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Linux 4.19.133
[linux/fpc-iii.git] / drivers / firewire / net.c
blobbbabfca812bbcd80698bfcd9f91ab8a992c864df
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 = 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
253 /* Pairs with the READ_ONCE() in neigh_resolve_output(),
254 * neigh_hh_output() and neigh_update_hhs().
255 */
256 smp_store_release(&hh->hh_len, FWNET_HLEN);
257
258 return 0;
259 }
260
261 /* Called by Address Resolution module to notify changes in address. */
262 static void fwnet_header_cache_update(struct hh_cache *hh,
263 const struct net_device *net, const unsigned char *haddr)
264 {
265 memcpy((u8 *)hh->hh_data + HH_DATA_OFF(FWNET_HLEN), haddr, net->addr_len);
266 }
267
268 static int fwnet_header_parse(const struct sk_buff *skb, unsigned char *haddr)
269 {
270 memcpy(haddr, skb->dev->dev_addr, FWNET_ALEN);
271
272 return FWNET_ALEN;
273 }
274
275 static const struct header_ops fwnet_header_ops = {
276 .create = fwnet_header_create,
277 .cache = fwnet_header_cache,
278 .cache_update = fwnet_header_cache_update,
279 .parse = fwnet_header_parse,
280 };
281
282 /* FIXME: is this correct for all cases? */
283 static bool fwnet_frag_overlap(struct fwnet_partial_datagram *pd,
284 unsigned offset, unsigned len)
285 {
286 struct fwnet_fragment_info *fi;
287 unsigned end = offset + len;
288
289 list_for_each_entry(fi, &pd->fi_list, fi_link)
290 if (offset < fi->offset + fi->len && end > fi->offset)
291 return true;
292
293 return false;
294 }
295
296 /* Assumes that new fragment does not overlap any existing fragments */
297 static struct fwnet_fragment_info *fwnet_frag_new(
298 struct fwnet_partial_datagram *pd, unsigned offset, unsigned len)
299 {
300 struct fwnet_fragment_info *fi, *fi2, *new;
301 struct list_head *list;
302
303 list = &pd->fi_list;
304 list_for_each_entry(fi, &pd->fi_list, fi_link) {
305 if (fi->offset + fi->len == offset) {
306 /* The new fragment can be tacked on to the end */
307 /* Did the new fragment plug a hole? */
308 fi2 = list_entry(fi->fi_link.next,
309 struct fwnet_fragment_info, fi_link);
310 if (fi->offset + fi->len == fi2->offset) {
311 /* glue fragments together */
312 fi->len += len + fi2->len;
313 list_del(&fi2->fi_link);
314 kfree(fi2);
315 } else {
316 fi->len += len;
317 }
318
319 return fi;
320 }
321 if (offset + len == fi->offset) {
322 /* The new fragment can be tacked on to the beginning */
323 /* Did the new fragment plug a hole? */
324 fi2 = list_entry(fi->fi_link.prev,
325 struct fwnet_fragment_info, fi_link);
326 if (fi2->offset + fi2->len == fi->offset) {
327 /* glue fragments together */
328 fi2->len += fi->len + len;
329 list_del(&fi->fi_link);
330 kfree(fi);
331
332 return fi2;
333 }
334 fi->offset = offset;
335 fi->len += len;
336
337 return fi;
338 }
339 if (offset > fi->offset + fi->len) {
340 list = &fi->fi_link;
341 break;
342 }
343 if (offset + len < fi->offset) {
344 list = fi->fi_link.prev;
345 break;
346 }
347 }
348
349 new = kmalloc(sizeof(*new), GFP_ATOMIC);
350 if (!new)
351 return NULL;
352
353 new->offset = offset;
354 new->len = len;
355 list_add(&new->fi_link, list);
356
357 return new;
358 }
359
360 static struct fwnet_partial_datagram *fwnet_pd_new(struct net_device *net,
361 struct fwnet_peer *peer, u16 datagram_label, unsigned dg_size,
362 void *frag_buf, unsigned frag_off, unsigned frag_len)
363 {
364 struct fwnet_partial_datagram *new;
365 struct fwnet_fragment_info *fi;
366
367 new = kmalloc(sizeof(*new), GFP_ATOMIC);
368 if (!new)
369 goto fail;
370
371 INIT_LIST_HEAD(&new->fi_list);
372 fi = fwnet_frag_new(new, frag_off, frag_len);
373 if (fi == NULL)
374 goto fail_w_new;
375
376 new->datagram_label = datagram_label;
377 new->datagram_size = dg_size;
378 new->skb = dev_alloc_skb(dg_size + LL_RESERVED_SPACE(net));
379 if (new->skb == NULL)
380 goto fail_w_fi;
381
382 skb_reserve(new->skb, LL_RESERVED_SPACE(net));
383 new->pbuf = skb_put(new->skb, dg_size);
384 memcpy(new->pbuf + frag_off, frag_buf, frag_len);
385 list_add_tail(&new->pd_link, &peer->pd_list);
386
387 return new;
388
389 fail_w_fi:
390 kfree(fi);
391 fail_w_new:
392 kfree(new);
393 fail:
394 return NULL;
395 }
396
397 static struct fwnet_partial_datagram *fwnet_pd_find(struct fwnet_peer *peer,
398 u16 datagram_label)
399 {
400 struct fwnet_partial_datagram *pd;
401
402 list_for_each_entry(pd, &peer->pd_list, pd_link)
403 if (pd->datagram_label == datagram_label)
404 return pd;
405
406 return NULL;
407 }
408
409
410 static void fwnet_pd_delete(struct fwnet_partial_datagram *old)
411 {
412 struct fwnet_fragment_info *fi, *n;
413
414 list_for_each_entry_safe(fi, n, &old->fi_list, fi_link)
415 kfree(fi);
416
417 list_del(&old->pd_link);
418 dev_kfree_skb_any(old->skb);
419 kfree(old);
420 }
421
422 static bool fwnet_pd_update(struct fwnet_peer *peer,
423 struct fwnet_partial_datagram *pd, void *frag_buf,
424 unsigned frag_off, unsigned frag_len)
425 {
426 if (fwnet_frag_new(pd, frag_off, frag_len) == NULL)
427 return false;
428
429 memcpy(pd->pbuf + frag_off, frag_buf, frag_len);
430
431 /*
432 * Move list entry to beginning of list so that oldest partial
433 * datagrams percolate to the end of the list
434 */
435 list_move_tail(&pd->pd_link, &peer->pd_list);
436
437 return true;
438 }
439
440 static bool fwnet_pd_is_complete(struct fwnet_partial_datagram *pd)
441 {
442 struct fwnet_fragment_info *fi;
443
444 fi = list_entry(pd->fi_list.next, struct fwnet_fragment_info, fi_link);
445
446 return fi->len == pd->datagram_size;
447 }
448
449 /* caller must hold dev->lock */
