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CommitLineData
c76acec6
JF
1/*
2 * IPv4 over IEEE 1394, per RFC 2734
cb6bf355 3 * IPv6 over IEEE 1394, per RFC 3146
c76acec6
JF
4 *
5 * Copyright (C) 2009 Jay Fenlason <fenlason@redhat.com>
6 *
7 * based on eth1394 by Ben Collins et al
8 */
9
f91e3bd8 10#include <linux/bug.h>
bf337b15 11#include <linux/compiler.h>
48553011 12#include <linux/delay.h>
c76acec6 13#include <linux/device.h>
c1671470 14#include <linux/ethtool.h>
c76acec6
JF
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>
f91e3bd8 20#include <linux/jiffies.h>
c76acec6
JF
21#include <linux/mod_devicetable.h>
22#include <linux/module.h>
23#include <linux/moduleparam.h>
5a124d38 24#include <linux/mutex.h>
c76acec6
JF
25#include <linux/netdevice.h>
26#include <linux/skbuff.h>
5a0e3ad6 27#include <linux/slab.h>
5a124d38 28#include <linux/spinlock.h>
c76acec6
JF
29
30#include <asm/unaligned.h>
31#include <net/arp.h>
6752c8db 32#include <net/firewire.h>
c76acec6 33
b2268830
SR
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 /* ? */
c76acec6 42
f91e3bd8
SR
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)
c76acec6 47
f91e3bd8
SR
48#define IANA_SPECIFIER_ID 0x00005eU
49#define RFC2734_SW_VERSION 0x000001U
cb6bf355 50#define RFC3146_SW_VERSION 0x000002U
c76acec6 51
f91e3bd8 52#define IEEE1394_GASP_HDR_SIZE 8
c76acec6 53
f91e3bd8
SR
54#define RFC2374_UNFRAG_HDR_SIZE 4
55#define RFC2374_FRAG_HDR_SIZE 8
56#define RFC2374_FRAG_OVERHEAD 4
c76acec6 57
f91e3bd8
SR
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 */
c76acec6 62
021b97e4
YH
63static bool fwnet_hwaddr_is_multicast(u8 *ha)
64{
65 return !!(*ha & 1);
66}
67
f91e3bd8
SR
68/* IPv4 and IPv6 encapsulation header */
69struct rfc2734_header {
c76acec6
JF
70 u32 w0;
71 u32 w1;
72};
73
f91e3bd8
SR
74#define fwnet_get_hdr_lf(h) (((h)->w0 & 0xc0000000) >> 30)
75#define fwnet_get_hdr_ether_type(h) (((h)->w0 & 0x0000ffff))
e9300a4b 76#define fwnet_get_hdr_dg_size(h) ((((h)->w0 & 0x0fff0000) >> 16) + 1)
f91e3bd8
SR
77#define fwnet_get_hdr_fg_off(h) (((h)->w0 & 0x00000fff))
78#define fwnet_get_hdr_dgl(h) (((h)->w1 & 0xffff0000) >> 16)
c76acec6 79
e9300a4b 80#define fwnet_set_hdr_lf(lf) ((lf) << 30)
f91e3bd8 81#define fwnet_set_hdr_ether_type(et) (et)
e9300a4b 82#define fwnet_set_hdr_dg_size(dgs) (((dgs) - 1) << 16)
f91e3bd8 83#define fwnet_set_hdr_fg_off(fgo) (fgo)
c76acec6 84
f91e3bd8 85#define fwnet_set_hdr_dgl(dgl) ((dgl) << 16)
c76acec6 86
f91e3bd8
SR
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}
c76acec6 93
f91e3bd8
SR
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}
c76acec6 102
f91e3bd8
SR
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}
c76acec6
JF
111
112/* This list keeps track of what parts of the datagram have been filled in */
f91e3bd8
SR
113struct fwnet_fragment_info {
114 struct list_head fi_link;
c76acec6
JF
115 u16 offset;
116 u16 len;
117};
118
f91e3bd8
SR
119struct fwnet_partial_datagram {
120 struct list_head pd_link;
121 struct list_head fi_list;
c76acec6
JF
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
5a124d38
SR
130static DEFINE_MUTEX(fwnet_device_mutex);
131static LIST_HEAD(fwnet_device_list);
c76acec6 132
f91e3bd8 133struct fwnet_device {
5a124d38 134 struct list_head dev_link;
c76acec6 135 spinlock_t lock;
f91e3bd8
SR
136 enum {
137 FWNET_BROADCAST_ERROR,
138 FWNET_BROADCAST_RUNNING,
139 FWNET_BROADCAST_STOPPED,
140 } broadcast_state;
c76acec6
JF
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 /*
f91e3bd8 156 * The CSR address that remote nodes must send datagrams to for us to
c76acec6
JF
157 * receive them.
158 */
159 struct fw_address_handler handler;
160 u64 local_fifo;
161
48553011
SR
162 /* Number of tx datagrams that have been queued but not yet acked */
163 int queued_datagrams;
c76acec6 164
c1671470 165 int peer_count;
5a124d38 166 struct list_head peer_list;
c76acec6 167 struct fw_card *card;
5a124d38
SR
168 struct net_device *netdev;
169};
170
171struct fwnet_peer {
172 struct list_head peer_link;
173 struct fwnet_device *dev;
174 u64 guid;
5a124d38
SR
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 */
48553011 181 u16 max_payload; /* includes RFC2374_FRAG_HDR_SIZE overhead */
5a124d38
SR
182 int node_id;
183 int generation;
184 unsigned speed;
c76acec6
JF
185};
186
187/* This is our task struct. It's used for the packet complete callback. */
f91e3bd8 188struct fwnet_packet_task {
c76acec6 189 struct fw_transaction transaction;
f91e3bd8 190 struct rfc2734_header hdr;
c76acec6 191 struct sk_buff *skb;
f91e3bd8
SR
192 struct fwnet_device *dev;
193
c76acec6 194 int outstanding_pkts;
c76acec6
JF
195 u64 fifo_addr;
196 u16 dest_node;
48553011 197 u16 max_payload;
c76acec6
JF
198 u8 generation;
199 u8 speed;
48553011 200 u8 enqueued;
c76acec6
JF
201};
202
6752c8db
YH
203/*
204 * Get fifo address embedded in hwaddr
205 */
206static __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
f91e3bd8
SR
212/*
213 * saddr == NULL means use device source address.
214 * daddr == NULL means leave destination address (eg unresolved arp).
215 */
216static 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;
c76acec6 221
f91e3bd8
SR
222 h = (struct fwnet_header *)skb_push(skb, sizeof(*h));
223 put_unaligned_be16(type, &h->h_proto);
c76acec6 224
f91e3bd8
SR
225 if (net->flags & (IFF_LOOPBACK | IFF_NOARP)) {
226 memset(h->h_dest, 0, net->addr_len);
c76acec6 227
f91e3bd8 228 return net->hard_header_len;
c76acec6
JF
229 }
230
231 if (daddr) {
f91e3bd8
SR
232 memcpy(h->h_dest, daddr, net->addr_len);
233
234 return net->hard_header_len;
c76acec6
JF
235 }
236
f91e3bd8 237 return -net->hard_header_len;
c76acec6
JF
238}
239
f91e3bd8 240static int fwnet_header_cache(const struct neighbour *neigh,
e69dd336 241 struct hh_cache *hh, __be16 type)
f91e3bd8
SR
242{
243 struct net_device *net;
244 struct fwnet_header *h;
c76acec6 245
e69dd336 246 if (type == cpu_to_be16(ETH_P_802_3))
c76acec6 247 return -1;
f91e3bd8 248 net = neigh->dev;
82586340 249 h = (struct fwnet_header *)((u8 *)hh->hh_data + HH_DATA_OFF(sizeof(*h)));
e69dd336 250 h->h_proto = type;
f91e3bd8
SR
251 memcpy(h->h_dest, neigh->ha, net->addr_len);
252 hh->hh_len = FWNET_HLEN;
c76acec6 253
c76acec6
JF
254 return 0;
255}
256
257/* Called by Address Resolution module to notify changes in address. */
f91e3bd8
SR
258static void fwnet_header_cache_update(struct hh_cache *hh,
259 const struct net_device *net, const unsigned char *haddr)
260{
82586340 261 memcpy((u8 *)hh->hh_data + HH_DATA_OFF(FWNET_HLEN), haddr, net->addr_len);
c76acec6
JF
262}
263
f91e3bd8
SR
264static int fwnet_header_parse(const struct sk_buff *skb, unsigned char *haddr)
265{
266 memcpy(haddr, skb->dev->dev_addr, FWNET_ALEN);
267
268 return FWNET_ALEN;
c76acec6
JF
269}
270
f91e3bd8
SR
271static const struct header_ops fwnet_header_ops = {
272 .create = fwnet_header_create,
f91e3bd8
SR
273 .cache = fwnet_header_cache,
274 .cache_update = fwnet_header_cache_update,
275 .parse = fwnet_header_parse,
c76acec6
JF
276};
277
c76acec6 278/* FIXME: is this correct for all cases? */
f91e3bd8
SR
279static bool fwnet_frag_overlap(struct fwnet_partial_datagram *pd,
