Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

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) + 1)
 77 #define fwnet_get_hdr_fg_off(h)         (((h)->w0 & 0x00000fff))
 78 #define fwnet_get_hdr_dgl(h)            (((h)->w1 & 0xffff0000) >> 16)
 79 
 80 #define fwnet_set_hdr_lf(lf)            ((lf) << 30)
 81 #define fwnet_set_hdr_ether_type(et)    (et)
 82 #define fwnet_set_hdr_dg_size(dgs)      (((dgs) - 1) << 16)
 83 #define fwnet_set_hdr_fg_off(fgo)       (fgo)
 84 
 85 #define fwnet_set_hdr_dgl(dgl)          ((dgl) << 16)
 86 
 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         if (len <= RFC2374_UNFRAG_HDR_SIZE)
582                 return 0;
583 
584         hdr.w0 = be32_to_cpu(buf[0]);
585         lf = fwnet_get_hdr_lf(&hdr);
586         if (lf == RFC2374_HDR_UNFRAG) {
587                 /*
588                  * An unfragmented datagram has been received by the ieee1394
589                  * bus. Build an skbuff around it so we can pass it to the
590                  * high level network layer.
591                  */
592                 ether_type = fwnet_get_hdr_ether_type(&hdr);
593                 buf++;
594                 len -= RFC2374_UNFRAG_HDR_SIZE;
595 
596                 skb = dev_alloc_skb(len + LL_RESERVED_SPACE(net));
597                 if (unlikely(!skb)) {
598                         net->stats.rx_dropped++;
599 
600                         return -ENOMEM;
601                 }
602                 skb_reserve(skb, LL_RESERVED_SPACE(net));
603                 memcpy(skb_put(skb, len), buf, len);
604 
605                 return fwnet_finish_incoming_packet(net, skb, source_node_id,
606                                                     is_broadcast, ether_type);
607         }
608 
609         /* A datagram fragment has been received, now the fun begins. */
610 
611         if (len <= RFC2374_FRAG_HDR_SIZE)
612                 return 0;
613 
614         hdr.w1 = ntohl(buf[1]);
615         buf += 2;
616         len -= RFC2374_FRAG_HDR_SIZE;
617         if (lf == RFC2374_HDR_FIRSTFRAG) {
618                 ether_type = fwnet_get_hdr_ether_type(&hdr);
619                 fg_off = 0;
620         } else {
621                 ether_type = 0;
622                 fg_off = fwnet_get_hdr_fg_off(&hdr);
623         }
624         datagram_label = fwnet_get_hdr_dgl(&hdr);
625         dg_size = fwnet_get_hdr_dg_size(&hdr);
626 
627         if (fg_off + len > dg_size)
628                 return 0;
629 
630         spin_lock_irqsave(&dev->lock, flags);
631 
632         peer = fwnet_peer_find_by_node_id(dev, source_node_id, generation);
633         if (!peer) {
634                 retval = -ENOENT;
635                 goto fail;
636         }
637 
638         pd = fwnet_pd_find(peer, datagram_label);
639         if (pd == NULL) {
640                 while (peer->pdg_size >= FWNET_MAX_FRAGMENTS) {
641                         /* remove the oldest */
642                         fwnet_pd_delete(list_first_entry(&peer->pd_list,
643                                 struct fwnet_partial_datagram, pd_link));
644                         peer->pdg_size--;
645                 }
646                 pd = fwnet_pd_new(net, peer, datagram_label,
647                                   dg_size, buf, fg_off, len);
648                 if (pd == NULL) {
649                         retval = -ENOMEM;
650                         goto fail;
651                 }
652                 peer->pdg_size++;
653         } else {
654                 if (fwnet_frag_overlap(pd, fg_off, len) ||
655                     pd->datagram_size != dg_size) {
656                         /*
657                          * Differing datagram sizes or overlapping fragments,
658                          * discard old datagram and start a new one.
659                          */
660                         fwnet_pd_delete(pd);
661                         pd = fwnet_pd_new(net, peer, datagram_label,
662                                           dg_size, buf, fg_off, len);
663                         if (pd == NULL) {
664                                 peer->pdg_size--;
665                                 retval = -ENOMEM;
666                                 goto fail;
667                         }
668                 } else {
669                         if (!fwnet_pd_update(peer, pd, buf, fg_off, len)) {
670                                 /*
671                                  * Couldn't save off fragment anyway
672                                  * so might as well obliterate the
673                                  * datagram now.
674                                  */
675                                 fwnet_pd_delete(pd);
676                                 peer->pdg_size--;
677                                 retval = -ENOMEM;
678                                 goto fail;
679                         }
680                 }
681         } /* new datagram or add to existing one */
682 
683         if (lf == RFC2374_HDR_FIRSTFRAG)
684                 pd->ether_type = ether_type;
685 
686         if (fwnet_pd_is_complete(pd)) {
687                 ether_type = pd->ether_type;
688                 peer->pdg_size--;
689                 skb = skb_get(pd->skb);
690                 fwnet_pd_delete(pd);
691 
692                 spin_unlock_irqrestore(&dev->lock, flags);
693 
694                 return fwnet_finish_incoming_packet(net, skb, source_node_id,
695                                                     false, ether_type);
696         }
697         /*
698          * Datagram is not complete, we're done for the
699          * moment.
