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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * IPv4 over IEEE 1394, per RFC 2734
4 * IPv6 over IEEE 1394, per RFC 3146
5 *
6 * Copyright (C) 2009 Jay Fenlason <[email protected]>
7 *
8 * based on eth1394 by Ben Collins et al
9 */
10
11#include <linux/bug.h>
12#include <linux/compiler.h>
13#include <linux/delay.h>
14#include <linux/device.h>
15#include <linux/ethtool.h>
16#include <linux/firewire.h>
17#include <linux/firewire-constants.h>
18#include <linux/highmem.h>
19#include <linux/in.h>
20#include <linux/ip.h>
21#include <linux/jiffies.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 <linux/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
63static bool fwnet_hwaddr_is_multicast(u8 *ha)
64{
65 return !!(*ha & 1);
66}
67
68/* IPv4 and IPv6 encapsulation header */
69struct 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
87static 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
94static 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
103static 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 */
113struct fwnet_fragment_info {
114 struct list_head fi_link;
115 u16 offset;
116 u16 len;
117};
118
119struct 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
130static DEFINE_MUTEX(fwnet_device_mutex);
131static LIST_HEAD(fwnet_device_list);
132
133struct 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
171struct 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. */
188struct 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 * saddr == NULL means use device source address.
205 * daddr == NULL means leave destination address (eg unresolved arp).
206 */
207static int fwnet_header_create(struct sk_buff *skb, struct net_device *net,
208 unsigned short type, const void *daddr,
209 const void *saddr, unsigned len)
210{
211 struct fwnet_header *h;
212
213 h = skb_push(skb, sizeof(*h));
214 put_unaligned_be16(type, &h->h_proto);
215
216 if (net->flags & (IFF_LOOPBACK | IFF_NOARP)) {
217 memset(h->h_dest, 0, net->addr_len);
218
219 return net->hard_header_len;
220 }
221
222 if (daddr) {
223 memcpy(h->h_dest, daddr, net->addr_len);
224
225 return net->hard_header_len;
226 }
227
228 return -net->hard_header_len;
229}
230
231static int fwnet_header_cache(const struct neighbour *neigh,
232 struct hh_cache *hh, __be16 type)
233{
234 struct net_device *net;
235 struct fwnet_header *h;
236
237 if (type == cpu_to_be16(ETH_P_802_3))
238 return -1;
239 net = neigh->dev;
240 h = (struct fwnet_header *)((u8 *)hh->hh_data + HH_DATA_OFF(sizeof(*h)));
241 h->h_proto = type;
242 memcpy(h->h_dest, neigh->ha, net->addr_len);
243
244 /* Pairs with the READ_ONCE() in neigh_resolve_output(),
245 * neigh_hh_output() and neigh_update_hhs().
246 */
247 smp_store_release(&hh->hh_len, FWNET_HLEN);
248
249 return 0;
250}
251
252/* Called by Address Resolution module to notify changes in address. */
253static void fwnet_header_cache_update(struct hh_cache *hh,
254 const struct net_device *net, const unsigned char *haddr)
255{
256 memcpy((u8 *)hh->hh_data + HH_DATA_OFF(FWNET_HLEN), haddr, net->addr_len);
257}
258
259static int fwnet_header_parse(const struct sk_buff *skb, const struct net_device *dev,
260 unsigned char *haddr)
261{
262 memcpy(haddr, dev->dev_addr, FWNET_ALEN);
263
264 return FWNET_ALEN;
265}
266
267static const struct header_ops fwnet_header_ops = {
268 .create = fwnet_header_create,
269 .cache = fwnet_header_cache,
270 .cache_update = fwnet_header_cache_update,
271 .parse = fwnet_header_parse,
272};
273
274/* FIXME: is this correct for all cases? */
275static bool fwnet_frag_overlap(struct fwnet_partial_datagram *pd,
276 unsigned offset, unsigned len)
277{
278 struct fwnet_fragment_info *fi;
279 unsigned end = offset + len;
280
281 list_for_each_entry(fi, &pd->fi_list, fi_link)
282 if (offset < fi->offset + fi->len && end > fi->offset)
283 return true;
284
285 return false;
286}
287
288/* Assumes that new fragment does not overlap any existing fragments */
289static struct fwnet_fragment_info *fwnet_frag_new(
290 struct fwnet_partial_datagram *pd, unsigned offset, unsigned len)
291{
292 struct fwnet_fragment_info *fi, *fi2, *new;
293 struct list_head *list;
294
295 list = &pd->fi_list;
296 list_for_each_entry(fi, &pd->fi_list, fi_link) {
297 if (fi->offset + fi->len == offset) {
298 /* The new fragment can be tacked on to the end */
299 /* Did the new fragment plug a hole? */
300 if (!list_is_last(&fi->fi_link, &pd->fi_list)) {
301 fi2 = list_next_entry(fi, fi_link);
302 if (offset + len == fi2->offset) {
303 /* glue fragments together */
304 fi->len += len + fi2->len;
305 list_del(&fi2->fi_link);
306 kfree(fi2);
307
308 return fi;
309 }
310 }
311 fi->len += len;
312
313 return fi;
314 }
315 if (offset + len == fi->offset) {
316 /* The new fragment can be tacked on to the beginning */
317 /* Did the new fragment plug a hole? */
318 if (!list_is_first(&fi->fi_link, &pd->fi_list)) {
319 fi2 = list_prev_entry(fi, fi_link);
320 if (fi2->offset + fi2->len == offset) {
321 /* glue fragments together */
322 fi2->len += fi->len + len;
323 list_del(&fi->fi_link);
324 kfree(fi);
325
326 return fi2;
327 }
328 }
329 fi->offset = offset;
330 fi->len += len;
331
332 return fi;
333 }
334 if (offset > fi->offset + fi->len) {
335 list = &fi->fi_link;
336 break;
337 }
338 if (offset + len < fi->offset) {
339 list = fi->fi_link.prev;
340 break;
341 }
342 }
343
344 new = kmalloc_obj(*new, GFP_ATOMIC);
345 if (!new)
346 return NULL;
347
348 new->offset = offset;
349 new->len = len;
350 list_add(&new->fi_link, list);
351
352 return new;
353}
354
355static struct fwnet_partial_datagram *fwnet_pd_new(struct net_device *net,
356 struct fwnet_peer *peer, u16 datagram_label, unsigned dg_size,
357 void *frag_buf, unsigned frag_off, unsigned frag_len)
