto out;
1522 }
1523
1524 allocated_netdev = true;
1525 SET_NETDEV_DEV(net, card->device);
1526 dev = netdev_priv(net);
1527
1528 spin_lock_init(&dev->lock);
1529 dev->broadcast_state = FWNET_BROADCAST_ERROR;
1530 dev->broadcast_rcv_context = NULL;
1531 dev->broadcast_xmt_max_payload = 0;
1532 dev->broadcast_xmt_datagramlabel = 0;
1533 dev->local_fifo = FWNET_NO_FIFO_ADDR;
1534 dev->queued_datagrams = 0;
1535 INIT_LIST_HEAD(&dev->peer_list);
1536 dev->card = card;
1537 dev->netdev = net;
1538
1539 /*
1540 * Use the RFC 2734 default 1500 octets or the maximum payload
1541 * as initial MTU
1542 */
1543 max_mtu = (1 << (card->max_receive + 1))
1544 - sizeof(struct rfc2734_header) - IEEE1394_GASP_HDR_SIZE;
1545 net->mtu = min(1500U, max_mtu);
1546
1547 /* Set our hardware address while we're at it */
1548 put_unaligned_be64(card->guid, net->dev_addr);
1549 put_unaligned_be64(~0ULL, net->broadcast);
1550 ret = register_netdev(net);
1551 if (ret) {
1552 fw_error("Cannot register the driver\n");
1553 goto out;
1554 }
1555
1556 list_add_tail(&dev->dev_link, &fwnet_device_list);
1557 fw_notify("%s: IPv4 over FireWire on device %016llx\n",
1558 net->name, (unsigned long long)card->guid);
1559 have_dev:
1560 ret = fwnet_add_peer(dev, unit, device);
1561 if (ret && allocated_netdev) {
1562 unregister_netdev(net);
1563 list_del(&dev->dev_link);
1564 }
1565 out:
1566 if (ret && allocated_netdev)
1567 free_netdev(net);
1568
1569 mutex_unlock(&fwnet_device_mutex);
1570
1571 return ret;
1572 }
1573
1574 static void fwnet_remove_peer(struct fwnet_peer *peer, struct fwnet_device *dev)
1575 {
1576 struct fwnet_partial_datagram *pd, *pd_next;
1577
1578 spin_lock_irq(&dev->lock);
1579 list_del(&peer->peer_link);
1580 dev->peer_count--;
1581 set_carrier_state(dev);
1582 spin_unlock_irq(&dev->lock);
1583
1584 list_for_each_entry_safe(pd, pd_next, &peer->pd_list, pd_link)
1585 fwnet_pd_delete(pd);
1586
1587 kfree(peer);
1588 }
1589
1590 static int fwnet_remove(struct device *_dev)
1591 {
1592 struct fwnet_peer *peer = dev_get_drvdata(_dev);
1593 struct fwnet_device *dev = peer->dev;
1594 struct net_device *net;
1595 int i;
1596
1597 mutex_lock(&fwnet_device_mutex);
1598
1599 net = dev->netdev;
1600 if (net && peer->ip)
1601 arp_invalidate(net, peer->ip);
1602
1603 fwnet_remove_peer(peer, dev);
1604
1605 if (list_empty(&dev->peer_list)) {
1606 unregister_netdev(net);
1607
1608 if (dev->local_fifo != FWNET_NO_FIFO_ADDR)
1609 fw_core_remove_address_handler(&dev->handler);
1610 if (dev->broadcast_rcv_context) {
1611 fw_iso_context_stop(dev->broadcast_rcv_context);
1612 fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer,
1613 dev->card);
1614 fw_iso_context_destroy(dev->broadcast_rcv_context);
1615 }
1616 for (i = 0; dev->queued_datagrams && i < 5; i++)
1617 ssleep(1);
1618 WARN_ON(dev->queued_datagrams);
1619 list_del(&dev->dev_link);
1620
1621 free_netdev(net);
1622 }
1623
1624 mutex_unlock(&fwnet_device_mutex);
1625
1626 return 0;