700          */
701         retval = 0;
702  fail:
703         spin_unlock_irqrestore(&dev->lock, flags);
704 
705         return retval;
706 }
707 
708 static void fwnet_receive_packet(struct fw_card *card, struct fw_request *r,
709                 int tcode, int destination, int source, int generation,
710                 unsigned long long offset, void *payload, size_t length,
711                 void *callback_data)
712 {
713         struct fwnet_device *dev = callback_data;
714         int rcode;
715 
716         if (destination == IEEE1394_ALL_NODES) {
717                 kfree(r);
718 
719                 return;
720         }
721 
722         if (offset != dev->handler.offset)
723                 rcode = RCODE_ADDRESS_ERROR;
724         else if (tcode != TCODE_WRITE_BLOCK_REQUEST)
725                 rcode = RCODE_TYPE_ERROR;
726         else if (fwnet_incoming_packet(dev, payload, length,
727                                        source, generation, false) != 0) {
728                 dev_err(&dev->netdev->dev, "incoming packet failure\n");
729                 rcode = RCODE_CONFLICT_ERROR;
730         } else
731                 rcode = RCODE_COMPLETE;
732 
733         fw_send_response(card, r, rcode);
734 }
735 
736 static int gasp_source_id(__be32 *p)
737 {
738         return be32_to_cpu(p[0]) >> 16;
739 }
740 
741 static u32 gasp_specifier_id(__be32 *p)
742 {
743         return (be32_to_cpu(p[0]) & 0xffff) << 8 |
744                (be32_to_cpu(p[1]) & 0xff000000) >> 24;
745 }
746 
747 static u32 gasp_version(__be32 *p)
748 {
749         return be32_to_cpu(p[1]) & 0xffffff;
750 }
751 
752 static void fwnet_receive_broadcast(struct fw_iso_context *context,
753                 u32 cycle, size_t header_length, void *header, void *data)
754 {
755         struct fwnet_device *dev;
756         struct fw_iso_packet packet;
757         __be16 *hdr_ptr;
758         __be32 *buf_ptr;
759         int retval;
760         u32 length;
761         unsigned long offset;
762         unsigned long flags;
763 
764         dev = data;
765         hdr_ptr = header;
766         length = be16_to_cpup(hdr_ptr);
767 
768         spin_lock_irqsave(&dev->lock, flags);
769 
770         offset = dev->rcv_buffer_size * dev->broadcast_rcv_next_ptr;
771         buf_ptr = dev->broadcast_rcv_buffer_ptrs[dev->broadcast_rcv_next_ptr++];
772         if (dev->broadcast_rcv_next_ptr == dev->num_broadcast_rcv_ptrs)
773                 dev->broadcast_rcv_next_ptr = 0;
774 
775         spin_unlock_irqrestore(&dev->lock, flags);
776 
777         if (length > IEEE1394_GASP_HDR_SIZE &&
778             gasp_specifier_id(buf_ptr) == IANA_SPECIFIER_ID &&
779             (gasp_version(buf_ptr) == RFC2734_SW_VERSION
780 #if IS_ENABLED(CONFIG_IPV6)
781              || gasp_version(buf_ptr) == RFC3146_SW_VERSION
782 #endif
783             ))
784                 fwnet_incoming_packet(dev, buf_ptr + 2,
785                                       length - IEEE1394_GASP_HDR_SIZE,
786                                       gasp_source_id(buf_ptr),
787                                       context->card->generation, true);
788 
789         packet.payload_length = dev->rcv_buffer_size;
790         packet.interrupt = 1;
791         packet.skip = 0;
792         packet.tag = 3;
793         packet.sy = 0;
794         packet.header_length = IEEE1394_GASP_HDR_SIZE;
795 
796         spin_lock_irqsave(&dev->lock, flags);
797 
798         retval = fw_iso_context_queue(dev->broadcast_rcv_context, &packet,
799                                       &dev->broadcast_rcv_buffer, offset);
800 
801         spin_unlock_irqrestore(&dev->lock, flags);
802 
803         if (retval >= 0)
804                 fw_iso_context_queue_flush(dev->broadcast_rcv_context);
805         else
806                 dev_err(&dev->netdev->dev, "requeue failed\n");
807 }
808 
809 static struct kmem_cache *fwnet_packet_task_cache;
810 
811 static void fwnet_free_ptask(struct fwnet_packet_task *ptask)
812 {
813         dev_kfree_skb_any(ptask->skb);
814         kmem_cache_free(fwnet_packet_task_cache, ptask);
815 }
816 
817 /* Caller must hold dev->lock. */
818 static void dec_queued_datagrams(struct fwnet_device *dev)
819 {
820         if (--dev->queued_datagrams == FWNET_MIN_QUEUED_DATAGRAMS)
821                 netif_wake_queue(dev->netdev);
822 }
823 
824 static int fwnet_send_packet(struct fwnet_packet_task *ptask);
825 
826 static void fwnet_transmit_packet_done(struct fwnet_packet_task *ptask)
827 {
828         struct fwnet_device *dev = ptask->dev;
829         struct sk_buff *skb = ptask->skb;
830         unsigned long flags;
831         bool free;
832 
833         spin_lock_irqsave(&dev->lock, flags);
834 
835         ptask->outstanding_pkts--;
836 
837         /* Check whether we or the networking TX soft-IRQ is last user. */
838         free = (ptask->outstanding_pkts == 0 && ptask->enqueued);
839         if (free)
840                 dec_queued_datagrams(dev);
841 
842         if (ptask->outstanding_pkts == 0) {
843                 dev->netdev->stats.tx_packets++;
844                 dev->netdev->stats.tx_bytes += skb->len;
845         }
846 
847         spin_unlock_irqrestore(&dev->lock, flags);
848 
849         if (ptask->outstanding_pkts > 0) {
850                 u16 dg_size;
851                 u16 fg_off;
852                 u16 datagram_label;
853                 u16 lf;