280 unsigned offset, unsigned len)
c76acec6 281{
f91e3bd8 282 struct fwnet_fragment_info *fi;
c76acec6
JF
283 unsigned end = offset + len;
284
f91e3bd8
SR
285 list_for_each_entry(fi, &pd->fi_list, fi_link)
286 if (offset < fi->offset + fi->len && end > fi->offset)
c76acec6 287 return true;
f91e3bd8 288
c76acec6
JF
289 return false;
290}
291
292/* Assumes that new fragment does not overlap any existing fragments */
f91e3bd8
SR
293static struct fwnet_fragment_info *fwnet_frag_new(
294 struct fwnet_partial_datagram *pd, unsigned offset, unsigned len)
295{
296 struct fwnet_fragment_info *fi, *fi2, *new;
c76acec6
JF
297 struct list_head *list;
298
f91e3bd8
SR
299 list = &pd->fi_list;
300 list_for_each_entry(fi, &pd->fi_list, fi_link) {
c76acec6
JF
301 if (fi->offset + fi->len == offset) {
302 /* The new fragment can be tacked on to the end */
303 /* Did the new fragment plug a hole? */
f91e3bd8
SR
304 fi2 = list_entry(fi->fi_link.next,
305 struct fwnet_fragment_info, fi_link);
c76acec6 306 if (fi->offset + fi->len == fi2->offset) {
c76acec6
JF
307 /* glue fragments together */
308 fi->len += len + fi2->len;
f91e3bd8 309 list_del(&fi2->fi_link);
c76acec6
JF
310 kfree(fi2);
311 } else {
c76acec6
JF
312 fi->len += len;
313 }
f91e3bd8 314
c76acec6
JF
315 return fi;
316 }
317 if (offset + len == fi->offset) {
318 /* The new fragment can be tacked on to the beginning */
319 /* Did the new fragment plug a hole? */
f91e3bd8
SR
320 fi2 = list_entry(fi->fi_link.prev,
321 struct fwnet_fragment_info, fi_link);
c76acec6
JF
322 if (fi2->offset + fi2->len == fi->offset) {
323 /* glue fragments together */
c76acec6 324 fi2->len += fi->len + len;
f91e3bd8 325 list_del(&fi->fi_link);
c76acec6 326 kfree(fi);
f91e3bd8 327
c76acec6
JF
328 return fi2;
329 }
c76acec6
JF
330 fi->offset = offset;
331 fi->len += len;
f91e3bd8 332
c76acec6
JF
333 return fi;
334 }
335 if (offset > fi->offset + fi->len) {
f91e3bd8 336 list = &fi->fi_link;
c76acec6
JF
337 break;
338 }
339 if (offset + len < fi->offset) {
f91e3bd8 340 list = fi->fi_link.prev;
c76acec6
JF
341 break;
342 }
343 }
344
345 new = kmalloc(sizeof(*new), GFP_ATOMIC);
cfb0c9d1 346 if (!new)
c76acec6 347 return NULL;
c76acec6
JF
348
349 new->offset = offset;
350 new->len = len;
f91e3bd8
SR
351 list_add(&new->fi_link, list);
352
c76acec6
JF
353 return new;
354}
355
f91e3bd8
SR
356static struct fwnet_partial_datagram *fwnet_pd_new(struct net_device *net,
357 struct fwnet_peer *peer, u16 datagram_label, unsigned dg_size,
358 void *frag_buf, unsigned frag_off, unsigned frag_len)
359{
360 struct fwnet_partial_datagram *new;
361 struct fwnet_fragment_info *fi;
c76acec6
JF
362
363 new = kmalloc(sizeof(*new), GFP_ATOMIC);
364 if (!new)
365 goto fail;
f91e3bd8
SR
366
367 INIT_LIST_HEAD(&new->fi_list);
368 fi = fwnet_frag_new(new, frag_off, frag_len);
369 if (fi == NULL)
c76acec6 370 goto fail_w_new;
f91e3bd8 371
c76acec6
JF
372 new->datagram_label = datagram_label;
373 new->datagram_size = dg_size;
82586340 374 new->skb = dev_alloc_skb(dg_size + LL_RESERVED_SPACE(net));
f91e3bd8 375 if (new->skb == NULL)
c76acec6 376 goto fail_w_fi;
f91e3bd8 377
82586340 378 skb_reserve(new->skb, LL_RESERVED_SPACE(net));
c76acec6
JF
379 new->pbuf = skb_put(new->skb, dg_size);
380 memcpy(new->pbuf + frag_off, frag_buf, frag_len);
f91e3bd8
SR
381 list_add_tail(&new->pd_link, &peer->pd_list);
382
c76acec6
JF
383 return new;
384
385fail_w_fi:
386 kfree(fi);
387fail_w_new:
388 kfree(new);
389fail:
c76acec6
JF
390 return NULL;
391}
392
f91e3bd8
SR
393static struct fwnet_partial_datagram *fwnet_pd_find(struct fwnet_peer *peer,
394 u16 datagram_label)
395{
396 struct fwnet_partial_datagram *pd;
c76acec6 397
f91e3bd8
SR
398 list_for_each_entry(pd, &peer->pd_list, pd_link)
399 if (pd->datagram_label == datagram_label)
c76acec6 400 return pd;
f91e3bd8 401
c76acec6
JF
402 return NULL;
403}
404
405
f91e3bd8
SR
406static void fwnet_pd_delete(struct fwnet_partial_datagram *old)
407{
408 struct fwnet_fragment_info *fi, *n;
c76acec6 409
f91e3bd8 410 list_for_each_entry_safe(fi, n, &old->fi_list, fi_link)
c76acec6 411 kfree(fi);
f91e3bd8
SR
412
413 list_del(&old->pd_link);
c76acec6
JF
414 dev_kfree_skb_any(old->skb);
415 kfree(old);
416}
417
f91e3bd8
SR
418static bool fwnet_pd_update(struct fwnet_peer *peer,
419 struct fwnet_partial_datagram *pd, void *frag_buf,
420 unsigned frag_off, unsigned frag_len)
421{
422 if (fwnet_frag_new(pd, frag_off, frag_len) == NULL)
c76acec6 423 return false;
f91e3bd8 424
c76acec6
JF
425 memcpy(pd->pbuf + frag_off, frag_buf, frag_len);
426
427 /*
25985edc 428 * Move list entry to beginning of list so that oldest partial
c76acec6
JF
429 * datagrams percolate to the end of the list
430 */
f91e3bd8
SR
431 list_move_tail(&pd->pd_link, &peer->pd_list);
432
c76acec6
JF
433 return true;
434}
435
f91e3bd8
SR
436static bool fwnet_pd_is_complete(struct fwnet_partial_datagram *pd)
437{
438 struct fwnet_fragment_info *fi;
c76acec6 439
f91e3bd8 440 fi = list_entry(pd->fi_list.next, struct fwnet_fragment_info, fi_link);
c76acec6 441
f91e3bd8 442 return fi->len == pd->datagram_size;
c76acec6
JF
443}
444
5a124d38 445/* caller must hold dev->lock */
f91e3bd8
SR
446static struct fwnet_peer *fwnet_peer_find_by_guid(struct fwnet_device *dev,
447 u64 guid)
448{
5a124d38 449 struct fwnet_peer *peer;
c76acec6 450
5a124d38
SR
451 list_for_each_entry(peer, &dev->peer_list, peer_link)
452 if (peer->guid == guid)
453 return peer;
c76acec6 454
5a124d38 455 return NULL;
c76acec6
JF
456}
457
5a124d38 458/* caller must hold dev->lock */
f91e3bd8 459static struct fwnet_peer *fwnet_peer_find_by_node_id(struct fwnet_device *dev,
5a124d38 460 int node_id, int generation)
f91e3bd8 461{
5a124d38 462 struct fwnet_peer *peer;
c76acec6 463
5a124d38
SR
464 list_for_each_entry(peer, &dev->peer_list, peer_link)
465 if (peer->node_id == node_id &&
466 peer->generation == generation)
467 return peer;
f91e3bd8 468
5a124d38 469 return NULL;
c76acec6
JF
470}
471
5a124d38
SR
472/* See IEEE 1394-2008 table 6-4, table 8-8, table 16-18. */
473static unsigned fwnet_max_payload(unsigned max_rec, unsigned speed)
f91e3bd8 474{
5a124d38 475 max_rec = min(max_rec, speed + 8);
4ec4a67a 476 max_rec = clamp(max_rec, 8U, 11U); /* 512...4096 */
5a124d38
SR
477
478 return (1 << (max_rec + 1)) - RFC2374_FRAG_HDR_SIZE;
c76acec6
JF
479}
480
5a124d38 481
f91e3bd8
SR
482static int fwnet_finish_incoming_packet(struct net_device *net,
483 struct sk_buff *skb, u16 source_node_id,
484 bool is_broadcast, u16 ether_type)
485{
486 struct fwnet_device *dev;
c76acec6 487 int status;
f91e3bd8 488 __be64 guid;
c76acec6 489
18406d7e
YH
490 switch (ether_type) {
491 case ETH_P_ARP:
492 case ETH_P_IP:
cb6bf355
YH
493#if IS_ENABLED(CONFIG_IPV6)
494 case ETH_P_IPV6:
495#endif
18406d7e
YH
496 break;
497 default:
498 goto err;
499 }
500
f91e3bd8 501 dev = netdev_priv(net);
c76acec6 502 /* Write metadata, and then pass to the receive level */
f91e3bd8 503 skb->dev = net;
b577d7e2 504 skb->ip_summed = CHECKSUM_NONE;
c76acec6
JF
505
506 /*
507 * Parse the encapsulation header. This actually does the job of
6752c8db 508 * converting to an ethernet-like pseudo frame header.
