?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
/proc/pid/smaps: fix dirty pages accounting
[linux-2.6.git] / drivers / firewire / net.c
blob33f8421c71cc05001c57bbf275b61679fded72eb
1 /*
2 * IPv4 over IEEE 1394, per RFC 2734
3 *
4 * Copyright (C) 2009 Jay Fenlason <fenlason@redhat.com>
5 *
6 * based on eth1394 by Ben Collins et al
7 */
8
9 #include <linux/bug.h>
10 #include <linux/device.h>
11 #include <linux/ethtool.h>
12 #include <linux/firewire.h>
13 #include <linux/firewire-constants.h>
14 #include <linux/highmem.h>
15 #include <linux/in.h>
16 #include <linux/ip.h>
17 #include <linux/jiffies.h>
18 #include <linux/mod_devicetable.h>
19 #include <linux/module.h>
20 #include <linux/moduleparam.h>
21 #include <linux/mutex.h>
22 #include <linux/netdevice.h>
23 #include <linux/skbuff.h>
24 #include <linux/slab.h>
25 #include <linux/spinlock.h>
26
27 #include <asm/unaligned.h>
28 #include <net/arp.h>
29
30 #define FWNET_MAX_FRAGMENTS 25 /* arbitrary limit */
31 #define FWNET_ISO_PAGE_COUNT (PAGE_SIZE < 16 * 1024 ? 4 : 2)
32
33 #define IEEE1394_BROADCAST_CHANNEL 31
34 #define IEEE1394_ALL_NODES (0xffc0 | 0x003f)
35 #define IEEE1394_MAX_PAYLOAD_S100 512
36 #define FWNET_NO_FIFO_ADDR (~0ULL)
37
38 #define IANA_SPECIFIER_ID 0x00005eU
39 #define RFC2734_SW_VERSION 0x000001U
40
41 #define IEEE1394_GASP_HDR_SIZE 8
42
43 #define RFC2374_UNFRAG_HDR_SIZE 4
44 #define RFC2374_FRAG_HDR_SIZE 8
45 #define RFC2374_FRAG_OVERHEAD 4
46
47 #define RFC2374_HDR_UNFRAG 0 /* unfragmented */
48 #define RFC2374_HDR_FIRSTFRAG 1 /* first fragment */
49 #define RFC2374_HDR_LASTFRAG 2 /* last fragment */
50 #define RFC2374_HDR_INTFRAG 3 /* interior fragment */
51
52 #define RFC2734_HW_ADDR_LEN 16
53
54 struct rfc2734_arp {
55 __be16 hw_type; /* 0x0018 */
56 __be16 proto_type; /* 0x0806 */
57 u8 hw_addr_len; /* 16 */
58 u8 ip_addr_len; /* 4 */
59 __be16 opcode; /* ARP Opcode */
60 /* Above is exactly the same format as struct arphdr */
61
62 __be64 s_uniq_id; /* Sender's 64bit EUI */
63 u8 max_rec; /* Sender's max packet size */
64 u8 sspd; /* Sender's max speed */
65 __be16 fifo_hi; /* hi 16bits of sender's FIFO addr */
66 __be32 fifo_lo; /* lo 32bits of sender's FIFO addr */
67 __be32 sip; /* Sender's IP Address */
68 __be32 tip; /* IP Address of requested hw addr */
69 } __attribute__((packed));
70
71 /* This header format is specific to this driver implementation. */
72 #define FWNET_ALEN 8
73 #define FWNET_HLEN 10
74 struct fwnet_header {
75 u8 h_dest[FWNET_ALEN]; /* destination address */
76 __be16 h_proto; /* packet type ID field */
77 } __attribute__((packed));
78
79 /* IPv4 and IPv6 encapsulation header */
80 struct rfc2734_header {
81 u32 w0;
82 u32 w1;
83 };
84
85 #define fwnet_get_hdr_lf(h) (((h)->w0 & 0xc0000000) >> 30)
86 #define fwnet_get_hdr_ether_type(h) (((h)->w0 & 0x0000ffff))
87 #define fwnet_get_hdr_dg_size(h) (((h)->w0 & 0x0fff0000) >> 16)
88 #define fwnet_get_hdr_fg_off(h) (((h)->w0 & 0x00000fff))
89 #define fwnet_get_hdr_dgl(h) (((h)->w1 & 0xffff0000) >> 16)
90
91 #define fwnet_set_hdr_lf(lf) ((lf) << 30)
92 #define fwnet_set_hdr_ether_type(et) (et)
93 #define fwnet_set_hdr_dg_size(dgs) ((dgs) << 16)
94 #define fwnet_set_hdr_fg_off(fgo) (fgo)
95
96 #define fwnet_set_hdr_dgl(dgl) ((dgl) << 16)
97
98 static inline void fwnet_make_uf_hdr(struct rfc2734_header *hdr,
99 unsigned ether_type)
100 {
101 hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_UNFRAG)
102 | fwnet_set_hdr_ether_type(ether_type);
103 }
104
105 static inline void fwnet_make_ff_hdr(struct rfc2734_header *hdr,
106 unsigned ether_type, unsigned dg_size, unsigned dgl)
107 {
108 hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_FIRSTFRAG)
109 | fwnet_set_hdr_dg_size(dg_size)
110 | fwnet_set_hdr_ether_type(ether_type);
111 hdr->w1 = fwnet_set_hdr_dgl(dgl);
112 }
113
114 static inline void fwnet_make_sf_hdr(struct rfc2734_header *hdr,
115 unsigned lf, unsigned dg_size, unsigned fg_off, unsigned dgl)
116 {
117 hdr->w0 = fwnet_set_hdr_lf(lf)
118 | fwnet_set_hdr_dg_size(dg_size)
119 | fwnet_set_hdr_fg_off(fg_off);
120 hdr->w1 = fwnet_set_hdr_dgl(dgl);
121 }
122
123 /* This list keeps track of what parts of the datagram have been filled in */
124 struct fwnet_fragment_info {
125 struct list_head fi_link;
126 u16 offset;
127 u16 len;
128 };
129
130 struct fwnet_partial_datagram {
131 struct list_head pd_link;
132 struct list_head fi_list;
133 struct sk_buff *skb;
134 /* FIXME Why not use skb->data? */
135 char *pbuf;
136 u16 datagram_label;
137 u16 ether_type;
138 u16 datagram_size;
139 };
140
141 static DEFINE_MUTEX(fwnet_device_mutex);
142 static LIST_HEAD(fwnet_device_list);
143
144 struct fwnet_device {
145 struct list_head dev_link;
146 spinlock_t lock;
147 enum {
148 FWNET_BROADCAST_ERROR,
149 FWNET_BROADCAST_RUNNING,
150 FWNET_BROADCAST_STOPPED,
151 } broadcast_state;
152 struct fw_iso_context *broadcast_rcv_context;
153 struct fw_iso_buffer broadcast_rcv_buffer;
154 void **broadcast_rcv_buffer_ptrs;
155 unsigned broadcast_rcv_next_ptr;
156 unsigned num_broadcast_rcv_ptrs;
157 unsigned rcv_buffer_size;
158 /*
159 * This value is the maximum unfragmented datagram size that can be
160 * sent by the hardware. It already has the GASP overhead and the
161 * unfragmented datagram header overhead calculated into it.
162 */
163 unsigned broadcast_xmt_max_payload;
164 u16 broadcast_xmt_datagramlabel;
165
166 /*
167 * The CSR address that remote nodes must send datagrams to for us to
168 * receive them.