854 
855                 /* Update the ptask to point to the next fragment and send it */
856                 lf = fwnet_get_hdr_lf(&ptask->hdr);
857                 switch (lf) {
858                 case RFC2374_HDR_LASTFRAG:
859                 case RFC2374_HDR_UNFRAG:
860                 default:
861                         dev_err(&dev->netdev->dev,
862                                 "outstanding packet %x lf %x, header %x,%x\n",
863                                 ptask->outstanding_pkts, lf, ptask->hdr.w0,
864                                 ptask->hdr.w1);
865                         BUG();
866 
867                 case RFC2374_HDR_FIRSTFRAG:
868                         /* Set frag type here for future interior fragments */
869                         dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
870                         fg_off = ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
871                         datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
872                         break;
873 
874                 case RFC2374_HDR_INTFRAG:
875                         dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
876                         fg_off = fwnet_get_hdr_fg_off(&ptask->hdr)
877                                   + ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
878                         datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
879                         break;
880                 }
881 
882                 if (ptask->dest_node == IEEE1394_ALL_NODES) {
883                         skb_pull(skb,
884                                  ptask->max_payload + IEEE1394_GASP_HDR_SIZE);
885                 } else {
886                         skb_pull(skb, ptask->max_payload);
887                 }
888                 if (ptask->outstanding_pkts > 1) {
889                         fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_INTFRAG,
890                                           dg_size, fg_off, datagram_label);
891                 } else {
892                         fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_LASTFRAG,
893                                           dg_size, fg_off, datagram_label);
894                         ptask->max_payload = skb->len + RFC2374_FRAG_HDR_SIZE;
895                 }
896                 fwnet_send_packet(ptask);
897         }
898 
899         if (free)
900                 fwnet_free_ptask(ptask);
901 }
902 
903 static void fwnet_transmit_packet_failed(struct fwnet_packet_task *ptask)
904 {
905         struct fwnet_device *dev = ptask->dev;
906         unsigned long flags;
907         bool free;
908 
909         spin_lock_irqsave(&dev->lock, flags);
910 
911         /* One fragment failed; don't try to send remaining fragments. */
912         ptask->outstanding_pkts = 0;
913 
914         /* Check whether we or the networking TX soft-IRQ is last user. */
915         free = ptask->enqueued;
916         if (free)
917                 dec_queued_datagrams(dev);
918 
919         dev->netdev->stats.tx_dropped++;
920         dev->netdev->stats.tx_errors++;
921 
922         spin_unlock_irqrestore(&dev->lock, flags);
923 
924         if (free)
925                 fwnet_free_ptask(ptask);
926 }
927 
928 static void fwnet_write_complete(struct fw_card *card, int rcode,
929                                  void *payload, size_t length, void *data)
930 {
931         struct fwnet_packet_task *ptask = data;
932         static unsigned long j;
933         static int last_rcode, errors_skipped;
934 
935         if (rcode == RCODE_COMPLETE) {
936                 fwnet_transmit_packet_done(ptask);
937         } else {
938                 if (printk_timed_ratelimit(&j,  1000) || rcode != last_rcode) {
939                         dev_err(&ptask->dev->netdev->dev,
940                                 "fwnet_write_complete failed: %x (skipped %d)\n",
941                                 rcode, errors_skipped);
942 
943                         errors_skipped = 0;
944                         last_rcode = rcode;
945                 } else {
946                         errors_skipped++;
947                 }
948                 fwnet_transmit_packet_failed(ptask);
949         }
950 }
951 
952 static int fwnet_send_packet(struct fwnet_packet_task *ptask)
953 {
954         struct fwnet_device *dev;
955         unsigned tx_len;
956         struct rfc2734_header *bufhdr;
957         unsigned long flags;
958         bool free;
959 
960         dev = ptask->dev;
961         tx_len = ptask->max_payload;
962         switch (fwnet_get_hdr_lf(&ptask->hdr)) {
963         case RFC2374_HDR_UNFRAG:
964                 bufhdr = (struct rfc2734_header *)
965                                 skb_push(ptask->skb, RFC2374_UNFRAG_HDR_SIZE);
966                 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
967                 break;
968 
969         case RFC2374_HDR_FIRSTFRAG:
970         case RFC2374_HDR_INTFRAG:
971         case RFC2374_HDR_LASTFRAG:
972                 bufhdr = (struct rfc2734_header *)
973                                 skb_push(ptask->skb, RFC2374_FRAG_HDR_SIZE);
974                 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
975                 put_unaligned_be32(ptask->hdr.w1, &bufhdr->w1);
976                 break;
977 
978         default:
979                 BUG();
