Version:  2.0.40 2.2.26 2.4.37 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2

Linux/drivers/firewire/net.c

  1 /*
  2  * IPv4 over IEEE 1394, per RFC 2734
  3  * IPv6 over IEEE 1394, per RFC 3146
  4  *
  5  * Copyright (C) 2009 Jay Fenlason <fenlason@redhat.com>
  6  *
  7  * based on eth1394 by Ben Collins et al
  8  */
  9 
 10 #include <linux/bug.h>
 11 #include <linux/compiler.h>
 12 #include <linux/delay.h>
 13 #include <linux/device.h>
 14 #include <linux/ethtool.h>
 15 #include <linux/firewire.h>
 16 #include <linux/firewire-constants.h>
 17 #include <linux/highmem.h>
 18 #include <linux/in.h>
 19 #include <linux/ip.h>
 20 #include <linux/jiffies.h>
 21 #include <linux/mod_devicetable.h>
 22 #include <linux/module.h>
 23 #include <linux/moduleparam.h>
 24 #include <linux/mutex.h>
 25 #include <linux/netdevice.h>
 26 #include <linux/skbuff.h>
 27 #include <linux/slab.h>
 28 #include <linux/spinlock.h>
 29 
 30 #include <asm/unaligned.h>
 31 #include <net/arp.h>
 32 #include <net/firewire.h>
 33 
 34 /* rx limits */
 35 #define FWNET_MAX_FRAGMENTS             30 /* arbitrary, > TX queue depth */
 36 #define FWNET_ISO_PAGE_COUNT            (PAGE_SIZE < 16*1024 ? 4 : 2)
 37 
 38 /* tx limits */
 39 #define FWNET_MAX_QUEUED_DATAGRAMS      20 /* < 64 = number of tlabels */
 40 #define FWNET_MIN_QUEUED_DATAGRAMS      10 /* should keep AT DMA busy enough */
 41 #define FWNET_TX_QUEUE_LEN              FWNET_MAX_QUEUED_DATAGRAMS /* ? */
 42 
 43 #define IEEE1394_BROADCAST_CHANNEL      31
 44 #define IEEE1394_ALL_NODES              (0xffc0 | 0x003f)
 45 #define IEEE1394_MAX_PAYLOAD_S100       512
 46 #define FWNET_NO_FIFO_ADDR              (~0ULL)
 47 
 48 #define IANA_SPECIFIER_ID               0x00005eU
 49 #define RFC2734_SW_VERSION              0x000001U
 50 #define RFC3146_SW_VERSION              0x000002U
 51 
 52 #define IEEE1394_GASP_HDR_SIZE  8
 53 
 54 #define RFC2374_UNFRAG_HDR_SIZE 4
 55 #define RFC2374_FRAG_HDR_SIZE   8
 56 #define RFC2374_FRAG_OVERHEAD   4
 57 
 58 #define RFC2374_HDR_UNFRAG      0       /* unfragmented         */
 59 #define RFC2374_HDR_FIRSTFRAG   1       /* first fragment       */
 60 #define RFC2374_HDR_LASTFRAG    2       /* last fragment        */
 61 #define RFC2374_HDR_INTFRAG     3       /* interior fragment    */
 62 
 63 static bool fwnet_hwaddr_is_multicast(u8 *ha)
 64 {
 65         return !!(*ha & 1);
 66 }
 67 
 68 /* IPv4 and IPv6 encapsulation header */
 69 struct rfc2734_header {
 70         u32 w0;
 71         u32 w1;
 72 };
 73 
 74 #define fwnet_get_hdr_lf(h)             (((h)->w0 & 0xc0000000) >> 30)
 75 #define fwnet_get_hdr_ether_type(h)     (((h)->w0 & 0x0000ffff))
 76 #define fwnet_get_hdr_dg_size(h)        (((h)->w0 & 0x0fff0000) >> 16)
 77 #define fwnet_get_hdr_fg_off(h)         (((h)->w0 & 0x00000fff))
 78 #define fwnet_get_hdr_dgl(h)            (((h)->w1 & 0xffff0000) >> 16)
 79 
 80 #define fwnet_set_hdr_lf(lf)            ((lf)  << 30)
 81 #define fwnet_set_hdr_ether_type(et)    (et)
 82 #define fwnet_set_hdr_dg_size(dgs)      ((dgs) << 16)
 83 #define fwnet_set_hdr_fg_off(fgo)       (fgo)
 84 
 85 #define fwnet_set_hdr_dgl(dgl)          ((dgl) << 16)
 86 
 87 static inline void fwnet_make_uf_hdr(struct rfc2734_header *hdr,
 88                 unsigned ether_type)
 89 {
 90         hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_UNFRAG)
 91                   | fwnet_set_hdr_ether_type(ether_type);
 92 }
 93 
 94 static inline void fwnet_make_ff_hdr(struct rfc2734_header *hdr,
 95                 unsigned ether_type, unsigned dg_size, unsigned dgl)
 96 {
 97         hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_FIRSTFRAG)
 98                   | fwnet_set_hdr_dg_size(dg_size)
 99                   | fwnet_set_hdr_ether_type(ether_type);
100         hdr->w1 = fwnet_set_hdr_dgl(dgl);
101 }
102 
103 static inline void fwnet_make_sf_hdr(struct rfc2734_header *hdr,
104                 unsigned lf, unsigned dg_size, unsigned fg_off, unsigned dgl)
105 {
106         hdr->w0 = fwnet_set_hdr_lf(lf)
107                   | fwnet_set_hdr_dg_size(dg_size)
108                   | fwnet_set_hdr_fg_off(fg_off);
109         hdr->w1 = fwnet_set_hdr_dgl(dgl);
110 }
111 
112 /* This list keeps track of what parts of the datagram have been filled in */
113 struct fwnet_fragment_info {
114         struct list_head fi_link;
115         u16 offset;
116         u16 len;
117 };
118 
119 struct fwnet_partial_datagram {
120         struct list_head pd_link;
121         struct list_head fi_list;
122         struct sk_buff *skb;
123         /* FIXME Why not use skb->data? */
124         char *pbuf;
125         u16 datagram_label;
126         u16 ether_type;
127         u16 datagram_size;
128 };
129 
130 static DEFINE_MUTEX(fwnet_device_mutex);
131 static LIST_HEAD(fwnet_device_list);
132 
133 struct fwnet_device {
134         struct list_head dev_link;
135         spinlock_t lock;
136         enum {
137                 FWNET_BROADCAST_ERROR,
138                 FWNET_BROADCAST_RUNNING,
139                 FWNET_BROADCAST_STOPPED,
140         } broadcast_state;
141         struct fw_iso_context *broadcast_rcv_context;
142         struct fw_iso_buffer broadcast_rcv_buffer;
143         void **broadcast_rcv_buffer_ptrs;
144         unsigned broadcast_rcv_next_ptr;
145         unsigned num_broadcast_rcv_ptrs;
146         unsigned rcv_buffer_size;
147         /*
148          * This value is the maximum unfragmented datagram size that can be
149          * sent by the hardware.  It already has the GASP overhead and the
150          * unfragmented datagram header overhead calculated into it.
151          */
152         unsigned broadcast_xmt_max_payload;
153         u16 broadcast_xmt_datagramlabel;
154 
155         /*
156          * The CSR address that remote nodes must send datagrams to for us to
157          * receive them.
158          */
159         struct fw_address_handler handler;
160         u64 local_fifo;
161 
162         /* Number of tx datagrams that have been queued but not yet acked */
163         int queued_datagrams;
164 
165         int peer_count;
166         struct list_head peer_list;
167         struct fw_card *card;
168         struct net_device *netdev;
169 };
170 
171 struct fwnet_peer {
172         struct list_head peer_link;
173         struct fwnet_device *dev;
174         u64 guid;
175 
176         /* guarded by dev->lock */
177         struct list_head pd_list; /* received partial datagrams */
178         unsigned pdg_size;        /* pd_list size */
179 
180         u16 datagram_label;       /* outgoing datagram label */
181         u16 max_payload;          /* includes RFC2374_FRAG_HDR_SIZE overhead */
182         int node_id;
183         int generation;
184         unsigned speed;
185 };
186 
187 /* This is our task struct. It's used for the packet complete callback.  */
188 struct fwnet_packet_task {
189         struct fw_transaction transaction;
190         struct rfc2734_header hdr;
191         struct sk_buff *skb;
192         struct fwnet_device *dev;
193 
194         int outstanding_pkts;
195         u64 fifo_addr;
196         u16 dest_node;
197         u16 max_payload;
198         u8 generation;
199         u8 speed;
200         u8 enqueued;
201 };
202 
203 /*
204  * Get fifo address embedded in hwaddr
205  */
206 static __u64 fwnet_hwaddr_fifo(union fwnet_hwaddr *ha)
207 {
208         return (u64)get_unaligned_be16(&ha->uc.fifo_hi) << 32
209                | get_unaligned_be32(&ha->uc.fifo_lo);
210 }
211 
212 /*
213  * saddr == NULL means use device source address.
