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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / firewire / net.c
blob715e491dfbc333395aa5ba5f3861e7d65b10368c
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 <fenlason@redhat.com>
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/mod_devicetable.h>
23 #include <linux/module.h>
24 #include <linux/moduleparam.h>
25 #include <linux/mutex.h>
26 #include <linux/netdevice.h>
27 #include <linux/skbuff.h>
28 #include <linux/slab.h>
29 #include <linux/spinlock.h>
30
31 #include <asm/unaligned.h>
32 #include <net/arp.h>
33 #include <net/firewire.h>
34
35 /* rx limits */
36 #define FWNET_MAX_FRAGMENTS 30 /* arbitrary, > TX queue depth */
37 #define FWNET_ISO_PAGE_COUNT (PAGE_SIZE < 16*1024 ? 4 : 2)
38
39 /* tx limits */
40 #define FWNET_MAX_QUEUED_DATAGRAMS 20 /* < 64 = number of tlabels */
41 #define FWNET_MIN_QUEUED_DATAGRAMS 10 /* should keep AT DMA busy enough */
42 #define FWNET_TX_QUEUE_LEN FWNET_MAX_QUEUED_DATAGRAMS /* ? */
43
44 #define IEEE1394_BROADCAST_CHANNEL 31
45 #define IEEE1394_ALL_NODES (0xffc0 | 0x003f)
46 #define IEEE1394_MAX_PAYLOAD_S100 512
47 #define FWNET_NO_FIFO_ADDR (~0ULL)
48
49 #define IANA_SPECIFIER_ID 0x00005eU
50 #define RFC2734_SW_VERSION 0x000001U
51 #define RFC3146_SW_VERSION 0x000002U
52
53 #define IEEE1394_GASP_HDR_SIZE 8
54
55 #define RFC2374_UNFRAG_HDR_SIZE 4
56 #define RFC2374_FRAG_HDR_SIZE 8
57 #define RFC2374_FRAG_OVERHEAD 4
58
59 #define RFC2374_HDR_UNFRAG 0 /* unfragmented */
60 #define RFC2374_HDR_FIRSTFRAG 1 /* first fragment */
61 #define RFC2374_HDR_LASTFRAG 2 /* last fragment */
62 #define RFC2374_HDR_INTFRAG 3 /* interior fragment */
63
64 static bool fwnet_hwaddr_is_multicast(u8 *ha)
65 {
66 return !!(*ha & 1);
67 }
68
69 /* IPv4 and IPv6 encapsulation header */
70 struct rfc2734_header {
71 u32 w0;
72 u32 w1;
73 };
74
75 #define fwnet_get_hdr_lf(h) (((h)->w0 & 0xc0000000) >> 30)
76 #define fwnet_get_hdr_ether_type(h) (((h)->w0 & 0x0000ffff))
77 #define fwnet_get_hdr_dg_size(h) ((((h)->w0 & 0x0fff0000) >> 16) + 1)
78 #define fwnet_get_hdr_fg_off(h) (((h)->w0 & 0x00000fff))
79 #define fwnet_get_hdr_dgl(h) (((h)->w1 & 0xffff0000) >> 16)
80
81 #define fwnet_set_hdr_lf(lf) ((lf) << 30)
82 #define fwnet_set_hdr_ether_type(et) (et)
83 #define fwnet_set_hdr_dg_size(dgs) (((dgs) - 1) << 16)
84 #define fwnet_set_hdr_fg_off(fgo) (fgo)
85
86 #define fwnet_set_hdr_dgl(dgl) ((dgl) << 16)
87
88 static inline void fwnet_make_uf_hdr(struct rfc2734_header *hdr,
89 unsigned ether_type)
90 {
91 hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_UNFRAG)
92 | fwnet_set_hdr_ether_type(ether_type);
93 }
94
95 static inline void fwnet_make_ff_hdr(struct rfc2734_header *hdr,
96 unsigned ether_type, unsigned dg_size, unsigned dgl)
97 {
98 hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_FIRSTFRAG)
99 | fwnet_set_hdr_dg_size(dg_size)
100 | fwnet_set_hdr_ether_type(ether_type);
101 hdr->w1 = fwnet_set_hdr_dgl(dgl);
102 }
103
104 static inline void fwnet_make_sf_hdr(struct rfc2734_header *hdr,
105 unsigned lf, unsigned dg_size, unsigned fg_off, unsigned dgl)
106 {
107 hdr->w0 = fwnet_set_hdr_lf(lf)
108 | fwnet_set_hdr_dg_size(dg_size)
109 | fwnet_set_hdr_fg_off(fg_off);
110 hdr->w1 = fwnet_set_hdr_dgl(dgl);
111 }
112
113 /* This list keeps track of what parts of the datagram have been filled in */
114 struct fwnet_fragment_info {
115 struct list_head fi_link;
116 u16 offset;
117 u16 len;
118 };
119
120 struct fwnet_partial_datagram {
121 struct list_head pd_link;
122 struct list_head fi_list;
123 struct sk_buff *skb;
124 /* FIXME Why not use skb->data? */
125 char *pbuf;
126 u16 datagram_label;
127 u16 ether_type;
128 u16 datagram_size;
129 };
130
131 static DEFINE_MUTEX(fwnet_device_mutex);
132 static LIST_HEAD(fwnet_device_list);
133
134 struct fwnet_device {
135 struct list_head dev_link;
136 spinlock_t lock;
137 enum {
138 FWNET_BROADCAST_ERROR,
139 FWNET_BROADCAST_RUNNING,
140 FWNET_BROADCAST_STOPPED,
141 } broadcast_state;
142 struct fw_iso_context *broadcast_rcv_context;
143 struct fw_iso_buffer broadcast_rcv_buffer;
144 void **broadcast_rcv_buffer_ptrs;
145 unsigned broadcast_rcv_next_ptr;
146 unsigned num_broadcast_rcv_ptrs;
147 unsigned rcv_buffer_size;
148 /*
149 * This value is the maximum unfragmented datagram size that can be
150 * sent by the hardware. It already has the GASP overhead and the
151 * unfragmented datagram header overhead calculated into it.
152 */
153 unsigned broadcast_xmt_max_payload;
154 u16 broadcast_xmt_datagramlabel;
155
156 /*
157 * The CSR address that remote nodes must send datagrams to for us to
158 * receive them.
159 */
160 struct fw_address_handler handler;
161 u64 local_fifo;
162
163 /* Number of tx datagrams that have been queued but not yet acked */
164 int queued_datagrams;
165
166 int peer_count;
167 struct list_head peer_list;
168 struct fw_card *card;
169 struct net_device *netdev;
170 };
171
172 struct fwnet_peer {
173 struct list_head peer_link;
174 struct fwnet_device *dev;
175 u64 guid;
176
177 /* guarded by dev->lock */
178 struct list_head pd_list; /* received partial datagrams */
179 unsigned pdg_size; /* pd_list size */
180
181 u16 datagram_label; /* outgoing datagram label */
182 u16 max_payload; /* includes RFC2374_FRAG_HDR_SIZE overhead */
183 int node_id;
184 int generation;
185 unsigned speed;
186 };
187
188 /* This is our task struct. It's used for the packet complete callback. */
189 struct fwnet_packet_task {
190 struct fw_transaction transaction;
191 struct rfc2734_header hdr;
192 struct sk_buff *skb;
193 struct fwnet_device *dev;
194
195 int outstanding_pkts;
196 u64 fifo_addr;
197 u16 dest_node;
198 u16 max_payload;
199 u8 generation;
200 u8 speed;
201 u8 enqueued;
202 };
203
204 /*
205 * Get fifo address embedded in hwaddr
206 */
207 static __u64 fwnet_hwaddr_fifo(union fwnet_hwaddr *ha)
208 {
209 return (u64)get_unaligned_be16(&ha->uc.fifo_hi) << 32
210 | get_unaligned_be32(&ha->uc.fifo_lo);
211 }
212
213 /*
214 * saddr == NULL means use device source address.