980         }
981         if (ptask->dest_node == IEEE1394_ALL_NODES) {
982                 u8 *p;
983                 int generation;
984                 int node_id;
985                 unsigned int sw_version;
986 
987                 /* ptask->generation may not have been set yet */
988                 generation = dev->card->generation;
989                 smp_rmb();
990                 node_id = dev->card->node_id;
991 
992                 switch (ptask->skb->protocol) {
993                 default:
994                         sw_version = RFC2734_SW_VERSION;
995                         break;
996 #if IS_ENABLED(CONFIG_IPV6)
997                 case htons(ETH_P_IPV6):
998                         sw_version = RFC3146_SW_VERSION;
999 #endif
1000                 }
1001 
1002                 p = skb_push(ptask->skb, IEEE1394_GASP_HDR_SIZE);
1003                 put_unaligned_be32(node_id << 16 | IANA_SPECIFIER_ID >> 8, p);
1004                 put_unaligned_be32((IANA_SPECIFIER_ID & 0xff) << 24
1005                                                 | sw_version, &p[4]);
1006 
1007                 /* We should not transmit if broadcast_channel.valid == 0. */
1008                 fw_send_request(dev->card, &ptask->transaction,
1009                                 TCODE_STREAM_DATA,
1010                                 fw_stream_packet_destination_id(3,
1011                                                 IEEE1394_BROADCAST_CHANNEL, 0),
1012                                 generation, SCODE_100, 0ULL, ptask->skb->data,
1013                                 tx_len + 8, fwnet_write_complete, ptask);
1014 
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                 goto out;
1027         }
1028 
1029         fw_send_request(dev->card, &ptask->transaction,
1030                         TCODE_WRITE_BLOCK_REQUEST, ptask->dest_node,
1031                         ptask->generation, ptask->speed, ptask->fifo_addr,
1032                         ptask->skb->data, tx_len, fwnet_write_complete, ptask);
1033 
1034         spin_lock_irqsave(&dev->lock, flags);
1035 
1036         /* If the AT tasklet already ran, we may be last user. */
1037         free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1038         if (!free)
1039                 ptask->enqueued = true;
1040         else
1041                 dec_queued_datagrams(dev);
1042 
1043         spin_unlock_irqrestore(&dev->lock, flags);
1044 
1045         netif_trans_update(dev->netdev);
1046  out:
1047         if (free)
1048                 fwnet_free_ptask(ptask);
1049 
1050         return 0;
1051 }
1052 
1053 static void fwnet_fifo_stop(struct fwnet_device *dev)
1054 {
1055         if (dev->local_fifo == FWNET_NO_FIFO_ADDR)
1056                 return;
1057 
1058         fw_core_remove_address_handler(&dev->handler);
1059         dev->local_fifo = FWNET_NO_FIFO_ADDR;
1060 }
1061 
1062 static int fwnet_fifo_start(struct fwnet_device *dev)
1063 {
1064         int retval;
1065 
1066         if (dev->local_fifo != FWNET_NO_FIFO_ADDR)
1067                 return 0;
1068 
1069         dev->handler.length = 4096;
1070         dev->handler.address_callback = fwnet_receive_packet;
1071         dev->handler.callback_data = dev;
1072 
1073         retval = fw_core_add_address_handler(&dev->handler,
1074                                              &fw_high_memory_region);
1075         if (retval < 0)
1076                 return retval;
1077 
1078         dev->local_fifo = dev->handler.offset;
1079 
1080         return 0;
1081 }
1082 
1083 static void __fwnet_broadcast_stop(struct fwnet_device *dev)
1084 {
1085         unsigned u;
1086 
1087         if (dev->broadcast_state != FWNET_BROADCAST_ERROR) {
1088                 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++)
1089                         kunmap(dev->broadcast_rcv_buffer.pages[u]);
1090                 fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer, dev->card);
1091         }
1092         if (dev->broadcast_rcv_context) {
1093                 fw_iso_context_destroy(dev->broadcast_rcv_context);
1094                 dev->broadcast_rcv_context = NULL;
1095         }
1096         kfree(dev->broadcast_rcv_buffer_ptrs);
1097         dev->broadcast_rcv_buffer_ptrs = NULL;
1098         dev->broadcast_state = FWNET_BROADCAST_ERROR;
1099 }
1100 
1101 static void fwnet_broadcast_stop(struct fwnet_device *dev)
1102 {
1103         if (dev->broadcast_state == FWNET_BROADCAST_ERROR)
1104                 return;
1105         fw_iso_context_stop(dev->broadcast_rcv_context);
1106         __fwnet_broadcast_stop(dev);
1107 }
1108 
1109 static int fwnet_broadcast_start(struct fwnet_device *dev)
1110 {
1111         struct fw_iso_context *context;
1112         int retval;
1113         unsigned num_packets;
1114         unsigned max_receive;
1115         struct fw_iso_packet packet;
1116         unsigned long offset;
1117         void **ptrptr;
1118         unsigned u;
1119 
1120         if (dev->broadcast_state != FWNET_BROADCAST_ERROR)
1121                 return 0;
1122 
1123         max_receive = 1U << (dev->card->max_receive + 1);
1124         num_packets = (FWNET_ISO_PAGE_COUNT * PAGE_SIZE) / max_receive;
1125 
1126         ptrptr = kmalloc(sizeof(void *) * num_packets, GFP_KERNEL);
1127         if (!ptrptr) {
1128                 retval = -ENOMEM;
1129                 goto failed;
1130         }