214  * daddr == NULL means leave destination address (eg unresolved arp).
215  */
216 static int fwnet_header_create(struct sk_buff *skb, struct net_device *net,
217                         unsigned short type, const void *daddr,
218                         const void *saddr, unsigned len)
219 {
220         struct fwnet_header *h;
221 
222         h = (struct fwnet_header *)skb_push(skb, sizeof(*h));
223         put_unaligned_be16(type, &h->h_proto);
224 
225         if (net->flags & (IFF_LOOPBACK | IFF_NOARP)) {
226                 memset(h->h_dest, 0, net->addr_len);
227 
228                 return net->hard_header_len;
229         }
230 
231         if (daddr) {
232                 memcpy(h->h_dest, daddr, net->addr_len);
233 
234                 return net->hard_header_len;
235         }
236 
237         return -net->hard_header_len;
238 }
239 
240 static int fwnet_header_cache(const struct neighbour *neigh,
241                               struct hh_cache *hh, __be16 type)
242 {
243         struct net_device *net;
244         struct fwnet_header *h;
245 
246         if (type == cpu_to_be16(ETH_P_802_3))
247                 return -1;
248         net = neigh->dev;
249         h = (struct fwnet_header *)((u8 *)hh->hh_data + HH_DATA_OFF(sizeof(*h)));
250         h->h_proto = type;
251         memcpy(h->h_dest, neigh->ha, net->addr_len);
252         hh->hh_len = FWNET_HLEN;
253 
254         return 0;
255 }
256 
257 /* Called by Address Resolution module to notify changes in address. */
258 static void fwnet_header_cache_update(struct hh_cache *hh,
259                 const struct net_device *net, const unsigned char *haddr)
260 {
261         memcpy((u8 *)hh->hh_data + HH_DATA_OFF(FWNET_HLEN), haddr, net->addr_len);
262 }
263 
264 static int fwnet_header_parse(const struct sk_buff *skb, unsigned char *haddr)
265 {
266         memcpy(haddr, skb->dev->dev_addr, FWNET_ALEN);
267 
268         return FWNET_ALEN;
269 }
270 
271 static const struct header_ops fwnet_header_ops = {
272         .create         = fwnet_header_create,
273         .cache          = fwnet_header_cache,
274         .cache_update   = fwnet_header_cache_update,
275         .parse          = fwnet_header_parse,
276 };
277 
278 /* FIXME: is this correct for all cases? */
279 static bool fwnet_frag_overlap(struct fwnet_partial_datagram *pd,
280                                unsigned offset, unsigned len)
281 {
282         struct fwnet_fragment_info *fi;
283         unsigned end = offset + len;
284 
285         list_for_each_entry(fi, &pd->fi_list, fi_link)
286                 if (offset < fi->offset + fi->len && end > fi->offset)
287                         return true;
288 
289         return false;
290 }
291 
292 /* Assumes that new fragment does not overlap any existing fragments */
293 static struct fwnet_fragment_info *fwnet_frag_new(
294         struct fwnet_partial_datagram *pd, unsigned offset, unsigned len)
295 {
296         struct fwnet_fragment_info *fi, *fi2, *new;
297         struct list_head *list;
298 
299         list = &pd->fi_list;
300         list_for_each_entry(fi, &pd->fi_list, fi_link) {
301                 if (fi->offset + fi->len == offset) {
302                         /* The new fragment can be tacked on to the end */
303                         /* Did the new fragment plug a hole? */
304                         fi2 = list_entry(fi->fi_link.next,
305                                          struct fwnet_fragment_info, fi_link);
306                         if (fi->offset + fi->len == fi2->offset) {
307                                 /* glue fragments together */
308                                 fi->len += len + fi2->len;
309                                 list_del(&fi2->fi_link);
310                                 kfree(fi2);
311                         } else {
312                                 fi->len += len;
313                         }
314 
315                         return fi;
316                 }
317                 if (offset + len == fi->offset) {
318                         /* The new fragment can be tacked on to the beginning */
319                         /* Did the new fragment plug a hole? */
320                         fi2 = list_entry(fi->fi_link.prev,
321                                          struct fwnet_fragment_info, fi_link);
322                         if (fi2->offset + fi2->len == fi->offset) {
323                                 /* glue fragments together */
324                                 fi2->len += fi->len + len;
325                                 list_del(&fi->fi_link);
326                                 kfree(fi);
327 
328                                 return fi2;
329                         }
330                         fi->offset = offset;
331                         fi->len += len;
332 
333                         return fi;
334                 }
335                 if (offset > fi->offset + fi->len) {
336                         list = &fi->fi_link;
337                         break;
338                 }
339                 if (offset + len < fi->offset) {
340                         list = fi->fi_link.prev;
341                         break;
342                 }
343         }
344 
345         new = kmalloc(sizeof(*new), GFP_ATOMIC);
346         if (!new)
347                 return NULL;
348 
349         new->offset = offset;
350         new->len = len;
351         list_add(&new->fi_link, list);
352 
353         return new;
354 }
355 
356 static struct fwnet_partial_datagram *fwnet_pd_new(struct net_device *net,
357                 struct fwnet_peer *peer, u16 datagram_label, unsigned dg_size,
358                 void *frag_buf, unsigned frag_off, unsigned frag_len)
359 {
360         struct fwnet_partial_datagram *new;
361         struct fwnet_fragment_info *fi;
362 
363         new = kmalloc(sizeof(*new), GFP_ATOMIC);
364         if (!new)
365                 goto fail;
366 
367         INIT_LIST_HEAD(&new->fi_list);
368         fi = fwnet_frag_new(new, frag_off, frag_len);
369         if (fi == NULL)
370                 goto fail_w_new;
371 
372         new->datagram_label = datagram_label;
373         new->datagram_size = dg_size;
374         new->skb = dev_alloc_skb(dg_size + LL_RESERVED_SPACE(net));
375         if (new->skb == NULL)
376                 goto fail_w_fi;
377 
378         skb_reserve(new->skb, LL_RESERVED_SPACE(net));
379         new->pbuf = skb_put(new->skb, dg_size);
380         memcpy(new->pbuf + frag_off, frag_buf, frag_len);
381         list_add_tail(&new->pd_link, &peer->pd_list);
382 
383         return new;
384 
385 fail_w_fi:
386         kfree(fi);
387 fail_w_new:
388         kfree(new);
389 fail:
390         return NULL;
391 }
392 
393 static struct fwnet_partial_datagram *fwnet_pd_find(struct fwnet_peer *peer,
394                                                     u16 datagram_label)
395 {
396         struct fwnet_partial_datagram *pd;
397 
398         list_for_each_entry(pd, &peer->pd_list, pd_link)
399                 if (pd->datagram_label == datagram_label)
400                         return pd;
401 
402         return NULL;
403 }
404 
405 
406 static void fwnet_pd_delete(struct fwnet_partial_datagram *old)
407 {
408         struct fwnet_fragment_info *fi, *n;
409 
410         list_for_each_entry_safe(fi, n, &old->fi_list, fi_link)
411                 kfree(fi);
412 
413         list_del(&old->pd_link);
414         dev_kfree_skb_any(old->skb);
415         kfree(old);
416 }
417 
418 static bool fwnet_pd_update(struct fwnet_peer *peer,
419                 struct fwnet_partial_datagram *pd, void *frag_buf,
420                 unsigned frag_off, unsigned frag_len)
421 {
422         if (fwnet_frag_new(pd, frag_off, frag_len) == NULL)
423                 return false;
424 
425         memcpy(pd->pbuf + frag_off, frag_buf, frag_len);
426 
427         /*
428          * Move list entry to beginning of list so that oldest partial
429          * datagrams percolate to the end of the list
430          */
431         list_move_tail(&pd->pd_link, &peer->pd_list);
432 
433         return true;
434 }
435 
