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x86/xen: resume timer irqs early
[linux/fpc-iii.git] / drivers / firewire / net.c
blob4af0a7bad7f21561cc4e7a29031c238a34f0135d
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)
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) << 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_rebuild(struct sk_buff *skb)
241 {
242 struct fwnet_header *h = (struct fwnet_header *)skb->data;
243
244 if (get_unaligned_be16(&h->h_proto) == ETH_P_IP)
245 return arp_find((unsigned char *)&h->h_dest, skb);
246
247 dev_notice(&skb->dev->dev, "unable to resolve type %04x addresses\n",
248 be16_to_cpu(h->h_proto));
249 return 0;
250 }
251
252 static int fwnet_header_cache(const struct neighbour *neigh,
253 struct hh_cache *hh, __be16 type)
254 {
255 struct net_device *net;
256 struct fwnet_header *h;
257
258 if (type == cpu_to_be16(ETH_P_802_3))
259 return -1;
260 net = neigh->dev;
261 h = (struct fwnet_header *)((u8 *)hh->hh_data + HH_DATA_OFF(sizeof(*h)));
262 h->h_proto = type;
263 memcpy(h->h_dest, neigh->ha, net->addr_len);
264 hh->hh_len = FWNET_HLEN;
265
266 return 0;
267 }
268
269 /* Called by Address Resolution module to notify changes in address. */
270 static void fwnet_header_cache_update(struct hh_cache *hh,
271 const struct net_device *net, const unsigned char *haddr)
272 {
273 memcpy((u8 *)hh->hh_data + HH_DATA_OFF(FWNET_HLEN), haddr, net->addr_len);
274 }
275
276 static int fwnet_header_parse(const struct sk_buff *skb, unsigned char *haddr)
277 {
278 memcpy(haddr, skb->dev->dev_addr, FWNET_ALEN);
279
280 return FWNET_ALEN;
281 }
282
283 static const struct header_ops fwnet_header_ops = {
284 .create = fwnet_header_create,
285 .rebuild = fwnet_header_rebuild,
286 .cache = fwnet_header_cache,
287 .cache_update = fwnet_header_cache_update,
288 .parse = fwnet_header_parse,
289 };
290
291 /* FIXME: is this correct for all cases? */
292 static bool fwnet_frag_overlap(struct fwnet_partial_datagram *pd,
293 unsigned offset, unsigned len)
294 {
295 struct fwnet_fragment_info *fi;
296 unsigned end = offset + len;
297
298 list_for_each_entry(fi, &pd->fi_list, fi_link)
299 if (offset < fi->offset + fi->len && end > fi->offset)
300 return true;
301
302 return false;
303 }
304
305 /* Assumes that new fragment does not overlap any existing fragments */
306 static struct fwnet_fragment_info *fwnet_frag_new(
307 struct fwnet_partial_datagram *pd, unsigned offset, unsigned len)
308 {
309 struct fwnet_fragment_info *fi, *fi2, *new;
310 struct list_head *list;
311
312 list = &pd->fi_list;
313 list_for_each_entry(fi, &pd->fi_list, fi_link) {
314 if (fi->offset + fi->len == offset) {
315 /* The new fragment can be tacked on to the end */
316 /* Did the new fragment plug a hole? */
317 fi2 = list_entry(fi->fi_link.next,
318 struct fwnet_fragment_info, fi_link);
319 if (fi->offset + fi->len == fi2->offset) {
320 /* glue fragments together */
321 fi->len += len + fi2->len;
322 list_del(&fi2->fi_link);
323 kfree(fi2);
324 } else {
325 fi->len += len;
326 }
327
328 return fi;
329 }
330 if (offset + len == fi->offset) {
331 /* The new fragment can be tacked on to the beginning */
332 /* Did the new fragment plug a hole? */
333 fi2 = list_entry(fi->fi_link.prev,
334 struct fwnet_fragment_info, fi_link);
335 if (fi2->offset + fi2->len == fi->offset) {
336 /* glue fragments together */
337 fi2->len += fi->len + len;
338 list_del(&fi->fi_link);
339 kfree(fi);
340
341 return fi2;
342 }
343 fi->offset = offset;
344 fi->len += len;
345
346 return fi;
347 }
348 if (offset > fi->offset + fi->len) {
349 list = &fi->fi_link;
350 break;
351 }
352 if (offset + len < fi->offset) {
353 list = fi->fi_link.prev;
354 break;
355 }
356 }
357
358 new = kmalloc(sizeof(*new), GFP_ATOMIC);
359 if (!new)
360 return NULL;
361
362 new->offset = offset;
363 new->len = len;
364 list_add(&new->fi_link, list);
365
366 return new;
367 }
368
369 static struct fwnet_partial_datagram *fwnet_pd_new(struct net_device *net,
370 struct fwnet_peer *peer, u16 datagram_label, unsigned dg_size,
371 void *frag_buf, unsigned frag_off, unsigned frag_len)
372 {
373 struct fwnet_partial_datagram *new;
374 struct fwnet_fragment_info *fi;
375
376 new = kmalloc(sizeof(*new), GFP_ATOMIC);
377 if (!new)
378 goto fail;
379
380 INIT_LIST_HEAD(&new->fi_list);
381 fi = fwnet_frag_new(new, frag_off, frag_len);
382 if (fi == NULL)
383 goto fail_w_new;
384
385 new->datagram_label = datagram_label;
386 new->datagram_size = dg_size;
387 new->skb = dev_alloc_skb(dg_size + LL_RESERVED_SPACE(net));
388 if (new->skb == NULL)
389 goto fail_w_fi;
390
391 skb_reserve(new->skb, LL_RESERVED_SPACE(net));
392 new->pbuf = skb_put(new->skb, dg_size);
393 memcpy(new->pbuf + frag_off, frag_buf, frag_len);
394 list_add_tail(&new->pd_link, &peer->pd_list);
395
396 return new;
397
398 fail_w_fi:
399 kfree(fi);
400 fail_w_new:
401 kfree(new);
402 fail:
403 return NULL;
404 }
405
406 static struct fwnet_partial_datagram *fwnet_pd_find(struct fwnet_peer *peer,