1131         dev->broadcast_rcv_buffer_ptrs = ptrptr;
1132 
1133         context = fw_iso_context_create(dev->card, FW_ISO_CONTEXT_RECEIVE,
1134                                         IEEE1394_BROADCAST_CHANNEL,
1135                                         dev->card->link_speed, 8,
1136                                         fwnet_receive_broadcast, dev);
1137         if (IS_ERR(context)) {
1138                 retval = PTR_ERR(context);
1139                 goto failed;
1140         }
1141 
1142         retval = fw_iso_buffer_init(&dev->broadcast_rcv_buffer, dev->card,
1143                                     FWNET_ISO_PAGE_COUNT, DMA_FROM_DEVICE);
1144         if (retval < 0)
1145                 goto failed;
1146 
1147         dev->broadcast_state = FWNET_BROADCAST_STOPPED;
1148 
1149         for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++) {
1150                 void *ptr;
1151                 unsigned v;
1152 
1153                 ptr = kmap(dev->broadcast_rcv_buffer.pages[u]);
1154                 for (v = 0; v < num_packets / FWNET_ISO_PAGE_COUNT; v++)
1155                         *ptrptr++ = (void *) ((char *)ptr + v * max_receive);
1156         }
1157         dev->broadcast_rcv_context = context;
1158 
1159         packet.payload_length = max_receive;
1160         packet.interrupt = 1;
1161         packet.skip = 0;
1162         packet.tag = 3;
1163         packet.sy = 0;
1164         packet.header_length = IEEE1394_GASP_HDR_SIZE;
1165         offset = 0;
1166 
1167         for (u = 0; u < num_packets; u++) {
1168                 retval = fw_iso_context_queue(context, &packet,
1169                                 &dev->broadcast_rcv_buffer, offset);
1170                 if (retval < 0)
1171                         goto failed;
1172 
1173                 offset += max_receive;
1174         }
1175         dev->num_broadcast_rcv_ptrs = num_packets;
1176         dev->rcv_buffer_size = max_receive;
1177         dev->broadcast_rcv_next_ptr = 0U;
1178         retval = fw_iso_context_start(context, -1, 0,
1179                         FW_ISO_CONTEXT_MATCH_ALL_TAGS); /* ??? sync */
1180         if (retval < 0)
1181                 goto failed;
1182 
1183         /* FIXME: adjust it according to the min. speed of all known peers? */
1184         dev->broadcast_xmt_max_payload = IEEE1394_MAX_PAYLOAD_S100
1185                         - IEEE1394_GASP_HDR_SIZE - RFC2374_UNFRAG_HDR_SIZE;
1186         dev->broadcast_state = FWNET_BROADCAST_RUNNING;
1187 
1188         return 0;
1189 
1190  failed:
1191         __fwnet_broadcast_stop(dev);
1192         return retval;
1193 }
1194 
1195 static void set_carrier_state(struct fwnet_device *dev)
1196 {
1197         if (dev->peer_count > 1)
1198                 netif_carrier_on(dev->netdev);
1199         else
1200                 netif_carrier_off(dev->netdev);
1201 }
1202 
1203 /* ifup */
1204 static int fwnet_open(struct net_device *net)
1205 {
1206         struct fwnet_device *dev = netdev_priv(net);
1207         int ret;
1208 
1209         ret = fwnet_broadcast_start(dev);
1210         if (ret)
1211                 return ret;
1212 
1213         netif_start_queue(net);
1214 
1215         spin_lock_irq(&dev->lock);
1216         set_carrier_state(dev);
1217         spin_unlock_irq(&dev->lock);
1218 
1219         return 0;
1220 }
1221 
1222 /* ifdown */
1223 static int fwnet_stop(struct net_device *net)
1224 {
1225         struct fwnet_device *dev = netdev_priv(net);
1226 
1227         netif_stop_queue(net);
1228         fwnet_broadcast_stop(dev);
1229 
1230         return 0;
1231 }
1232 
1233 static netdev_tx_t fwnet_tx(struct sk_buff *skb, struct net_device *net)
1234 {
1235         struct fwnet_header hdr_buf;
1236         struct fwnet_device *dev = netdev_priv(net);
1237         __be16 proto;
1238         u16 dest_node;
1239         unsigned max_payload;
1240         u16 dg_size;
1241         u16 *datagram_label_ptr;
1242         struct fwnet_packet_task *ptask;
1243         struct fwnet_peer *peer;
1244         unsigned long flags;
1245 
1246         spin_lock_irqsave(&dev->lock, flags);
1247 
1248         /* Can this happen? */
1249         if (netif_queue_stopped(dev->netdev)) {
1250                 spin_unlock_irqrestore(&dev->lock, flags);
1251 
1252                 return NETDEV_TX_BUSY;
1253         }
1254 
1255         ptask = kmem_cache_alloc(fwnet_packet_task_cache, GFP_ATOMIC);
1256         if (ptask == NULL)
1257                 goto fail;
1258 
1259         skb = skb_share_check(skb, GFP_ATOMIC);
1260         if (!skb)
1261                 goto fail;
1262 
1263         /*
1264          * Make a copy of the driver-specific header.
1265          * We might need to rebuild the header on tx failure.
1266          */
1267         memcpy(&hdr_buf, skb->data, sizeof(hdr_buf));
1268         proto = hdr_buf.h_proto;
1269 
1270         switch (proto) {
1271         case htons(ETH_P_ARP):
1272         case htons(ETH_P_IP):
1273 #if IS_ENABLED(CONFIG_IPV6)
1274         case htons(ETH_P_IPV6):
1275 #endif
1276                 break;
1277         default:
1278                 goto fail;
1279         }
1280 
1281         skb_pull(skb, sizeof(hdr_buf));
1282         dg_size = skb->len;
1283 
1284         /*
1285          * Set the transmission type for the packet.  ARP packets and IP
1286          * broadcast packets are sent via GASP.