436 static bool fwnet_pd_is_complete(struct fwnet_partial_datagram *pd)
437 {
438         struct fwnet_fragment_info *fi;
439 
440         fi = list_entry(pd->fi_list.next, struct fwnet_fragment_info, fi_link);
441 
442         return fi->len == pd->datagram_size;
443 }
444 
445 /* caller must hold dev->lock */
446 static struct fwnet_peer *fwnet_peer_find_by_guid(struct fwnet_device *dev,
447                                                   u64 guid)
448 {
449         struct fwnet_peer *peer;
450 
451         list_for_each_entry(peer, &dev->peer_list, peer_link)
452                 if (peer->guid == guid)
453                         return peer;
454 
455         return NULL;
456 }
457 
458 /* caller must hold dev->lock */
459 static struct fwnet_peer *fwnet_peer_find_by_node_id(struct fwnet_device *dev,
460                                                 int node_id, int generation)
461 {
462         struct fwnet_peer *peer;
463 
464         list_for_each_entry(peer, &dev->peer_list, peer_link)
465                 if (peer->node_id    == node_id &&
466                     peer->generation == generation)
467                         return peer;
468 
469         return NULL;
470 }
471 
472 /* See IEEE 1394-2008 table 6-4, table 8-8, table 16-18. */
473 static unsigned fwnet_max_payload(unsigned max_rec, unsigned speed)
474 {
475         max_rec = min(max_rec, speed + 8);
476         max_rec = clamp(max_rec, 8U, 11U); /* 512...4096 */
477 
478         return (1 << (max_rec + 1)) - RFC2374_FRAG_HDR_SIZE;
479 }
480 
481 
482 static int fwnet_finish_incoming_packet(struct net_device *net,
483                                         struct sk_buff *skb, u16 source_node_id,
484                                         bool is_broadcast, u16 ether_type)
485 {
486         struct fwnet_device *dev;
487         int status;
488         __be64 guid;
489 
490         switch (ether_type) {
491         case ETH_P_ARP:
492         case ETH_P_IP:
493 #if IS_ENABLED(CONFIG_IPV6)
494         case ETH_P_IPV6:
495 #endif
496                 break;
497         default:
498                 goto err;
499         }
500 
501         dev = netdev_priv(net);
502         /* Write metadata, and then pass to the receive level */
503         skb->dev = net;
504         skb->ip_summed = CHECKSUM_NONE;
505 
506         /*
507          * Parse the encapsulation header. This actually does the job of
508          * converting to an ethernet-like pseudo frame header.
509          */
510         guid = cpu_to_be64(dev->card->guid);
511         if (dev_hard_header(skb, net, ether_type,
512                            is_broadcast ? net->broadcast : net->dev_addr,
513                            NULL, skb->len) >= 0) {
514                 struct fwnet_header *eth;
515                 u16 *rawp;
516                 __be16 protocol;
517 
518                 skb_reset_mac_header(skb);
519                 skb_pull(skb, sizeof(*eth));
520                 eth = (struct fwnet_header *)skb_mac_header(skb);
521                 if (fwnet_hwaddr_is_multicast(eth->h_dest)) {
522                         if (memcmp(eth->h_dest, net->broadcast,
523                                    net->addr_len) == 0)
524                                 skb->pkt_type = PACKET_BROADCAST;
525 #if 0
526                         else
527                                 skb->pkt_type = PACKET_MULTICAST;
528 #endif
529                 } else {
530                         if (memcmp(eth->h_dest, net->dev_addr, net->addr_len))
531                                 skb->pkt_type = PACKET_OTHERHOST;
532                 }
533                 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN) {
534                         protocol = eth->h_proto;
535                 } else {
536                         rawp = (u16 *)skb->data;
537                         if (*rawp == 0xffff)
538                                 protocol = htons(ETH_P_802_3);
539                         else
540                                 protocol = htons(ETH_P_802_2);
541                 }
542                 skb->protocol = protocol;
543         }
544         status = netif_rx(skb);
545         if (status == NET_RX_DROP) {
546                 net->stats.rx_errors++;
547                 net->stats.rx_dropped++;
548         } else {
549                 net->stats.rx_packets++;
550                 net->stats.rx_bytes += skb->len;
551         }
552 
553         return 0;
554 
555  err:
556         net->stats.rx_errors++;
557         net->stats.rx_dropped++;
558 
559         dev_kfree_skb_any(skb);
560 
561         return -ENOENT;
562 }
563 
564 static int fwnet_incoming_packet(struct fwnet_device *dev, __be32 *buf, int len,
565                                  int source_node_id, int generation,
566                                  bool is_broadcast)
567 {
568         struct sk_buff *skb;
569         struct net_device *net = dev->netdev;
570         struct rfc2734_header hdr;
571         unsigned lf;
572         unsigned long flags;
573         struct fwnet_peer *peer;
574         struct fwnet_partial_datagram *pd;
575         int fg_off;
576         int dg_size;
577         u16 datagram_label;
578         int retval;
579         u16 ether_type;
580 
581         hdr.w0 = be32_to_cpu(buf[0]);
582         lf = fwnet_get_hdr_lf(&hdr);
583         if (lf == RFC2374_HDR_UNFRAG) {
584                 /*
585                  * An unfragmented datagram has been received by the ieee1394
586                  * bus. Build an skbuff around it so we can pass it to the
587                  * high level network layer.
588                  */
589                 ether_type = fwnet_get_hdr_ether_type(&hdr);
590                 buf++;
591                 len -= RFC2374_UNFRAG_HDR_SIZE;
592 
593                 skb = dev_alloc_skb(len + LL_RESERVED_SPACE(net));
594                 if (unlikely(!skb)) {
595                         net->stats.rx_dropped++;
596 
597                         return -ENOMEM;
598                 }
599                 skb_reserve(skb, LL_RESERVED_SPACE(net));
600                 memcpy(skb_put(skb, len), buf, len);
601 
602                 return fwnet_finish_incoming_packet(net, skb, source_node_id,
603                                                     is_broadcast, ether_type);
604         }
605         /* A datagram fragment has been received, now the fun begins. */
606         hdr.w1 = ntohl(buf[1]);
607         buf += 2;
608         len -= RFC2374_FRAG_HDR_SIZE;
609         if (lf == RFC2374_HDR_FIRSTFRAG) {
610                 ether_type = fwnet_get_hdr_ether_type(&hdr);
611                 fg_off = 0;
612         } else {
613                 ether_type = 0;
614                 fg_off = fwnet_get_hdr_fg_off(&hdr);
615         }
616         datagram_label = fwnet_get_hdr_dgl(&hdr);
617         dg_size = fwnet_get_hdr_dg_size(&hdr); /* ??? + 1 */
618 
619         spin_lock_irqsave(&dev->lock, flags);
620 
621         peer = fwnet_peer_find_by_node_id(dev, source_node_id, generation);
622         if (!peer) {
623                 retval = -ENOENT;
624                 goto fail;
625         }
626 
627         pd = fwnet_pd_find(peer, datagram_label);
628         if (pd == NULL) {
629                 while (peer->pdg_size >= FWNET_MAX_FRAGMENTS) {
630                         /* remove the oldest */
631                         fwnet_pd_delete(list_first_entry(&peer->pd_list,
632                                 struct fwnet_partial_datagram, pd_link));
633                         peer->pdg_size--;
634                 }
635                 pd = fwnet_pd_new(net, peer, datagram_label,
636                                   dg_size, buf, fg_off, len);
637                 if (pd == NULL) {
638                         retval = -ENOMEM;
639                         goto fail;
640                 }
641                 peer->pdg_size++;
642         } else {
643                 if (fwnet_frag_overlap(pd, fg_off, len) ||
644                     pd->datagram_size != dg_size) {
645                         /*
646                          * Differing datagram sizes or overlapping fragments,
647                          * discard old datagram and start a new one.
