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Linux 3.18.86
[linux/fpc-iii.git] / drivers / firewire / net.c
blobe7a085acf72d95f20bb6199f99ec645e0aef302e
1 /*
2 * IPv4 over IEEE 1394, per RFC 2734
3 * IPv6 over IEEE 1394, per RFC 3146
4 *
5 * Copyright (C) 2009 Jay Fenlason <fenlason@redhat.com>
6 *
7 * based on eth1394 by Ben Collins et al
8 */
9
10 #include <linux/bug.h>
11 #include <linux/compiler.h>
12 #include <linux/delay.h>
13 #include <linux/device.h>
14 #include <linux/ethtool.h>
15 #include <linux/firewire.h>
16 #include <linux/firewire-constants.h>
17 #include <linux/highmem.h>
18 #include <linux/in.h>
19 #include <linux/ip.h>
20 #include <linux/jiffies.h>
21 #include <linux/mod_devicetable.h>
22 #include <linux/module.h>
23 #include <linux/moduleparam.h>
24 #include <linux/mutex.h>
25 #include <linux/netdevice.h>
26 #include <linux/skbuff.h>
27 #include <linux/slab.h>
28 #include <linux/spinlock.h>
29
30 #include <asm/unaligned.h>
31 #include <net/arp.h>
32 #include <net/firewire.h>
33
34 /* rx limits */
35 #define FWNET_MAX_FRAGMENTS 30 /* arbitrary, > TX queue depth */
36 #define FWNET_ISO_PAGE_COUNT (PAGE_SIZE < 16*1024 ? 4 : 2)
37
38 /* tx limits */
39 #define FWNET_MAX_QUEUED_DATAGRAMS 20 /* < 64 = number of tlabels */
40 #define FWNET_MIN_QUEUED_DATAGRAMS 10 /* should keep AT DMA busy enough */
41 #define FWNET_TX_QUEUE_LEN FWNET_MAX_QUEUED_DATAGRAMS /* ? */
42
43 #define IEEE1394_BROADCAST_CHANNEL 31
44 #define IEEE1394_ALL_NODES (0xffc0 | 0x003f)
45 #define IEEE1394_MAX_PAYLOAD_S100 512
46 #define FWNET_NO_FIFO_ADDR (~0ULL)
47
48 #define IANA_SPECIFIER_ID 0x00005eU
49 #define RFC2734_SW_VERSION 0x000001U
50 #define RFC3146_SW_VERSION 0x000002U
51
52 #define IEEE1394_GASP_HDR_SIZE 8
53
54 #define RFC2374_UNFRAG_HDR_SIZE 4
55 #define RFC2374_FRAG_HDR_SIZE 8
56 #define RFC2374_FRAG_OVERHEAD 4
57
58 #define RFC2374_HDR_UNFRAG 0 /* unfragmented */
59 #define RFC2374_HDR_FIRSTFRAG 1 /* first fragment */
60 #define RFC2374_HDR_LASTFRAG 2 /* last fragment */
61 #define RFC2374_HDR_INTFRAG 3 /* interior fragment */
62
63 static bool fwnet_hwaddr_is_multicast(u8 *ha)
64 {
65 return !!(*ha & 1);
66 }
67
68 /* IPv4 and IPv6 encapsulation header */
69 struct rfc2734_header {
70 u32 w0;
71 u32 w1;
72 };
73
74 #define fwnet_get_hdr_lf(h) (((h)->w0 & 0xc0000000) >> 30)
75 #define fwnet_get_hdr_ether_type(h) (((h)->w0 & 0x0000ffff))
76 #define fwnet_get_hdr_dg_size(h) ((((h)->w0 & 0x0fff0000) >> 16) + 1)
77 #define fwnet_get_hdr_fg_off(h) (((h)->w0 & 0x00000fff))
78 #define fwnet_get_hdr_dgl(h) (((h)->w1 & 0xffff0000) >> 16)
79
80 #define fwnet_set_hdr_lf(lf) ((lf) << 30)
81 #define fwnet_set_hdr_ether_type(et) (et)
82 #define fwnet_set_hdr_dg_size(dgs) (((dgs) - 1) << 16)
83 #define fwnet_set_hdr_fg_off(fgo) (fgo)
84
85 #define fwnet_set_hdr_dgl(dgl) ((dgl) << 16)
86
87 static inline void fwnet_make_uf_hdr(struct rfc2734_header *hdr,
88 unsigned ether_type)
89 {
90 hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_UNFRAG)
91 | fwnet_set_hdr_ether_type(ether_type);
92 }
93
94 static inline void fwnet_make_ff_hdr(struct rfc2734_header *hdr,
95 unsigned ether_type, unsigned dg_size, unsigned dgl)
96 {
97 hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_FIRSTFRAG)
98 | fwnet_set_hdr_dg_size(dg_size)
99 | fwnet_set_hdr_ether_type(ether_type);
100 hdr->w1 = fwnet_set_hdr_dgl(dgl);
101 }
102
103 static inline void fwnet_make_sf_hdr(struct rfc2734_header *hdr,
104 unsigned lf, unsigned dg_size, unsigned fg_off, unsigned dgl)
105 {
106 hdr->w0 = fwnet_set_hdr_lf(lf)
107 | fwnet_set_hdr_dg_size(dg_size)
108 | fwnet_set_hdr_fg_off(fg_off);
109 hdr->w1 = fwnet_set_hdr_dgl(dgl);
110 }
111
112 /* This list keeps track of what parts of the datagram have been filled in */
113 struct fwnet_fragment_info {
114 struct list_head fi_link;
115 u16 offset;
116 u16 len;
117 };
118
119 struct fwnet_partial_datagram {
120 struct list_head pd_link;
121 struct list_head fi_list;
122 struct sk_buff *skb;
123 /* FIXME Why not use skb->data? */
124 char *pbuf;
125 u16 datagram_label;
126 u16 ether_type;
127 u16 datagram_size;
128 };
129
130 static DEFINE_MUTEX(fwnet_device_mutex);
131 static LIST_HEAD(fwnet_device_list);
132
133 struct fwnet_device {
134 struct list_head dev_link;
135 spinlock_t lock;
136 enum {
137 FWNET_BROADCAST_ERROR,
138 FWNET_BROADCAST_RUNNING,
139 FWNET_BROADCAST_STOPPED,
140 } broadcast_state;
141 struct fw_iso_context *broadcast_rcv_context;
142 struct fw_iso_buffer broadcast_rcv_buffer;
143 void **broadcast_rcv_buffer_ptrs;
144 unsigned broadcast_rcv_next_ptr;
145 unsigned num_broadcast_rcv_ptrs;
146 unsigned rcv_buffer_size;
147 /*
148 * This value is the maximum unfragmented datagram size that can be
149 * sent by the hardware. It already has the GASP overhead and the
150 * unfragmented datagram header overhead calculated into it.
