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dm thin metadata: fix __udivdi3 undefined on 32-bit
[linux/fpc-iii.git] / drivers / firewire / net.c
blobb9d2f76a0cf7a036a2794436db34887bf75590fe
1 /*
2 * IPv4 over IEEE 1394, per RFC 2734
3 * IPv6 over IEEE 1394, per RFC 3146
4 *
5 * Copyright (C) 2009 Jay Fenlason <fenlason@redhat.com>
6 *
7 * based on eth1394 by Ben Collins et al
8 */
9
10 #include <linux/bug.h>
11 #include <linux/compiler.h>
12 #include <linux/delay.h>
13 #include <linux/device.h>
14 #include <linux/ethtool.h>
15 #include <linux/firewire.h>
16 #include <linux/firewire-constants.h>
17 #include <linux/highmem.h>
18 #include <linux/in.h>
19 #include <linux/ip.h>
20 #include <linux/jiffies.h>
21 #include <linux/mod_devicetable.h>
22 #include <linux/module.h>
23 #include <linux/moduleparam.h>
24 #include <linux/mutex.h>
25 #include <linux/netdevice.h>
26 #include <linux/skbuff.h>
27 #include <linux/slab.h>
28 #include <linux/spinlock.h>
29
30 #include <asm/unaligned.h>
31 #include <net/arp.h>
32 #include <net/firewire.h>
33
34 /* rx limits */
35 #define FWNET_MAX_FRAGMENTS 30 /* arbitrary, > TX queue depth */
36 #define FWNET_ISO_PAGE_COUNT (PAGE_SIZE < 16*1024 ? 4 : 2)
37
38 /* tx limits */
39 #define FWNET_MAX_QUEUED_DATAGRAMS 20 /* < 64 = number of tlabels */
40 #define FWNET_MIN_QUEUED_DATAGRAMS 10 /* should keep AT DMA busy enough */
41 #define FWNET_TX_QUEUE_LEN FWNET_MAX_QUEUED_DATAGRAMS /* ? */
42
43 #define IEEE1394_BROADCAST_CHANNEL 31
44 #define IEEE1394_ALL_NODES (0xffc0 | 0x003f)
45 #define IEEE1394_MAX_PAYLOAD_S100 512
46 #define FWNET_NO_FIFO_ADDR (~0ULL)
47
48 #define IANA_SPECIFIER_ID 0x00005eU
49 #define RFC2734_SW_VERSION 0x000001U
50 #define RFC3146_SW_VERSION 0x000002U
51
52 #define IEEE1394_GASP_HDR_SIZE 8
53
54 #define RFC2374_UNFRAG_HDR_SIZE 4
55 #define RFC2374_FRAG_HDR_SIZE 8
56 #define RFC2374_FRAG_OVERHEAD 4
57
58 #define RFC2374_HDR_UNFRAG 0 /* unfragmented */
59 #define RFC2374_HDR_FIRSTFRAG 1 /* first fragment */
60 #define RFC2374_HDR_LASTFRAG 2 /* last fragment */
61 #define RFC2374_HDR_INTFRAG 3 /* interior fragment */
62
63 static bool fwnet_hwaddr_is_multicast(u8 *ha)
64 {
65 return !!(*ha & 1);
66 }
67
68 /* IPv4 and IPv6 encapsulation header */
69 struct rfc2734_header {
70 u32 w0;
71 u32 w1;
72 };
73
74 #define fwnet_get_hdr_lf(h) (((h)->w0 & 0xc0000000) >> 30)
75 #define fwnet_get_hdr_ether_type(h) (((h)->w0 & 0x0000ffff))
76 #define fwnet_get_hdr_dg_size(h) ((((h)->w0 & 0x0fff0000) >> 16) + 1)
77 #define fwnet_get_hdr_fg_off(h) (((h)->w0 & 0x00000fff))
78 #define fwnet_get_hdr_dgl(h) (((h)->w1 & 0xffff0000) >> 16)
79
80 #define fwnet_set_hdr_lf(lf) ((lf) << 30)
81 #define fwnet_set_hdr_ether_type(et) (et)
82 #define fwnet_set_hdr_dg_size(dgs) (((dgs) - 1) << 16)
83 #define fwnet_set_hdr_fg_off(fgo) (fgo)
84
85 #define fwnet_set_hdr_dgl(dgl) ((dgl) << 16)
86
87 static inline void fwnet_make_uf_hdr(struct rfc2734_header *hdr,
88 unsigned ether_type)
89 {
90 hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_UNFRAG)
91 | fwnet_set_hdr_ether_type(ether_type);
92 }
93
94 static inline void fwnet_make_ff_hdr(struct rfc2734_header *hdr,
95 unsigned ether_type, unsigned dg_size, unsigned dgl)
96 {
97 hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_FIRSTFRAG)
98 | fwnet_set_hdr_dg_size(dg_size)
99 | fwnet_set_hdr_ether_type(ether_type);
100 hdr->w1 = fwnet_set_hdr_dgl(dgl);
101 }
102
103 static inline void fwnet_make_sf_hdr(struct rfc2734_header *hdr,
104 unsigned lf, unsigned dg_size, unsigned fg_off, unsigned dgl)
105 {
106 hdr->w0 = fwnet_set_hdr_lf(lf)
107 | fwnet_set_hdr_dg_size(dg_size)
108 | fwnet_set_hdr_fg_off(fg_off);
109 hdr->w1 = fwnet_set_hdr_dgl(dgl);
110 }
111
112 /* This list keeps track of what parts of the datagram have been filled in */
113 struct fwnet_fragment_info {
114 struct list_head fi_link;
115 u16 offset;
116 u16 len;
117 };
118
119 struct fwnet_partial_datagram {
120 struct list_head pd_link;
121 struct list_head fi_list;
122 struct sk_buff *skb;
123 /* FIXME Why not use skb->data? */
124 char *pbuf;
125 u16 datagram_label;
126 u16 ether_type;
127 u16 datagram_size;
128 };
129
130 static DEFINE_MUTEX(fwnet_device_mutex);
131 static LIST_HEAD(fwnet_device_list);
132
133 struct fwnet_device {
134 struct list_head dev_link;
135 spinlock_t lock;
136 enum {
137 FWNET_BROADCAST_ERROR,
138 FWNET_BROADCAST_RUNNING,
139 FWNET_BROADCAST_STOPPED,
140 } broadcast_state;
141 struct fw_iso_context *broadcast_rcv_context;
142 struct fw_iso_buffer broadcast_rcv_buffer;
143 void **broadcast_rcv_buffer_ptrs;
144 unsigned broadcast_rcv_next_ptr;
145 unsigned num_broadcast_rcv_ptrs;
146 unsigned rcv_buffer_size;
147 /*
148 * This value is the maximum unfragmented datagram size that can be
149 * sent by the hardware. It already has the GASP overhead and the
150 * unfragmented datagram header overhead calculated into it.
151 */
152 unsigned broadcast_xmt_max_payload;
153 u16 broadcast_xmt_datagramlabel;
154
155 /*
156 * The CSR address that remote nodes must send datagrams to for us to
157 * receive them.
158 */
159 struct fw_address_handler handler;
160 u64 local_fifo;
161
162 /* Number of tx datagrams that have been queued but not yet acked */
163 int queued_datagrams;
164
165 int peer_count;
166 struct list_head peer_list;
167 struct fw_card *card;
168 struct net_device *netdev;
169 };
170
171 struct fwnet_peer {
172 struct list_head peer_link;
173 struct fwnet_device *dev;
174 u64 guid;
175
176 /* guarded by dev->lock */
177 struct list_head pd_list; /* received partial datagrams */
178 unsigned pdg_size; /* pd_list size */
179
180 u16 datagram_label; /* outgoing datagram label */
181 u16 max_payload; /* includes RFC2374_FRAG_HDR_SIZE overhead */
182 int node_id;
183 int generation;
184 unsigned speed;
185 };
186
187 /* This is our task struct. It's used for the packet complete callback. */
188 struct fwnet_packet_task {
189 struct fw_transaction transaction;
190 struct rfc2734_header hdr;
191 struct sk_buff *skb;
192 struct fwnet_device *dev;
193
194 int outstanding_pkts;
195 u64 fifo_addr;
196 u16 dest_node;
197 u16 max_payload;
198 u8 generation;
199 u8 speed;
200 u8 enqueued;
201 };
202
203 /*
204 * Get fifo address embedded in hwaddr
205 */
206 static __u64 fwnet_hwaddr_fifo(union fwnet_hwaddr *ha)
207 {
208 return (u64)get_unaligned_be16(&ha->uc.fifo_hi) << 32
209 | get_unaligned_be32(&ha->uc.fifo_lo);
210 }
211
212 /*
213 * saddr == NULL means use device source address.