648                          */
649                         fwnet_pd_delete(pd);
650                         pd = fwnet_pd_new(net, peer, datagram_label,
651                                           dg_size, buf, fg_off, len);
652                         if (pd == NULL) {
653                                 peer->pdg_size--;
654                                 retval = -ENOMEM;
655                                 goto fail;
656                         }
657                 } else {
658                         if (!fwnet_pd_update(peer, pd, buf, fg_off, len)) {
659                                 /*
660                                  * Couldn't save off fragment anyway
661                                  * so might as well obliterate the
662                                  * datagram now.
663                                  */
664                                 fwnet_pd_delete(pd);
665                                 peer->pdg_size--;
666                                 retval = -ENOMEM;
667                                 goto fail;
668                         }
669                 }
670         } /* new datagram or add to existing one */
671 
672         if (lf == RFC2374_HDR_FIRSTFRAG)
673                 pd->ether_type = ether_type;
674 
675         if (fwnet_pd_is_complete(pd)) {
676                 ether_type = pd->ether_type;
677                 peer->pdg_size--;
678                 skb = skb_get(pd->skb);
679                 fwnet_pd_delete(pd);
680 
681                 spin_unlock_irqrestore(&dev->lock, flags);
682 
683                 return fwnet_finish_incoming_packet(net, skb, source_node_id,
684                                                     false, ether_type);
685         }
686         /*
687          * Datagram is not complete, we're done for the
688          * moment.
689          */
690         retval = 0;
691  fail:
692         spin_unlock_irqrestore(&dev->lock, flags);
693 
694         return retval;
695 }
696 
697 static void fwnet_receive_packet(struct fw_card *card, struct fw_request *r,
698                 int tcode, int destination, int source, int generation,
699                 unsigned long long offset, void *payload, size_t length,
700                 void *callback_data)
701 {
702         struct fwnet_device *dev = callback_data;
703         int rcode;
704 
705         if (destination == IEEE1394_ALL_NODES) {
706                 kfree(r);
707 
708                 return;
709         }
710 
711         if (offset != dev->handler.offset)
712                 rcode = RCODE_ADDRESS_ERROR;
713         else if (tcode != TCODE_WRITE_BLOCK_REQUEST)
714                 rcode = RCODE_TYPE_ERROR;
715         else if (fwnet_incoming_packet(dev, payload, length,
716                                        source, generation, false) != 0) {
717                 dev_err(&dev->netdev->dev, "incoming packet failure\n");
718                 rcode = RCODE_CONFLICT_ERROR;
719         } else
720                 rcode = RCODE_COMPLETE;
721 
722         fw_send_response(card, r, rcode);
723 }
724 
725 static void fwnet_receive_broadcast(struct fw_iso_context *context,
726                 u32 cycle, size_t header_length, void *header, void *data)
727 {
728         struct fwnet_device *dev;
729         struct fw_iso_packet packet;
730         __be16 *hdr_ptr;
731         __be32 *buf_ptr;
732         int retval;
733         u32 length;
734         u16 source_node_id;
735         u32 specifier_id;
736         u32 ver;
737         unsigned long offset;
738         unsigned long flags;
739 
740         dev = data;
741         hdr_ptr = header;
742         length = be16_to_cpup(hdr_ptr);
743 
744         spin_lock_irqsave(&dev->lock, flags);
745 
746         offset = dev->rcv_buffer_size * dev->broadcast_rcv_next_ptr;
747         buf_ptr = dev->broadcast_rcv_buffer_ptrs[dev->broadcast_rcv_next_ptr++];
748         if (dev->broadcast_rcv_next_ptr == dev->num_broadcast_rcv_ptrs)
749                 dev->broadcast_rcv_next_ptr = 0;
750 
751         spin_unlock_irqrestore(&dev->lock, flags);
752 
753         specifier_id =    (be32_to_cpu(buf_ptr[0]) & 0xffff) << 8
754                         | (be32_to_cpu(buf_ptr[1]) & 0xff000000) >> 24;
755         ver = be32_to_cpu(buf_ptr[1]) & 0xffffff;
756         source_node_id = be32_to_cpu(buf_ptr[0]) >> 16;
757 
758         if (specifier_id == IANA_SPECIFIER_ID &&
759             (ver == RFC2734_SW_VERSION
760 #if IS_ENABLED(CONFIG_IPV6)
761              || ver == RFC3146_SW_VERSION
762 #endif
763             )) {
764                 buf_ptr += 2;
765                 length -= IEEE1394_GASP_HDR_SIZE;
766                 fwnet_incoming_packet(dev, buf_ptr, length, source_node_id,
767                                       context->card->generation, true);
768         }
769 
770         packet.payload_length = dev->rcv_buffer_size;
771         packet.interrupt = 1;
772         packet.skip = 0;
773         packet.tag = 3;
774         packet.sy = 0;
775         packet.header_length = IEEE1394_GASP_HDR_SIZE;
776 
777         spin_lock_irqsave(&dev->lock, flags);
778 
779         retval = fw_iso_context_queue(dev->broadcast_rcv_context, &packet,
780                                       &dev->broadcast_rcv_buffer, offset);
781 
782         spin_unlock_irqrestore(&dev->lock, flags);
783 
784         if (retval >= 0)
785                 fw_iso_context_queue_flush(dev->broadcast_rcv_context);
786         else
787                 dev_err(&dev->netdev->dev, "requeue failed\n");
788 }
789 
790 static struct kmem_cache *fwnet_packet_task_cache;
791 
792 static void fwnet_free_ptask(struct fwnet_packet_task *ptask)
793 {
794         dev_kfree_skb_any(ptask->skb);
795         kmem_cache_free(fwnet_packet_task_cache, ptask);
796 }
797 
798 /* Caller must hold dev->lock. */
799 static void dec_queued_datagrams(struct fwnet_device *dev)
800 {
801         if (--dev->queued_datagrams == FWNET_MIN_QUEUED_DATAGRAMS)
802                 netif_wake_queue(dev->netdev);
803 }
804 
805 static int fwnet_send_packet(struct fwnet_packet_task *ptask);
806 
807 static void fwnet_transmit_packet_done(struct fwnet_packet_task *ptask)
808 {
809         struct fwnet_device *dev = ptask->dev;
810         struct sk_buff *skb = ptask->skb;
811         unsigned long flags;
812         bool free;
813 
814         spin_lock_irqsave(&dev->lock, flags);
815 
816         ptask->outstanding_pkts--;
817 
818         /* Check whether we or the networking TX soft-IRQ is last user. */
819         free = (ptask->outstanding_pkts == 0 && ptask->enqueued);
820         if (free)
821                 dec_queued_datagrams(dev);
822 
823         if (ptask->outstanding_pkts == 0) {
824                 dev->netdev->stats.tx_packets++;
825                 dev->netdev->stats.tx_bytes += skb->len;
826         }
827 
828         spin_unlock_irqrestore(&dev->lock, flags);
829 
830         if (ptask->outstanding_pkts > 0) {
831                 u16 dg_size;
832                 u16 fg_off;
833                 u16 datagram_label;
834                 u16 lf;
835 
836                 /* Update the ptask to point to the next fragment and send it */
837                 lf = fwnet_get_hdr_lf(&ptask->hdr);
838                 switch (lf) {
839                 case RFC2374_HDR_LASTFRAG:
840                 case RFC2374_HDR_UNFRAG:
841                 default:
842                         dev_err(&dev->netdev->dev,
843                                 "outstanding packet %x lf %x, header %x,%x\n",
844                                 ptask->outstanding_pkts, lf, ptask->hdr.w0,
845                                 ptask->hdr.w1);
846                         BUG();
847 
848                 case RFC2374_HDR_FIRSTFRAG:
849                         /* Set frag type here for future interior fragments */
850                         dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