c76acec6 509 */
f91e3bd8
SR
510 guid = cpu_to_be64(dev->card->guid);
511 if (dev_hard_header(skb, net, ether_type,
6752c8db 512 is_broadcast ? net->broadcast : net->dev_addr,
f91e3bd8
SR
513 NULL, skb->len) >= 0) {
514 struct fwnet_header *eth;
c76acec6
JF
515 u16 *rawp;
516 __be16 protocol;
517
518 skb_reset_mac_header(skb);
519 skb_pull(skb, sizeof(*eth));
f91e3bd8 520 eth = (struct fwnet_header *)skb_mac_header(skb);
021b97e4 521 if (fwnet_hwaddr_is_multicast(eth->h_dest)) {
f91e3bd8
SR
522 if (memcmp(eth->h_dest, net->broadcast,
523 net->addr_len) == 0)
c76acec6 524 skb->pkt_type = PACKET_BROADCAST;
c76acec6
JF
525#if 0
526 else
527 skb->pkt_type = PACKET_MULTICAST;
528#endif
529 } else {
156ce867 530 if (memcmp(eth->h_dest, net->dev_addr, net->addr_len))
c76acec6 531 skb->pkt_type = PACKET_OTHERHOST;
c76acec6 532 }
e5c5d22e 533 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN) {
c76acec6
JF
534 protocol = eth->h_proto;
535 } else {
536 rawp = (u16 *)skb->data;
f91e3bd8 537 if (*rawp == 0xffff)
c76acec6 538 protocol = htons(ETH_P_802_3);
f91e3bd8 539 else
c76acec6 540 protocol = htons(ETH_P_802_2);
c76acec6
JF
541 }
542 skb->protocol = protocol;
543 }
544 status = netif_rx(skb);
f91e3bd8
SR
545 if (status == NET_RX_DROP) {
546 net->stats.rx_errors++;
547 net->stats.rx_dropped++;
c76acec6 548 } else {
f91e3bd8
SR
549 net->stats.rx_packets++;
550 net->stats.rx_bytes += skb->len;
c76acec6 551 }
f91e3bd8 552
c76acec6
JF
553 return 0;
554
18406d7e 555 err:
f91e3bd8
SR
556 net->stats.rx_errors++;
557 net->stats.rx_dropped++;
558
c76acec6 559 dev_kfree_skb_any(skb);
f91e3bd8 560
1bf145fe 561 return -ENOENT;
c76acec6
JF
562}
563
f91e3bd8 564static int fwnet_incoming_packet(struct fwnet_device *dev, __be32 *buf, int len,
5a124d38
SR
565 int source_node_id, int generation,
566 bool is_broadcast)
f91e3bd8 567{
c76acec6 568 struct sk_buff *skb;
5a124d38 569 struct net_device *net = dev->netdev;
f91e3bd8 570 struct rfc2734_header hdr;
c76acec6
JF
571 unsigned lf;
572 unsigned long flags;
f91e3bd8
SR
573 struct fwnet_peer *peer;
574 struct fwnet_partial_datagram *pd;
c76acec6
JF
575 int fg_off;
576 int dg_size;
577 u16 datagram_label;
578 int retval;
579 u16 ether_type;
580
667121ac
SR
581 if (len <= RFC2374_UNFRAG_HDR_SIZE)
582 return 0;
583
f91e3bd8
SR
584 hdr.w0 = be32_to_cpu(buf[0]);
585 lf = fwnet_get_hdr_lf(&hdr);
586 if (lf == RFC2374_HDR_UNFRAG) {
c76acec6
JF
587 /*
588 * An unfragmented datagram has been received by the ieee1394
589 * bus. Build an skbuff around it so we can pass it to the
590 * high level network layer.
591 */
f91e3bd8 592 ether_type = fwnet_get_hdr_ether_type(&hdr);
c76acec6 593 buf++;
f91e3bd8 594 len -= RFC2374_UNFRAG_HDR_SIZE;
c76acec6 595
82586340 596 skb = dev_alloc_skb(len + LL_RESERVED_SPACE(net));
c76acec6 597 if (unlikely(!skb)) {
f91e3bd8
SR
598 net->stats.rx_dropped++;
599
1bf145fe 600 return -ENOMEM;
c76acec6 601 }
82586340 602 skb_reserve(skb, LL_RESERVED_SPACE(net));
f91e3bd8
SR
603 memcpy(skb_put(skb, len), buf, len);
604
605 return fwnet_finish_incoming_packet(net, skb, source_node_id,
606 is_broadcast, ether_type);
c76acec6 607 }
667121ac 608
c76acec6 609 /* A datagram fragment has been received, now the fun begins. */
667121ac
SR
610
611 if (len <= RFC2374_FRAG_HDR_SIZE)
612 return 0;
613
c76acec6 614 hdr.w1 = ntohl(buf[1]);
f91e3bd8
SR
615 buf += 2;
616 len -= RFC2374_FRAG_HDR_SIZE;
617 if (lf == RFC2374_HDR_FIRSTFRAG) {
618 ether_type = fwnet_get_hdr_ether_type(&hdr);
c76acec6
JF
619 fg_off = 0;
620 } else {
f91e3bd8
SR
621 ether_type = 0;
622 fg_off = fwnet_get_hdr_fg_off(&hdr);
c76acec6 623 }
f91e3bd8 624 datagram_label = fwnet_get_hdr_dgl(&hdr);
e9300a4b 625 dg_size = fwnet_get_hdr_dg_size(&hdr);
f91e3bd8 626
667121ac
SR
627 if (fg_off + len > dg_size)
628 return 0;
629
5a124d38
SR
630 spin_lock_irqsave(&dev->lock, flags);
631
632 peer = fwnet_peer_find_by_node_id(dev, source_node_id, generation);
1bf145fe
SR
633 if (!peer) {
634 retval = -ENOENT;
635 goto fail;
636 }
f91e3bd8
SR
637
638 pd = fwnet_pd_find(peer, datagram_label);
c76acec6 639 if (pd == NULL) {
f91e3bd8 640 while (peer->pdg_size >= FWNET_MAX_FRAGMENTS) {
c76acec6 641 /* remove the oldest */
f91e3bd8
SR
642 fwnet_pd_delete(list_first_entry(&peer->pd_list,
643 struct fwnet_partial_datagram, pd_link));
644 peer->pdg_size--;
c76acec6 645 }
f91e3bd8
SR
646 pd = fwnet_pd_new(net, peer, datagram_label,
647 dg_size, buf, fg_off, len);
648 if (pd == NULL) {
c76acec6 649 retval = -ENOMEM;
1bf145fe 650 goto fail;
c76acec6 651 }
f91e3bd8 652 peer->pdg_size++;
c76acec6 653 } else {
f91e3bd8
SR
654 if (fwnet_frag_overlap(pd, fg_off, len) ||
655 pd->datagram_size != dg_size) {
c76acec6
JF
656 /*
657 * Differing datagram sizes or overlapping fragments,
f91e3bd8 658 * discard old datagram and start a new one.
c76acec6 659 */
f91e3bd8
SR
660 fwnet_pd_delete(pd);
661 pd = fwnet_pd_new(net, peer, datagram_label,
662 dg_size, buf, fg_off, len);
663 if (pd == NULL) {
f91e3bd8 664 peer->pdg_size--;
1bf145fe
SR
665 retval = -ENOMEM;
666 goto fail;
c76acec6
JF
667 }
668 } else {
f91e3bd8 669 if (!fwnet_pd_update(peer, pd, buf, fg_off, len)) {
c76acec6
JF
670 /*
671 * Couldn't save off fragment anyway
672 * so might as well obliterate the
673 * datagram now.
674 */
f91e3bd8
SR
675 fwnet_pd_delete(pd);
676 peer->pdg_size--;
1bf145fe
SR
677 retval = -ENOMEM;
678 goto fail;
c76acec6
JF
679 }
680 }
681 } /* new datagram or add to existing one */
682
f91e3bd8 683 if (lf == RFC2374_HDR_FIRSTFRAG)
c76acec6 684 pd->ether_type = ether_type;
f91e3bd8
SR
685
686 if (fwnet_pd_is_complete(pd)) {
c76acec6 687 ether_type = pd->ether_type;
f91e3bd8 688 peer->pdg_size--;
c76acec6 689 skb = skb_get(pd->skb);
f91e3bd8
SR
690 fwnet_pd_delete(pd);
691
5a124d38 692 spin_unlock_irqrestore(&dev->lock, flags);
f91e3bd8
SR
693
694 return fwnet_finish_incoming_packet(net, skb, source_node_id,
695 false, ether_type);
c76acec6
JF
696 }
697 /*
698 * Datagram is not complete, we're done for the
699 * moment.