214 * daddr == NULL means leave destination address (eg unresolved arp).
215 */
216 static int fwnet_header_create(struct sk_buff *skb, struct net_device *net,
217 unsigned short type, const void *daddr,
218 const void *saddr, unsigned len)
219 {
220 struct fwnet_header *h;
221
222 h = (struct fwnet_header *)skb_push(skb, sizeof(*h));
223 put_unaligned_be16(type, &h->h_proto);
224
225 if (net->flags & (IFF_LOOPBACK | IFF_NOARP)) {
226 memset(h->h_dest, 0, net->addr_len);
227
228 return net->hard_header_len;
229 }
230
231 if (daddr) {
232 memcpy(h->h_dest, daddr, net->addr_len);
233
234 return net->hard_header_len;
235 }
236
237 return -net->hard_header_len;
238 }
239
240 static int fwnet_header_cache(const struct neighbour *neigh,
241 struct hh_cache *hh, __be16 type)
242 {
243 struct net_device *net;
244 struct fwnet_header *h;
245
246 if (type == cpu_to_be16(ETH_P_802_3))
247 return -1;
248 net = neigh->dev;
249 h = (struct fwnet_header *)((u8 *)hh->hh_data + HH_DATA_OFF(sizeof(*h)));
250 h->h_proto = type;
251 memcpy(h->h_dest, neigh->ha, net->addr_len);
252 hh->hh_len = FWNET_HLEN;
253
254 return 0;
255 }
256
257 /* Called by Address Resolution module to notify changes in address. */
258 static void fwnet_header_cache_update(struct hh_cache *hh,
259 const struct net_device *net, const unsigned char *haddr)
260 {
261 memcpy((u8 *)hh->hh_data + HH_DATA_OFF(FWNET_HLEN), haddr, net->addr_len);
262 }
263
264 static int fwnet_header_parse(const struct sk_buff *skb, unsigned char *haddr)
265 {
266 memcpy(haddr, skb->dev->dev_addr, FWNET_ALEN);
267
268 return FWNET_ALEN;
269 }
270
271 static const struct header_ops fwnet_header_ops = {
272 .create = fwnet_header_create,
273 .cache = fwnet_header_cache,
274 .cache_update = fwnet_header_cache_update,
275 .parse = fwnet_header_parse,
276 };
277
278 /* FIXME: is this correct for all cases? */
279 static bool fwnet_frag_overlap(struct fwnet_partial_datagram *pd,
280 unsigned offset, unsigned len)
281 {
282 struct fwnet_fragment_info *fi;
283 unsigned end = offset + len;
284
285 list_for_each_entry(fi, &pd->fi_list, fi_link)
286 if (offset < fi->offset + fi->len && end > fi->offset)
287 return true;
288
289 return false;
290 }
291
292 /* Assumes that new fragment does not overlap any existing fragments */
293 static struct fwnet_fragment_info *fwnet_frag_new(
294 struct fwnet_partial_datagram *pd, unsigned offset, unsigned len)
295 {
296 struct fwnet_fragment_info *fi, *fi2, *new;
297 struct list_head *list;
298
299 list = &pd->fi_list;
300 list_for_each_entry(fi, &pd->fi_list, fi_link) {
301 if (fi->offset + fi->len == offset) {
302 /* The new fragment can be tacked on to the end */
303 /* Did the new fragment plug a hole? */
304 fi2 = list_entry(fi->fi_link.next,
305 struct fwnet_fragment_info, fi_link);
306 if (fi->offset + fi->len == fi2->offset) {
307 /* glue fragments together */
308 fi->len += len + fi2->len;
309 list_del(&fi2->fi_link);
310 kfree(fi2);
311 } else {
312 fi->len += len;
313 }
314
315 return fi;
316 }
317 if (offset + len == fi->offset) {
318 /* The new fragment can be tacked on to the beginning */
319 /* Did the new fragment plug a hole? */
320 fi2 = list_entry(fi->fi_link.prev,
321 struct fwnet_fragment_info, fi_link);
322 if (fi2->offset + fi2->len == fi->offset) {
323 /* glue fragments together */
324 fi2->len += fi->len + len;
325 list_del(&fi->fi_link);
326 kfree(fi);
327
328 return fi2;
329 }
330 fi->offset = offset;
331 fi->len += len;
332
333 return fi;
334 }
335 if (offset > fi->offset + fi->len) {
336 list = &fi->fi_link;
337 break;
338 }
339 if (offset + len < fi->offset) {
340 list = fi->fi_link.prev;
341 break;
342 }
343 }
344
345 new = kmalloc(sizeof(*new), GFP_ATOMIC);
346 if (!new)
347 return NULL;
348
349 new->offset = offset;
350 new->len = len;
351 list_add(&new->fi_link, list);
352
353 return new;
354 }
355
356 static struct fwnet_partial_datagram *fwnet_pd_new(struct net_device *net,
357 struct fwnet_peer *peer, u16 datagram_label, unsigned dg_size,
358 void *frag_buf, unsigned frag_off, unsigned frag_len)
359 {
360 struct fwnet_partial_datagram *new;
361 struct fwnet_fragment_info *fi;
362
363 new = kmalloc(sizeof(*new), GFP_ATOMIC);
364 if (!new)
365 goto fail;
366
367 INIT_LIST_HEAD(&new->fi_list);
368 fi = fwnet_frag_new(new, frag_off, frag_len);
369 if (fi == NULL)
370 goto fail_w_new;
371
372 new->datagram_label = datagram_label;
373 new->datagram_size = dg_size;
374 new->skb = dev_alloc_skb(dg_size + LL_RESERVED_SPACE(net));
375 if (new->skb == NULL)
376 goto fail_w_fi;
377
378 skb_reserve(new->skb, LL_RESERVED_SPACE(net));
379 new->pbuf = skb_put(new->skb, dg_size);
380 memcpy(new->pbuf + frag_off, frag_buf, frag_len);
381 list_add_tail(&new->pd_link, &peer->pd_list);
382
383 return new;
384
385 fail_w_fi:
386 kfree(fi);
387 fail_w_new:
388 kfree(new);
389 fail:
390 return NULL;
391 }
392
393 static struct fwnet_partial_datagram *fwnet_pd_find(struct fwnet_peer *peer,
394 u16 datagram_label)
395 {
396 struct fwnet_partial_datagram *pd;
397
398 list_for_each_entry(pd, &peer->pd_list, pd_link)
399 if (pd->datagram_label == datagram_label)
400 return pd;
401
402 return NULL;
403 }
404
405
406 static void fwnet_pd_delete(struct fwnet_partial_datagram *old)
407 {
408 struct fwnet_fragment_info *fi, *n;
409
410 list_for_each_entry_safe(fi, n, &old->fi_list, fi_link)
411 kfree(fi);
412
413 list_del(&old->pd_link);
414 dev_kfree_skb_any(old->skb);
415 kfree(old);
416 }
417
418 static bool fwnet_pd_update(struct fwnet_peer *peer,
419 struct fwnet_partial_datagram *pd, void *frag_buf,
420 unsigned frag_off, unsigned frag_len)
421 {
422 if (fwnet_frag_new(pd, frag_off, frag_len) == NULL)
423 return false;
424
425 memcpy(pd->pbuf + frag_off, frag_buf, frag_len);
426
427 /*
428 * Move list entry to beginning of list so that oldest partial
429 * datagrams percolate to the end of the list
430 */
431 list_move_tail(&pd->pd_link, &peer->pd_list);