851                         fg_off = ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
852                         datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
853                         break;
854 
855                 case RFC2374_HDR_INTFRAG:
856                         dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
857                         fg_off = fwnet_get_hdr_fg_off(&ptask->hdr)
858                                   + ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
859                         datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
860                         break;
861                 }
862 
863                 if (ptask->dest_node == IEEE1394_ALL_NODES) {
864                         skb_pull(skb,
865                                  ptask->max_payload + IEEE1394_GASP_HDR_SIZE);
866                 } else {
867                         skb_pull(skb, ptask->max_payload);
868                 }
869                 if (ptask->outstanding_pkts > 1) {
870                         fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_INTFRAG,
871                                           dg_size, fg_off, datagram_label);
872                 } else {
873                         fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_LASTFRAG,
874                                           dg_size, fg_off, datagram_label);
875                         ptask->max_payload = skb->len + RFC2374_FRAG_HDR_SIZE;
876                 }
877                 fwnet_send_packet(ptask);
878         }
879 
880         if (free)
881                 fwnet_free_ptask(ptask);
882 }
883 
884 static void fwnet_transmit_packet_failed(struct fwnet_packet_task *ptask)
885 {
886         struct fwnet_device *dev = ptask->dev;
887         unsigned long flags;
888         bool free;
889 
890         spin_lock_irqsave(&dev->lock, flags);
891 
892         /* One fragment failed; don't try to send remaining fragments. */
893         ptask->outstanding_pkts = 0;
894 
895         /* Check whether we or the networking TX soft-IRQ is last user. */
896         free = ptask->enqueued;
897         if (free)
898                 dec_queued_datagrams(dev);
899 
900         dev->netdev->stats.tx_dropped++;
901         dev->netdev->stats.tx_errors++;
902 
903         spin_unlock_irqrestore(&dev->lock, flags);
904 
905         if (free)
906                 fwnet_free_ptask(ptask);
907 }
908 
909 static void fwnet_write_complete(struct fw_card *card, int rcode,
910                                  void *payload, size_t length, void *data)
911 {
912         struct fwnet_packet_task *ptask = data;
913         static unsigned long j;
914         static int last_rcode, errors_skipped;
915 
916         if (rcode == RCODE_COMPLETE) {
917                 fwnet_transmit_packet_done(ptask);
918         } else {
919                 if (printk_timed_ratelimit(&j,  1000) || rcode != last_rcode) {
920                         dev_err(&ptask->dev->netdev->dev,
921                                 "fwnet_write_complete failed: %x (skipped %d)\n",
922                                 rcode, errors_skipped);
923 
924                         errors_skipped = 0;
925                         last_rcode = rcode;
926                 } else {
927                         errors_skipped++;
928                 }
929                 fwnet_transmit_packet_failed(ptask);
930         }
931 }
932 
933 static int fwnet_send_packet(struct fwnet_packet_task *ptask)
934 {
935         struct fwnet_device *dev;
936         unsigned tx_len;
937         struct rfc2734_header *bufhdr;
938         unsigned long flags;
939         bool free;
940 
941         dev = ptask->dev;
942         tx_len = ptask->max_payload;
943         switch (fwnet_get_hdr_lf(&ptask->hdr)) {
944         case RFC2374_HDR_UNFRAG:
945                 bufhdr = (struct rfc2734_header *)
946                                 skb_push(ptask->skb, RFC2374_UNFRAG_HDR_SIZE);
947                 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
948                 break;
949 
950         case RFC2374_HDR_FIRSTFRAG:
951         case RFC2374_HDR_INTFRAG:
952         case RFC2374_HDR_LASTFRAG:
953                 bufhdr = (struct rfc2734_header *)
954                                 skb_push(ptask->skb, RFC2374_FRAG_HDR_SIZE);
955                 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
956                 put_unaligned_be32(ptask->hdr.w1, &bufhdr->w1);
957                 break;
958 
959         default:
960                 BUG();
961         }
962         if (ptask->dest_node == IEEE1394_ALL_NODES) {
963                 u8 *p;
964                 int generation;
965                 int node_id;
966                 unsigned int sw_version;
967 
968                 /* ptask->generation may not have been set yet */
969                 generation = dev->card->generation;
970                 smp_rmb();
971                 node_id = dev->card->node_id;
972 
973                 switch (ptask->skb->protocol) {
974                 default:
975                         sw_version = RFC2734_SW_VERSION;
976                         break;
977 #if IS_ENABLED(CONFIG_IPV6)
978                 case htons(ETH_P_IPV6):
979                         sw_version = RFC3146_SW_VERSION;
980 #endif
981                 }
982 
983                 p = skb_push(ptask->skb, IEEE1394_GASP_HDR_SIZE);
984                 put_unaligned_be32(node_id << 16 | IANA_SPECIFIER_ID >> 8, p);
985                 put_unaligned_be32((IANA_SPECIFIER_ID & 0xff) << 24
986                                                 | sw_version, &p[4]);
987 
988                 /* We should not transmit if broadcast_channel.valid == 0. */
989                 fw_send_request(dev->card, &ptask->transaction,
990                                 TCODE_STREAM_DATA,
991                                 fw_stream_packet_destination_id(3,
992                                                 IEEE1394_BROADCAST_CHANNEL, 0),
993                                 generation, SCODE_100, 0ULL, ptask->skb->data,
994                                 tx_len + 8, fwnet_write_complete, ptask);
995 
996                 spin_lock_irqsave(&dev->lock, flags);
997 
998                 /* If the AT tasklet already ran, we may be last user. */
999                 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1000                 if (!free)
1001                         ptask->enqueued = true;
1002                 else
1003                         dec_queued_datagrams(dev);
1004 
1005                 spin_unlock_irqrestore(&dev->lock, flags);
1006 
1007                 goto out;
1008         }
1009 
1010         fw_send_request(dev->card, &ptask->transaction,
1011                         TCODE_WRITE_BLOCK_REQUEST, ptask->dest_node,
1012                         ptask->generation, ptask->speed, ptask->fifo_addr,
1013                         ptask->skb->data, tx_len, fwnet_write_complete, ptask);
1014 
1015         spin_lock_irqsave(&dev->lock, flags);
1016 
1017         /* If the AT tasklet already ran, we may be last user. */
1018         free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1019         if (!free)
1020                 ptask->enqueued = true;
1021         else
1022                 dec_queued_datagrams(dev);
1023 
1024         spin_unlock_irqrestore(&dev->lock, flags);
1025 
1026         dev->netdev->trans_start = jiffies;
1027  out:
1028         if (free)
1029                 fwnet_free_ptask(ptask);
1030 
1031         return 0;
1032 }
1033 
1034 static void fwnet_fifo_stop(struct fwnet_device *dev)
1035 {
1036         if (dev->local_fifo == FWNET_NO_FIFO_ADDR)
1037                 return;
1038 
1039         fw_core_remove_address_handler(&dev->handler);
1040         dev->local_fifo = FWNET_NO_FIFO_ADDR;
1041 }
1042 
