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mm/slab: sanity-check page type when looking up cache
[linux/fpc-iii.git] / drivers / firewire / net.c
blobb132ab9ad6078f5a9a3d57e3088387a9a0a05789
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 hh->hh_len = FWNET_HLEN;
254
255 return 0;
256 }
257
258 /* Called by Address Resolution module to notify changes in address. */
259 static void fwnet_header_cache_update(struct hh_cache *hh,
260 const struct net_device *net, const unsigned char *haddr)
261 {
262 memcpy((u8 *)hh->hh_data + HH_DATA_OFF(FWNET_HLEN), haddr, net->addr_len);
263 }
264
265 static int fwnet_header_parse(const struct sk_buff *skb, unsigned char *haddr)
266 {
267 memcpy(haddr, skb->dev->dev_addr, FWNET_ALEN);
268
269 return FWNET_ALEN;
270 }
271
272 static const struct header_ops fwnet_header_ops = {
273 .create = fwnet_header_create,
274 .cache = fwnet_header_cache,
275 .cache_update = fwnet_header_cache_update,
276 .parse = fwnet_header_parse,
277 };
278
279 /* FIXME: is this correct for all cases? */
280 static bool fwnet_frag_overlap(struct fwnet_partial_datagram *pd,
281 unsigned offset, unsigned len)
282 {
283 struct fwnet_fragment_info *fi;
284 unsigned end = offset + len;
285
286 list_for_each_entry(fi, &pd->fi_list, fi_link)
287 if (offset < fi->offset + fi->len && end > fi->offset)
288 return true;
289
290 return false;
291 }
292
293 /* Assumes that new fragment does not overlap any existing fragments */
294 static struct fwnet_fragment_info *fwnet_frag_new(
295 struct fwnet_partial_datagram *pd, unsigned offset, unsigned len)
296 {
297 struct fwnet_fragment_info *fi, *fi2, *new;
298 struct list_head *list;
299
300 list = &pd->fi_list;
301 list_for_each_entry(fi, &pd->fi_list, fi_link) {
302 if (fi->offset + fi->len == offset) {
303 /* The new fragment can be tacked on to the end */
304 /* Did the new fragment plug a hole? */
305 fi2 = list_entry(fi->fi_link.next,
306 struct fwnet_fragment_info, fi_link);
307 if (fi->offset + fi->len == fi2->offset) {
308 /* glue fragments together */
309 fi->len += len + fi2->len;
310 list_del(&fi2->fi_link);
311 kfree(fi2);
312 } else {
313 fi->len += len;
314 }
315
316 return fi;
317 }
318 if (offset + len == fi->offset) {
319 /* The new fragment can be tacked on to the beginning */
320 /* Did the new fragment plug a hole? */
321 fi2 = list_entry(fi->fi_link.prev,
322 struct fwnet_fragment_info, fi_link);
323 if (fi2->offset + fi2->len == fi->offset) {
324 /* glue fragments together */
325 fi2->len += fi->len + len;
326 list_del(&fi->fi_link);
327 kfree(fi);
328
329 return fi2;
330 }
331 fi->offset = offset;
332 fi->len += len;
333
334 return fi;
335 }
336 if (offset > fi->offset + fi->len) {
337 list = &fi->fi_link;
338 break;
339 }
340 if (offset + len < fi->offset) {
341 list = fi->fi_link.prev;
342 break;
343 }
344 }
345
346 new = kmalloc(sizeof(*new), GFP_ATOMIC);
347 if (!new)
348 return NULL;
349
350 new->offset = offset;
351 new->len = len;
352 list_add(&new->fi_link, list);
353
354 return new;
355 }
356
357 static struct fwnet_partial_datagram *fwnet_pd_new(struct net_device *net,
358 struct fwnet_peer *peer, u16 datagram_label, unsigned dg_size,
359 void *frag_buf, unsigned frag_off, unsigned frag_len)
360 {
361 struct fwnet_partial_datagram *new;
362 struct fwnet_fragment_info *fi;
363
364 new = kmalloc(sizeof(*new), GFP_ATOMIC);
365 if (!new)
366 goto fail;
367
368 INIT_LIST_HEAD(&new->fi_list);
369 fi = fwnet_frag_new(new, frag_off, frag_len);
370 if (fi == NULL)
371 goto fail_w_new;
372
373 new->datagram_label = datagram_label;
374 new->datagram_size = dg_size;
375 new->skb = dev_alloc_skb(dg_size + LL_RESERVED_SPACE(net));
376 if (new->skb == NULL)
377 goto fail_w_fi;
378
379 skb_reserve(new->skb, LL_RESERVED_SPACE(net));
380 new->pbuf = skb_put(new->skb, dg_size);
381 memcpy(new->pbuf + frag_off, frag_buf, frag_len);
382 list_add_tail(&new->pd_link, &peer->pd_list);
383
384 return new;
385
386 fail_w_fi:
387 kfree(fi);
388 fail_w_new:
389 kfree(new);
390 fail:
391 return NULL;
392 }
393
394 static struct fwnet_partial_datagram *fwnet_pd_find(struct fwnet_peer *peer,
395 u16 datagram_label)
396 {
397 struct fwnet_partial_datagram *pd;
398
399 list_for_each_entry(pd, &peer->pd_list, pd_link)
400 if (pd->datagram_label == datagram_label)
401 return pd;
402
403 return NULL;
404 }
405
406
407 static void fwnet_pd_delete(struct fwnet_partial_datagram *old)
408 {
409 struct fwnet_fragment_info *fi, *n;
410
411 list_for_each_entry_safe(fi, n, &old->fi_list, fi_link)
412 kfree(fi);
413
414 list_del(&old->pd_link);
415 dev_kfree_skb_any(old->skb);
416 kfree(old);
417 }
418
419 static bool fwnet_pd_update(struct fwnet_peer *peer,
420 struct fwnet_partial_datagram *pd, void *frag_buf,
421 unsigned frag_off, unsigned frag_len)
422 {
423 if (fwnet_frag_new(pd, frag_off, frag_len) == NULL)
424 return false;
425
426 memcpy(pd->pbuf + frag_off, frag_buf, frag_len);
427
428 /*
429 * Move list entry to beginning of list so that oldest partial
430 * datagrams percolate to the end of the list
431 */
432 list_move_tail(&pd->pd_link, &peer->pd_list);
433
434 return true;
435 }
436
437 static bool fwnet_pd_is_complete(struct fwnet_partial_datagram *pd)
438 {
439 struct fwnet_fragment_info *fi;
440
441 fi = list_entry(pd->fi_list.next, struct fwnet_fragment_info, fi_link);
442
443 return fi->len == pd->datagram_size;
444 }
445
446 /* caller must hold dev->lock */
447 static struct fwnet_peer *fwnet_peer_find_by_guid(struct fwnet_device *dev,