450 static struct fwnet_peer *fwnet_peer_find_by_guid(struct fwnet_device *dev,
451 u64 guid)
452 {
453 struct fwnet_peer *peer;
454
455 list_for_each_entry(peer, &dev->peer_list, peer_link)
456 if (peer->guid == guid)
457 return peer;
458
459 return NULL;
460 }
461
462 /* caller must hold dev->lock */
463 static struct fwnet_peer *fwnet_peer_find_by_node_id(struct fwnet_device *dev,
464 int node_id, int generation)
465 {
466 struct fwnet_peer *peer;
467
468 list_for_each_entry(peer, &dev->peer_list, peer_link)
469 if (peer->node_id == node_id &&
470 peer->generation == generation)
471 return peer;
472
473 return NULL;
474 }
475
476 /* See IEEE 1394-2008 table 6-4, table 8-8, table 16-18. */
477 static unsigned fwnet_max_payload(unsigned max_rec, unsigned speed)
478 {
479 max_rec = min(max_rec, speed + 8);
480 max_rec = clamp(max_rec, 8U, 11U); /* 512...4096 */
481
482 return (1 << (max_rec + 1)) - RFC2374_FRAG_HDR_SIZE;
483 }
484
485
486 static int fwnet_finish_incoming_packet(struct net_device *net,
487 struct sk_buff *skb, u16 source_node_id,
488 bool is_broadcast, u16 ether_type)
489 {
490 struct fwnet_device *dev;
491 int status;
492 __be64 guid;
493
494 switch (ether_type) {
495 case ETH_P_ARP:
496 case ETH_P_IP:
497 #if IS_ENABLED(CONFIG_IPV6)
498 case ETH_P_IPV6:
499 #endif
500 break;
501 default:
502 goto err;
503 }
504
505 dev = netdev_priv(net);
506 /* Write metadata, and then pass to the receive level */
507 skb->dev = net;
508 skb->ip_summed = CHECKSUM_NONE;
509
510 /*
511 * Parse the encapsulation header. This actually does the job of
512 * converting to an ethernet-like pseudo frame header.
513 */
514 guid = cpu_to_be64(dev->card->guid);
515 if (dev_hard_header(skb, net, ether_type,
516 is_broadcast ? net->broadcast : net->dev_addr,
517 NULL, skb->len) >= 0) {
518 struct fwnet_header *eth;
519 u16 *rawp;
520 __be16 protocol;
521
522 skb_reset_mac_header(skb);
523 skb_pull(skb, sizeof(*eth));
524 eth = (struct fwnet_header *)skb_mac_header(skb);
525 if (fwnet_hwaddr_is_multicast(eth->h_dest)) {
526 if (memcmp(eth->h_dest, net->broadcast,
527 net->addr_len) == 0)
528 skb->pkt_type = PACKET_BROADCAST;
529 #if 0
530 else
531 skb->pkt_type = PACKET_MULTICAST;
532 #endif
533 } else {
534 if (memcmp(eth->h_dest, net->dev_addr, net->addr_len))
535 skb->pkt_type = PACKET_OTHERHOST;
536 }
537 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN) {
538 protocol = eth->h_proto;
539 } else {
540 rawp = (u16 *)skb->data;
541 if (*rawp == 0xffff)
542 protocol = htons(ETH_P_802_3);
543 else
544 protocol = htons(ETH_P_802_2);
545 }
546 skb->protocol = protocol;
547 }
548 status = netif_rx(skb);
549 if (status == NET_RX_DROP) {
550 net->stats.rx_errors++;
551 net->stats.rx_dropped++;
552 } else {
553 net->stats.rx_packets++;
554 net->stats.rx_bytes += skb->len;
555 }
556
557 return 0;
558
559 err:
560 net->stats.rx_errors++;
561 net->stats.rx_dropped++;
562
563 dev_kfree_skb_any(skb);
564
565 return -ENOENT;
566 }
567
568 static int fwnet_incoming_packet(struct fwnet_device *dev, __be32 *buf, int len,
569 int source_node_id, int generation,
570 bool is_broadcast)
571 {
572 struct sk_buff *skb;
573 struct net_device *net = dev->netdev;
574 struct rfc2734_header hdr;
575 unsigned lf;
576 unsigned long flags;
577 struct fwnet_peer *peer;
578 struct fwnet_partial_datagram *pd;
579 int fg_off;
580 int dg_size;
581 u16 datagram_label;
582 int retval;
583 u16 ether_type;
584
585 if (len <= RFC2374_UNFRAG_HDR_SIZE)
586 return 0;
587
588 hdr.w0 = be32_to_cpu(buf[0]);
589 lf = fwnet_get_hdr_lf(&hdr);
590 if (lf == RFC2374_HDR_UNFRAG) {
591 /*
592 * An unfragmented datagram has been received by the ieee1394
593 * bus. Build an skbuff around it so we can pass it to the
594 * high level network layer.
595 */
596 ether_type = fwnet_get_hdr_ether_type(&hdr);
597 buf++;
598 len -= RFC2374_UNFRAG_HDR_SIZE;
599
600 skb = dev_alloc_skb(len + LL_RESERVED_SPACE(net));
601 if (unlikely(!skb)) {
602 net->stats.rx_dropped++;
603
604 return -ENOMEM;
605 }
606 skb_reserve(skb, LL_RESERVED_SPACE(net));
607 skb_put_data(skb, buf, len);
608
609 return fwnet_finish_incoming_packet(net, skb, source_node_id,
610 is_broadcast, ether_type);
611 }
612
613 /* A datagram fragment has been received, now the fun begins. */
614
615 if (len <= RFC2374_FRAG_HDR_SIZE)
616 return 0;
617
618 hdr.w1 = ntohl(buf[1]);
619 buf += 2;
620 len -= RFC2374_FRAG_HDR_SIZE;
621 if (lf == RFC2374_HDR_FIRSTFRAG) {
622 ether_type = fwnet_get_hdr_ether_type(&hdr);
623 fg_off = 0;
624 } else {
625 ether_type = 0;
626 fg_off = fwnet_get_hdr_fg_off(&hdr);
627 }
628 datagram_label = fwnet_get_hdr_dgl(&hdr);
629 dg_size = fwnet_get_hdr_dg_size(&hdr);
630
631 if (fg_off + len > dg_size)
632 return 0;
633
634 spin_lock_irqsave(&dev->lock, flags);
635
636 peer = fwnet_peer_find_by_node_id(dev, source_node_id, generation);
637 if (!peer) {
638 retval = -ENOENT;
639 goto fail;
640 }
641
642 pd = fwnet_pd_find(peer, datagram_label);
643 if (pd == NULL) {
644 while (peer->pdg_size >= FWNET_MAX_FRAGMENTS) {
645 /* remove the oldest */
646 fwnet_pd_delete(list_first_entry(&peer->pd_list,
647 struct fwnet_partial_datagram, pd_link));
648 peer->pdg_size--;
649 }
650 pd = fwnet_pd_new(net, peer, datagram_label,
651 dg_size, buf, fg_off, len);
652 if (pd == NULL) {
653 retval = -ENOMEM;
654 goto fail;
655 }
656 peer->pdg_size++;
657 } else {
658 if (fwnet_frag_overlap(pd, fg_off, len) ||
659 pd->datagram_size != dg_size) {
660 /*
661 * Differing datagram sizes or overlapping fragments,
662 * discard old datagram and start a new one.
