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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / drivers / firewire / net.c
bloba20f45b1e7e5a79509f08da27384705bbc915a19
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 = clamp(max_rec, 8U, 11U); /* 512...4096 */
506
507 return (1 << (max_rec + 1)) - RFC2374_FRAG_HDR_SIZE;
508 }
509
510
511 static int fwnet_finish_incoming_packet(struct net_device *net,
512 struct sk_buff *skb, u16 source_node_id,
513 bool is_broadcast, u16 ether_type)
514 {
515 struct fwnet_device *dev;
516 static const __be64 broadcast_hw = cpu_to_be64(~0ULL);
517 int status;
518 __be64 guid;
519
520 dev = netdev_priv(net);
521 /* Write metadata, and then pass to the receive level */
522 skb->dev = net;
523 skb->ip_summed = CHECKSUM_UNNECESSARY; /* don't check it */
524
525 /*
526 * Parse the encapsulation header. This actually does the job of
527 * converting to an ethernet frame header, as well as arp
528 * conversion if needed. ARP conversion is easier in this
529 * direction, since we are using ethernet as our backend.
530 */
531 /*
532 * If this is an ARP packet, convert it. First, we want to make
533 * use of some of the fields, since they tell us a little bit
534 * about the sending machine.
535 */
536 if (ether_type == ETH_P_ARP) {
537 struct rfc2734_arp *arp1394;
538 struct arphdr *arp;
539 unsigned char *arp_ptr;
540 u64 fifo_addr;
541 u64 peer_guid;
542 unsigned sspd;
543 u16 max_payload;
544 struct fwnet_peer *peer;
545 unsigned long flags;
546
547 arp1394 = (struct rfc2734_arp *)skb->data;
548 arp = (struct arphdr *)skb->data;
549 arp_ptr = (unsigned char *)(arp + 1);
550 peer_guid = get_unaligned_be64(&arp1394->s_uniq_id);
551 fifo_addr = (u64)get_unaligned_be16(&arp1394->fifo_hi) << 32
552 | get_unaligned_be32(&arp1394->fifo_lo);
553
554 sspd = arp1394->sspd;
555 /* Sanity check. OS X 10.3 PPC reportedly sends 131. */
556 if (sspd > SCODE_3200) {
557 fw_notify("sspd %x out of range\n", sspd);
558 sspd = SCODE_3200;
559 }
560 max_payload = fwnet_max_payload(arp1394->max_rec, sspd);
561
562 spin_lock_irqsave(&dev->lock, flags);
563 peer = fwnet_peer_find_by_guid(dev, peer_guid);
564 if (peer) {
565 peer->fifo = fifo_addr;
566
567 if (peer->speed > sspd)
568 peer->speed = sspd;
569 if (peer->max_payload > max_payload)
570 peer->max_payload = max_payload;
571
572 peer->ip = arp1394->sip;
573 }
574 spin_unlock_irqrestore(&dev->lock, flags);
575
576 if (!peer) {
577 fw_notify("No peer for ARP packet from %016llx\n",
578 (unsigned long long)peer_guid);
579 goto no_peer;
580 }
581
582 /*
583 * Now that we're done with the 1394 specific stuff, we'll
584 * need to alter some of the data. Believe it or not, all
585 * that needs to be done is sender_IP_address needs to be
586 * moved, the destination hardware address get stuffed
587 * in and the hardware address length set to 8.
588 *
589 * IMPORTANT: The code below overwrites 1394 specific data
590 * needed above so keep the munging of the data for the
591 * higher level IP stack last.
592 */
593
594 arp->ar_hln = 8;
595 /* skip over sender unique id */
596 arp_ptr += arp->ar_hln;
597 /* move sender IP addr */
598 put_unaligned(arp1394->sip, (u32 *)arp_ptr);
599 /* skip over sender IP addr */
600 arp_ptr += arp->ar_pln;
601
602 if (arp->ar_op == htons(ARPOP_REQUEST))
603 memset(arp_ptr, 0, sizeof(u64));
604 else
605 memcpy(arp_ptr, net->dev_addr, sizeof(u64));
606 }
607
608 /* Now add the ethernet header. */
609 guid = cpu_to_be64(dev->card->guid);
610 if (dev_hard_header(skb, net, ether_type,
611 is_broadcast ? &broadcast_hw : &guid,
612 NULL, skb->len) >= 0) {
613 struct fwnet_header *eth;
614 u16 *rawp;
615 __be16 protocol;
616
617 skb_reset_mac_header(skb);
618 skb_pull(skb, sizeof(*eth));
619 eth = (struct fwnet_header *)skb_mac_header(skb);
620 if (*eth->h_dest & 1) {
621 if (memcmp(eth->h_dest, net->broadcast,
622 net->addr_len) == 0)
623 skb->pkt_type = PACKET_BROADCAST;
624 #if 0
625 else
626 skb->pkt_type = PACKET_MULTICAST;
627 #endif
628 } else {
629 if (memcmp(eth->h_dest, net->dev_addr, net->addr_len))
630 skb->pkt_type = PACKET_OTHERHOST;
631 }
632 if (ntohs(eth->h_proto) >= 1536) {
633 protocol = eth->h_proto;
634 } else {
635 rawp = (u16 *)skb->data;
636 if (*rawp == 0xffff)
637 protocol = htons(ETH_P_802_3);
638 else
639 protocol = htons(ETH_P_802_2);
640 }
641 skb->protocol = protocol;
642 }
643 status = netif_rx(skb);
644 if (status == NET_RX_DROP) {
645 net->stats.rx_errors++;
646 net->stats.rx_dropped++;
647 } else {
648 net->stats.rx_packets++;
649 net->stats.rx_bytes += skb->len;
650 }
651
652 return 0;
653
654 no_peer:
655 net->stats.rx_errors++;
656 net->stats.rx_dropped++;
657
658 dev_kfree_skb_any(skb);
659
660 return -ENOENT;
661 }
662
663 static int fwnet_incoming_packet(struct fwnet_device *dev, __be32 *buf, int len,
664 int source_node_id, int generation,
665 bool is_broadcast)
666 {
667 struct sk_buff *skb;
668 struct net_device *net = dev->netdev;
669 struct rfc2734_header hdr;
670 unsigned lf;
671 unsigned long flags;
672 struct fwnet_peer *peer;
673 struct fwnet_partial_datagram *pd;
674 int fg_off;
675 int dg_size;
676 u16 datagram_label;
677 int retval;
678 u16 ether_type;
679
680 hdr.w0 = be32_to_cpu(buf[0]);
681 lf = fwnet_get_hdr_lf(&hdr);
682 if (lf == RFC2374_HDR_UNFRAG) {
683 /*
684 * An unfragmented datagram has been received by the ieee1394
685 * bus. Build an skbuff around it so we can pass it to the
686 * high level network layer.