448 u64 guid)
449 {
450 struct fwnet_peer *peer;
451
452 list_for_each_entry(peer, &dev->peer_list, peer_link)
453 if (peer->guid == guid)
454 return peer;
455
456 return NULL;
457 }
458
459 /* caller must hold dev->lock */
460 static struct fwnet_peer *fwnet_peer_find_by_node_id(struct fwnet_device *dev,
461 int node_id, int generation)
462 {
463 struct fwnet_peer *peer;
464
465 list_for_each_entry(peer, &dev->peer_list, peer_link)
466 if (peer->node_id == node_id &&
467 peer->generation == generation)
468 return peer;
469
470 return NULL;
471 }
472
473 /* See IEEE 1394-2008 table 6-4, table 8-8, table 16-18. */
474 static unsigned fwnet_max_payload(unsigned max_rec, unsigned speed)
475 {
476 max_rec = min(max_rec, speed + 8);
477 max_rec = clamp(max_rec, 8U, 11U); /* 512...4096 */
478
479 return (1 << (max_rec + 1)) - RFC2374_FRAG_HDR_SIZE;
480 }
481
482
483 static int fwnet_finish_incoming_packet(struct net_device *net,
484 struct sk_buff *skb, u16 source_node_id,
485 bool is_broadcast, u16 ether_type)
486 {
487 struct fwnet_device *dev;
488 int status;
489 __be64 guid;
490
491 switch (ether_type) {
492 case ETH_P_ARP:
493 case ETH_P_IP:
494 #if IS_ENABLED(CONFIG_IPV6)
495 case ETH_P_IPV6:
496 #endif
497 break;
498 default:
499 goto err;
500 }
501
502 dev = netdev_priv(net);
503 /* Write metadata, and then pass to the receive level */
504 skb->dev = net;
505 skb->ip_summed = CHECKSUM_NONE;
506
507 /*
508 * Parse the encapsulation header. This actually does the job of
509 * converting to an ethernet-like pseudo frame header.
510 */
511 guid = cpu_to_be64(dev->card->guid);
512 if (dev_hard_header(skb, net, ether_type,
513 is_broadcast ? net->broadcast : net->dev_addr,
514 NULL, skb->len) >= 0) {
515 struct fwnet_header *eth;
516 u16 *rawp;
517 __be16 protocol;
518
519 skb_reset_mac_header(skb);
520 skb_pull(skb, sizeof(*eth));
521 eth = (struct fwnet_header *)skb_mac_header(skb);
522 if (fwnet_hwaddr_is_multicast(eth->h_dest)) {
523 if (memcmp(eth->h_dest, net->broadcast,
524 net->addr_len) == 0)
525 skb->pkt_type = PACKET_BROADCAST;
526 #if 0
527 else
528 skb->pkt_type = PACKET_MULTICAST;
529 #endif
530 } else {
531 if (memcmp(eth->h_dest, net->dev_addr, net->addr_len))
532 skb->pkt_type = PACKET_OTHERHOST;
533 }
534 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN) {
535 protocol = eth->h_proto;
536 } else {
537 rawp = (u16 *)skb->data;
538 if (*rawp == 0xffff)
539 protocol = htons(ETH_P_802_3);
540 else
541 protocol = htons(ETH_P_802_2);
542 }
543 skb->protocol = protocol;
544 }
545 status = netif_rx(skb);
546 if (status == NET_RX_DROP) {
547 net->stats.rx_errors++;
548 net->stats.rx_dropped++;
549 } else {
550 net->stats.rx_packets++;
551 net->stats.rx_bytes += skb->len;
552 }
553
554 return 0;
555
556 err:
557 net->stats.rx_errors++;
558 net->stats.rx_dropped++;
559
560 dev_kfree_skb_any(skb);
561
562 return -ENOENT;
563 }
564
565 static int fwnet_incoming_packet(struct fwnet_device *dev, __be32 *buf, int len,
566 int source_node_id, int generation,
567 bool is_broadcast)
568 {
569 struct sk_buff *skb;
570 struct net_device *net = dev->netdev;
571 struct rfc2734_header hdr;
572 unsigned lf;
573 unsigned long flags;
574 struct fwnet_peer *peer;
575 struct fwnet_partial_datagram *pd;
576 int fg_off;
577 int dg_size;
578 u16 datagram_label;
579 int retval;
580 u16 ether_type;
581
582 if (len <= RFC2374_UNFRAG_HDR_SIZE)
583 return 0;
584
585 hdr.w0 = be32_to_cpu(buf[0]);
586 lf = fwnet_get_hdr_lf(&hdr);
587 if (lf == RFC2374_HDR_UNFRAG) {
588 /*
589 * An unfragmented datagram has been received by the ieee1394
590 * bus. Build an skbuff around it so we can pass it to the
591 * high level network layer.
592 */
593 ether_type = fwnet_get_hdr_ether_type(&hdr);
594 buf++;
595 len -= RFC2374_UNFRAG_HDR_SIZE;
596
597 skb = dev_alloc_skb(len + LL_RESERVED_SPACE(net));
598 if (unlikely(!skb)) {
599 net->stats.rx_dropped++;
600
601 return -ENOMEM;
602 }
603 skb_reserve(skb, LL_RESERVED_SPACE(net));
604 skb_put_data(skb, buf, len);
605
606 return fwnet_finish_incoming_packet(net, skb, source_node_id,
607 is_broadcast, ether_type);
608 }
609
610 /* A datagram fragment has been received, now the fun begins. */
611
612 if (len <= RFC2374_FRAG_HDR_SIZE)
613 return 0;
614
615 hdr.w1 = ntohl(buf[1]);
616 buf += 2;
617 len -= RFC2374_FRAG_HDR_SIZE;
618 if (lf == RFC2374_HDR_FIRSTFRAG) {
619 ether_type = fwnet_get_hdr_ether_type(&hdr);
620 fg_off = 0;
621 } else {
622 ether_type = 0;
623 fg_off = fwnet_get_hdr_fg_off(&hdr);
624 }
625 datagram_label = fwnet_get_hdr_dgl(&hdr);
626 dg_size = fwnet_get_hdr_dg_size(&hdr);
627
628 if (fg_off + len > dg_size)
629 return 0;
630
631 spin_lock_irqsave(&dev->lock, flags);
632
633 peer = fwnet_peer_find_by_node_id(dev, source_node_id, generation);
634 if (!peer) {
635 retval = -ENOENT;
636 goto fail;
637 }
638
639 pd = fwnet_pd_find(peer, datagram_label);
640 if (pd == NULL) {
641 while (peer->pdg_size >= FWNET_MAX_FRAGMENTS) {
642 /* remove the oldest */
643 fwnet_pd_delete(list_first_entry(&peer->pd_list,
644 struct fwnet_partial_datagram, pd_link));
645 peer->pdg_size--;
646 }
647 pd = fwnet_pd_new(net, peer, datagram_label,
648 dg_size, buf, fg_off, len);
649 if (pd == NULL) {
650 retval = -ENOMEM;
651 goto fail;
652 }
653 peer->pdg_size++;
654 } else {
655 if (fwnet_frag_overlap(pd, fg_off, len) ||
656 pd->datagram_size != dg_size) {
657 /*
658 * Differing datagram sizes or overlapping fragments,
659 * discard old datagram and start a new one.