700 */
b2268830 701 retval = 0;
1bf145fe 702 fail:
5a124d38 703 spin_unlock_irqrestore(&dev->lock, flags);
f91e3bd8 704
1bf145fe 705 return retval;
c76acec6
JF
706}
707
f91e3bd8
SR
708static void fwnet_receive_packet(struct fw_card *card, struct fw_request *r,
709 int tcode, int destination, int source, int generation,
33e553fe
SR
710 unsigned long long offset, void *payload, size_t length,
711 void *callback_data)
f91e3bd8 712{
00635b8e
SR
713 struct fwnet_device *dev = callback_data;
714 int rcode;
c76acec6 715
00635b8e
SR
716 if (destination == IEEE1394_ALL_NODES) {
717 kfree(r);
f91e3bd8 718
c76acec6
JF
719 return;
720 }
f91e3bd8 721
00635b8e
SR
722 if (offset != dev->handler.offset)
723 rcode = RCODE_ADDRESS_ERROR;
724 else if (tcode != TCODE_WRITE_BLOCK_REQUEST)
725 rcode = RCODE_TYPE_ERROR;
726 else if (fwnet_incoming_packet(dev, payload, length,
727 source, generation, false) != 0) {
8408dc1c 728 dev_err(&dev->netdev->dev, "incoming packet failure\n");
00635b8e
SR
729 rcode = RCODE_CONFLICT_ERROR;
730 } else
731 rcode = RCODE_COMPLETE;
f91e3bd8 732
00635b8e 733 fw_send_response(card, r, rcode);
c76acec6
JF
734}
735
667121ac
SR
736static int gasp_source_id(__be32 *p)
737{
738 return be32_to_cpu(p[0]) >> 16;
739}
740
741static u32 gasp_specifier_id(__be32 *p)
742{
743 return (be32_to_cpu(p[0]) & 0xffff) << 8 |
744 (be32_to_cpu(p[1]) & 0xff000000) >> 24;
745}
746
747static u32 gasp_version(__be32 *p)
748{
749 return be32_to_cpu(p[1]) & 0xffffff;
750}
751
f91e3bd8
SR
752static void fwnet_receive_broadcast(struct fw_iso_context *context,
753 u32 cycle, size_t header_length, void *header, void *data)
754{
755 struct fwnet_device *dev;
c76acec6 756 struct fw_iso_packet packet;
f91e3bd8
SR
757 __be16 *hdr_ptr;
758 __be32 *buf_ptr;
c76acec6
JF
759 int retval;
760 u32 length;
c76acec6
JF
761 unsigned long offset;
762 unsigned long flags;
763
f91e3bd8 764 dev = data;
c76acec6 765 hdr_ptr = header;
f91e3bd8
SR
766 length = be16_to_cpup(hdr_ptr);
767
768 spin_lock_irqsave(&dev->lock, flags);
769
770 offset = dev->rcv_buffer_size * dev->broadcast_rcv_next_ptr;
771 buf_ptr = dev->broadcast_rcv_buffer_ptrs[dev->broadcast_rcv_next_ptr++];
772 if (dev->broadcast_rcv_next_ptr == dev->num_broadcast_rcv_ptrs)
773 dev->broadcast_rcv_next_ptr = 0;
774
775 spin_unlock_irqrestore(&dev->lock, flags);
c76acec6 776
667121ac
SR
777 if (length > IEEE1394_GASP_HDR_SIZE &&
778 gasp_specifier_id(buf_ptr) == IANA_SPECIFIER_ID &&
779 (gasp_version(buf_ptr) == RFC2734_SW_VERSION
cb6bf355 780#if IS_ENABLED(CONFIG_IPV6)
667121ac 781 || gasp_version(buf_ptr) == RFC3146_SW_VERSION
cb6bf355 782#endif
667121ac
SR
783 ))
784 fwnet_incoming_packet(dev, buf_ptr + 2,
785 length - IEEE1394_GASP_HDR_SIZE,
786 gasp_source_id(buf_ptr),
9d237342 787 context->card->generation, true);
f91e3bd8
SR
788
789 packet.payload_length = dev->rcv_buffer_size;
c76acec6
JF
790 packet.interrupt = 1;
791 packet.skip = 0;
792 packet.tag = 3;
793 packet.sy = 0;
f91e3bd8
SR
794 packet.header_length = IEEE1394_GASP_HDR_SIZE;
795
796 spin_lock_irqsave(&dev->lock, flags);
c76acec6 797
f91e3bd8
SR
798 retval = fw_iso_context_queue(dev->broadcast_rcv_context, &packet,
799 &dev->broadcast_rcv_buffer, offset);
800
801 spin_unlock_irqrestore(&dev->lock, flags);
802
13882a82
CL
803 if (retval >= 0)
804 fw_iso_context_queue_flush(dev->broadcast_rcv_context);
805 else
8408dc1c 806 dev_err(&dev->netdev->dev, "requeue failed\n");
c76acec6
JF
807}
808
f91e3bd8
SR
809static struct kmem_cache *fwnet_packet_task_cache;
810
110f82d7
SR
811static void fwnet_free_ptask(struct fwnet_packet_task *ptask)
812{
813 dev_kfree_skb_any(ptask->skb);
814 kmem_cache_free(fwnet_packet_task_cache, ptask);
815}
816
b2268830
SR
817/* Caller must hold dev->lock. */
818static void dec_queued_datagrams(struct fwnet_device *dev)
819{
820 if (--dev->queued_datagrams == FWNET_MIN_QUEUED_DATAGRAMS)
821 netif_wake_queue(dev->netdev);
822}
823
f91e3bd8
SR
824static int fwnet_send_packet(struct fwnet_packet_task *ptask);
825
826static void fwnet_transmit_packet_done(struct fwnet_packet_task *ptask)
827{
110f82d7 828 struct fwnet_device *dev = ptask->dev;
902bca00 829 struct sk_buff *skb = ptask->skb;
c76acec6 830 unsigned long flags;
110f82d7 831 bool free;
f91e3bd8
SR
832
833 spin_lock_irqsave(&dev->lock, flags);
f91e3bd8 834
110f82d7
SR
835 ptask->outstanding_pkts--;
836
837 /* Check whether we or the networking TX soft-IRQ is last user. */
48553011 838 free = (ptask->outstanding_pkts == 0 && ptask->enqueued);
7ee11fa8 839 if (free)
b2268830 840 dec_queued_datagrams(dev);
110f82d7 841
902bca00 842 if (ptask->outstanding_pkts == 0) {
902bca00
SR
843 dev->netdev->stats.tx_packets++;
844 dev->netdev->stats.tx_bytes += skb->len;
845 }
110f82d7
SR
846
847 spin_unlock_irqrestore(&dev->lock, flags);
f91e3bd8
SR
848
849 if (ptask->outstanding_pkts > 0) {
c76acec6
JF
850 u16 dg_size;
851 u16 fg_off;
852 u16 datagram_label;
853 u16 lf;
c76acec6
JF
854
855 /* Update the ptask to point to the next fragment and send it */
f91e3bd8 856 lf = fwnet_get_hdr_lf(&ptask->hdr);
c76acec6 857 switch (lf) {
f91e3bd8
SR
858 case RFC2374_HDR_LASTFRAG:
859 case RFC2374_HDR_UNFRAG:
c76acec6 860 default:
8408dc1c
SR
861 dev_err(&dev->netdev->dev,
862 "outstanding packet %x lf %x, header %x,%x\n",
863 ptask->outstanding_pkts, lf, ptask->hdr.w0,
864 ptask->hdr.w1);
c76acec6
JF
865 BUG();
866
f91e3bd8 867 case RFC2374_HDR_FIRSTFRAG:
c76acec6 868 /* Set frag type here for future interior fragments */
f91e3bd8
SR
869 dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
870 fg_off = ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
871 datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
c76acec6
JF
872 break;
873
f91e3bd8
SR
874 case RFC2374_HDR_INTFRAG:
875 dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
876 fg_off = fwnet_get_hdr_fg_off(&ptask->hdr)
877 + ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
878 datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
c76acec6
JF
879 break;
880 }
902bca00 881
9d237342
SG
882 if (ptask->dest_node == IEEE1394_ALL_NODES) {
883 skb_pull(skb,
884 ptask->max_payload + IEEE1394_GASP_HDR_SIZE);
885 } else {
886 skb_pull(skb, ptask->max_payload);
887 }
f91e3bd8
SR