407 u16 datagram_label)
408 {
409 struct fwnet_partial_datagram *pd;
410
411 list_for_each_entry(pd, &peer->pd_list, pd_link)
412 if (pd->datagram_label == datagram_label)
413 return pd;
414
415 return NULL;
416 }
417
418
419 static void fwnet_pd_delete(struct fwnet_partial_datagram *old)
420 {
421 struct fwnet_fragment_info *fi, *n;
422
423 list_for_each_entry_safe(fi, n, &old->fi_list, fi_link)
424 kfree(fi);
425
426 list_del(&old->pd_link);
427 dev_kfree_skb_any(old->skb);
428 kfree(old);
429 }
430
431 static bool fwnet_pd_update(struct fwnet_peer *peer,
432 struct fwnet_partial_datagram *pd, void *frag_buf,
433 unsigned frag_off, unsigned frag_len)
434 {
435 if (fwnet_frag_new(pd, frag_off, frag_len) == NULL)
436 return false;
437
438 memcpy(pd->pbuf + frag_off, frag_buf, frag_len);
439
440 /*
441 * Move list entry to beginning of list so that oldest partial
442 * datagrams percolate to the end of the list
443 */
444 list_move_tail(&pd->pd_link, &peer->pd_list);
445
446 return true;
447 }
448
449 static bool fwnet_pd_is_complete(struct fwnet_partial_datagram *pd)
450 {
451 struct fwnet_fragment_info *fi;
452
453 fi = list_entry(pd->fi_list.next, struct fwnet_fragment_info, fi_link);
454
455 return fi->len == pd->datagram_size;
456 }
457
458 /* caller must hold dev->lock */
459 static struct fwnet_peer *fwnet_peer_find_by_guid(struct fwnet_device *dev,
460 u64 guid)
461 {
462 struct fwnet_peer *peer;
463
464 list_for_each_entry(peer, &dev->peer_list, peer_link)
465 if (peer->guid == guid)
466 return peer;
467
468 return NULL;
469 }
470
471 /* caller must hold dev->lock */
472 static struct fwnet_peer *fwnet_peer_find_by_node_id(struct fwnet_device *dev,
473 int node_id, int generation)
474 {
475 struct fwnet_peer *peer;
476
477 list_for_each_entry(peer, &dev->peer_list, peer_link)
478 if (peer->node_id == node_id &&
479 peer->generation == generation)
480 return peer;
481
482 return NULL;
483 }
484
485 /* See IEEE 1394-2008 table 6-4, table 8-8, table 16-18. */
486 static unsigned fwnet_max_payload(unsigned max_rec, unsigned speed)
487 {
488 max_rec = min(max_rec, speed + 8);
489 max_rec = clamp(max_rec, 8U, 11U); /* 512...4096 */
490
491 return (1 << (max_rec + 1)) - RFC2374_FRAG_HDR_SIZE;
492 }
493
494
495 static int fwnet_finish_incoming_packet(struct net_device *net,
496 struct sk_buff *skb, u16 source_node_id,
497 bool is_broadcast, u16 ether_type)
498 {
499 struct fwnet_device *dev;
500 int status;
501 __be64 guid;
502
503 switch (ether_type) {
504 case ETH_P_ARP:
505 case ETH_P_IP:
506 #if IS_ENABLED(CONFIG_IPV6)
507 case ETH_P_IPV6:
508 #endif
509 break;
510 default:
511 goto err;
512 }
513
514 dev = netdev_priv(net);
515 /* Write metadata, and then pass to the receive level */
516 skb->dev = net;
517 skb->ip_summed = CHECKSUM_NONE;
518
519 /*
520 * Parse the encapsulation header. This actually does the job of
521 * converting to an ethernet-like pseudo frame header.
522 */
523 guid = cpu_to_be64(dev->card->guid);
524 if (dev_hard_header(skb, net, ether_type,
525 is_broadcast ? net->broadcast : net->dev_addr,
526 NULL, skb->len) >= 0) {
527 struct fwnet_header *eth;
528 u16 *rawp;
529 __be16 protocol;
530
531 skb_reset_mac_header(skb);
532 skb_pull(skb, sizeof(*eth));
533 eth = (struct fwnet_header *)skb_mac_header(skb);
534 if (fwnet_hwaddr_is_multicast(eth->h_dest)) {
535 if (memcmp(eth->h_dest, net->broadcast,
536 net->addr_len) == 0)
537 skb->pkt_type = PACKET_BROADCAST;
538 #if 0
539 else
540 skb->pkt_type = PACKET_MULTICAST;
541 #endif
542 } else {
543 if (memcmp(eth->h_dest, net->dev_addr, net->addr_len))
544 skb->pkt_type = PACKET_OTHERHOST;
545 }
546 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN) {
547 protocol = eth->h_proto;
548 } else {
549 rawp = (u16 *)skb->data;
550 if (*rawp == 0xffff)
551 protocol = htons(ETH_P_802_3);
552 else
553 protocol = htons(ETH_P_802_2);
554 }
555 skb->protocol = protocol;
556 }
557 status = netif_rx(skb);
558 if (status == NET_RX_DROP) {
559 net->stats.rx_errors++;
560 net->stats.rx_dropped++;
561 } else {
562 net->stats.rx_packets++;
563 net->stats.rx_bytes += skb->len;
564 }
565
566 return 0;
567
568 err:
569 net->stats.rx_errors++;
570 net->stats.rx_dropped++;
571
572 dev_kfree_skb_any(skb);
573
574 return -ENOENT;
575 }
576
577 static int fwnet_incoming_packet(struct fwnet_device *dev, __be32 *buf, int len,
578 int source_node_id, int generation,
579 bool is_broadcast)
580 {
581 struct sk_buff *skb;
582 struct net_device *net = dev->netdev;
583 struct rfc2734_header hdr;
584 unsigned lf;
585 unsigned long flags;
586 struct fwnet_peer *peer;
587 struct fwnet_partial_datagram *pd;
588 int fg_off;
589 int dg_size;
590 u16 datagram_label;
591 int retval;
592 u16 ether_type;
593
594 hdr.w0 = be32_to_cpu(buf[0]);
595 lf = fwnet_get_hdr_lf(&hdr);
596 if (lf == RFC2374_HDR_UNFRAG) {
597 /*
598 * An unfragmented datagram has been received by the ieee1394
599 * bus. Build an skbuff around it so we can pass it to the
600 * high level network layer.