169 */
170 struct fw_address_handler handler;
171 u64 local_fifo;
172
173 /* List of packets to be sent */
174 struct list_head packet_list;
175 /*
176 * List of packets that were broadcasted. When we get an ISO interrupt
177 * one of them has been sent
178 */
179 struct list_head broadcasted_list;
180 /* List of packets that have been sent but not yet acked */
181 struct list_head sent_list;
182
183 struct list_head peer_list;
184 struct fw_card *card;
185 struct net_device *netdev;
186 };
187
188 struct fwnet_peer {
189 struct list_head peer_link;
190 struct fwnet_device *dev;
191 u64 guid;
192 u64 fifo;
193
194 /* guarded by dev->lock */
195 struct list_head pd_list; /* received partial datagrams */
196 unsigned pdg_size; /* pd_list size */
197
198 u16 datagram_label; /* outgoing datagram label */
199 unsigned max_payload; /* includes RFC2374_FRAG_HDR_SIZE overhead */
200 int node_id;
201 int generation;
202 unsigned speed;
203 };
204
205 /* This is our task struct. It's used for the packet complete callback. */
206 struct fwnet_packet_task {
207 /*
208 * ptask can actually be on dev->packet_list, dev->broadcasted_list,
209 * or dev->sent_list depending on its current state.
210 */
211 struct list_head pt_link;
212 struct fw_transaction transaction;
213 struct rfc2734_header hdr;
214 struct sk_buff *skb;
215 struct fwnet_device *dev;
216
217 int outstanding_pkts;
218 unsigned max_payload;
219 u64 fifo_addr;
220 u16 dest_node;
221 u8 generation;
222 u8 speed;
223 };
224
225 /*
226 * saddr == NULL means use device source address.
227 * daddr == NULL means leave destination address (eg unresolved arp).
228 */
229 static int fwnet_header_create(struct sk_buff *skb, struct net_device *net,
230 unsigned short type, const void *daddr,
231 const void *saddr, unsigned len)
232 {
233 struct fwnet_header *h;
234
235 h = (struct fwnet_header *)skb_push(skb, sizeof(*h));
236 put_unaligned_be16(type, &h->h_proto);
237
238 if (net->flags & (IFF_LOOPBACK | IFF_NOARP)) {
239 memset(h->h_dest, 0, net->addr_len);
240
241 return net->hard_header_len;
242 }
243
244 if (daddr) {
245 memcpy(h->h_dest, daddr, net->addr_len);
246
247 return net->hard_header_len;
248 }
249
250 return -net->hard_header_len;
251 }
252
253 static int fwnet_header_rebuild(struct sk_buff *skb)
254 {
255 struct fwnet_header *h = (struct fwnet_header *)skb->data;
256
257 if (get_unaligned_be16(&h->h_proto) == ETH_P_IP)
258 return arp_find((unsigned char *)&h->h_dest, skb);
259
260 fw_notify("%s: unable to resolve type %04x addresses\n",
261 skb->dev->name, be16_to_cpu(h->h_proto));
262 return 0;
263 }
264
265 static int fwnet_header_cache(const struct neighbour *neigh,
266 struct hh_cache *hh)
267 {
268 struct net_device *net;
269 struct fwnet_header *h;
270
271 if (hh->hh_type == cpu_to_be16(ETH_P_802_3))
272 return -1;
273 net = neigh->dev;
274 h = (struct fwnet_header *)((u8 *)hh->hh_data + 16 - sizeof(*h));
275 h->h_proto = hh->hh_type;
276 memcpy(h->h_dest, neigh->ha, net->addr_len);
277 hh->hh_len = FWNET_HLEN;
278
279 return 0;
280 }
281
282 /* Called by Address Resolution module to notify changes in address. */
283 static void fwnet_header_cache_update(struct hh_cache *hh,
284 const struct net_device *net, const unsigned char *haddr)
285 {
286 memcpy((u8 *)hh->hh_data + 16 - FWNET_HLEN, haddr, net->addr_len);
287 }
288
289 static int fwnet_header_parse(const struct sk_buff *skb, unsigned char *haddr)
290 {
291 memcpy(haddr, skb->dev->dev_addr, FWNET_ALEN);
292
293 return FWNET_ALEN;
294 }
295
296 static const struct header_ops fwnet_header_ops = {
297 .create = fwnet_header_create,
298 .rebuild = fwnet_header_rebuild,
299 .cache = fwnet_header_cache,
300 .cache_update = fwnet_header_cache_update,
301 .parse = fwnet_header_parse,
302 };
303
304 /* FIXME: is this correct for all cases? */
305 static bool fwnet_frag_overlap(struct fwnet_partial_datagram *pd,
306 unsigned offset, unsigned len)
307 {
308 struct fwnet_fragment_info *fi;
309 unsigned end = offset + len;
310
311 list_for_each_entry(fi, &pd->fi_list, fi_link)
312 if (offset < fi->offset + fi->len && end > fi->offset)
313 return true;
314
315 return false;
316 }
317
318 /* Assumes that new fragment does not overlap any existing fragments */
319 static struct fwnet_fragment_info *fwnet_frag_new(
320 struct fwnet_partial_datagram *pd, unsigned offset, unsigned len)
321 {
322 struct fwnet_fragment_info *fi, *fi2, *new;
323 struct list_head *list;
324
325 list = &pd->fi_list;
326 list_for_each_entry(fi, &pd->fi_list, fi_link) {
327 if (fi->offset + fi->len == offset) {
328 /* The new fragment can be tacked on to the end */
329 /* Did the new fragment plug a hole? */
330 fi2 = list_entry(fi->fi_link.next,
331 struct fwnet_fragment_info, fi_link);
332 if (fi->offset + fi->len == fi2->offset) {
333 /* glue fragments together */
334 fi->len += len + fi2->len;
335 list_del(&fi2->fi_link);
336 kfree(fi2);
337 } else {
338 fi->len += len;
339 }
340
341 return fi;
342 }
343 if (offset + len == fi->offset) {
344 /* The new fragment can be tacked on to the beginning */
345 /* Did the new fragment plug a hole? */
346 fi2 = list_entry(fi->fi_link.prev,
347 struct fwnet_fragment_info, fi_link);
348 if (fi2->offset + fi2->len == fi->offset) {
349 /* glue fragments together */
350 fi2->len += fi->len + len;
351 list_del(&fi->fi_link);
352 kfree(fi);
353
354 return fi2;
355 }
356 fi->offset = offset;
357 fi->len += len;
358
359 return fi;
360 }
361 if (offset > fi->offset + fi->len) {
362 list = &fi->fi_link;
363 break;
364 }
365 if (offset + len < fi->offset) {
366 list = fi->fi_link.prev;
367 break;
368 }
369 }
370
371 new = kmalloc(sizeof(*new), GFP_ATOMIC);
372 if (!new) {
373 fw_error("out of memory\n");
374 return NULL;
375 }
376
377 new->offset = offset;
378 new->len = len;
379 list_add(&new->fi_link, list);
380
381 return new;
382 }
383
384 static struct fwnet_partial_datagram *fwnet_pd_new(struct net_device *net,
385 struct fwnet_peer *peer, u16 datagram_label, unsigned dg_size,
386 void *frag_buf, unsigned frag_off, unsigned frag_len)
387 {
388 struct fwnet_partial_datagram *new;
389 struct fwnet_fragment_info *fi;
390
391 new = kmalloc(sizeof(*new), GFP_ATOMIC);
392 if (!new)
393 goto fail;
394
395 INIT_LIST_HEAD(&new->fi_list);
396 fi = fwnet_frag_new(new, frag_off, frag_len);
397 if (fi == NULL)
398 goto fail_w_new;
399
400 new->datagram_label = datagram_label;
401 new->datagram_size = dg_size;
402 new->skb = dev_alloc_skb(dg_size + net->hard_header_len + 15);
403 if (new->skb == NULL)
404 goto fail_w_fi;
405
406 skb_reserve(new->skb, (net->hard_header_len + 15) & ~15);
407 new->pbuf = skb_put(new->skb, dg_size);
408 memcpy(new->pbuf + frag_off, frag_buf, frag_len);
409 list_add_tail(&new->pd_link, &peer->pd_list);
410
411 return new;
412
413 fail_w_fi:
414 kfree(fi);
415 fail_w_new:
416 kfree(new);
417 fail:
418 fw_error("out of memory\n");
419
420 return NULL;
421 }
422
423 static struct fwnet_partial_datagram *fwnet_pd_find(struct fwnet_peer *peer,
424 u16 datagram_label)
425 {
426 struct fwnet_partial_datagram *pd;
427
428 list_for_each_entry(pd, &peer->pd_list, pd_link)
429 if (pd->datagram_label == datagram_label)
430 return pd;
431
432 return NULL;
433 }
434
435
436 static void fwnet_pd_delete(struct fwnet_partial_datagram *old)