1287          */
1288         if (fwnet_hwaddr_is_multicast(hdr_buf.h_dest)) {
1289                 max_payload        = dev->broadcast_xmt_max_payload;
1290                 datagram_label_ptr = &dev->broadcast_xmt_datagramlabel;
1291 
1292                 ptask->fifo_addr   = FWNET_NO_FIFO_ADDR;
1293                 ptask->generation  = 0;
1294                 ptask->dest_node   = IEEE1394_ALL_NODES;
1295                 ptask->speed       = SCODE_100;
1296         } else {
1297                 union fwnet_hwaddr *ha = (union fwnet_hwaddr *)hdr_buf.h_dest;
1298                 __be64 guid = get_unaligned(&ha->uc.uniq_id);
1299                 u8 generation;
1300 
1301                 peer = fwnet_peer_find_by_guid(dev, be64_to_cpu(guid));
1302                 if (!peer)
1303                         goto fail;
1304 
1305                 generation         = peer->generation;
1306                 dest_node          = peer->node_id;
1307                 max_payload        = peer->max_payload;
1308                 datagram_label_ptr = &peer->datagram_label;
1309 
1310                 ptask->fifo_addr   = fwnet_hwaddr_fifo(ha);
1311                 ptask->generation  = generation;
1312                 ptask->dest_node   = dest_node;
1313                 ptask->speed       = peer->speed;
1314         }
1315 
1316         ptask->hdr.w0 = 0;
1317         ptask->hdr.w1 = 0;
1318         ptask->skb = skb;
1319         ptask->dev = dev;
1320 
1321         /* Does it all fit in one packet? */
1322         if (dg_size <= max_payload) {
1323                 fwnet_make_uf_hdr(&ptask->hdr, ntohs(proto));
1324                 ptask->outstanding_pkts = 1;
1325                 max_payload = dg_size + RFC2374_UNFRAG_HDR_SIZE;
1326         } else {
1327                 u16 datagram_label;
1328 
1329                 max_payload -= RFC2374_FRAG_OVERHEAD;
1330                 datagram_label = (*datagram_label_ptr)++;
1331                 fwnet_make_ff_hdr(&ptask->hdr, ntohs(proto), dg_size,
1332                                   datagram_label);
1333                 ptask->outstanding_pkts = DIV_ROUND_UP(dg_size, max_payload);
1334                 max_payload += RFC2374_FRAG_HDR_SIZE;
1335         }
1336 
1337         if (++dev->queued_datagrams == FWNET_MAX_QUEUED_DATAGRAMS)
1338                 netif_stop_queue(dev->netdev);
1339 
1340         spin_unlock_irqrestore(&dev->lock, flags);
1341 
1342         ptask->max_payload = max_payload;
1343         ptask->enqueued    = 0;
1344 
1345         fwnet_send_packet(ptask);
1346 
1347         return NETDEV_TX_OK;
1348 
1349  fail:
1350         spin_unlock_irqrestore(&dev->lock, flags);
1351 
1352         if (ptask)
1353                 kmem_cache_free(fwnet_packet_task_cache, ptask);
1354 
1355         if (skb != NULL)
1356                 dev_kfree_skb(skb);
1357 
1358         net->stats.tx_dropped++;
1359         net->stats.tx_errors++;
1360 
1361         /*
1362          * FIXME: According to a patch from 2003-02-26, "returning non-zero
1363          * causes serious problems" here, allegedly.  Before that patch,
1364          * -ERRNO was returned which is not appropriate under Linux 2.6.
1365          * Perhaps more needs to be done?  Stop the queue in serious
1366          * conditions and restart it elsewhere?
1367          */
1368         return NETDEV_TX_OK;
1369 }
1370 
1371 static const struct ethtool_ops fwnet_ethtool_ops = {
1372         .get_link       = ethtool_op_get_link,
1373 };
1374 
1375 static const struct net_device_ops fwnet_netdev_ops = {
1376         .ndo_open       = fwnet_open,
1377         .ndo_stop       = fwnet_stop,
1378         .ndo_start_xmit = fwnet_tx,
1379 };
1380 
1381 static void fwnet_init_dev(struct net_device *net)
1382 {
1383         net->header_ops         = &fwnet_header_ops;
1384         net->netdev_ops         = &fwnet_netdev_ops;
1385         net->watchdog_timeo     = 2 * HZ;
1386         net->flags              = IFF_BROADCAST | IFF_MULTICAST;
1387         net->features           = NETIF_F_HIGHDMA;
1388         net->addr_len           = FWNET_ALEN;
1389         net->hard_header_len    = FWNET_HLEN;
1390         net->type               = ARPHRD_IEEE1394;
1391         net->tx_queue_len       = FWNET_TX_QUEUE_LEN;
1392         net->ethtool_ops        = &fwnet_ethtool_ops;
1393 }
1394 
1395 /* caller must hold fwnet_device_mutex */
1396 static struct fwnet_device *fwnet_dev_find(struct fw_card *card)
1397 {
1398         struct fwnet_device *dev;
1399 
1400         list_for_each_entry(dev, &fwnet_device_list, dev_link)
1401                 if (dev->card == card)
1402                         return dev;
1403 
1404         return NULL;
1405 }
1406 
1407 static int fwnet_add_peer(struct fwnet_device *dev,
1408                           struct fw_unit *unit, struct fw_device *device)
1409 {
1410         struct fwnet_peer *peer;
1411 
1412         peer = kmalloc(sizeof(*peer), GFP_KERNEL);
1413         if (!peer)
1414                 return -ENOMEM;
1415 
1416         dev_set_drvdata(&unit->device, peer);
1417 
1418         peer->dev = dev;
1419         peer->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4];
1420         INIT_LIST_HEAD(&peer->pd_list);
1421         peer->pdg_size = 0;
1422         peer->datagram_label = 0;