215 * daddr == NULL means leave destination address (eg unresolved arp).
216 */
217 static int fwnet_header_create(struct sk_buff *skb, struct net_device *net,
218 unsigned short type, const void *daddr,
219 const void *saddr, unsigned len)
220 {
221 struct fwnet_header *h;
222
223 h = skb_push(skb, sizeof(*h));
224 put_unaligned_be16(type, &h->h_proto);
225
226 if (net->flags & (IFF_LOOPBACK | IFF_NOARP)) {
227 memset(h->h_dest, 0, net->addr_len);
228
229 return net->hard_header_len;
230 }
231
232 if (daddr) {
233 memcpy(h->h_dest, daddr, net->addr_len);
234
235 return net->hard_header_len;
236 }
237
238 return -net->hard_header_len;
239 }
240
241 static int fwnet_header_cache(const struct neighbour *neigh,
242 struct hh_cache *hh, __be16 type)
243 {
244 struct net_device *net;
245 struct fwnet_header *h;
246
247 if (type == cpu_to_be16(ETH_P_802_3))
248 return -1;
249 net = neigh->dev;
250 h = (struct fwnet_header *)((u8 *)hh->hh_data + HH_DATA_OFF(sizeof(*h)));
251 h->h_proto = type;
252 memcpy(h->h_dest, neigh->ha, net->addr_len);
253
254 /* Pairs with the READ_ONCE() in neigh_resolve_output(),
255 * neigh_hh_output() and neigh_update_hhs().
256 */
257 smp_store_release(&hh->hh_len, FWNET_HLEN);
258
259 return 0;
260 }
261
262 /* Called by Address Resolution module to notify changes in address. */
263 static void fwnet_header_cache_update(struct hh_cache *hh,
264 const struct net_device *net, const unsigned char *haddr)
265 {
266 memcpy((u8 *)hh->hh_data + HH_DATA_OFF(FWNET_HLEN), haddr, net->addr_len);
267 }
268
269 static int fwnet_header_parse(const struct sk_buff *skb, unsigned char *haddr)
270 {
271 memcpy(haddr, skb->dev->dev_addr, FWNET_ALEN);
272
273 return FWNET_ALEN;
274 }
275
276 static const struct header_ops fwnet_header_ops = {
277 .create = fwnet_header_create,
278 .cache = fwnet_header_cache,
279 .cache_update = fwnet_header_cache_update,
280 .parse = fwnet_header_parse,
281 };
282
283 /* FIXME: is this correct for all cases? */
284 static bool fwnet_frag_overlap(struct fwnet_partial_datagram *pd,
285 unsigned offset, unsigned len)
286 {
287 struct fwnet_fragment_info *fi;
288 unsigned end = offset + len;
289
290 list_for_each_entry(fi, &pd->fi_list, fi_link)
291 if (offset < fi->offset + fi->len && end > fi->offset)
292 return true;
293
294 return false;
295 }
296
297 /* Assumes that new fragment does not overlap any existing fragments */
298 static struct fwnet_fragment_info *fwnet_frag_new(
299 struct fwnet_partial_datagram *pd, unsigned offset, unsigned len)
300 {
301 struct fwnet_fragment_info *fi, *fi2, *new;
302 struct list_head *list;
303
304 list = &pd->fi_list;
305 list_for_each_entry(fi, &pd->fi_list, fi_link) {
306 if (fi->offset + fi->len == offset) {
307 /* The new fragment can be tacked on to the end */
308 /* Did the new fragment plug a hole? */
309 fi2 = list_entry(fi->fi_link.next,
310 struct fwnet_fragment_info, fi_link);
311 if (fi->offset + fi->len == fi2->offset) {
312 /* glue fragments together */
313 fi->len += len + fi2->len;
314 list_del(&fi2->fi_link);
315 kfree(fi2);
316 } else {
317 fi->len += len;
318 }
319
320 return fi;
321 }
322 if (offset + len == fi->offset) {
323 /* The new fragment can be tacked on to the beginning */
324 /* Did the new fragment plug a hole? */
325 fi2 = list_entry(fi->fi_link.prev,
326 struct fwnet_fragment_info, fi_link);
327 if (fi2->offset + fi2->len == fi->offset) {
328 /* glue fragments together */
329 fi2->len += fi->len + len;
330 list_del(&fi->fi_link);
331 kfree(fi);
332
333 return fi2;
334 }
335 fi->offset = offset;
336 fi->len += len;
337
338 return fi;
339 }
340 if (offset > fi->offset + fi->len) {
341 list = &fi->fi_link;
342 break;
343 }
344 if (offset + len < fi->offset) {
345 list = fi->fi_link.prev;
346 break;
347 }
348 }
349
350 new = kmalloc(sizeof(*new), GFP_ATOMIC);
351 if (!new)
352 return NULL;
353
354 new->offset = offset;
355 new->len = len;
356 list_add(&new->fi_link, list);
357
358 return new;
359 }
360
361 static struct fwnet_partial_datagram *fwnet_pd_new(struct net_device *net,
362 struct fwnet_peer *peer, u16 datagram_label, unsigned dg_size,
363 void *frag_buf, unsigned frag_off, unsigned frag_len)
364 {
365 struct fwnet_partial_datagram *new;
366 struct fwnet_fragment_info *fi;
367
368 new = kmalloc(sizeof(*new), GFP_ATOMIC);
369 if (!new)
370 goto fail;
371
372 INIT_LIST_HEAD(&new->fi_list);
373 fi = fwnet_frag_new(new, frag_off, frag_len);
374 if (fi == NULL)
375 goto fail_w_new;
376
377 new->datagram_label = datagram_label;
378 new->datagram_size = dg_size;
379 new->skb = dev_alloc_skb(dg_size + LL_RESERVED_SPACE(net));
380 if (new->skb == NULL)
381 goto fail_w_fi;
382
383 skb_reserve(new->skb, LL_RESERVED_SPACE(net));
384 new->pbuf = skb_put(new->skb, dg_size);
385 memcpy(new->pbuf + frag_off, frag_buf, frag_len);
386 list_add_tail(&new->pd_link, &peer->pd_list);
387
388 return new;
389
390 fail_w_fi:
391 kfree(fi);
392 fail_w_new:
393 kfree(new);
394 fail:
395 return NULL;
396 }
397
398 static struct fwnet_partial_datagram *fwnet_pd_find(struct fwnet_peer *peer,
399 u16 datagram_label)
400 {
401 struct fwnet_partial_datagram *pd;
402
403 list_for_each_entry(pd, &peer->pd_list, pd_link)
404 if (pd->datagram_label == datagram_label)
405 return pd;
406
407 return NULL;
408 }
409
410
411 static void fwnet_pd_delete(struct fwnet_partial_datagram *old)
412 {
413 struct fwnet_fragment_info *fi, *n;
414
415 list_for_each_entry_safe(fi, n, &old->fi_list, fi_link)
416 kfree(fi);
417
418 list_del(&old->pd_link);
419 dev_kfree_skb_any(old->skb);
420 kfree(old);
421 }
422
423 static bool fwnet_pd_update(struct fwnet_peer *peer,
424 struct fwnet_partial_datagram *pd, void *frag_buf,
425 unsigned frag_off, unsigned frag_len)
426 {
427 if (fwnet_frag_new(pd, frag_off, frag_len) == NULL)
428 return false;
429
430 memcpy(pd->pbuf + frag_off, frag_buf, frag_len);
431
432 /*
433 * Move list entry to beginning of list so that oldest partial
434 * datagrams percolate to the end of the list
435 */
436 list_move_tail(&pd->pd_link, &peer->pd_list);
437
438 return true;
439 }
440
441 static bool fwnet_pd_is_complete(struct fwnet_partial_datagram *pd)
442 {
443 struct fwnet_fragment_info *fi;
444
445 fi = list_entry(pd->fi_list.next, struct fwnet_fragment_info, fi_link);
446
447 return fi->len == pd->datagram_size;
448 }
449
450 /* caller must hold dev->lock */
451 static struct fwnet_peer *fwnet_peer_find_by_guid(struct fwnet_device *dev,
452 u64 guid)
453 {
454 struct fwnet_peer *peer;
455
456 list_for_each_entry(peer, &dev->peer_list, peer_link)
457 if (peer->guid == guid)
458 return peer;
459
460 return NULL;
461 }
462
463 /* caller must hold dev->lock */
464 static struct fwnet_peer *fwnet_peer_find_by_node_id(struct fwnet_device *dev,
465 int node_id, int generation)
466 {
467 struct fwnet_peer *peer;
468
469 list_for_each_entry(peer, &dev->peer_list, peer_link)
470 if (peer->node_id == node_id &&
471 peer->generation == generation)
472 return peer;
473
474 return NULL;
475 }
476
477 /* See IEEE 1394-2008 table 6-4, table 8-8, table 16-18. */
478 static unsigned fwnet_max_payload(unsigned max_rec, unsigned speed)
479 {
480 max_rec = min(max_rec, speed + 8);
481 max_rec = clamp(max_rec, 8U, 11U); /* 512...4096 */
482
483 return (1 << (max_rec + 1)) - RFC2374_FRAG_HDR_SIZE;
484 }
485
486
487 static int fwnet_finish_incoming_packet(struct net_device *net,
488 struct sk_buff *skb, u16 source_node_id,
489 bool is_broadcast, u16 ether_type)
490 {
491 struct fwnet_device *dev;
492 int status;
493 __be64 guid;
494
495 switch (ether_type) {
496 case ETH_P_ARP:
497 case ETH_P_IP:
498 #if IS_ENABLED(CONFIG_IPV6)
499 case ETH_P_IPV6:
500 #endif
501 break;
502 default:
503 goto err;
504 }
505
506 dev = netdev_priv(net);
507 /* Write metadata, and then pass to the receive level */
508 skb->dev = net;
509 skb->ip_summed = CHECKSUM_NONE;
510
511 /*
512 * Parse the encapsulation header. This actually does the job of
513 * converting to an ethernet-like pseudo frame header.