687 */
688 ether_type = fwnet_get_hdr_ether_type(&hdr);
689 buf++;
690 len -= RFC2374_UNFRAG_HDR_SIZE;
691
692 skb = dev_alloc_skb(len + net->hard_header_len + 15);
693 if (unlikely(!skb)) {
694 fw_error("out of memory\n");
695 net->stats.rx_dropped++;
696
697 return -ENOMEM;
698 }
699 skb_reserve(skb, (net->hard_header_len + 15) & ~15);
700 memcpy(skb_put(skb, len), buf, len);
701
702 return fwnet_finish_incoming_packet(net, skb, source_node_id,
703 is_broadcast, ether_type);
704 }
705 /* A datagram fragment has been received, now the fun begins. */
706 hdr.w1 = ntohl(buf[1]);
707 buf += 2;
708 len -= RFC2374_FRAG_HDR_SIZE;
709 if (lf == RFC2374_HDR_FIRSTFRAG) {
710 ether_type = fwnet_get_hdr_ether_type(&hdr);
711 fg_off = 0;
712 } else {
713 ether_type = 0;
714 fg_off = fwnet_get_hdr_fg_off(&hdr);
715 }
716 datagram_label = fwnet_get_hdr_dgl(&hdr);
717 dg_size = fwnet_get_hdr_dg_size(&hdr); /* ??? + 1 */
718
719 spin_lock_irqsave(&dev->lock, flags);
720
721 peer = fwnet_peer_find_by_node_id(dev, source_node_id, generation);
722 if (!peer) {
723 retval = -ENOENT;
724 goto fail;
725 }
726
727 pd = fwnet_pd_find(peer, datagram_label);
728 if (pd == NULL) {
729 while (peer->pdg_size >= FWNET_MAX_FRAGMENTS) {
730 /* remove the oldest */
731 fwnet_pd_delete(list_first_entry(&peer->pd_list,
732 struct fwnet_partial_datagram, pd_link));
733 peer->pdg_size--;
734 }
735 pd = fwnet_pd_new(net, peer, datagram_label,
736 dg_size, buf, fg_off, len);
737 if (pd == NULL) {
738 retval = -ENOMEM;
739 goto fail;
740 }
741 peer->pdg_size++;
742 } else {
743 if (fwnet_frag_overlap(pd, fg_off, len) ||
744 pd->datagram_size != dg_size) {
745 /*
746 * Differing datagram sizes or overlapping fragments,
747 * discard old datagram and start a new one.
748 */
749 fwnet_pd_delete(pd);
750 pd = fwnet_pd_new(net, peer, datagram_label,
751 dg_size, buf, fg_off, len);
752 if (pd == NULL) {
753 peer->pdg_size--;
754 retval = -ENOMEM;
755 goto fail;
756 }
757 } else {
758 if (!fwnet_pd_update(peer, pd, buf, fg_off, len)) {
759 /*
760 * Couldn't save off fragment anyway
761 * so might as well obliterate the
762 * datagram now.
763 */
764 fwnet_pd_delete(pd);
765 peer->pdg_size--;
766 retval = -ENOMEM;
767 goto fail;
768 }
769 }
770 } /* new datagram or add to existing one */
771
772 if (lf == RFC2374_HDR_FIRSTFRAG)
773 pd->ether_type = ether_type;
774
775 if (fwnet_pd_is_complete(pd)) {
776 ether_type = pd->ether_type;
777 peer->pdg_size--;
778 skb = skb_get(pd->skb);
779 fwnet_pd_delete(pd);
780
781 spin_unlock_irqrestore(&dev->lock, flags);
782
783 return fwnet_finish_incoming_packet(net, skb, source_node_id,
784 false, ether_type);
785 }
786 /*
787 * Datagram is not complete, we're done for the
788 * moment.