888 if (ptask->outstanding_pkts > 1) {
889 fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_INTFRAG,
890 dg_size, fg_off, datagram_label);
c76acec6 891 } else {
f91e3bd8
SR
892 fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_LASTFRAG,
893 dg_size, fg_off, datagram_label);
894 ptask->max_payload = skb->len + RFC2374_FRAG_HDR_SIZE;
c76acec6 895 }
f91e3bd8 896 fwnet_send_packet(ptask);
c76acec6 897 }
110f82d7
SR
898
899 if (free)
900 fwnet_free_ptask(ptask);
c76acec6
JF
901}
902
7ee11fa8
SR
903static void fwnet_transmit_packet_failed(struct fwnet_packet_task *ptask)
904{
905 struct fwnet_device *dev = ptask->dev;
906 unsigned long flags;
907 bool free;
908
909 spin_lock_irqsave(&dev->lock, flags);
910
911 /* One fragment failed; don't try to send remaining fragments. */
912 ptask->outstanding_pkts = 0;
913
914 /* Check whether we or the networking TX soft-IRQ is last user. */
48553011 915 free = ptask->enqueued;
7ee11fa8 916 if (free)
b2268830 917 dec_queued_datagrams(dev);
7ee11fa8
SR
918
919 dev->netdev->stats.tx_dropped++;
920 dev->netdev->stats.tx_errors++;
921
922 spin_unlock_irqrestore(&dev->lock, flags);
923
924 if (free)
925 fwnet_free_ptask(ptask);
926}
927
f91e3bd8
SR
928static void fwnet_write_complete(struct fw_card *card, int rcode,
929 void *payload, size_t length, void *data)
930{
c4d6fd40
ML
931 struct fwnet_packet_task *ptask = data;
932 static unsigned long j;
933 static int last_rcode, errors_skipped;
c76acec6 934
7ee11fa8 935 if (rcode == RCODE_COMPLETE) {
f91e3bd8 936 fwnet_transmit_packet_done(ptask);
7ee11fa8 937 } else {
c4d6fd40 938 if (printk_timed_ratelimit(&j, 1000) || rcode != last_rcode) {
8408dc1c
SR
939 dev_err(&ptask->dev->netdev->dev,
940 "fwnet_write_complete failed: %x (skipped %d)\n",
941 rcode, errors_skipped);
c4d6fd40
ML
942
943 errors_skipped = 0;
944 last_rcode = rcode;
89875833 945 } else {
c4d6fd40 946 errors_skipped++;
89875833
SR
947 }
948 fwnet_transmit_packet_failed(ptask);
7ee11fa8 949 }
c76acec6
JF
950}
951
f91e3bd8
SR
952static int fwnet_send_packet(struct fwnet_packet_task *ptask)
953{
954 struct fwnet_device *dev;
c76acec6 955 unsigned tx_len;
f91e3bd8 956 struct rfc2734_header *bufhdr;
c76acec6 957 unsigned long flags;
110f82d7 958 bool free;
c76acec6 959
f91e3bd8 960 dev = ptask->dev;
c76acec6 961 tx_len = ptask->max_payload;
f91e3bd8
SR
962 switch (fwnet_get_hdr_lf(&ptask->hdr)) {
963 case RFC2374_HDR_UNFRAG:
964 bufhdr = (struct rfc2734_header *)
965 skb_push(ptask->skb, RFC2374_UNFRAG_HDR_SIZE);
966 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
c76acec6
JF
967 break;
968
f91e3bd8
SR
969 case RFC2374_HDR_FIRSTFRAG:
970 case RFC2374_HDR_INTFRAG:
971 case RFC2374_HDR_LASTFRAG:
972 bufhdr = (struct rfc2734_header *)
973 skb_push(ptask->skb, RFC2374_FRAG_HDR_SIZE);
974 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
975 put_unaligned_be32(ptask->hdr.w1, &bufhdr->w1);
c76acec6
JF
976 break;
977
978 default:
979 BUG();
980 }
f91e3bd8
SR
981 if (ptask->dest_node == IEEE1394_ALL_NODES) {
982 u8 *p;
c76acec6 983 int generation;
f91e3bd8 984 int node_id;
cb6bf355 985 unsigned int sw_version;
c76acec6
JF
986
987 /* ptask->generation may not have been set yet */
f91e3bd8 988 generation = dev->card->generation;
c76acec6 989 smp_rmb();
f91e3bd8
SR
990 node_id = dev->card->node_id;
991
cb6bf355
YH
992 switch (ptask->skb->protocol) {
993 default:
994 sw_version = RFC2734_SW_VERSION;
995 break;
996#if IS_ENABLED(CONFIG_IPV6)
997 case htons(ETH_P_IPV6):
998 sw_version = RFC3146_SW_VERSION;
999#endif
1000 }
1001
9d237342 1002 p = skb_push(ptask->skb, IEEE1394_GASP_HDR_SIZE);
f91e3bd8
SR
1003 put_unaligned_be32(node_id << 16 | IANA_SPECIFIER_ID >> 8, p);
1004 put_unaligned_be32((IANA_SPECIFIER_ID & 0xff) << 24
cb6bf355 1005 | sw_version, &p[4]);
f91e3bd8
SR
1006
1007 /* We should not transmit if broadcast_channel.valid == 0. */
1008 fw_send_request(dev->card, &ptask->transaction,
1009 TCODE_STREAM_DATA,
1010 fw_stream_packet_destination_id(3,
1011 IEEE1394_BROADCAST_CHANNEL, 0),
1012 generation, SCODE_100, 0ULL, ptask->skb->data,
1013 tx_len + 8, fwnet_write_complete, ptask);
1014
f91e3bd8 1015 spin_lock_irqsave(&dev->lock, flags);
110f82d7
SR
1016
1017 /* If the AT tasklet already ran, we may be last user. */
48553011 1018 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
110f82d7 1019 if (!free)
48553011
SR
1020 ptask->enqueued = true;
1021 else
b2268830 1022 dec_queued_datagrams(dev);
110f82d7 1023
f91e3bd8
SR
1024 spin_unlock_irqrestore(&dev->lock, flags);
1025
110f82d7 1026 goto out;
c76acec6 1027 }
f91e3bd8
SR
1028
1029 fw_send_request(dev->card, &ptask->transaction,
1030 TCODE_WRITE_BLOCK_REQUEST, ptask->dest_node,
1031 ptask->generation, ptask->speed, ptask->fifo_addr,
1032 ptask->skb->data, tx_len, fwnet_write_complete, ptask);
1033
f91e3bd8 1034 spin_lock_irqsave(&dev->lock, flags);
110f82d7
SR
1035
1036 /* If the AT tasklet already ran, we may be last user. */
48553011 1037 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
110f82d7 1038 if (!free)
48553011
SR
1039 ptask->enqueued = true;
1040 else
b2268830 1041 dec_queued_datagrams(dev);
110f82d7 1042
f91e3bd8
SR
1043 spin_unlock_irqrestore(&dev->lock, flags);
1044
860e9538 1045 netif_trans_update(dev->netdev);
110f82d7
SR
1046 out:
1047 if (free)
1048 fwnet_free_ptask(ptask);
f91e3bd8 1049
c76acec6
JF
1050 return 0;
1051}
1052
9d39c90a
YH
1053static void fwnet_fifo_stop(struct fwnet_device *dev)
1054{
1055 if (dev->local_fifo == FWNET_NO_FIFO_ADDR)
1056 return;
1057
1058 fw_core_remove_address_handler(&dev->handler);
1059 dev->local_fifo = FWNET_NO_FIFO_ADDR;
1060}
1061
1062static int fwnet_fifo_start(struct fwnet_device *dev)
1063{
1064 int retval;
1065
1066 if (dev->local_fifo != FWNET_NO_FIFO_ADDR)
1067 return 0;
1068
1069 dev->handler.length = 4096;
1070 dev->handler.address_callback = fwnet_receive_packet;
1071 dev->handler.callback_data = dev;
1072
1073 retval = fw_core_add_address_handler(&dev->handler,
1074 &fw_high_memory_region);
1075 if (retval < 0)
1076 return retval;
1077
1078 dev->local_fifo = dev->handler.offset;
1079
1080 return 0;
1081}
1082
111534cd
YH
1083static void __fwnet_broadcast_stop(struct fwnet_device *dev)
1084{
1085 unsigned u;
1086