514 */
515 guid = cpu_to_be64(dev->card->guid);
516 if (dev_hard_header(skb, net, ether_type,
517 is_broadcast ? net->broadcast : net->dev_addr,
518 NULL, skb->len) >= 0) {
519 struct fwnet_header *eth;
520 u16 *rawp;
521 __be16 protocol;
522
523 skb_reset_mac_header(skb);
524 skb_pull(skb, sizeof(*eth));
525 eth = (struct fwnet_header *)skb_mac_header(skb);
526 if (fwnet_hwaddr_is_multicast(eth->h_dest)) {
527 if (memcmp(eth->h_dest, net->broadcast,
528 net->addr_len) == 0)
529 skb->pkt_type = PACKET_BROADCAST;
530 #if 0
531 else
532 skb->pkt_type = PACKET_MULTICAST;
533 #endif
534 } else {
535 if (memcmp(eth->h_dest, net->dev_addr, net->addr_len))
536 skb->pkt_type = PACKET_OTHERHOST;
537 }
538 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN) {
539 protocol = eth->h_proto;
540 } else {
541 rawp = (u16 *)skb->data;
542 if (*rawp == 0xffff)
543 protocol = htons(ETH_P_802_3);
544 else
545 protocol = htons(ETH_P_802_2);
546 }
547 skb->protocol = protocol;
548 }
549 status = netif_rx(skb);
550 if (status == NET_RX_DROP) {
551 net->stats.rx_errors++;
552 net->stats.rx_dropped++;
553 } else {
554 net->stats.rx_packets++;
555 net->stats.rx_bytes += skb->len;
556 }
557
558 return 0;
559
560 err:
561 net->stats.rx_errors++;
562 net->stats.rx_dropped++;
563
564 dev_kfree_skb_any(skb);
565
566 return -ENOENT;
567 }
568
569 static int fwnet_incoming_packet(struct fwnet_device *dev, __be32 *buf, int len,
570 int source_node_id, int generation,
571 bool is_broadcast)
572 {
573 struct sk_buff *skb;
574 struct net_device *net = dev->netdev;
575 struct rfc2734_header hdr;
576 unsigned lf;
577 unsigned long flags;
578 struct fwnet_peer *peer;
579 struct fwnet_partial_datagram *pd;
580 int fg_off;
581 int dg_size;
582 u16 datagram_label;
583 int retval;
584 u16 ether_type;
585
586 if (len <= RFC2374_UNFRAG_HDR_SIZE)
587 return 0;
588
589 hdr.w0 = be32_to_cpu(buf[0]);
590 lf = fwnet_get_hdr_lf(&hdr);
591 if (lf == RFC2374_HDR_UNFRAG) {
592 /*
593 * An unfragmented datagram has been received by the ieee1394
594 * bus. Build an skbuff around it so we can pass it to the
595 * high level network layer.
596 */
597 ether_type = fwnet_get_hdr_ether_type(&hdr);
598 buf++;
599 len -= RFC2374_UNFRAG_HDR_SIZE;
600
601 skb = dev_alloc_skb(len + LL_RESERVED_SPACE(net));
602 if (unlikely(!skb)) {
603 net->stats.rx_dropped++;
604
605 return -ENOMEM;
606 }
607 skb_reserve(skb, LL_RESERVED_SPACE(net));
608 skb_put_data(skb, buf, len);
609
610 return fwnet_finish_incoming_packet(net, skb, source_node_id,
611 is_broadcast, ether_type);
612 }
613
614 /* A datagram fragment has been received, now the fun begins. */
615
616 if (len <= RFC2374_FRAG_HDR_SIZE)
617 return 0;
618
619 hdr.w1 = ntohl(buf[1]);
620 buf += 2;
621 len -= RFC2374_FRAG_HDR_SIZE;
622 if (lf == RFC2374_HDR_FIRSTFRAG) {
623 ether_type = fwnet_get_hdr_ether_type(&hdr);
624 fg_off = 0;
625 } else {
626 ether_type = 0;
627 fg_off = fwnet_get_hdr_fg_off(&hdr);
628 }
629 datagram_label = fwnet_get_hdr_dgl(&hdr);
630 dg_size = fwnet_get_hdr_dg_size(&hdr);
631
632 if (fg_off + len > dg_size)
633 return 0;
634
635 spin_lock_irqsave(&dev->lock, flags);
636
637 peer = fwnet_peer_find_by_node_id(dev, source_node_id, generation);
638 if (!peer) {
639 retval = -ENOENT;
640 goto fail;
641 }
642
643 pd = fwnet_pd_find(peer, datagram_label);
644 if (pd == NULL) {
645 while (peer->pdg_size >= FWNET_MAX_FRAGMENTS) {
646 /* remove the oldest */
647 fwnet_pd_delete(list_first_entry(&peer->pd_list,
648 struct fwnet_partial_datagram, pd_link));
649 peer->pdg_size--;
650 }
651 pd = fwnet_pd_new(net, peer, datagram_label,
652 dg_size, buf, fg_off, len);
653 if (pd == NULL) {
654 retval = -ENOMEM;
655 goto fail;
656 }
657 peer->pdg_size++;
658 } else {
659 if (fwnet_frag_overlap(pd, fg_off, len) ||
660 pd->datagram_size != dg_size) {
661 /*
662 * Differing datagram sizes or overlapping fragments,
663 * discard old datagram and start a new one.