663 */
664 fwnet_pd_delete(pd);
665 pd = fwnet_pd_new(net, peer, datagram_label,
666 dg_size, buf, fg_off, len);
667 if (pd == NULL) {
668 peer->pdg_size--;
669 retval = -ENOMEM;
670 goto fail;
671 }
672 } else {
673 if (!fwnet_pd_update(peer, pd, buf, fg_off, len)) {
674 /*
675 * Couldn't save off fragment anyway
676 * so might as well obliterate the
677 * datagram now.
678 */
679 fwnet_pd_delete(pd);
680 peer->pdg_size--;
681 retval = -ENOMEM;
682 goto fail;
683 }
684 }
685 } /* new datagram or add to existing one */
686
687 if (lf == RFC2374_HDR_FIRSTFRAG)
688 pd->ether_type = ether_type;
689
690 if (fwnet_pd_is_complete(pd)) {
691 ether_type = pd->ether_type;
692 peer->pdg_size--;
693 skb = skb_get(pd->skb);
694 fwnet_pd_delete(pd);
695
696 spin_unlock_irqrestore(&dev->lock, flags);
697
698 return fwnet_finish_incoming_packet(net, skb, source_node_id,
699 false, ether_type);
700 }
701 /*
702 * Datagram is not complete, we're done for the
703 * moment.
704 */
705 retval = 0;
706 fail:
707 spin_unlock_irqrestore(&dev->lock, flags);
708
709 return retval;
710 }
711
712 static void fwnet_receive_packet(struct fw_card *card, struct fw_request *r,
713 int tcode, int destination, int source, int generation,
714 unsigned long long offset, void *payload, size_t length,
715 void *callback_data)
716 {
717 struct fwnet_device *dev = callback_data;
718 int rcode;
719
720 if (destination == IEEE1394_ALL_NODES) {
721 kfree(r);
722
723 return;
724 }
725
726 if (offset != dev->handler.offset)
727 rcode = RCODE_ADDRESS_ERROR;
728 else if (tcode != TCODE_WRITE_BLOCK_REQUEST)
729 rcode = RCODE_TYPE_ERROR;
730 else if (fwnet_incoming_packet(dev, payload, length,
731 source, generation, false) != 0) {
732 dev_err(&dev->netdev->dev, "incoming packet failure\n");
733 rcode = RCODE_CONFLICT_ERROR;
734 } else
735 rcode = RCODE_COMPLETE;
736
737 fw_send_response(card, r, rcode);
738 }
739
740 static int gasp_source_id(__be32 *p)
741 {
742 return be32_to_cpu(p[0]) >> 16;
743 }
744
745 static u32 gasp_specifier_id(__be32 *p)
746 {
747 return (be32_to_cpu(p[0]) & 0xffff) << 8 |
748 (be32_to_cpu(p[1]) & 0xff000000) >> 24;
749 }
750
751 static u32 gasp_version(__be32 *p)
752 {
753 return be32_to_cpu(p[1]) & 0xffffff;
754 }
755
756 static void fwnet_receive_broadcast(struct fw_iso_context *context,
757 u32 cycle, size_t header_length, void *header, void *data)
758 {
759 struct fwnet_device *dev;
760 struct fw_iso_packet packet;
761 __be16 *hdr_ptr;
762 __be32 *buf_ptr;
763 int retval;
764 u32 length;
765 unsigned long offset;
766 unsigned long flags;
767
768 dev = data;
769 hdr_ptr = header;
770 length = be16_to_cpup(hdr_ptr);
771
772 spin_lock_irqsave(&dev->lock, flags);
773
774 offset = dev->rcv_buffer_size * dev->broadcast_rcv_next_ptr;
775 buf_ptr = dev->broadcast_rcv_buffer_ptrs[dev->broadcast_rcv_next_ptr++];
776 if (dev->broadcast_rcv_next_ptr == dev->num_broadcast_rcv_ptrs)
777 dev->broadcast_rcv_next_ptr = 0;
778
779 spin_unlock_irqrestore(&dev->lock, flags);
780
781 if (length > IEEE1394_GASP_HDR_SIZE &&
782 gasp_specifier_id(buf_ptr) == IANA_SPECIFIER_ID &&
783 (gasp_version(buf_ptr) == RFC2734_SW_VERSION
784 #if IS_ENABLED(CONFIG_IPV6)
785 || gasp_version(buf_ptr) == RFC3146_SW_VERSION
786 #endif
787 ))
788 fwnet_incoming_packet(dev, buf_ptr + 2,
789 length - IEEE1394_GASP_HDR_SIZE,
790 gasp_source_id(buf_ptr),
791 context->card->generation, true);
792
793 packet.payload_length = dev->rcv_buffer_size;
794 packet.interrupt = 1;
795 packet.skip = 0;
796 packet.tag = 3;
797 packet.sy = 0;
798 packet.header_length = IEEE1394_GASP_HDR_SIZE;
799
800 spin_lock_irqsave(&dev->lock, flags);
801
802 retval = fw_iso_context_queue(dev->broadcast_rcv_context, &packet,
803 &dev->broadcast_rcv_buffer, offset);
804
805 spin_unlock_irqrestore(&dev->lock, flags);
806
807 if (retval >= 0)
808 fw_iso_context_queue_flush(dev->broadcast_rcv_context);
809 else
810 dev_err(&dev->netdev->dev, "requeue failed\n");
811 }
812
813 static struct kmem_cache *fwnet_packet_task_cache;
814
815 static void fwnet_free_ptask(struct fwnet_packet_task *ptask)
816 {
817 dev_kfree_skb_any(ptask->skb);
818 kmem_cache_free(fwnet_packet_task_cache, ptask);
819 }
820
821 /* Caller must hold dev->lock. */
822 static void dec_queued_datagrams(struct fwnet_device *dev)
823 {
824 if (--dev->queued_datagrams == FWNET_MIN_QUEUED_DATAGRAMS)
825 netif_wake_queue(dev->netdev);
826 }
827
828 static int fwnet_send_packet(struct fwnet_packet_task *ptask);
829
830 static void fwnet_transmit_packet_done(struct fwnet_packet_task *ptask)
831 {
832 struct fwnet_device *dev = ptask->dev;
833 struct sk_buff *skb = ptask->skb;
834 unsigned long flags;
835 bool free;
836
837 spin_lock_irqsave(&dev->lock, flags);
838
839 ptask->outstanding_pkts--;
840
841 /* Check whether we or the networking TX soft-IRQ is last user. */
842 free = (ptask->outstanding_pkts == 0 && ptask->enqueued);