432
433 return true;
434 }
435
436 static bool fwnet_pd_is_complete(struct fwnet_partial_datagram *pd)
437 {
438 struct fwnet_fragment_info *fi;
439
440 fi = list_entry(pd->fi_list.next, struct fwnet_fragment_info, fi_link);
441
442 return fi->len == pd->datagram_size;
443 }
444
445 /* caller must hold dev->lock */
446 static struct fwnet_peer *fwnet_peer_find_by_guid(struct fwnet_device *dev,
447 u64 guid)
448 {
449 struct fwnet_peer *peer;
450
451 list_for_each_entry(peer, &dev->peer_list, peer_link)
452 if (peer->guid == guid)
453 return peer;
454
455 return NULL;
456 }
457
458 /* caller must hold dev->lock */
459 static struct fwnet_peer *fwnet_peer_find_by_node_id(struct fwnet_device *dev,
460 int node_id, int generation)
461 {
462 struct fwnet_peer *peer;
463
464 list_for_each_entry(peer, &dev->peer_list, peer_link)
465 if (peer->node_id == node_id &&
466 peer->generation == generation)
467 return peer;
468
469 return NULL;
470 }
471
472 /* See IEEE 1394-2008 table 6-4, table 8-8, table 16-18. */
473 static unsigned fwnet_max_payload(unsigned max_rec, unsigned speed)
474 {
475 max_rec = min(max_rec, speed + 8);
476 max_rec = clamp(max_rec, 8U, 11U); /* 512...4096 */
477
478 return (1 << (max_rec + 1)) - RFC2374_FRAG_HDR_SIZE;
479 }
480
481
482 static int fwnet_finish_incoming_packet(struct net_device *net,
483 struct sk_buff *skb, u16 source_node_id,
484 bool is_broadcast, u16 ether_type)
485 {
486 struct fwnet_device *dev;
487 int status;
488 __be64 guid;
489
490 switch (ether_type) {
491 case ETH_P_ARP:
492 case ETH_P_IP:
493 #if IS_ENABLED(CONFIG_IPV6)
494 case ETH_P_IPV6:
495 #endif
496 break;
497 default:
498 goto err;
499 }
500
501 dev = netdev_priv(net);
502 /* Write metadata, and then pass to the receive level */
503 skb->dev = net;
504 skb->ip_summed = CHECKSUM_NONE;
505
506 /*
507 * Parse the encapsulation header. This actually does the job of
508 * converting to an ethernet-like pseudo frame header.
509 */
510 guid = cpu_to_be64(dev->card->guid);
511 if (dev_hard_header(skb, net, ether_type,
512 is_broadcast ? net->broadcast : net->dev_addr,
513 NULL, skb->len) >= 0) {
514 struct fwnet_header *eth;
515 u16 *rawp;
516 __be16 protocol;
517
518 skb_reset_mac_header(skb);
519 skb_pull(skb, sizeof(*eth));
520 eth = (struct fwnet_header *)skb_mac_header(skb);
521 if (fwnet_hwaddr_is_multicast(eth->h_dest)) {
522 if (memcmp(eth->h_dest, net->broadcast,
523 net->addr_len) == 0)
524 skb->pkt_type = PACKET_BROADCAST;
525 #if 0
526 else
527 skb->pkt_type = PACKET_MULTICAST;
528 #endif
529 } else {
530 if (memcmp(eth->h_dest, net->dev_addr, net->addr_len))
531 skb->pkt_type = PACKET_OTHERHOST;
532 }
533 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN) {
534 protocol = eth->h_proto;
535 } else {
536 rawp = (u16 *)skb->data;
537 if (*rawp == 0xffff)
538 protocol = htons(ETH_P_802_3);
539 else
540 protocol = htons(ETH_P_802_2);
541 }
542 skb->protocol = protocol;
543 }
544 status = netif_rx(skb);
545 if (status == NET_RX_DROP) {
546 net->stats.rx_errors++;
547 net->stats.rx_dropped++;
548 } else {
549 net->stats.rx_packets++;
550 net->stats.rx_bytes += skb->len;
551 }
552
553 return 0;
554
555 err:
556 net->stats.rx_errors++;
557 net->stats.rx_dropped++;
558
559 dev_kfree_skb_any(skb);
560
561 return -ENOENT;
562 }
563
564 static int fwnet_incoming_packet(struct fwnet_device *dev, __be32 *buf, int len,
565 int source_node_id, int generation,
566 bool is_broadcast)
567 {
568 struct sk_buff *skb;
569 struct net_device *net = dev->netdev;
570 struct rfc2734_header hdr;
571 unsigned lf;
572 unsigned long flags;
573 struct fwnet_peer *peer;
574 struct fwnet_partial_datagram *pd;
575 int fg_off;
576 int dg_size;
577 u16 datagram_label;
578 int retval;
579 u16 ether_type;
580
581 if (len <= RFC2374_UNFRAG_HDR_SIZE)
582 return 0;
583
584 hdr.w0 = be32_to_cpu(buf[0]);
585 lf = fwnet_get_hdr_lf(&hdr);
586 if (lf == RFC2374_HDR_UNFRAG) {
587 /*
588 * An unfragmented datagram has been received by the ieee1394
589 * bus. Build an skbuff around it so we can pass it to the
590 * high level network layer.
591 */
592 ether_type = fwnet_get_hdr_ether_type(&hdr);
593 buf++;
594 len -= RFC2374_UNFRAG_HDR_SIZE;
595
596 skb = dev_alloc_skb(len + LL_RESERVED_SPACE(net));
597 if (unlikely(!skb)) {
598 net->stats.rx_dropped++;
599
600 return -ENOMEM;
601 }
602 skb_reserve(skb, LL_RESERVED_SPACE(net));
603 memcpy(skb_put(skb, len), buf, len);
604
605 return fwnet_finish_incoming_packet(net, skb, source_node_id,
606 is_broadcast, ether_type);
607 }
608
609 /* A datagram fragment has been received, now the fun begins. */
610
611 if (len <= RFC2374_FRAG_HDR_SIZE)
612 return 0;
613
614 hdr.w1 = ntohl(buf[1]);
615 buf += 2;
616 len -= RFC2374_FRAG_HDR_SIZE;
617 if (lf == RFC2374_HDR_FIRSTFRAG) {
618 ether_type = fwnet_get_hdr_ether_type(&hdr);
619 fg_off = 0;
620 } else {
621 ether_type = 0;
622 fg_off = fwnet_get_hdr_fg_off(&hdr);
623 }
624 datagram_label = fwnet_get_hdr_dgl(&hdr);
625 dg_size = fwnet_get_hdr_dg_size(&hdr);
626
627 if (fg_off + len > dg_size)
628 return 0;
629
630 spin_lock_irqsave(&dev->lock, flags);
631
632 peer = fwnet_peer_find_by_node_id(dev, source_node_id, generation);
633 if (!peer) {
634 retval = -ENOENT;
635 goto fail;
636 }
637
638 pd = fwnet_pd_find(peer, datagram_label);
639 if (pd == NULL) {
640 while (peer->pdg_size >= FWNET_MAX_FRAGMENTS) {
641 /* remove the oldest */
642 fwnet_pd_delete(list_first_entry(&peer->pd_list,
643 struct fwnet_partial_datagram, pd_link));
644 peer->pdg_size--;
645 }
646 pd = fwnet_pd_new(net, peer, datagram_label,
647 dg_size, buf, fg_off, len);
648 if (pd == NULL) {
649 retval = -ENOMEM;
650 goto fail;
651 }
652 peer->pdg_size++;
653 } else {
654 if (fwnet_frag_overlap(pd, fg_off, len) ||
655 pd->datagram_size != dg_size) {
656 /*
657 * Differing datagram sizes or overlapping fragments,
658 * discard old datagram and start a new one.