1423         peer->speed = device->max_speed;
1424         peer->max_payload = fwnet_max_payload(device->max_rec, peer->speed);
1425 
1426         peer->generation = device->generation;
1427         smp_rmb();
1428         peer->node_id = device->node_id;
1429 
1430         spin_lock_irq(&dev->lock);
1431         list_add_tail(&peer->peer_link, &dev->peer_list);
1432         dev->peer_count++;
1433         set_carrier_state(dev);
1434         spin_unlock_irq(&dev->lock);
1435 
1436         return 0;
1437 }
1438 
1439 static int fwnet_probe(struct fw_unit *unit,
1440                        const struct ieee1394_device_id *id)
1441 {
1442         struct fw_device *device = fw_parent_device(unit);
1443         struct fw_card *card = device->card;
1444         struct net_device *net;
1445         bool allocated_netdev = false;
1446         struct fwnet_device *dev;
1447         int ret;
1448         union fwnet_hwaddr *ha;
1449 
1450         mutex_lock(&fwnet_device_mutex);
1451 
1452         dev = fwnet_dev_find(card);
1453         if (dev) {
1454                 net = dev->netdev;
1455                 goto have_dev;
1456         }
1457 
1458         net = alloc_netdev(sizeof(*dev), "firewire%d", NET_NAME_UNKNOWN,
1459                            fwnet_init_dev);
1460         if (net == NULL) {
1461                 mutex_unlock(&fwnet_device_mutex);
1462                 return -ENOMEM;
1463         }
1464 
1465         allocated_netdev = true;
1466         SET_NETDEV_DEV(net, card->device);
1467         dev = netdev_priv(net);
1468 
1469         spin_lock_init(&dev->lock);
1470         dev->broadcast_state = FWNET_BROADCAST_ERROR;
1471         dev->broadcast_rcv_context = NULL;
1472         dev->broadcast_xmt_max_payload = 0;
1473         dev->broadcast_xmt_datagramlabel = 0;
1474         dev->local_fifo = FWNET_NO_FIFO_ADDR;
1475         dev->queued_datagrams = 0;
1476         INIT_LIST_HEAD(&dev->peer_list);
1477         dev->card = card;
1478         dev->netdev = net;
1479 
1480         ret = fwnet_fifo_start(dev);
1481         if (ret < 0)
1482                 goto out;
1483         dev->local_fifo = dev->handler.offset;
1484 
1485         net->mtu = 1500U;
1486         net->min_mtu = ETH_MIN_MTU;
1487         net->max_mtu = 0xfff;
1488 
1489         /* Set our hardware address while we're at it */
1490         ha = (union fwnet_hwaddr *)net->dev_addr;
1491         put_unaligned_be64(card->guid, &ha->uc.uniq_id);
1492         ha->uc.max_rec = dev->card->max_receive;
1493         ha->uc.sspd = dev->card->link_speed;
1494         put_unaligned_be16(dev->local_fifo >> 32, &ha->uc.fifo_hi);
1495         put_unaligned_be32(dev->local_fifo & 0xffffffff, &ha->uc.fifo_lo);
1496 
1497         memset(net->broadcast, -1, net->addr_len);
1498 
1499         ret = register_netdev(net);
1500         if (ret)
1501                 goto out;
1502 
1503         list_add_tail(&dev->dev_link, &fwnet_device_list);
1504         dev_notice(&net->dev, "IP over IEEE 1394 on card %s\n",
1505                    dev_name(card->device));
1506  have_dev:
1507         ret = fwnet_add_peer(dev, unit, device);
1508         if (ret && allocated_netdev) {
1509                 unregister_netdev(net);
1510                 list_del(&dev->dev_link);
1511  out:
1512                 fwnet_fifo_stop(dev);
1513                 free_netdev(net);
1514         }
1515 
1516         mutex_unlock(&fwnet_device_mutex);
1517 
1518         return ret;
1519 }
1520 
1521 /*
1522  * FIXME abort partially sent fragmented datagrams,
1523  * discard partially received fragmented datagrams
1524  */
1525 static void fwnet_update(struct fw_unit *unit)
1526 {
1527         struct fw_device *device = fw_parent_device(unit);
1528         struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1529         int generation;
1530 
1531         generation = device->generation;
1532 
1533         spin_lock_irq(&peer->dev->lock);
1534         peer->node_id    = device->node_id;
1535         peer->generation = generation;
1536         spin_unlock_irq(&peer->dev->lock);
1537 }
1538 
1539 static void fwnet_remove_peer(struct fwnet_peer *peer, struct fwnet_device *dev)
1540 {
1541         struct fwnet_partial_datagram *pd, *pd_next;
1542 
1543         spin_lock_irq(&dev->lock);
1544         list_del(&peer->peer_link);
1545         dev->peer_count--;
1546         set_carrier_state(dev);
1547         spin_unlock_irq(&dev->lock);
1548 
1549         list_for_each_entry_safe(pd, pd_next, &peer->pd_list, pd_link)
1550                 fwnet_pd_delete(pd);
1551 
1552         kfree(peer);
1553 }
1554 
1555 static void fwnet_remove(struct fw_unit *unit)
1556 {
1557         struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1558         struct fwnet_device *dev = peer->dev;
1559         struct net_device *net;
1560         int i;
1561 
1562         mutex_lock(&fwnet_device_mutex);
1563 
1564         net = dev->netdev;
1565 
1566         fwnet_remove_peer(peer, dev);
1567 
1568         if (list_empty(&dev->peer_list)) {
1569                 unregister_netdev(net);
1570 
1571                 fwnet_fifo_stop(dev);
1572 
1573                 for (i = 0; dev->queued_datagrams && i < 5; i++)
1574                         ssleep(1);
1575                 WARN_ON(dev->queued_datagrams);
1576                 list_del(&dev->dev_link);