660 */
661 fwnet_pd_delete(pd);
662 pd = fwnet_pd_new(net, peer, datagram_label,
663 dg_size, buf, fg_off, len);
664 if (pd == NULL) {
665 peer->pdg_size--;
666 retval = -ENOMEM;
667 goto fail;
668 }
669 } else {
670 if (!fwnet_pd_update(peer, pd, buf, fg_off, len)) {
671 /*
672 * Couldn't save off fragment anyway
673 * so might as well obliterate the
674 * datagram now.
675 */
676 fwnet_pd_delete(pd);
677 peer->pdg_size--;
678 retval = -ENOMEM;
679 goto fail;
680 }
681 }
682 } /* new datagram or add to existing one */
683
684 if (lf == RFC2374_HDR_FIRSTFRAG)
685 pd->ether_type = ether_type;
686
687 if (fwnet_pd_is_complete(pd)) {
688 ether_type = pd->ether_type;
689 peer->pdg_size--;
690 skb = skb_get(pd->skb);
691 fwnet_pd_delete(pd);
692
693 spin_unlock_irqrestore(&dev->lock, flags);
694
695 return fwnet_finish_incoming_packet(net, skb, source_node_id,
696 false, ether_type);
697 }
698 /*
699 * Datagram is not complete, we're done for the
700 * moment.
701 */
702 retval = 0;
703 fail:
704 spin_unlock_irqrestore(&dev->lock, flags);
705
706 return retval;
707 }
708
709 static void fwnet_receive_packet(struct fw_card *card, struct fw_request *r,
710 int tcode, int destination, int source, int generation,
711 unsigned long long offset, void *payload, size_t length,
712 void *callback_data)
713 {
714 struct fwnet_device *dev = callback_data;
715 int rcode;
716
717 if (destination == IEEE1394_ALL_NODES) {
718 kfree(r);
719
720 return;
721 }
722
723 if (offset != dev->handler.offset)
724 rcode = RCODE_ADDRESS_ERROR;
725 else if (tcode != TCODE_WRITE_BLOCK_REQUEST)
726 rcode = RCODE_TYPE_ERROR;
727 else if (fwnet_incoming_packet(dev, payload, length,
728 source, generation, false) != 0) {
729 dev_err(&dev->netdev->dev, "incoming packet failure\n");
730 rcode = RCODE_CONFLICT_ERROR;
731 } else
732 rcode = RCODE_COMPLETE;
733
734 fw_send_response(card, r, rcode);
735 }
736
737 static int gasp_source_id(__be32 *p)
738 {
739 return be32_to_cpu(p[0]) >> 16;
740 }
741
742 static u32 gasp_specifier_id(__be32 *p)
743 {
744 return (be32_to_cpu(p[0]) & 0xffff) << 8 |
745 (be32_to_cpu(p[1]) & 0xff000000) >> 24;
746 }
747
748 static u32 gasp_version(__be32 *p)
749 {
750 return be32_to_cpu(p[1]) & 0xffffff;
751 }
752
753 static void fwnet_receive_broadcast(struct fw_iso_context *context,
754 u32 cycle, size_t header_length, void *header, void *data)
755 {
756 struct fwnet_device *dev;
757 struct fw_iso_packet packet;
758 __be16 *hdr_ptr;
759 __be32 *buf_ptr;
760 int retval;
761 u32 length;
762 unsigned long offset;
763 unsigned long flags;
764
765 dev = data;
766 hdr_ptr = header;
767 length = be16_to_cpup(hdr_ptr);
768
769 spin_lock_irqsave(&dev->lock, flags);
770
771 offset = dev->rcv_buffer_size * dev->broadcast_rcv_next_ptr;
772 buf_ptr = dev->broadcast_rcv_buffer_ptrs[dev->broadcast_rcv_next_ptr++];
773 if (dev->broadcast_rcv_next_ptr == dev->num_broadcast_rcv_ptrs)
774 dev->broadcast_rcv_next_ptr = 0;
775
776 spin_unlock_irqrestore(&dev->lock, flags);
777
778 if (length > IEEE1394_GASP_HDR_SIZE &&
779 gasp_specifier_id(buf_ptr) == IANA_SPECIFIER_ID &&
780 (gasp_version(buf_ptr) == RFC2734_SW_VERSION
781 #if IS_ENABLED(CONFIG_IPV6)
782 || gasp_version(buf_ptr) == RFC3146_SW_VERSION
783 #endif
784 ))
785 fwnet_incoming_packet(dev, buf_ptr + 2,
786 length - IEEE1394_GASP_HDR_SIZE,
787 gasp_source_id(buf_ptr),
788 context->card->generation, true);
789
790 packet.payload_length = dev->rcv_buffer_size;
791 packet.interrupt = 1;
792 packet.skip = 0;
793 packet.tag = 3;
794 packet.sy = 0;
795 packet.header_length = IEEE1394_GASP_HDR_SIZE;
796
797 spin_lock_irqsave(&dev->lock, flags);
798
799 retval = fw_iso_context_queue(dev->broadcast_rcv_context, &packet,
800 &dev->broadcast_rcv_buffer, offset);
801
802 spin_unlock_irqrestore(&dev->lock, flags);
803
804 if (retval >= 0)
805 fw_iso_context_queue_flush(dev->broadcast_rcv_context);
806 else
807 dev_err(&dev->netdev->dev, "requeue failed\n");
808 }
809
810 static struct kmem_cache *fwnet_packet_task_cache;
811
812 static void fwnet_free_ptask(struct fwnet_packet_task *ptask)
813 {
814 dev_kfree_skb_any(ptask->skb);
815 kmem_cache_free(fwnet_packet_task_cache, ptask);
816 }
817
818 /* Caller must hold dev->lock. */
819 static void dec_queued_datagrams(struct fwnet_device *dev)
820 {
821 if (--dev->queued_datagrams == FWNET_MIN_QUEUED_DATAGRAMS)
822 netif_wake_queue(dev->netdev);
823 }
824
825 static int fwnet_send_packet(struct fwnet_packet_task *ptask);
826
827 static void fwnet_transmit_packet_done(struct fwnet_packet_task *ptask)
828 {
829 struct fwnet_device *dev = ptask->dev;
830 struct sk_buff *skb = ptask->skb;
831 unsigned long flags;
832 bool free;
833
834 spin_lock_irqsave(&dev->lock, flags);
835
836 ptask->outstanding_pkts--;
837
838 /* Check whether we or the networking TX soft-IRQ is last user. */
839 free = (ptask->outstanding_pkts == 0 && ptask->enqueued);
840 if (free)