659 */
660 fwnet_pd_delete(pd);
661 pd = fwnet_pd_new(net, peer, datagram_label,
662 dg_size, buf, fg_off, len);
663 if (pd == NULL) {
664 peer->pdg_size--;
665 retval = -ENOMEM;
666 goto fail;
667 }
668 } else {
669 if (!fwnet_pd_update(peer, pd, buf, fg_off, len)) {
670 /*
671 * Couldn't save off fragment anyway
672 * so might as well obliterate the
673 * datagram now.
674 */
675 fwnet_pd_delete(pd);
676 peer->pdg_size--;
677 retval = -ENOMEM;
678 goto fail;
679 }
680 }
681 } /* new datagram or add to existing one */
682
683 if (lf == RFC2374_HDR_FIRSTFRAG)
684 pd->ether_type = ether_type;
685
686 if (fwnet_pd_is_complete(pd)) {
687 ether_type = pd->ether_type;
688 peer->pdg_size--;
689 skb = skb_get(pd->skb);
690 fwnet_pd_delete(pd);
691
692 spin_unlock_irqrestore(&dev->lock, flags);
693
694 return fwnet_finish_incoming_packet(net, skb, source_node_id,
695 false, ether_type);
696 }
697 /*
698 * Datagram is not complete, we're done for the
699 * moment.
700 */
701 retval = 0;
702 fail:
703 spin_unlock_irqrestore(&dev->lock, flags);
704
705 return retval;
706 }
707
708 static void fwnet_receive_packet(struct fw_card *card, struct fw_request *r,
709 int tcode, int destination, int source, int generation,
710 unsigned long long offset, void *payload, size_t length,
711 void *callback_data)
712 {
713 struct fwnet_device *dev = callback_data;
714 int rcode;
715
716 if (destination == IEEE1394_ALL_NODES) {
717 kfree(r);
718
719 return;
720 }
721
722 if (offset != dev->handler.offset)
723 rcode = RCODE_ADDRESS_ERROR;
724 else if (tcode != TCODE_WRITE_BLOCK_REQUEST)
725 rcode = RCODE_TYPE_ERROR;
726 else if (fwnet_incoming_packet(dev, payload, length,
727 source, generation, false) != 0) {
728 dev_err(&dev->netdev->dev, "incoming packet failure\n");
729 rcode = RCODE_CONFLICT_ERROR;
730 } else
731 rcode = RCODE_COMPLETE;
732
733 fw_send_response(card, r, rcode);
734 }
735
736 static int gasp_source_id(__be32 *p)
737 {
738 return be32_to_cpu(p[0]) >> 16;
739 }
740
741 static u32 gasp_specifier_id(__be32 *p)
742 {
743 return (be32_to_cpu(p[0]) & 0xffff) << 8 |
744 (be32_to_cpu(p[1]) & 0xff000000) >> 24;
745 }
746
747 static u32 gasp_version(__be32 *p)
748 {
749 return be32_to_cpu(p[1]) & 0xffffff;
750 }
751
752 static void fwnet_receive_broadcast(struct fw_iso_context *context,
753 u32 cycle, size_t header_length, void *header, void *data)
754 {
755 struct fwnet_device *dev;
756 struct fw_iso_packet packet;
757 __be16 *hdr_ptr;
758 __be32 *buf_ptr;
759 int retval;
760 u32 length;
761 unsigned long offset;
762 unsigned long flags;
763
764 dev = data;
765 hdr_ptr = header;
766 length = be16_to_cpup(hdr_ptr);
767
768 spin_lock_irqsave(&dev->lock, flags);
769
770 offset = dev->rcv_buffer_size * dev->broadcast_rcv_next_ptr;
771 buf_ptr = dev->broadcast_rcv_buffer_ptrs[dev->broadcast_rcv_next_ptr++];
772 if (dev->broadcast_rcv_next_ptr == dev->num_broadcast_rcv_ptrs)
773 dev->broadcast_rcv_next_ptr = 0;
774
775 spin_unlock_irqrestore(&dev->lock, flags);
776
777 if (length > IEEE1394_GASP_HDR_SIZE &&
778 gasp_specifier_id(buf_ptr) == IANA_SPECIFIER_ID &&
779 (gasp_version(buf_ptr) == RFC2734_SW_VERSION
780 #if IS_ENABLED(CONFIG_IPV6)
781 || gasp_version(buf_ptr) == RFC3146_SW_VERSION
782 #endif
783 ))
784 fwnet_incoming_packet(dev, buf_ptr + 2,
785 length - IEEE1394_GASP_HDR_SIZE,
786 gasp_source_id(buf_ptr),
787 context->card->generation, true);
788
789 packet.payload_length = dev->rcv_buffer_size;
790 packet.interrupt = 1;
791 packet.skip = 0;
792 packet.tag = 3;
793 packet.sy = 0;
794 packet.header_length = IEEE1394_GASP_HDR_SIZE;
795
796 spin_lock_irqsave(&dev->lock, flags);
797
798 retval = fw_iso_context_queue(dev->broadcast_rcv_context, &packet,
799 &dev->broadcast_rcv_buffer, offset);
800
801 spin_unlock_irqrestore(&dev->lock, flags);
802
803 if (retval >= 0)
804 fw_iso_context_queue_flush(dev->broadcast_rcv_context);
805 else
806 dev_err(&dev->netdev->dev, "requeue failed\n");
807 }
808
809 static struct kmem_cache *fwnet_packet_task_cache;
810
811 static void fwnet_free_ptask(struct fwnet_packet_task *ptask)
812 {
813 dev_kfree_skb_any(ptask->skb);
814 kmem_cache_free(fwnet_packet_task_cache, ptask);
815 }
816
817 /* Caller must hold dev->lock. */
818 static void dec_queued_datagrams(struct fwnet_device *dev)
819 {
820 if (--dev->queued_datagrams == FWNET_MIN_QUEUED_DATAGRAMS)
821 netif_wake_queue(dev->netdev);
822 }
823
824 static int fwnet_send_packet(struct fwnet_packet_task *ptask);
825
826 static void fwnet_transmit_packet_done(struct fwnet_packet_task *ptask)
827 {
828 struct fwnet_device *dev = ptask->dev;
829 struct sk_buff *skb = ptask->skb;
830 unsigned long flags;
831 bool free;
832
833 spin_lock_irqsave(&dev->lock, flags);
834
835 ptask->outstanding_pkts--;
836
837 /* Check whether we or the networking TX soft-IRQ is last user. */
838 free = (ptask->outstanding_pkts == 0 && ptask->enqueued);
839 if (free)
840 dec_queued_datagrams(dev);
841
842 if (ptask->outstanding_pkts == 0) {
843 dev->netdev->stats.tx_packets++;
844 dev->netdev->stats.tx_bytes += skb->len;
845 }
846
847 spin_unlock_irqrestore(&dev->lock, flags);
848
849 if (ptask->outstanding_pkts > 0) {
850 u16 dg_size;
851 u16 fg_off;
852 u16 datagram_label;
853 u16 lf;
854
855 /* Update the ptask to point to the next fragment and send it */
856 lf = fwnet_get_hdr_lf(&ptask->hdr);
857 switch (lf) {
858 case RFC2374_HDR_LASTFRAG:
859 case RFC2374_HDR_UNFRAG:
860 default:
861 dev_err(&dev->netdev->dev,
862 "outstanding packet %x lf %x, header %x,%x\n",
863 ptask->outstanding_pkts, lf, ptask->hdr.w0,
864 ptask->hdr.w1);
865 BUG();
866
867 case RFC2374_HDR_FIRSTFRAG:
868 /* Set frag type here for future interior fragments */
869 dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