358{
359 struct fwnet_partial_datagram *new;
360 struct fwnet_fragment_info *fi;
361
362 new = kmalloc_obj(*new, GFP_ATOMIC);
363 if (!new)
364 goto fail;
365
366 INIT_LIST_HEAD(&new->fi_list);
367 fi = fwnet_frag_new(new, frag_off, frag_len);
368 if (fi == NULL)
369 goto fail_w_new;
370
371 new->datagram_label = datagram_label;
372 new->datagram_size = dg_size;
373 new->skb = dev_alloc_skb(dg_size + LL_RESERVED_SPACE(net));
374 if (new->skb == NULL)
375 goto fail_w_fi;
376
377 skb_reserve(new->skb, LL_RESERVED_SPACE(net));
378 new->pbuf = skb_put(new->skb, dg_size);
379 memcpy(new->pbuf + frag_off, frag_buf, frag_len);
380 list_add_tail(&new->pd_link, &peer->pd_list);
381
382 return new;
383
384fail_w_fi:
385 kfree(fi);
386fail_w_new:
387 kfree(new);
388fail:
389 return NULL;
390}
391
392static struct fwnet_partial_datagram *fwnet_pd_find(struct fwnet_peer *peer,
393 u16 datagram_label)
394{
395 struct fwnet_partial_datagram *pd;
396
397 list_for_each_entry(pd, &peer->pd_list, pd_link)
398 if (pd->datagram_label == datagram_label)
399 return pd;
400
401 return NULL;
402}
403
404
405static void fwnet_pd_delete(struct fwnet_partial_datagram *old)
406{
407 struct fwnet_fragment_info *fi, *n;
408
409 list_for_each_entry_safe(fi, n, &old->fi_list, fi_link)
410 kfree(fi);
411
412 list_del(&old->pd_link);
413 dev_kfree_skb_any(old->skb);
414 kfree(old);
415}
416
417static bool fwnet_pd_update(struct fwnet_peer *peer,
418 struct fwnet_partial_datagram *pd, void *frag_buf,
419 unsigned frag_off, unsigned frag_len)
420{
421 if (fwnet_frag_new(pd, frag_off, frag_len) == NULL)
422 return false;
423
424 memcpy(pd->pbuf + frag_off, frag_buf, frag_len);
425
426 /*
427 * Move list entry to beginning of list so that oldest partial
428 * datagrams percolate to the end of the list
429 */
430 list_move_tail(&pd->pd_link, &peer->pd_list);
431
432 return true;
433}
434
435static bool fwnet_pd_is_complete(struct fwnet_partial_datagram *pd)
436{
437 struct fwnet_fragment_info *fi;
438
439 fi = list_entry(pd->fi_list.next, struct fwnet_fragment_info, fi_link);
440
441 return fi->len == pd->datagram_size;
442}
443
444/* caller must hold dev->lock */
445static struct fwnet_peer *fwnet_peer_find_by_guid(struct fwnet_device *dev,
446 u64 guid)
447{
448 struct fwnet_peer *peer;
449
450 list_for_each_entry(peer, &dev->peer_list, peer_link)
451 if (peer->guid == guid)
452 return peer;
453
454 return NULL;
455}
456
457/* caller must hold dev->lock */
458static struct fwnet_peer *fwnet_peer_find_by_node_id(struct fwnet_device *dev,
459 int node_id, int generation)
460{
461 struct fwnet_peer *peer;
462
463 list_for_each_entry(peer, &dev->peer_list, peer_link)
464 if (peer->node_id == node_id &&
465 peer->generation == generation)
466 return peer;
467
468 return NULL;
469}
470
471/* See IEEE 1394-2008 table 6-4, table 8-8, table 16-18. */
472static unsigned fwnet_max_payload(unsigned max_rec, unsigned speed)
473{
474 max_rec = min(max_rec, speed + 8);
475 max_rec = clamp(max_rec, 8U, 11U); /* 512...4096 */
476
477 return (1 << (max_rec + 1)) - RFC2374_FRAG_HDR_SIZE;
478}
479
480
481static int fwnet_finish_incoming_packet(struct net_device *net,
482 struct sk_buff *skb, u16 source_node_id,
483 bool is_broadcast, u16 ether_type)
484{
485 int status, len;
486
487 switch (ether_type) {
488 case ETH_P_ARP:
489 case ETH_P_IP:
490#if IS_ENABLED(CONFIG_IPV6)
491 case ETH_P_IPV6:
492#endif
493 break;
494 default:
495 goto err;
496 }
497
498 /* Write metadata, and then pass to the receive level */
499 skb->dev = net;
500 skb->ip_summed = CHECKSUM_NONE;
501
502 /*
503 * Parse the encapsulation header. This actually does the job of
504 * converting to an ethernet-like pseudo frame header.
505 */
506 if (dev_hard_header(skb, net, ether_type,
507 is_broadcast ? net->broadcast : net->dev_addr,
508 NULL, skb->len) >= 0) {
509 struct fwnet_header *eth;
510 u16 *rawp;
511 __be16 protocol;
512
513 skb_reset_mac_header(skb);
514 skb_pull(skb, sizeof(*eth));
515 eth = (struct fwnet_header *)skb_mac_header(skb);
516 if (fwnet_hwaddr_is_multicast(eth->h_dest)) {
517 if (memcmp(eth->h_dest, net->broadcast,
518 net->addr_len) == 0)
519 skb->pkt_type = PACKET_BROADCAST;
520#if 0
521 else
522 skb->pkt_type = PACKET_MULTICAST;
523#endif
524 } else {
525 if (memcmp(eth->h_dest, net->dev_addr, net->addr_len))
526 skb->pkt_type = PACKET_OTHERHOST;
527 }
528 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN) {
529 protocol = eth->h_proto;
530 } else {
531 rawp = (u16 *)skb->data;
532 if (*rawp == 0xffff)
533 protocol = htons(ETH_P_802_3);
534 else
535 protocol = htons(ETH_P_802_2);
536 }
537 skb->protocol = protocol;
538 }
539
540 len = skb->len;
541 status = netif_rx(skb);
542 if (status == NET_RX_DROP) {
543 net->stats.rx_errors++;
544 net->stats.rx_dropped++;
545 } else {
546 net->stats.rx_packets++;
547 net->stats.rx_bytes += len;
548 }
549
550 return 0;
551
552 err:
553 net->stats.rx_errors++;
554 net->stats.rx_dropped++;
555
556 dev_kfree_skb_any(skb);
557
558 return -ENOENT;
559}
560
561static int fwnet_incoming_packet(struct fwnet_device *dev, __be32 *buf, int len,
562 int source_node_id, int generation,
563 bool is_broadcast)
564{
565 struct sk_buff *skb;
566 struct net_device *net = dev->netdev;
567 struct rfc2734_header hdr;
568 unsigned lf;
569 unsigned long flags;
570 struct fwnet_peer *peer;
571 struct fwnet_partial_datagram *pd;
572 int fg_off;
573 int dg_size;
574 u16 datagram_label;
575 int retval;
576 u16 ether_type;
577
578 if (len <= RFC2374_UNFRAG_HDR_SIZE)
579 return 0;
580
581 hdr.w0 = be32_to_cpu(buf[0]);
582 lf = fwnet_get_hdr_lf(&hdr);
583 if (lf == RFC2374_HDR_UNFRAG) {
584 /*
585 * An unfragmented datagram has been received by the ieee1394
586 * bus. Build an skbuff around it so we can pass it to the
587 * high level network layer.