843 if (free)
844 dec_queued_datagrams(dev);
845
846 if (ptask->outstanding_pkts == 0) {
847 dev->netdev->stats.tx_packets++;
848 dev->netdev->stats.tx_bytes += skb->len;
849 }
850
851 spin_unlock_irqrestore(&dev->lock, flags);
852
853 if (ptask->outstanding_pkts > 0) {
854 u16 dg_size;
855 u16 fg_off;
856 u16 datagram_label;
857 u16 lf;
858
859 /* Update the ptask to point to the next fragment and send it */
860 lf = fwnet_get_hdr_lf(&ptask->hdr);
861 switch (lf) {
862 case RFC2374_HDR_LASTFRAG:
863 case RFC2374_HDR_UNFRAG:
864 default:
865 dev_err(&dev->netdev->dev,
866 "outstanding packet %x lf %x, header %x,%x\n",
867 ptask->outstanding_pkts, lf, ptask->hdr.w0,
868 ptask->hdr.w1);
869 BUG();
870
871 case RFC2374_HDR_FIRSTFRAG:
872 /* Set frag type here for future interior fragments */
873 dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
874 fg_off = ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
875 datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
876 break;
877
878 case RFC2374_HDR_INTFRAG:
879 dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
880 fg_off = fwnet_get_hdr_fg_off(&ptask->hdr)
881 + ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
882 datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
883 break;
884 }
885
886 if (ptask->dest_node == IEEE1394_ALL_NODES) {
887 skb_pull(skb,
888 ptask->max_payload + IEEE1394_GASP_HDR_SIZE);
889 } else {
890 skb_pull(skb, ptask->max_payload);
891 }
892 if (ptask->outstanding_pkts > 1) {
893 fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_INTFRAG,
894 dg_size, fg_off, datagram_label);
895 } else {
896 fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_LASTFRAG,
897 dg_size, fg_off, datagram_label);
898 ptask->max_payload = skb->len + RFC2374_FRAG_HDR_SIZE;
899 }
900 fwnet_send_packet(ptask);
901 }
902
903 if (free)
904 fwnet_free_ptask(ptask);
905 }
906
907 static void fwnet_transmit_packet_failed(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 /* One fragment failed; don't try to send remaining fragments. */
916 ptask->outstanding_pkts = 0;
917
918 /* Check whether we or the networking TX soft-IRQ is last user. */
919 free = ptask->enqueued;
920 if (free)
921 dec_queued_datagrams(dev);
922
923 dev->netdev->stats.tx_dropped++;
924 dev->netdev->stats.tx_errors++;
925
926 spin_unlock_irqrestore(&dev->lock, flags);
927
928 if (free)
929 fwnet_free_ptask(ptask);
930 }
931
932 static void fwnet_write_complete(struct fw_card *card, int rcode,
933 void *payload, size_t length, void *data)
934 {
935 struct fwnet_packet_task *ptask = data;
936 static unsigned long j;
937 static int last_rcode, errors_skipped;
938
939 if (rcode == RCODE_COMPLETE) {
940 fwnet_transmit_packet_done(ptask);
941 } else {
942 if (printk_timed_ratelimit(&j, 1000) || rcode != last_rcode) {
943 dev_err(&ptask->dev->netdev->dev,
944 "fwnet_write_complete failed: %x (skipped %d)\n",
945 rcode, errors_skipped);
946
947 errors_skipped = 0;
948 last_rcode = rcode;
949 } else {
950 errors_skipped++;
951 }
952 fwnet_transmit_packet_failed(ptask);
953 }
954 }
955
956 static int fwnet_send_packet(struct fwnet_packet_task *ptask)
957 {
958 struct fwnet_device *dev;
959 unsigned tx_len;
960 struct rfc2734_header *bufhdr;
961 unsigned long flags;
962 bool free;
963
964 dev = ptask->dev;
965 tx_len = ptask->max_payload;
966 switch (fwnet_get_hdr_lf(&ptask->hdr)) {
967 case RFC2374_HDR_UNFRAG:
968 bufhdr = skb_push(ptask->skb, RFC2374_UNFRAG_HDR_SIZE);
969 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
970 break;
971
972 case RFC2374_HDR_FIRSTFRAG:
973 case RFC2374_HDR_INTFRAG:
974 case RFC2374_HDR_LASTFRAG:
975 bufhdr = skb_push(ptask->skb, RFC2374_FRAG_HDR_SIZE);
976 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
977 put_unaligned_be32(ptask->hdr.w1, &bufhdr->w1);
978 break;
979
980 default:
981 BUG();
982 }
983 if (ptask->dest_node == IEEE1394_ALL_NODES) {
984 u8 *p;
985 int generation;
986 int node_id;
987 unsigned int sw_version;
988
989 /* ptask->generation may not have been set yet */
990 generation = dev->card->generation;
991 smp_rmb();
992 node_id = dev->card->node_id;
993
994 switch (ptask->skb->protocol) {
995 default:
996 sw_version = RFC2734_SW_VERSION;
997 break;
998 #if IS_ENABLED(CONFIG_IPV6)
999 case htons(ETH_P_IPV6):
1000 sw_version = RFC3146_SW_VERSION;
1001 #endif
1002 }
1003
1004 p = skb_push(ptask->skb, IEEE1394_GASP_HDR_SIZE);
1005 put_unaligned_be32(node_id << 16 | IANA_SPECIFIER_ID >> 8, p);
1006 put_unaligned_be32((IANA_SPECIFIER_ID & 0xff) << 24
1007 | sw_version, &p[4]);
1008
1009 /* We should not transmit if broadcast_channel.valid == 0. */
1010 fw_send_request(dev->card, &ptask->transaction,
1011 TCODE_STREAM_DATA,
1012 fw_stream_packet_destination_id(3,
1013 IEEE1394_BROADCAST_CHANNEL, 0),
1014 generation, SCODE_100, 0ULL, ptask->skb->data,