789 */
790 retval = 0;
791 fail:
792 spin_unlock_irqrestore(&dev->lock, flags);
793
794 return retval;
795 }
796
797 static void fwnet_receive_packet(struct fw_card *card, struct fw_request *r,
798 int tcode, int destination, int source, int generation,
799 unsigned long long offset, void *payload, size_t length,
800 void *callback_data)
801 {
802 struct fwnet_device *dev = callback_data;
803 int rcode;
804
805 if (destination == IEEE1394_ALL_NODES) {
806 kfree(r);
807
808 return;
809 }
810
811 if (offset != dev->handler.offset)
812 rcode = RCODE_ADDRESS_ERROR;
813 else if (tcode != TCODE_WRITE_BLOCK_REQUEST)
814 rcode = RCODE_TYPE_ERROR;
815 else if (fwnet_incoming_packet(dev, payload, length,
816 source, generation, false) != 0) {
817 fw_error("Incoming packet failure\n");
818 rcode = RCODE_CONFLICT_ERROR;
819 } else
820 rcode = RCODE_COMPLETE;
821
822 fw_send_response(card, r, rcode);
823 }
824
825 static void fwnet_receive_broadcast(struct fw_iso_context *context,
826 u32 cycle, size_t header_length, void *header, void *data)
827 {
828 struct fwnet_device *dev;
829 struct fw_iso_packet packet;
830 struct fw_card *card;
831 __be16 *hdr_ptr;
832 __be32 *buf_ptr;
833 int retval;
834 u32 length;
835 u16 source_node_id;
836 u32 specifier_id;
837 u32 ver;
838 unsigned long offset;
839 unsigned long flags;
840
841 dev = data;
842 card = dev->card;
843 hdr_ptr = header;
844 length = be16_to_cpup(hdr_ptr);
845
846 spin_lock_irqsave(&dev->lock, flags);
847
848 offset = dev->rcv_buffer_size * dev->broadcast_rcv_next_ptr;
849 buf_ptr = dev->broadcast_rcv_buffer_ptrs[dev->broadcast_rcv_next_ptr++];
850 if (dev->broadcast_rcv_next_ptr == dev->num_broadcast_rcv_ptrs)
851 dev->broadcast_rcv_next_ptr = 0;
852
853 spin_unlock_irqrestore(&dev->lock, flags);
854
855 specifier_id = (be32_to_cpu(buf_ptr[0]) & 0xffff) << 8
856 | (be32_to_cpu(buf_ptr[1]) & 0xff000000) >> 24;
857 ver = be32_to_cpu(buf_ptr[1]) & 0xffffff;
858 source_node_id = be32_to_cpu(buf_ptr[0]) >> 16;
859
860 if (specifier_id == IANA_SPECIFIER_ID && ver == RFC2734_SW_VERSION) {
861 buf_ptr += 2;
862 length -= IEEE1394_GASP_HDR_SIZE;
863 fwnet_incoming_packet(dev, buf_ptr, length,
864 source_node_id, -1, true);
865 }
866
867 packet.payload_length = dev->rcv_buffer_size;
868 packet.interrupt = 1;
869 packet.skip = 0;
870 packet.tag = 3;
871 packet.sy = 0;
872 packet.header_length = IEEE1394_GASP_HDR_SIZE;
873
874 spin_lock_irqsave(&dev->lock, flags);
875
876 retval = fw_iso_context_queue(dev->broadcast_rcv_context, &packet,
877 &dev->broadcast_rcv_buffer, offset);
878
879 spin_unlock_irqrestore(&dev->lock, flags);
880
881 if (retval >= 0)
882 fw_iso_context_queue_flush(dev->broadcast_rcv_context);
883 else
884 fw_error("requeue failed\n");
885 }
886
887 static struct kmem_cache *fwnet_packet_task_cache;
888
889 static void fwnet_free_ptask(struct fwnet_packet_task *ptask)
890 {
891 dev_kfree_skb_any(ptask->skb);
892 kmem_cache_free(fwnet_packet_task_cache, ptask);
893 }
894
895 /* Caller must hold dev->lock. */
896 static void dec_queued_datagrams(struct fwnet_device *dev)
897 {
898 if (--dev->queued_datagrams == FWNET_MIN_QUEUED_DATAGRAMS)
899 netif_wake_queue(dev->netdev);
900 }
901
902 static int fwnet_send_packet(struct fwnet_packet_task *ptask);
903
904 static void fwnet_transmit_packet_done(struct fwnet_packet_task *ptask)
905 {
906 struct fwnet_device *dev = ptask->dev;
907 struct sk_buff *skb = ptask->skb;
908 unsigned long flags;
909 bool free;
910
911 spin_lock_irqsave(&dev->lock, flags);
912
913 ptask->outstanding_pkts--;
914
915 /* Check whether we or the networking TX soft-IRQ is last user. */
916 free = (ptask->outstanding_pkts == 0 && ptask->enqueued);
917 if (free)
918 dec_queued_datagrams(dev);
919
920 if (ptask->outstanding_pkts == 0) {
921 dev->netdev->stats.tx_packets++;
922 dev->netdev->stats.tx_bytes += skb->len;
923 }
924
925 spin_unlock_irqrestore(&dev->lock, flags);
926
927 if (ptask->outstanding_pkts > 0) {
928 u16 dg_size;
929 u16 fg_off;
930 u16 datagram_label;
931 u16 lf;
932
933 /* Update the ptask to point to the next fragment and send it */
934 lf = fwnet_get_hdr_lf(&ptask->hdr);
935 switch (lf) {
936 case RFC2374_HDR_LASTFRAG:
937 case RFC2374_HDR_UNFRAG:
938 default:
939 fw_error("Outstanding packet %x lf %x, header %x,%x\n",
940 ptask->outstanding_pkts, lf, ptask->hdr.w0,
941 ptask->hdr.w1);
942 BUG();
943
944 case RFC2374_HDR_FIRSTFRAG:
945 /* Set frag type here for future interior fragments */
946 dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
947 fg_off = ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
948 datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
949 break;
950
951 case RFC2374_HDR_INTFRAG:
952 dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
953 fg_off = fwnet_get_hdr_fg_off(&ptask->hdr)