588 */
589 ether_type = fwnet_get_hdr_ether_type(&hdr);
590 buf++;
591 len -= RFC2374_UNFRAG_HDR_SIZE;
592
593 skb = dev_alloc_skb(len + LL_RESERVED_SPACE(net));
594 if (unlikely(!skb)) {
595 net->stats.rx_dropped++;
596
597 return -ENOMEM;
598 }
599 skb_reserve(skb, LL_RESERVED_SPACE(net));
600 skb_put_data(skb, buf, len);
601
602 return fwnet_finish_incoming_packet(net, skb, source_node_id,
603 is_broadcast, ether_type);
604 }
605
606 /* A datagram fragment has been received, now the fun begins. */
607
608 if (len <= RFC2374_FRAG_HDR_SIZE)
609 return 0;
610
611 hdr.w1 = ntohl(buf[1]);
612 buf += 2;
613 len -= RFC2374_FRAG_HDR_SIZE;
614 if (lf == RFC2374_HDR_FIRSTFRAG) {
615 ether_type = fwnet_get_hdr_ether_type(&hdr);
616 fg_off = 0;
617 } else {
618 ether_type = 0;
619 fg_off = fwnet_get_hdr_fg_off(&hdr);
620 }
621 datagram_label = fwnet_get_hdr_dgl(&hdr);
622 dg_size = fwnet_get_hdr_dg_size(&hdr);
623
624 if (fg_off + len > dg_size)
625 return 0;
626
627 spin_lock_irqsave(&dev->lock, flags);
628
629 peer = fwnet_peer_find_by_node_id(dev, source_node_id, generation);
630 if (!peer) {
631 retval = -ENOENT;
632 goto fail;
633 }
634
635 pd = fwnet_pd_find(peer, datagram_label);
636 if (pd == NULL) {
637 while (peer->pdg_size >= FWNET_MAX_FRAGMENTS) {
638 /* remove the oldest */
639 fwnet_pd_delete(list_first_entry(&peer->pd_list,
640 struct fwnet_partial_datagram, pd_link));
641 peer->pdg_size--;
642 }
643 pd = fwnet_pd_new(net, peer, datagram_label,
644 dg_size, buf, fg_off, len);
645 if (pd == NULL) {
646 retval = -ENOMEM;
647 goto fail;
648 }
649 peer->pdg_size++;
650 } else {
651 if (fwnet_frag_overlap(pd, fg_off, len) ||
652 pd->datagram_size != dg_size) {
653 /*
654 * Differing datagram sizes or overlapping fragments,
655 * discard old datagram and start a new one.
656 */
657 fwnet_pd_delete(pd);
658 pd = fwnet_pd_new(net, peer, datagram_label,
659 dg_size, buf, fg_off, len);
660 if (pd == NULL) {
661 peer->pdg_size--;
662 retval = -ENOMEM;
663 goto fail;
664 }
665 } else {
666 if (!fwnet_pd_update(peer, pd, buf, fg_off, len)) {
667 /*
668 * Couldn't save off fragment anyway
669 * so might as well obliterate the
670 * datagram now.
671 */
672 fwnet_pd_delete(pd);
673 peer->pdg_size--;
674 retval = -ENOMEM;
675 goto fail;
676 }
677 }
678 } /* new datagram or add to existing one */
679
680 if (lf == RFC2374_HDR_FIRSTFRAG)
681 pd->ether_type = ether_type;
682
683 if (fwnet_pd_is_complete(pd)) {
684 ether_type = pd->ether_type;
685 peer->pdg_size--;
686 skb = skb_get(pd->skb);
687 fwnet_pd_delete(pd);
688
689 spin_unlock_irqrestore(&dev->lock, flags);
690
691 return fwnet_finish_incoming_packet(net, skb, source_node_id,
692 false, ether_type);
693 }
694 /*
695 * Datagram is not complete, we're done for the
696 * moment.
697 */
698 retval = 0;
699 fail:
700 spin_unlock_irqrestore(&dev->lock, flags);
701
702 return retval;
703}
704
705static void fwnet_receive_packet(struct fw_card *card, struct fw_request *r,
706 int tcode, int destination, int source, int generation,
707 unsigned long long offset, void *payload, size_t length,
708 void *callback_data)
709{
710 struct fwnet_device *dev = callback_data;
711 int rcode;
712
713 if (destination == IEEE1394_ALL_NODES) {
714 // Although the response to the broadcast packet is not necessarily required, the
715 // fw_send_response() function should still be called to maintain the reference
716 // counting of the object. In the case, the call of function just releases the
717 // object as a result to decrease the reference counting.
718 rcode = RCODE_COMPLETE;
719 } else if (offset != dev->handler.offset) {
720 rcode = RCODE_ADDRESS_ERROR;
721 } else if (tcode != TCODE_WRITE_BLOCK_REQUEST) {
722 rcode = RCODE_TYPE_ERROR;
723 } else if (fwnet_incoming_packet(dev, payload, length,
724 source, generation, false) != 0) {
725 dev_err(&dev->netdev->dev, "incoming packet failure\n");
726 rcode = RCODE_CONFLICT_ERROR;
727 } else {
728 rcode = RCODE_COMPLETE;
729 }
730
731 fw_send_response(card, r, rcode);
732}
733
734static int gasp_source_id(__be32 *p)
735{
736 return be32_to_cpu(p[0]) >> 16;
737}
738
739static u32 gasp_specifier_id(__be32 *p)
740{
741 return (be32_to_cpu(p[0]) & 0xffff) << 8 |
742 (be32_to_cpu(p[1]) & 0xff000000) >> 24;
743}
744
745static u32 gasp_version(__be32 *p)
746{
747 return be32_to_cpu(p[1]) & 0xffffff;
748}
749
750static void fwnet_receive_broadcast(struct fw_iso_context *context,
751 u32 cycle, size_t header_length, void *header, void *data)
752{
753 struct fwnet_device *dev;
754 struct fw_iso_packet packet;
755 __be16 *hdr_ptr;
756 __be32 *buf_ptr;
757 int retval;
758 u32 length;
759 unsigned long offset;
760 unsigned long flags;
761
762 dev = data;
763 hdr_ptr = header;
764 length = be16_to_cpup(hdr_ptr);
765
766 spin_lock_irqsave(&dev->lock, flags);
767
768 offset = dev->rcv_buffer_size * dev->broadcast_rcv_next_ptr;
769 buf_ptr = dev->broadcast_rcv_buffer_ptrs[dev->broadcast_rcv_next_ptr++];
770 if (dev->broadcast_rcv_next_ptr == dev->num_broadcast_rcv_ptrs)
771 dev->broadcast_rcv_next_ptr = 0;
772
773 spin_unlock_irqrestore(&dev->lock, flags);
774
775 if (length > IEEE1394_GASP_HDR_SIZE &&
776 gasp_specifier_id(buf_ptr) == IANA_SPECIFIER_ID &&
777 (gasp_version(buf_ptr) == RFC2734_SW_VERSION
778#if IS_ENABLED(CONFIG_IPV6)
779 || gasp_version(buf_ptr) == RFC3146_SW_VERSION
780#endif
781 ))
782 fwnet_incoming_packet(dev, buf_ptr + 2,