151 */
152 unsigned broadcast_xmt_max_payload;
153 u16 broadcast_xmt_datagramlabel;
154
155 /*
156 * The CSR address that remote nodes must send datagrams to for us to
157 * receive them.
158 */
159 struct fw_address_handler handler;
160 u64 local_fifo;
161
162 /* Number of tx datagrams that have been queued but not yet acked */
163 int queued_datagrams;
164
165 int peer_count;
166 struct list_head peer_list;
167 struct fw_card *card;
168 struct net_device *netdev;
169 };
170
171 struct fwnet_peer {
172 struct list_head peer_link;
173 struct fwnet_device *dev;
174 u64 guid;
175
176 /* guarded by dev->lock */
177 struct list_head pd_list; /* received partial datagrams */
178 unsigned pdg_size; /* pd_list size */
179
180 u16 datagram_label; /* outgoing datagram label */
181 u16 max_payload; /* includes RFC2374_FRAG_HDR_SIZE overhead */
182 int node_id;
183 int generation;
184 unsigned speed;
185 };
186
187 /* This is our task struct. It's used for the packet complete callback. */
188 struct fwnet_packet_task {
189 struct fw_transaction transaction;
190 struct rfc2734_header hdr;
191 struct sk_buff *skb;
192 struct fwnet_device *dev;
193
194 int outstanding_pkts;
195 u64 fifo_addr;
196 u16 dest_node;
197 u16 max_payload;
198 u8 generation;
199 u8 speed;
200 u8 enqueued;
201 };
202
203 /*
204 * Get fifo address embedded in hwaddr
205 */
206 static __u64 fwnet_hwaddr_fifo(union fwnet_hwaddr *ha)
207 {
208 return (u64)get_unaligned_be16(&ha->uc.fifo_hi) << 32
209 | get_unaligned_be32(&ha->uc.fifo_lo);
210 }
211
212 /*
213 * saddr == NULL means use device source address.
214 * daddr == NULL means leave destination address (eg unresolved arp).
215 */
216 static int fwnet_header_create(struct sk_buff *skb, struct net_device *net,
217 unsigned short type, const void *daddr,
218 const void *saddr, unsigned len)
219 {
220 struct fwnet_header *h;
221
222 h = (struct fwnet_header *)skb_push(skb, sizeof(*h));
223 put_unaligned_be16(type, &h->h_proto);
224
225 if (net->flags & (IFF_LOOPBACK | IFF_NOARP)) {
226 memset(h->h_dest, 0, net->addr_len);
227
228 return net->hard_header_len;
229 }
230
231 if (daddr) {
232 memcpy(h->h_dest, daddr, net->addr_len);
233
234 return net->hard_header_len;
235 }
236
237 return -net->hard_header_len;
238 }
239
240 static int fwnet_header_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 if (len <= RFC2374_UNFRAG_HDR_SIZE)
595 return 0;
596
597 hdr.w0 = be32_to_cpu(buf[0]);
598 lf = fwnet_get_hdr_lf(&hdr);
599 if (lf == RFC2374_HDR_UNFRAG) {
600 /*
601 * An unfragmented datagram has been received by the ieee1394
602 * bus. Build an skbuff around it so we can pass it to the
603 * high level network layer.
604 */
605 ether_type = fwnet_get_hdr_ether_type(&hdr);
606 buf++;
607 len -= RFC2374_UNFRAG_HDR_SIZE;
608
609 skb = dev_alloc_skb(len + LL_RESERVED_SPACE(net));
610 if (unlikely(!skb)) {
611 net->stats.rx_dropped++;
612
613 return -ENOMEM;
614 }
615 skb_reserve(skb, LL_RESERVED_SPACE(net));
616 memcpy(skb_put(skb, len), buf, len);
617
618 return fwnet_finish_incoming_packet(net, skb, source_node_id,
619 is_broadcast, ether_type);
620 }
621
622 /* A datagram fragment has been received, now the fun begins. */
623
624 if (len <= RFC2374_FRAG_HDR_SIZE)
625 return 0;
626
627 hdr.w1 = ntohl(buf[1]);
628 buf += 2;
629 len -= RFC2374_FRAG_HDR_SIZE;
630 if (lf == RFC2374_HDR_FIRSTFRAG) {
631 ether_type = fwnet_get_hdr_ether_type(&hdr);
632 fg_off = 0;
633 } else {
634 ether_type = 0;
635 fg_off = fwnet_get_hdr_fg_off(&hdr);
636 }
637 datagram_label = fwnet_get_hdr_dgl(&hdr);
638 dg_size = fwnet_get_hdr_dg_size(&hdr);
639
640 if (fg_off + len > dg_size)
641 return 0;
642
643 spin_lock_irqsave(&dev->lock, flags);
644
645 peer = fwnet_peer_find_by_node_id(dev, source_node_id, generation);
646 if (!peer) {
647 retval = -ENOENT;
648 goto fail;
649 }
650
651 pd = fwnet_pd_find(peer, datagram_label);
652 if (pd == NULL) {
653 while (peer->pdg_size >= FWNET_MAX_FRAGMENTS) {
654 /* remove the oldest */
655 fwnet_pd_delete(list_first_entry(&peer->pd_list,
656 struct fwnet_partial_datagram, pd_link));
657 peer->pdg_size--;
658 }
659 pd = fwnet_pd_new(net, peer, datagram_label,
660 dg_size, buf, fg_off, len);
661 if (pd == NULL) {
662 retval = -ENOMEM;
663 goto fail;
664 }
665 peer->pdg_size++;
666 } else {
667 if (fwnet_frag_overlap(pd, fg_off, len) ||
668 pd->datagram_size != dg_size) {
669 /*
670 * Differing datagram sizes or overlapping fragments,
671 * discard old datagram and start a new one.
672 */
673 fwnet_pd_delete(pd);
674 pd = fwnet_pd_new(net, peer, datagram_label,
675 dg_size, buf, fg_off, len);
676 if (pd == NULL) {
677 peer->pdg_size--;
678 retval = -ENOMEM;
679 goto fail;
680 }
681 } else {
682 if (!fwnet_pd_update(peer, pd, buf, fg_off, len)) {
683 /*
684 * Couldn't save off fragment anyway
685 * so might as well obliterate the
686 * datagram now.