437 {
438 struct fwnet_fragment_info *fi, *n;
439
440 list_for_each_entry_safe(fi, n, &old->fi_list, fi_link)
441 kfree(fi);
442
443 list_del(&old->pd_link);
444 dev_kfree_skb_any(old->skb);
445 kfree(old);
446 }
447
448 static bool fwnet_pd_update(struct fwnet_peer *peer,
449 struct fwnet_partial_datagram *pd, void *frag_buf,
450 unsigned frag_off, unsigned frag_len)
451 {
452 if (fwnet_frag_new(pd, frag_off, frag_len) == NULL)
453 return false;
454
455 memcpy(pd->pbuf + frag_off, frag_buf, frag_len);
456
457 /*
458 * Move list entry to beginnig of list so that oldest partial
459 * datagrams percolate to the end of the list
460 */
461 list_move_tail(&pd->pd_link, &peer->pd_list);
462
463 return true;
464 }
465
466 static bool fwnet_pd_is_complete(struct fwnet_partial_datagram *pd)
467 {
468 struct fwnet_fragment_info *fi;
469
470 fi = list_entry(pd->fi_list.next, struct fwnet_fragment_info, fi_link);
471
472 return fi->len == pd->datagram_size;
473 }
474
475 /* caller must hold dev->lock */
476 static struct fwnet_peer *fwnet_peer_find_by_guid(struct fwnet_device *dev,
477 u64 guid)
478 {
479 struct fwnet_peer *peer;
480
481 list_for_each_entry(peer, &dev->peer_list, peer_link)
482 if (peer->guid == guid)
483 return peer;
484
485 return NULL;
486 }
487
488 /* caller must hold dev->lock */
489 static struct fwnet_peer *fwnet_peer_find_by_node_id(struct fwnet_device *dev,
490 int node_id, int generation)
491 {
492 struct fwnet_peer *peer;
493
494 list_for_each_entry(peer, &dev->peer_list, peer_link)
495 if (peer->node_id == node_id &&
496 peer->generation == generation)
497 return peer;
498
499 return NULL;
500 }
501
502 /* See IEEE 1394-2008 table 6-4, table 8-8, table 16-18. */
503 static unsigned fwnet_max_payload(unsigned max_rec, unsigned speed)
504 {
505 max_rec = min(max_rec, speed + 8);
506 max_rec = min(max_rec, 0xbU); /* <= 4096 */
507 if (max_rec < 8) {
508 fw_notify("max_rec %x out of range\n", max_rec);
509 max_rec = 8;
510 }
511
512 return (1 << (max_rec + 1)) - RFC2374_FRAG_HDR_SIZE;
513 }
514
515
516 static int fwnet_finish_incoming_packet(struct net_device *net,
517 struct sk_buff *skb, u16 source_node_id,
518 bool is_broadcast, u16 ether_type)
519 {
520 struct fwnet_device *dev;
521 static const __be64 broadcast_hw = cpu_to_be64(~0ULL);
522 int status;
523 __be64 guid;
524
525 dev = netdev_priv(net);
526 /* Write metadata, and then pass to the receive level */
527 skb->dev = net;
528 skb->ip_summed = CHECKSUM_UNNECESSARY; /* don't check it */
529
530 /*
531 * Parse the encapsulation header. This actually does the job of
532 * converting to an ethernet frame header, as well as arp
533 * conversion if needed. ARP conversion is easier in this
534 * direction, since we are using ethernet as our backend.
535 */
536 /*
537 * If this is an ARP packet, convert it. First, we want to make
538 * use of some of the fields, since they tell us a little bit
539 * about the sending machine.
540 */
541 if (ether_type == ETH_P_ARP) {
542 struct rfc2734_arp *arp1394;
543 struct arphdr *arp;
544 unsigned char *arp_ptr;
545 u64 fifo_addr;
546 u64 peer_guid;
547 unsigned sspd;
548 u16 max_payload;
549 struct fwnet_peer *peer;
550 unsigned long flags;
551
552 arp1394 = (struct rfc2734_arp *)skb->data;
553 arp = (struct arphdr *)skb->data;
554 arp_ptr = (unsigned char *)(arp + 1);
555 peer_guid = get_unaligned_be64(&arp1394->s_uniq_id);
556 fifo_addr = (u64)get_unaligned_be16(&arp1394->fifo_hi) << 32
557 | get_unaligned_be32(&arp1394->fifo_lo);
558
559 sspd = arp1394->sspd;
560 /* Sanity check. OS X 10.3 PPC reportedly sends 131. */
561 if (sspd > SCODE_3200) {
562 fw_notify("sspd %x out of range\n", sspd);
563 sspd = SCODE_3200;
564 }
565 max_payload = fwnet_max_payload(arp1394->max_rec, sspd);
566
567 spin_lock_irqsave(&dev->lock, flags);
568 peer = fwnet_peer_find_by_guid(dev, peer_guid);
569 if (peer) {
570 peer->fifo = fifo_addr;
571
572 if (peer->speed > sspd)
573 peer->speed = sspd;
574 if (peer->max_payload > max_payload)
575 peer->max_payload = max_payload;
576 }
577 spin_unlock_irqrestore(&dev->lock, flags);
578
579 if (!peer) {
580 fw_notify("No peer for ARP packet from %016llx\n",
581 (unsigned long long)peer_guid);
582 goto no_peer;
583 }
584
585 /*
586 * Now that we're done with the 1394 specific stuff, we'll
587 * need to alter some of the data. Believe it or not, all
588 * that needs to be done is sender_IP_address needs to be
589 * moved, the destination hardware address get stuffed
590 * in and the hardware address length set to 8.
591 *
592 * IMPORTANT: The code below overwrites 1394 specific data
593 * needed above so keep the munging of the data for the
594 * higher level IP stack last.
595 */
596
597 arp->ar_hln = 8;
598 /* skip over sender unique id */
599 arp_ptr += arp->ar_hln;
600 /* move sender IP addr */
601 put_unaligned(arp1394->sip, (u32 *)arp_ptr);
602 /* skip over sender IP addr */
603 arp_ptr += arp->ar_pln;
604
605 if (arp->ar_op == htons(ARPOP_REQUEST))
606 memset(arp_ptr, 0, sizeof(u64));
607 else
608 memcpy(arp_ptr, net->dev_addr, sizeof(u64));
609 }
610
611 /* Now add the ethernet header. */
612 guid = cpu_to_be64(dev->card->guid);
613 if (dev_hard_header(skb, net, ether_type,
614 is_broadcast ? &broadcast_hw : &guid,
615 NULL, skb->len) >= 0) {
616 struct fwnet_header *eth;
617 u16 *rawp;
618 __be16 protocol;
619
620 skb_reset_mac_header(skb);
621 skb_pull(skb, sizeof(*eth));
622 eth = (struct fwnet_header *)skb_mac_header(skb);
623 if (*eth->h_dest & 1) {
624 if (memcmp(eth->h_dest, net->broadcast,
625 net->addr_len) == 0)
626 skb->pkt_type = PACKET_BROADCAST;
627 #if 0
628 else
629 skb->pkt_type = PACKET_MULTICAST;
630 #endif
631 } else {
632 if (memcmp(eth->h_dest, net->dev_addr, net->addr_len))
633 skb->pkt_type = PACKET_OTHERHOST;
634 }
635 if (ntohs(eth->h_proto) >= 1536) {
636 protocol = eth->h_proto;
637 } else {
638 rawp = (u16 *)skb->data;
639 if (*rawp == 0xffff)
640 protocol = htons(ETH_P_802_3);
641 else
642 protocol = htons(ETH_P_802_2);
643 }
644 skb->protocol = protocol;
645 }
646 status = netif_rx(skb);
647 if (status == NET_RX_DROP) {
648 net->stats.rx_errors++;
649 net->stats.rx_dropped++;
650 } else {
651 net->stats.rx_packets++;
652 net->stats.rx_bytes += skb->len;
653 }
654 if (netif_queue_stopped(net))
655 netif_wake_queue(net);
656
657 return 0;
658
659 no_peer:
660 net->stats.rx_errors++;
661 net->stats.rx_dropped++;
662
663 dev_kfree_skb_any(skb);
664 if (netif_queue_stopped(net))
665 netif_wake_queue(net);
666
667 return -ENOENT;
668 }
669
670 static int fwnet_incoming_packet(struct fwnet_device *dev, __be32 *buf, int len,
671 int source_node_id, int generation,
672 bool is_broadcast)
673 {
674 struct sk_buff *skb;
675 struct net_device *net = dev->netdev;
676 struct rfc2734_header hdr;
677 unsigned lf;
678 unsigned long flags;
679 struct fwnet_peer *peer;
680 struct fwnet_partial_datagram *pd;
681 int fg_off;
682 int dg_size;
683 u16 datagram_label;
684 int retval;
685 u16 ether_type;
686
687 hdr.w0 = be32_to_cpu(buf[0]);
688 lf = fwnet_get_hdr_lf(&hdr);
689 if (lf == RFC2374_HDR_UNFRAG) {
690 /*
691 * An unfragmented datagram has been received by the ieee1394
692 * bus. Build an skbuff around it so we can pass it to the
693 * high level network layer.