664 */
665 fwnet_pd_delete(pd);
666 pd = fwnet_pd_new(net, peer, datagram_label,
667 dg_size, buf, fg_off, len);
668 if (pd == NULL) {
669 peer->pdg_size--;
670 retval = -ENOMEM;
671 goto fail;
672 }
673 } else {
674 if (!fwnet_pd_update(peer, pd, buf, fg_off, len)) {
675 /*
676 * Couldn't save off fragment anyway
677 * so might as well obliterate the
678 * datagram now.
679 */
680 fwnet_pd_delete(pd);
681 peer->pdg_size--;
682 retval = -ENOMEM;
683 goto fail;
684 }
685 }
686 } /* new datagram or add to existing one */
687
688 if (lf == RFC2374_HDR_FIRSTFRAG)
689 pd->ether_type = ether_type;
690
691 if (fwnet_pd_is_complete(pd)) {
692 ether_type = pd->ether_type;
693 peer->pdg_size--;
694 skb = skb_get(pd->skb);
695 fwnet_pd_delete(pd);
696
697 spin_unlock_irqrestore(&dev->lock, flags);
698
699 return fwnet_finish_incoming_packet(net, skb, source_node_id,
700 false, ether_type);
701 }
702 /*
703 * Datagram is not complete, we're done for the
704 * moment.
705 */
706 retval = 0;
707 fail:
708 spin_unlock_irqrestore(&dev->lock, flags);
709
710 return retval;
711 }
712
713 static void fwnet_receive_packet(struct fw_card *card, struct fw_request *r,
714 int tcode, int destination, int source, int generation,
715 unsigned long long offset, void *payload, size_t length,
716 void *callback_data)
717 {
718 struct fwnet_device *dev = callback_data;
719 int rcode;
720
721 if (destination == IEEE1394_ALL_NODES) {
722 kfree(r);
723
724 return;
725 }
726
727 if (offset != dev->handler.offset)
728 rcode = RCODE_ADDRESS_ERROR;
729 else if (tcode != TCODE_WRITE_BLOCK_REQUEST)
730 rcode = RCODE_TYPE_ERROR;
731 else if (fwnet_incoming_packet(dev, payload, length,
732 source, generation, false) != 0) {
733 dev_err(&dev->netdev->dev, "incoming packet failure\n");
734 rcode = RCODE_CONFLICT_ERROR;
735 } else
736 rcode = RCODE_COMPLETE;
737
738 fw_send_response(card, r, rcode);
739 }
740
741 static int gasp_source_id(__be32 *p)
742 {
743 return be32_to_cpu(p[0]) >> 16;
744 }
745
746 static u32 gasp_specifier_id(__be32 *p)
747 {
748 return (be32_to_cpu(p[0]) & 0xffff) << 8 |
749 (be32_to_cpu(p[1]) & 0xff000000) >> 24;
750 }
751
752 static u32 gasp_version(__be32 *p)
753 {
754 return be32_to_cpu(p[1]) & 0xffffff;
755 }
756
757 static void fwnet_receive_broadcast(struct fw_iso_context *context,
758 u32 cycle, size_t header_length, void *header, void *data)
759 {
760 struct fwnet_device *dev;
761 struct fw_iso_packet packet;
762 __be16 *hdr_ptr;
763 __be32 *buf_ptr;
764 int retval;
765 u32 length;
766 unsigned long offset;
767 unsigned long flags;
768
769 dev = data;
770 hdr_ptr = header;
771 length = be16_to_cpup(hdr_ptr);
772
773 spin_lock_irqsave(&dev->lock, flags);
774
775 offset = dev->rcv_buffer_size * dev->broadcast_rcv_next_ptr;
776 buf_ptr = dev->broadcast_rcv_buffer_ptrs[dev->broadcast_rcv_next_ptr++];
777 if (dev->broadcast_rcv_next_ptr == dev->num_broadcast_rcv_ptrs)
778 dev->broadcast_rcv_next_ptr = 0;
779
780 spin_unlock_irqrestore(&dev->lock, flags);
781
782 if (length > IEEE1394_GASP_HDR_SIZE &&
783 gasp_specifier_id(buf_ptr) == IANA_SPECIFIER_ID &&
784 (gasp_version(buf_ptr) == RFC2734_SW_VERSION
785 #if IS_ENABLED(CONFIG_IPV6)
786 || gasp_version(buf_ptr) == RFC3146_SW_VERSION
787 #endif
788 ))
789 fwnet_incoming_packet(dev, buf_ptr + 2,
790 length - IEEE1394_GASP_HDR_SIZE,
791 gasp_source_id(buf_ptr),
792 context->card->generation, true);
793
794 packet.payload_length = dev->rcv_buffer_size;
795 packet.interrupt = 1;
796 packet.skip = 0;
797 packet.tag = 3;
798 packet.sy = 0;
799 packet.header_length = IEEE1394_GASP_HDR_SIZE;
800
801 spin_lock_irqsave(&dev->lock, flags);
802
803 retval = fw_iso_context_queue(dev->broadcast_rcv_context, &packet,
804 &dev->broadcast_rcv_buffer, offset);
805
806 spin_unlock_irqrestore(&dev->lock, flags);
807
808 if (retval >= 0)
809 fw_iso_context_queue_flush(dev->broadcast_rcv_context);
810 else
811 dev_err(&dev->netdev->dev, "requeue failed\n");
812 }
813
814 static struct kmem_cache *fwnet_packet_task_cache;
815
816 static void fwnet_free_ptask(struct fwnet_packet_task *ptask)
817 {
818 dev_kfree_skb_any(ptask->skb);
819 kmem_cache_free(fwnet_packet_task_cache, ptask);
820 }
821
822 /* Caller must hold dev->lock. */
823 static void dec_queued_datagrams(struct fwnet_device *dev)
824 {
825 if (--dev->queued_datagrams == FWNET_MIN_QUEUED_DATAGRAMS)
826 netif_wake_queue(dev->netdev);
827 }
828
829 static int fwnet_send_packet(struct fwnet_packet_task *ptask);
830
831 static void fwnet_transmit_packet_done(struct fwnet_packet_task *ptask)
832 {
833 struct fwnet_device *dev = ptask->dev;
834 struct sk_buff *skb = ptask->skb;
835 unsigned long flags;
836 bool free;
837
838 spin_lock_irqsave(&dev->lock, flags);
839
840 ptask->outstanding_pkts--;
841
842 /* Check whether we or the networking TX soft-IRQ is last user. */
843 free = (ptask->outstanding_pkts == 0 && ptask->enqueued);
844 if (free)
845 dec_queued_datagrams(dev);
846
847 if (ptask->outstanding_pkts == 0) {
848 dev->netdev->stats.tx_packets++;
849 dev->netdev->stats.tx_bytes += skb->len;
850 }
851
852 spin_unlock_irqrestore(&dev->lock, flags);
853
854 if (ptask->outstanding_pkts > 0) {
855 u16 dg_size;
856 u16 fg_off;
857 u16 datagram_label;
858 u16 lf;
859
860 /* Update the ptask to point to the next fragment and send it */
861 lf = fwnet_get_hdr_lf(&ptask->hdr);
862 switch (lf) {
863 case RFC2374_HDR_LASTFRAG:
864 case RFC2374_HDR_UNFRAG:
865 default:
866 dev_err(&dev->netdev->dev,
867 "outstanding packet %x lf %x, header %x,%x\n",
868 ptask->outstanding_pkts, lf, ptask->hdr.w0,
869 ptask->hdr.w1);
870 BUG();
871
872 case RFC2374_HDR_FIRSTFRAG:
873 /* Set frag type here for future interior fragments */
874 dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