841 dec_queued_datagrams(dev);
842
843 if (ptask->outstanding_pkts == 0) {
844 dev->netdev->stats.tx_packets++;
845 dev->netdev->stats.tx_bytes += skb->len;
846 }
847
848 spin_unlock_irqrestore(&dev->lock, flags);
849
850 if (ptask->outstanding_pkts > 0) {
851 u16 dg_size;
852 u16 fg_off;
853 u16 datagram_label;
854 u16 lf;
855
856 /* Update the ptask to point to the next fragment and send it */
857 lf = fwnet_get_hdr_lf(&ptask->hdr);
858 switch (lf) {
859 case RFC2374_HDR_LASTFRAG:
860 case RFC2374_HDR_UNFRAG:
861 default:
862 dev_err(&dev->netdev->dev,
863 "outstanding packet %x lf %x, header %x,%x\n",
864 ptask->outstanding_pkts, lf, ptask->hdr.w0,
865 ptask->hdr.w1);
866 BUG();
867
868 case RFC2374_HDR_FIRSTFRAG:
869 /* Set frag type here for future interior fragments */
870 dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
871 fg_off = ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
872 datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
873 break;
874
875 case RFC2374_HDR_INTFRAG:
876 dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
877 fg_off = fwnet_get_hdr_fg_off(&ptask->hdr)
878 + ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
879 datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
880 break;
881 }
882
883 if (ptask->dest_node == IEEE1394_ALL_NODES) {
884 skb_pull(skb,
885 ptask->max_payload + IEEE1394_GASP_HDR_SIZE);
886 } else {
887 skb_pull(skb, ptask->max_payload);
888 }
889 if (ptask->outstanding_pkts > 1) {
890 fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_INTFRAG,
891 dg_size, fg_off, datagram_label);
892 } else {
893 fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_LASTFRAG,
894 dg_size, fg_off, datagram_label);
895 ptask->max_payload = skb->len + RFC2374_FRAG_HDR_SIZE;
896 }
897 fwnet_send_packet(ptask);
898 }
899
900 if (free)
901 fwnet_free_ptask(ptask);
902 }
903
904 static void fwnet_transmit_packet_failed(struct fwnet_packet_task *ptask)
905 {
906 struct fwnet_device *dev = ptask->dev;
907 unsigned long flags;
908 bool free;
909
910 spin_lock_irqsave(&dev->lock, flags);
911
912 /* One fragment failed; don't try to send remaining fragments. */
913 ptask->outstanding_pkts = 0;
914
915 /* Check whether we or the networking TX soft-IRQ is last user. */
916 free = ptask->enqueued;
917 if (free)
918 dec_queued_datagrams(dev);
919
920 dev->netdev->stats.tx_dropped++;
921 dev->netdev->stats.tx_errors++;
922
923 spin_unlock_irqrestore(&dev->lock, flags);
924
925 if (free)
926 fwnet_free_ptask(ptask);
927 }
928
929 static void fwnet_write_complete(struct fw_card *card, int rcode,
930 void *payload, size_t length, void *data)
931 {
932 struct fwnet_packet_task *ptask = data;
933 static unsigned long j;
934 static int last_rcode, errors_skipped;
935
936 if (rcode == RCODE_COMPLETE) {
937 fwnet_transmit_packet_done(ptask);
938 } else {
939 if (printk_timed_ratelimit(&j, 1000) || rcode != last_rcode) {
940 dev_err(&ptask->dev->netdev->dev,
941 "fwnet_write_complete failed: %x (skipped %d)\n",
942 rcode, errors_skipped);
943
944 errors_skipped = 0;
945 last_rcode = rcode;
946 } else {
947 errors_skipped++;
948 }
949 fwnet_transmit_packet_failed(ptask);
950 }
951 }
952
953 static int fwnet_send_packet(struct fwnet_packet_task *ptask)
954 {
955 struct fwnet_device *dev;
956 unsigned tx_len;
957 struct rfc2734_header *bufhdr;
958 unsigned long flags;
959 bool free;
960
961 dev = ptask->dev;
962 tx_len = ptask->max_payload;
963 switch (fwnet_get_hdr_lf(&ptask->hdr)) {
964 case RFC2374_HDR_UNFRAG:
965 bufhdr = skb_push(ptask->skb, RFC2374_UNFRAG_HDR_SIZE);
966 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
967 break;
968
969 case RFC2374_HDR_FIRSTFRAG:
970 case RFC2374_HDR_INTFRAG:
971 case RFC2374_HDR_LASTFRAG:
972 bufhdr = skb_push(ptask->skb, RFC2374_FRAG_HDR_SIZE);
973 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
974 put_unaligned_be32(ptask->hdr.w1, &bufhdr->w1);
975 break;
976
977 default:
978 BUG();
979 }
980 if (ptask->dest_node == IEEE1394_ALL_NODES) {
981 u8 *p;
982 int generation;
983 int node_id;
984 unsigned int sw_version;
985
986 /* ptask->generation may not have been set yet */
987 generation = dev->card->generation;
988 smp_rmb();
989 node_id = dev->card->node_id;
990
991 switch (ptask->skb->protocol) {
992 default:
993 sw_version = RFC2734_SW_VERSION;
994 break;
995 #if IS_ENABLED(CONFIG_IPV6)
996 case htons(ETH_P_IPV6):
997 sw_version = RFC3146_SW_VERSION;
998 #endif
999 }
1000
1001 p = skb_push(ptask->skb, IEEE1394_GASP_HDR_SIZE);
1002 put_unaligned_be32(node_id << 16 | IANA_SPECIFIER_ID >> 8, p);
1003 put_unaligned_be32((IANA_SPECIFIER_ID & 0xff) << 24
1004 | sw_version, &p[4]);
1005
1006 /* We should not transmit if broadcast_channel.valid == 0. */
1007 fw_send_request(dev->card, &ptask->transaction,
1008 TCODE_STREAM_DATA,
1009 fw_stream_packet_destination_id(3,
1010 IEEE1394_BROADCAST_CHANNEL, 0),
1011 generation, SCODE_100, 0ULL, ptask->skb->data,