687 */
688 fwnet_pd_delete(pd);
689 peer->pdg_size--;
690 retval = -ENOMEM;
691 goto fail;
692 }
693 }
694 } /* new datagram or add to existing one */
695
696 if (lf == RFC2374_HDR_FIRSTFRAG)
697 pd->ether_type = ether_type;
698
699 if (fwnet_pd_is_complete(pd)) {
700 ether_type = pd->ether_type;
701 peer->pdg_size--;
702 skb = skb_get(pd->skb);
703 fwnet_pd_delete(pd);
704
705 spin_unlock_irqrestore(&dev->lock, flags);
706
707 return fwnet_finish_incoming_packet(net, skb, source_node_id,
708 false, ether_type);
709 }
710 /*
711 * Datagram is not complete, we're done for the
712 * moment.
713 */
714 retval = 0;
715 fail:
716 spin_unlock_irqrestore(&dev->lock, flags);
717
718 return retval;
719 }
720
721 static void fwnet_receive_packet(struct fw_card *card, struct fw_request *r,
722 int tcode, int destination, int source, int generation,
723 unsigned long long offset, void *payload, size_t length,
724 void *callback_data)
725 {
726 struct fwnet_device *dev = callback_data;
727 int rcode;
728
729 if (destination == IEEE1394_ALL_NODES) {
730 kfree(r);
731
732 return;
733 }
734
735 if (offset != dev->handler.offset)
736 rcode = RCODE_ADDRESS_ERROR;
737 else if (tcode != TCODE_WRITE_BLOCK_REQUEST)
738 rcode = RCODE_TYPE_ERROR;
739 else if (fwnet_incoming_packet(dev, payload, length,
740 source, generation, false) != 0) {
741 dev_err(&dev->netdev->dev, "incoming packet failure\n");
742 rcode = RCODE_CONFLICT_ERROR;
743 } else
744 rcode = RCODE_COMPLETE;
745
746 fw_send_response(card, r, rcode);
747 }
748
749 static int gasp_source_id(__be32 *p)
750 {
751 return be32_to_cpu(p[0]) >> 16;
752 }
753
754 static u32 gasp_specifier_id(__be32 *p)
755 {
756 return (be32_to_cpu(p[0]) & 0xffff) << 8 |
757 (be32_to_cpu(p[1]) & 0xff000000) >> 24;
758 }
759
760 static u32 gasp_version(__be32 *p)
761 {
762 return be32_to_cpu(p[1]) & 0xffffff;
763 }
764
765 static void fwnet_receive_broadcast(struct fw_iso_context *context,
766 u32 cycle, size_t header_length, void *header, void *data)
767 {
768 struct fwnet_device *dev;
769 struct fw_iso_packet packet;
770 __be16 *hdr_ptr;
771 __be32 *buf_ptr;
772 int retval;
773 u32 length;
774 unsigned long offset;
775 unsigned long flags;
776
777 dev = data;
778 hdr_ptr = header;
779 length = be16_to_cpup(hdr_ptr);
780
781 spin_lock_irqsave(&dev->lock, flags);
782
783 offset = dev->rcv_buffer_size * dev->broadcast_rcv_next_ptr;
784 buf_ptr = dev->broadcast_rcv_buffer_ptrs[dev->broadcast_rcv_next_ptr++];
785 if (dev->broadcast_rcv_next_ptr == dev->num_broadcast_rcv_ptrs)
786 dev->broadcast_rcv_next_ptr = 0;
787
788 spin_unlock_irqrestore(&dev->lock, flags);
789
790 if (length > IEEE1394_GASP_HDR_SIZE &&
791 gasp_specifier_id(buf_ptr) == IANA_SPECIFIER_ID &&
792 (gasp_version(buf_ptr) == RFC2734_SW_VERSION
793 #if IS_ENABLED(CONFIG_IPV6)
794 || gasp_version(buf_ptr) == RFC3146_SW_VERSION
795 #endif
796 ))
797 fwnet_incoming_packet(dev, buf_ptr + 2,
798 length - IEEE1394_GASP_HDR_SIZE,
799 gasp_source_id(buf_ptr),
800 context->card->generation, true);
801
802 packet.payload_length = dev->rcv_buffer_size;
803 packet.interrupt = 1;
804 packet.skip = 0;
805 packet.tag = 3;
806 packet.sy = 0;
807 packet.header_length = IEEE1394_GASP_HDR_SIZE;
808
809 spin_lock_irqsave(&dev->lock, flags);
810
811 retval = fw_iso_context_queue(dev->broadcast_rcv_context, &packet,
812 &dev->broadcast_rcv_buffer, offset);
813
814 spin_unlock_irqrestore(&dev->lock, flags);
815
816 if (retval >= 0)
817 fw_iso_context_queue_flush(dev->broadcast_rcv_context);
818 else
819 dev_err(&dev->netdev->dev, "requeue failed\n");
820 }
821
822 static struct kmem_cache *fwnet_packet_task_cache;
823
824 static void fwnet_free_ptask(struct fwnet_packet_task *ptask)
825 {
826 dev_kfree_skb_any(ptask->skb);
827 kmem_cache_free(fwnet_packet_task_cache, ptask);
828 }
829
830 /* Caller must hold dev->lock. */
831 static void dec_queued_datagrams(struct fwnet_device *dev)
832 {
833 if (--dev->queued_datagrams == FWNET_MIN_QUEUED_DATAGRAMS)
834 netif_wake_queue(dev->netdev);
835 }
836
837 static int fwnet_send_packet(struct fwnet_packet_task *ptask);
838
839 static void fwnet_transmit_packet_done(struct fwnet_packet_task *ptask)
840 {
841 struct fwnet_device *dev = ptask->dev;
842 struct sk_buff *skb = ptask->skb;
843 unsigned long flags;
844 bool free;
845
846 spin_lock_irqsave(&dev->lock, flags);
847
848 ptask->outstanding_pkts--;
849
850 /* Check whether we or the networking TX soft-IRQ is last user. */
851 free = (ptask->outstanding_pkts == 0 && ptask->enqueued);
852 if (free)
853 dec_queued_datagrams(dev);
854
855 if (ptask->outstanding_pkts == 0) {
856 dev->netdev->stats.tx_packets++;
857 dev->netdev->stats.tx_bytes += skb->len;
858 }
859
860 spin_unlock_irqrestore(&dev->lock, flags);
861
862 if (ptask->outstanding_pkts > 0) {
863 u16 dg_size;
864 u16 fg_off;
865 u16 datagram_label;
866 u16 lf;
867
868 /* Update the ptask to point to the next fragment and send it */
869 lf = fwnet_get_hdr_lf(&ptask->hdr);
870 switch (lf) {
871 case RFC2374_HDR_LASTFRAG:
872 case RFC2374_HDR_UNFRAG:
873 default:
874 dev_err(&dev->netdev->dev,
875 "outstanding packet %x lf %x, header %x,%x\n",
876 ptask->outstanding_pkts, lf, ptask->hdr.w0,
877 ptask->hdr.w1);
878 BUG();
879
880 case RFC2374_HDR_FIRSTFRAG:
881 /* Set frag type here for future interior fragments */
882 dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