601 */
602 ether_type = fwnet_get_hdr_ether_type(&hdr);
603 buf++;
604 len -= RFC2374_UNFRAG_HDR_SIZE;
605
606 skb = dev_alloc_skb(len + LL_RESERVED_SPACE(net));
607 if (unlikely(!skb)) {
608 net->stats.rx_dropped++;
609
610 return -ENOMEM;
611 }
612 skb_reserve(skb, LL_RESERVED_SPACE(net));
613 memcpy(skb_put(skb, len), buf, len);
614
615 return fwnet_finish_incoming_packet(net, skb, source_node_id,
616 is_broadcast, ether_type);
617 }
618 /* A datagram fragment has been received, now the fun begins. */
619 hdr.w1 = ntohl(buf[1]);
620 buf += 2;
621 len -= RFC2374_FRAG_HDR_SIZE;
622 if (lf == RFC2374_HDR_FIRSTFRAG) {
623 ether_type = fwnet_get_hdr_ether_type(&hdr);
624 fg_off = 0;
625 } else {
626 ether_type = 0;
627 fg_off = fwnet_get_hdr_fg_off(&hdr);
628 }
629 datagram_label = fwnet_get_hdr_dgl(&hdr);
630 dg_size = fwnet_get_hdr_dg_size(&hdr); /* ??? + 1 */
631
632 spin_lock_irqsave(&dev->lock, flags);
633
634 peer = fwnet_peer_find_by_node_id(dev, source_node_id, generation);
635 if (!peer) {
636 retval = -ENOENT;
637 goto fail;
638 }
639
640 pd = fwnet_pd_find(peer, datagram_label);
641 if (pd == NULL) {
642 while (peer->pdg_size >= FWNET_MAX_FRAGMENTS) {
643 /* remove the oldest */
644 fwnet_pd_delete(list_first_entry(&peer->pd_list,
645 struct fwnet_partial_datagram, pd_link));
646 peer->pdg_size--;
647 }
648 pd = fwnet_pd_new(net, peer, datagram_label,
649 dg_size, buf, fg_off, len);
650 if (pd == NULL) {
651 retval = -ENOMEM;
652 goto fail;
653 }
654 peer->pdg_size++;
655 } else {
656 if (fwnet_frag_overlap(pd, fg_off, len) ||
657 pd->datagram_size != dg_size) {
658 /*
659 * Differing datagram sizes or overlapping fragments,
660 * discard old datagram and start a new one.
661 */
662 fwnet_pd_delete(pd);
663 pd = fwnet_pd_new(net, peer, datagram_label,
664 dg_size, buf, fg_off, len);
665 if (pd == NULL) {
666 peer->pdg_size--;
667 retval = -ENOMEM;
668 goto fail;
669 }
670 } else {
671 if (!fwnet_pd_update(peer, pd, buf, fg_off, len)) {
672 /*
673 * Couldn't save off fragment anyway
674 * so might as well obliterate the
675 * datagram now.
676 */
677 fwnet_pd_delete(pd);
678 peer->pdg_size--;
679 retval = -ENOMEM;
680 goto fail;
681 }
682 }
683 } /* new datagram or add to existing one */
684
685 if (lf == RFC2374_HDR_FIRSTFRAG)
686 pd->ether_type = ether_type;
687
688 if (fwnet_pd_is_complete(pd)) {
689 ether_type = pd->ether_type;
690 peer->pdg_size--;
691 skb = skb_get(pd->skb);
692 fwnet_pd_delete(pd);
693
694 spin_unlock_irqrestore(&dev->lock, flags);
695
696 return fwnet_finish_incoming_packet(net, skb, source_node_id,
697 false, ether_type);
698 }
699 /*
700 * Datagram is not complete, we're done for the
701 * moment.
702 */
703 retval = 0;
704 fail:
705 spin_unlock_irqrestore(&dev->lock, flags);
706
707 return retval;
708 }
709
710 static void fwnet_receive_packet(struct fw_card *card, struct fw_request *r,
711 int tcode, int destination, int source, int generation,
712 unsigned long long offset, void *payload, size_t length,
713 void *callback_data)
714 {
715 struct fwnet_device *dev = callback_data;
716 int rcode;
717
718 if (destination == IEEE1394_ALL_NODES) {
719 kfree(r);
720
721 return;
722 }
723
724 if (offset != dev->handler.offset)
725 rcode = RCODE_ADDRESS_ERROR;
726 else if (tcode != TCODE_WRITE_BLOCK_REQUEST)
727 rcode = RCODE_TYPE_ERROR;
728 else if (fwnet_incoming_packet(dev, payload, length,
729 source, generation, false) != 0) {
730 dev_err(&dev->netdev->dev, "incoming packet failure\n");
731 rcode = RCODE_CONFLICT_ERROR;
732 } else
733 rcode = RCODE_COMPLETE;
734
735 fw_send_response(card, r, rcode);
736 }
737
738 static void fwnet_receive_broadcast(struct fw_iso_context *context,
739 u32 cycle, size_t header_length, void *header, void *data)
740 {
741 struct fwnet_device *dev;
742 struct fw_iso_packet packet;
743 __be16 *hdr_ptr;
744 __be32 *buf_ptr;
745 int retval;
746 u32 length;
747 u16 source_node_id;
748 u32 specifier_id;
749 u32 ver;
750 unsigned long offset;
751 unsigned long flags;
752
753 dev = data;
754 hdr_ptr = header;
755 length = be16_to_cpup(hdr_ptr);
756
757 spin_lock_irqsave(&dev->lock, flags);
758
759 offset = dev->rcv_buffer_size * dev->broadcast_rcv_next_ptr;
760 buf_ptr = dev->broadcast_rcv_buffer_ptrs[dev->broadcast_rcv_next_ptr++];
761 if (dev->broadcast_rcv_next_ptr == dev->num_broadcast_rcv_ptrs)
762 dev->broadcast_rcv_next_ptr = 0;
763
764 spin_unlock_irqrestore(&dev->lock, flags);
765
766 specifier_id = (be32_to_cpu(buf_ptr[0]) & 0xffff) << 8
767 | (be32_to_cpu(buf_ptr[1]) & 0xff000000) >> 24;
768 ver = be32_to_cpu(buf_ptr[1]) & 0xffffff;
769 source_node_id = be32_to_cpu(buf_ptr[0]) >> 16;
770
771 if (specifier_id == IANA_SPECIFIER_ID &&
772 (ver == RFC2734_SW_VERSION
773 #if IS_ENABLED(CONFIG_IPV6)
774 || ver == RFC3146_SW_VERSION
775 #endif
776 )) {
777 buf_ptr += 2;
778 length -= IEEE1394_GASP_HDR_SIZE;
779 fwnet_incoming_packet(dev, buf_ptr, length, source_node_id,
780 context->card->generation, true);
781 }
782
783 packet.payload_length = dev->rcv_buffer_size;
784 packet.interrupt = 1;
785 packet.skip = 0;
786 packet.tag = 3;
787 packet.sy = 0;
788 packet.header_length = IEEE1394_GASP_HDR_SIZE;
789
790 spin_lock_irqsave(&dev->lock, flags);
791
792 retval = fw_iso_context_queue(dev->broadcast_rcv_context, &packet,
793 &dev->broadcast_rcv_buffer, offset);
794