954 + ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
955 datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
956 break;
957 }
958
959 skb_pull(skb, ptask->max_payload);
960 if (ptask->outstanding_pkts > 1) {
961 fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_INTFRAG,
962 dg_size, fg_off, datagram_label);
963 } else {
964 fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_LASTFRAG,
965 dg_size, fg_off, datagram_label);
966 ptask->max_payload = skb->len + RFC2374_FRAG_HDR_SIZE;
967 }
968 fwnet_send_packet(ptask);
969 }
970
971 if (free)
972 fwnet_free_ptask(ptask);
973 }
974
975 static void fwnet_transmit_packet_failed(struct fwnet_packet_task *ptask)
976 {
977 struct fwnet_device *dev = ptask->dev;
978 unsigned long flags;
979 bool free;
980
981 spin_lock_irqsave(&dev->lock, flags);
982
983 /* One fragment failed; don't try to send remaining fragments. */
984 ptask->outstanding_pkts = 0;
985
986 /* Check whether we or the networking TX soft-IRQ is last user. */
987 free = ptask->enqueued;
988 if (free)
989 dec_queued_datagrams(dev);
990
991 dev->netdev->stats.tx_dropped++;
992 dev->netdev->stats.tx_errors++;
993
994 spin_unlock_irqrestore(&dev->lock, flags);
995
996 if (free)
997 fwnet_free_ptask(ptask);
998 }
999
1000 static void fwnet_write_complete(struct fw_card *card, int rcode,
1001 void *payload, size_t length, void *data)
1002 {
1003 struct fwnet_packet_task *ptask = data;
1004 static unsigned long j;
1005 static int last_rcode, errors_skipped;
1006
1007 if (rcode == RCODE_COMPLETE) {
1008 fwnet_transmit_packet_done(ptask);
1009 } else {
1010 fwnet_transmit_packet_failed(ptask);
1011
1012 if (printk_timed_ratelimit(&j, 1000) || rcode != last_rcode) {
1013 fw_error("fwnet_write_complete: "
1014 "failed: %x (skipped %d)\n", rcode, errors_skipped);
1015
1016 errors_skipped = 0;
1017 last_rcode = rcode;
1018 } else
1019 errors_skipped++;
1020 }
1021 }
1022
1023 static int fwnet_send_packet(struct fwnet_packet_task *ptask)
1024 {
1025 struct fwnet_device *dev;
1026 unsigned tx_len;
1027 struct rfc2734_header *bufhdr;
1028 unsigned long flags;
1029 bool free;
1030
1031 dev = ptask->dev;
1032 tx_len = ptask->max_payload;
1033 switch (fwnet_get_hdr_lf(&ptask->hdr)) {
1034 case RFC2374_HDR_UNFRAG:
1035 bufhdr = (struct rfc2734_header *)
1036 skb_push(ptask->skb, RFC2374_UNFRAG_HDR_SIZE);
1037 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
1038 break;
1039
1040 case RFC2374_HDR_FIRSTFRAG:
1041 case RFC2374_HDR_INTFRAG:
1042 case RFC2374_HDR_LASTFRAG:
1043 bufhdr = (struct rfc2734_header *)
1044 skb_push(ptask->skb, RFC2374_FRAG_HDR_SIZE);
1045 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
1046 put_unaligned_be32(ptask->hdr.w1, &bufhdr->w1);
1047 break;
1048
1049 default:
1050 BUG();
1051 }
1052 if (ptask->dest_node == IEEE1394_ALL_NODES) {
1053 u8 *p;
1054 int generation;
1055 int node_id;
1056
1057 /* ptask->generation may not have been set yet */
1058 generation = dev->card->generation;
1059 smp_rmb();
1060 node_id = dev->card->node_id;
1061
1062 p = skb_push(ptask->skb, 8);
1063 put_unaligned_be32(node_id << 16 | IANA_SPECIFIER_ID >> 8, p);
1064 put_unaligned_be32((IANA_SPECIFIER_ID & 0xff) << 24
1065 | RFC2734_SW_VERSION, &p[4]);
1066
1067 /* We should not transmit if broadcast_channel.valid == 0. */
1068 fw_send_request(dev->card, &ptask->transaction,
1069 TCODE_STREAM_DATA,
1070 fw_stream_packet_destination_id(3,
1071 IEEE1394_BROADCAST_CHANNEL, 0),
1072 generation, SCODE_100, 0ULL, ptask->skb->data,
1073 tx_len + 8, fwnet_write_complete, ptask);
1074
1075 spin_lock_irqsave(&dev->lock, flags);
1076
1077 /* If the AT tasklet already ran, we may be last user. */
1078 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1079 if (!free)
1080 ptask->enqueued = true;
1081 else
1082 dec_queued_datagrams(dev);
1083
1084 spin_unlock_irqrestore(&dev->lock, flags);
1085
1086 goto out;
1087 }
1088
1089 fw_send_request(dev->card, &ptask->transaction,
1090 TCODE_WRITE_BLOCK_REQUEST, ptask->dest_node,
1091 ptask->generation, ptask->speed, ptask->fifo_addr,
1092 ptask->skb->data, tx_len, fwnet_write_complete, ptask);
1093
1094 spin_lock_irqsave(&dev->lock, flags);
1095
1096 /* If the AT tasklet already ran, we may be last user. */
1097 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1098 if (!free)
1099 ptask->enqueued = true;
1100 else
1101 dec_queued_datagrams(dev);
1102
1103 spin_unlock_irqrestore(&dev->lock, flags);
1104
1105 dev->netdev->trans_start = jiffies;
1106 out:
1107 if (free)
1108 fwnet_free_ptask(ptask);
1109
1110 return 0;
1111 }
1112
1113 static int fwnet_broadcast_start(struct fwnet_device *dev)
1114 {
1115 struct fw_iso_context *context;
1116 int retval;
1117 unsigned num_packets;
1118 unsigned max_receive;
1119 struct fw_iso_packet packet;
1120 unsigned long offset;