1043 static int fwnet_fifo_start(struct fwnet_device *dev)
1044 {
1045         int retval;
1046 
1047         if (dev->local_fifo != FWNET_NO_FIFO_ADDR)
1048                 return 0;
1049 
1050         dev->handler.length = 4096;
1051         dev->handler.address_callback = fwnet_receive_packet;
1052         dev->handler.callback_data = dev;
1053 
1054         retval = fw_core_add_address_handler(&dev->handler,
1055                                              &fw_high_memory_region);
1056         if (retval < 0)
1057                 return retval;
1058 
1059         dev->local_fifo = dev->handler.offset;
1060 
1061         return 0;
1062 }
1063 
1064 static void __fwnet_broadcast_stop(struct fwnet_device *dev)
1065 {
1066         unsigned u;
1067 
1068         if (dev->broadcast_state != FWNET_BROADCAST_ERROR) {
1069                 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++)
1070                         kunmap(dev->broadcast_rcv_buffer.pages[u]);
1071                 fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer, dev->card);
1072         }
1073         if (dev->broadcast_rcv_context) {
1074                 fw_iso_context_destroy(dev->broadcast_rcv_context);
1075                 dev->broadcast_rcv_context = NULL;
1076         }
1077         kfree(dev->broadcast_rcv_buffer_ptrs);
1078         dev->broadcast_rcv_buffer_ptrs = NULL;
1079         dev->broadcast_state = FWNET_BROADCAST_ERROR;
1080 }
1081 
1082 static void fwnet_broadcast_stop(struct fwnet_device *dev)
1083 {
1084         if (dev->broadcast_state == FWNET_BROADCAST_ERROR)
1085                 return;
1086         fw_iso_context_stop(dev->broadcast_rcv_context);
1087         __fwnet_broadcast_stop(dev);
1088 }
1089 
1090 static int fwnet_broadcast_start(struct fwnet_device *dev)
1091 {
1092         struct fw_iso_context *context;
1093         int retval;
1094         unsigned num_packets;
1095         unsigned max_receive;
1096         struct fw_iso_packet packet;
1097         unsigned long offset;
1098         void **ptrptr;
1099         unsigned u;
1100 
1101         if (dev->broadcast_state != FWNET_BROADCAST_ERROR)
1102                 return 0;
1103 
1104         max_receive = 1U << (dev->card->max_receive + 1);
1105         num_packets = (FWNET_ISO_PAGE_COUNT * PAGE_SIZE) / max_receive;
1106 
1107         ptrptr = kmalloc(sizeof(void *) * num_packets, GFP_KERNEL);
1108         if (!ptrptr) {
1109                 retval = -ENOMEM;
1110                 goto failed;
1111         }
1112         dev->broadcast_rcv_buffer_ptrs = ptrptr;
1113 
1114         context = fw_iso_context_create(dev->card, FW_ISO_CONTEXT_RECEIVE,
1115                                         IEEE1394_BROADCAST_CHANNEL,
1116                                         dev->card->link_speed, 8,
1117                                         fwnet_receive_broadcast, dev);
1118         if (IS_ERR(context)) {
1119                 retval = PTR_ERR(context);
1120                 goto failed;
1121         }
1122 
1123         retval = fw_iso_buffer_init(&dev->broadcast_rcv_buffer, dev->card,
1124                                     FWNET_ISO_PAGE_COUNT, DMA_FROM_DEVICE);
1125         if (retval < 0)
1126                 goto failed;
1127 
1128         dev->broadcast_state = FWNET_BROADCAST_STOPPED;
1129 
1130         for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++) {
1131                 void *ptr;
1132                 unsigned v;
1133 
1134                 ptr = kmap(dev->broadcast_rcv_buffer.pages[u]);
1135                 for (v = 0; v < num_packets / FWNET_ISO_PAGE_COUNT; v++)
1136                         *ptrptr++ = (void *) ((char *)ptr + v * max_receive);
1137         }
1138         dev->broadcast_rcv_context = context;
1139 
1140         packet.payload_length = max_receive;
1141         packet.interrupt = 1;
1142         packet.skip = 0;
1143         packet.tag = 3;
1144         packet.sy = 0;
1145         packet.header_length = IEEE1394_GASP_HDR_SIZE;
1146         offset = 0;
1147 
1148         for (u = 0; u < num_packets; u++) {
1149                 retval = fw_iso_context_queue(context, &packet,
1150                                 &dev->broadcast_rcv_buffer, offset);
1151                 if (retval < 0)
1152                         goto failed;
1153 
1154                 offset += max_receive;
1155         }
1156         dev->num_broadcast_rcv_ptrs = num_packets;
1157         dev->rcv_buffer_size = max_receive;
1158         dev->broadcast_rcv_next_ptr = 0U;
1159         retval = fw_iso_context_start(context, -1, 0,
1160                         FW_ISO_CONTEXT_MATCH_ALL_TAGS); /* ??? sync */
1161         if (retval < 0)
1162                 goto failed;
1163 
1164         /* FIXME: adjust it according to the min. speed of all known peers? */
1165         dev->broadcast_xmt_max_payload = IEEE1394_MAX_PAYLOAD_S100
1166                         - IEEE1394_GASP_HDR_SIZE - RFC2374_UNFRAG_HDR_SIZE;
1167         dev->broadcast_state = FWNET_BROADCAST_RUNNING;
1168 
1169         return 0;
1170 
1171  failed:
1172         __fwnet_broadcast_stop(dev);
1173         return retval;
1174 }
1175 
1176 static void set_carrier_state(struct fwnet_device *dev)
1177 {
1178         if (dev->peer_count > 1)
1179                 netif_carrier_on(dev->netdev);
1180         else
1181                 netif_carrier_off(dev->netdev);
1182 }
1183 
1184 /* ifup */
1185 static int fwnet_open(struct net_device *net)
1186 {
1187         struct fwnet_device *dev = netdev_priv(net);
1188         int ret;
1189 
1190         ret = fwnet_broadcast_start(dev);
1191         if (ret)
1192                 return ret;
1193 
1194         netif_start_queue(net);
1195 
1196         spin_lock_irq(&dev->lock);
1197         set_carrier_state(dev);
1198         spin_unlock_irq(&dev->lock);
1199 
1200         return 0;
1201 }
1202 
1203 /* ifdown */
1204 static int fwnet_stop(struct net_device *net)
1205 {
1206         struct fwnet_device *dev = netdev_priv(net);
1207 
1208         netif_stop_queue(net);
1209         fwnet_broadcast_stop(dev);
1210 
1211         return 0;
1212 }
1213 
1214 static netdev_tx_t fwnet_tx(struct sk_buff *skb, struct net_device *net)
1215 {
1216         struct fwnet_header hdr_buf;
1217         struct fwnet_device *dev = netdev_priv(net);
1218         __be16 proto;
1219         u16 dest_node;
1220         unsigned max_payload;
1221         u16 dg_size;
1222         u16 *datagram_label_ptr;
1223         struct fwnet_packet_task *ptask;
1224         struct fwnet_peer *peer;
1225         unsigned long flags;
1226 
1227         spin_lock_irqsave(&dev->lock, flags);
1228 
1229         /* Can this happen? */
1230         if (netif_queue_stopped(dev->netdev)) {
1231                 spin_unlock_irqrestore(&dev->lock, flags);
1232 
1233                 return NETDEV_TX_BUSY;
1234         }
1235 
1236         ptask = kmem_cache_alloc(fwnet_packet_task_cache, GFP_ATOMIC);
1237         if (ptask == NULL)
1238                 goto fail;
1239 
1240         skb = skb_share_check(skb, GFP_ATOMIC);
1241         if (!skb)
1242                 goto fail;
1243 
1244         /*
1245          * Make a copy of the driver-specific header.
1246          * We might need to rebuild the header on tx failure.
1247          */
1248         memcpy(&hdr_buf, skb->data, sizeof(hdr_buf));
1249         proto = hdr_buf.h_proto;
1250 
1251         switch (proto) {
1252         case htons(ETH_P_ARP):
1253         case htons(ETH_P_IP):
1254 #if IS_ENABLED(CONFIG_IPV6)
1255         case htons(ETH_P_IPV6):
1256 #endif
1257                 break;
1258         default:
1259                 goto fail;
1260         }
1261 
1262         skb_pull(skb, sizeof(hdr_buf));
1263         dg_size = skb->len;
1264 
1265         /*
1266          * Set the transmission type for the packet.  ARP packets and IP
1267          * broadcast packets are sent via GASP.