783 length - IEEE1394_GASP_HDR_SIZE,
784 gasp_source_id(buf_ptr),
785 context->card->generation, true);
786
787 packet.payload_length = dev->rcv_buffer_size;
788 packet.interrupt = 1;
789 packet.skip = 0;
790 packet.tag = 3;
791 packet.sy = 0;
792 packet.header_length = IEEE1394_GASP_HDR_SIZE;
793
794 spin_lock_irqsave(&dev->lock, flags);
795
796 retval = fw_iso_context_queue(dev->broadcast_rcv_context, &packet,
797 &dev->broadcast_rcv_buffer, offset);
798
799 spin_unlock_irqrestore(&dev->lock, flags);
800
801 if (retval >= 0)
802 fw_iso_context_queue_flush(dev->broadcast_rcv_context);
803 else
804 dev_err(&dev->netdev->dev, "requeue failed\n");
805}
806
807static struct kmem_cache *fwnet_packet_task_cache;
808
809static void fwnet_free_ptask(struct fwnet_packet_task *ptask)
810{
811 dev_kfree_skb_any(ptask->skb);
812 kmem_cache_free(fwnet_packet_task_cache, ptask);
813}
814
815/* Caller must hold dev->lock. */
816static void dec_queued_datagrams(struct fwnet_device *dev)
817{
818 if (--dev->queued_datagrams == FWNET_MIN_QUEUED_DATAGRAMS)
819 netif_wake_queue(dev->netdev);
820}
821
822static int fwnet_send_packet(struct fwnet_packet_task *ptask);
823
824static void fwnet_transmit_packet_done(struct fwnet_packet_task *ptask)
825{
826 struct fwnet_device *dev = ptask->dev;
827 struct sk_buff *skb = ptask->skb;
828 unsigned long flags;
829 bool free;
830
831 spin_lock_irqsave(&dev->lock, flags);
832
833 ptask->outstanding_pkts--;
834
835 /* Check whether we or the networking TX soft-IRQ is last user. */
836 free = (ptask->outstanding_pkts == 0 && ptask->enqueued);
837 if (free)
838 dec_queued_datagrams(dev);
839
840 if (ptask->outstanding_pkts == 0) {
841 dev->netdev->stats.tx_packets++;
842 dev->netdev->stats.tx_bytes += skb->len;
843 }
844
845 spin_unlock_irqrestore(&dev->lock, flags);
846
847 if (ptask->outstanding_pkts > 0) {
848 u16 dg_size;
849 u16 fg_off;
850 u16 datagram_label;
851 u16 lf;
852
853 /* Update the ptask to point to the next fragment and send it */
854 lf = fwnet_get_hdr_lf(&ptask->hdr);
855 switch (lf) {
856 case RFC2374_HDR_LASTFRAG:
857 case RFC2374_HDR_UNFRAG:
858 default:
859 dev_err(&dev->netdev->dev,
860 "outstanding packet %x lf %x, header %x,%x\n",
861 ptask->outstanding_pkts, lf, ptask->hdr.w0,
862 ptask->hdr.w1);
863 BUG();
864
865 case RFC2374_HDR_FIRSTFRAG:
866 /* Set frag type here for future interior fragments */
867 dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
868 fg_off = ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
869 datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
870 break;
871
872 case RFC2374_HDR_INTFRAG:
873 dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
874 fg_off = fwnet_get_hdr_fg_off(&ptask->hdr)
875 + ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
876 datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
877 break;
878 }
879
880 if (ptask->dest_node == IEEE1394_ALL_NODES) {
881 skb_pull(skb,
882 ptask->max_payload + IEEE1394_GASP_HDR_SIZE);
883 } else {
884 skb_pull(skb, ptask->max_payload);
885 }
886 if (ptask->outstanding_pkts > 1) {
887 fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_INTFRAG,
888 dg_size, fg_off, datagram_label);
889 } else {
890 fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_LASTFRAG,
891 dg_size, fg_off, datagram_label);
892 ptask->max_payload = skb->len + RFC2374_FRAG_HDR_SIZE;
893 }
894 fwnet_send_packet(ptask);
895 }
896
897 if (free)
898 fwnet_free_ptask(ptask);
899}
900
901static void fwnet_transmit_packet_failed(struct fwnet_packet_task *ptask)
902{
903 struct fwnet_device *dev = ptask->dev;
904 unsigned long flags;
905 bool free;
906
907 spin_lock_irqsave(&dev->lock, flags);
908
909 /* One fragment failed; don't try to send remaining fragments. */
910 ptask->outstanding_pkts = 0;
911
912 /* Check whether we or the networking TX soft-IRQ is last user. */
913 free = ptask->enqueued;
914 if (free)
915 dec_queued_datagrams(dev);
916
917 dev->netdev->stats.tx_dropped++;
918 dev->netdev->stats.tx_errors++;
919
920 spin_unlock_irqrestore(&dev->lock, flags);
921
922 if (free)
923 fwnet_free_ptask(ptask);
924}
925
926static void fwnet_write_complete(struct fw_card *card, int rcode,
927 void *payload, size_t length, void *data)
928{
929 struct fwnet_packet_task *ptask = data;
930 static unsigned long j;
931 static int last_rcode, errors_skipped;
932
933 if (rcode == RCODE_COMPLETE) {
934 fwnet_transmit_packet_done(ptask);
935 } else {
936 if (printk_timed_ratelimit(&j, 1000) || rcode != last_rcode) {
937 dev_err(&ptask->dev->netdev->dev,
938 "fwnet_write_complete failed: %x (skipped %d)\n",
939 rcode, errors_skipped);
940
941 errors_skipped = 0;
942 last_rcode = rcode;
943 } else {
944 errors_skipped++;
945 }
946 fwnet_transmit_packet_failed(ptask);
947 }
948}
949
950static int fwnet_send_packet(struct fwnet_packet_task *ptask)
951{
952 struct fwnet_device *dev;
953 unsigned tx_len;
954 struct rfc2734_header *bufhdr;
955 unsigned long flags;
956 bool free;
957
958 dev = ptask->dev;
959 tx_len = ptask->max_payload;
960 switch (fwnet_get_hdr_lf(&ptask->hdr)) {
961 case RFC2374_HDR_UNFRAG:
962 bufhdr = skb_push(ptask->skb, RFC2374_UNFRAG_HDR_SIZE);
963 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
964 break;
965
966 case RFC2374_HDR_FIRSTFRAG:
967 case RFC2374_HDR_INTFRAG:
968 case RFC2374_HDR_LASTFRAG:
969 bufhdr = skb_push(ptask->skb, RFC2374_FRAG_HDR_SIZE);