1121 unsigned u;
1122
1123 if (dev->local_fifo == FWNET_NO_FIFO_ADDR) {
1124 dev->handler.length = 4096;
1125 dev->handler.address_callback = fwnet_receive_packet;
1126 dev->handler.callback_data = dev;
1127
1128 retval = fw_core_add_address_handler(&dev->handler,
1129 &fw_high_memory_region);
1130 if (retval < 0)
1131 goto failed_initial;
1132
1133 dev->local_fifo = dev->handler.offset;
1134 }
1135
1136 max_receive = 1U << (dev->card->max_receive + 1);
1137 num_packets = (FWNET_ISO_PAGE_COUNT * PAGE_SIZE) / max_receive;
1138
1139 if (!dev->broadcast_rcv_context) {
1140 void **ptrptr;
1141
1142 context = fw_iso_context_create(dev->card,
1143 FW_ISO_CONTEXT_RECEIVE, IEEE1394_BROADCAST_CHANNEL,
1144 dev->card->link_speed, 8, fwnet_receive_broadcast, dev);
1145 if (IS_ERR(context)) {
1146 retval = PTR_ERR(context);
1147 goto failed_context_create;
1148 }
1149
1150 retval = fw_iso_buffer_init(&dev->broadcast_rcv_buffer,
1151 dev->card, FWNET_ISO_PAGE_COUNT, DMA_FROM_DEVICE);
1152 if (retval < 0)
1153 goto failed_buffer_init;
1154
1155 ptrptr = kmalloc(sizeof(void *) * num_packets, GFP_KERNEL);
1156 if (!ptrptr) {
1157 retval = -ENOMEM;
1158 goto failed_ptrs_alloc;
1159 }
1160
1161 dev->broadcast_rcv_buffer_ptrs = ptrptr;
1162 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++) {
1163 void *ptr;
1164 unsigned v;
1165
1166 ptr = kmap(dev->broadcast_rcv_buffer.pages[u]);
1167 for (v = 0; v < num_packets / FWNET_ISO_PAGE_COUNT; v++)
1168 *ptrptr++ = (void *)
1169 ((char *)ptr + v * max_receive);
1170 }
1171 dev->broadcast_rcv_context = context;
1172 } else {
1173 context = dev->broadcast_rcv_context;
1174 }
1175
1176 packet.payload_length = max_receive;
1177 packet.interrupt = 1;
1178 packet.skip = 0;
1179 packet.tag = 3;
1180 packet.sy = 0;
1181 packet.header_length = IEEE1394_GASP_HDR_SIZE;
1182 offset = 0;
1183
1184 for (u = 0; u < num_packets; u++) {
1185 retval = fw_iso_context_queue(context, &packet,
1186 &dev->broadcast_rcv_buffer, offset);
1187 if (retval < 0)
1188 goto failed_rcv_queue;
1189
1190 offset += max_receive;
1191 }
1192 dev->num_broadcast_rcv_ptrs = num_packets;
1193 dev->rcv_buffer_size = max_receive;
1194 dev->broadcast_rcv_next_ptr = 0U;
1195 retval = fw_iso_context_start(context, -1, 0,
1196 FW_ISO_CONTEXT_MATCH_ALL_TAGS); /* ??? sync */
1197 if (retval < 0)
1198 goto failed_rcv_queue;
1199
1200 /* FIXME: adjust it according to the min. speed of all known peers? */
1201 dev->broadcast_xmt_max_payload = IEEE1394_MAX_PAYLOAD_S100
1202 - IEEE1394_GASP_HDR_SIZE - RFC2374_UNFRAG_HDR_SIZE;
1203 dev->broadcast_state = FWNET_BROADCAST_RUNNING;
1204
1205 return 0;
1206
1207 failed_rcv_queue:
1208 kfree(dev->broadcast_rcv_buffer_ptrs);
1209 dev->broadcast_rcv_buffer_ptrs = NULL;
1210 failed_ptrs_alloc:
1211 fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer, dev->card);
1212 failed_buffer_init:
1213 fw_iso_context_destroy(context);
1214 dev->broadcast_rcv_context = NULL;
1215 failed_context_create:
1216 fw_core_remove_address_handler(&dev->handler);
1217 failed_initial:
1218 dev->local_fifo = FWNET_NO_FIFO_ADDR;
1219
1220 return retval;
1221 }
1222
1223 static void set_carrier_state(struct fwnet_device *dev)
1224 {
1225 if (dev->peer_count > 1)
1226 netif_carrier_on(dev->netdev);
1227 else
1228 netif_carrier_off(dev->netdev);
1229 }
1230
1231 /* ifup */
1232 static int fwnet_open(struct net_device *net)
1233 {
1234 struct fwnet_device *dev = netdev_priv(net);
1235 int ret;
1236
1237 if (dev->broadcast_state == FWNET_BROADCAST_ERROR) {
1238 ret = fwnet_broadcast_start(dev);
1239 if (ret)
1240 return ret;
1241 }
1242 netif_start_queue(net);
1243
1244 spin_lock_irq(&dev->lock);
1245 set_carrier_state(dev);
1246 spin_unlock_irq(&dev->lock);
1247
1248 return 0;
1249 }
1250
1251 /* ifdown */
1252 static int fwnet_stop(struct net_device *net)
1253 {
1254 netif_stop_queue(net);
1255
1256 /* Deallocate iso context for use by other applications? */
1257
1258 return 0;
1259 }
1260
1261 static netdev_tx_t fwnet_tx(struct sk_buff *skb, struct net_device *net)
1262 {
1263 struct fwnet_header hdr_buf;
1264 struct fwnet_device *dev = netdev_priv(net);
1265 __be16 proto;
1266 u16 dest_node;
1267 unsigned max_payload;
1268 u16 dg_size;
1269 u16 *datagram_label_ptr;
1270 struct fwnet_packet_task *ptask;
1271 struct fwnet_peer *peer;
1272 unsigned long flags;
1273
1274 spin_lock_irqsave(&dev->lock, flags);
1275
1276 /* Can this happen? */
1277 if (netif_queue_stopped(dev->netdev)) {
1278 spin_unlock_irqrestore(&dev->lock, flags);
1279
1280 return NETDEV_TX_BUSY;
1281 }
1282
1283 ptask = kmem_cache_alloc(fwnet_packet_task_cache, GFP_ATOMIC);
1284 if (ptask == NULL)
1285 goto fail;
1286
1287 skb = skb_share_check(skb, GFP_ATOMIC);
1288 if (!skb)
1289 goto fail;
1290
1291 /*
1292 * Make a copy of the driver-specific header.