694 */
695 ether_type = fwnet_get_hdr_ether_type(&hdr);
696 buf++;
697 len -= RFC2374_UNFRAG_HDR_SIZE;
698
699 skb = dev_alloc_skb(len + net->hard_header_len + 15);
700 if (unlikely(!skb)) {
701 fw_error("out of memory\n");
702 net->stats.rx_dropped++;
703
704 return -ENOMEM;
705 }
706 skb_reserve(skb, (net->hard_header_len + 15) & ~15);
707 memcpy(skb_put(skb, len), buf, len);
708
709 return fwnet_finish_incoming_packet(net, skb, source_node_id,
710 is_broadcast, ether_type);
711 }
712 /* A datagram fragment has been received, now the fun begins. */
713 hdr.w1 = ntohl(buf[1]);
714 buf += 2;
715 len -= RFC2374_FRAG_HDR_SIZE;
716 if (lf == RFC2374_HDR_FIRSTFRAG) {
717 ether_type = fwnet_get_hdr_ether_type(&hdr);
718 fg_off = 0;
719 } else {
720 ether_type = 0;
721 fg_off = fwnet_get_hdr_fg_off(&hdr);
722 }
723 datagram_label = fwnet_get_hdr_dgl(&hdr);
724 dg_size = fwnet_get_hdr_dg_size(&hdr); /* ??? + 1 */
725
726 spin_lock_irqsave(&dev->lock, flags);
727
728 peer = fwnet_peer_find_by_node_id(dev, source_node_id, generation);
729 if (!peer) {
730 retval = -ENOENT;
731 goto fail;
732 }
733
734 pd = fwnet_pd_find(peer, datagram_label);
735 if (pd == NULL) {
736 while (peer->pdg_size >= FWNET_MAX_FRAGMENTS) {
737 /* remove the oldest */
738 fwnet_pd_delete(list_first_entry(&peer->pd_list,
739 struct fwnet_partial_datagram, pd_link));
740 peer->pdg_size--;
741 }
742 pd = fwnet_pd_new(net, peer, datagram_label,
743 dg_size, buf, fg_off, len);
744 if (pd == NULL) {
745 retval = -ENOMEM;
746 goto fail;
747 }
748 peer->pdg_size++;
749 } else {
750 if (fwnet_frag_overlap(pd, fg_off, len) ||
751 pd->datagram_size != dg_size) {
752 /*
753 * Differing datagram sizes or overlapping fragments,
754 * discard old datagram and start a new one.
755 */
756 fwnet_pd_delete(pd);
757 pd = fwnet_pd_new(net, peer, datagram_label,
758 dg_size, buf, fg_off, len);
759 if (pd == NULL) {
760 peer->pdg_size--;
761 retval = -ENOMEM;
762 goto fail;
763 }
764 } else {
765 if (!fwnet_pd_update(peer, pd, buf, fg_off, len)) {
766 /*
767 * Couldn't save off fragment anyway
768 * so might as well obliterate the
769 * datagram now.
770 */
771 fwnet_pd_delete(pd);
772 peer->pdg_size--;
773 retval = -ENOMEM;
774 goto fail;
775 }
776 }
777 } /* new datagram or add to existing one */
778
779 if (lf == RFC2374_HDR_FIRSTFRAG)
780 pd->ether_type = ether_type;
781
782 if (fwnet_pd_is_complete(pd)) {
783 ether_type = pd->ether_type;
784 peer->pdg_size--;
785 skb = skb_get(pd->skb);
786 fwnet_pd_delete(pd);
787
788 spin_unlock_irqrestore(&dev->lock, flags);
789
790 return fwnet_finish_incoming_packet(net, skb, source_node_id,
791 false, ether_type);
792 }
793 /*
794 * Datagram is not complete, we're done for the
795 * moment.
796 */
797 spin_unlock_irqrestore(&dev->lock, flags);
798
799 return 0;
800 fail:
801 spin_unlock_irqrestore(&dev->lock, flags);
802
803 if (netif_queue_stopped(net))
804 netif_wake_queue(net);
805
806 return retval;
807 }
808
809 static void fwnet_receive_packet(struct fw_card *card, struct fw_request *r,
810 int tcode, int destination, int source, int generation,
811 unsigned long long offset, void *payload, size_t length,
812 void *callback_data)
813 {
814 struct fwnet_device *dev = callback_data;
815 int rcode;
816
817 if (destination == IEEE1394_ALL_NODES) {
818 kfree(r);
819
820 return;
821 }
822
823 if (offset != dev->handler.offset)
824 rcode = RCODE_ADDRESS_ERROR;
825 else if (tcode != TCODE_WRITE_BLOCK_REQUEST)
826 rcode = RCODE_TYPE_ERROR;
827 else if (fwnet_incoming_packet(dev, payload, length,
828 source, generation, false) != 0) {
829 fw_error("Incoming packet failure\n");
830 rcode = RCODE_CONFLICT_ERROR;
831 } else
832 rcode = RCODE_COMPLETE;
833
834 fw_send_response(card, r, rcode);
835 }
836
837 static void fwnet_receive_broadcast(struct fw_iso_context *context,
838 u32 cycle, size_t header_length, void *header, void *data)
839 {
840 struct fwnet_device *dev;
841 struct fw_iso_packet packet;
842 struct fw_card *card;
843 __be16 *hdr_ptr;
844 __be32 *buf_ptr;
845 int retval;
846 u32 length;
847 u16 source_node_id;
848 u32 specifier_id;
849 u32 ver;
850 unsigned long offset;
851 unsigned long flags;
852
853 dev = data;
854 card = dev->card;
855 hdr_ptr = header;
856 length = be16_to_cpup(hdr_ptr);
857
858 spin_lock_irqsave(&dev->lock, flags);
859
860 offset = dev->rcv_buffer_size * dev->broadcast_rcv_next_ptr;
861 buf_ptr = dev->broadcast_rcv_buffer_ptrs[dev->broadcast_rcv_next_ptr++];
862 if (dev->broadcast_rcv_next_ptr == dev->num_broadcast_rcv_ptrs)
863 dev->broadcast_rcv_next_ptr = 0;
864
865 spin_unlock_irqrestore(&dev->lock, flags);
866
867 specifier_id = (be32_to_cpu(buf_ptr[0]) & 0xffff) << 8
868 | (be32_to_cpu(buf_ptr[1]) & 0xff000000) >> 24;
869 ver = be32_to_cpu(buf_ptr[1]) & 0xffffff;
870 source_node_id = be32_to_cpu(buf_ptr[0]) >> 16;
871
872 if (specifier_id == IANA_SPECIFIER_ID && ver == RFC2734_SW_VERSION) {
873 buf_ptr += 2;
874 length -= IEEE1394_GASP_HDR_SIZE;
875 fwnet_incoming_packet(dev, buf_ptr, length,
876 source_node_id, -1, true);
877 }
878
879 packet.payload_length = dev->rcv_buffer_size;
880 packet.interrupt = 1;
881 packet.skip = 0;
882 packet.tag = 3;
883 packet.sy = 0;
884 packet.header_length = IEEE1394_GASP_HDR_SIZE;
885
886 spin_lock_irqsave(&dev->lock, flags);
887
888 retval = fw_iso_context_queue(dev->broadcast_rcv_context, &packet,