970 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
971 put_unaligned_be32(ptask->hdr.w1, &bufhdr->w1);
972 break;
973
974 default:
975 BUG();
976 }
977 if (ptask->dest_node == IEEE1394_ALL_NODES) {
978 u8 *p;
979 int generation;
980 int node_id;
981 unsigned int sw_version;
982
983 /* ptask->generation may not have been set yet */
984 generation = dev->card->generation;
985 smp_rmb();
986 node_id = dev->card->node_id;
987
988 switch (ptask->skb->protocol) {
989 default:
990 sw_version = RFC2734_SW_VERSION;
991 break;
992#if IS_ENABLED(CONFIG_IPV6)
993 case htons(ETH_P_IPV6):
994 sw_version = RFC3146_SW_VERSION;
995#endif
996 }
997
998 p = skb_push(ptask->skb, IEEE1394_GASP_HDR_SIZE);
999 put_unaligned_be32(node_id << 16 | IANA_SPECIFIER_ID >> 8, p);
1000 put_unaligned_be32((IANA_SPECIFIER_ID & 0xff) << 24
1001 | sw_version, &p[4]);
1002
1003 /* We should not transmit if broadcast_channel.valid == 0. */
1004 fw_send_request(dev->card, &ptask->transaction,
1005 TCODE_STREAM_DATA,
1006 fw_stream_packet_destination_id(3,
1007 IEEE1394_BROADCAST_CHANNEL, 0),
1008 generation, SCODE_100, 0ULL, ptask->skb->data,
1009 tx_len + 8, fwnet_write_complete, ptask);
1010
1011 spin_lock_irqsave(&dev->lock, flags);
1012
1013 /* If the AT work item already ran, we may be last user. */
1014 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1015 if (!free)
1016 ptask->enqueued = true;
1017 else
1018 dec_queued_datagrams(dev);
1019
1020 spin_unlock_irqrestore(&dev->lock, flags);
1021
1022 goto out;
1023 }
1024
1025 fw_send_request(dev->card, &ptask->transaction,
1026 TCODE_WRITE_BLOCK_REQUEST, ptask->dest_node,
1027 ptask->generation, ptask->speed, ptask->fifo_addr,
1028 ptask->skb->data, tx_len, fwnet_write_complete, ptask);
1029
1030 spin_lock_irqsave(&dev->lock, flags);
1031
1032 /* If the AT work item already ran, we may be last user. */
1033 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1034 if (!free)
1035 ptask->enqueued = true;
1036 else
1037 dec_queued_datagrams(dev);
1038
1039 spin_unlock_irqrestore(&dev->lock, flags);
1040
1041 netif_trans_update(dev->netdev);
1042 out:
1043 if (free)
1044 fwnet_free_ptask(ptask);
1045
1046 return 0;
1047}
1048
1049static void fwnet_fifo_stop(struct fwnet_device *dev)
1050{
1051 if (dev->local_fifo == FWNET_NO_FIFO_ADDR)
1052 return;
1053
1054 fw_core_remove_address_handler(&dev->handler);
1055 dev->local_fifo = FWNET_NO_FIFO_ADDR;
1056}
1057
1058static int fwnet_fifo_start(struct fwnet_device *dev)
1059{
1060 int retval;
1061
1062 if (dev->local_fifo != FWNET_NO_FIFO_ADDR)
1063 return 0;
1064
1065 dev->handler.length = 4096;
1066 dev->handler.address_callback = fwnet_receive_packet;
1067 dev->handler.callback_data = dev;
1068
1069 retval = fw_core_add_address_handler(&dev->handler,
1070 &fw_high_memory_region);
1071 if (retval < 0)
1072 return retval;
1073
1074 dev->local_fifo = dev->handler.offset;
1075
1076 return 0;
1077}
1078
1079static void __fwnet_broadcast_stop(struct fwnet_device *dev)
1080{
1081 unsigned u;
1082
1083 if (dev->broadcast_state != FWNET_BROADCAST_ERROR) {
1084 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++)
1085 kunmap(dev->broadcast_rcv_buffer.pages[u]);
1086 fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer, dev->card);
1087 }
1088 if (dev->broadcast_rcv_context) {
1089 fw_iso_context_destroy(dev->broadcast_rcv_context);
1090 dev->broadcast_rcv_context = NULL;
1091 }
1092 kfree(dev->broadcast_rcv_buffer_ptrs);
1093 dev->broadcast_rcv_buffer_ptrs = NULL;
1094 dev->broadcast_state = FWNET_BROADCAST_ERROR;
1095}
1096
1097static void fwnet_broadcast_stop(struct fwnet_device *dev)
1098{
1099 if (dev->broadcast_state == FWNET_BROADCAST_ERROR)
1100 return;
1101 fw_iso_context_stop(dev->broadcast_rcv_context);
1102 __fwnet_broadcast_stop(dev);
1103}
1104
1105static int fwnet_broadcast_start(struct fwnet_device *dev)
1106{
1107 struct fw_iso_context *context;
1108 int retval;
1109 unsigned num_packets;
1110 unsigned max_receive;
1111 struct fw_iso_packet packet;
1112 unsigned long offset;
1113 void **ptrptr;
1114 unsigned u;
1115
1116 if (dev->broadcast_state != FWNET_BROADCAST_ERROR)
1117 return 0;
1118
1119 max_receive = 1U << (dev->card->max_receive + 1);
1120 num_packets = (FWNET_ISO_PAGE_COUNT * PAGE_SIZE) / max_receive;
1121
1122 ptrptr = kmalloc_array(num_packets, sizeof(void *), GFP_KERNEL);
1123 if (!ptrptr) {
1124 retval = -ENOMEM;
1125 goto failed;
1126 }
1127 dev->broadcast_rcv_buffer_ptrs = ptrptr;
1128
1129 context = fw_iso_context_create(dev->card, FW_ISO_CONTEXT_RECEIVE,
1130 IEEE1394_BROADCAST_CHANNEL,
1131 dev->card->link_speed, 8,
1132 fwnet_receive_broadcast, dev);
1133 if (IS_ERR(context)) {
1134 retval = PTR_ERR(context);
1135 goto failed;
1136 }
1137
1138 retval = fw_iso_buffer_init(&dev->broadcast_rcv_buffer, dev->card,
1139 FWNET_ISO_PAGE_COUNT, DMA_FROM_DEVICE);
1140 if (retval < 0)
1141 goto failed;
1142
1143 dev->broadcast_state = FWNET_BROADCAST_STOPPED;
1144
1145 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++) {
1146 void *ptr;
1147 unsigned v;
1148
1149 ptr = kmap(dev->broadcast_rcv_buffer.pages[u]);
1150 for (v = 0; v < num_packets / FWNET_ISO_PAGE_COUNT; v++)
1151 *ptrptr++ = (void *) ((char *)ptr + v * max_receive);
1152 }
1153 dev->broadcast_rcv_context = context;
1154
1155 packet.payload_length = max_receive;
1156 packet.interrupt = 1;
1157 packet.skip = 0;
1158 packet.tag = 3;
1159 packet.sy = 0;