1293 * We might need to rebuild the header on tx failure.
1294 */
1295 memcpy(&hdr_buf, skb->data, sizeof(hdr_buf));
1296 skb_pull(skb, sizeof(hdr_buf));
1297
1298 proto = hdr_buf.h_proto;
1299 dg_size = skb->len;
1300
1301 /*
1302 * Set the transmission type for the packet. ARP packets and IP
1303 * broadcast packets are sent via GASP.
1304 */
1305 if (memcmp(hdr_buf.h_dest, net->broadcast, FWNET_ALEN) == 0
1306 || proto == htons(ETH_P_ARP)
1307 || (proto == htons(ETH_P_IP)
1308 && IN_MULTICAST(ntohl(ip_hdr(skb)->daddr)))) {
1309 max_payload = dev->broadcast_xmt_max_payload;
1310 datagram_label_ptr = &dev->broadcast_xmt_datagramlabel;
1311
1312 ptask->fifo_addr = FWNET_NO_FIFO_ADDR;
1313 ptask->generation = 0;
1314 ptask->dest_node = IEEE1394_ALL_NODES;
1315 ptask->speed = SCODE_100;
1316 } else {
1317 __be64 guid = get_unaligned((__be64 *)hdr_buf.h_dest);
1318 u8 generation;
1319
1320 peer = fwnet_peer_find_by_guid(dev, be64_to_cpu(guid));
1321 if (!peer || peer->fifo == FWNET_NO_FIFO_ADDR)
1322 goto fail;
1323
1324 generation = peer->generation;
1325 dest_node = peer->node_id;
1326 max_payload = peer->max_payload;
1327 datagram_label_ptr = &peer->datagram_label;
1328
1329 ptask->fifo_addr = peer->fifo;
1330 ptask->generation = generation;
1331 ptask->dest_node = dest_node;
1332 ptask->speed = peer->speed;
1333 }
1334
1335 /* If this is an ARP packet, convert it */
1336 if (proto == htons(ETH_P_ARP)) {
1337 struct arphdr *arp = (struct arphdr *)skb->data;
1338 unsigned char *arp_ptr = (unsigned char *)(arp + 1);
1339 struct rfc2734_arp *arp1394 = (struct rfc2734_arp *)skb->data;
1340 __be32 ipaddr;
1341
1342 ipaddr = get_unaligned((__be32 *)(arp_ptr + FWNET_ALEN));
1343
1344 arp1394->hw_addr_len = RFC2734_HW_ADDR_LEN;
1345 arp1394->max_rec = dev->card->max_receive;
1346 arp1394->sspd = dev->card->link_speed;
1347
1348 put_unaligned_be16(dev->local_fifo >> 32,
1349 &arp1394->fifo_hi);
1350 put_unaligned_be32(dev->local_fifo & 0xffffffff,
1351 &arp1394->fifo_lo);
1352 put_unaligned(ipaddr, &arp1394->sip);
1353 }
1354
1355 ptask->hdr.w0 = 0;
1356 ptask->hdr.w1 = 0;
1357 ptask->skb = skb;
1358 ptask->dev = dev;
1359
1360 /* Does it all fit in one packet? */
1361 if (dg_size <= max_payload) {
1362 fwnet_make_uf_hdr(&ptask->hdr, ntohs(proto));
1363 ptask->outstanding_pkts = 1;
1364 max_payload = dg_size + RFC2374_UNFRAG_HDR_SIZE;
1365 } else {
1366 u16 datagram_label;
1367
1368 max_payload -= RFC2374_FRAG_OVERHEAD;
1369 datagram_label = (*datagram_label_ptr)++;
1370 fwnet_make_ff_hdr(&ptask->hdr, ntohs(proto), dg_size,
1371 datagram_label);
1372 ptask->outstanding_pkts = DIV_ROUND_UP(dg_size, max_payload);
1373 max_payload += RFC2374_FRAG_HDR_SIZE;
1374 }
1375
1376 if (++dev->queued_datagrams == FWNET_MAX_QUEUED_DATAGRAMS)
1377 netif_stop_queue(dev->netdev);
1378
1379 spin_unlock_irqrestore(&dev->lock, flags);
1380
1381 ptask->max_payload = max_payload;
1382 ptask->enqueued = 0;
1383
1384 fwnet_send_packet(ptask);
1385
1386 return NETDEV_TX_OK;
1387
1388 fail:
1389 spin_unlock_irqrestore(&dev->lock, flags);
1390
1391 if (ptask)
1392 kmem_cache_free(fwnet_packet_task_cache, ptask);
1393
1394 if (skb != NULL)
1395 dev_kfree_skb(skb);
1396
1397 net->stats.tx_dropped++;
1398 net->stats.tx_errors++;
1399
1400 /*
1401 * FIXME: According to a patch from 2003-02-26, "returning non-zero
1402 * causes serious problems" here, allegedly. Before that patch,
1403 * -ERRNO was returned which is not appropriate under Linux 2.6.
1404 * Perhaps more needs to be done? Stop the queue in serious
1405 * conditions and restart it elsewhere?