1015 tx_len + 8, fwnet_write_complete, ptask);
1016
1017 spin_lock_irqsave(&dev->lock, flags);
1018
1019 /* If the AT tasklet already ran, we may be last user. */
1020 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1021 if (!free)
1022 ptask->enqueued = true;
1023 else
1024 dec_queued_datagrams(dev);
1025
1026 spin_unlock_irqrestore(&dev->lock, flags);
1027
1028 goto out;
1029 }
1030
1031 fw_send_request(dev->card, &ptask->transaction,
1032 TCODE_WRITE_BLOCK_REQUEST, ptask->dest_node,
1033 ptask->generation, ptask->speed, ptask->fifo_addr,
1034 ptask->skb->data, tx_len, fwnet_write_complete, ptask);
1035
1036 spin_lock_irqsave(&dev->lock, flags);
1037
1038 /* If the AT tasklet already ran, we may be last user. */
1039 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1040 if (!free)
1041 ptask->enqueued = true;
1042 else
1043 dec_queued_datagrams(dev);
1044
1045 spin_unlock_irqrestore(&dev->lock, flags);
1046
1047 netif_trans_update(dev->netdev);
1048 out:
1049 if (free)
1050 fwnet_free_ptask(ptask);
1051
1052 return 0;
1053 }
1054
1055 static void fwnet_fifo_stop(struct fwnet_device *dev)
1056 {
1057 if (dev->local_fifo == FWNET_NO_FIFO_ADDR)
1058 return;
1059
1060 fw_core_remove_address_handler(&dev->handler);
1061 dev->local_fifo = FWNET_NO_FIFO_ADDR;
1062 }
1063
1064 static int fwnet_fifo_start(struct fwnet_device *dev)
1065 {
1066 int retval;
1067
1068 if (dev->local_fifo != FWNET_NO_FIFO_ADDR)
1069 return 0;
1070
1071 dev->handler.length = 4096;
1072 dev->handler.address_callback = fwnet_receive_packet;
1073 dev->handler.callback_data = dev;
1074
1075 retval = fw_core_add_address_handler(&dev->handler,
1076 &fw_high_memory_region);
1077 if (retval < 0)
1078 return retval;
1079
1080 dev->local_fifo = dev->handler.offset;
1081
1082 return 0;
1083 }
1084
1085 static void __fwnet_broadcast_stop(struct fwnet_device *dev)
1086 {
1087 unsigned u;
1088
1089 if (dev->broadcast_state != FWNET_BROADCAST_ERROR) {
1090 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++)
1091 kunmap(dev->broadcast_rcv_buffer.pages[u]);
1092 fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer, dev->card);
1093 }
1094 if (dev->broadcast_rcv_context) {
1095 fw_iso_context_destroy(dev->broadcast_rcv_context);
1096 dev->broadcast_rcv_context = NULL;
1097 }
1098 kfree(dev->broadcast_rcv_buffer_ptrs);
1099 dev->broadcast_rcv_buffer_ptrs = NULL;
1100 dev->broadcast_state = FWNET_BROADCAST_ERROR;
1101 }
1102
1103 static void fwnet_broadcast_stop(struct fwnet_device *dev)
1104 {
1105 if (dev->broadcast_state == FWNET_BROADCAST_ERROR)
1106 return;
1107 fw_iso_context_stop(dev->broadcast_rcv_context);
1108 __fwnet_broadcast_stop(dev);
1109 }
1110
1111 static int fwnet_broadcast_start(struct fwnet_device *dev)
1112 {
1113 struct fw_iso_context *context;
1114 int retval;
1115 unsigned num_packets;
1116 unsigned max_receive;
1117 struct fw_iso_packet packet;
1118 unsigned long offset;
1119 void **ptrptr;
1120 unsigned u;
1121
1122 if (dev->broadcast_state != FWNET_BROADCAST_ERROR)
1123 return 0;
1124
1125 max_receive = 1U << (dev->card->max_receive + 1);
1126 num_packets = (FWNET_ISO_PAGE_COUNT * PAGE_SIZE) / max_receive;
1127
1128 ptrptr = kmalloc_array(num_packets, sizeof(void *), GFP_KERNEL);
1129 if (!ptrptr) {
1130 retval = -ENOMEM;
1131 goto failed;
1132 }
1133 dev->broadcast_rcv_buffer_ptrs = ptrptr;
1134
1135 context = fw_iso_context_create(dev->card, FW_ISO_CONTEXT_RECEIVE,
1136 IEEE1394_BROADCAST_CHANNEL,
1137 dev->card->link_speed, 8,
1138 fwnet_receive_broadcast, dev);
1139 if (IS_ERR(context)) {
1140 retval = PTR_ERR(context);
1141 goto failed;
1142 }
1143
1144 retval = fw_iso_buffer_init(&dev->broadcast_rcv_buffer, dev->card,
1145 FWNET_ISO_PAGE_COUNT, DMA_FROM_DEVICE);
1146 if (retval < 0)
1147 goto failed;
1148
1149 dev->broadcast_state = FWNET_BROADCAST_STOPPED;
1150
1151 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++) {
1152 void *ptr;
1153 unsigned v;
1154
1155 ptr = kmap(dev->broadcast_rcv_buffer.pages[u]);
1156 for (v = 0; v < num_packets / FWNET_ISO_PAGE_COUNT; v++)
1157 *ptrptr++ = (void *) ((char *)ptr + v * max_receive);
1158 }
1159 dev->broadcast_rcv_context = context;
1160
1161 packet.payload_length = max_receive;
1162 packet.interrupt = 1;
1163 packet.skip = 0;
1164 packet.tag = 3;
1165 packet.sy = 0;
1166 packet.header_length = IEEE1394_GASP_HDR_SIZE;
1167 offset = 0;
1168
1169 for (u = 0; u < num_packets; u++) {
1170 retval = fw_iso_context_queue(context, &packet,
1171 &dev->broadcast_rcv_buffer, offset);
1172 if (retval < 0)
1173 goto failed;
1174
1175 offset += max_receive;
1176 }
1177 dev->num_broadcast_rcv_ptrs = num_packets;
1178 dev->rcv_buffer_size = max_receive;
1179 dev->broadcast_rcv_next_ptr = 0U;
1180 retval = fw_iso_context_start(context, -1, 0,
1181 FW_ISO_CONTEXT_MATCH_ALL_TAGS); /* ??? sync */
1182 if (retval < 0)
1183 goto failed;
1184