889 &dev->broadcast_rcv_buffer, offset);
890
891 spin_unlock_irqrestore(&dev->lock, flags);
892
893 if (retval < 0)
894 fw_error("requeue failed\n");
895 }
896
897 static struct kmem_cache *fwnet_packet_task_cache;
898
899 static void fwnet_free_ptask(struct fwnet_packet_task *ptask)
900 {
901 dev_kfree_skb_any(ptask->skb);
902 kmem_cache_free(fwnet_packet_task_cache, ptask);
903 }
904
905 static int fwnet_send_packet(struct fwnet_packet_task *ptask);
906
907 static void fwnet_transmit_packet_done(struct fwnet_packet_task *ptask)
908 {
909 struct fwnet_device *dev = ptask->dev;
910 unsigned long flags;
911 bool free;
912
913 spin_lock_irqsave(&dev->lock, flags);
914
915 ptask->outstanding_pkts--;
916
917 /* Check whether we or the networking TX soft-IRQ is last user. */
918 free = (ptask->outstanding_pkts == 0 && !list_empty(&ptask->pt_link));
919
920 if (ptask->outstanding_pkts == 0)
921 list_del(&ptask->pt_link);
922
923 spin_unlock_irqrestore(&dev->lock, flags);
924
925 if (ptask->outstanding_pkts > 0) {
926 u16 dg_size;
927 u16 fg_off;
928 u16 datagram_label;
929 u16 lf;
930 struct sk_buff *skb;
931
932 /* Update the ptask to point to the next fragment and send it */
933 lf = fwnet_get_hdr_lf(&ptask->hdr);
934 switch (lf) {
935 case RFC2374_HDR_LASTFRAG:
936 case RFC2374_HDR_UNFRAG:
937 default:
938 fw_error("Outstanding packet %x lf %x, header %x,%x\n",
939 ptask->outstanding_pkts, lf, ptask->hdr.w0,
940 ptask->hdr.w1);
941 BUG();
942
943 case RFC2374_HDR_FIRSTFRAG:
944 /* Set frag type here for future interior fragments */
945 dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
946 fg_off = ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
947 datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
948 break;
949
950 case RFC2374_HDR_INTFRAG:
951 dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
952 fg_off = fwnet_get_hdr_fg_off(&ptask->hdr)
953 + ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
954 datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
955 break;
956 }
957 skb = ptask->skb;
958 skb_pull(skb, ptask->max_payload);
959 if (ptask->outstanding_pkts > 1) {
960 fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_INTFRAG,
961 dg_size, fg_off, datagram_label);
962 } else {
963 fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_LASTFRAG,
964 dg_size, fg_off, datagram_label);
965 ptask->max_payload = skb->len + RFC2374_FRAG_HDR_SIZE;
966 }
967 fwnet_send_packet(ptask);
968 }
969
970 if (free)
971 fwnet_free_ptask(ptask);
972 }
973
974 static void fwnet_write_complete(struct fw_card *card, int rcode,
975 void *payload, size_t length, void *data)
976 {
977 struct fwnet_packet_task *ptask;
978
979 ptask = data;
980
981 if (rcode == RCODE_COMPLETE)
982 fwnet_transmit_packet_done(ptask);
983 else
984 fw_error("fwnet_write_complete: failed: %x\n", rcode);
985 /* ??? error recovery */
986 }
987
988 static int fwnet_send_packet(struct fwnet_packet_task *ptask)
989 {
990 struct fwnet_device *dev;
991 unsigned tx_len;
992 struct rfc2734_header *bufhdr;
993 unsigned long flags;
994 bool free;
995
996 dev = ptask->dev;
997 tx_len = ptask->max_payload;
998 switch (fwnet_get_hdr_lf(&ptask->hdr)) {
999 case RFC2374_HDR_UNFRAG:
1000 bufhdr = (struct rfc2734_header *)
1001 skb_push(ptask->skb, RFC2374_UNFRAG_HDR_SIZE);
1002 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
1003 break;
1004
1005 case RFC2374_HDR_FIRSTFRAG:
1006 case RFC2374_HDR_INTFRAG:
1007 case RFC2374_HDR_LASTFRAG:
1008 bufhdr = (struct rfc2734_header *)
1009 skb_push(ptask->skb, RFC2374_FRAG_HDR_SIZE);
1010 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
1011 put_unaligned_be32(ptask->hdr.w1, &bufhdr->w1);
1012 break;
1013
1014 default:
1015 BUG();
1016 }
1017 if (ptask->dest_node == IEEE1394_ALL_NODES) {
1018 u8 *p;
1019 int generation;
1020 int node_id;
1021
1022 /* ptask->generation may not have been set yet */
1023 generation = dev->card->generation;
1024 smp_rmb();
1025 node_id = dev->card->node_id;
1026
1027 p = skb_push(ptask->skb, 8);
1028 put_unaligned_be32(node_id << 16 | IANA_SPECIFIER_ID >> 8, p);
1029 put_unaligned_be32((IANA_SPECIFIER_ID & 0xff) << 24
1030 | RFC2734_SW_VERSION, &p[4]);
1031
1032 /* We should not transmit if broadcast_channel.valid == 0. */
1033 fw_send_request(dev->card, &ptask->transaction,
1034 TCODE_STREAM_DATA,
1035 fw_stream_packet_destination_id(3,
1036 IEEE1394_BROADCAST_CHANNEL, 0),
1037 generation, SCODE_100, 0ULL, ptask->skb->data,
1038 tx_len + 8, fwnet_write_complete, ptask);
1039
1040 spin_lock_irqsave(&dev->lock, flags);
1041
1042 /* If the AT tasklet already ran, we may be last user. */
1043 free = (ptask->outstanding_pkts == 0 && list_empty(&ptask->pt_link));
1044 if (!free)
1045 list_add_tail(&ptask->pt_link, &dev->broadcasted_list);
1046
1047 spin_unlock_irqrestore(&dev->lock, flags);
1048
1049 goto out;
1050 }
1051
1052 fw_send_request(dev->card, &ptask->transaction,
1053 TCODE_WRITE_BLOCK_REQUEST, ptask->dest_node,
1054 ptask->generation, ptask->speed, ptask->fifo_addr,
1055 ptask->skb->data, tx_len, fwnet_write_complete, ptask);
1056
1057 spin_lock_irqsave(&dev->lock, flags);
1058
1059 /* If the AT tasklet already ran, we may be last user. */
1060 free = (ptask->outstanding_pkts == 0 && list_empty(&ptask->pt_link));
1061 if (!free)
1062 list_add_tail(&ptask->pt_link, &dev->sent_list);