795 spin_unlock_irqrestore(&dev->lock, flags);
796
797 if (retval >= 0)
798 fw_iso_context_queue_flush(dev->broadcast_rcv_context);
799 else
800 dev_err(&dev->netdev->dev, "requeue failed\n");
801 }
802
803 static struct kmem_cache *fwnet_packet_task_cache;
804
805 static void fwnet_free_ptask(struct fwnet_packet_task *ptask)
806 {
807 dev_kfree_skb_any(ptask->skb);
808 kmem_cache_free(fwnet_packet_task_cache, ptask);
809 }
810
811 /* Caller must hold dev->lock. */
812 static void dec_queued_datagrams(struct fwnet_device *dev)
813 {
814 if (--dev->queued_datagrams == FWNET_MIN_QUEUED_DATAGRAMS)
815 netif_wake_queue(dev->netdev);
816 }
817
818 static int fwnet_send_packet(struct fwnet_packet_task *ptask);
819
820 static void fwnet_transmit_packet_done(struct fwnet_packet_task *ptask)
821 {
822 struct fwnet_device *dev = ptask->dev;
823 struct sk_buff *skb = ptask->skb;
824 unsigned long flags;
825 bool free;
826
827 spin_lock_irqsave(&dev->lock, flags);
828
829 ptask->outstanding_pkts--;
830
831 /* Check whether we or the networking TX soft-IRQ is last user. */
832 free = (ptask->outstanding_pkts == 0 && ptask->enqueued);
833 if (free)
834 dec_queued_datagrams(dev);
835
836 if (ptask->outstanding_pkts == 0) {
837 dev->netdev->stats.tx_packets++;
838 dev->netdev->stats.tx_bytes += skb->len;
839 }
840
841 spin_unlock_irqrestore(&dev->lock, flags);
842
843 if (ptask->outstanding_pkts > 0) {
844 u16 dg_size;
845 u16 fg_off;
846 u16 datagram_label;
847 u16 lf;
848
849 /* Update the ptask to point to the next fragment and send it */
850 lf = fwnet_get_hdr_lf(&ptask->hdr);
851 switch (lf) {
852 case RFC2374_HDR_LASTFRAG:
853 case RFC2374_HDR_UNFRAG:
854 default:
855 dev_err(&dev->netdev->dev,
856 "outstanding packet %x lf %x, header %x,%x\n",
857 ptask->outstanding_pkts, lf, ptask->hdr.w0,
858 ptask->hdr.w1);
859 BUG();
860
861 case RFC2374_HDR_FIRSTFRAG:
862 /* Set frag type here for future interior fragments */
863 dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
864 fg_off = ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
865 datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
866 break;
867
868 case RFC2374_HDR_INTFRAG:
869 dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
870 fg_off = fwnet_get_hdr_fg_off(&ptask->hdr)
871 + ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
872 datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
873 break;
874 }
875
876 if (ptask->dest_node == IEEE1394_ALL_NODES) {
877 skb_pull(skb,
878 ptask->max_payload + IEEE1394_GASP_HDR_SIZE);
879 } else {
880 skb_pull(skb, ptask->max_payload);
881 }
882 if (ptask->outstanding_pkts > 1) {
883 fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_INTFRAG,
884 dg_size, fg_off, datagram_label);
885 } else {
886 fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_LASTFRAG,
887 dg_size, fg_off, datagram_label);
888 ptask->max_payload = skb->len + RFC2374_FRAG_HDR_SIZE;
889 }
890 fwnet_send_packet(ptask);
891 }
892
893 if (free)
894 fwnet_free_ptask(ptask);
895 }
896
897 static void fwnet_transmit_packet_failed(struct fwnet_packet_task *ptask)
898 {
899 struct fwnet_device *dev = ptask->dev;
900 unsigned long flags;
901 bool free;
902
903 spin_lock_irqsave(&dev->lock, flags);
904
905 /* One fragment failed; don't try to send remaining fragments. */
906 ptask->outstanding_pkts = 0;
907
908 /* Check whether we or the networking TX soft-IRQ is last user. */
909 free = ptask->enqueued;
910 if (free)
911 dec_queued_datagrams(dev);
912
913 dev->netdev->stats.tx_dropped++;
914 dev->netdev->stats.tx_errors++;
915
916 spin_unlock_irqrestore(&dev->lock, flags);
917
918 if (free)
919 fwnet_free_ptask(ptask);
920 }
921
922 static void fwnet_write_complete(struct fw_card *card, int rcode,
923 void *payload, size_t length, void *data)
924 {
925 struct fwnet_packet_task *ptask = data;
926 static unsigned long j;
927 static int last_rcode, errors_skipped;
928
929 if (rcode == RCODE_COMPLETE) {
930 fwnet_transmit_packet_done(ptask);
931 } else {
932 if (printk_timed_ratelimit(&j, 1000) || rcode != last_rcode) {
933 dev_err(&ptask->dev->netdev->dev,
934 "fwnet_write_complete failed: %x (skipped %d)\n",
935 rcode, errors_skipped);
936
937 errors_skipped = 0;
938 last_rcode = rcode;
939 } else {
940 errors_skipped++;
941 }
942 fwnet_transmit_packet_failed(ptask);
943 }
944 }
945
946 static int fwnet_send_packet(struct fwnet_packet_task *ptask)
947 {
948 struct fwnet_device *dev;
949 unsigned tx_len;
950 struct rfc2734_header *bufhdr;
951 unsigned long flags;
952 bool free;
953
954 dev = ptask->dev;
955 tx_len = ptask->max_payload;
956 switch (fwnet_get_hdr_lf(&ptask->hdr)) {
957 case RFC2374_HDR_UNFRAG:
958 bufhdr = (struct rfc2734_header *)
959 skb_push(ptask->skb, RFC2374_UNFRAG_HDR_SIZE);
960 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
961 break;
962
963 case RFC2374_HDR_FIRSTFRAG:
964 case RFC2374_HDR_INTFRAG:
965 case RFC2374_HDR_LASTFRAG:
966 bufhdr = (struct rfc2734_header *)
967 skb_push(ptask->skb, RFC2374_FRAG_HDR_SIZE);
968 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
969 put_unaligned_be32(ptask->hdr.w1, &bufhdr->w1);
970 break;
971
972 default:
973 BUG();
974 }
975 if (ptask->dest_node == IEEE1394_ALL_NODES) {
976 u8 *p;
977 int generation;
978 int node_id;
979 unsigned int sw_version;
980
981 /* ptask->generation may not have been set yet */