1627 }
1628
1629 /*
1630 * FIXME abort partially sent fragmented datagrams,
1631 * discard partially received fragmented datagrams
1632 */
1633 static void fwnet_update(struct fw_unit *unit)
1634 {
1635 struct fw_device *device = fw_parent_device(unit);
1636 struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1637 int generation;
1638
1639 generation = device->generation;
1640
1641 spin_lock_irq(&peer->dev->lock);
1642 peer->node_id = device->node_id;
1643 peer->generation = generation;
1644 spin_unlock_irq(&peer->dev->lock);
1645 }
1646
1647 static const struct ieee1394_device_id fwnet_id_table[] = {
1648 {
1649 .match_flags = IEEE1394_MATCH_SPECIFIER_ID |
1650 IEEE1394_MATCH_VERSION,
1651 .specifier_id = IANA_SPECIFIER_ID,
1652 .version = RFC2734_SW_VERSION,
1653 },
1654 { }
1655 };
1656
1657 static struct fw_driver fwnet_driver = {
1658 .driver = {
1659 .owner = THIS_MODULE,
1660 .name = "net",
1661 .bus = &fw_bus_type,
1662 .probe = fwnet_probe,
1663 .remove = fwnet_remove,
1664 },
1665 .update = fwnet_update,
1666 .id_table = fwnet_id_table,
1667 };
1668
1669 static const u32 rfc2374_unit_directory_data[] = {
1670 0x00040000, /* directory_length */
1671 0x1200005e, /* unit_specifier_id: IANA */
1672 0x81000003, /* textual descriptor offset */
1673 0x13000001, /* unit_sw_version: RFC 2734 */
1674 0x81000005, /* textual descriptor offset */
1675 0x00030000, /* descriptor_length */
1676 0x00000000, /* text */
1677 0x00000000, /* minimal ASCII, en */
1678 0x49414e41, /* I A N A */
1679 0x00030000, /* descriptor_length */
1680 0x00000000, /* text */
1681 0x00000000, /* minimal ASCII, en */
1682 0x49507634, /* I P v 4 */
1683 };
1684
1685 static struct fw_descriptor rfc2374_unit_directory = {
1686 .length = ARRAY_SIZE(rfc2374_unit_directory_data),
1687 .key = (CSR_DIRECTORY | CSR_UNIT) << 24,
1688 .data = rfc2374_unit_directory_data
1689 };
1690
1691 static int __init fwnet_init(void)
1692 {
1693 int err;
1694
1695 err = fw_core_add_descriptor(&rfc2374_unit_directory);
1696 if (err)
1697 return err;
1698
1699 fwnet_packet_task_cache = kmem_cache_create("packet_task",
1700 sizeof(struct fwnet_packet_task), 0, 0, NULL);
1701 if (!fwnet_packet_task_cache) {
1702 err = -ENOMEM;
1703 goto out;
1704 }
1705
1706 err = driver_register(&fwnet_driver.driver);
1707 if (!err)
1708 return 0;
1709
1710 kmem_cache_destroy(fwnet_packet_task_cache);
1711 out:
1712 fw_core_remove_descriptor(&rfc2374_unit_directory);
1713
1714 return err;
1715 }
1716 module_init(fwnet_init);
1717
1718 static void __exit fwnet_cleanup(void)
1719 {
1720 driver_unregister(&fwnet_driver.driver);
1721 kmem_cache_destroy(fwnet_packet_task_cache);
1722 fw_core_remove_descriptor(&rfc2374_unit_directory);
1723 }
1724 module_exit(fwnet_cleanup);
1725
1726 MODULE_AUTHOR("Jay Fenlason <fenlason@redhat.com>");
1727 MODULE_DESCRIPTION("IPv4 over IEEE1394 as per RFC 2734");
1728 MODULE_LICENSE("GPL");
1729 MODULE_DEVICE_TABLE(ieee1394, fwnet_id_table);
linux-next