1063
1064 spin_unlock_irqrestore(&dev->lock, flags);
1065
1066 dev->netdev->trans_start = jiffies;
1067 out:
1068 if (free)
1069 fwnet_free_ptask(ptask);
1070
1071 return 0;
1072 }
1073
1074 static int fwnet_broadcast_start(struct fwnet_device *dev)
1075 {
1076 struct fw_iso_context *context;
1077 int retval;
1078 unsigned num_packets;
1079 unsigned max_receive;
1080 struct fw_iso_packet packet;
1081 unsigned long offset;
1082 unsigned u;
1083
1084 if (dev->local_fifo == FWNET_NO_FIFO_ADDR) {
1085 /* outside OHCI posted write area? */
1086 static const struct fw_address_region region = {
1087 .start = 0xffff00000000ULL,
1088 .end = CSR_REGISTER_BASE,
1089 };
1090
1091 dev->handler.length = 4096;
1092 dev->handler.address_callback = fwnet_receive_packet;
1093 dev->handler.callback_data = dev;
1094
1095 retval = fw_core_add_address_handler(&dev->handler, &region);
1096 if (retval < 0)
1097 goto failed_initial;
1098
1099 dev->local_fifo = dev->handler.offset;
1100 }
1101
1102 max_receive = 1U << (dev->card->max_receive + 1);
1103 num_packets = (FWNET_ISO_PAGE_COUNT * PAGE_SIZE) / max_receive;
1104
1105 if (!dev->broadcast_rcv_context) {
1106 void **ptrptr;
1107
1108 context = fw_iso_context_create(dev->card,
1109 FW_ISO_CONTEXT_RECEIVE, IEEE1394_BROADCAST_CHANNEL,
1110 dev->card->link_speed, 8, fwnet_receive_broadcast, dev);
1111 if (IS_ERR(context)) {
1112 retval = PTR_ERR(context);
1113 goto failed_context_create;
1114 }
1115
1116 retval = fw_iso_buffer_init(&dev->broadcast_rcv_buffer,
1117 dev->card, FWNET_ISO_PAGE_COUNT, DMA_FROM_DEVICE);
1118 if (retval < 0)
1119 goto failed_buffer_init;
1120
1121 ptrptr = kmalloc(sizeof(void *) * num_packets, GFP_KERNEL);
1122 if (!ptrptr) {
1123 retval = -ENOMEM;
1124 goto failed_ptrs_alloc;
1125 }
1126
1127 dev->broadcast_rcv_buffer_ptrs = ptrptr;
1128 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++) {
1129 void *ptr;
1130 unsigned v;
1131
1132 ptr = kmap(dev->broadcast_rcv_buffer.pages[u]);
1133 for (v = 0; v < num_packets / FWNET_ISO_PAGE_COUNT; v++)
1134 *ptrptr++ = (void *)
1135 ((char *)ptr + v * max_receive);
1136 }
1137 dev->broadcast_rcv_context = context;
1138 } else {
1139 context = dev->broadcast_rcv_context;
1140 }
1141
1142 packet.payload_length = max_receive;
1143 packet.interrupt = 1;
1144 packet.skip = 0;
1145 packet.tag = 3;
1146 packet.sy = 0;
1147 packet.header_length = IEEE1394_GASP_HDR_SIZE;
1148 offset = 0;
1149
1150 for (u = 0; u < num_packets; u++) {
1151 retval = fw_iso_context_queue(context, &packet,
1152 &dev->broadcast_rcv_buffer, offset);
1153 if (retval < 0)
1154 goto failed_rcv_queue;
1155
1156 offset += max_receive;
1157 }
1158 dev->num_broadcast_rcv_ptrs = num_packets;
1159 dev->rcv_buffer_size = max_receive;
1160 dev->broadcast_rcv_next_ptr = 0U;
1161 retval = fw_iso_context_start(context, -1, 0,
1162 FW_ISO_CONTEXT_MATCH_ALL_TAGS); /* ??? sync */
1163 if (retval < 0)
1164 goto failed_rcv_queue;
1165
1166 /* FIXME: adjust it according to the min. speed of all known peers? */
1167 dev->broadcast_xmt_max_payload = IEEE1394_MAX_PAYLOAD_S100
1168 - IEEE1394_GASP_HDR_SIZE - RFC2374_UNFRAG_HDR_SIZE;
1169 dev->broadcast_state = FWNET_BROADCAST_RUNNING;
1170
1171 return 0;
1172
1173 failed_rcv_queue:
1174 kfree(dev->broadcast_rcv_buffer_ptrs);
1175 dev->broadcast_rcv_buffer_ptrs = NULL;
1176 failed_ptrs_alloc:
1177 fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer, dev->card);
1178 failed_buffer_init:
1179 fw_iso_context_destroy(context);
1180 dev->broadcast_rcv_context = NULL;
1181 failed_context_create:
1182 fw_core_remove_address_handler(&dev->handler);
1183 failed_initial:
1184 dev->local_fifo = FWNET_NO_FIFO_ADDR;
1185
1186 return retval;
1187 }
1188
1189 /* ifup */
1190 static int fwnet_open(struct net_device *net)
1191 {
1192 struct fwnet_device *dev = netdev_priv(net);
1193 int ret;
1194
1195 if (dev->broadcast_state == FWNET_BROADCAST_ERROR) {
1196 ret = fwnet_broadcast_start(dev);
1197 if (ret)
1198 return ret;
1199 }
1200 netif_start_queue(net);
1201
1202 return 0;
1203 }
1204
1205 /* ifdown */
1206 static int fwnet_stop(struct net_device *net)
1207 {
1208 netif_stop_queue(net);
1209
1210 /* Deallocate iso context for use by other applications? */
1211
1212 return 0;
1213 }
1214
1215 static netdev_tx_t fwnet_tx(struct sk_buff *skb, struct net_device *net)
1216 {
1217 struct fwnet_header hdr_buf;
1218 struct fwnet_device *dev = netdev_priv(net);
1219 __be16 proto;
1220 u16 dest_node;
1221 unsigned max_payload;
1222 u16 dg_size;
1223 u16 *datagram_label_ptr;
1224 struct fwnet_packet_task *ptask;
1225 struct fwnet_peer *peer;
1226 unsigned long flags;
1227
1228 ptask = kmem_cache_alloc(fwnet_packet_task_cache, GFP_ATOMIC);
1229 if (ptask == NULL)
1230 goto fail;
1231
1232 skb = skb_share_check(skb, GFP_ATOMIC);
1233 if (!skb)
1234 goto fail;
1235
1236 /*
1237 * Make a copy of the driver-specific header.
1238 * We might need to rebuild the header on tx failure.
1239 */
1240 memcpy(&hdr_buf, skb->data, sizeof(hdr_buf));
1241 skb_pull(skb, sizeof(hdr_buf));
1242
1243 proto = hdr_buf.h_proto;
1244 dg_size = skb->len;
1245
1246 /* serialize access to peer, including peer->datagram_label */
1247 spin_lock_irqsave(&dev->lock, flags);
1248
1249 /*
1250 * Set the transmission type for the packet. ARP packets and IP
1251 * broadcast packets are sent via GASP.