1087 if (dev->broadcast_state != FWNET_BROADCAST_ERROR) {
1088 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++)
1089 kunmap(dev->broadcast_rcv_buffer.pages[u]);
1090 fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer, dev->card);
1091 }
1092 if (dev->broadcast_rcv_context) {
1093 fw_iso_context_destroy(dev->broadcast_rcv_context);
1094 dev->broadcast_rcv_context = NULL;
1095 }
1096 kfree(dev->broadcast_rcv_buffer_ptrs);
1097 dev->broadcast_rcv_buffer_ptrs = NULL;
1098 dev->broadcast_state = FWNET_BROADCAST_ERROR;
1099}
1100
1101static void fwnet_broadcast_stop(struct fwnet_device *dev)
1102{
1103 if (dev->broadcast_state == FWNET_BROADCAST_ERROR)
1104 return;
1105 fw_iso_context_stop(dev->broadcast_rcv_context);
1106 __fwnet_broadcast_stop(dev);
1107}
1108
f91e3bd8
SR
1109static int fwnet_broadcast_start(struct fwnet_device *dev)
1110{
c76acec6
JF
1111 struct fw_iso_context *context;
1112 int retval;
1113 unsigned num_packets;
1114 unsigned max_receive;
1115 struct fw_iso_packet packet;
1116 unsigned long offset;
f2090594 1117 void **ptrptr;
c76acec6 1118 unsigned u;
c76acec6 1119
2fbd8dfe
YH
1120 if (dev->broadcast_state != FWNET_BROADCAST_ERROR)
1121 return 0;
1122
f91e3bd8
SR
1123 max_receive = 1U << (dev->card->max_receive + 1);
1124 num_packets = (FWNET_ISO_PAGE_COUNT * PAGE_SIZE) / max_receive;
1125
eac31d58
YH
1126 ptrptr = kmalloc(sizeof(void *) * num_packets, GFP_KERNEL);
1127 if (!ptrptr) {
1128 retval = -ENOMEM;
111534cd 1129 goto failed;
eac31d58
YH
1130 }
1131 dev->broadcast_rcv_buffer_ptrs = ptrptr;
1132
f2090594
YH
1133 context = fw_iso_context_create(dev->card, FW_ISO_CONTEXT_RECEIVE,
1134 IEEE1394_BROADCAST_CHANNEL,
1135 dev->card->link_speed, 8,
1136 fwnet_receive_broadcast, dev);
1137 if (IS_ERR(context)) {
1138 retval = PTR_ERR(context);
111534cd 1139 goto failed;
f2090594 1140 }
f91e3bd8 1141
f2090594
YH
1142 retval = fw_iso_buffer_init(&dev->broadcast_rcv_buffer, dev->card,
1143 FWNET_ISO_PAGE_COUNT, DMA_FROM_DEVICE);
1144 if (retval < 0)
111534cd
YH
1145 goto failed;
1146
1147 dev->broadcast_state = FWNET_BROADCAST_STOPPED;
f91e3bd8 1148
f2090594
YH
1149 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++) {
1150 void *ptr;
1151 unsigned v;
c76acec6 1152
f2090594
YH
1153 ptr = kmap(dev->broadcast_rcv_buffer.pages[u]);
1154 for (v = 0; v < num_packets / FWNET_ISO_PAGE_COUNT; v++)
1155 *ptrptr++ = (void *) ((char *)ptr + v * max_receive);
f91e3bd8 1156 }
f2090594 1157 dev->broadcast_rcv_context = context;
c76acec6
JF
1158
1159 packet.payload_length = max_receive;
1160 packet.interrupt = 1;
1161 packet.skip = 0;
1162 packet.tag = 3;
1163 packet.sy = 0;
f91e3bd8 1164 packet.header_length = IEEE1394_GASP_HDR_SIZE;
c76acec6 1165 offset = 0;
f91e3bd8
SR
1166
1167 for (u = 0; u < num_packets; u++) {
1168 retval = fw_iso_context_queue(context, &packet,
1169 &dev->broadcast_rcv_buffer, offset);
1170 if (retval < 0)
111534cd 1171 goto failed;
f91e3bd8 1172
c76acec6
JF
1173 offset += max_receive;
1174 }
f91e3bd8
SR
1175 dev->num_broadcast_rcv_ptrs = num_packets;
1176 dev->rcv_buffer_size = max_receive;
1177 dev->broadcast_rcv_next_ptr = 0U;
1178 retval = fw_iso_context_start(context, -1, 0,
1179 FW_ISO_CONTEXT_MATCH_ALL_TAGS); /* ??? sync */
1180 if (retval < 0)
111534cd 1181 goto failed;
f91e3bd8
SR
1182
1183 /* FIXME: adjust it according to the min. speed of all known peers? */
1184 dev->broadcast_xmt_max_payload = IEEE1394_MAX_PAYLOAD_S100
1185 - IEEE1394_GASP_HDR_SIZE - RFC2374_UNFRAG_HDR_SIZE;
1186 dev->broadcast_state = FWNET_BROADCAST_RUNNING;
1187
c76acec6
JF
1188 return 0;
1189
111534cd
YH
1190 failed:
1191 __fwnet_broadcast_stop(dev);
c76acec6
JF
1192 return retval;
1193}
1194
c1671470
SR
1195static void set_carrier_state(struct fwnet_device *dev)
1196{
1197 if (dev->peer_count > 1)
1198 netif_carrier_on(dev->netdev);
1199 else
1200 netif_carrier_off(dev->netdev);
1201}
1202
f91e3bd8
SR
1203/* ifup */
1204static int fwnet_open(struct net_device *net)
1205{
1206 struct fwnet_device *dev = netdev_priv(net);
c76acec6
JF
1207 int ret;
1208
2fbd8dfe
YH
1209 ret = fwnet_broadcast_start(dev);
1210 if (ret)
382c4b40 1211 return ret;
2fbd8dfe 1212
f91e3bd8
SR
1213 netif_start_queue(net);
1214
c1671470
SR
1215 spin_lock_irq(&dev->lock);
1216 set_carrier_state(dev);
1217 spin_unlock_irq(&dev->lock);
1218
c76acec6
JF
1219 return 0;
1220}
1221
f91e3bd8
SR
1222/* ifdown */
1223static int fwnet_stop(struct net_device *net)
c76acec6 1224{
8559e7f0
YH
1225 struct fwnet_device *dev = netdev_priv(net);
1226
f91e3bd8 1227 netif_stop_queue(net);
8559e7f0 1228 fwnet_broadcast_stop(dev);
c76acec6 1229
c76acec6
JF
1230 return 0;
1231}
1232
424efe9c 1233static netdev_tx_t fwnet_tx(struct sk_buff *skb, struct net_device *net)
c76acec6 1234{
f91e3bd8
SR
1235 struct fwnet_header hdr_buf;
1236 struct fwnet_device *dev = netdev_priv(net);
c76acec6
JF
1237 __be16 proto;
1238 u16 dest_node;
c76acec6
JF
1239 unsigned max_payload;
1240 u16 dg_size;
1241 u16 *datagram_label_ptr;
f91e3bd8 1242 struct fwnet_packet_task *ptask;
5a124d38
SR
1243 struct fwnet_peer *peer;
1244 unsigned long flags;
c76acec6 1245
b2268830
SR
1246 spin_lock_irqsave(&dev->lock, flags);
1247
1248 /* Can this happen? */
1249 if (netif_queue_stopped(dev->netdev)) {
1250 spin_unlock_irqrestore(&dev->lock, flags);
1251
1252 return NETDEV_TX_BUSY;
1253 }
1254
f91e3bd8 1255 ptask = kmem_cache_alloc(fwnet_packet_task_cache, GFP_ATOMIC);
c76acec6
JF
1256 if (ptask == NULL)
1257 goto fail;
1258
1259 skb = skb_share_check(skb, GFP_ATOMIC);
1260 if (!skb)
1261 goto fail;
1262
1263 /*
f91e3bd8 1264 * Make a copy of the driver-specific header.
c76acec6
JF
1265 * We might need to rebuild the header on tx failure.
1266 */
1267 memcpy(&hdr_buf, skb->data, sizeof(hdr_buf));
c76acec6 1268 proto = hdr_buf.h_proto;
18406d7e
YH
1269
1270 switch (proto) {
1271 case htons(ETH_P_ARP):
1272 case htons(ETH_P_IP):
cb6bf355
YH
1273#if IS_ENABLED(CONFIG_IPV6)
1274 case htons(ETH_P_IPV6):
1275#endif
18406d7e
YH
1276 break;
1277 default:
1278 goto fail;
1279 }
1280
1281 skb_pull(skb, sizeof(hdr_buf));
c76acec6
JF
1282 dg_size = skb->len;
1283
1284 /*
1285 * Set the transmission type for the packet. ARP packets and IP
1286 * broadcast packets are sent via GASP.