1406 */
1407 return NETDEV_TX_OK;
1408 }
1409
1410 static int fwnet_change_mtu(struct net_device *net, int new_mtu)
1411 {
1412 if (new_mtu < 68)
1413 return -EINVAL;
1414
1415 net->mtu = new_mtu;
1416 return 0;
1417 }
1418
1419 static const struct ethtool_ops fwnet_ethtool_ops = {
1420 .get_link = ethtool_op_get_link,
1421 };
1422
1423 static const struct net_device_ops fwnet_netdev_ops = {
1424 .ndo_open = fwnet_open,
1425 .ndo_stop = fwnet_stop,
1426 .ndo_start_xmit = fwnet_tx,
1427 .ndo_change_mtu = fwnet_change_mtu,
1428 };
1429
1430 static void fwnet_init_dev(struct net_device *net)
1431 {
1432 net->header_ops = &fwnet_header_ops;
1433 net->netdev_ops = &fwnet_netdev_ops;
1434 net->watchdog_timeo = 2 * HZ;
1435 net->flags = IFF_BROADCAST | IFF_MULTICAST;
1436 net->features = NETIF_F_HIGHDMA;
1437 net->addr_len = FWNET_ALEN;
1438 net->hard_header_len = FWNET_HLEN;
1439 net->type = ARPHRD_IEEE1394;
1440 net->tx_queue_len = FWNET_TX_QUEUE_LEN;
1441 net->ethtool_ops = &fwnet_ethtool_ops;
1442 }
1443
1444 /* caller must hold fwnet_device_mutex */
1445 static struct fwnet_device *fwnet_dev_find(struct fw_card *card)
1446 {
1447 struct fwnet_device *dev;
1448
1449 list_for_each_entry(dev, &fwnet_device_list, dev_link)
1450 if (dev->card == card)
1451 return dev;
1452
1453 return NULL;
1454 }
1455
1456 static int fwnet_add_peer(struct fwnet_device *dev,
1457 struct fw_unit *unit, struct fw_device *device)
1458 {
1459 struct fwnet_peer *peer;
1460
1461 peer = kmalloc(sizeof(*peer), GFP_KERNEL);
1462 if (!peer)
1463 return -ENOMEM;
1464
1465 dev_set_drvdata(&unit->device, peer);
1466
1467 peer->dev = dev;
1468 peer->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4];
1469 peer->fifo = FWNET_NO_FIFO_ADDR;
1470 peer->ip = 0;
1471 INIT_LIST_HEAD(&peer->pd_list);
1472 peer->pdg_size = 0;
1473 peer->datagram_label = 0;
1474 peer->speed = device->max_speed;
1475 peer->max_payload = fwnet_max_payload(device->max_rec, peer->speed);
1476
1477 peer->generation = device->generation;
1478 smp_rmb();
1479 peer->node_id = device->node_id;
1480
1481 spin_lock_irq(&dev->lock);
1482 list_add_tail(&peer->peer_link, &dev->peer_list);
1483 dev->peer_count++;
1484 set_carrier_state(dev);
1485 spin_unlock_irq(&dev->lock);
1486
1487 return 0;
1488 }
1489
1490 static int fwnet_probe(struct device *_dev)
1491 {
1492 struct fw_unit *unit = fw_unit(_dev);
1493 struct fw_device *device = fw_parent_device(unit);
1494 struct fw_card *card = device->card;
1495 struct net_device *net;
1496 bool allocated_netdev = false;
1497 struct fwnet_device *dev;
1498 unsigned max_mtu;
1499 int ret;
1500
1501 mutex_lock(&fwnet_device_mutex);
1502
1503 dev = fwnet_dev_find(card);
1504 if (dev) {
1505 net = dev->netdev;
1506 goto have_dev;
1507 }
1508
1509 net = alloc_netdev(sizeof(*dev), "firewire%d", fwnet_init_dev);
1510 if (net == NULL) {
1511 ret = -ENOMEM;
1512 goto out;
1513 }
1514
1515 allocated_netdev = true;
1516 SET_NETDEV_DEV(net, card->device);
1517 dev = netdev_priv(net);
1518
1519 spin_lock_init(&dev->lock);
1520 dev->broadcast_state = FWNET_BROADCAST_ERROR;
1521 dev->broadcast_rcv_context = NULL;
1522 dev->broadcast_xmt_max_payload = 0;
1523 dev->broadcast_xmt_datagramlabel = 0;
1524 dev->local_fifo = FWNET_NO_FIFO_ADDR;
1525 dev->queued_datagrams = 0;
1526 INIT_LIST_HEAD(&dev->peer_list);
1527 dev->card = card;
1528 dev->netdev = net;
1529
1530 /*
1531 * Use the RFC 2734 default 1500 octets or the maximum payload
1532 * as initial MTU
1533 */
1534 max_mtu = (1 << (card->max_receive + 1))
1535 - sizeof(struct rfc2734_header) - IEEE1394_GASP_HDR_SIZE;
1536 net->mtu = min(1500U, max_mtu);
1537
1538 /* Set our hardware address while we're at it */
1539 put_unaligned_be64(card->guid, net->dev_addr);
1540 put_unaligned_be64(~0ULL, net->broadcast);
1541 ret = register_netdev(net);
1542 if (ret) {
1543 fw_error("Cannot register the driver\n");
1544 goto out;
1545 }
1546
1547 list_add_tail(&dev->dev_link, &fwnet_device_list);
1548 fw_notify("%s: IPv4 over FireWire on device %016llx\n",
1549 net->name, (unsigned long long)card->guid);
1550 have_dev:
1551 ret = fwnet_add_peer(dev, unit, device);
1552 if (ret && allocated_netdev) {
1553 unregister_netdev(net);
1554 list_del(&dev->dev_link);
1555 }
1556 out:
1557 if (ret && allocated_netdev)
1558 free_netdev(net);
1559
1560 mutex_unlock(&fwnet_device_mutex);
1561
1562 return ret;
1563 }
1564