1252 */
1253 if (memcmp(hdr_buf.h_dest, net->broadcast, FWNET_ALEN) == 0
1254 || proto == htons(ETH_P_ARP)
1255 || (proto == htons(ETH_P_IP)
1256 && IN_MULTICAST(ntohl(ip_hdr(skb)->daddr)))) {
1257 max_payload = dev->broadcast_xmt_max_payload;
1258 datagram_label_ptr = &dev->broadcast_xmt_datagramlabel;
1259
1260 ptask->fifo_addr = FWNET_NO_FIFO_ADDR;
1261 ptask->generation = 0;
1262 ptask->dest_node = IEEE1394_ALL_NODES;
1263 ptask->speed = SCODE_100;
1264 } else {
1265 __be64 guid = get_unaligned((__be64 *)hdr_buf.h_dest);
1266 u8 generation;
1267
1268 peer = fwnet_peer_find_by_guid(dev, be64_to_cpu(guid));
1269 if (!peer || peer->fifo == FWNET_NO_FIFO_ADDR)
1270 goto fail_unlock;
1271
1272 generation = peer->generation;
1273 dest_node = peer->node_id;
1274 max_payload = peer->max_payload;
1275 datagram_label_ptr = &peer->datagram_label;
1276
1277 ptask->fifo_addr = peer->fifo;
1278 ptask->generation = generation;
1279 ptask->dest_node = dest_node;
1280 ptask->speed = peer->speed;
1281 }
1282
1283 /* If this is an ARP packet, convert it */
1284 if (proto == htons(ETH_P_ARP)) {
1285 struct arphdr *arp = (struct arphdr *)skb->data;
1286 unsigned char *arp_ptr = (unsigned char *)(arp + 1);
1287 struct rfc2734_arp *arp1394 = (struct rfc2734_arp *)skb->data;
1288 __be32 ipaddr;
1289
1290 ipaddr = get_unaligned((__be32 *)(arp_ptr + FWNET_ALEN));
1291
1292 arp1394->hw_addr_len = RFC2734_HW_ADDR_LEN;
1293 arp1394->max_rec = dev->card->max_receive;
1294 arp1394->sspd = dev->card->link_speed;
1295
1296 put_unaligned_be16(dev->local_fifo >> 32,
1297 &arp1394->fifo_hi);
1298 put_unaligned_be32(dev->local_fifo & 0xffffffff,
1299 &arp1394->fifo_lo);
1300 put_unaligned(ipaddr, &arp1394->sip);
1301 }
1302
1303 ptask->hdr.w0 = 0;
1304 ptask->hdr.w1 = 0;
1305 ptask->skb = skb;
1306 ptask->dev = dev;
1307
1308 /* Does it all fit in one packet? */
1309 if (dg_size <= max_payload) {
1310 fwnet_make_uf_hdr(&ptask->hdr, ntohs(proto));
1311 ptask->outstanding_pkts = 1;
1312 max_payload = dg_size + RFC2374_UNFRAG_HDR_SIZE;
1313 } else {
1314 u16 datagram_label;
1315
1316 max_payload -= RFC2374_FRAG_OVERHEAD;
1317 datagram_label = (*datagram_label_ptr)++;
1318 fwnet_make_ff_hdr(&ptask->hdr, ntohs(proto), dg_size,
1319 datagram_label);
1320 ptask->outstanding_pkts = DIV_ROUND_UP(dg_size, max_payload);
1321 max_payload += RFC2374_FRAG_HDR_SIZE;
1322 }
1323
1324 spin_unlock_irqrestore(&dev->lock, flags);
1325
1326 ptask->max_payload = max_payload;
1327 INIT_LIST_HEAD(&ptask->pt_link);
1328
1329 fwnet_send_packet(ptask);
1330
1331 return NETDEV_TX_OK;
1332
1333 fail_unlock:
1334 spin_unlock_irqrestore(&dev->lock, flags);
1335 fail:
1336 if (ptask)
1337 kmem_cache_free(fwnet_packet_task_cache, ptask);
1338
1339 if (skb != NULL)
1340 dev_kfree_skb(skb);
1341
1342 net->stats.tx_dropped++;
1343 net->stats.tx_errors++;
1344
1345 /*
1346 * FIXME: According to a patch from 2003-02-26, "returning non-zero
1347 * causes serious problems" here, allegedly. Before that patch,
1348 * -ERRNO was returned which is not appropriate under Linux 2.6.
1349 * Perhaps more needs to be done? Stop the queue in serious
1350 * conditions and restart it elsewhere?
1351 */
1352 return NETDEV_TX_OK;
1353 }
1354
1355 static int fwnet_change_mtu(struct net_device *net, int new_mtu)
1356 {
1357 if (new_mtu < 68)
1358 return -EINVAL;
1359
1360 net->mtu = new_mtu;
1361 return 0;
1362 }
1363
1364 static void fwnet_get_drvinfo(struct net_device *net,
1365 struct ethtool_drvinfo *info)
1366 {
1367 strcpy(info->driver, KBUILD_MODNAME);
1368 strcpy(info->bus_info, "ieee1394");
1369 }
1370
1371 static const struct ethtool_ops fwnet_ethtool_ops = {
1372 .get_drvinfo = fwnet_get_drvinfo,
1373 };
1374
1375 static const struct net_device_ops fwnet_netdev_ops = {
1376 .ndo_open = fwnet_open,
1377 .ndo_stop = fwnet_stop,
1378 .ndo_start_xmit = fwnet_tx,
1379 .ndo_change_mtu = fwnet_change_mtu,
1380 };
1381
1382 static void fwnet_init_dev(struct net_device *net)
1383 {
1384 net->header_ops = &fwnet_header_ops;
1385 net->netdev_ops = &fwnet_netdev_ops;
1386 net->watchdog_timeo = 2 * HZ;
1387 net->flags = IFF_BROADCAST | IFF_MULTICAST;
1388 net->features = NETIF_F_HIGHDMA;
1389 net->addr_len = FWNET_ALEN;
1390 net->hard_header_len = FWNET_HLEN;
1391 net->type = ARPHRD_IEEE1394;
1392 net->tx_queue_len = 10;
1393 SET_ETHTOOL_OPS(net, &fwnet_ethtool_ops);
1394 }
1395
1396 /* caller must hold fwnet_device_mutex */
1397 static struct fwnet_device *fwnet_dev_find(struct fw_card *card)
1398 {
1399 struct fwnet_device *dev;
1400
1401 list_for_each_entry(dev, &fwnet_device_list, dev_link)
1402 if (dev->card == card)
1403 return dev;
1404
1405 return NULL;
1406 }
1407
1408 static int fwnet_add_peer(struct fwnet_device *dev,
1409 struct fw_unit *unit, struct fw_device *device)
1410 {
1411 struct fwnet_peer *peer;
1412
1413 peer = kmalloc(sizeof(*peer), GFP_KERNEL);
1414 if (!peer)
1415 return -ENOMEM;
1416
1417 dev_set_drvdata(&unit->device, peer);
1418
1419 peer->dev = dev;
1420 peer->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4];
1421 peer->fifo = FWNET_NO_FIFO_ADDR;
1422 INIT_LIST_HEAD(&peer->pd_list);
1423 peer->pdg_size = 0;
1424 peer->datagram_label = 0;
1425 peer->speed = device->max_speed;
1426 peer->max_payload = fwnet_max_payload(device->max_rec, peer->speed);
1427
1428 peer->generation = device->generation;
1429 smp_rmb();
1430 peer->node_id = device->node_id;
1431
1432 spin_lock_irq(&dev->lock);
1433 list_add_tail(&peer->peer_link, &dev->peer_list);
1434 spin_unlock_irq(&dev->lock);
1435
1436 return 0;
1437 }
1438
1439 static int fwnet_probe(struct device *_dev)
1440 {
1441 struct fw_unit *unit = fw_unit(_dev);
1442 struct fw_device *device = fw_parent_device(unit);
1443 struct fw_card *card = device->card;
1444 struct net_device *net;
1445 bool allocated_netdev = false;
1446 struct fwnet_device *dev;
1447 unsigned max_mtu;
1448 int ret;
1449
1450 mutex_lock(&fwnet_device_mutex);
1451
1452 dev = fwnet_dev_find(card);
1453 if (dev) {
1454 net = dev->netdev;
1455 goto have_dev;
1456 }
1457
1458 net = alloc_netdev(sizeof(*dev), "firewire%d", fwnet_init_dev);
1459 if (net == NULL) {
1460 ret = -ENOMEM;
1461 goto out;
1462 }
1463
1464 allocated_netdev = true;
1465 SET_NETDEV_DEV(net, card->device);
1466 dev = netdev_priv(net);