1287 */
021b97e4 1288 if (fwnet_hwaddr_is_multicast(hdr_buf.h_dest)) {
5a124d38 1289 max_payload = dev->broadcast_xmt_max_payload;
f91e3bd8
SR
1290 datagram_label_ptr = &dev->broadcast_xmt_datagramlabel;
1291
5a124d38
SR
1292 ptask->fifo_addr = FWNET_NO_FIFO_ADDR;
1293 ptask->generation = 0;
1294 ptask->dest_node = IEEE1394_ALL_NODES;
1295 ptask->speed = SCODE_100;
c76acec6 1296 } else {
6752c8db
YH
1297 union fwnet_hwaddr *ha = (union fwnet_hwaddr *)hdr_buf.h_dest;
1298 __be64 guid = get_unaligned(&ha->uc.uniq_id);
c76acec6
JF
1299 u8 generation;
1300
f91e3bd8 1301 peer = fwnet_peer_find_by_guid(dev, be64_to_cpu(guid));
6752c8db 1302 if (!peer)
b2268830 1303 goto fail;
c76acec6 1304
5a124d38
SR
1305 generation = peer->generation;
1306 dest_node = peer->node_id;
1307 max_payload = peer->max_payload;
f91e3bd8 1308 datagram_label_ptr = &peer->datagram_label;
c76acec6 1309
6752c8db 1310 ptask->fifo_addr = fwnet_hwaddr_fifo(ha);
5a124d38
SR
1311 ptask->generation = generation;
1312 ptask->dest_node = dest_node;
1313 ptask->speed = peer->speed;
c76acec6
JF
1314 }
1315
c76acec6
JF
1316 ptask->hdr.w0 = 0;
1317 ptask->hdr.w1 = 0;
1318 ptask->skb = skb;
f91e3bd8
SR
1319 ptask->dev = dev;
1320
c76acec6 1321 /* Does it all fit in one packet? */
f91e3bd8
SR
1322 if (dg_size <= max_payload) {
1323 fwnet_make_uf_hdr(&ptask->hdr, ntohs(proto));
c76acec6 1324 ptask->outstanding_pkts = 1;
f91e3bd8 1325 max_payload = dg_size + RFC2374_UNFRAG_HDR_SIZE;
c76acec6
JF
1326 } else {
1327 u16 datagram_label;
1328
f91e3bd8 1329 max_payload -= RFC2374_FRAG_OVERHEAD;
c76acec6 1330 datagram_label = (*datagram_label_ptr)++;
f91e3bd8
SR
1331 fwnet_make_ff_hdr(&ptask->hdr, ntohs(proto), dg_size,
1332 datagram_label);
c76acec6 1333 ptask->outstanding_pkts = DIV_ROUND_UP(dg_size, max_payload);
f91e3bd8 1334 max_payload += RFC2374_FRAG_HDR_SIZE;
c76acec6 1335 }
5a124d38 1336
b2268830
SR
1337 if (++dev->queued_datagrams == FWNET_MAX_QUEUED_DATAGRAMS)
1338 netif_stop_queue(dev->netdev);
48553011 1339
5a124d38
SR
1340 spin_unlock_irqrestore(&dev->lock, flags);
1341
c76acec6 1342 ptask->max_payload = max_payload;
48553011 1343 ptask->enqueued = 0;
110f82d7 1344
f91e3bd8
SR
1345 fwnet_send_packet(ptask);
1346
c76acec6
JF
1347 return NETDEV_TX_OK;
1348
1349 fail:
b2268830
SR
1350 spin_unlock_irqrestore(&dev->lock, flags);
1351
c76acec6 1352 if (ptask)
f91e3bd8 1353 kmem_cache_free(fwnet_packet_task_cache, ptask);
c76acec6
JF
1354
1355 if (skb != NULL)
1356 dev_kfree_skb(skb);
1357
f91e3bd8
SR
1358 net->stats.tx_dropped++;
1359 net->stats.tx_errors++;
c76acec6
JF
1360
1361 /*
1362 * FIXME: According to a patch from 2003-02-26, "returning non-zero
1363 * causes serious problems" here, allegedly. Before that patch,
1364 * -ERRNO was returned which is not appropriate under Linux 2.6.
1365 * Perhaps more needs to be done? Stop the queue in serious
1366 * conditions and restart it elsewhere?
1367 */
1368 return NETDEV_TX_OK;
1369}
1370
f91e3bd8
SR
1371static int fwnet_change_mtu(struct net_device *net, int new_mtu)
1372{
c76acec6
JF
1373 if (new_mtu < 68)
1374 return -EINVAL;
1375
f91e3bd8 1376 net->mtu = new_mtu;
c76acec6
JF
1377 return 0;
1378}
1379
18bb36f9
ML
1380static const struct ethtool_ops fwnet_ethtool_ops = {
1381 .get_link = ethtool_op_get_link,
1382};
1383
f91e3bd8
SR
1384static const struct net_device_ops fwnet_netdev_ops = {
1385 .ndo_open = fwnet_open,
1386 .ndo_stop = fwnet_stop,
1387 .ndo_start_xmit = fwnet_tx,
f91e3bd8 1388 .ndo_change_mtu = fwnet_change_mtu,
c76acec6
JF
1389};
1390
f91e3bd8
SR
1391static void fwnet_init_dev(struct net_device *net)
1392{
1393 net->header_ops = &fwnet_header_ops;
1394 net->netdev_ops = &fwnet_netdev_ops;
1337f853 1395 net->watchdog_timeo = 2 * HZ;
f91e3bd8
SR
1396 net->flags = IFF_BROADCAST | IFF_MULTICAST;
1397 net->features = NETIF_F_HIGHDMA;
1398 net->addr_len = FWNET_ALEN;
1399 net->hard_header_len = FWNET_HLEN;
1400 net->type = ARPHRD_IEEE1394;
b2268830 1401 net->tx_queue_len = FWNET_TX_QUEUE_LEN;
18bb36f9 1402 net->ethtool_ops = &fwnet_ethtool_ops;
c76acec6
JF
1403}
1404
5a124d38
SR
1405/* caller must hold fwnet_device_mutex */
1406static struct fwnet_device *fwnet_dev_find(struct fw_card *card)
1407{
1408 struct fwnet_device *dev;
1409
1410 list_for_each_entry(dev, &fwnet_device_list, dev_link)
1411 if (dev->card == card)
1412 return dev;
1413
1414 return NULL;
1415}
1416
1417static int fwnet_add_peer(struct fwnet_device *dev,
1418 struct fw_unit *unit, struct fw_device *device)
1419{
1420 struct fwnet_peer *peer;
1421
1422 peer = kmalloc(sizeof(*peer), GFP_KERNEL);
1423 if (!peer)
1424 return -ENOMEM;
1425
b01b4bab
SR
1426 dev_set_drvdata(&unit->device, peer);
1427
5a124d38
SR
1428 peer->dev = dev;
1429 peer->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4];
5a124d38
SR
1430 INIT_LIST_HEAD(&peer->pd_list);
1431 peer->pdg_size = 0;
1432 peer->datagram_label = 0;
1433 peer->speed = device->max_speed;
1434 peer->max_payload = fwnet_max_payload(device->max_rec, peer->speed);
1435
1436 peer->generation = device->generation;
1437 smp_rmb();
1438 peer->node_id = device->node_id;
1439
1440 spin_lock_irq(&dev->lock);
1441 list_add_tail(&peer->peer_link, &dev->peer_list);
18bb36f9 1442 dev->peer_count++;
c1671470 1443 set_carrier_state(dev);
5a124d38
SR
1444 spin_unlock_irq(&dev->lock);
1445
1446 return 0;
1447}
1448
94a87157
SR
1449static int fwnet_probe(struct fw_unit *unit,
1450 const struct ieee1394_device_id *id)
f91e3bd8 1451{
f91e3bd8
SR
1452 struct fw_device *device = fw_parent_device(unit);
1453 struct fw_card *card = device->card;
1454 struct net_device *net;
b01b4bab 1455 bool allocated_netdev = false;
f91e3bd8 1456 struct fwnet_device *dev;
c76acec6 1457 unsigned max_mtu;
5a124d38 1458 int ret;
6752c8db 1459 union fwnet_hwaddr *ha;
c76acec6 1460
5a124d38 1461 mutex_lock(&fwnet_device_mutex);
c76acec6 1462
5a124d38
SR
1463 dev = fwnet_dev_find(card);
1464 if (dev) {
5a124d38
SR
1465 net = dev->netdev;
1466 goto have_dev;
c76acec6 1467 }
5a124d38 1468
c835a677
TG
1469 net = alloc_netdev(sizeof(*dev), "firewire%d", NET_NAME_UNKNOWN,
1470 fwnet_init_dev);
f91e3bd8 1471 if (net == NULL) {
1118f8d0
DY
1472 mutex_unlock(&fwnet_device_mutex);
1473 return -ENOMEM;
c76acec6
JF
1474 }
1475
b01b4bab 1476 allocated_netdev = true;
f91e3bd8
SR
1477 SET_NETDEV_DEV(net, card->device);
1478 dev = netdev_priv(net);
c76acec6 1479
f91e3bd8
SR
1480 spin_lock_init(&dev->lock);
1481 dev->broadcast_state = FWNET_BROADCAST_ERROR;
1482 dev->broadcast_rcv_context = NULL;
1483 dev->broadcast_xmt_max_payload = 0;
1484 dev->broadcast_xmt_datagramlabel = 0;
f91e3bd8 1485 dev->local_fifo = FWNET_NO_FIFO_ADDR;
48553011 1486 dev->queued_datagrams = 0;
5a124d38 1487 INIT_LIST_HEAD(&dev->peer_list);
f91e3bd8 1488 dev->card = card;
5a124d38 1489 dev->netdev = net;
c76acec6 1490
382c4b40
YH
1491 ret = fwnet_fifo_start(dev);
1492 if (ret < 0)
1493 goto out;
1494 dev->local_fifo = dev->handler.offset;
1495
c76acec6
JF
1496 /*
1497 * Use the RFC 2734 default 1500 octets or the maximum payload
1498 * as initial MTU
1499 */
1500 max_mtu = (1 << (card->max_receive + 1))
f91e3bd8
SR
1501 - sizeof(struct rfc2734_header) - IEEE1394_GASP_HDR_SIZE;
1502 net->mtu = min(1500U, max_mtu);
c76acec6
JF
1503