1012 tx_len + 8, fwnet_write_complete, ptask);
1013
1014 spin_lock_irqsave(&dev->lock, flags);
1015
1016 /* If the AT tasklet already ran, we may be last user. */
1017 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1018 if (!free)
1019 ptask->enqueued = true;
1020 else
1021 dec_queued_datagrams(dev);
1022
1023 spin_unlock_irqrestore(&dev->lock, flags);
1024
1025 goto out;
1026 }
1027
1028 fw_send_request(dev->card, &ptask->transaction,
1029 TCODE_WRITE_BLOCK_REQUEST, ptask->dest_node,
1030 ptask->generation, ptask->speed, ptask->fifo_addr,
1031 ptask->skb->data, tx_len, fwnet_write_complete, ptask);
1032
1033 spin_lock_irqsave(&dev->lock, flags);
1034
1035 /* If the AT tasklet already ran, we may be last user. */
1036 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1037 if (!free)
1038 ptask->enqueued = true;
1039 else
1040 dec_queued_datagrams(dev);
1041
1042 spin_unlock_irqrestore(&dev->lock, flags);
1043
1044 netif_trans_update(dev->netdev);
1045 out:
1046 if (free)
1047 fwnet_free_ptask(ptask);
1048
1049 return 0;
1050 }
1051
1052 static void fwnet_fifo_stop(struct fwnet_device *dev)
1053 {
1054 if (dev->local_fifo == FWNET_NO_FIFO_ADDR)
1055 return;
1056
1057 fw_core_remove_address_handler(&dev->handler);
1058 dev->local_fifo = FWNET_NO_FIFO_ADDR;
1059 }
1060
1061 static int fwnet_fifo_start(struct fwnet_device *dev)
1062 {
1063 int retval;
1064
1065 if (dev->local_fifo != FWNET_NO_FIFO_ADDR)
1066 return 0;
1067
1068 dev->handler.length = 4096;
1069 dev->handler.address_callback = fwnet_receive_packet;
1070 dev->handler.callback_data = dev;
1071
1072 retval = fw_core_add_address_handler(&dev->handler,
1073 &fw_high_memory_region);
1074 if (retval < 0)
1075 return retval;
1076
1077 dev->local_fifo = dev->handler.offset;
1078
1079 return 0;
1080 }
1081
1082 static void __fwnet_broadcast_stop(struct fwnet_device *dev)
1083 {
1084 unsigned u;
1085
1086 if (dev->broadcast_state != FWNET_BROADCAST_ERROR) {
1087 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++)
1088 kunmap(dev->broadcast_rcv_buffer.pages[u]);
1089 fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer, dev->card);
1090 }
1091 if (dev->broadcast_rcv_context) {
1092 fw_iso_context_destroy(dev->broadcast_rcv_context);
1093 dev->broadcast_rcv_context = NULL;
1094 }
1095 kfree(dev->broadcast_rcv_buffer_ptrs);
1096 dev->broadcast_rcv_buffer_ptrs = NULL;
1097 dev->broadcast_state = FWNET_BROADCAST_ERROR;
1098 }
1099
1100 static void fwnet_broadcast_stop(struct fwnet_device *dev)
1101 {
1102 if (dev->broadcast_state == FWNET_BROADCAST_ERROR)
1103 return;
1104 fw_iso_context_stop(dev->broadcast_rcv_context);
1105 __fwnet_broadcast_stop(dev);
1106 }
1107
1108 static int fwnet_broadcast_start(struct fwnet_device *dev)
1109 {
1110 struct fw_iso_context *context;
1111 int retval;
1112 unsigned num_packets;
1113 unsigned max_receive;
1114 struct fw_iso_packet packet;
1115 unsigned long offset;
1116 void **ptrptr;
1117 unsigned u;
1118
1119 if (dev->broadcast_state != FWNET_BROADCAST_ERROR)
1120 return 0;
1121
1122 max_receive = 1U << (dev->card->max_receive + 1);
1123 num_packets = (FWNET_ISO_PAGE_COUNT * PAGE_SIZE) / max_receive;
1124
1125 ptrptr = kmalloc_array(num_packets, sizeof(void *), GFP_KERNEL);
1126 if (!ptrptr) {
1127 retval = -ENOMEM;
1128 goto failed;
1129 }
1130 dev->broadcast_rcv_buffer_ptrs = ptrptr;
1131
1132 context = fw_iso_context_create(dev->card, FW_ISO_CONTEXT_RECEIVE,
1133 IEEE1394_BROADCAST_CHANNEL,
1134 dev->card->link_speed, 8,
1135 fwnet_receive_broadcast, dev);
1136 if (IS_ERR(context)) {
1137 retval = PTR_ERR(context);
1138 goto failed;
1139 }
1140
1141 retval = fw_iso_buffer_init(&dev->broadcast_rcv_buffer, dev->card,
1142 FWNET_ISO_PAGE_COUNT, DMA_FROM_DEVICE);
1143 if (retval < 0)
1144 goto failed;
1145
1146 dev->broadcast_state = FWNET_BROADCAST_STOPPED;
1147
1148 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++) {
1149 void *ptr;
1150 unsigned v;
1151
1152 ptr = kmap(dev->broadcast_rcv_buffer.pages[u]);
1153 for (v = 0; v < num_packets / FWNET_ISO_PAGE_COUNT; v++)
1154 *ptrptr++ = (void *) ((char *)ptr + v * max_receive);
1155 }
1156 dev->broadcast_rcv_context = context;
1157
1158 packet.payload_length = max_receive;
1159 packet.interrupt = 1;
1160 packet.skip = 0;
1161 packet.tag = 3;
1162 packet.sy = 0;
1163 packet.header_length = IEEE1394_GASP_HDR_SIZE;
1164 offset = 0;
1165
1166 for (u = 0; u < num_packets; u++) {
1167 retval = fw_iso_context_queue(context, &packet,
1168 &dev->broadcast_rcv_buffer, offset);
1169 if (retval < 0)
1170 goto failed;
1171
1172 offset += max_receive;
1173 }
1174 dev->num_broadcast_rcv_ptrs = num_packets;
1175 dev->rcv_buffer_size = max_receive;
1176 dev->broadcast_rcv_next_ptr = 0U;
1177 retval = fw_iso_context_start(context, -1, 0,
1178 FW_ISO_CONTEXT_MATCH_ALL_TAGS); /* ??? sync */
1179 if (retval < 0)
1180 goto failed;
1181
1182 /* FIXME: adjust it according to the min. speed of all known peers? */