883 fg_off = ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
884 datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
885 break;
886
887 case RFC2374_HDR_INTFRAG:
888 dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
889 fg_off = fwnet_get_hdr_fg_off(&ptask->hdr)
890 + ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
891 datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
892 break;
893 }
894
895 if (ptask->dest_node == IEEE1394_ALL_NODES) {
896 skb_pull(skb,
897 ptask->max_payload + IEEE1394_GASP_HDR_SIZE);
898 } else {
899 skb_pull(skb, ptask->max_payload);
900 }
901 if (ptask->outstanding_pkts > 1) {
902 fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_INTFRAG,
903 dg_size, fg_off, datagram_label);
904 } else {
905 fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_LASTFRAG,
906 dg_size, fg_off, datagram_label);
907 ptask->max_payload = skb->len + RFC2374_FRAG_HDR_SIZE;
908 }
909 fwnet_send_packet(ptask);
910 }
911
912 if (free)
913 fwnet_free_ptask(ptask);
914 }
915
916 static void fwnet_transmit_packet_failed(struct fwnet_packet_task *ptask)
917 {
918 struct fwnet_device *dev = ptask->dev;
919 unsigned long flags;
920 bool free;
921
922 spin_lock_irqsave(&dev->lock, flags);
923
924 /* One fragment failed; don't try to send remaining fragments. */
925 ptask->outstanding_pkts = 0;
926
927 /* Check whether we or the networking TX soft-IRQ is last user. */
928 free = ptask->enqueued;
929 if (free)
930 dec_queued_datagrams(dev);
931
932 dev->netdev->stats.tx_dropped++;
933 dev->netdev->stats.tx_errors++;
934
935 spin_unlock_irqrestore(&dev->lock, flags);
936
937 if (free)
938 fwnet_free_ptask(ptask);
939 }
940
941 static void fwnet_write_complete(struct fw_card *card, int rcode,
942 void *payload, size_t length, void *data)
943 {
944 struct fwnet_packet_task *ptask = data;
945 static unsigned long j;
946 static int last_rcode, errors_skipped;
947
948 if (rcode == RCODE_COMPLETE) {
949 fwnet_transmit_packet_done(ptask);
950 } else {
951 if (printk_timed_ratelimit(&j, 1000) || rcode != last_rcode) {
952 dev_err(&ptask->dev->netdev->dev,
953 "fwnet_write_complete failed: %x (skipped %d)\n",
954 rcode, errors_skipped);
955
956 errors_skipped = 0;
957 last_rcode = rcode;
958 } else {
959 errors_skipped++;
960 }
961 fwnet_transmit_packet_failed(ptask);
962 }
963 }
964
965 static int fwnet_send_packet(struct fwnet_packet_task *ptask)
966 {
967 struct fwnet_device *dev;
968 unsigned tx_len;
969 struct rfc2734_header *bufhdr;
970 unsigned long flags;
971 bool free;
972
973 dev = ptask->dev;
974 tx_len = ptask->max_payload;
975 switch (fwnet_get_hdr_lf(&ptask->hdr)) {
976 case RFC2374_HDR_UNFRAG:
977 bufhdr = (struct rfc2734_header *)
978 skb_push(ptask->skb, RFC2374_UNFRAG_HDR_SIZE);
979 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
980 break;
981
982 case RFC2374_HDR_FIRSTFRAG:
983 case RFC2374_HDR_INTFRAG:
984 case RFC2374_HDR_LASTFRAG:
985 bufhdr = (struct rfc2734_header *)
986 skb_push(ptask->skb, RFC2374_FRAG_HDR_SIZE);
987 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
988 put_unaligned_be32(ptask->hdr.w1, &bufhdr->w1);
989 break;
990
991 default:
992 BUG();
993 }
994 if (ptask->dest_node == IEEE1394_ALL_NODES) {
995 u8 *p;
996 int generation;
997 int node_id;
998 unsigned int sw_version;
999
1000 /* ptask->generation may not have been set yet */
1001 generation = dev->card->generation;
1002 smp_rmb();
1003 node_id = dev->card->node_id;
1004
1005 switch (ptask->skb->protocol) {
1006 default:
1007 sw_version = RFC2734_SW_VERSION;
1008 break;
1009 #if IS_ENABLED(CONFIG_IPV6)
1010 case htons(ETH_P_IPV6):
1011 sw_version = RFC3146_SW_VERSION;
1012 #endif
1013 }
1014
1015 p = skb_push(ptask->skb, IEEE1394_GASP_HDR_SIZE);
1016 put_unaligned_be32(node_id << 16 | IANA_SPECIFIER_ID >> 8, p);
1017 put_unaligned_be32((IANA_SPECIFIER_ID & 0xff) << 24
1018 | sw_version, &p[4]);
1019
1020 /* We should not transmit if broadcast_channel.valid == 0. */
1021 fw_send_request(dev->card, &ptask->transaction,
1022 TCODE_STREAM_DATA,
1023 fw_stream_packet_destination_id(3,
1024 IEEE1394_BROADCAST_CHANNEL, 0),
1025 generation, SCODE_100, 0ULL, ptask->skb->data,
1026 tx_len + 8, 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 goto out;
1040 }
1041
1042 fw_send_request(dev->card, &ptask->transaction,
1043 TCODE_WRITE_BLOCK_REQUEST, ptask->dest_node,
1044 ptask->generation, ptask->speed, ptask->fifo_addr,
1045 ptask->skb->data, tx_len, fwnet_write_complete, ptask);
1046
1047 spin_lock_irqsave(&dev->lock, flags);
1048
1049 /* If the AT tasklet already ran, we may be last user. */
1050 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1051 if (!free)
1052 ptask->enqueued = true;
1053 else
1054 dec_queued_datagrams(dev);
1055
1056 spin_unlock_irqrestore(&dev->lock, flags);
1057
1058 dev->netdev->trans_start = jiffies;
1059 out:
1060 if (free)
1061 fwnet_free_ptask(ptask);
1062
1063 return 0;
1064 }
1065
1066 static void fwnet_fifo_stop(struct fwnet_device *dev)
1067 {
1068 if (dev->local_fifo == FWNET_NO_FIFO_ADDR)
1069 return;
1070
1071 fw_core_remove_address_handler(&dev->handler);
1072 dev->local_fifo = FWNET_NO_FIFO_ADDR;
1073 }
1074
1075 static int fwnet_fifo_start(struct fwnet_device *dev)
1076 {
1077 int retval;
1078
1079 if (dev->local_fifo != FWNET_NO_FIFO_ADDR)
1080 return 0;
1081
1082 dev->handler.length = 4096;