1185 /* FIXME: adjust it according to the min. speed of all known peers? */
1186 dev->broadcast_xmt_max_payload = IEEE1394_MAX_PAYLOAD_S100
1187 - IEEE1394_GASP_HDR_SIZE - RFC2374_UNFRAG_HDR_SIZE;
1188 dev->broadcast_state = FWNET_BROADCAST_RUNNING;
1189
1190 return 0;
1191
1192 failed:
1193 __fwnet_broadcast_stop(dev);
1194 return retval;
1195 }
1196
1197 static void set_carrier_state(struct fwnet_device *dev)
1198 {
1199 if (dev->peer_count > 1)
1200 netif_carrier_on(dev->netdev);
1201 else
1202 netif_carrier_off(dev->netdev);
1203 }
1204
1205 /* ifup */
1206 static int fwnet_open(struct net_device *net)
1207 {
1208 struct fwnet_device *dev = netdev_priv(net);
1209 int ret;
1210
1211 ret = fwnet_broadcast_start(dev);
1212 if (ret)
1213 return ret;
1214
1215 netif_start_queue(net);
1216
1217 spin_lock_irq(&dev->lock);
1218 set_carrier_state(dev);
1219 spin_unlock_irq(&dev->lock);
1220
1221 return 0;
1222 }
1223
1224 /* ifdown */
1225 static int fwnet_stop(struct net_device *net)
1226 {
1227 struct fwnet_device *dev = netdev_priv(net);
1228
1229 netif_stop_queue(net);
1230 fwnet_broadcast_stop(dev);
1231
1232 return 0;
1233 }
1234
1235 static netdev_tx_t fwnet_tx(struct sk_buff *skb, struct net_device *net)
1236 {
1237 struct fwnet_header hdr_buf;
1238 struct fwnet_device *dev = netdev_priv(net);
1239 __be16 proto;
1240 u16 dest_node;
1241 unsigned max_payload;
1242 u16 dg_size;
1243 u16 *datagram_label_ptr;
1244 struct fwnet_packet_task *ptask;
1245 struct fwnet_peer *peer;
1246 unsigned long flags;
1247
1248 spin_lock_irqsave(&dev->lock, flags);
1249
1250 /* Can this happen? */
1251 if (netif_queue_stopped(dev->netdev)) {
1252 spin_unlock_irqrestore(&dev->lock, flags);
1253
1254 return NETDEV_TX_BUSY;
1255 }
1256
1257 ptask = kmem_cache_alloc(fwnet_packet_task_cache, GFP_ATOMIC);
1258 if (ptask == NULL)
1259 goto fail;
1260
1261 skb = skb_share_check(skb, GFP_ATOMIC);
1262 if (!skb)
1263 goto fail;
1264
1265 /*
1266 * Make a copy of the driver-specific header.
1267 * We might need to rebuild the header on tx failure.
1268 */
1269 memcpy(&hdr_buf, skb->data, sizeof(hdr_buf));
1270 proto = hdr_buf.h_proto;
1271
1272 switch (proto) {
1273 case htons(ETH_P_ARP):
1274 case htons(ETH_P_IP):
1275 #if IS_ENABLED(CONFIG_IPV6)
1276 case htons(ETH_P_IPV6):
1277 #endif
1278 break;
1279 default:
1280 goto fail;
1281 }
1282
1283 skb_pull(skb, sizeof(hdr_buf));
1284 dg_size = skb->len;
1285
1286 /*
1287 * Set the transmission type for the packet. ARP packets and IP
1288 * broadcast packets are sent via GASP.
1289 */
1290 if (fwnet_hwaddr_is_multicast(hdr_buf.h_dest)) {
1291 max_payload = dev->broadcast_xmt_max_payload;
1292 datagram_label_ptr = &dev->broadcast_xmt_datagramlabel;
1293
1294 ptask->fifo_addr = FWNET_NO_FIFO_ADDR;
1295 ptask->generation = 0;
1296 ptask->dest_node = IEEE1394_ALL_NODES;
1297 ptask->speed = SCODE_100;
1298 } else {
1299 union fwnet_hwaddr *ha = (union fwnet_hwaddr *)hdr_buf.h_dest;
1300 __be64 guid = get_unaligned(&ha->uc.uniq_id);
1301 u8 generation;
1302
1303 peer = fwnet_peer_find_by_guid(dev, be64_to_cpu(guid));
1304 if (!peer)
1305 goto fail;
1306
1307 generation = peer->generation;
1308 dest_node = peer->node_id;
1309 max_payload = peer->max_payload;
1310 datagram_label_ptr = &peer->datagram_label;
1311
1312 ptask->fifo_addr = fwnet_hwaddr_fifo(ha);
1313 ptask->generation = generation;
1314 ptask->dest_node = dest_node;
1315 ptask->speed = peer->speed;
1316 }
1317
1318 ptask->hdr.w0 = 0;
1319 ptask->hdr.w1 = 0;
1320 ptask->skb = skb;
1321 ptask->dev = dev;
1322
1323 /* Does it all fit in one packet? */
1324 if (dg_size <= max_payload) {
1325 fwnet_make_uf_hdr(&ptask->hdr, ntohs(proto));
1326 ptask->outstanding_pkts = 1;
1327 max_payload = dg_size + RFC2374_UNFRAG_HDR_SIZE;
1328 } else {
1329 u16 datagram_label;
1330
1331 max_payload -= RFC2374_FRAG_OVERHEAD;
1332 datagram_label = (*datagram_label_ptr)++;
1333 fwnet_make_ff_hdr(&ptask->hdr, ntohs(proto), dg_size,
1334 datagram_label);
1335 ptask->outstanding_pkts = DIV_ROUND_UP(dg_size, max_payload);
1336 max_payload += RFC2374_FRAG_HDR_SIZE;
1337 }
1338
1339 if (++dev->queued_datagrams == FWNET_MAX_QUEUED_DATAGRAMS)
1340 netif_stop_queue(dev->netdev);
1341
1342 spin_unlock_irqrestore(&dev->lock, flags);
1343
1344 ptask->max_payload = max_payload;
1345 ptask->enqueued = 0;
1346
1347 fwnet_send_packet(ptask);
1348
1349 return NETDEV_TX_OK;
1350
1351 fail:
1352 spin_unlock_irqrestore(&dev->lock, flags);
1353
1354 if (ptask)
1355 kmem_cache_free(fwnet_packet_task_cache, ptask);
1356
1357 if (skb != NULL)
1358 dev_kfree_skb(skb);
1359
1360 net->stats.tx_dropped++;
1361 net->stats.tx_errors++;
1362
1363 /*
1364 * FIXME: According to a patch from 2003-02-26, "returning non-zero
1365 * causes serious problems" here, allegedly. Before that patch,
1366 * -ERRNO was returned which is not appropriate under Linux 2.6.