870 fg_off = ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
871 datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
872 break;
873
874 case RFC2374_HDR_INTFRAG:
875 dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
876 fg_off = fwnet_get_hdr_fg_off(&ptask->hdr)
877 + ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
878 datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
879 break;
880 }
881
882 if (ptask->dest_node == IEEE1394_ALL_NODES) {
883 skb_pull(skb,
884 ptask->max_payload + IEEE1394_GASP_HDR_SIZE);
885 } else {
886 skb_pull(skb, ptask->max_payload);
887 }
888 if (ptask->outstanding_pkts > 1) {
889 fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_INTFRAG,
890 dg_size, fg_off, datagram_label);
891 } else {
892 fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_LASTFRAG,
893 dg_size, fg_off, datagram_label);
894 ptask->max_payload = skb->len + RFC2374_FRAG_HDR_SIZE;
895 }
896 fwnet_send_packet(ptask);
897 }
898
899 if (free)
900 fwnet_free_ptask(ptask);
901 }
902
903 static void fwnet_transmit_packet_failed(struct fwnet_packet_task *ptask)
904 {
905 struct fwnet_device *dev = ptask->dev;
906 unsigned long flags;
907 bool free;
908
909 spin_lock_irqsave(&dev->lock, flags);
910
911 /* One fragment failed; don't try to send remaining fragments. */
912 ptask->outstanding_pkts = 0;
913
914 /* Check whether we or the networking TX soft-IRQ is last user. */
915 free = ptask->enqueued;
916 if (free)
917 dec_queued_datagrams(dev);
918
919 dev->netdev->stats.tx_dropped++;
920 dev->netdev->stats.tx_errors++;
921
922 spin_unlock_irqrestore(&dev->lock, flags);
923
924 if (free)
925 fwnet_free_ptask(ptask);
926 }
927
928 static void fwnet_write_complete(struct fw_card *card, int rcode,
929 void *payload, size_t length, void *data)
930 {
931 struct fwnet_packet_task *ptask = data;
932 static unsigned long j;
933 static int last_rcode, errors_skipped;
934
935 if (rcode == RCODE_COMPLETE) {
936 fwnet_transmit_packet_done(ptask);
937 } else {
938 if (printk_timed_ratelimit(&j, 1000) || rcode != last_rcode) {
939 dev_err(&ptask->dev->netdev->dev,
940 "fwnet_write_complete failed: %x (skipped %d)\n",
941 rcode, errors_skipped);
942
943 errors_skipped = 0;
944 last_rcode = rcode;
945 } else {
946 errors_skipped++;
947 }
948 fwnet_transmit_packet_failed(ptask);
949 }
950 }
951
952 static int fwnet_send_packet(struct fwnet_packet_task *ptask)
953 {
954 struct fwnet_device *dev;
955 unsigned tx_len;
956 struct rfc2734_header *bufhdr;
957 unsigned long flags;
958 bool free;
959
960 dev = ptask->dev;
961 tx_len = ptask->max_payload;
962 switch (fwnet_get_hdr_lf(&ptask->hdr)) {
963 case RFC2374_HDR_UNFRAG:
964 bufhdr = (struct rfc2734_header *)
965 skb_push(ptask->skb, RFC2374_UNFRAG_HDR_SIZE);
966 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
967 break;
968
969 case RFC2374_HDR_FIRSTFRAG:
970 case RFC2374_HDR_INTFRAG:
971 case RFC2374_HDR_LASTFRAG:
972 bufhdr = (struct rfc2734_header *)
973 skb_push(ptask->skb, RFC2374_FRAG_HDR_SIZE);
974 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
975 put_unaligned_be32(ptask->hdr.w1, &bufhdr->w1);
976 break;
977
978 default:
979 BUG();
980 }
981 if (ptask->dest_node == IEEE1394_ALL_NODES) {
982 u8 *p;
983 int generation;
984 int node_id;
985 unsigned int sw_version;
986
987 /* ptask->generation may not have been set yet */
988 generation = dev->card->generation;
989 smp_rmb();
990 node_id = dev->card->node_id;
991
992 switch (ptask->skb->protocol) {
993 default:
994 sw_version = RFC2734_SW_VERSION;
995 break;
996 #if IS_ENABLED(CONFIG_IPV6)
997 case htons(ETH_P_IPV6):
998 sw_version = RFC3146_SW_VERSION;
999 #endif
1000 }
1001
1002 p = skb_push(ptask->skb, IEEE1394_GASP_HDR_SIZE);
1003 put_unaligned_be32(node_id << 16 | IANA_SPECIFIER_ID >> 8, p);
1004 put_unaligned_be32((IANA_SPECIFIER_ID & 0xff) << 24
1005 | sw_version, &p[4]);
1006
1007 /* We should not transmit if broadcast_channel.valid == 0. */
1008 fw_send_request(dev->card, &ptask->transaction,
1009 TCODE_STREAM_DATA,
1010 fw_stream_packet_destination_id(3,
1011 IEEE1394_BROADCAST_CHANNEL, 0),
1012 generation, SCODE_100, 0ULL, ptask->skb->data,
1013 tx_len + 8, fwnet_write_complete, ptask);
1014
1015 spin_lock_irqsave(&dev->lock, flags);
1016
1017 /* If the AT tasklet already ran, we may be last user. */
1018 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1019 if (!free)
1020 ptask->enqueued = true;
1021 else
1022 dec_queued_datagrams(dev);
1023
1024 spin_unlock_irqrestore(&dev->lock, flags);
1025
1026 goto out;
1027 }
1028
1029 fw_send_request(dev->card, &ptask->transaction,
1030 TCODE_WRITE_BLOCK_REQUEST, ptask->dest_node,
1031 ptask->generation, ptask->speed, ptask->fifo_addr,
1032 ptask->skb->data, tx_len, fwnet_write_complete, ptask);
1033
1034 spin_lock_irqsave(&dev->lock, flags);
1035
1036 /* If the AT tasklet already ran, we may be last user. */
1037 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1038 if (!free)
1039 ptask->enqueued = true;
1040 else
1041 dec_queued_datagrams(dev);
1042
1043 spin_unlock_irqrestore(&dev->lock, flags);
1044
1045 dev->netdev->trans_start = jiffies;
1046 out:
1047 if (free)
1048 fwnet_free_ptask(ptask);
1049
1050 return 0;
1051 }
1052
1053 static void fwnet_fifo_stop(struct fwnet_device *dev)
1054 {
1055 if (dev->local_fifo == FWNET_NO_FIFO_ADDR)
1056 return;
1057
1058 fw_core_remove_address_handler(&dev->handler);
1059 dev->local_fifo = FWNET_NO_FIFO_ADDR;
1060 }
1061
1062 static int fwnet_fifo_start(struct fwnet_device *dev)
1063 {
1064 int retval;
1065
1066 if (dev->local_fifo != FWNET_NO_FIFO_ADDR)
1067 return 0;
1068
1069 dev->handler.length = 4096;
1070 dev->handler.address_callback = fwnet_receive_packet;
1071 dev->handler.callback_data = dev;
1072
1073 retval = fw_core_add_address_handler(&dev->handler,