875 fg_off = ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
876 datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
877 break;
878
879 case RFC2374_HDR_INTFRAG:
880 dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
881 fg_off = fwnet_get_hdr_fg_off(&ptask->hdr)
882 + ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
883 datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
884 break;
885 }
886
887 if (ptask->dest_node == IEEE1394_ALL_NODES) {
888 skb_pull(skb,
889 ptask->max_payload + IEEE1394_GASP_HDR_SIZE);
890 } else {
891 skb_pull(skb, ptask->max_payload);
892 }
893 if (ptask->outstanding_pkts > 1) {
894 fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_INTFRAG,
895 dg_size, fg_off, datagram_label);
896 } else {
897 fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_LASTFRAG,
898 dg_size, fg_off, datagram_label);
899 ptask->max_payload = skb->len + RFC2374_FRAG_HDR_SIZE;
900 }
901 fwnet_send_packet(ptask);
902 }
903
904 if (free)
905 fwnet_free_ptask(ptask);
906 }
907
908 static void fwnet_transmit_packet_failed(struct fwnet_packet_task *ptask)
909 {
910 struct fwnet_device *dev = ptask->dev;
911 unsigned long flags;
912 bool free;
913
914 spin_lock_irqsave(&dev->lock, flags);
915
916 /* One fragment failed; don't try to send remaining fragments. */
917 ptask->outstanding_pkts = 0;
918
919 /* Check whether we or the networking TX soft-IRQ is last user. */
920 free = ptask->enqueued;
921 if (free)
922 dec_queued_datagrams(dev);
923
924 dev->netdev->stats.tx_dropped++;
925 dev->netdev->stats.tx_errors++;
926
927 spin_unlock_irqrestore(&dev->lock, flags);
928
929 if (free)
930 fwnet_free_ptask(ptask);
931 }
932
933 static void fwnet_write_complete(struct fw_card *card, int rcode,
934 void *payload, size_t length, void *data)
935 {
936 struct fwnet_packet_task *ptask = data;
937 static unsigned long j;
938 static int last_rcode, errors_skipped;
939
940 if (rcode == RCODE_COMPLETE) {
941 fwnet_transmit_packet_done(ptask);
942 } else {
943 if (printk_timed_ratelimit(&j, 1000) || rcode != last_rcode) {
944 dev_err(&ptask->dev->netdev->dev,
945 "fwnet_write_complete failed: %x (skipped %d)\n",
946 rcode, errors_skipped);
947
948 errors_skipped = 0;
949 last_rcode = rcode;
950 } else {
951 errors_skipped++;
952 }
953 fwnet_transmit_packet_failed(ptask);
954 }
955 }
956
957 static int fwnet_send_packet(struct fwnet_packet_task *ptask)
958 {
959 struct fwnet_device *dev;
960 unsigned tx_len;
961 struct rfc2734_header *bufhdr;
962 unsigned long flags;
963 bool free;
964
965 dev = ptask->dev;
966 tx_len = ptask->max_payload;
967 switch (fwnet_get_hdr_lf(&ptask->hdr)) {
968 case RFC2374_HDR_UNFRAG:
969 bufhdr = skb_push(ptask->skb, RFC2374_UNFRAG_HDR_SIZE);
970 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
971 break;
972
973 case RFC2374_HDR_FIRSTFRAG:
974 case RFC2374_HDR_INTFRAG:
975 case RFC2374_HDR_LASTFRAG:
976 bufhdr = skb_push(ptask->skb, RFC2374_FRAG_HDR_SIZE);
977 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
978 put_unaligned_be32(ptask->hdr.w1, &bufhdr->w1);
979 break;
980
981 default:
982 BUG();
983 }
984 if (ptask->dest_node == IEEE1394_ALL_NODES) {
985 u8 *p;
986 int generation;
987 int node_id;
988 unsigned int sw_version;
989
990 /* ptask->generation may not have been set yet */
991 generation = dev->card->generation;
992 smp_rmb();
993 node_id = dev->card->node_id;
994
995 switch (ptask->skb->protocol) {
996 default:
997 sw_version = RFC2734_SW_VERSION;
998 break;
999 #if IS_ENABLED(CONFIG_IPV6)
1000 case htons(ETH_P_IPV6):
1001 sw_version = RFC3146_SW_VERSION;
1002 #endif
1003 }
1004
1005 p = skb_push(ptask->skb, IEEE1394_GASP_HDR_SIZE);
1006 put_unaligned_be32(node_id << 16 | IANA_SPECIFIER_ID >> 8, p);
1007 put_unaligned_be32((IANA_SPECIFIER_ID & 0xff) << 24
1008 | sw_version, &p[4]);
1009
1010 /* We should not transmit if broadcast_channel.valid == 0. */
1011 fw_send_request(dev->card, &ptask->transaction,
1012 TCODE_STREAM_DATA,
1013 fw_stream_packet_destination_id(3,
1014 IEEE1394_BROADCAST_CHANNEL, 0),
1015 generation, SCODE_100, 0ULL, ptask->skb->data,
1016 tx_len + 8, fwnet_write_complete, ptask);
1017
1018 spin_lock_irqsave(&dev->lock, flags);
1019
1020 /* If the AT tasklet already ran, we may be last user. */
1021 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1022 if (!free)
1023 ptask->enqueued = true;
1024 else
1025 dec_queued_datagrams(dev);
1026
1027 spin_unlock_irqrestore(&dev->lock, flags);
1028
1029 goto out;
1030 }
1031
1032 fw_send_request(dev->card, &ptask->transaction,
1033 TCODE_WRITE_BLOCK_REQUEST, ptask->dest_node,
1034 ptask->generation, ptask->speed, ptask->fifo_addr,
1035 ptask->skb->data, tx_len, fwnet_write_complete, ptask);
1036
1037 spin_lock_irqsave(&dev->lock, flags);
1038
1039 /* If the AT tasklet already ran, we may be last user. */
1040 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1041 if (!free)
1042 ptask->enqueued = true;
1043 else
1044 dec_queued_datagrams(dev);
1045
1046 spin_unlock_irqrestore(&dev->lock, flags);
1047
1048 netif_trans_update(dev->netdev);
1049 out:
1050 if (free)
1051 fwnet_free_ptask(ptask);
1052
1053 return 0;
1054 }
1055
1056 static void fwnet_fifo_stop(struct fwnet_device *dev)
1057 {
1058 if (dev->local_fifo == FWNET_NO_FIFO_ADDR)
1059 return;
1060
1061 fw_core_remove_address_handler(&dev->handler);
1062 dev->local_fifo = FWNET_NO_FIFO_ADDR;
1063 }
1064
1065 static int fwnet_fifo_start(struct fwnet_device *dev)
1066 {
1067 int retval;
1068
1069 if (dev->local_fifo != FWNET_NO_FIFO_ADDR)
1070 return 0;
1071
1072 dev->handler.length = 4096;
1073 dev->handler.address_callback = fwnet_receive_packet;
1074 dev->handler.callback_data = dev;
1075
1076 retval = fw_core_add_address_handler(&dev->handler,