1577 
1578                 free_netdev(net);
1579         }
1580 
1581         mutex_unlock(&fwnet_device_mutex);
1582 }
1583 
1584 static const struct ieee1394_device_id fwnet_id_table[] = {
1585         {
1586                 .match_flags  = IEEE1394_MATCH_SPECIFIER_ID |
1587                                 IEEE1394_MATCH_VERSION,
1588                 .specifier_id = IANA_SPECIFIER_ID,
1589                 .version      = RFC2734_SW_VERSION,
1590         },
1591 #if IS_ENABLED(CONFIG_IPV6)
1592         {
1593                 .match_flags  = IEEE1394_MATCH_SPECIFIER_ID |
1594                                 IEEE1394_MATCH_VERSION,
1595                 .specifier_id = IANA_SPECIFIER_ID,
1596                 .version      = RFC3146_SW_VERSION,
1597         },
1598 #endif
1599         { }
1600 };
1601 
1602 static struct fw_driver fwnet_driver = {
1603         .driver = {
1604                 .owner  = THIS_MODULE,
1605                 .name   = KBUILD_MODNAME,
1606                 .bus    = &fw_bus_type,
1607         },
1608         .probe    = fwnet_probe,
1609         .update   = fwnet_update,
1610         .remove   = fwnet_remove,
1611         .id_table = fwnet_id_table,
1612 };
1613 
1614 static const u32 rfc2374_unit_directory_data[] = {
1615         0x00040000,     /* directory_length             */
1616         0x1200005e,     /* unit_specifier_id: IANA      */
1617         0x81000003,     /* textual descriptor offset    */
1618         0x13000001,     /* unit_sw_version: RFC 2734    */
1619         0x81000005,     /* textual descriptor offset    */
1620         0x00030000,     /* descriptor_length            */
1621         0x00000000,     /* text                         */
1622         0x00000000,     /* minimal ASCII, en            */
1623         0x49414e41,     /* I A N A                      */
1624         0x00030000,     /* descriptor_length            */
1625         0x00000000,     /* text                         */
1626         0x00000000,     /* minimal ASCII, en            */
1627         0x49507634,     /* I P v 4                      */
1628 };
1629 
1630 static struct fw_descriptor rfc2374_unit_directory = {
1631         .length = ARRAY_SIZE(rfc2374_unit_directory_data),
1632         .key    = (CSR_DIRECTORY | CSR_UNIT) << 24,
1633         .data   = rfc2374_unit_directory_data
1634 };
1635 
1636 #if IS_ENABLED(CONFIG_IPV6)
1637 static const u32 rfc3146_unit_directory_data[] = {
1638         0x00040000,     /* directory_length             */
1639         0x1200005e,     /* unit_specifier_id: IANA      */
1640         0x81000003,     /* textual descriptor offset    */
1641         0x13000002,     /* unit_sw_version: RFC 3146    */
1642         0x81000005,     /* textual descriptor offset    */
1643         0x00030000,     /* descriptor_length            */
1644         0x00000000,     /* text                         */
1645         0x00000000,     /* minimal ASCII, en            */
1646         0x49414e41,     /* I A N A                      */
1647         0x00030000,     /* descriptor_length            */
1648         0x00000000,     /* text                         */
1649         0x00000000,     /* minimal ASCII, en            */
1650         0x49507636,     /* I P v 6                      */
1651 };
1652 
1653 static struct fw_descriptor rfc3146_unit_directory = {
1654         .length = ARRAY_SIZE(rfc3146_unit_directory_data),
1655         .key    = (CSR_DIRECTORY | CSR_UNIT) << 24,
1656         .data   = rfc3146_unit_directory_data
1657 };
1658 #endif
1659 
1660 static int __init fwnet_init(void)
1661 {
1662         int err;
1663 
1664         err = fw_core_add_descriptor(&rfc2374_unit_directory);
1665         if (err)
1666                 return err;
1667 
1668 #if IS_ENABLED(CONFIG_IPV6)
1669         err = fw_core_add_descriptor(&rfc3146_unit_directory);
1670         if (err)
1671                 goto out;
1672 #endif
1673 
1674         fwnet_packet_task_cache = kmem_cache_create("packet_task",
1675                         sizeof(struct fwnet_packet_task), 0, 0, NULL);
1676         if (!fwnet_packet_task_cache) {
1677                 err = -ENOMEM;
1678                 goto out2;
1679         }
1680 
1681         err = driver_register(&fwnet_driver.driver);
1682         if (!err)
1683                 return 0;
1684 
1685         kmem_cache_destroy(fwnet_packet_task_cache);
1686 out2:
1687 #if IS_ENABLED(CONFIG_IPV6)
1688         fw_core_remove_descriptor(&rfc3146_unit_directory);
1689 out:
1690 #endif
1691         fw_core_remove_descriptor(&rfc2374_unit_directory);
1692 
1693         return err;
1694 }
1695 module_init(fwnet_init);
1696 
1697 static void __exit fwnet_cleanup(void)
1698 {
1699         driver_unregister(&fwnet_driver.driver);
1700         kmem_cache_destroy(fwnet_packet_task_cache);
1701 #if IS_ENABLED(CONFIG_IPV6)
1702         fw_core_remove_descriptor(&rfc3146_unit_directory);
1703 #endif
1704         fw_core_remove_descriptor(&rfc2374_unit_directory);
1705 }
1706 module_exit(fwnet_cleanup);
1707 
1708 MODULE_AUTHOR("Jay Fenlason <fenlason@redhat.com>");
1709 MODULE_DESCRIPTION("IP over IEEE1394 as per RFC 2734/3146");
1710 MODULE_LICENSE("GPL");
1711 MODULE_DEVICE_TABLE(ieee1394, fwnet_id_table);
1712 

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