1160 packet.header_length = IEEE1394_GASP_HDR_SIZE;
1161 offset = 0;
1162
1163 for (u = 0; u < num_packets; u++) {
1164 retval = fw_iso_context_queue(context, &packet,
1165 &dev->broadcast_rcv_buffer, offset);
1166 if (retval < 0)
1167 goto failed;
1168
1169 offset += max_receive;
1170 }
1171 dev->num_broadcast_rcv_ptrs = num_packets;
1172 dev->rcv_buffer_size = max_receive;
1173 dev->broadcast_rcv_next_ptr = 0U;
1174 retval = fw_iso_context_start(context, -1, 0,
1175 FW_ISO_CONTEXT_MATCH_ALL_TAGS); /* ??? sync */
1176 if (retval < 0)
1177 goto failed;
1178
1179 /* FIXME: adjust it according to the min. speed of all known peers? */
1180 dev->broadcast_xmt_max_payload = IEEE1394_MAX_PAYLOAD_S100
1181 - IEEE1394_GASP_HDR_SIZE - RFC2374_UNFRAG_HDR_SIZE;
1182 dev->broadcast_state = FWNET_BROADCAST_RUNNING;
1183
1184 return 0;
1185
1186 failed:
1187 __fwnet_broadcast_stop(dev);
1188 return retval;
1189}
1190
1191static void set_carrier_state(struct fwnet_device *dev)
1192{
1193 if (dev->peer_count > 1)
1194 netif_carrier_on(dev->netdev);
1195 else
1196 netif_carrier_off(dev->netdev);
1197}
1198
1199/* ifup */
1200static int fwnet_open(struct net_device *net)
1201{
1202 struct fwnet_device *dev = netdev_priv(net);
1203 int ret;
1204
1205 ret = fwnet_broadcast_start(dev);
1206 if (ret)
1207 return ret;
1208
1209 netif_start_queue(net);
1210
1211 spin_lock_irq(&dev->lock);
1212 set_carrier_state(dev);
1213 spin_unlock_irq(&dev->lock);
1214
1215 return 0;
1216}
1217
1218/* ifdown */
1219static int fwnet_stop(struct net_device *net)
1220{
1221 struct fwnet_device *dev = netdev_priv(net);
1222
1223 netif_stop_queue(net);
1224 fwnet_broadcast_stop(dev);
1225
1226 return 0;
1227}
1228
1229static netdev_tx_t fwnet_tx(struct sk_buff *skb, struct net_device *net)
1230{
1231 struct fwnet_header hdr_buf;
1232 struct fwnet_device *dev = netdev_priv(net);
1233 __be16 proto;
1234 u16 dest_node;
1235 unsigned max_payload;
1236 u16 dg_size;
1237 u16 *datagram_label_ptr;
1238 struct fwnet_packet_task *ptask;
1239 struct fwnet_peer *peer;
1240 unsigned long flags;
1241
1242 spin_lock_irqsave(&dev->lock, flags);
1243
1244 /* Can this happen? */
1245 if (netif_queue_stopped(dev->netdev)) {
1246 spin_unlock_irqrestore(&dev->lock, flags);
1247
1248 return NETDEV_TX_BUSY;
1249 }
1250
1251 ptask = kmem_cache_alloc(fwnet_packet_task_cache, GFP_ATOMIC);
1252 if (ptask == NULL)
1253 goto fail;
1254
1255 skb = skb_share_check(skb, GFP_ATOMIC);
1256 if (!skb)
1257 goto fail;
1258
1259 /*
1260 * Make a copy of the driver-specific header.
1261 * We might need to rebuild the header on tx failure.
1262 */
1263 memcpy(&hdr_buf, skb->data, sizeof(hdr_buf));
1264 proto = hdr_buf.h_proto;
1265
1266 switch (proto) {
1267 case htons(ETH_P_ARP):
1268 case htons(ETH_P_IP):
1269#if IS_ENABLED(CONFIG_IPV6)
1270 case htons(ETH_P_IPV6):
1271#endif
1272 break;
1273 default:
1274 goto fail;
1275 }
1276
1277 skb_pull(skb, sizeof(hdr_buf));
1278 dg_size = skb->len;
1279
1280 /*
1281 * Set the transmission type for the packet. ARP packets and IP
1282 * broadcast packets are sent via GASP.
1283 */
1284 if (fwnet_hwaddr_is_multicast(hdr_buf.h_dest)) {
1285 max_payload = dev->broadcast_xmt_max_payload;
1286 datagram_label_ptr = &dev->broadcast_xmt_datagramlabel;
1287
1288 ptask->fifo_addr = FWNET_NO_FIFO_ADDR;
1289 ptask->generation = 0;
1290 ptask->dest_node = IEEE1394_ALL_NODES;
1291 ptask->speed = SCODE_100;
1292 } else {
1293 union fwnet_hwaddr *ha = (union fwnet_hwaddr *)hdr_buf.h_dest;
1294 __be64 guid = get_unaligned(&ha->uc.uniq_id);
1295 u8 generation;
1296
1297 peer = fwnet_peer_find_by_guid(dev, be64_to_cpu(guid));
1298 if (!peer)
1299 goto fail;
1300
1301 generation = peer->generation;
1302 dest_node = peer->node_id;
1303 max_payload = peer->max_payload;
1304 datagram_label_ptr = &peer->datagram_label;
1305
1306 ptask->fifo_addr = get_unaligned_be48(ha->uc.fifo);
1307 ptask->generation = generation;
1308 ptask->dest_node = dest_node;
1309 ptask->speed = peer->speed;
1310 }
1311
1312 ptask->hdr.w0 = 0;
1313 ptask->hdr.w1 = 0;
1314 ptask->skb = skb;
1315 ptask->dev = dev;
1316
1317 /* Does it all fit in one packet? */
1318 if (dg_size <= max_payload) {
1319 fwnet_make_uf_hdr(&ptask->hdr, ntohs(proto));
1320 ptask->outstanding_pkts = 1;
1321 max_payload = dg_size + RFC2374_UNFRAG_HDR_SIZE;
1322 } else {
1323 u16 datagram_label;
1324
1325 max_payload -= RFC2374_FRAG_OVERHEAD;
1326 datagram_label = (*datagram_label_ptr)++;
1327 fwnet_make_ff_hdr(&ptask->hdr, ntohs(proto), dg_size,
1328 datagram_label);
1329 ptask->outstanding_pkts = DIV_ROUND_UP(dg_size, max_payload);
1330 max_payload += RFC2374_FRAG_HDR_SIZE;
1331 }
1332
1333 if (++dev->queued_datagrams == FWNET_MAX_QUEUED_DATAGRAMS)
1334 netif_stop_queue(dev->netdev);
1335
1336 spin_unlock_irqrestore(&dev->lock, flags);
1337
1338 ptask->max_payload = max_payload;
1339 ptask->enqueued = 0;
1340
1341 fwnet_send_packet(ptask);
1342
1343 return NETDEV_TX_OK;
1344
1345 fail:
1346 spin_unlock_irqrestore(&dev->lock, flags);
1347
1348 if (ptask)
1349 kmem_cache_free(fwnet_packet_task_cache, ptask);
1350
1351 if (skb != NULL)
1352 dev_kfree_skb(skb);
1353
1354 net->stats.tx_dropped++;
1355 net->stats.tx_errors++;
1356
1357 /*
1358 * FIXME: According to a patch from 2003-02-26, "returning non-zero
1359 * causes serious problems" here, allegedly. Before that patch,
1360 * -ERRNO was returned which is not appropriate under Linux 2.6.