1074 &fw_high_memory_region);
1075 if (retval < 0)
1076 return retval;
1077
1078 dev->local_fifo = dev->handler.offset;
1079
1080 return 0;
1081 }
1082
1083 static void __fwnet_broadcast_stop(struct fwnet_device *dev)
1084 {
1085 unsigned u;
1086
1087 if (dev->broadcast_state != FWNET_BROADCAST_ERROR) {
1088 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++)
1089 kunmap(dev->broadcast_rcv_buffer.pages[u]);
1090 fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer, dev->card);
1091 }
1092 if (dev->broadcast_rcv_context) {
1093 fw_iso_context_destroy(dev->broadcast_rcv_context);
1094 dev->broadcast_rcv_context = NULL;
1095 }
1096 kfree(dev->broadcast_rcv_buffer_ptrs);
1097 dev->broadcast_rcv_buffer_ptrs = NULL;
1098 dev->broadcast_state = FWNET_BROADCAST_ERROR;
1099 }
1100
1101 static void fwnet_broadcast_stop(struct fwnet_device *dev)
1102 {
1103 if (dev->broadcast_state == FWNET_BROADCAST_ERROR)
1104 return;
1105 fw_iso_context_stop(dev->broadcast_rcv_context);
1106 __fwnet_broadcast_stop(dev);
1107 }
1108
1109 static int fwnet_broadcast_start(struct fwnet_device *dev)
1110 {
1111 struct fw_iso_context *context;
1112 int retval;
1113 unsigned num_packets;
1114 unsigned max_receive;
1115 struct fw_iso_packet packet;
1116 unsigned long offset;
1117 void **ptrptr;
1118 unsigned u;
1119
1120 if (dev->broadcast_state != FWNET_BROADCAST_ERROR)
1121 return 0;
1122
1123 max_receive = 1U << (dev->card->max_receive + 1);
1124 num_packets = (FWNET_ISO_PAGE_COUNT * PAGE_SIZE) / max_receive;
1125
1126 ptrptr = kmalloc(sizeof(void *) * num_packets, GFP_KERNEL);
1127 if (!ptrptr) {
1128 retval = -ENOMEM;
1129 goto failed;
1130 }
1131 dev->broadcast_rcv_buffer_ptrs = ptrptr;
1132
1133 context = fw_iso_context_create(dev->card, FW_ISO_CONTEXT_RECEIVE,
1134 IEEE1394_BROADCAST_CHANNEL,
1135 dev->card->link_speed, 8,
1136 fwnet_receive_broadcast, dev);
1137 if (IS_ERR(context)) {
1138 retval = PTR_ERR(context);
1139 goto failed;
1140 }
1141
1142 retval = fw_iso_buffer_init(&dev->broadcast_rcv_buffer, dev->card,
1143 FWNET_ISO_PAGE_COUNT, DMA_FROM_DEVICE);
1144 if (retval < 0)
1145 goto failed;
1146
1147 dev->broadcast_state = FWNET_BROADCAST_STOPPED;
1148
1149 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++) {
1150 void *ptr;
1151 unsigned v;
1152
1153 ptr = kmap(dev->broadcast_rcv_buffer.pages[u]);
1154 for (v = 0; v < num_packets / FWNET_ISO_PAGE_COUNT; v++)
1155 *ptrptr++ = (void *) ((char *)ptr + v * max_receive);
1156 }
1157 dev->broadcast_rcv_context = context;
1158
1159 packet.payload_length = max_receive;
1160 packet.interrupt = 1;
1161 packet.skip = 0;
1162 packet.tag = 3;
1163 packet.sy = 0;
1164 packet.header_length = IEEE1394_GASP_HDR_SIZE;
1165 offset = 0;
1166
1167 for (u = 0; u < num_packets; u++) {
1168 retval = fw_iso_context_queue(context, &packet,
1169 &dev->broadcast_rcv_buffer, offset);
1170 if (retval < 0)
1171 goto failed;
1172
1173 offset += max_receive;
1174 }
1175 dev->num_broadcast_rcv_ptrs = num_packets;
1176 dev->rcv_buffer_size = max_receive;
1177 dev->broadcast_rcv_next_ptr = 0U;
1178 retval = fw_iso_context_start(context, -1, 0,
1179 FW_ISO_CONTEXT_MATCH_ALL_TAGS); /* ??? sync */
1180 if (retval < 0)
1181 goto failed;
1182
1183 /* FIXME: adjust it according to the min. speed of all known peers? */
1184 dev->broadcast_xmt_max_payload = IEEE1394_MAX_PAYLOAD_S100
1185 - IEEE1394_GASP_HDR_SIZE - RFC2374_UNFRAG_HDR_SIZE;
1186 dev->broadcast_state = FWNET_BROADCAST_RUNNING;
1187
1188 return 0;
1189
1190 failed:
1191 __fwnet_broadcast_stop(dev);
1192 return retval;
1193 }
1194
1195 static void set_carrier_state(struct fwnet_device *dev)
1196 {
1197 if (dev->peer_count > 1)
1198 netif_carrier_on(dev->netdev);
1199 else
1200 netif_carrier_off(dev->netdev);
1201 }
1202
1203 /* ifup */
1204 static int fwnet_open(struct net_device *net)
1205 {
1206 struct fwnet_device *dev = netdev_priv(net);
1207 int ret;
1208
1209 ret = fwnet_broadcast_start(dev);
1210 if (ret)
1211 return ret;
1212
1213 netif_start_queue(net);
1214
1215 spin_lock_irq(&dev->lock);
1216 set_carrier_state(dev);
1217 spin_unlock_irq(&dev->lock);
1218
1219 return 0;
1220 }
1221
1222 /* ifdown */
1223 static int fwnet_stop(struct net_device *net)
1224 {
1225 struct fwnet_device *dev = netdev_priv(net);
1226
1227 netif_stop_queue(net);
1228 fwnet_broadcast_stop(dev);
1229
1230 return 0;
1231 }
1232
1233 static netdev_tx_t fwnet_tx(struct sk_buff *skb, struct net_device *net)
1234 {
1235 struct fwnet_header hdr_buf;
1236 struct fwnet_device *dev = netdev_priv(net);
1237 __be16 proto;
1238 u16 dest_node;
1239 unsigned max_payload;
1240 u16 dg_size;
1241 u16 *datagram_label_ptr;
1242 struct fwnet_packet_task *ptask;
1243 struct fwnet_peer *peer;
1244 unsigned long flags;
1245
1246 spin_lock_irqsave(&dev->lock, flags);
1247
1248 /* Can this happen? */
1249 if (netif_queue_stopped(dev->netdev)) {
1250 spin_unlock_irqrestore(&dev->lock, flags);
1251
1252 return NETDEV_TX_BUSY;
1253 }
1254
1255 ptask = kmem_cache_alloc(fwnet_packet_task_cache, GFP_ATOMIC);
1256 if (ptask == NULL)
1257 goto fail;
1258
1259 skb = skb_share_check(skb, GFP_ATOMIC);
1260 if (!skb)
1261 goto fail;
1262
1263 /*
1264 * Make a copy of the driver-specific header.
1265 * We might need to rebuild the header on tx failure.
1266 */
1267 memcpy(&hdr_buf, skb->data, sizeof(hdr_buf));
1268 proto = hdr_buf.h_proto;
1269
1270 switch (proto) {
1271 case htons(ETH_P_ARP):
1272 case htons(ETH_P_IP):
1273 #if IS_ENABLED(CONFIG_IPV6)
1274 case htons(ETH_P_IPV6):
1275 #endif
1276 break;
1277 default:
1278 goto fail;
1279 }
1280
1281 skb_pull(skb, sizeof(hdr_buf));
1282 dg_size = skb->len;
1283
1284 /*
1285 * Set the transmission type for the packet. ARP packets and IP
1286 * broadcast packets are sent via GASP.