982 generation = dev->card->generation;
983 smp_rmb();
984 node_id = dev->card->node_id;
985
986 switch (ptask->skb->protocol) {
987 default:
988 sw_version = RFC2734_SW_VERSION;
989 break;
990 #if IS_ENABLED(CONFIG_IPV6)
991 case htons(ETH_P_IPV6):
992 sw_version = RFC3146_SW_VERSION;
993 #endif
994 }
995
996 p = skb_push(ptask->skb, IEEE1394_GASP_HDR_SIZE);
997 put_unaligned_be32(node_id << 16 | IANA_SPECIFIER_ID >> 8, p);
998 put_unaligned_be32((IANA_SPECIFIER_ID & 0xff) << 24
999 | sw_version, &p[4]);
1000
1001 /* We should not transmit if broadcast_channel.valid == 0. */
1002 fw_send_request(dev->card, &ptask->transaction,
1003 TCODE_STREAM_DATA,
1004 fw_stream_packet_destination_id(3,
1005 IEEE1394_BROADCAST_CHANNEL, 0),
1006 generation, SCODE_100, 0ULL, ptask->skb->data,
1007 tx_len + 8, fwnet_write_complete, ptask);
1008
1009 spin_lock_irqsave(&dev->lock, flags);
1010
1011 /* If the AT tasklet already ran, we may be last user. */
1012 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1013 if (!free)
1014 ptask->enqueued = true;
1015 else
1016 dec_queued_datagrams(dev);
1017
1018 spin_unlock_irqrestore(&dev->lock, flags);
1019
1020 goto out;
1021 }
1022
1023 fw_send_request(dev->card, &ptask->transaction,
1024 TCODE_WRITE_BLOCK_REQUEST, ptask->dest_node,
1025 ptask->generation, ptask->speed, ptask->fifo_addr,
1026 ptask->skb->data, tx_len, fwnet_write_complete, ptask);
1027
1028 spin_lock_irqsave(&dev->lock, flags);
1029
1030 /* If the AT tasklet already ran, we may be last user. */
1031 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1032 if (!free)
1033 ptask->enqueued = true;
1034 else
1035 dec_queued_datagrams(dev);
1036
1037 spin_unlock_irqrestore(&dev->lock, flags);
1038
1039 dev->netdev->trans_start = jiffies;
1040 out:
1041 if (free)
1042 fwnet_free_ptask(ptask);
1043
1044 return 0;
1045 }
1046
1047 static void fwnet_fifo_stop(struct fwnet_device *dev)
1048 {
1049 if (dev->local_fifo == FWNET_NO_FIFO_ADDR)
1050 return;
1051
1052 fw_core_remove_address_handler(&dev->handler);
1053 dev->local_fifo = FWNET_NO_FIFO_ADDR;
1054 }
1055
1056 static int fwnet_fifo_start(struct fwnet_device *dev)
1057 {
1058 int retval;
1059
1060 if (dev->local_fifo != FWNET_NO_FIFO_ADDR)
1061 return 0;
1062
1063 dev->handler.length = 4096;
1064 dev->handler.address_callback = fwnet_receive_packet;
1065 dev->handler.callback_data = dev;
1066
1067 retval = fw_core_add_address_handler(&dev->handler,
1068 &fw_high_memory_region);
1069 if (retval < 0)
1070 return retval;
1071
1072 dev->local_fifo = dev->handler.offset;
1073
1074 return 0;
1075 }
1076
1077 static void __fwnet_broadcast_stop(struct fwnet_device *dev)
1078 {
1079 unsigned u;
1080
1081 if (dev->broadcast_state != FWNET_BROADCAST_ERROR) {
1082 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++)
1083 kunmap(dev->broadcast_rcv_buffer.pages[u]);
1084 fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer, dev->card);
1085 }
1086 if (dev->broadcast_rcv_context) {
1087 fw_iso_context_destroy(dev->broadcast_rcv_context);
1088 dev->broadcast_rcv_context = NULL;
1089 }
1090 kfree(dev->broadcast_rcv_buffer_ptrs);
1091 dev->broadcast_rcv_buffer_ptrs = NULL;
1092 dev->broadcast_state = FWNET_BROADCAST_ERROR;
1093 }
1094
1095 static void fwnet_broadcast_stop(struct fwnet_device *dev)
1096 {
1097 if (dev->broadcast_state == FWNET_BROADCAST_ERROR)
1098 return;
1099 fw_iso_context_stop(dev->broadcast_rcv_context);
1100 __fwnet_broadcast_stop(dev);
1101 }
1102
1103 static int fwnet_broadcast_start(struct fwnet_device *dev)
1104 {
1105 struct fw_iso_context *context;
1106 int retval;
1107 unsigned num_packets;
1108 unsigned max_receive;
1109 struct fw_iso_packet packet;
1110 unsigned long offset;
1111 void **ptrptr;
1112 unsigned u;
1113
1114 if (dev->broadcast_state != FWNET_BROADCAST_ERROR)
1115 return 0;
1116
1117 max_receive = 1U << (dev->card->max_receive + 1);
1118 num_packets = (FWNET_ISO_PAGE_COUNT * PAGE_SIZE) / max_receive;
1119
1120 ptrptr = kmalloc(sizeof(void *) * num_packets, GFP_KERNEL);
1121 if (!ptrptr) {
1122 retval = -ENOMEM;
1123 goto failed;
1124 }
1125 dev->broadcast_rcv_buffer_ptrs = ptrptr;
1126
1127 context = fw_iso_context_create(dev->card, FW_ISO_CONTEXT_RECEIVE,
1128 IEEE1394_BROADCAST_CHANNEL,
1129 dev->card->link_speed, 8,
1130 fwnet_receive_broadcast, dev);
1131 if (IS_ERR(context)) {
1132 retval = PTR_ERR(context);
1133 goto failed;
1134 }
1135
1136 retval = fw_iso_buffer_init(&dev->broadcast_rcv_buffer, dev->card,
1137 FWNET_ISO_PAGE_COUNT, DMA_FROM_DEVICE);
1138 if (retval < 0)
1139 goto failed;
1140
1141 dev->broadcast_state = FWNET_BROADCAST_STOPPED;
1142
1143 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++) {
1144 void *ptr;
1145 unsigned v;
1146
1147 ptr = kmap(dev->broadcast_rcv_buffer.pages[u]);
1148 for (v = 0; v < num_packets / FWNET_ISO_PAGE_COUNT; v++)
1149 *ptrptr++ = (void *) ((char *)ptr + v * max_receive);
1150 }
1151 dev->broadcast_rcv_context = context;
1152
1153 packet.payload_length = max_receive;
1154 packet.interrupt = 1;
1155 packet.skip = 0;
1156 packet.tag = 3;
1157 packet.sy = 0;
1158 packet.header_length = IEEE1394_GASP_HDR_SIZE;
1159 offset = 0;
1160
1161 for (u = 0; u < num_packets; u++) {
1162 retval = fw_iso_context_queue(context, &packet,
1163 &dev->broadcast_rcv_buffer, offset);