1504 /* Set our hardware address while we're at it */
6752c8db
YH
1505 ha = (union fwnet_hwaddr *)net->dev_addr;
1506 put_unaligned_be64(card->guid, &ha->uc.uniq_id);
1507 ha->uc.max_rec = dev->card->max_receive;
1508 ha->uc.sspd = dev->card->link_speed;
1509 put_unaligned_be16(dev->local_fifo >> 32, &ha->uc.fifo_hi);
1510 put_unaligned_be32(dev->local_fifo & 0xffffffff, &ha->uc.fifo_lo);
1511
1512 memset(net->broadcast, -1, net->addr_len);
1513
5a124d38 1514 ret = register_netdev(net);
8408dc1c 1515 if (ret)
c76acec6 1516 goto out;
c76acec6 1517
5a124d38 1518 list_add_tail(&dev->dev_link, &fwnet_device_list);
cb6bf355 1519 dev_notice(&net->dev, "IP over IEEE 1394 on card %s\n",
8408dc1c 1520 dev_name(card->device));
5a124d38
SR
1521 have_dev:
1522 ret = fwnet_add_peer(dev, unit, device);
b01b4bab 1523 if (ret && allocated_netdev) {
5a124d38
SR
1524 unregister_netdev(net);
1525 list_del(&dev->dev_link);
c76acec6 1526 out:
382c4b40 1527 fwnet_fifo_stop(dev);
f91e3bd8 1528 free_netdev(net);
382c4b40 1529 }
f91e3bd8 1530
5a124d38
SR
1531 mutex_unlock(&fwnet_device_mutex);
1532
1533 return ret;
1534}
1535
94a87157
SR
1536/*
1537 * FIXME abort partially sent fragmented datagrams,
1538 * discard partially received fragmented datagrams
1539 */
1540static void fwnet_update(struct fw_unit *unit)
1541{
1542 struct fw_device *device = fw_parent_device(unit);
1543 struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1544 int generation;
1545
1546 generation = device->generation;
1547
1548 spin_lock_irq(&peer->dev->lock);
1549 peer->node_id = device->node_id;
1550 peer->generation = generation;
1551 spin_unlock_irq(&peer->dev->lock);
1552}
1553
c1671470 1554static void fwnet_remove_peer(struct fwnet_peer *peer, struct fwnet_device *dev)
5a124d38
SR
1555{
1556 struct fwnet_partial_datagram *pd, *pd_next;
1557
c1671470 1558 spin_lock_irq(&dev->lock);
5a124d38 1559 list_del(&peer->peer_link);
c1671470
SR
1560 dev->peer_count--;
1561 set_carrier_state(dev);
1562 spin_unlock_irq(&dev->lock);
5a124d38
SR
1563
1564 list_for_each_entry_safe(pd, pd_next, &peer->pd_list, pd_link)
1565 fwnet_pd_delete(pd);
1566
1567 kfree(peer);
c76acec6
JF
1568}
1569
94a87157 1570static void fwnet_remove(struct fw_unit *unit)
f91e3bd8 1571{
94a87157 1572 struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
5a124d38 1573 struct fwnet_device *dev = peer->dev;
f91e3bd8 1574 struct net_device *net;
48553011 1575 int i;
f91e3bd8 1576
5a124d38 1577 mutex_lock(&fwnet_device_mutex);
c76acec6 1578
74a14504 1579 net = dev->netdev;
74a14504 1580
c1671470 1581 fwnet_remove_peer(peer, dev);
18bb36f9 1582
5a124d38 1583 if (list_empty(&dev->peer_list)) {
f91e3bd8
SR
1584 unregister_netdev(net);
1585
382c4b40
YH
1586 fwnet_fifo_stop(dev);
1587
48553011
SR
1588 for (i = 0; dev->queued_datagrams && i < 5; i++)
1589 ssleep(1);
1590 WARN_ON(dev->queued_datagrams);
b01b4bab
SR
1591 list_del(&dev->dev_link);
1592
f91e3bd8 1593 free_netdev(net);
c76acec6 1594 }
f91e3bd8 1595
5a124d38 1596 mutex_unlock(&fwnet_device_mutex);
c76acec6
JF
1597}
1598
f91e3bd8
SR
1599static const struct ieee1394_device_id fwnet_id_table[] = {
1600 {
1601 .match_flags = IEEE1394_MATCH_SPECIFIER_ID |
1602 IEEE1394_MATCH_VERSION,
1603 .specifier_id = IANA_SPECIFIER_ID,
1604 .version = RFC2734_SW_VERSION,
1605 },
cb6bf355
YH
1606#if IS_ENABLED(CONFIG_IPV6)
1607 {
1608 .match_flags = IEEE1394_MATCH_SPECIFIER_ID |
1609 IEEE1394_MATCH_VERSION,
1610 .specifier_id = IANA_SPECIFIER_ID,
1611 .version = RFC3146_SW_VERSION,
1612 },
1613#endif
f91e3bd8
SR
1614 { }
1615};
1616
1617static struct fw_driver fwnet_driver = {
c76acec6 1618 .driver = {
f91e3bd8 1619 .owner = THIS_MODULE,
59759ff6 1620 .name = KBUILD_MODNAME,
f91e3bd8 1621 .bus = &fw_bus_type,
c76acec6 1622 },
94a87157 1623 .probe = fwnet_probe,
f91e3bd8 1624 .update = fwnet_update,
94a87157 1625 .remove = fwnet_remove,
f91e3bd8
SR
1626 .id_table = fwnet_id_table,
1627};
1628
1629static const u32 rfc2374_unit_directory_data[] = {
1630 0x00040000, /* directory_length */
1631 0x1200005e, /* unit_specifier_id: IANA */
1632 0x81000003, /* textual descriptor offset */
1633 0x13000001, /* unit_sw_version: RFC 2734 */
1634 0x81000005, /* textual descriptor offset */
1635 0x00030000, /* descriptor_length */
1636 0x00000000, /* text */
1637 0x00000000, /* minimal ASCII, en */
1638 0x49414e41, /* I A N A */
1639 0x00030000, /* descriptor_length */
1640 0x00000000, /* text */
1641 0x00000000, /* minimal ASCII, en */
1642 0x49507634, /* I P v 4 */
1643};
1644
1645static struct fw_descriptor rfc2374_unit_directory = {
1646 .length = ARRAY_SIZE(rfc2374_unit_directory_data),
1647 .key = (CSR_DIRECTORY | CSR_UNIT) << 24,
1648 .data = rfc2374_unit_directory_data
c76acec6
JF
1649};
1650
cb6bf355
YH
1651#if IS_ENABLED(CONFIG_IPV6)
1652static const u32 rfc3146_unit_directory_data[] = {
1653 0x00040000, /* directory_length */
1654 0x1200005e, /* unit_specifier_id: IANA */
1655 0x81000003, /* textual descriptor offset */
1656 0x13000002, /* unit_sw_version: RFC 3146 */
1657 0x81000005, /* textual descriptor offset */
1658 0x00030000, /* descriptor_length */
1659 0x00000000, /* text */
1660 0x00000000, /* minimal ASCII, en */
1661 0x49414e41, /* I A N A */
1662 0x00030000, /* descriptor_length */
1663 0x00000000, /* text */
1664 0x00000000, /* minimal ASCII, en */
1665 0x49507636, /* I P v 6 */
1666};
1667
1668static struct fw_descriptor rfc3146_unit_directory = {
1669 .length = ARRAY_SIZE(rfc3146_unit_directory_data),
1670 .key = (CSR_DIRECTORY | CSR_UNIT) << 24,
1671 .data = rfc3146_unit_directory_data
1672};
1673#endif
1674
f91e3bd8
SR
1675static int __init fwnet_init(void)
1676{
1677 int err;
1678
1679 err = fw_core_add_descriptor(&rfc2374_unit_directory);
1680 if (err)
1681 return err;
c76acec6 1682
cb6bf355
YH
1683#if IS_ENABLED(CONFIG_IPV6)
1684 err = fw_core_add_descriptor(&rfc3146_unit_directory);
1685 if (err)
1686 goto out;
1687#endif
1688
f91e3bd8
SR
1689 fwnet_packet_task_cache = kmem_cache_create("packet_task",
1690 sizeof(struct fwnet_packet_task), 0, 0, NULL);
1691 if (!fwnet_packet_task_cache) {
1692 err = -ENOMEM;
cb6bf355 1693 goto out2;
f91e3bd8
SR
1694 }
1695
1696 err = driver_register(&fwnet_driver.driver);
1697 if (!err)
1698 return 0;
1699
1700 kmem_cache_destroy(fwnet_packet_task_cache);
cb6bf355
YH
1701out2:
1702#if IS_ENABLED(CONFIG_IPV6)
1703 fw_core_remove_descriptor(&rfc3146_unit_directory);
f91e3bd8 1704out:
cb6bf355 1705#endif
f91e3bd8
SR
1706 fw_core_remove_descriptor(&rfc2374_unit_directory);
1707
1708 return err;
c76acec6 1709}
f91e3bd8 1710module_init(fwnet_init);
c76acec6 1711
f91e3bd8
SR
1712static void __exit fwnet_cleanup(void)
1713{
1714 driver_unregister(&fwnet_driver.driver);
1715 kmem_cache_destroy(fwnet_packet_task_cache);
cb6bf355
YH
1716#if IS_ENABLED(CONFIG_IPV6)
1717 fw_core_remove_descriptor(&rfc3146_unit_directory);
1718#endif
f91e3bd8 1719 fw_core_remove_descriptor(&rfc2374_unit_directory);
c76acec6 1720}
f91e3bd8 1721module_exit(fwnet_cleanup);
c76acec6 1722
f91e3bd8 1723MODULE_AUTHOR("Jay Fenlason <fenlason@redhat.com>");
cb6bf355 1724MODULE_DESCRIPTION("IP over IEEE1394 as per RFC 2734/3146");
f91e3bd8
SR
1725MODULE_LICENSE("GPL");
1726MODULE_DEVICE_TABLE(ieee1394, fwnet_id_table);