1077 &fw_high_memory_region);
1078 if (retval < 0)
1079 return retval;
1080
1081 dev->local_fifo = dev->handler.offset;
1082
1083 return 0;
1084 }
1085
1086 static void __fwnet_broadcast_stop(struct fwnet_device *dev)
1087 {
1088 unsigned u;
1089
1090 if (dev->broadcast_state != FWNET_BROADCAST_ERROR) {
1091 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++)
1092 kunmap(dev->broadcast_rcv_buffer.pages[u]);
1093 fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer, dev->card);
1094 }
1095 if (dev->broadcast_rcv_context) {
1096 fw_iso_context_destroy(dev->broadcast_rcv_context);
1097 dev->broadcast_rcv_context = NULL;
1098 }
1099 kfree(dev->broadcast_rcv_buffer_ptrs);
1100 dev->broadcast_rcv_buffer_ptrs = NULL;
1101 dev->broadcast_state = FWNET_BROADCAST_ERROR;
1102 }
1103
1104 static void fwnet_broadcast_stop(struct fwnet_device *dev)
1105 {
1106 if (dev->broadcast_state == FWNET_BROADCAST_ERROR)
1107 return;
1108 fw_iso_context_stop(dev->broadcast_rcv_context);
1109 __fwnet_broadcast_stop(dev);
1110 }
1111
1112 static int fwnet_broadcast_start(struct fwnet_device *dev)
1113 {
1114 struct fw_iso_context *context;
1115 int retval;
1116 unsigned num_packets;
1117 unsigned max_receive;
1118 struct fw_iso_packet packet;
1119 unsigned long offset;
1120 void **ptrptr;
1121 unsigned u;
1122
1123 if (dev->broadcast_state != FWNET_BROADCAST_ERROR)
1124 return 0;
1125
1126 max_receive = 1U << (dev->card->max_receive + 1);
1127 num_packets = (FWNET_ISO_PAGE_COUNT * PAGE_SIZE) / max_receive;
1128
1129 ptrptr = kmalloc_array(num_packets, sizeof(void *), GFP_KERNEL);
1130 if (!ptrptr) {
1131 retval = -ENOMEM;
1132 goto failed;
1133 }
1134 dev->broadcast_rcv_buffer_ptrs = ptrptr;
1135
1136 context = fw_iso_context_create(dev->card, FW_ISO_CONTEXT_RECEIVE,
1137 IEEE1394_BROADCAST_CHANNEL,
1138 dev->card->link_speed, 8,
1139 fwnet_receive_broadcast, dev);
1140 if (IS_ERR(context)) {
1141 retval = PTR_ERR(context);
1142 goto failed;
1143 }
1144
1145 retval = fw_iso_buffer_init(&dev->broadcast_rcv_buffer, dev->card,
1146 FWNET_ISO_PAGE_COUNT, DMA_FROM_DEVICE);
1147 if (retval < 0)
1148 goto failed;
1149
1150 dev->broadcast_state = FWNET_BROADCAST_STOPPED;
1151
1152 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++) {
1153 void *ptr;
1154 unsigned v;
1155
1156 ptr = kmap(dev->broadcast_rcv_buffer.pages[u]);
1157 for (v = 0; v < num_packets / FWNET_ISO_PAGE_COUNT; v++)
1158 *ptrptr++ = (void *) ((char *)ptr + v * max_receive);
1159 }
1160 dev->broadcast_rcv_context = context;
1161
1162 packet.payload_length = max_receive;
1163 packet.interrupt = 1;
1164 packet.skip = 0;
1165 packet.tag = 3;
1166 packet.sy = 0;
1167 packet.header_length = IEEE1394_GASP_HDR_SIZE;
1168 offset = 0;
1169
1170 for (u = 0; u < num_packets; u++) {
1171 retval = fw_iso_context_queue(context, &packet,
1172 &dev->broadcast_rcv_buffer, offset);
1173 if (retval < 0)
1174 goto failed;
1175
1176 offset += max_receive;
1177 }
1178 dev->num_broadcast_rcv_ptrs = num_packets;
1179 dev->rcv_buffer_size = max_receive;
1180 dev->broadcast_rcv_next_ptr = 0U;
1181 retval = fw_iso_context_start(context, -1, 0,
1182 FW_ISO_CONTEXT_MATCH_ALL_TAGS); /* ??? sync */
1183 if (retval < 0)
1184 goto failed;
1185
1186 /* FIXME: adjust it according to the min. speed of all known peers? */
1187 dev->broadcast_xmt_max_payload = IEEE1394_MAX_PAYLOAD_S100
1188 - IEEE1394_GASP_HDR_SIZE - RFC2374_UNFRAG_HDR_SIZE;
1189 dev->broadcast_state = FWNET_BROADCAST_RUNNING;
1190
1191 return 0;
1192
1193 failed:
1194 __fwnet_broadcast_stop(dev);
1195 return retval;
1196 }
1197
1198 static void set_carrier_state(struct fwnet_device *dev)
1199 {
1200 if (dev->peer_count > 1)
1201 netif_carrier_on(dev->netdev);
1202 else
1203 netif_carrier_off(dev->netdev);
1204 }
1205
1206 /* ifup */
1207 static int fwnet_open(struct net_device *net)
1208 {
1209 struct fwnet_device *dev = netdev_priv(net);
1210 int ret;
1211
1212 ret = fwnet_broadcast_start(dev);
1213 if (ret)
1214 return ret;
1215
1216 netif_start_queue(net);
1217
1218 spin_lock_irq(&dev->lock);
1219 set_carrier_state(dev);
1220 spin_unlock_irq(&dev->lock);
1221
1222 return 0;
1223 }
1224
1225 /* ifdown */
1226 static int fwnet_stop(struct net_device *net)
1227 {
1228 struct fwnet_device *dev = netdev_priv(net);
1229
1230 netif_stop_queue(net);
1231 fwnet_broadcast_stop(dev);
1232
1233 return 0;
1234 }
1235
1236 static netdev_tx_t fwnet_tx(struct sk_buff *skb, struct net_device *net)
1237 {
1238 struct fwnet_header hdr_buf;
1239 struct fwnet_device *dev = netdev_priv(net);
1240 __be16 proto;
1241 u16 dest_node;
1242 unsigned max_payload;
1243 u16 dg_size;
1244 u16 *datagram_label_ptr;
1245 struct fwnet_packet_task *ptask;
1246 struct fwnet_peer *peer;
1247 unsigned long flags;
1248
1249 spin_lock_irqsave(&dev->lock, flags);
1250
1251 /* Can this happen? */
1252 if (netif_queue_stopped(dev->netdev)) {
1253 spin_unlock_irqrestore(&dev->lock, flags);
1254
1255 return NETDEV_TX_BUSY;
1256 }
1257
1258 ptask = kmem_cache_alloc(fwnet_packet_task_cache, GFP_ATOMIC);
1259 if (ptask == NULL)
1260 goto fail;
1261
1262 skb = skb_share_check(skb, GFP_ATOMIC);
1263 if (!skb)
1264 goto fail;
1265
1266 /*
1267 * Make a copy of the driver-specific header.
1268 * We might need to rebuild the header on tx failure.
1269 */
1270 memcpy(&hdr_buf, skb->data, sizeof(hdr_buf));
1271 proto = hdr_buf.h_proto;
1272
1273 switch (proto) {
1274 case htons(ETH_P_ARP):
1275 case htons(ETH_P_IP):
1276 #if IS_ENABLED(CONFIG_IPV6)
1277 case htons(ETH_P_IPV6):
1278 #endif
1279 break;
1280 default:
1281 goto fail;
1282 }
1283
1284 skb_pull(skb, sizeof(hdr_buf));
1285 dg_size = skb->len;
1286
1287 /*
1288 * Set the transmission type for the packet. ARP packets and IP
1289 * broadcast packets are sent via GASP.