1367 * Perhaps more needs to be done? Stop the queue in serious
1368 * conditions and restart it elsewhere?
1369 */
1370 return NETDEV_TX_OK;
1371 }
1372
1373 static const struct ethtool_ops fwnet_ethtool_ops = {
1374 .get_link = ethtool_op_get_link,
1375 };
1376
1377 static const struct net_device_ops fwnet_netdev_ops = {
1378 .ndo_open = fwnet_open,
1379 .ndo_stop = fwnet_stop,
1380 .ndo_start_xmit = fwnet_tx,
1381 };
1382
1383 static void fwnet_init_dev(struct net_device *net)
1384 {
1385 net->header_ops = &fwnet_header_ops;
1386 net->netdev_ops = &fwnet_netdev_ops;
1387 net->watchdog_timeo = 2 * HZ;
1388 net->flags = IFF_BROADCAST | IFF_MULTICAST;
1389 net->features = NETIF_F_HIGHDMA;
1390 net->addr_len = FWNET_ALEN;
1391 net->hard_header_len = FWNET_HLEN;
1392 net->type = ARPHRD_IEEE1394;
1393 net->tx_queue_len = FWNET_TX_QUEUE_LEN;
1394 net->ethtool_ops = &fwnet_ethtool_ops;
1395 }
1396
1397 /* caller must hold fwnet_device_mutex */
1398 static struct fwnet_device *fwnet_dev_find(struct fw_card *card)
1399 {
1400 struct fwnet_device *dev;
1401
1402 list_for_each_entry(dev, &fwnet_device_list, dev_link)
1403 if (dev->card == card)
1404 return dev;
1405
1406 return NULL;
1407 }
1408
1409 static int fwnet_add_peer(struct fwnet_device *dev,
1410 struct fw_unit *unit, struct fw_device *device)
1411 {
1412 struct fwnet_peer *peer;
1413
1414 peer = kmalloc(sizeof(*peer), GFP_KERNEL);
1415 if (!peer)
1416 return -ENOMEM;
1417
1418 dev_set_drvdata(&unit->device, peer);
1419
1420 peer->dev = dev;
1421 peer->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4];
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 dev->peer_count++;
1435 set_carrier_state(dev);
1436 spin_unlock_irq(&dev->lock);
1437
1438 return 0;
1439 }
1440
1441 static int fwnet_probe(struct fw_unit *unit,
1442 const struct ieee1394_device_id *id)
1443 {
1444 struct fw_device *device = fw_parent_device(unit);
1445 struct fw_card *card = device->card;
1446 struct net_device *net;
1447 bool allocated_netdev = false;
1448 struct fwnet_device *dev;
1449 int ret;
1450 union fwnet_hwaddr *ha;
1451
1452 mutex_lock(&fwnet_device_mutex);
1453
1454 dev = fwnet_dev_find(card);
1455 if (dev) {
1456 net = dev->netdev;
1457 goto have_dev;
1458 }
1459
1460 net = alloc_netdev(sizeof(*dev), "firewire%d", NET_NAME_UNKNOWN,
1461 fwnet_init_dev);
1462 if (net == NULL) {
1463 mutex_unlock(&fwnet_device_mutex);
1464 return -ENOMEM;
1465 }
1466
1467 allocated_netdev = true;
1468 SET_NETDEV_DEV(net, card->device);
1469 dev = netdev_priv(net);
1470
1471 spin_lock_init(&dev->lock);
1472 dev->broadcast_state = FWNET_BROADCAST_ERROR;
1473 dev->broadcast_rcv_context = NULL;
1474 dev->broadcast_xmt_max_payload = 0;
1475 dev->broadcast_xmt_datagramlabel = 0;
1476 dev->local_fifo = FWNET_NO_FIFO_ADDR;
1477 dev->queued_datagrams = 0;
1478 INIT_LIST_HEAD(&dev->peer_list);
1479 dev->card = card;
1480 dev->netdev = net;
1481
1482 ret = fwnet_fifo_start(dev);
1483 if (ret < 0)
1484 goto out;
1485 dev->local_fifo = dev->handler.offset;
1486
1487 /*
1488 * default MTU: RFC 2734 cl. 4, RFC 3146 cl. 4
1489 * maximum MTU: RFC 2734 cl. 4.2, fragment encapsulation header's
1490 * maximum possible datagram_size + 1 = 0xfff + 1
1491 */
1492 net->mtu = 1500U;
1493 net->min_mtu = ETH_MIN_MTU;
1494 net->max_mtu = 4096U;
1495
1496 /* Set our hardware address while we're at it */
1497 ha = (union fwnet_hwaddr *)net->dev_addr;
1498 put_unaligned_be64(card->guid, &ha->uc.uniq_id);
1499 ha->uc.max_rec = dev->card->max_receive;
1500 ha->uc.sspd = dev->card->link_speed;
1501 put_unaligned_be16(dev->local_fifo >> 32, &ha->uc.fifo_hi);
1502 put_unaligned_be32(dev->local_fifo & 0xffffffff, &ha->uc.fifo_lo);
1503
1504 memset(net->broadcast, -1, net->addr_len);
1505
1506 ret = register_netdev(net);
1507 if (ret)
1508 goto out;
1509
1510 list_add_tail(&dev->dev_link, &fwnet_device_list);
1511 dev_notice(&net->dev, "IP over IEEE 1394 on card %s\n",
1512 dev_name(card->device));
1513 have_dev:
1514 ret = fwnet_add_peer(dev, unit, device);
1515 if (ret && allocated_netdev) {
1516 unregister_netdev(net);
1517 list_del(&dev->dev_link);
1518 out:
1519 fwnet_fifo_stop(dev);
1520 free_netdev(net);
1521 }
1522
1523 mutex_unlock(&fwnet_device_mutex);
1524
1525 return ret;
1526 }
1527
1528 /*
1529 * FIXME abort partially sent fragmented datagrams,
1530 * discard partially received fragmented datagrams
1531 */
1532 static void fwnet_update(struct fw_unit *unit)
1533 {
1534 struct fw_device *device = fw_parent_device(unit);