1083 dev->handler.address_callback = fwnet_receive_packet;
1084 dev->handler.callback_data = dev;
1085
1086 retval = fw_core_add_address_handler(&dev->handler,
1087 &fw_high_memory_region);
1088 if (retval < 0)
1089 return retval;
1090
1091 dev->local_fifo = dev->handler.offset;
1092
1093 return 0;
1094 }
1095
1096 static void __fwnet_broadcast_stop(struct fwnet_device *dev)
1097 {
1098 unsigned u;
1099
1100 if (dev->broadcast_state != FWNET_BROADCAST_ERROR) {
1101 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++)
1102 kunmap(dev->broadcast_rcv_buffer.pages[u]);
1103 fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer, dev->card);
1104 }
1105 if (dev->broadcast_rcv_context) {
1106 fw_iso_context_destroy(dev->broadcast_rcv_context);
1107 dev->broadcast_rcv_context = NULL;
1108 }
1109 kfree(dev->broadcast_rcv_buffer_ptrs);
1110 dev->broadcast_rcv_buffer_ptrs = NULL;
1111 dev->broadcast_state = FWNET_BROADCAST_ERROR;
1112 }
1113
1114 static void fwnet_broadcast_stop(struct fwnet_device *dev)
1115 {
1116 if (dev->broadcast_state == FWNET_BROADCAST_ERROR)
1117 return;
1118 fw_iso_context_stop(dev->broadcast_rcv_context);
1119 __fwnet_broadcast_stop(dev);
1120 }
1121
1122 static int fwnet_broadcast_start(struct fwnet_device *dev)
1123 {
1124 struct fw_iso_context *context;
1125 int retval;
1126 unsigned num_packets;
1127 unsigned max_receive;
1128 struct fw_iso_packet packet;
1129 unsigned long offset;
1130 void **ptrptr;
1131 unsigned u;
1132
1133 if (dev->broadcast_state != FWNET_BROADCAST_ERROR)
1134 return 0;
1135
1136 max_receive = 1U << (dev->card->max_receive + 1);
1137 num_packets = (FWNET_ISO_PAGE_COUNT * PAGE_SIZE) / max_receive;
1138
1139 ptrptr = kmalloc(sizeof(void *) * num_packets, GFP_KERNEL);
1140 if (!ptrptr) {
1141 retval = -ENOMEM;
1142 goto failed;
1143 }
1144 dev->broadcast_rcv_buffer_ptrs = ptrptr;
1145
1146 context = fw_iso_context_create(dev->card, FW_ISO_CONTEXT_RECEIVE,
1147 IEEE1394_BROADCAST_CHANNEL,
1148 dev->card->link_speed, 8,
1149 fwnet_receive_broadcast, dev);
1150 if (IS_ERR(context)) {
1151 retval = PTR_ERR(context);
1152 goto failed;
1153 }
1154
1155 retval = fw_iso_buffer_init(&dev->broadcast_rcv_buffer, dev->card,
1156 FWNET_ISO_PAGE_COUNT, DMA_FROM_DEVICE);
1157 if (retval < 0)
1158 goto failed;
1159
1160 dev->broadcast_state = FWNET_BROADCAST_STOPPED;
1161
1162 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++) {
1163 void *ptr;
1164 unsigned v;
1165
1166 ptr = kmap(dev->broadcast_rcv_buffer.pages[u]);
1167 for (v = 0; v < num_packets / FWNET_ISO_PAGE_COUNT; v++)
1168 *ptrptr++ = (void *) ((char *)ptr + v * max_receive);
1169 }
1170 dev->broadcast_rcv_context = context;
1171
1172 packet.payload_length = max_receive;
1173 packet.interrupt = 1;
1174 packet.skip = 0;
1175 packet.tag = 3;
1176 packet.sy = 0;
1177 packet.header_length = IEEE1394_GASP_HDR_SIZE;
1178 offset = 0;
1179
1180 for (u = 0; u < num_packets; u++) {
1181 retval = fw_iso_context_queue(context, &packet,
1182 &dev->broadcast_rcv_buffer, offset);
1183 if (retval < 0)
1184 goto failed;
1185
1186 offset += max_receive;
1187 }
1188 dev->num_broadcast_rcv_ptrs = num_packets;
1189 dev->rcv_buffer_size = max_receive;
1190 dev->broadcast_rcv_next_ptr = 0U;
1191 retval = fw_iso_context_start(context, -1, 0,
1192 FW_ISO_CONTEXT_MATCH_ALL_TAGS); /* ??? sync */
1193 if (retval < 0)
1194 goto failed;
1195
1196 /* FIXME: adjust it according to the min. speed of all known peers? */
1197 dev->broadcast_xmt_max_payload = IEEE1394_MAX_PAYLOAD_S100
1198 - IEEE1394_GASP_HDR_SIZE - RFC2374_UNFRAG_HDR_SIZE;
1199 dev->broadcast_state = FWNET_BROADCAST_RUNNING;
1200
1201 return 0;
1202
1203 failed:
1204 __fwnet_broadcast_stop(dev);
1205 return retval;
1206 }
1207
1208 static void set_carrier_state(struct fwnet_device *dev)
1209 {
1210 if (dev->peer_count > 1)
1211 netif_carrier_on(dev->netdev);
1212 else
1213 netif_carrier_off(dev->netdev);
1214 }
1215
1216 /* ifup */
1217 static int fwnet_open(struct net_device *net)
1218 {
1219 struct fwnet_device *dev = netdev_priv(net);
1220 int ret;
1221
1222 ret = fwnet_broadcast_start(dev);
1223 if (ret)
1224 return ret;
1225
1226 netif_start_queue(net);
1227
1228 spin_lock_irq(&dev->lock);
1229 set_carrier_state(dev);
1230 spin_unlock_irq(&dev->lock);
1231
1232 return 0;
1233 }
1234
1235 /* ifdown */
1236 static int fwnet_stop(struct net_device *net)
1237 {
1238 struct fwnet_device *dev = netdev_priv(net);
1239
1240 netif_stop_queue(net);
1241 fwnet_broadcast_stop(dev);
1242
1243 return 0;
1244 }
1245
1246 static netdev_tx_t fwnet_tx(struct sk_buff *skb, struct net_device *net)
1247 {
1248 struct fwnet_header hdr_buf;
1249 struct fwnet_device *dev = netdev_priv(net);
1250 __be16 proto;
1251 u16 dest_node;
1252 unsigned max_payload;
1253 u16 dg_size;
1254 u16 *datagram_label_ptr;
1255 struct fwnet_packet_task *ptask;
1256 struct fwnet_peer *peer;
1257 unsigned long flags;
1258
1259 spin_lock_irqsave(&dev->lock, flags);
1260
1261 /* Can this happen? */
1262 if (netif_queue_stopped(dev->netdev)) {
1263 spin_unlock_irqrestore(&dev->lock, flags);
1264
1265 return NETDEV_TX_BUSY;
1266 }
1267
1268 ptask = kmem_cache_alloc(fwnet_packet_task_cache, GFP_ATOMIC);
1269 if (ptask == NULL)
1270 goto fail;
1271
1272 skb = skb_share_check(skb, GFP_ATOMIC);
1273 if (!skb)
1274 goto fail;
1275
1276 /*
1277 * Make a copy of the driver-specific header.