1268          */
1269         if (fwnet_hwaddr_is_multicast(hdr_buf.h_dest)) {
1270                 max_payload        = dev->broadcast_xmt_max_payload;
1271                 datagram_label_ptr = &dev->broadcast_xmt_datagramlabel;
1272 
1273                 ptask->fifo_addr   = FWNET_NO_FIFO_ADDR;
1274                 ptask->generation  = 0;
1275                 ptask->dest_node   = IEEE1394_ALL_NODES;
1276                 ptask->speed       = SCODE_100;
1277         } else {
1278                 union fwnet_hwaddr *ha = (union fwnet_hwaddr *)hdr_buf.h_dest;
1279                 __be64 guid = get_unaligned(&ha->uc.uniq_id);
1280                 u8 generation;
1281 
1282                 peer = fwnet_peer_find_by_guid(dev, be64_to_cpu(guid));
1283                 if (!peer)
1284                         goto fail;
1285 
1286                 generation         = peer->generation;
1287                 dest_node          = peer->node_id;
1288                 max_payload        = peer->max_payload;
1289                 datagram_label_ptr = &peer->datagram_label;
1290 
1291                 ptask->fifo_addr   = fwnet_hwaddr_fifo(ha);
1292                 ptask->generation  = generation;
1293                 ptask->dest_node   = dest_node;
1294                 ptask->speed       = peer->speed;
1295         }
1296 
1297         ptask->hdr.w0 = 0;
1298         ptask->hdr.w1 = 0;
1299         ptask->skb = skb;
1300         ptask->dev = dev;
1301 
1302         /* Does it all fit in one packet? */
1303         if (dg_size <= max_payload) {
1304                 fwnet_make_uf_hdr(&ptask->hdr, ntohs(proto));
1305                 ptask->outstanding_pkts = 1;
1306                 max_payload = dg_size + RFC2374_UNFRAG_HDR_SIZE;
1307         } else {
1308                 u16 datagram_label;
1309 
1310                 max_payload -= RFC2374_FRAG_OVERHEAD;
1311                 datagram_label = (*datagram_label_ptr)++;
1312                 fwnet_make_ff_hdr(&ptask->hdr, ntohs(proto), dg_size,
1313                                   datagram_label);
1314                 ptask->outstanding_pkts = DIV_ROUND_UP(dg_size, max_payload);
1315                 max_payload += RFC2374_FRAG_HDR_SIZE;
1316         }
1317 
1318         if (++dev->queued_datagrams == FWNET_MAX_QUEUED_DATAGRAMS)
1319                 netif_stop_queue(dev->netdev);
1320 
1321         spin_unlock_irqrestore(&dev->lock, flags);
1322 
1323         ptask->max_payload = max_payload;
1324         ptask->enqueued    = 0;
1325 
1326         fwnet_send_packet(ptask);
1327 
1328         return NETDEV_TX_OK;
1329 
1330  fail:
1331         spin_unlock_irqrestore(&dev->lock, flags);
1332 
1333         if (ptask)
1334                 kmem_cache_free(fwnet_packet_task_cache, ptask);
1335 
1336         if (skb != NULL)
1337                 dev_kfree_skb(skb);
1338 
1339         net->stats.tx_dropped++;
1340         net->stats.tx_errors++;
1341 
1342         /*
1343          * FIXME: According to a patch from 2003-02-26, "returning non-zero
1344          * causes serious problems" here, allegedly.  Before that patch,
1345          * -ERRNO was returned which is not appropriate under Linux 2.6.
1346          * Perhaps more needs to be done?  Stop the queue in serious
1347          * conditions and restart it elsewhere?
1348          */
1349         return NETDEV_TX_OK;
1350 }
1351 
1352 static int fwnet_change_mtu(struct net_device *net, int new_mtu)
1353 {
1354         if (new_mtu < 68)
1355                 return -EINVAL;
1356 
1357         net->mtu = new_mtu;
1358         return 0;
1359 }
1360 
1361 static const struct ethtool_ops fwnet_ethtool_ops = {
1362         .get_link       = ethtool_op_get_link,
1363 };
1364 
1365 static const struct net_device_ops fwnet_netdev_ops = {
1366         .ndo_open       = fwnet_open,
1367         .ndo_stop       = fwnet_stop,
1368         .ndo_start_xmit = fwnet_tx,
1369         .ndo_change_mtu = fwnet_change_mtu,
1370 };
1371 
1372 static void fwnet_init_dev(struct net_device *net)
1373 {
1374         net->header_ops         = &fwnet_header_ops;
1375         net->netdev_ops         = &fwnet_netdev_ops;
1376         net->watchdog_timeo     = 2 * HZ;
1377         net->flags              = IFF_BROADCAST | IFF_MULTICAST;
1378         net->features           = NETIF_F_HIGHDMA;
1379         net->addr_len           = FWNET_ALEN;
1380         net->hard_header_len    = FWNET_HLEN;
1381         net->type               = ARPHRD_IEEE1394;
1382         net->tx_queue_len       = FWNET_TX_QUEUE_LEN;
1383         net->ethtool_ops        = &fwnet_ethtool_ops;
1384 }
1385 
1386 /* caller must hold fwnet_device_mutex */
1387 static struct fwnet_device *fwnet_dev_find(struct fw_card *card)
1388 {
1389         struct fwnet_device *dev;
1390 
1391         list_for_each_entry(dev, &fwnet_device_list, dev_link)
1392                 if (dev->card == card)
1393                         return dev;
1394 
1395         return NULL;
1396 }
1397 
1398 static int fwnet_add_peer(struct fwnet_device *dev,
1399                           struct fw_unit *unit, struct fw_device *device)
1400 {
1401         struct fwnet_peer *peer;
1402 
1403         peer = kmalloc(sizeof(*peer), GFP_KERNEL);
1404         if (!peer)
1405                 return -ENOMEM;
1406 
1407         dev_set_drvdata(&unit->device, peer);
1408 
1409         peer->dev = dev;
1410         peer->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4];
1411         INIT_LIST_HEAD(&peer->pd_list);
1412         peer->pdg_size = 0;
1413         peer->datagram_label = 0;
1414         peer->speed = device->max_speed;
1415         peer->max_payload = fwnet_max_payload(device->max_rec, peer->speed);
1416 
1417         peer->generation = device->generation;
1418         smp_rmb();
1419         peer->node_id = device->node_id;
1420 
1421         spin_lock_irq(&dev->lock);
1422         list_add_tail(&peer->peer_link, &dev->peer_list);
1423         dev->peer_count++;
1424         set_carrier_state(dev);
1425         spin_unlock_irq(&dev->lock);
1426 
1427         return 0;
1428 }
1429 
1430 static int fwnet_probe(struct fw_unit *unit,
1431                        const struct ieee1394_device_id *id)
1432 {
1433         struct fw_device *device = fw_parent_device(unit);
1434         struct fw_card *card = device->card;
1435         struct net_device *net;
1436         bool allocated_netdev = false;
1437         struct fwnet_device *dev;
1438         unsigned max_mtu;
1439         int ret;
1440         union fwnet_hwaddr *ha;
1441 
1442         mutex_lock(&fwnet_device_mutex);
1443 
1444         dev = fwnet_dev_find(card);
1445         if (dev) {
1446                 net = dev->netdev;
1447                 goto have_dev;
1448         }
1449 
1450         net = alloc_netdev(sizeof(*dev), "firewire%d", NET_NAME_UNKNOWN,
1451                            fwnet_init_dev);
1452         if (net == NULL) {
1453                 mutex_unlock(&fwnet_device_mutex);
1454                 return -ENOMEM;
1455         }
1456 
1457         allocated_netdev = true;
1458         SET_NETDEV_DEV(net, card->device);
1459         dev = netdev_priv(net);
1460 
1461         spin_lock_init(&dev->lock);
1462         dev->broadcast_state = FWNET_BROADCAST_ERROR;
1463         dev->broadcast_rcv_context = NULL;
1464         dev->broadcast_xmt_max_payload = 0;
1465         dev->broadcast_xmt_datagramlabel = 0;
1466         dev->local_fifo = FWNET_NO_FIFO_ADDR;
1467         dev->queued_datagrams = 0;
1468         INIT_LIST_HEAD(&dev->peer_list);
1469         dev->card = card;
1470         dev->netdev = net;
1471 
1472         ret = fwnet_fifo_start(dev);
1473         if (ret < 0)
1474                 goto out;
1475         dev->local_fifo = dev->handler.offset;
1476 
1477         /*
1478          * Use the RFC 2734 default 1500 octets or the maximum payload
1479          * as initial MTU
1480          */
1481         max_mtu = (1 << (card->max_receive + 1))
1482                   - sizeof(struct rfc2734_header) - IEEE1394_GASP_HDR_SIZE;
1483         net->mtu = min(1500U, max_mtu);
1484 
1485         /* Set our hardware address while we're at it */
1486         ha = (union fwnet_hwaddr *)net->dev_addr;