1535 struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1536 int generation;
1537
1538 generation = device->generation;
1539
1540 spin_lock_irq(&peer->dev->lock);
1541 peer->node_id = device->node_id;
1542 peer->generation = generation;
1543 spin_unlock_irq(&peer->dev->lock);
1544 }
1545
1546 static void fwnet_remove_peer(struct fwnet_peer *peer, struct fwnet_device *dev)
1547 {
1548 struct fwnet_partial_datagram *pd, *pd_next;
1549
1550 spin_lock_irq(&dev->lock);
1551 list_del(&peer->peer_link);
1552 dev->peer_count--;
1553 set_carrier_state(dev);
1554 spin_unlock_irq(&dev->lock);
1555
1556 list_for_each_entry_safe(pd, pd_next, &peer->pd_list, pd_link)
1557 fwnet_pd_delete(pd);
1558
1559 kfree(peer);
1560 }
1561
1562 static void fwnet_remove(struct fw_unit *unit)
1563 {
1564 struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1565 struct fwnet_device *dev = peer->dev;
1566 struct net_device *net;
1567 int i;
1568
1569 mutex_lock(&fwnet_device_mutex);
1570
1571 net = dev->netdev;
1572
1573 fwnet_remove_peer(peer, dev);
1574
1575 if (list_empty(&dev->peer_list)) {
1576 unregister_netdev(net);
1577
1578 fwnet_fifo_stop(dev);
1579
1580 for (i = 0; dev->queued_datagrams && i < 5; i++)
1581 ssleep(1);
1582 WARN_ON(dev->queued_datagrams);
1583 list_del(&dev->dev_link);
1584
1585 free_netdev(net);
1586 }
1587
1588 mutex_unlock(&fwnet_device_mutex);
1589 }
1590
1591 static const struct ieee1394_device_id fwnet_id_table[] = {
1592 {
1593 .match_flags = IEEE1394_MATCH_SPECIFIER_ID |
1594 IEEE1394_MATCH_VERSION,
1595 .specifier_id = IANA_SPECIFIER_ID,
1596 .version = RFC2734_SW_VERSION,
1597 },
1598 #if IS_ENABLED(CONFIG_IPV6)
1599 {
1600 .match_flags = IEEE1394_MATCH_SPECIFIER_ID |
1601 IEEE1394_MATCH_VERSION,
1602 .specifier_id = IANA_SPECIFIER_ID,
1603 .version = RFC3146_SW_VERSION,
1604 },
1605 #endif
1606 { }
1607 };
1608
1609 static struct fw_driver fwnet_driver = {
1610 .driver = {
1611 .owner = THIS_MODULE,
1612 .name = KBUILD_MODNAME,
1613 .bus = &fw_bus_type,
1614 },
1615 .probe = fwnet_probe,
1616 .update = fwnet_update,
1617 .remove = fwnet_remove,
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 #if IS_ENABLED(CONFIG_IPV6)
1644 static const u32 rfc3146_unit_directory_data[] = {
1645 0x00040000, /* directory_length */
1646 0x1200005e, /* unit_specifier_id: IANA */
1647 0x81000003, /* textual descriptor offset */
1648 0x13000002, /* unit_sw_version: RFC 3146 */
1649 0x81000005, /* textual descriptor offset */
1650 0x00030000, /* descriptor_length */
1651 0x00000000, /* text */
1652 0x00000000, /* minimal ASCII, en */
1653 0x49414e41, /* I A N A */
1654 0x00030000, /* descriptor_length */
1655 0x00000000, /* text */
1656 0x00000000, /* minimal ASCII, en */
1657 0x49507636, /* I P v 6 */
1658 };
1659
1660 static struct fw_descriptor rfc3146_unit_directory = {
1661 .length = ARRAY_SIZE(rfc3146_unit_directory_data),
1662 .key = (CSR_DIRECTORY | CSR_UNIT) << 24,
1663 .data = rfc3146_unit_directory_data
1664 };
1665 #endif
1666
1667 static int __init fwnet_init(void)
1668 {
1669 int err;
1670
1671 err = fw_core_add_descriptor(&rfc2374_unit_directory);
1672 if (err)
1673 return err;
1674
1675 #if IS_ENABLED(CONFIG_IPV6)
1676 err = fw_core_add_descriptor(&rfc3146_unit_directory);
1677 if (err)
1678 goto out;
1679 #endif
1680
1681 fwnet_packet_task_cache = kmem_cache_create("packet_task",
1682 sizeof(struct fwnet_packet_task), 0, 0, NULL);
1683 if (!fwnet_packet_task_cache) {
1684 err = -ENOMEM;
1685 goto out2;
1686 }
1687
1688 err = driver_register(&fwnet_driver.driver);
1689 if (!err)
1690 return 0;
1691
1692 kmem_cache_destroy(fwnet_packet_task_cache);
1693 out2:
1694 #if IS_ENABLED(CONFIG_IPV6)
1695 fw_core_remove_descriptor(&rfc3146_unit_directory);
1696 out:
1697 #endif
1698 fw_core_remove_descriptor(&rfc2374_unit_directory);
1699
1700 return err;
1701 }
1702 module_init(fwnet_init);
1703
1704 static void __exit fwnet_cleanup(void)
1705 {
1706 driver_unregister(&fwnet_driver.driver);
1707 kmem_cache_destroy(fwnet_packet_task_cache);
1708 #if IS_ENABLED(CONFIG_IPV6)
1709 fw_core_remove_descriptor(&rfc3146_unit_directory);
1710 #endif
1711 fw_core_remove_descriptor(&rfc2374_unit_directory);
1712 }
1713 module_exit(fwnet_cleanup);
1714
1715 MODULE_AUTHOR("Jay Fenlason <fenlason@redhat.com>");
1716 MODULE_DESCRIPTION("IP over IEEE1394 as per RFC 2734/3146");
1717 MODULE_LICENSE("GPL");
1718 MODULE_DEVICE_TABLE(ieee1394, fwnet_id_table);
Linux with added FPC-III support