1278 * We might need to rebuild the header on tx failure.
1279 */
1280 memcpy(&hdr_buf, skb->data, sizeof(hdr_buf));
1281 proto = hdr_buf.h_proto;
1282
1283 switch (proto) {
1284 case htons(ETH_P_ARP):
1285 case htons(ETH_P_IP):
1286 #if IS_ENABLED(CONFIG_IPV6)
1287 case htons(ETH_P_IPV6):
1288 #endif
1289 break;
1290 default:
1291 goto fail;
1292 }
1293
1294 skb_pull(skb, sizeof(hdr_buf));
1295 dg_size = skb->len;
1296
1297 /*
1298 * Set the transmission type for the packet. ARP packets and IP
1299 * broadcast packets are sent via GASP.
1300 */
1301 if (fwnet_hwaddr_is_multicast(hdr_buf.h_dest)) {
1302 max_payload = dev->broadcast_xmt_max_payload;
1303 datagram_label_ptr = &dev->broadcast_xmt_datagramlabel;
1304
1305 ptask->fifo_addr = FWNET_NO_FIFO_ADDR;
1306 ptask->generation = 0;
1307 ptask->dest_node = IEEE1394_ALL_NODES;
1308 ptask->speed = SCODE_100;
1309 } else {
1310 union fwnet_hwaddr *ha = (union fwnet_hwaddr *)hdr_buf.h_dest;
1311 __be64 guid = get_unaligned(&ha->uc.uniq_id);
1312 u8 generation;
1313
1314 peer = fwnet_peer_find_by_guid(dev, be64_to_cpu(guid));
1315 if (!peer)
1316 goto fail;
1317
1318 generation = peer->generation;
1319 dest_node = peer->node_id;
1320 max_payload = peer->max_payload;
1321 datagram_label_ptr = &peer->datagram_label;
1322
1323 ptask->fifo_addr = fwnet_hwaddr_fifo(ha);
1324 ptask->generation = generation;
1325 ptask->dest_node = dest_node;
1326 ptask->speed = peer->speed;
1327 }
1328
1329 ptask->hdr.w0 = 0;
1330 ptask->hdr.w1 = 0;
1331 ptask->skb = skb;
1332 ptask->dev = dev;
1333
1334 /* Does it all fit in one packet? */
1335 if (dg_size <= max_payload) {
1336 fwnet_make_uf_hdr(&ptask->hdr, ntohs(proto));
1337 ptask->outstanding_pkts = 1;
1338 max_payload = dg_size + RFC2374_UNFRAG_HDR_SIZE;
1339 } else {
1340 u16 datagram_label;
1341
1342 max_payload -= RFC2374_FRAG_OVERHEAD;
1343 datagram_label = (*datagram_label_ptr)++;
1344 fwnet_make_ff_hdr(&ptask->hdr, ntohs(proto), dg_size,
1345 datagram_label);
1346 ptask->outstanding_pkts = DIV_ROUND_UP(dg_size, max_payload);
1347 max_payload += RFC2374_FRAG_HDR_SIZE;
1348 }
1349
1350 if (++dev->queued_datagrams == FWNET_MAX_QUEUED_DATAGRAMS)
1351 netif_stop_queue(dev->netdev);
1352
1353 spin_unlock_irqrestore(&dev->lock, flags);
1354
1355 ptask->max_payload = max_payload;
1356 ptask->enqueued = 0;
1357
1358 fwnet_send_packet(ptask);
1359
1360 return NETDEV_TX_OK;
1361
1362 fail:
1363 spin_unlock_irqrestore(&dev->lock, flags);
1364
1365 if (ptask)
1366 kmem_cache_free(fwnet_packet_task_cache, ptask);
1367
1368 if (skb != NULL)
1369 dev_kfree_skb(skb);
1370
1371 net->stats.tx_dropped++;
1372 net->stats.tx_errors++;
1373
1374 /*
1375 * FIXME: According to a patch from 2003-02-26, "returning non-zero
1376 * causes serious problems" here, allegedly. Before that patch,
1377 * -ERRNO was returned which is not appropriate under Linux 2.6.
1378 * Perhaps more needs to be done? Stop the queue in serious
1379 * conditions and restart it elsewhere?