1290 */
1291 if (fwnet_hwaddr_is_multicast(hdr_buf.h_dest)) {
1292 max_payload = dev->broadcast_xmt_max_payload;
1293 datagram_label_ptr = &dev->broadcast_xmt_datagramlabel;
1294
1295 ptask->fifo_addr = FWNET_NO_FIFO_ADDR;
1296 ptask->generation = 0;
1297 ptask->dest_node = IEEE1394_ALL_NODES;
1298 ptask->speed = SCODE_100;
1299 } else {
1300 union fwnet_hwaddr *ha = (union fwnet_hwaddr *)hdr_buf.h_dest;
1301 __be64 guid = get_unaligned(&ha->uc.uniq_id);
1302 u8 generation;
1303
1304 peer = fwnet_peer_find_by_guid(dev, be64_to_cpu(guid));
1305 if (!peer)
1306 goto fail;
1307
1308 generation = peer->generation;
1309 dest_node = peer->node_id;
1310 max_payload = peer->max_payload;
1311 datagram_label_ptr = &peer->datagram_label;
1312
1313 ptask->fifo_addr = fwnet_hwaddr_fifo(ha);
1314 ptask->generation = generation;
1315 ptask->dest_node = dest_node;
1316 ptask->speed = peer->speed;
1317 }
1318
1319 ptask->hdr.w0 = 0;
1320 ptask->hdr.w1 = 0;
1321 ptask->skb = skb;
1322 ptask->dev = dev;
1323
1324 /* Does it all fit in one packet? */
1325 if (dg_size <= max_payload) {
1326 fwnet_make_uf_hdr(&ptask->hdr, ntohs(proto));
1327 ptask->outstanding_pkts = 1;
1328 max_payload = dg_size + RFC2374_UNFRAG_HDR_SIZE;
1329 } else {
1330 u16 datagram_label;
1331
1332 max_payload -= RFC2374_FRAG_OVERHEAD;
1333 datagram_label = (*datagram_label_ptr)++;
1334 fwnet_make_ff_hdr(&ptask->hdr, ntohs(proto), dg_size,
1335 datagram_label);
1336 ptask->outstanding_pkts = DIV_ROUND_UP(dg_size, max_payload);
1337 max_payload += RFC2374_FRAG_HDR_SIZE;
1338 }
1339
1340 if (++dev->queued_datagrams == FWNET_MAX_QUEUED_DATAGRAMS)
1341 netif_stop_queue(dev->netdev);
1342
1343 spin_unlock_irqrestore(&dev->lock, flags);
1344
1345 ptask->max_payload = max_payload;
1346 ptask->enqueued = 0;
1347
1348 fwnet_send_packet(ptask);
1349
1350 return NETDEV_TX_OK;
1351
1352 fail:
1353 spin_unlock_irqrestore(&dev->lock, flags);
1354
1355 if (ptask)
1356 kmem_cache_free(fwnet_packet_task_cache, ptask);
1357
1358 if (skb != NULL)
1359 dev_kfree_skb(skb);
1360
1361 net->stats.tx_dropped++;
1362 net->stats.tx_errors++;
1363
1364 /*
1365 * FIXME: According to a patch from 2003-02-26, "returning non-zero
1366 * causes serious problems" here, allegedly. Before that patch,
1367 * -ERRNO was returned which is not appropriate under Linux 2.6.
1368 * Perhaps more needs to be done? Stop the queue in serious
1369 * conditions and restart it elsewhere?
1370 */
1371 return NETDEV_TX_OK;
1372 }
1373
1374 static const struct ethtool_ops fwnet_ethtool_ops = {
1375 .get_link = ethtool_op_get_link,
1376 };
1377
1378 static const struct net_device_ops fwnet_netdev_ops = {
1379 .ndo_open = fwnet_open,
1380 .ndo_stop = fwnet_stop,
1381 .ndo_start_xmit = fwnet_tx,
1382 };
1383
1384 static void fwnet_init_dev(struct net_device *net)
1385 {
1386 net->header_ops = &fwnet_header_ops;
1387 net->netdev_ops = &fwnet_netdev_ops;
1388 net->watchdog_timeo = 2 * HZ;
1389 net->flags = IFF_BROADCAST | IFF_MULTICAST;
1390 net->features = NETIF_F_HIGHDMA;
1391 net->addr_len = FWNET_ALEN;
1392 net->hard_header_len = FWNET_HLEN;
1393 net->type = ARPHRD_IEEE1394;
1394 net->tx_queue_len = FWNET_TX_QUEUE_LEN;
1395 net->ethtool_ops = &fwnet_ethtool_ops;
1396 }
1397
1398 /* caller must hold fwnet_device_mutex */
1399 static struct fwnet_device *fwnet_dev_find(struct fw_card *card)
1400 {
1401 struct fwnet_device *dev;
1402
1403 list_for_each_entry(dev, &fwnet_device_list, dev_link)
1404 if (dev->card == card)
1405 return dev;
1406
1407 return NULL;
1408 }
1409
1410 static int fwnet_add_peer(struct fwnet_device *dev,
1411 struct fw_unit *unit, struct fw_device *device)
1412 {
1413 struct fwnet_peer *peer;
1414
1415 peer = kmalloc(sizeof(*peer), GFP_KERNEL);
1416 if (!peer)
1417 return -ENOMEM;
1418
1419 dev_set_drvdata(&unit->device, peer);
1420
1421 peer->dev = dev;
1422 peer->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4];
1423 INIT_LIST_HEAD(&peer->pd_list);
1424 peer->pdg_size = 0;
1425 peer->datagram_label = 0;
1426 peer->speed = device->max_speed;
1427 peer->max_payload = fwnet_max_payload(device->max_rec, peer->speed);
1428
1429 peer->generation = device->generation;
1430 smp_rmb();
1431 peer->node_id = device->node_id;
1432
1433 spin_lock_irq(&dev->lock);
1434 list_add_tail(&peer->peer_link, &dev->peer_list);
1435 dev->peer_count++;
1436 set_carrier_state(dev);
1437 spin_unlock_irq(&dev->lock);
1438
1439 return 0;
1440 }
1441
1442 static int fwnet_probe(struct fw_unit *unit,
1443 const struct ieee1394_device_id *id)
1444 {
1445 struct fw_device *device = fw_parent_device(unit);
1446 struct fw_card *card = device->card;
1447 struct net_device *net;
1448 bool allocated_netdev = false;
1449 struct fwnet_device *dev;
1450 int ret;
1451 union fwnet_hwaddr *ha;
1452
1453 mutex_lock(&fwnet_device_mutex);
1454
1455 dev = fwnet_dev_find(card);
1456 if (dev) {
1457 net = dev->netdev;
1458 goto have_dev;
1459 }
1460
1461 net = alloc_netdev(sizeof(*dev), "firewire%d", NET_NAME_UNKNOWN,
1462 fwnet_init_dev);
1463 if (net == NULL) {
1464 mutex_unlock(&fwnet_device_mutex);
1465 return -ENOMEM;
1466 }
1467
1468 allocated_netdev = true;
1469 SET_NETDEV_DEV(net, card->device);
1470 dev = netdev_priv(net);
1471
1472 spin_lock_init(&dev->lock);
1473 dev->broadcast_state = FWNET_BROADCAST_ERROR;
1474 dev->broadcast_rcv_context = NULL;
1475 dev->broadcast_xmt_max_payload = 0;
1476 dev->broadcast_xmt_datagramlabel = 0;
1477 dev->local_fifo = FWNET_NO_FIFO_ADDR;
1478 dev->queued_datagrams = 0;
1479 INIT_LIST_HEAD(&dev->peer_list);
1480 dev->card = card;
1481 dev->netdev = net;
1482
1483 ret = fwnet_fifo_start(dev);
1484 if (ret < 0)
1485 goto out;
1486 dev->local_fifo = dev->handler.offset;
1487
1488 /*
1489 * default MTU: RFC 2734 cl. 4, RFC 3146 cl. 4
1490 * maximum MTU: RFC 2734 cl. 4.2, fragment encapsulation header's
1491 * maximum possible datagram_size + 1 = 0xfff + 1
1492 */
1493 net->mtu = 1500U;
1494 net->min_mtu = ETH_MIN_MTU;
1495 net->max_mtu = 4096U;
1496
1497 /* Set our hardware address while we're at it */
1498 ha = (union fwnet_hwaddr *)net->dev_addr;
1499 put_unaligned_be64(card->guid, &ha->uc.uniq_id);
1500 ha->uc.max_rec = dev->card->max_receive;
1501 ha->uc.sspd = dev->card->link_speed;