1361 * Perhaps more needs to be done? Stop the queue in serious
1362 * conditions and restart it elsewhere?
1363 */
1364 return NETDEV_TX_OK;
1365}
1366
1367static const struct ethtool_ops fwnet_ethtool_ops = {
1368 .get_link = ethtool_op_get_link,
1369};
1370
1371static const struct net_device_ops fwnet_netdev_ops = {
1372 .ndo_open = fwnet_open,
1373 .ndo_stop = fwnet_stop,
1374 .ndo_start_xmit = fwnet_tx,
1375};
1376
1377static void fwnet_init_dev(struct net_device *net)
1378{
1379 net->header_ops = &fwnet_header_ops;
1380 net->netdev_ops = &fwnet_netdev_ops;
1381 net->watchdog_timeo = 2 * HZ;
1382 net->flags = IFF_BROADCAST | IFF_MULTICAST;
1383 net->features = NETIF_F_HIGHDMA;
1384 net->addr_len = FWNET_ALEN;
1385 net->hard_header_len = FWNET_HLEN;
1386 net->type = ARPHRD_IEEE1394;
1387 net->tx_queue_len = FWNET_TX_QUEUE_LEN;
1388 net->ethtool_ops = &fwnet_ethtool_ops;
1389}
1390
1391/* caller must hold fwnet_device_mutex */
1392static struct fwnet_device *fwnet_dev_find(struct fw_card *card)
1393{
1394 struct fwnet_device *dev;
1395
1396 list_for_each_entry(dev, &fwnet_device_list, dev_link)
1397 if (dev->card == card)
1398 return dev;
1399
1400 return NULL;
1401}
1402
1403static int fwnet_add_peer(struct fwnet_device *dev,
1404 struct fw_unit *unit, struct fw_device *device)
1405{
1406 struct fwnet_peer *peer;
1407
1408 peer = kmalloc_obj(*peer);
1409 if (!peer)
1410 return -ENOMEM;
1411
1412 dev_set_drvdata(&unit->device, peer);
1413
1414 peer->dev = dev;
1415 peer->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4];
1416 INIT_LIST_HEAD(&peer->pd_list);
1417 peer->pdg_size = 0;
1418 peer->datagram_label = 0;
1419 peer->speed = device->max_speed;
1420 peer->max_payload = fwnet_max_payload(device->max_rec, peer->speed);
1421
1422 peer->generation = device->generation;
1423 smp_rmb();
1424 peer->node_id = device->node_id;
1425
1426 spin_lock_irq(&dev->lock);
1427 list_add_tail(&peer->peer_link, &dev->peer_list);
1428 dev->peer_count++;
1429 set_carrier_state(dev);
1430 spin_unlock_irq(&dev->lock);
1431
1432 return 0;
1433}
1434
1435static int fwnet_probe(struct fw_unit *unit,
1436 const struct ieee1394_device_id *id)
1437{
1438 struct fw_device *device = fw_parent_device(unit);
1439 struct fw_card *card = device->card;
1440 struct net_device *net;
1441 bool allocated_netdev = false;
1442 struct fwnet_device *dev;
1443 union fwnet_hwaddr ha;
1444 int ret;
1445
1446 mutex_lock(&fwnet_device_mutex);
1447
1448 dev = fwnet_dev_find(card);
1449 if (dev) {
1450 net = dev->netdev;
1451 goto have_dev;
1452 }
1453
1454 net = alloc_netdev(sizeof(*dev), "firewire%d", NET_NAME_UNKNOWN,
1455 fwnet_init_dev);
1456 if (net == NULL) {
1457 mutex_unlock(&fwnet_device_mutex);
1458 return -ENOMEM;
1459 }
1460
1461 allocated_netdev = true;
1462 SET_NETDEV_DEV(net, card->device);
1463 dev = netdev_priv(net);
1464
1465 spin_lock_init(&dev->lock);
1466 dev->broadcast_state = FWNET_BROADCAST_ERROR;
1467 dev->broadcast_rcv_context = NULL;
1468 dev->broadcast_xmt_max_payload = 0;
1469 dev->broadcast_xmt_datagramlabel = 0;
1470 dev->local_fifo = FWNET_NO_FIFO_ADDR;
1471 dev->queued_datagrams = 0;
1472 INIT_LIST_HEAD(&dev->peer_list);
1473 dev->card = card;
1474 dev->netdev = net;
1475
1476 ret = fwnet_fifo_start(dev);
1477 if (ret < 0)
1478 goto out;
1479 dev->local_fifo = dev->handler.offset;
1480
1481 /*
1482 * default MTU: RFC 2734 cl. 4, RFC 3146 cl. 4
1483 * maximum MTU: RFC 2734 cl. 4.2, fragment encapsulation header's
1484 * maximum possible datagram_size + 1 = 0xfff + 1
1485 */
1486 net->mtu = 1500U;
1487 net->min_mtu = ETH_MIN_MTU;
1488 net->max_mtu = 4096U;
1489
1490 /* Set our hardware address while we're at it */
1491 ha.uc.uniq_id = cpu_to_be64(card->guid);
1492 ha.uc.max_rec = dev->card->max_receive;
1493 ha.uc.sspd = dev->card->link_speed;
1494 put_unaligned_be48(dev->local_fifo, ha.uc.fifo);
1495 dev_addr_set(net, ha.u);
1496
1497 memset(net->broadcast, -1, net->addr_len);
1498
1499 ret = register_netdev(net);
1500 if (ret)
1501 goto out;
1502
1503 list_add_tail(&dev->dev_link, &fwnet_device_list);
1504 dev_notice(&net->dev, "IP over IEEE 1394 on card %s\n",
1505 dev_name(card->device));
1506 have_dev:
1507 ret = fwnet_add_peer(dev, unit, device);
1508 if (ret && allocated_netdev) {
1509 unregister_netdev(net);
1510 list_del(&dev->dev_link);
1511 out:
1512 fwnet_fifo_stop(dev);
1513 free_netdev(net);
1514 }
1515
1516 mutex_unlock(&fwnet_device_mutex);
1517
1518 return ret;
1519}
1520
1521/*
1522 * FIXME abort partially sent fragmented datagrams,
1523 * discard partially received fragmented datagrams
1524 */
1525static void fwnet_update(struct fw_unit *unit)
1526{
1527 struct fw_device *device = fw_parent_device(unit);
1528 struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1529 int generation;
1530
1531 generation = device->generation;
1532
1533 spin_lock_irq(&peer->dev->lock);
1534 peer->node_id = device->node_id;
1535 peer->generation = generation;