1287 */
1288 if (fwnet_hwaddr_is_multicast(hdr_buf.h_dest)) {
1289 max_payload = dev->broadcast_xmt_max_payload;
1290 datagram_label_ptr = &dev->broadcast_xmt_datagramlabel;
1291
1292 ptask->fifo_addr = FWNET_NO_FIFO_ADDR;
1293 ptask->generation = 0;
1294 ptask->dest_node = IEEE1394_ALL_NODES;
1295 ptask->speed = SCODE_100;
1296 } else {
1297 union fwnet_hwaddr *ha = (union fwnet_hwaddr *)hdr_buf.h_dest;
1298 __be64 guid = get_unaligned(&ha->uc.uniq_id);
1299 u8 generation;
1300
1301 peer = fwnet_peer_find_by_guid(dev, be64_to_cpu(guid));
1302 if (!peer)
1303 goto fail;
1304
1305 generation = peer->generation;
1306 dest_node = peer->node_id;
1307 max_payload = peer->max_payload;
1308 datagram_label_ptr = &peer->datagram_label;
1309
1310 ptask->fifo_addr = fwnet_hwaddr_fifo(ha);
1311 ptask->generation = generation;
1312 ptask->dest_node = dest_node;
1313 ptask->speed = peer->speed;
1314 }
1315
1316 ptask->hdr.w0 = 0;
1317 ptask->hdr.w1 = 0;
1318 ptask->skb = skb;
1319 ptask->dev = dev;
1320
1321 /* Does it all fit in one packet? */
1322 if (dg_size <= max_payload) {
1323 fwnet_make_uf_hdr(&ptask->hdr, ntohs(proto));
1324 ptask->outstanding_pkts = 1;
1325 max_payload = dg_size + RFC2374_UNFRAG_HDR_SIZE;
1326 } else {
1327 u16 datagram_label;
1328
1329 max_payload -= RFC2374_FRAG_OVERHEAD;
1330 datagram_label = (*datagram_label_ptr)++;
1331 fwnet_make_ff_hdr(&ptask->hdr, ntohs(proto), dg_size,
1332 datagram_label);
1333 ptask->outstanding_pkts = DIV_ROUND_UP(dg_size, max_payload);
1334 max_payload += RFC2374_FRAG_HDR_SIZE;
1335 }
1336
1337 if (++dev->queued_datagrams == FWNET_MAX_QUEUED_DATAGRAMS)
1338 netif_stop_queue(dev->netdev);
1339
1340 spin_unlock_irqrestore(&dev->lock, flags);
1341
1342 ptask->max_payload = max_payload;
1343 ptask->enqueued = 0;
1344
1345 fwnet_send_packet(ptask);
1346
1347 return NETDEV_TX_OK;
1348
1349 fail:
1350 spin_unlock_irqrestore(&dev->lock, flags);
1351
1352 if (ptask)
1353 kmem_cache_free(fwnet_packet_task_cache, ptask);
1354
1355 if (skb != NULL)
1356 dev_kfree_skb(skb);
1357
1358 net->stats.tx_dropped++;
1359 net->stats.tx_errors++;
1360
1361 /*
1362 * FIXME: According to a patch from 2003-02-26, "returning non-zero
1363 * causes serious problems" here, allegedly. Before that patch,
1364 * -ERRNO was returned which is not appropriate under Linux 2.6.
1365 * Perhaps more needs to be done? Stop the queue in serious
1366 * conditions and restart it elsewhere?
1367 */
1368 return NETDEV_TX_OK;
1369 }
1370
1371 static int fwnet_change_mtu(struct net_device *net, int new_mtu)
1372 {
1373 if (new_mtu < 68)
1374 return -EINVAL;
1375
1376 net->mtu = new_mtu;
1377 return 0;
1378 }
1379
1380 static const struct ethtool_ops fwnet_ethtool_ops = {
1381 .get_link = ethtool_op_get_link,
1382 };
1383
1384 static const struct net_device_ops fwnet_netdev_ops = {
1385 .ndo_open = fwnet_open,
1386 .ndo_stop = fwnet_stop,
1387 .ndo_start_xmit = fwnet_tx,
1388 .ndo_change_mtu = fwnet_change_mtu,
1389 };
1390
1391 static void fwnet_init_dev(struct net_device *net)
1392 {
1393 net->header_ops = &fwnet_header_ops;
1394 net->netdev_ops = &fwnet_netdev_ops;
1395 net->watchdog_timeo = 2 * HZ;
1396 net->flags = IFF_BROADCAST | IFF_MULTICAST;
1397 net->features = NETIF_F_HIGHDMA;
1398 net->addr_len = FWNET_ALEN;
1399 net->hard_header_len = FWNET_HLEN;
1400 net->type = ARPHRD_IEEE1394;
1401 net->tx_queue_len = FWNET_TX_QUEUE_LEN;
1402 net->ethtool_ops = &fwnet_ethtool_ops;
1403 }
1404
1405 /* caller must hold fwnet_device_mutex */
1406 static struct fwnet_device *fwnet_dev_find(struct fw_card *card)
1407 {
1408 struct fwnet_device *dev;
1409
1410 list_for_each_entry(dev, &fwnet_device_list, dev_link)
1411 if (dev->card == card)
1412 return dev;
1413
1414 return NULL;
1415 }
1416
1417 static int fwnet_add_peer(struct fwnet_device *dev,
1418 struct fw_unit *unit, struct fw_device *device)
1419 {
1420 struct fwnet_peer *peer;
1421
1422 peer = kmalloc(sizeof(*peer), GFP_KERNEL);
1423 if (!peer)
1424 return -ENOMEM;
1425
1426 dev_set_drvdata(&unit->device, peer);
1427
1428 peer->dev = dev;
1429 peer->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4];
1430 INIT_LIST_HEAD(&peer->pd_list);
1431 peer->pdg_size = 0;
1432 peer->datagram_label = 0;
1433 peer->speed = device->max_speed;
1434 peer->max_payload = fwnet_max_payload(device->max_rec, peer->speed);
1435
1436 peer->generation = device->generation;
1437 smp_rmb();
1438 peer->node_id = device->node_id;
1439
1440 spin_lock_irq(&dev->lock);
1441 list_add_tail(&peer->peer_link, &dev->peer_list);
1442 dev->peer_count++;
1443 set_carrier_state(dev);
1444 spin_unlock_irq(&dev->lock);
1445
1446 return 0;
1447 }
1448
1449 static int fwnet_probe(struct fw_unit *unit,
1450 const struct ieee1394_device_id *id)
1451 {
1452 struct fw_device *device = fw_parent_device(unit);
1453 struct fw_card *card = device->card;
1454 struct net_device *net;
1455 bool allocated_netdev = false;
1456 struct fwnet_device *dev;
1457 unsigned max_mtu;
1458 int ret;
1459 union fwnet_hwaddr *ha;
1460
1461 mutex_lock(&fwnet_device_mutex);
1462
1463 dev = fwnet_dev_find(card);
1464 if (dev) {
1465 net = dev->netdev;
1466 goto have_dev;
1467 }
1468
1469 net = alloc_netdev(sizeof(*dev), "firewire%d", NET_NAME_UNKNOWN,
1470 fwnet_init_dev);
1471 if (net == NULL) {
1472 mutex_unlock(&fwnet_device_mutex);
1473 return -ENOMEM;
1474 }
1475
1476 allocated_netdev = true;
1477 SET_NETDEV_DEV(net, card->device);
1478 dev = netdev_priv(net);
1479
1480 spin_lock_init(&dev->lock);
1481 dev->broadcast_state = FWNET_BROADCAST_ERROR;
1482 dev->broadcast_rcv_context = NULL;
1483 dev->broadcast_xmt_max_payload = 0;
1484 dev->broadcast_xmt_datagramlabel = 0;
1485 dev->local_fifo = FWNET_NO_FIFO_ADDR;
1486 dev->queued_datagrams = 0;
1487 INIT_LIST_HEAD(&dev->peer_list);
1488 dev->card = card;
1489 dev->netdev = net;
1490
1491 ret = fwnet_fifo_start(dev);
1492 if (ret < 0)
1493 goto out;
1494 dev->local_fifo = dev->handler.offset;
1495
1496 /*
1497 * Use the RFC 2734 default 1500 octets or the maximum payload
1498 * as initial MTU
1499 */
1500 max_mtu = (1 << (card->max_receive + 1))
1501 - sizeof(struct rfc2734_header) - IEEE1394_GASP_HDR_SIZE;
1502 net->mtu = min(1500U, max_mtu);
1503
1504 /* Set our hardware address while we're at it */