1502 put_unaligned_be16(dev->local_fifo >> 32, &ha->uc.fifo_hi);
1503 put_unaligned_be32(dev->local_fifo & 0xffffffff, &ha->uc.fifo_lo);
1504
1505 memset(net->broadcast, -1, net->addr_len);
1506
1507 ret = register_netdev(net);
1508 if (ret)
1509 goto out;
1510
1511 list_add_tail(&dev->dev_link, &fwnet_device_list);
1512 dev_notice(&net->dev, "IP over IEEE 1394 on card %s\n",
1513 dev_name(card->device));
1514 have_dev:
1515 ret = fwnet_add_peer(dev, unit, device);
1516 if (ret && allocated_netdev) {
1517 unregister_netdev(net);
1518 list_del(&dev->dev_link);
1519 out:
1520 fwnet_fifo_stop(dev);
1521 free_netdev(net);
1522 }
1523
1524 mutex_unlock(&fwnet_device_mutex);
1525
1526 return ret;
1527 }
1528
1529 /*
1530 * FIXME abort partially sent fragmented datagrams,
1531 * discard partially received fragmented datagrams
1532 */
1533 static void fwnet_update(struct fw_unit *unit)
1534 {
1535 struct fw_device *device = fw_parent_device(unit);
1536 struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1537 int generation;
1538
1539 generation = device->generation;
1540
1541 spin_lock_irq(&peer->dev->lock);
1542 peer->node_id = device->node_id;
1543 peer->generation = generation;
1544 spin_unlock_irq(&peer->dev->lock);
1545 }
1546
1547 static void fwnet_remove_peer(struct fwnet_peer *peer, struct fwnet_device *dev)
1548 {
1549 struct fwnet_partial_datagram *pd, *pd_next;
1550
1551 spin_lock_irq(&dev->lock);
1552 list_del(&peer->peer_link);
1553 dev->peer_count--;
1554 set_carrier_state(dev);
1555 spin_unlock_irq(&dev->lock);
1556
1557 list_for_each_entry_safe(pd, pd_next, &peer->pd_list, pd_link)
1558 fwnet_pd_delete(pd);
1559
1560 kfree(peer);
1561 }
1562
1563 static void fwnet_remove(struct fw_unit *unit)
1564 {
1565 struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1566 struct fwnet_device *dev = peer->dev;
1567 struct net_device *net;
1568 int i;
1569
1570 mutex_lock(&fwnet_device_mutex);
1571
1572 net = dev->netdev;
1573
1574 fwnet_remove_peer(peer, dev);
1575
1576 if (list_empty(&dev->peer_list)) {
1577 unregister_netdev(net);
1578
1579 fwnet_fifo_stop(dev);
1580
1581 for (i = 0; dev->queued_datagrams && i < 5; i++)
1582 ssleep(1);
1583 WARN_ON(dev->queued_datagrams);
1584 list_del(&dev->dev_link);
1585
1586 free_netdev(net);
1587 }
1588
1589 mutex_unlock(&fwnet_device_mutex);
1590 }
1591
1592 static const struct ieee1394_device_id fwnet_id_table[] = {
1593 {
1594 .match_flags = IEEE1394_MATCH_SPECIFIER_ID |
1595 IEEE1394_MATCH_VERSION,
1596 .specifier_id = IANA_SPECIFIER_ID,
1597 .version = RFC2734_SW_VERSION,
1598 },
1599 #if IS_ENABLED(CONFIG_IPV6)
1600 {
1601 .match_flags = IEEE1394_MATCH_SPECIFIER_ID |
1602 IEEE1394_MATCH_VERSION,
1603 .specifier_id = IANA_SPECIFIER_ID,
1604 .version = RFC3146_SW_VERSION,
1605 },
1606 #endif
1607 { }
1608 };
1609
1610 static struct fw_driver fwnet_driver = {
1611 .driver = {
1612 .owner = THIS_MODULE,
1613 .name = KBUILD_MODNAME,
1614 .bus = &fw_bus_type,
1615 },
1616 .probe = fwnet_probe,
1617 .update = fwnet_update,
1618 .remove = fwnet_remove,
1619 .id_table = fwnet_id_table,
1620 };
1621
1622 static const u32 rfc2374_unit_directory_data[] = {
1623 0x00040000, /* directory_length */
1624 0x1200005e, /* unit_specifier_id: IANA */
1625 0x81000003, /* textual descriptor offset */
1626 0x13000001, /* unit_sw_version: RFC 2734 */
1627 0x81000005, /* textual descriptor offset */
1628 0x00030000, /* descriptor_length */
1629 0x00000000, /* text */
1630 0x00000000, /* minimal ASCII, en */
1631 0x49414e41, /* I A N A */
1632 0x00030000, /* descriptor_length */
1633 0x00000000, /* text */
1634 0x00000000, /* minimal ASCII, en */
1635 0x49507634, /* I P v 4 */
1636 };
1637
1638 static struct fw_descriptor rfc2374_unit_directory = {
1639 .length = ARRAY_SIZE(rfc2374_unit_directory_data),
1640 .key = (CSR_DIRECTORY | CSR_UNIT) << 24,
1641 .data = rfc2374_unit_directory_data
1642 };
1643
1644 #if IS_ENABLED(CONFIG_IPV6)
1645 static const u32 rfc3146_unit_directory_data[] = {
1646 0x00040000, /* directory_length */
1647 0x1200005e, /* unit_specifier_id: IANA */
1648 0x81000003, /* textual descriptor offset */
1649 0x13000002, /* unit_sw_version: RFC 3146 */
1650 0x81000005, /* textual descriptor offset */
1651 0x00030000, /* descriptor_length */
1652 0x00000000, /* text */
1653 0x00000000, /* minimal ASCII, en */
1654 0x49414e41, /* I A N A */
1655 0x00030000, /* descriptor_length */
1656 0x00000000, /* text */
1657 0x00000000, /* minimal ASCII, en */
1658 0x49507636, /* I P v 6 */
1659 };
1660
1661 static struct fw_descriptor rfc3146_unit_directory = {
1662 .length = ARRAY_SIZE(rfc3146_unit_directory_data),
1663 .key = (CSR_DIRECTORY | CSR_UNIT) << 24,
1664 .data = rfc3146_unit_directory_data
1665 };
1666 #endif
1667
1668 static int __init fwnet_init(void)
1669 {
1670 int err;
1671
1672 err = fw_core_add_descriptor(&rfc2374_unit_directory);
1673 if (err)
1674 return err;
1675
1676 #if IS_ENABLED(CONFIG_IPV6)
1677 err = fw_core_add_descriptor(&rfc3146_unit_directory);
1678 if (err)
1679 goto out;
1680 #endif
1681
1682 fwnet_packet_task_cache = kmem_cache_create("packet_task",
1683 sizeof(struct fwnet_packet_task), 0, 0, NULL);
1684 if (!fwnet_packet_task_cache) {
1685 err = -ENOMEM;
1686 goto out2;
1687 }
1688
1689 err = driver_register(&fwnet_driver.driver);
1690 if (!err)
1691 return 0;
1692
1693 kmem_cache_destroy(fwnet_packet_task_cache);
1694 out2:
1695 #if IS_ENABLED(CONFIG_IPV6)
1696 fw_core_remove_descriptor(&rfc3146_unit_directory);
1697 out:
1698 #endif
1699 fw_core_remove_descriptor(&rfc2374_unit_directory);
1700
1701 return err;
1702 }
1703 module_init(fwnet_init);
1704
1705 static void __exit fwnet_cleanup(void)
1706 {
1707 driver_unregister(&fwnet_driver.driver);
1708 kmem_cache_destroy(fwnet_packet_task_cache);
1709 #if IS_ENABLED(CONFIG_IPV6)
1710 fw_core_remove_descriptor(&rfc3146_unit_directory);
1711 #endif
1712 fw_core_remove_descriptor(&rfc2374_unit_directory);
1713 }
1714 module_exit(fwnet_cleanup);
1715
1716 MODULE_AUTHOR("Jay Fenlason <fenlason@redhat.com>");
1717 MODULE_DESCRIPTION("IP over IEEE1394 as per RFC 2734/3146");
1718 MODULE_LICENSE("GPL");
1719 MODULE_DEVICE_TABLE(ieee1394, fwnet_id_table);
Linux with added FPC-III support