1380 */
1381 return NETDEV_TX_OK;
1382 }
1383
1384 static int fwnet_change_mtu(struct net_device *net, int new_mtu)
1385 {
1386 if (new_mtu < 68)
1387 return -EINVAL;
1388
1389 net->mtu = new_mtu;
1390 return 0;
1391 }
1392
1393 static const struct ethtool_ops fwnet_ethtool_ops = {
1394 .get_link = ethtool_op_get_link,
1395 };
1396
1397 static const struct net_device_ops fwnet_netdev_ops = {
1398 .ndo_open = fwnet_open,
1399 .ndo_stop = fwnet_stop,
1400 .ndo_start_xmit = fwnet_tx,
1401 .ndo_change_mtu = fwnet_change_mtu,
1402 };
1403
1404 static void fwnet_init_dev(struct net_device *net)
1405 {
1406 net->header_ops = &fwnet_header_ops;
1407 net->netdev_ops = &fwnet_netdev_ops;
1408 net->watchdog_timeo = 2 * HZ;
1409 net->flags = IFF_BROADCAST | IFF_MULTICAST;
1410 net->features = NETIF_F_HIGHDMA;
1411 net->addr_len = FWNET_ALEN;
1412 net->hard_header_len = FWNET_HLEN;
1413 net->type = ARPHRD_IEEE1394;
1414 net->tx_queue_len = FWNET_TX_QUEUE_LEN;
1415 net->ethtool_ops = &fwnet_ethtool_ops;
1416 }
1417
1418 /* caller must hold fwnet_device_mutex */
1419 static struct fwnet_device *fwnet_dev_find(struct fw_card *card)
1420 {
1421 struct fwnet_device *dev;
1422
1423 list_for_each_entry(dev, &fwnet_device_list, dev_link)
1424 if (dev->card == card)
1425 return dev;
1426
1427 return NULL;
1428 }
1429
1430 static int fwnet_add_peer(struct fwnet_device *dev,
1431 struct fw_unit *unit, struct fw_device *device)
1432 {
1433 struct fwnet_peer *peer;
1434
1435 peer = kmalloc(sizeof(*peer), GFP_KERNEL);
1436 if (!peer)
1437 return -ENOMEM;
1438
1439 dev_set_drvdata(&unit->device, peer);
1440
1441 peer->dev = dev;
1442 peer->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4];
1443 INIT_LIST_HEAD(&peer->pd_list);
1444 peer->pdg_size = 0;
1445 peer->datagram_label = 0;
1446 peer->speed = device->max_speed;
1447 peer->max_payload = fwnet_max_payload(device->max_rec, peer->speed);
1448
1449 peer->generation = device->generation;
1450 smp_rmb();
1451 peer->node_id = device->node_id;
1452
1453 spin_lock_irq(&dev->lock);
1454 list_add_tail(&peer->peer_link, &dev->peer_list);
1455 dev->peer_count++;
1456 set_carrier_state(dev);
1457 spin_unlock_irq(&dev->lock);
1458
1459 return 0;
1460 }
1461
1462 static int fwnet_probe(struct fw_unit *unit,
1463 const struct ieee1394_device_id *id)
1464 {
1465 struct fw_device *device = fw_parent_device(unit);
1466 struct fw_card *card = device->card;
1467 struct net_device *net;
1468 bool allocated_netdev = false;
1469 struct fwnet_device *dev;
1470 unsigned max_mtu;
1471 int ret;
1472 union fwnet_hwaddr *ha;
1473
1474 mutex_lock(&fwnet_device_mutex);
1475
1476 dev = fwnet_dev_find(card);
1477 if (dev) {
1478 net = dev->netdev;
1479 goto have_dev;
1480 }
1481
1482 net = alloc_netdev(sizeof(*dev), "firewire%d", NET_NAME_UNKNOWN,
1483 fwnet_init_dev);
1484 if (net == NULL) {
1485 mutex_unlock(&fwnet_device_mutex);
1486 return -ENOMEM;
1487 }
1488
1489 allocated_netdev = true;
1490 SET_NETDEV_DEV(net, card->device);
1491 dev = netdev_priv(net);
1492
1493 spin_lock_init(&dev->lock);
1494 dev->broadcast_state = FWNET_BROADCAST_ERROR;
1495 dev->broadcast_rcv_context = NULL;
1496 dev->broadcast_xmt_max_payload = 0;
1497 dev->broadcast_xmt_datagramlabel = 0;
1498 dev->local_fifo = FWNET_NO_FIFO_ADDR;
1499 dev->queued_datagrams = 0;
1500 INIT_LIST_HEAD(&dev->peer_list);
1501 dev->card = card;
1502 dev->netdev = net;
1503
1504 ret = fwnet_fifo_start(dev);
1505 if (ret < 0)
1506 goto out;
1507 dev->local_fifo = dev->handler.offset;
1508
1509 /*
1510 * Use the RFC 2734 default 1500 octets or the maximum payload
1511 * as initial MTU
1512 */
1513 max_mtu = (1 << (card->max_receive + 1))
1514 - sizeof(struct rfc2734_header) - IEEE1394_GASP_HDR_SIZE;
1515 net->mtu = min(1500U, max_mtu);
1516
1517 /* Set our hardware address while we're at it */
1518 ha = (union fwnet_hwaddr *)net->dev_addr;
1519 put_unaligned_be64(card->guid, &ha->uc.uniq_id);
1520 ha->uc.max_rec = dev->card->max_receive;
1521 ha->uc.sspd = dev->card->link_speed;
1522 put_unaligned_be16(dev->local_fifo >> 32, &ha->uc.fifo_hi);
1523 put_unaligned_be32(dev->local_fifo & 0xffffffff, &ha->uc.fifo_lo);
1524
1525 memset(net->broadcast, -1, net->addr_len);
1526
1527 ret = register_netdev(net);
1528 if (ret)
1529 goto out;
1530
1531 list_add_tail(&dev->dev_link, &fwnet_device_list);
1532 dev_notice(&net->dev, "IP over IEEE 1394 on card %s\n",
1533 dev_name(card->device));
1534 have_dev:
1535 ret = fwnet_add_peer(dev, unit, device);
1536 if (ret && allocated_netdev) {
1537 unregister_netdev(net);
1538 list_del(&dev->dev_link);
1539 out:
1540 fwnet_fifo_stop(dev);
1541 free_netdev(net);
1542 }
1543
1544 mutex_unlock(&fwnet_device_mutex);
1545
1546 return ret;
1547 }
1548
1549 /*
1550 * FIXME abort partially sent fragmented datagrams,
1551 * discard partially received fragmented datagrams
1552 */
1553 static void fwnet_update(struct fw_unit *unit)
1554 {
1555 struct fw_device *device = fw_parent_device(unit);
1556 struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1557 int generation;
1558
1559 generation = device->generation;
1560