1487         put_unaligned_be64(card->guid, &ha->uc.uniq_id);
1488         ha->uc.max_rec = dev->card->max_receive;
1489         ha->uc.sspd = dev->card->link_speed;
1490         put_unaligned_be16(dev->local_fifo >> 32, &ha->uc.fifo_hi);
1491         put_unaligned_be32(dev->local_fifo & 0xffffffff, &ha->uc.fifo_lo);
1492 
1493         memset(net->broadcast, -1, net->addr_len);
1494 
1495         ret = register_netdev(net);
1496         if (ret)
1497                 goto out;
1498 
1499         list_add_tail(&dev->dev_link, &fwnet_device_list);
1500         dev_notice(&net->dev, "IP over IEEE 1394 on card %s\n",
1501                    dev_name(card->device));
1502  have_dev:
1503         ret = fwnet_add_peer(dev, unit, device);
1504         if (ret && allocated_netdev) {
1505                 unregister_netdev(net);
1506                 list_del(&dev->dev_link);
1507  out:
1508                 fwnet_fifo_stop(dev);
1509                 free_netdev(net);
1510         }
1511 
1512         mutex_unlock(&fwnet_device_mutex);
1513 
1514         return ret;
1515 }
1516 
1517 /*
1518  * FIXME abort partially sent fragmented datagrams,
1519  * discard partially received fragmented datagrams
1520  */
1521 static void fwnet_update(struct fw_unit *unit)
1522 {
1523         struct fw_device *device = fw_parent_device(unit);
1524         struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1525         int generation;
1526 
1527         generation = device->generation;
1528 
1529         spin_lock_irq(&peer->dev->lock);
1530         peer->node_id    = device->node_id;
1531         peer->generation = generation;
1532         spin_unlock_irq(&peer->dev->lock);
1533 }
1534 
1535 static void fwnet_remove_peer(struct fwnet_peer *peer, struct fwnet_device *dev)
1536 {
1537         struct fwnet_partial_datagram *pd, *pd_next;
1538 
1539         spin_lock_irq(&dev->lock);
1540         list_del(&peer->peer_link);
1541         dev->peer_count--;
1542         set_carrier_state(dev);
1543         spin_unlock_irq(&dev->lock);
1544 
1545         list_for_each_entry_safe(pd, pd_next, &peer->pd_list, pd_link)
1546                 fwnet_pd_delete(pd);
1547 
1548         kfree(peer);
1549 }
1550 
1551 static void fwnet_remove(struct fw_unit *unit)
1552 {
1553         struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1554         struct fwnet_device *dev = peer->dev;
1555         struct net_device *net;
1556         int i;
1557 
1558         mutex_lock(&fwnet_device_mutex);
1559 
1560         net = dev->netdev;
1561 
1562         fwnet_remove_peer(peer, dev);
1563 
1564         if (list_empty(&dev->peer_list)) {
1565                 unregister_netdev(net);
1566 
1567                 fwnet_fifo_stop(dev);
1568 
1569                 for (i = 0; dev->queued_datagrams && i < 5; i++)
1570                         ssleep(1);
1571                 WARN_ON(dev->queued_datagrams);
1572                 list_del(&dev->dev_link);
1573 
1574                 free_netdev(net);
1575         }
1576 
1577         mutex_unlock(&fwnet_device_mutex);
1578 }
1579 
1580 static const struct ieee1394_device_id fwnet_id_table[] = {
1581         {
1582                 .match_flags  = IEEE1394_MATCH_SPECIFIER_ID |
1583                                 IEEE1394_MATCH_VERSION,
1584                 .specifier_id = IANA_SPECIFIER_ID,
1585                 .version      = RFC2734_SW_VERSION,
1586         },
1587 #if IS_ENABLED(CONFIG_IPV6)
1588         {
1589                 .match_flags  = IEEE1394_MATCH_SPECIFIER_ID |
1590                                 IEEE1394_MATCH_VERSION,
1591                 .specifier_id = IANA_SPECIFIER_ID,
1592                 .version      = RFC3146_SW_VERSION,
1593         },
1594 #endif
1595         { }
1596 };
1597 
1598 static struct fw_driver fwnet_driver = {
1599         .driver = {
1600                 .owner  = THIS_MODULE,
1601                 .name   = KBUILD_MODNAME,
1602                 .bus    = &fw_bus_type,
1603         },
1604         .probe    = fwnet_probe,
1605         .update   = fwnet_update,
1606         .remove   = fwnet_remove,
1607         .id_table = fwnet_id_table,
1608 };
1609 
1610 static const u32 rfc2374_unit_directory_data[] = {
1611         0x00040000,     /* directory_length             */
1612         0x1200005e,     /* unit_specifier_id: IANA      */
1613         0x81000003,     /* textual descriptor offset    */
1614         0x13000001,     /* unit_sw_version: RFC 2734    */
1615         0x81000005,     /* textual descriptor offset    */
1616         0x00030000,     /* descriptor_length            */
1617         0x00000000,     /* text                         */
1618         0x00000000,     /* minimal ASCII, en            */
1619         0x49414e41,     /* I A N A                      */
1620         0x00030000,     /* descriptor_length            */
1621         0x00000000,     /* text                         */
1622         0x00000000,     /* minimal ASCII, en            */
1623         0x49507634,     /* I P v 4                      */
1624 };
1625 
1626 static struct fw_descriptor rfc2374_unit_directory = {
1627         .length = ARRAY_SIZE(rfc2374_unit_directory_data),
1628         .key    = (CSR_DIRECTORY | CSR_UNIT) << 24,
1629         .data   = rfc2374_unit_directory_data
1630 };
1631 
1632 #if IS_ENABLED(CONFIG_IPV6)
1633 static const u32 rfc3146_unit_directory_data[] = {
1634         0x00040000,     /* directory_length             */
1635         0x1200005e,     /* unit_specifier_id: IANA      */
1636         0x81000003,     /* textual descriptor offset    */
1637         0x13000002,     /* unit_sw_version: RFC 3146    */
1638         0x81000005,     /* textual descriptor offset    */
1639         0x00030000,     /* descriptor_length            */
1640         0x00000000,     /* text                         */
1641         0x00000000,     /* minimal ASCII, en            */
1642         0x49414e41,     /* I A N A                      */
1643         0x00030000,     /* descriptor_length            */
1644         0x00000000,     /* text                         */
1645         0x00000000,     /* minimal ASCII, en            */
1646         0x49507636,     /* I P v 6                      */
1647 };
1648 
1649 static struct fw_descriptor rfc3146_unit_directory = {
1650         .length = ARRAY_SIZE(rfc3146_unit_directory_data),
1651         .key    = (CSR_DIRECTORY | CSR_UNIT) << 24,
1652         .data   = rfc3146_unit_directory_data
1653 };
1654 #endif
1655 
1656 static int __init fwnet_init(void)
1657 {
1658         int err;
1659 
1660         err = fw_core_add_descriptor(&rfc2374_unit_directory);
1661         if (err)
1662                 return err;
1663 
1664 #if IS_ENABLED(CONFIG_IPV6)
1665         err = fw_core_add_descriptor(&rfc3146_unit_directory);
1666         if (err)
1667                 goto out;
1668 #endif
1669 
1670         fwnet_packet_task_cache = kmem_cache_create("packet_task",
1671                         sizeof(struct fwnet_packet_task), 0, 0, NULL);
1672         if (!fwnet_packet_task_cache) {
1673                 err = -ENOMEM;
1674                 goto out2;
1675         }
1676 
1677         err = driver_register(&fwnet_driver.driver);
1678         if (!err)
1679                 return 0;
1680 
1681         kmem_cache_destroy(fwnet_packet_task_cache);
1682 out2:
1683 #if IS_ENABLED(CONFIG_IPV6)
1684         fw_core_remove_descriptor(&rfc3146_unit_directory);
1685 out:
1686 #endif
1687         fw_core_remove_descriptor(&rfc2374_unit_directory);
1688 
1689         return err;
1690 }
1691 module_init(fwnet_init);
1692 
1693 static void __exit fwnet_cleanup(void)
1694 {
1695         driver_unregister(&fwnet_driver.driver);
1696         kmem_cache_destroy(fwnet_packet_task_cache);
1697 #if IS_ENABLED(CONFIG_IPV6)
1698         fw_core_remove_descriptor(&rfc3146_unit_directory);
1699 #endif
1700         fw_core_remove_descriptor(&rfc2374_unit_directory);
1701 }
1702 module_exit(fwnet_cleanup);
1703 
1704 MODULE_AUTHOR("Jay Fenlason <fenlason@redhat.com>");
1705 MODULE_DESCRIPTION("IP over IEEE1394 as per RFC 2734/3146");
1706 MODULE_LICENSE("GPL");
1707 MODULE_DEVICE_TABLE(ieee1394, fwnet_id_table);
1708 

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