1565 static void fwnet_remove_peer(struct fwnet_peer *peer, struct fwnet_device *dev)
1566 {
1567 struct fwnet_partial_datagram *pd, *pd_next;
1568
1569 spin_lock_irq(&dev->lock);
1570 list_del(&peer->peer_link);
1571 dev->peer_count--;
1572 set_carrier_state(dev);
1573 spin_unlock_irq(&dev->lock);
1574
1575 list_for_each_entry_safe(pd, pd_next, &peer->pd_list, pd_link)
1576 fwnet_pd_delete(pd);
1577
1578 kfree(peer);
1579 }
1580
1581 static int fwnet_remove(struct device *_dev)
1582 {
1583 struct fwnet_peer *peer = dev_get_drvdata(_dev);
1584 struct fwnet_device *dev = peer->dev;
1585 struct net_device *net;
1586 int i;
1587
1588 mutex_lock(&fwnet_device_mutex);
1589
1590 net = dev->netdev;
1591 if (net && peer->ip)
1592 arp_invalidate(net, peer->ip);
1593
1594 fwnet_remove_peer(peer, dev);
1595
1596 if (list_empty(&dev->peer_list)) {
1597 unregister_netdev(net);
1598
1599 if (dev->local_fifo != FWNET_NO_FIFO_ADDR)
1600 fw_core_remove_address_handler(&dev->handler);
1601 if (dev->broadcast_rcv_context) {
1602 fw_iso_context_stop(dev->broadcast_rcv_context);
1603 fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer,
1604 dev->card);
1605 fw_iso_context_destroy(dev->broadcast_rcv_context);
1606 }
1607 for (i = 0; dev->queued_datagrams && i < 5; i++)
1608 ssleep(1);
1609 WARN_ON(dev->queued_datagrams);
1610 list_del(&dev->dev_link);
1611
1612 free_netdev(net);
1613 }
1614
1615 mutex_unlock(&fwnet_device_mutex);
1616
1617 return 0;
1618 }
1619
1620 /*
1621 * FIXME abort partially sent fragmented datagrams,
1622 * discard partially received fragmented datagrams
1623 */
1624 static void fwnet_update(struct fw_unit *unit)
1625 {
1626 struct fw_device *device = fw_parent_device(unit);
1627 struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1628 int generation;
1629
1630 generation = device->generation;
1631
1632 spin_lock_irq(&peer->dev->lock);
1633 peer->node_id = device->node_id;
1634 peer->generation = generation;
1635 spin_unlock_irq(&peer->dev->lock);
1636 }
1637
1638 static const struct ieee1394_device_id fwnet_id_table[] = {
1639 {
1640 .match_flags = IEEE1394_MATCH_SPECIFIER_ID |
1641 IEEE1394_MATCH_VERSION,
1642 .specifier_id = IANA_SPECIFIER_ID,
1643 .version = RFC2734_SW_VERSION,
1644 },
1645 { }
1646 };
1647
1648 static struct fw_driver fwnet_driver = {
1649 .driver = {
1650 .owner = THIS_MODULE,
1651 .name = "net",
1652 .bus = &fw_bus_type,
1653 .probe = fwnet_probe,
1654 .remove = fwnet_remove,
1655 },
1656 .update = fwnet_update,
1657 .id_table = fwnet_id_table,
1658 };
1659
1660 static const u32 rfc2374_unit_directory_data[] = {
1661 0x00040000, /* directory_length */
1662 0x1200005e, /* unit_specifier_id: IANA */
1663 0x81000003, /* textual descriptor offset */
1664 0x13000001, /* unit_sw_version: RFC 2734 */
1665 0x81000005, /* textual descriptor offset */
1666 0x00030000, /* descriptor_length */
1667 0x00000000, /* text */
1668 0x00000000, /* minimal ASCII, en */
1669 0x49414e41, /* I A N A */
1670 0x00030000, /* descriptor_length */
1671 0x00000000, /* text */
1672 0x00000000, /* minimal ASCII, en */
1673 0x49507634, /* I P v 4 */
1674 };
1675
1676 static struct fw_descriptor rfc2374_unit_directory = {
1677 .length = ARRAY_SIZE(rfc2374_unit_directory_data),
1678 .key = (CSR_DIRECTORY | CSR_UNIT) << 24,
1679 .data = rfc2374_unit_directory_data
1680 };
1681
1682 static int __init fwnet_init(void)
1683 {
1684 int err;
1685
1686 err = fw_core_add_descriptor(&rfc2374_unit_directory);
1687 if (err)
1688 return err;
1689
1690 fwnet_packet_task_cache = kmem_cache_create("packet_task",
1691 sizeof(struct fwnet_packet_task), 0, 0, NULL);
1692 if (!fwnet_packet_task_cache) {
1693 err = -ENOMEM;
1694 goto out;
1695 }
1696
1697 err = driver_register(&fwnet_driver.driver);
1698 if (!err)
1699 return 0;
1700
1701 kmem_cache_destroy(fwnet_packet_task_cache);
1702 out:
1703 fw_core_remove_descriptor(&rfc2374_unit_directory);
1704
1705 return err;
1706 }
1707 module_init(fwnet_init);
1708
1709 static void __exit fwnet_cleanup(void)
1710 {
1711 driver_unregister(&fwnet_driver.driver);
1712 kmem_cache_destroy(fwnet_packet_task_cache);
1713 fw_core_remove_descriptor(&rfc2374_unit_directory);
1714 }
1715 module_exit(fwnet_cleanup);
1716
1717 MODULE_AUTHOR("Jay Fenlason <fenlason@redhat.com>");
1718 MODULE_DESCRIPTION("IPv4 over IEEE1394 as per RFC 2734");
1719 MODULE_LICENSE("GPL");
1720 MODULE_DEVICE_TABLE(ieee1394, fwnet_id_table);