1561 spin_lock_irq(&peer->dev->lock);
1562 peer->node_id = device->node_id;
1563 peer->generation = generation;
1564 spin_unlock_irq(&peer->dev->lock);
1565 }
1566
1567 static void fwnet_remove_peer(struct fwnet_peer *peer, struct fwnet_device *dev)
1568 {
1569 struct fwnet_partial_datagram *pd, *pd_next;
1570
1571 spin_lock_irq(&dev->lock);
1572 list_del(&peer->peer_link);
1573 dev->peer_count--;
1574 set_carrier_state(dev);
1575 spin_unlock_irq(&dev->lock);
1576
1577 list_for_each_entry_safe(pd, pd_next, &peer->pd_list, pd_link)
1578 fwnet_pd_delete(pd);
1579
1580 kfree(peer);
1581 }
1582
1583 static void fwnet_remove(struct fw_unit *unit)
1584 {
1585 struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1586 struct fwnet_device *dev = peer->dev;
1587 struct net_device *net;
1588 int i;
1589
1590 mutex_lock(&fwnet_device_mutex);
1591
1592 net = dev->netdev;
1593
1594 fwnet_remove_peer(peer, dev);
1595
1596 if (list_empty(&dev->peer_list)) {
1597 unregister_netdev(net);
1598
1599 fwnet_fifo_stop(dev);
1600
1601 for (i = 0; dev->queued_datagrams && i < 5; i++)
1602 ssleep(1);
1603 WARN_ON(dev->queued_datagrams);
1604 list_del(&dev->dev_link);
1605
1606 free_netdev(net);
1607 }
1608
1609 mutex_unlock(&fwnet_device_mutex);
1610 }
1611
1612 static const struct ieee1394_device_id fwnet_id_table[] = {
1613 {
1614 .match_flags = IEEE1394_MATCH_SPECIFIER_ID |
1615 IEEE1394_MATCH_VERSION,
1616 .specifier_id = IANA_SPECIFIER_ID,
1617 .version = RFC2734_SW_VERSION,
1618 },
1619 #if IS_ENABLED(CONFIG_IPV6)
1620 {
1621 .match_flags = IEEE1394_MATCH_SPECIFIER_ID |
1622 IEEE1394_MATCH_VERSION,
1623 .specifier_id = IANA_SPECIFIER_ID,
1624 .version = RFC3146_SW_VERSION,
1625 },
1626 #endif
1627 { }
1628 };
1629
1630 static struct fw_driver fwnet_driver = {
1631 .driver = {
1632 .owner = THIS_MODULE,
1633 .name = KBUILD_MODNAME,
1634 .bus = &fw_bus_type,
1635 },
1636 .probe = fwnet_probe,
1637 .update = fwnet_update,
1638 .remove = fwnet_remove,
1639 .id_table = fwnet_id_table,
1640 };
1641
1642 static const u32 rfc2374_unit_directory_data[] = {
1643 0x00040000, /* directory_length */
1644 0x1200005e, /* unit_specifier_id: IANA */
1645 0x81000003, /* textual descriptor offset */
1646 0x13000001, /* unit_sw_version: RFC 2734 */
1647 0x81000005, /* textual descriptor offset */
1648 0x00030000, /* descriptor_length */
1649 0x00000000, /* text */
1650 0x00000000, /* minimal ASCII, en */
1651 0x49414e41, /* I A N A */
1652 0x00030000, /* descriptor_length */
1653 0x00000000, /* text */
1654 0x00000000, /* minimal ASCII, en */
1655 0x49507634, /* I P v 4 */
1656 };
1657
1658 static struct fw_descriptor rfc2374_unit_directory = {
1659 .length = ARRAY_SIZE(rfc2374_unit_directory_data),
1660 .key = (CSR_DIRECTORY | CSR_UNIT) << 24,
1661 .data = rfc2374_unit_directory_data
1662 };
1663
1664 #if IS_ENABLED(CONFIG_IPV6)
1665 static const u32 rfc3146_unit_directory_data[] = {
1666 0x00040000, /* directory_length */
1667 0x1200005e, /* unit_specifier_id: IANA */
1668 0x81000003, /* textual descriptor offset */
1669 0x13000002, /* unit_sw_version: RFC 3146 */
1670 0x81000005, /* textual descriptor offset */
1671 0x00030000, /* descriptor_length */
1672 0x00000000, /* text */
1673 0x00000000, /* minimal ASCII, en */
1674 0x49414e41, /* I A N A */
1675 0x00030000, /* descriptor_length */
1676 0x00000000, /* text */
1677 0x00000000, /* minimal ASCII, en */
1678 0x49507636, /* I P v 6 */
1679 };
1680
1681 static struct fw_descriptor rfc3146_unit_directory = {
1682 .length = ARRAY_SIZE(rfc3146_unit_directory_data),
1683 .key = (CSR_DIRECTORY | CSR_UNIT) << 24,
1684 .data = rfc3146_unit_directory_data
1685 };
1686 #endif
1687
1688 static int __init fwnet_init(void)
1689 {
1690 int err;
1691
1692 err = fw_core_add_descriptor(&rfc2374_unit_directory);
1693 if (err)
1694 return err;
1695
1696 #if IS_ENABLED(CONFIG_IPV6)
1697 err = fw_core_add_descriptor(&rfc3146_unit_directory);
1698 if (err)
1699 goto out;
1700 #endif
1701
1702 fwnet_packet_task_cache = kmem_cache_create("packet_task",
1703 sizeof(struct fwnet_packet_task), 0, 0, NULL);
1704 if (!fwnet_packet_task_cache) {
1705 err = -ENOMEM;
1706 goto out2;
1707 }
1708
1709 err = driver_register(&fwnet_driver.driver);
1710 if (!err)
1711 return 0;
1712
1713 kmem_cache_destroy(fwnet_packet_task_cache);
1714 out2:
1715 #if IS_ENABLED(CONFIG_IPV6)
1716 fw_core_remove_descriptor(&rfc3146_unit_directory);
1717 out:
1718 #endif
1719 fw_core_remove_descriptor(&rfc2374_unit_directory);
1720
1721 return err;
1722 }
1723 module_init(fwnet_init);
1724
1725 static void __exit fwnet_cleanup(void)
1726 {
1727 driver_unregister(&fwnet_driver.driver);
1728 kmem_cache_destroy(fwnet_packet_task_cache);
1729 #if IS_ENABLED(CONFIG_IPV6)
1730 fw_core_remove_descriptor(&rfc3146_unit_directory);
1731 #endif
1732 fw_core_remove_descriptor(&rfc2374_unit_directory);
1733 }
1734 module_exit(fwnet_cleanup);
1735
1736 MODULE_AUTHOR("Jay Fenlason <fenlason@redhat.com>");
1737 MODULE_DESCRIPTION("IP over IEEE1394 as per RFC 2734/3146");
1738 MODULE_LICENSE("GPL");
1739 MODULE_DEVICE_TABLE(ieee1394, fwnet_id_table);
Linux with added FPC-III support