1183 dev->broadcast_xmt_max_payload = IEEE1394_MAX_PAYLOAD_S100
1184 - IEEE1394_GASP_HDR_SIZE - RFC2374_UNFRAG_HDR_SIZE;
1185 dev->broadcast_state = FWNET_BROADCAST_RUNNING;
1186
1187 return 0;
1188
1189 failed:
1190 __fwnet_broadcast_stop(dev);
1191 return retval;
1192 }
1193
1194 static void set_carrier_state(struct fwnet_device *dev)
1195 {
1196 if (dev->peer_count > 1)
1197 netif_carrier_on(dev->netdev);
1198 else
1199 netif_carrier_off(dev->netdev);
1200 }
1201
1202 /* ifup */
1203 static int fwnet_open(struct net_device *net)
1204 {
1205 struct fwnet_device *dev = netdev_priv(net);
1206 int ret;
1207
1208 ret = fwnet_broadcast_start(dev);
1209 if (ret)
1210 return ret;
1211
1212 netif_start_queue(net);
1213
1214 spin_lock_irq(&dev->lock);
1215 set_carrier_state(dev);
1216 spin_unlock_irq(&dev->lock);
1217
1218 return 0;
1219 }
1220
1221 /* ifdown */
1222 static int fwnet_stop(struct net_device *net)
1223 {
1224 struct fwnet_device *dev = netdev_priv(net);
1225
1226 netif_stop_queue(net);
1227 fwnet_broadcast_stop(dev);
1228
1229 return 0;
1230 }
1231
1232 static netdev_tx_t fwnet_tx(struct sk_buff *skb, struct net_device *net)
1233 {
1234 struct fwnet_header hdr_buf;
1235 struct fwnet_device *dev = netdev_priv(net);
1236 __be16 proto;
1237 u16 dest_node;
1238 unsigned max_payload;
1239 u16 dg_size;
1240 u16 *datagram_label_ptr;
1241 struct fwnet_packet_task *ptask;
1242 struct fwnet_peer *peer;
1243 unsigned long flags;
1244
1245 spin_lock_irqsave(&dev->lock, flags);
1246
1247 /* Can this happen? */
1248 if (netif_queue_stopped(dev->netdev)) {
1249 spin_unlock_irqrestore(&dev->lock, flags);
1250
1251 return NETDEV_TX_BUSY;
1252 }
1253
1254 ptask = kmem_cache_alloc(fwnet_packet_task_cache, GFP_ATOMIC);
1255 if (ptask == NULL)
1256 goto fail;
1257
1258 skb = skb_share_check(skb, GFP_ATOMIC);
1259 if (!skb)
1260 goto fail;
1261
1262 /*
1263 * Make a copy of the driver-specific header.
1264 * We might need to rebuild the header on tx failure.
1265 */
1266 memcpy(&hdr_buf, skb->data, sizeof(hdr_buf));
1267 proto = hdr_buf.h_proto;
1268
1269 switch (proto) {
1270 case htons(ETH_P_ARP):
1271 case htons(ETH_P_IP):
1272 #if IS_ENABLED(CONFIG_IPV6)
1273 case htons(ETH_P_IPV6):
1274 #endif
1275 break;
1276 default:
1277 goto fail;
1278 }
1279
1280 skb_pull(skb, sizeof(hdr_buf));
1281 dg_size = skb->len;
1282
1283 /*
1284 * Set the transmission type for the packet. ARP packets and IP
1285 * broadcast packets are sent via GASP.
1286 */
1287 if (fwnet_hwaddr_is_multicast(hdr_buf.h_dest)) {
1288 max_payload = dev->broadcast_xmt_max_payload;
1289 datagram_label_ptr = &dev->broadcast_xmt_datagramlabel;
1290
1291 ptask->fifo_addr = FWNET_NO_FIFO_ADDR;
1292 ptask->generation = 0;
1293 ptask->dest_node = IEEE1394_ALL_NODES;
1294 ptask->speed = SCODE_100;
1295 } else {
1296 union fwnet_hwaddr *ha = (union fwnet_hwaddr *)hdr_buf.h_dest;
1297 __be64 guid = get_unaligned(&ha->uc.uniq_id);
1298 u8 generation;
1299
1300 peer = fwnet_peer_find_by_guid(dev, be64_to_cpu(guid));
1301 if (!peer)
1302 goto fail;
1303
1304 generation = peer->generation;
1305 dest_node = peer->node_id;
1306 max_payload = peer->max_payload;
1307 datagram_label_ptr = &peer->datagram_label;
1308
1309 ptask->fifo_addr = fwnet_hwaddr_fifo(ha);
1310 ptask->generation = generation;
1311 ptask->dest_node = dest_node;
1312 ptask->speed = peer->speed;
1313 }
1314
1315 ptask->hdr.w0 = 0;
1316 ptask->hdr.w1 = 0;
1317 ptask->skb = skb;
1318 ptask->dev = dev;
1319
1320 /* Does it all fit in one packet? */
1321 if (dg_size <= max_payload) {
1322 fwnet_make_uf_hdr(&ptask->hdr, ntohs(proto));
1323 ptask->outstanding_pkts = 1;
1324 max_payload = dg_size + RFC2374_UNFRAG_HDR_SIZE;
1325 } else {
1326 u16 datagram_label;
1327
1328 max_payload -= RFC2374_FRAG_OVERHEAD;
1329 datagram_label = (*datagram_label_ptr)++;
1330 fwnet_make_ff_hdr(&ptask->hdr, ntohs(proto), dg_size,
1331 datagram_label);
1332 ptask->outstanding_pkts = DIV_ROUND_UP(dg_size, max_payload);
1333 max_payload += RFC2374_FRAG_HDR_SIZE;
1334 }
1335
1336 if (++dev->queued_datagrams == FWNET_MAX_QUEUED_DATAGRAMS)
1337 netif_stop_queue(dev->netdev);
1338
1339 spin_unlock_irqrestore(&dev->lock, flags);
1340
1341 ptask->max_payload = max_payload;
1342 ptask->enqueued = 0;
1343
1344 fwnet_send_packet(ptask);
1345
1346 return NETDEV_TX_OK;
1347
1348 fail:
1349 spin_unlock_irqrestore(&dev->lock, flags);
1350
1351 if (ptask)
1352 kmem_cache_free(fwnet_packet_task_cache, ptask);
1353
1354 if (skb != NULL)
1355 dev_kfree_skb(skb);
1356
1357 net->stats.tx_dropped++;
1358 net->stats.tx_errors++;
1359
1360 /*
1361 * FIXME: According to a patch from 2003-02-26, "returning non-zero
1362 * causes serious problems" here, allegedly. Before that patch,
1363 * -ERRNO was returned which is not appropriate under Linux 2.6.
1364 * Perhaps more needs to be done? Stop the queue in serious
1365 * conditions and restart it elsewhere?