1164 if (retval < 0)
1165 goto failed;
1166
1167 offset += max_receive;
1168 }
1169 dev->num_broadcast_rcv_ptrs = num_packets;
1170 dev->rcv_buffer_size = max_receive;
1171 dev->broadcast_rcv_next_ptr = 0U;
1172 retval = fw_iso_context_start(context, -1, 0,
1173 FW_ISO_CONTEXT_MATCH_ALL_TAGS); /* ??? sync */
1174 if (retval < 0)
1175 goto failed;
1176
1177 /* FIXME: adjust it according to the min. speed of all known peers? */
1178 dev->broadcast_xmt_max_payload = IEEE1394_MAX_PAYLOAD_S100
1179 - IEEE1394_GASP_HDR_SIZE - RFC2374_UNFRAG_HDR_SIZE;
1180 dev->broadcast_state = FWNET_BROADCAST_RUNNING;
1181
1182 return 0;
1183
1184 failed:
1185 __fwnet_broadcast_stop(dev);
1186 return retval;
1187 }
1188
1189 static void set_carrier_state(struct fwnet_device *dev)
1190 {
1191 if (dev->peer_count > 1)
1192 netif_carrier_on(dev->netdev);
1193 else
1194 netif_carrier_off(dev->netdev);
1195 }
1196
1197 /* ifup */
1198 static int fwnet_open(struct net_device *net)
1199 {
1200 struct fwnet_device *dev = netdev_priv(net);
1201 int ret;
1202
1203 ret = fwnet_broadcast_start(dev);
1204 if (ret)
1205 return ret;
1206
1207 netif_start_queue(net);
1208
1209 spin_lock_irq(&dev->lock);
1210 set_carrier_state(dev);
1211 spin_unlock_irq(&dev->lock);
1212
1213 return 0;
1214 }
1215
1216 /* ifdown */
1217 static int fwnet_stop(struct net_device *net)
1218 {
1219 struct fwnet_device *dev = netdev_priv(net);
1220
1221 netif_stop_queue(net);
1222 fwnet_broadcast_stop(dev);
1223
1224 return 0;
1225 }
1226
1227 static netdev_tx_t fwnet_tx(struct sk_buff *skb, struct net_device *net)
1228 {
1229 struct fwnet_header hdr_buf;
1230 struct fwnet_device *dev = netdev_priv(net);
1231 __be16 proto;
1232 u16 dest_node;
1233 unsigned max_payload;
1234 u16 dg_size;
1235 u16 *datagram_label_ptr;
1236 struct fwnet_packet_task *ptask;
1237 struct fwnet_peer *peer;
1238 unsigned long flags;
1239
1240 spin_lock_irqsave(&dev->lock, flags);
1241
1242 /* Can this happen? */
1243 if (netif_queue_stopped(dev->netdev)) {
1244 spin_unlock_irqrestore(&dev->lock, flags);
1245
1246 return NETDEV_TX_BUSY;
1247 }
1248
1249 ptask = kmem_cache_alloc(fwnet_packet_task_cache, GFP_ATOMIC);
1250 if (ptask == NULL)
1251 goto fail;
1252
1253 skb = skb_share_check(skb, GFP_ATOMIC);
1254 if (!skb)
1255 goto fail;
1256
1257 /*
1258 * Make a copy of the driver-specific header.
1259 * We might need to rebuild the header on tx failure.
1260 */
1261 memcpy(&hdr_buf, skb->data, sizeof(hdr_buf));
1262 proto = hdr_buf.h_proto;
1263
1264 switch (proto) {
1265 case htons(ETH_P_ARP):
1266 case htons(ETH_P_IP):
1267 #if IS_ENABLED(CONFIG_IPV6)
1268 case htons(ETH_P_IPV6):
1269 #endif
1270 break;
1271 default:
1272 goto fail;
1273 }
1274
1275 skb_pull(skb, sizeof(hdr_buf));
1276 dg_size = skb->len;
1277
1278 /*
1279 * Set the transmission type for the packet. ARP packets and IP
1280 * broadcast packets are sent via GASP.
1281 */
1282 if (fwnet_hwaddr_is_multicast(hdr_buf.h_dest)) {
1283 max_payload = dev->broadcast_xmt_max_payload;
1284 datagram_label_ptr = &dev->broadcast_xmt_datagramlabel;
1285
1286 ptask->fifo_addr = FWNET_NO_FIFO_ADDR;
1287 ptask->generation = 0;
1288 ptask->dest_node = IEEE1394_ALL_NODES;
1289 ptask->speed = SCODE_100;
1290 } else {
1291 union fwnet_hwaddr *ha = (union fwnet_hwaddr *)hdr_buf.h_dest;
1292 __be64 guid = get_unaligned(&ha->uc.uniq_id);
1293 u8 generation;
1294
1295 peer = fwnet_peer_find_by_guid(dev, be64_to_cpu(guid));
1296 if (!peer)
1297 goto fail;
1298
1299 generation = peer->generation;
1300 dest_node = peer->node_id;
1301 max_payload = peer->max_payload;
1302 datagram_label_ptr = &peer->datagram_label;
1303
1304 ptask->fifo_addr = fwnet_hwaddr_fifo(ha);
1305 ptask->generation = generation;
1306 ptask->dest_node = dest_node;
1307 ptask->speed = peer->speed;
1308 }
1309
1310 ptask->hdr.w0 = 0;
1311 ptask->hdr.w1 = 0;
1312 ptask->skb = skb;
1313 ptask->dev = dev;
1314
1315 /* Does it all fit in one packet? */
1316 if (dg_size <= max_payload) {
1317 fwnet_make_uf_hdr(&ptask->hdr, ntohs(proto));
1318 ptask->outstanding_pkts = 1;
1319 max_payload = dg_size + RFC2374_UNFRAG_HDR_SIZE;
1320 } else {
1321 u16 datagram_label;
1322
1323 max_payload -= RFC2374_FRAG_OVERHEAD;
1324 datagram_label = (*datagram_label_ptr)++;
1325 fwnet_make_ff_hdr(&ptask->hdr, ntohs(proto), dg_size,
1326 datagram_label);
1327 ptask->outstanding_pkts = DIV_ROUND_UP(dg_size, max_payload);
1328 max_payload += RFC2374_FRAG_HDR_SIZE;
1329 }
1330
1331 if (++dev->queued_datagrams == FWNET_MAX_QUEUED_DATAGRAMS)
1332 netif_stop_queue(dev->netdev);
1333
1334 spin_unlock_irqrestore(&dev->lock, flags);
1335
1336 ptask->max_payload = max_payload;
1337 ptask->enqueued = 0;
1338
1339 fwnet_send_packet(ptask);
1340
1341 return NETDEV_TX_OK;
1342
1343 fail:
1344 spin_unlock_irqrestore(&dev->lock, flags);
1345
1346 if (ptask)
1347 kmem_cache_free(fwnet_packet_task_cache, ptask);
1348
1349 if (skb != NULL)
1350 dev_kfree_skb(skb);
1351
1352 net->stats.tx_dropped++;
1353 net->stats.tx_errors++;
1354
1355 /*
1356 * FIXME: According to a patch from 2003-02-26, "returning non-zero
1357 * causes serious problems" here, allegedly. Before that patch,
1358 * -ERRNO was returned which is not appropriate under Linux 2.6.
1359 * Perhaps more needs to be done? Stop the queue in serious
1360 * conditions and restart it elsewhere?