1536 spin_unlock_irq(&peer->dev->lock);
1537}
1538
1539static void fwnet_remove_peer(struct fwnet_peer *peer, struct fwnet_device *dev)
1540{
1541 struct fwnet_partial_datagram *pd, *pd_next;
1542
1543 spin_lock_irq(&dev->lock);
1544 list_del(&peer->peer_link);
1545 dev->peer_count--;
1546 set_carrier_state(dev);
1547 spin_unlock_irq(&dev->lock);
1548
1549 list_for_each_entry_safe(pd, pd_next, &peer->pd_list, pd_link)
1550 fwnet_pd_delete(pd);
1551
1552 kfree(peer);
1553}
1554
1555static void fwnet_remove(struct fw_unit *unit)
1556{
1557 struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1558 struct fwnet_device *dev = peer->dev;
1559 struct net_device *net;
1560 int i;
1561
1562 mutex_lock(&fwnet_device_mutex);
1563
1564 net = dev->netdev;
1565
1566 fwnet_remove_peer(peer, dev);
1567
1568 if (list_empty(&dev->peer_list)) {
1569 unregister_netdev(net);
1570
1571 fwnet_fifo_stop(dev);
1572
1573 for (i = 0; dev->queued_datagrams && i < 5; i++)
1574 ssleep(1);
1575 WARN_ON(dev->queued_datagrams);
1576 list_del(&dev->dev_link);
1577
1578 free_netdev(net);
1579 }
1580
1581 mutex_unlock(&fwnet_device_mutex);
1582}
1583
1584static const struct ieee1394_device_id fwnet_id_table[] = {
1585 {
1586 .match_flags = IEEE1394_MATCH_SPECIFIER_ID |
1587 IEEE1394_MATCH_VERSION,
1588 .specifier_id = IANA_SPECIFIER_ID,
1589 .version = RFC2734_SW_VERSION,
1590 },
1591#if IS_ENABLED(CONFIG_IPV6)
1592 {
1593 .match_flags = IEEE1394_MATCH_SPECIFIER_ID |
1594 IEEE1394_MATCH_VERSION,
1595 .specifier_id = IANA_SPECIFIER_ID,
1596 .version = RFC3146_SW_VERSION,
1597 },
1598#endif
1599 { }
1600};
1601
1602static struct fw_driver fwnet_driver = {
1603 .driver = {
1604 .owner = THIS_MODULE,
1605 .name = KBUILD_MODNAME,
1606 .bus = &fw_bus_type,
1607 },
1608 .probe = fwnet_probe,
1609 .update = fwnet_update,
1610 .remove = fwnet_remove,
1611 .id_table = fwnet_id_table,
1612};
1613
1614static const u32 rfc2374_unit_directory_data[] = {
1615 0x00040000, /* directory_length */
1616 0x1200005e, /* unit_specifier_id: IANA */
1617 0x81000003, /* textual descriptor offset */
1618 0x13000001, /* unit_sw_version: RFC 2734 */
1619 0x81000005, /* textual descriptor offset */
1620 0x00030000, /* descriptor_length */
1621 0x00000000, /* text */
1622 0x00000000, /* minimal ASCII, en */
1623 0x49414e41, /* I A N A */
1624 0x00030000, /* descriptor_length */
1625 0x00000000, /* text */
1626 0x00000000, /* minimal ASCII, en */
1627 0x49507634, /* I P v 4 */
1628};
1629
1630static struct fw_descriptor rfc2374_unit_directory = {
1631 .length = ARRAY_SIZE(rfc2374_unit_directory_data),
1632 .key = (CSR_DIRECTORY | CSR_UNIT) << 24,
1633 .data = rfc2374_unit_directory_data
1634};
1635
1636#if IS_ENABLED(CONFIG_IPV6)
1637static const u32 rfc3146_unit_directory_data[] = {
1638 0x00040000, /* directory_length */
1639 0x1200005e, /* unit_specifier_id: IANA */
1640 0x81000003, /* textual descriptor offset */
1641 0x13000002, /* unit_sw_version: RFC 3146 */
1642 0x81000005, /* textual descriptor offset */
1643 0x00030000, /* descriptor_length */
1644 0x00000000, /* text */
1645 0x00000000, /* minimal ASCII, en */
1646 0x49414e41, /* I A N A */
1647 0x00030000, /* descriptor_length */
1648 0x00000000, /* text */
1649 0x00000000, /* minimal ASCII, en */
1650 0x49507636, /* I P v 6 */
1651};
1652
1653static struct fw_descriptor rfc3146_unit_directory = {
1654 .length = ARRAY_SIZE(rfc3146_unit_directory_data),
1655 .key = (CSR_DIRECTORY | CSR_UNIT) << 24,
1656 .data = rfc3146_unit_directory_data
1657};
1658#endif
1659
1660static int __init fwnet_init(void)
1661{
1662 int err;
1663
1664 err = fw_core_add_descriptor(&rfc2374_unit_directory);
1665 if (err)
1666 return err;
1667
1668#if IS_ENABLED(CONFIG_IPV6)
1669 err = fw_core_add_descriptor(&rfc3146_unit_directory);
1670 if (err)
1671 goto out;
1672#endif
1673
1674 fwnet_packet_task_cache = kmem_cache_create("packet_task",
1675 sizeof(struct fwnet_packet_task), 0, 0, NULL);
1676 if (!fwnet_packet_task_cache) {
1677 err = -ENOMEM;
1678 goto out2;
1679 }
1680
1681 err = driver_register(&fwnet_driver.driver);
1682 if (!err)
1683 return 0;
1684
1685 kmem_cache_destroy(fwnet_packet_task_cache);
1686out2:
1687#if IS_ENABLED(CONFIG_IPV6)
1688 fw_core_remove_descriptor(&rfc3146_unit_directory);
1689out:
1690#endif
1691 fw_core_remove_descriptor(&rfc2374_unit_directory);
1692
1693 return err;
1694}
1695module_init(fwnet_init);
1696
1697static void __exit fwnet_cleanup(void)
1698{
1699 driver_unregister(&fwnet_driver.driver);
1700 kmem_cache_destroy(fwnet_packet_task_cache);
1701#if IS_ENABLED(CONFIG_IPV6)
1702 fw_core_remove_descriptor(&rfc3146_unit_directory);
1703#endif
1704 fw_core_remove_descriptor(&rfc2374_unit_directory);
1705}
1706module_exit(fwnet_cleanup);
1707
1708MODULE_AUTHOR("Jay Fenlason <[email protected]>");
1709MODULE_DESCRIPTION("IP over IEEE1394 as per RFC 2734/3146");
1710MODULE_LICENSE("GPL");
1711MODULE_DEVICE_TABLE(ieee1394, fwnet_id_table);