1505 ha = (union fwnet_hwaddr *)net->dev_addr;
1506 put_unaligned_be64(card->guid, &ha->uc.uniq_id);
1507 ha->uc.max_rec = dev->card->max_receive;
1508 ha->uc.sspd = dev->card->link_speed;
1509 put_unaligned_be16(dev->local_fifo >> 32, &ha->uc.fifo_hi);
1510 put_unaligned_be32(dev->local_fifo & 0xffffffff, &ha->uc.fifo_lo);
1511
1512 memset(net->broadcast, -1, net->addr_len);
1513
1514 ret = register_netdev(net);
1515 if (ret)
1516 goto out;
1517
1518 list_add_tail(&dev->dev_link, &fwnet_device_list);
1519 dev_notice(&net->dev, "IP over IEEE 1394 on card %s\n",
1520 dev_name(card->device));
1521 have_dev:
1522 ret = fwnet_add_peer(dev, unit, device);
1523 if (ret && allocated_netdev) {
1524 unregister_netdev(net);
1525 list_del(&dev->dev_link);
1526 out:
1527 fwnet_fifo_stop(dev);
1528 free_netdev(net);
1529 }
1530
1531 mutex_unlock(&fwnet_device_mutex);
1532
1533 return ret;
1534 }
1535
1536 /*
1537 * FIXME abort partially sent fragmented datagrams,
1538 * discard partially received fragmented datagrams
1539 */
1540 static void fwnet_update(struct fw_unit *unit)
1541 {
1542 struct fw_device *device = fw_parent_device(unit);
1543 struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1544 int generation;
1545
1546 generation = device->generation;
1547
1548 spin_lock_irq(&peer->dev->lock);
1549 peer->node_id = device->node_id;
1550 peer->generation = generation;
1551 spin_unlock_irq(&peer->dev->lock);
1552 }
1553
1554 static void fwnet_remove_peer(struct fwnet_peer *peer, struct fwnet_device *dev)
1555 {
1556 struct fwnet_partial_datagram *pd, *pd_next;
1557
1558 spin_lock_irq(&dev->lock);
1559 list_del(&peer->peer_link);
1560 dev->peer_count--;
1561 set_carrier_state(dev);
1562 spin_unlock_irq(&dev->lock);
1563
1564 list_for_each_entry_safe(pd, pd_next, &peer->pd_list, pd_link)
1565 fwnet_pd_delete(pd);
1566
1567 kfree(peer);
1568 }
1569
1570 static void fwnet_remove(struct fw_unit *unit)
1571 {
1572 struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1573 struct fwnet_device *dev = peer->dev;
1574 struct net_device *net;
1575 int i;
1576
1577 mutex_lock(&fwnet_device_mutex);
1578
1579 net = dev->netdev;
1580
1581 fwnet_remove_peer(peer, dev);
1582
1583 if (list_empty(&dev->peer_list)) {
1584 unregister_netdev(net);
1585
1586 fwnet_fifo_stop(dev);
1587
1588 for (i = 0; dev->queued_datagrams && i < 5; i++)
1589 ssleep(1);
1590 WARN_ON(dev->queued_datagrams);
1591 list_del(&dev->dev_link);
1592
1593 free_netdev(net);
1594 }
1595
1596 mutex_unlock(&fwnet_device_mutex);
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 #if IS_ENABLED(CONFIG_IPV6)
1607 {
1608 .match_flags = IEEE1394_MATCH_SPECIFIER_ID |
1609 IEEE1394_MATCH_VERSION,
1610 .specifier_id = IANA_SPECIFIER_ID,
1611 .version = RFC3146_SW_VERSION,
1612 },
1613 #endif
1614 { }
1615 };
1616
1617 static struct fw_driver fwnet_driver = {
1618 .driver = {
1619 .owner = THIS_MODULE,
1620 .name = KBUILD_MODNAME,
1621 .bus = &fw_bus_type,
1622 },
1623 .probe = fwnet_probe,
1624 .update = fwnet_update,
1625 .remove = fwnet_remove,
1626 .id_table = fwnet_id_table,
1627 };
1628
1629 static const u32 rfc2374_unit_directory_data[] = {
1630 0x00040000, /* directory_length */
1631 0x1200005e, /* unit_specifier_id: IANA */
1632 0x81000003, /* textual descriptor offset */
1633 0x13000001, /* unit_sw_version: RFC 2734 */
1634 0x81000005, /* textual descriptor offset */
1635 0x00030000, /* descriptor_length */
1636 0x00000000, /* text */
1637 0x00000000, /* minimal ASCII, en */
1638 0x49414e41, /* I A N A */
1639 0x00030000, /* descriptor_length */
1640 0x00000000, /* text */
1641 0x00000000, /* minimal ASCII, en */
1642 0x49507634, /* I P v 4 */
1643 };
1644
1645 static struct fw_descriptor rfc2374_unit_directory = {
1646 .length = ARRAY_SIZE(rfc2374_unit_directory_data),
1647 .key = (CSR_DIRECTORY | CSR_UNIT) << 24,
1648 .data = rfc2374_unit_directory_data
1649 };
1650
1651 #if IS_ENABLED(CONFIG_IPV6)
1652 static const u32 rfc3146_unit_directory_data[] = {
1653 0x00040000, /* directory_length */
1654 0x1200005e, /* unit_specifier_id: IANA */
1655 0x81000003, /* textual descriptor offset */
1656 0x13000002, /* unit_sw_version: RFC 3146 */
1657 0x81000005, /* textual descriptor offset */
1658 0x00030000, /* descriptor_length */
1659 0x00000000, /* text */
1660 0x00000000, /* minimal ASCII, en */
1661 0x49414e41, /* I A N A */
1662 0x00030000, /* descriptor_length */
1663 0x00000000, /* text */
1664 0x00000000, /* minimal ASCII, en */
1665 0x49507636, /* I P v 6 */
1666 };
1667
1668 static struct fw_descriptor rfc3146_unit_directory = {
1669 .length = ARRAY_SIZE(rfc3146_unit_directory_data),
1670 .key = (CSR_DIRECTORY | CSR_UNIT) << 24,
1671 .data = rfc3146_unit_directory_data
1672 };
1673 #endif
1674
1675 static int __init fwnet_init(void)
1676 {
1677 int err;
1678
1679 err = fw_core_add_descriptor(&rfc2374_unit_directory);
1680 if (err)
1681 return err;
1682
1683 #if IS_ENABLED(CONFIG_IPV6)
1684 err = fw_core_add_descriptor(&rfc3146_unit_directory);
1685 if (err)
1686 goto out;
1687 #endif
1688
1689 fwnet_packet_task_cache = kmem_cache_create("packet_task",
1690 sizeof(struct fwnet_packet_task), 0, 0, NULL);
1691 if (!fwnet_packet_task_cache) {
1692 err = -ENOMEM;
1693 goto out2;
1694 }
1695
1696 err = driver_register(&fwnet_driver.driver);
1697 if (!err)
1698 return 0;
1699
1700 kmem_cache_destroy(fwnet_packet_task_cache);
1701 out2:
1702 #if IS_ENABLED(CONFIG_IPV6)
1703 fw_core_remove_descriptor(&rfc3146_unit_directory);
1704 out:
1705 #endif
1706 fw_core_remove_descriptor(&rfc2374_unit_directory);
1707
1708 return err;
1709 }
1710 module_init(fwnet_init);
1711
1712 static void __exit fwnet_cleanup(void)
1713 {
1714 driver_unregister(&fwnet_driver.driver);
1715 kmem_cache_destroy(fwnet_packet_task_cache);
1716 #if IS_ENABLED(CONFIG_IPV6)
1717 fw_core_remove_descriptor(&rfc3146_unit_directory);
1718 #endif
1719 fw_core_remove_descriptor(&rfc2374_unit_directory);
1720 }
1721 module_exit(fwnet_cleanup);
1722
1723 MODULE_AUTHOR("Jay Fenlason <fenlason@redhat.com>");
1724 MODULE_DESCRIPTION("IP over IEEE1394 as per RFC 2734/3146");
1725 MODULE_LICENSE("GPL");
1726 MODULE_DEVICE_TABLE(ieee1394, fwnet_id_table);
Linux with added FPC-III support