1366 */
1367 return NETDEV_TX_OK;
1368 }
1369
1370 static const struct ethtool_ops fwnet_ethtool_ops = {
1371 .get_link = ethtool_op_get_link,
1372 };
1373
1374 static const struct net_device_ops fwnet_netdev_ops = {
1375 .ndo_open = fwnet_open,
1376 .ndo_stop = fwnet_stop,
1377 .ndo_start_xmit = fwnet_tx,
1378 };
1379
1380 static void fwnet_init_dev(struct net_device *net)
1381 {
1382 net->header_ops = &fwnet_header_ops;
1383 net->netdev_ops = &fwnet_netdev_ops;
1384 net->watchdog_timeo = 2 * HZ;
1385 net->flags = IFF_BROADCAST | IFF_MULTICAST;
1386 net->features = NETIF_F_HIGHDMA;
1387 net->addr_len = FWNET_ALEN;
1388 net->hard_header_len = FWNET_HLEN;
1389 net->type = ARPHRD_IEEE1394;
1390 net->tx_queue_len = FWNET_TX_QUEUE_LEN;
1391 net->ethtool_ops = &fwnet_ethtool_ops;
1392 }
1393
1394 /* caller must hold fwnet_device_mutex */
1395 static struct fwnet_device *fwnet_dev_find(struct fw_card *card)
1396 {
1397 struct fwnet_device *dev;
1398
1399 list_for_each_entry(dev, &fwnet_device_list, dev_link)
1400 if (dev->card == card)
1401 return dev;
1402
1403 return NULL;
1404 }
1405
1406 static int fwnet_add_peer(struct fwnet_device *dev,
1407 struct fw_unit *unit, struct fw_device *device)
1408 {
1409 struct fwnet_peer *peer;
1410
1411 peer = kmalloc(sizeof(*peer), GFP_KERNEL);
1412 if (!peer)
1413 return -ENOMEM;
1414
1415 dev_set_drvdata(&unit->device, peer);
1416
1417 peer->dev = dev;
1418 peer->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4];
1419 INIT_LIST_HEAD(&peer->pd_list);
1420 peer->pdg_size = 0;
1421 peer->datagram_label = 0;
1422 peer->speed = device->max_speed;
1423 peer->max_payload = fwnet_max_payload(device->max_rec, peer->speed);
1424
1425 peer->generation = device->generation;
1426 smp_rmb();
1427 peer->node_id = device->node_id;
1428
1429 spin_lock_irq(&dev->lock);
1430 list_add_tail(&peer->peer_link, &dev->peer_list);
1431 dev->peer_count++;
1432 set_carrier_state(dev);
1433 spin_unlock_irq(&dev->lock);
1434
1435 return 0;
1436 }
1437
1438 static int fwnet_probe(struct fw_unit *unit,
1439 const struct ieee1394_device_id *id)
1440 {
1441 struct fw_device *device = fw_parent_device(unit);
1442 struct fw_card *card = device->card;
1443 struct net_device *net;
1444 bool allocated_netdev = false;
1445 struct fwnet_device *dev;
1446 int ret;
1447 union fwnet_hwaddr *ha;
1448
1449 mutex_lock(&fwnet_device_mutex);
1450
1451 dev = fwnet_dev_find(card);
1452 if (dev) {
1453 net = dev->netdev;
1454 goto have_dev;
1455 }
1456
1457 net = alloc_netdev(sizeof(*dev), "firewire%d", NET_NAME_UNKNOWN,
1458 fwnet_init_dev);
1459 if (net == NULL) {
1460 mutex_unlock(&fwnet_device_mutex);
1461 return -ENOMEM;
1462 }
1463
1464 allocated_netdev = true;
1465 SET_NETDEV_DEV(net, card->device);
1466 dev = netdev_priv(net);
1467
1468 spin_lock_init(&dev->lock);
1469 dev->broadcast_state = FWNET_BROADCAST_ERROR;
1470 dev->broadcast_rcv_context = NULL;
1471 dev->broadcast_xmt_max_payload = 0;
1472 dev->broadcast_xmt_datagramlabel = 0;
1473 dev->local_fifo = FWNET_NO_FIFO_ADDR;
1474 dev->queued_datagrams = 0;
1475 INIT_LIST_HEAD(&dev->peer_list);
1476 dev->card = card;
1477 dev->netdev = net;
1478
1479 ret = fwnet_fifo_start(dev);
1480 if (ret < 0)
1481 goto out;
1482 dev->local_fifo = dev->handler.offset;
1483
1484 /*
1485 * default MTU: RFC 2734 cl. 4, RFC 3146 cl. 4
1486 * maximum MTU: RFC 2734 cl. 4.2, fragment encapsulation header's
1487 * maximum possible datagram_size + 1 = 0xfff + 1
1488 */
1489 net->mtu = 1500U;
1490 net->min_mtu = ETH_MIN_MTU;
1491 net->max_mtu = 4096U;
1492
1493 /* Set our hardware address while we're at it */
1494 ha = (union fwnet_hwaddr *)net->dev_addr;
1495 put_unaligned_be64(card->guid, &ha->uc.uniq_id);
1496 ha->uc.max_rec = dev->card->max_receive;
1497 ha->uc.sspd = dev->card->link_speed;
1498 put_unaligned_be16(dev->local_fifo >> 32, &ha->uc.fifo_hi);
1499 put_unaligned_be32(dev->local_fifo & 0xffffffff, &ha->uc.fifo_lo);
1500
1501 memset(net->broadcast, -1, net->addr_len);
1502
1503 ret = register_netdev(net);
1504 if (ret)
1505 goto out;
1506
1507 list_add_tail(&dev->dev_link, &fwnet_device_list);
1508 dev_notice(&net->dev, "IP over IEEE 1394 on card %s\n",
1509 dev_name(card->device));
1510 have_dev:
1511 ret = fwnet_add_peer(dev, unit, device);
1512 if (ret && allocated_netdev) {
1513 unregister_netdev(net);
1514 list_del(&dev->dev_link);
1515 out:
1516 fwnet_fifo_stop(dev);
1517 free_netdev(net);
1518 }
1519
1520 mutex_unlock(&fwnet_device_mutex);
1521
1522 return ret;
1523 }
1524
1525 /*
1526 * FIXME abort partially sent fragmented datagrams,
1527 * discard partially received fragmented datagrams
1528 */
1529 static void fwnet_update(struct fw_unit *unit)
1530 {
1531 struct fw_device *device = fw_parent_device(unit);
1532 struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1533 int generation;
1534
1535 generation = device->generation;
1536
1537 spin_lock_irq(&peer->dev->lock);
1538 peer->node_id = device->node_id;
1539 peer->generation = generation;