1361 */
1362 return NETDEV_TX_OK;
1363 }
1364
1365 static int fwnet_change_mtu(struct net_device *net, int new_mtu)
1366 {
1367 if (new_mtu < 68)
1368 return -EINVAL;
1369
1370 net->mtu = new_mtu;
1371 return 0;
1372 }
1373
1374 static const struct ethtool_ops fwnet_ethtool_ops = {
1375 .get_link = ethtool_op_get_link,
1376 };
1377
1378 static const struct net_device_ops fwnet_netdev_ops = {
1379 .ndo_open = fwnet_open,
1380 .ndo_stop = fwnet_stop,
1381 .ndo_start_xmit = fwnet_tx,
1382 .ndo_change_mtu = fwnet_change_mtu,
1383 };
1384
1385 static void fwnet_init_dev(struct net_device *net)
1386 {
1387 net->header_ops = &fwnet_header_ops;
1388 net->netdev_ops = &fwnet_netdev_ops;
1389 net->watchdog_timeo = 2 * HZ;
1390 net->flags = IFF_BROADCAST | IFF_MULTICAST;
1391 net->features = NETIF_F_HIGHDMA;
1392 net->addr_len = FWNET_ALEN;
1393 net->hard_header_len = FWNET_HLEN;
1394 net->type = ARPHRD_IEEE1394;
1395 net->tx_queue_len = FWNET_TX_QUEUE_LEN;
1396 net->ethtool_ops = &fwnet_ethtool_ops;
1397 }
1398
1399 /* caller must hold fwnet_device_mutex */
1400 static struct fwnet_device *fwnet_dev_find(struct fw_card *card)
1401 {
1402 struct fwnet_device *dev;
1403
1404 list_for_each_entry(dev, &fwnet_device_list, dev_link)
1405 if (dev->card == card)
1406 return dev;
1407
1408 return NULL;
1409 }
1410
1411 static int fwnet_add_peer(struct fwnet_device *dev,
1412 struct fw_unit *unit, struct fw_device *device)
1413 {
1414 struct fwnet_peer *peer;
1415
1416 peer = kmalloc(sizeof(*peer), GFP_KERNEL);
1417 if (!peer)
1418 return -ENOMEM;
1419
1420 dev_set_drvdata(&unit->device, peer);
1421
1422 peer->dev = dev;
1423 peer->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4];
1424 INIT_LIST_HEAD(&peer->pd_list);
1425 peer->pdg_size = 0;
1426 peer->datagram_label = 0;
1427 peer->speed = device->max_speed;
1428 peer->max_payload = fwnet_max_payload(device->max_rec, peer->speed);
1429
1430 peer->generation = device->generation;
1431 smp_rmb();
1432 peer->node_id = device->node_id;
1433
1434 spin_lock_irq(&dev->lock);
1435 list_add_tail(&peer->peer_link, &dev->peer_list);
1436 dev->peer_count++;
1437 set_carrier_state(dev);
1438 spin_unlock_irq(&dev->lock);
1439
1440 return 0;
1441 }
1442
1443 static int fwnet_probe(struct fw_unit *unit,
1444 const struct ieee1394_device_id *id)
1445 {
1446 struct fw_device *device = fw_parent_device(unit);
1447 struct fw_card *card = device->card;
1448 struct net_device *net;
1449 bool allocated_netdev = false;
1450 struct fwnet_device *dev;
1451 unsigned max_mtu;
1452 int ret;
1453 union fwnet_hwaddr *ha;
1454
1455 mutex_lock(&fwnet_device_mutex);
1456
1457 dev = fwnet_dev_find(card);
1458 if (dev) {
1459 net = dev->netdev;
1460 goto have_dev;
1461 }
1462
1463 net = alloc_netdev(sizeof(*dev), "firewire%d", fwnet_init_dev);
1464 if (net == NULL) {
1465 ret = -ENOMEM;
1466 goto out;
1467 }
1468
1469 allocated_netdev = true;
1470 SET_NETDEV_DEV(net, card->device);
1471 dev = netdev_priv(net);
1472
1473 spin_lock_init(&dev->lock);
1474 dev->broadcast_state = FWNET_BROADCAST_ERROR;
1475 dev->broadcast_rcv_context = NULL;
1476 dev->broadcast_xmt_max_payload = 0;
1477 dev->broadcast_xmt_datagramlabel = 0;
1478 dev->local_fifo = FWNET_NO_FIFO_ADDR;
1479 dev->queued_datagrams = 0;
1480 INIT_LIST_HEAD(&dev->peer_list);
1481 dev->card = card;
1482 dev->netdev = net;
1483
1484 ret = fwnet_fifo_start(dev);
1485 if (ret < 0)
1486 goto out;
1487 dev->local_fifo = dev->handler.offset;
1488
1489 /*
1490 * Use the RFC 2734 default 1500 octets or the maximum payload
1491 * as initial MTU
1492 */
1493 max_mtu = (1 << (card->max_receive + 1))
1494 - sizeof(struct rfc2734_header) - IEEE1394_GASP_HDR_SIZE;
1495 net->mtu = min(1500U, max_mtu);
1496
1497 /* Set our hardware address while we're at it */
1498 ha = (union fwnet_hwaddr *)net->dev_addr;
1499 put_unaligned_be64(card->guid, &ha->uc.uniq_id);
1500 ha->uc.max_rec = dev->card->max_receive;
1501 ha->uc.sspd = dev->card->link_speed;
1502 put_unaligned_be16(dev->local_fifo >> 32, &ha->uc.fifo_hi);
1503 put_unaligned_be32(dev->local_fifo & 0xffffffff, &ha->uc.fifo_lo);
1504
1505 memset(net->broadcast, -1, net->addr_len);
1506
1507 ret = register_netdev(net);
1508 if (ret)
1509 goto out;
1510
1511 list_add_tail(&dev->dev_link, &fwnet_device_list);
1512 dev_notice(&net->dev, "IP over IEEE 1394 on card %s\n",
1513 dev_name(card->device));
1514 have_dev:
1515 ret = fwnet_add_peer(dev, unit, device);
1516 if (ret && allocated_netdev) {
1517 unregister_netdev(net);
1518 list_del(&dev->dev_link);
1519 out:
1520 fwnet_fifo_stop(dev);
1521 free_netdev(net);
1522 }
1523
1524 mutex_unlock(&fwnet_device_mutex);
1525
1526 return ret;
1527 }
1528
1529 /*
1530 * FIXME abort partially sent fragmented datagrams,
1531 * discard partially received fragmented datagrams
1532 */
1533 static void fwnet_update(struct fw_unit *unit)
1534 {
1535 struct fw_device *device = fw_parent_device(unit);
1536 struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1537 int generation;
1538
1539 generation = device->generation;
1540
1541 spin_lock_irq(&peer->dev->lock);