1467
1468 spin_lock_init(&dev->lock);
1469 dev->broadcast_state = FWNET_BROADCAST_ERROR;
1470 dev->broadcast_rcv_context = NULL;
1471 dev->broadcast_xmt_max_payload = 0;
1472 dev->broadcast_xmt_datagramlabel = 0;
1473
1474 dev->local_fifo = FWNET_NO_FIFO_ADDR;
1475
1476 INIT_LIST_HEAD(&dev->packet_list);
1477 INIT_LIST_HEAD(&dev->broadcasted_list);
1478 INIT_LIST_HEAD(&dev->sent_list);
1479 INIT_LIST_HEAD(&dev->peer_list);
1480
1481 dev->card = card;
1482 dev->netdev = net;
1483
1484 /*
1485 * Use the RFC 2734 default 1500 octets or the maximum payload
1486 * as initial MTU
1487 */
1488 max_mtu = (1 << (card->max_receive + 1))
1489 - sizeof(struct rfc2734_header) - IEEE1394_GASP_HDR_SIZE;
1490 net->mtu = min(1500U, max_mtu);
1491
1492 /* Set our hardware address while we're at it */
1493 put_unaligned_be64(card->guid, net->dev_addr);
1494 put_unaligned_be64(~0ULL, net->broadcast);
1495 ret = register_netdev(net);
1496 if (ret) {
1497 fw_error("Cannot register the driver\n");
1498 goto out;
1499 }
1500
1501 list_add_tail(&dev->dev_link, &fwnet_device_list);
1502 fw_notify("%s: IPv4 over FireWire on device %016llx\n",
1503 net->name, (unsigned long long)card->guid);
1504 have_dev:
1505 ret = fwnet_add_peer(dev, unit, device);
1506 if (ret && allocated_netdev) {
1507 unregister_netdev(net);
1508 list_del(&dev->dev_link);
1509 }
1510 out:
1511 if (ret && allocated_netdev)
1512 free_netdev(net);
1513
1514 mutex_unlock(&fwnet_device_mutex);
1515
1516 return ret;
1517 }
1518
1519 static void fwnet_remove_peer(struct fwnet_peer *peer)
1520 {
1521 struct fwnet_partial_datagram *pd, *pd_next;
1522
1523 spin_lock_irq(&peer->dev->lock);
1524 list_del(&peer->peer_link);
1525 spin_unlock_irq(&peer->dev->lock);
1526
1527 list_for_each_entry_safe(pd, pd_next, &peer->pd_list, pd_link)
1528 fwnet_pd_delete(pd);
1529
1530 kfree(peer);
1531 }
1532
1533 static int fwnet_remove(struct device *_dev)
1534 {
1535 struct fwnet_peer *peer = dev_get_drvdata(_dev);
1536 struct fwnet_device *dev = peer->dev;
1537 struct net_device *net;
1538 struct fwnet_packet_task *ptask, *pt_next;
1539
1540 mutex_lock(&fwnet_device_mutex);
1541
1542 fwnet_remove_peer(peer);
1543
1544 if (list_empty(&dev->peer_list)) {
1545 net = dev->netdev;
1546 unregister_netdev(net);
1547
1548 if (dev->local_fifo != FWNET_NO_FIFO_ADDR)
1549 fw_core_remove_address_handler(&dev->handler);
1550 if (dev->broadcast_rcv_context) {
1551 fw_iso_context_stop(dev->broadcast_rcv_context);
1552 fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer,
1553 dev->card);
1554 fw_iso_context_destroy(dev->broadcast_rcv_context);
1555 }
1556 list_for_each_entry_safe(ptask, pt_next,
1557 &dev->packet_list, pt_link) {
1558 dev_kfree_skb_any(ptask->skb);
1559 kmem_cache_free(fwnet_packet_task_cache, ptask);
1560 }
1561 list_for_each_entry_safe(ptask, pt_next,
1562 &dev->broadcasted_list, pt_link) {
1563 dev_kfree_skb_any(ptask->skb);
1564 kmem_cache_free(fwnet_packet_task_cache, ptask);
1565 }
1566 list_for_each_entry_safe(ptask, pt_next,
1567 &dev->sent_list, pt_link) {
1568 dev_kfree_skb_any(ptask->skb);
1569 kmem_cache_free(fwnet_packet_task_cache, ptask);
1570 }
1571 list_del(&dev->dev_link);
1572
1573 free_netdev(net);
1574 }
1575
1576 mutex_unlock(&fwnet_device_mutex);
1577
1578 return 0;
1579 }
1580
1581 /*
1582 * FIXME abort partially sent fragmented datagrams,
1583 * discard partially received fragmented datagrams
1584 */
1585 static void fwnet_update(struct fw_unit *unit)
1586 {
1587 struct fw_device *device = fw_parent_device(unit);
1588 struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1589 int generation;
1590
1591 generation = device->generation;
1592
1593 spin_lock_irq(&peer->dev->lock);
1594 peer->node_id = device->node_id;
1595 peer->generation = generation;
1596 spin_unlock_irq(&peer->dev->lock);
1597 }
1598
1599 static const struct ieee1394_device_id fwnet_id_table[] = {
1600 {
1601 .match_flags = IEEE1394_MATCH_SPECIFIER_ID |
1602 IEEE1394_MATCH_VERSION,
1603 .specifier_id = IANA_SPECIFIER_ID,
1604 .version = RFC2734_SW_VERSION,
1605 },
1606 { }
1607 };
1608
1609 static struct fw_driver fwnet_driver = {
1610 .driver = {
1611 .owner = THIS_MODULE,
1612 .name = "net",
1613 .bus = &fw_bus_type,
1614 .probe = fwnet_probe,
1615 .remove = fwnet_remove,
1616 },
1617 .update = fwnet_update,
1618 .id_table = fwnet_id_table,
1619 };
1620
1621 static const u32 rfc2374_unit_directory_data[] = {
1622 0x00040000, /* directory_length */
1623 0x1200005e, /* unit_specifier_id: IANA */
1624 0x81000003, /* textual descriptor offset */
1625 0x13000001, /* unit_sw_version: RFC 2734 */
1626 0x81000005, /* textual descriptor offset */
1627 0x00030000, /* descriptor_length */
1628 0x00000000, /* text */
1629 0x00000000, /* minimal ASCII, en */
1630 0x49414e41, /* I A N A */
1631 0x00030000, /* descriptor_length */
1632 0x00000000, /* text */
1633 0x00000000, /* minimal ASCII, en */
1634 0x49507634, /* I P v 4 */
1635 };
1636
1637 static struct fw_descriptor rfc2374_unit_directory = {
1638 .length = ARRAY_SIZE(rfc2374_unit_directory_data),
1639 .key = (CSR_DIRECTORY | CSR_UNIT) << 24,
1640 .data = rfc2374_unit_directory_data
1641 };
1642
1643 static int __init fwnet_init(void)
1644 {
1645 int err;
1646
1647 err = fw_core_add_descriptor(&rfc2374_unit_directory);
1648 if (err)
1649 return err;
1650
1651 fwnet_packet_task_cache = kmem_cache_create("packet_task",
1652 sizeof(struct fwnet_packet_task), 0, 0, NULL);
1653 if (!fwnet_packet_task_cache) {
1654 err = -ENOMEM;
1655 goto out;
1656 }
1657
1658 err = driver_register(&fwnet_driver.driver);
1659 if (!err)
1660 return 0;
1661
1662 kmem_cache_destroy(fwnet_packet_task_cache);
1663 out:
1664 fw_core_remove_descriptor(&rfc2374_unit_directory);
1665
1666 return err;
1667 }
1668 module_init(fwnet_init);
1669
1670 static void __exit fwnet_cleanup(void)
1671 {
1672 driver_unregister(&fwnet_driver.driver);
1673 kmem_cache_destroy(fwnet_packet_task_cache);
1674 fw_core_remove_descriptor(&rfc2374_unit_directory);
1675 }
1676 module_exit(fwnet_cleanup);
1677
1678 MODULE_AUTHOR("Jay Fenlason <fenlason@redhat.com>");
1679 MODULE_DESCRIPTION("IPv4 over IEEE1394 as per RFC 2734");
1680 MODULE_LICENSE("GPL");
1681 MODULE_DEVICE_TABLE(ieee1394, fwnet_id_table);
Linus' kernel tree