1540 spin_unlock_irq(&peer->dev->lock);
1541 }
1542
1543 static void fwnet_remove_peer(struct fwnet_peer *peer, struct fwnet_device *dev)
1544 {
1545 struct fwnet_partial_datagram *pd, *pd_next;
1546
1547 spin_lock_irq(&dev->lock);
1548 list_del(&peer->peer_link);
1549 dev->peer_count--;
1550 set_carrier_state(dev);
1551 spin_unlock_irq(&dev->lock);
1552
1553 list_for_each_entry_safe(pd, pd_next, &peer->pd_list, pd_link)
1554 fwnet_pd_delete(pd);
1555
1556 kfree(peer);
1557 }
1558
1559 static void fwnet_remove(struct fw_unit *unit)
1560 {
1561 struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1562 struct fwnet_device *dev = peer->dev;
1563 struct net_device *net;
1564 int i;
1565
1566 mutex_lock(&fwnet_device_mutex);
1567
1568 net = dev->netdev;
1569
1570 fwnet_remove_peer(peer, dev);
1571
1572 if (list_empty(&dev->peer_list)) {
1573 unregister_netdev(net);
1574
1575 fwnet_fifo_stop(dev);
1576
1577 for (i = 0; dev->queued_datagrams && i < 5; i++)
1578 ssleep(1);
1579 WARN_ON(dev->queued_datagrams);
1580 list_del(&dev->dev_link);
1581
1582 free_netdev(net);
1583 }
1584
1585 mutex_unlock(&fwnet_device_mutex);
1586 }
1587
1588 static const struct ieee1394_device_id fwnet_id_table[] = {
1589 {
1590 .match_flags = IEEE1394_MATCH_SPECIFIER_ID |
1591 IEEE1394_MATCH_VERSION,
1592 .specifier_id = IANA_SPECIFIER_ID,
1593 .version = RFC2734_SW_VERSION,
1594 },
1595 #if IS_ENABLED(CONFIG_IPV6)
1596 {
1597 .match_flags = IEEE1394_MATCH_SPECIFIER_ID |
1598 IEEE1394_MATCH_VERSION,
1599 .specifier_id = IANA_SPECIFIER_ID,
1600 .version = RFC3146_SW_VERSION,
1601 },
1602 #endif
1603 { }
1604 };
1605
1606 static struct fw_driver fwnet_driver = {
1607 .driver = {
1608 .owner = THIS_MODULE,
1609 .name = KBUILD_MODNAME,
1610 .bus = &fw_bus_type,
1611 },
1612 .probe = fwnet_probe,
1613 .update = fwnet_update,
1614 .remove = fwnet_remove,
1615 .id_table = fwnet_id_table,
1616 };
1617
1618 static const u32 rfc2374_unit_directory_data[] = {
1619 0x00040000, /* directory_length */
1620 0x1200005e, /* unit_specifier_id: IANA */
1621 0x81000003, /* textual descriptor offset */
1622 0x13000001, /* unit_sw_version: RFC 2734 */
1623 0x81000005, /* textual descriptor offset */
1624 0x00030000, /* descriptor_length */
1625 0x00000000, /* text */
1626 0x00000000, /* minimal ASCII, en */
1627 0x49414e41, /* I A N A */
1628 0x00030000, /* descriptor_length */
1629 0x00000000, /* text */
1630 0x00000000, /* minimal ASCII, en */
1631 0x49507634, /* I P v 4 */
1632 };
1633
1634 static struct fw_descriptor rfc2374_unit_directory = {
1635 .length = ARRAY_SIZE(rfc2374_unit_directory_data),
1636 .key = (CSR_DIRECTORY | CSR_UNIT) << 24,
1637 .data = rfc2374_unit_directory_data
1638 };
1639
1640 #if IS_ENABLED(CONFIG_IPV6)
1641 static const u32 rfc3146_unit_directory_data[] = {
1642 0x00040000, /* directory_length */
1643 0x1200005e, /* unit_specifier_id: IANA */
1644 0x81000003, /* textual descriptor offset */
1645 0x13000002, /* unit_sw_version: RFC 3146 */
1646 0x81000005, /* textual descriptor offset */
1647 0x00030000, /* descriptor_length */
1648 0x00000000, /* text */
1649 0x00000000, /* minimal ASCII, en */
1650 0x49414e41, /* I A N A */
1651 0x00030000, /* descriptor_length */
1652 0x00000000, /* text */
1653 0x00000000, /* minimal ASCII, en */
1654 0x49507636, /* I P v 6 */
1655 };
1656
1657 static struct fw_descriptor rfc3146_unit_directory = {
1658 .length = ARRAY_SIZE(rfc3146_unit_directory_data),
1659 .key = (CSR_DIRECTORY | CSR_UNIT) << 24,
1660 .data = rfc3146_unit_directory_data
1661 };
1662 #endif
1663
1664 static int __init fwnet_init(void)
1665 {
1666 int err;
1667
1668 err = fw_core_add_descriptor(&rfc2374_unit_directory);
1669 if (err)
1670 return err;
1671
1672 #if IS_ENABLED(CONFIG_IPV6)
1673 err = fw_core_add_descriptor(&rfc3146_unit_directory);
1674 if (err)
1675 goto out;
1676 #endif
1677
1678 fwnet_packet_task_cache = kmem_cache_create("packet_task",
1679 sizeof(struct fwnet_packet_task), 0, 0, NULL);
1680 if (!fwnet_packet_task_cache) {
1681 err = -ENOMEM;
1682 goto out2;
1683 }
1684
1685 err = driver_register(&fwnet_driver.driver);
1686 if (!err)
1687 return 0;
1688
1689 kmem_cache_destroy(fwnet_packet_task_cache);
1690 out2:
1691 #if IS_ENABLED(CONFIG_IPV6)
1692 fw_core_remove_descriptor(&rfc3146_unit_directory);
1693 out:
1694 #endif
1695 fw_core_remove_descriptor(&rfc2374_unit_directory);
1696
1697 return err;
1698 }
1699 module_init(fwnet_init);
1700
1701 static void __exit fwnet_cleanup(void)
1702 {
1703 driver_unregister(&fwnet_driver.driver);
1704 kmem_cache_destroy(fwnet_packet_task_cache);
1705 #if IS_ENABLED(CONFIG_IPV6)
1706 fw_core_remove_descriptor(&rfc3146_unit_directory);
1707 #endif
1708 fw_core_remove_descriptor(&rfc2374_unit_directory);
1709 }
1710 module_exit(fwnet_cleanup);
1711
1712 MODULE_AUTHOR("Jay Fenlason <fenlason@redhat.com>");
1713 MODULE_DESCRIPTION("IP over IEEE1394 as per RFC 2734/3146");
1714 MODULE_LICENSE("GPL");
1715 MODULE_DEVICE_TABLE(ieee1394, fwnet_id_table);
Linux with added FPC-III support