1542 peer->node_id = device->node_id;
1543 peer->generation = generation;
1544 spin_unlock_irq(&peer->dev->lock);
1545 }
1546
1547 static void fwnet_remove_peer(struct fwnet_peer *peer, struct fwnet_device *dev)
1548 {
1549 struct fwnet_partial_datagram *pd, *pd_next;
1550
1551 spin_lock_irq(&dev->lock);
1552 list_del(&peer->peer_link);
1553 dev->peer_count--;
1554 set_carrier_state(dev);
1555 spin_unlock_irq(&dev->lock);
1556
1557 list_for_each_entry_safe(pd, pd_next, &peer->pd_list, pd_link)
1558 fwnet_pd_delete(pd);
1559
1560 kfree(peer);
1561 }
1562
1563 static void fwnet_remove(struct fw_unit *unit)
1564 {
1565 struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1566 struct fwnet_device *dev = peer->dev;
1567 struct net_device *net;
1568 int i;
1569
1570 mutex_lock(&fwnet_device_mutex);
1571
1572 net = dev->netdev;
1573
1574 fwnet_remove_peer(peer, dev);
1575
1576 if (list_empty(&dev->peer_list)) {
1577 unregister_netdev(net);
1578
1579 fwnet_fifo_stop(dev);
1580
1581 for (i = 0; dev->queued_datagrams && i < 5; i++)
1582 ssleep(1);
1583 WARN_ON(dev->queued_datagrams);
1584 list_del(&dev->dev_link);
1585
1586 free_netdev(net);
1587 }
1588
1589 mutex_unlock(&fwnet_device_mutex);
1590 }
1591
1592 static const struct ieee1394_device_id fwnet_id_table[] = {
1593 {
1594 .match_flags = IEEE1394_MATCH_SPECIFIER_ID |
1595 IEEE1394_MATCH_VERSION,
1596 .specifier_id = IANA_SPECIFIER_ID,
1597 .version = RFC2734_SW_VERSION,
1598 },
1599 #if IS_ENABLED(CONFIG_IPV6)
1600 {
1601 .match_flags = IEEE1394_MATCH_SPECIFIER_ID |
1602 IEEE1394_MATCH_VERSION,
1603 .specifier_id = IANA_SPECIFIER_ID,
1604 .version = RFC3146_SW_VERSION,
1605 },
1606 #endif
1607 { }
1608 };
1609
1610 static struct fw_driver fwnet_driver = {
1611 .driver = {
1612 .owner = THIS_MODULE,
1613 .name = KBUILD_MODNAME,
1614 .bus = &fw_bus_type,
1615 },
1616 .probe = fwnet_probe,
1617 .update = fwnet_update,
1618 .remove = fwnet_remove,
1619 .id_table = fwnet_id_table,
1620 };
1621
1622 static const u32 rfc2374_unit_directory_data[] = {
1623 0x00040000, /* directory_length */
1624 0x1200005e, /* unit_specifier_id: IANA */
1625 0x81000003, /* textual descriptor offset */
1626 0x13000001, /* unit_sw_version: RFC 2734 */
1627 0x81000005, /* textual descriptor offset */
1628 0x00030000, /* descriptor_length */
1629 0x00000000, /* text */
1630 0x00000000, /* minimal ASCII, en */
1631 0x49414e41, /* I A N A */
1632 0x00030000, /* descriptor_length */
1633 0x00000000, /* text */
1634 0x00000000, /* minimal ASCII, en */
1635 0x49507634, /* I P v 4 */
1636 };
1637
1638 static struct fw_descriptor rfc2374_unit_directory = {
1639 .length = ARRAY_SIZE(rfc2374_unit_directory_data),
1640 .key = (CSR_DIRECTORY | CSR_UNIT) << 24,
1641 .data = rfc2374_unit_directory_data
1642 };
1643
1644 #if IS_ENABLED(CONFIG_IPV6)
1645 static const u32 rfc3146_unit_directory_data[] = {
1646 0x00040000, /* directory_length */
1647 0x1200005e, /* unit_specifier_id: IANA */
1648 0x81000003, /* textual descriptor offset */
1649 0x13000002, /* unit_sw_version: RFC 3146 */
1650 0x81000005, /* textual descriptor offset */
1651 0x00030000, /* descriptor_length */
1652 0x00000000, /* text */
1653 0x00000000, /* minimal ASCII, en */
1654 0x49414e41, /* I A N A */
1655 0x00030000, /* descriptor_length */
1656 0x00000000, /* text */
1657 0x00000000, /* minimal ASCII, en */
1658 0x49507636, /* I P v 6 */
1659 };
1660
1661 static struct fw_descriptor rfc3146_unit_directory = {
1662 .length = ARRAY_SIZE(rfc3146_unit_directory_data),
1663 .key = (CSR_DIRECTORY | CSR_UNIT) << 24,
1664 .data = rfc3146_unit_directory_data
1665 };
1666 #endif
1667
1668 static int __init fwnet_init(void)
1669 {
1670 int err;
1671
1672 err = fw_core_add_descriptor(&rfc2374_unit_directory);
1673 if (err)
1674 return err;
1675
1676 #if IS_ENABLED(CONFIG_IPV6)
1677 err = fw_core_add_descriptor(&rfc3146_unit_directory);
1678 if (err)
1679 goto out;
1680 #endif
1681
1682 fwnet_packet_task_cache = kmem_cache_create("packet_task",
1683 sizeof(struct fwnet_packet_task), 0, 0, NULL);
1684 if (!fwnet_packet_task_cache) {
1685 err = -ENOMEM;
1686 goto out2;
1687 }
1688
1689 err = driver_register(&fwnet_driver.driver);
1690 if (!err)
1691 return 0;
1692
1693 kmem_cache_destroy(fwnet_packet_task_cache);
1694 out2:
1695 #if IS_ENABLED(CONFIG_IPV6)
1696 fw_core_remove_descriptor(&rfc3146_unit_directory);
1697 out:
1698 #endif
1699 fw_core_remove_descriptor(&rfc2374_unit_directory);
1700
1701 return err;
1702 }
1703 module_init(fwnet_init);
1704
1705 static void __exit fwnet_cleanup(void)
1706 {
1707 driver_unregister(&fwnet_driver.driver);
1708 kmem_cache_destroy(fwnet_packet_task_cache);
1709 #if IS_ENABLED(CONFIG_IPV6)
1710 fw_core_remove_descriptor(&rfc3146_unit_directory);
1711 #endif
1712 fw_core_remove_descriptor(&rfc2374_unit_directory);
1713 }
1714 module_exit(fwnet_cleanup);
1715
1716 MODULE_AUTHOR("Jay Fenlason <fenlason@redhat.com>");
1717 MODULE_DESCRIPTION("IP over IEEE1394 as per RFC 2734/3146");
1718 MODULE_LICENSE("GPL");
1719 MODULE_DEVICE_TABLE(ieee1394, fwnet_id_table);
Linux with added FPC-III support