1 // SPDX-License-Identifier: GPL-2.0-only
3 * IPv4 over IEEE 1394, per RFC 2734
4 * IPv6 over IEEE 1394, per RFC 3146
6 * Copyright (C) 2009 Jay Fenlason <fenlason@redhat.com>
8 * based on eth1394 by Ben Collins et al
11 #include <linux/bug.h>
12 #include <linux/compiler.h>
13 #include <linux/delay.h>
14 #include <linux/device.h>
15 #include <linux/ethtool.h>
16 #include <linux/firewire.h>
17 #include <linux/firewire-constants.h>
18 #include <linux/highmem.h>
21 #include <linux/jiffies.h>
22 #include <linux/mod_devicetable.h>
23 #include <linux/module.h>
24 #include <linux/moduleparam.h>
25 #include <linux/mutex.h>
26 #include <linux/netdevice.h>
27 #include <linux/skbuff.h>
28 #include <linux/slab.h>
29 #include <linux/spinlock.h>
31 #include <asm/unaligned.h>
33 #include <net/firewire.h>
36 #define FWNET_MAX_FRAGMENTS 30 /* arbitrary, > TX queue depth */
37 #define FWNET_ISO_PAGE_COUNT (PAGE_SIZE < 16*1024 ? 4 : 2)
40 #define FWNET_MAX_QUEUED_DATAGRAMS 20 /* < 64 = number of tlabels */
41 #define FWNET_MIN_QUEUED_DATAGRAMS 10 /* should keep AT DMA busy enough */
42 #define FWNET_TX_QUEUE_LEN FWNET_MAX_QUEUED_DATAGRAMS /* ? */
44 #define IEEE1394_BROADCAST_CHANNEL 31
45 #define IEEE1394_ALL_NODES (0xffc0 | 0x003f)
46 #define IEEE1394_MAX_PAYLOAD_S100 512
47 #define FWNET_NO_FIFO_ADDR (~0ULL)
49 #define IANA_SPECIFIER_ID 0x00005eU
50 #define RFC2734_SW_VERSION 0x000001U
51 #define RFC3146_SW_VERSION 0x000002U
53 #define IEEE1394_GASP_HDR_SIZE 8
55 #define RFC2374_UNFRAG_HDR_SIZE 4
56 #define RFC2374_FRAG_HDR_SIZE 8
57 #define RFC2374_FRAG_OVERHEAD 4
59 #define RFC2374_HDR_UNFRAG 0 /* unfragmented */
60 #define RFC2374_HDR_FIRSTFRAG 1 /* first fragment */
61 #define RFC2374_HDR_LASTFRAG 2 /* last fragment */
62 #define RFC2374_HDR_INTFRAG 3 /* interior fragment */
64 static bool fwnet_hwaddr_is_multicast(u8 *ha)
69 /* IPv4 and IPv6 encapsulation header */
70 struct rfc2734_header {
75 #define fwnet_get_hdr_lf(h) (((h)->w0 & 0xc0000000) >> 30)
76 #define fwnet_get_hdr_ether_type(h) (((h)->w0 & 0x0000ffff))
77 #define fwnet_get_hdr_dg_size(h) ((((h)->w0 & 0x0fff0000) >> 16) + 1)
78 #define fwnet_get_hdr_fg_off(h) (((h)->w0 & 0x00000fff))
79 #define fwnet_get_hdr_dgl(h) (((h)->w1 & 0xffff0000) >> 16)
81 #define fwnet_set_hdr_lf(lf) ((lf) << 30)
82 #define fwnet_set_hdr_ether_type(et) (et)
83 #define fwnet_set_hdr_dg_size(dgs) (((dgs) - 1) << 16)
84 #define fwnet_set_hdr_fg_off(fgo) (fgo)
86 #define fwnet_set_hdr_dgl(dgl) ((dgl) << 16)
88 static inline void fwnet_make_uf_hdr(struct rfc2734_header *hdr,
91 hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_UNFRAG)
92 | fwnet_set_hdr_ether_type(ether_type);
95 static inline void fwnet_make_ff_hdr(struct rfc2734_header *hdr,
96 unsigned ether_type, unsigned dg_size, unsigned dgl)
98 hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_FIRSTFRAG)
99 | fwnet_set_hdr_dg_size(dg_size)
100 | fwnet_set_hdr_ether_type(ether_type);
101 hdr->w1 = fwnet_set_hdr_dgl(dgl);
104 static inline void fwnet_make_sf_hdr(struct rfc2734_header *hdr,
105 unsigned lf, unsigned dg_size, unsigned fg_off, unsigned dgl)
107 hdr->w0 = fwnet_set_hdr_lf(lf)
108 | fwnet_set_hdr_dg_size(dg_size)
109 | fwnet_set_hdr_fg_off(fg_off);
110 hdr->w1 = fwnet_set_hdr_dgl(dgl);
113 /* This list keeps track of what parts of the datagram have been filled in */
114 struct fwnet_fragment_info {
115 struct list_head fi_link;
120 struct fwnet_partial_datagram {
121 struct list_head pd_link;
122 struct list_head fi_list;
124 /* FIXME Why not use skb->data? */
131 static DEFINE_MUTEX(fwnet_device_mutex);
132 static LIST_HEAD(fwnet_device_list);
134 struct fwnet_device {
135 struct list_head dev_link;
138 FWNET_BROADCAST_ERROR,
139 FWNET_BROADCAST_RUNNING,
140 FWNET_BROADCAST_STOPPED,
142 struct fw_iso_context *broadcast_rcv_context;
143 struct fw_iso_buffer broadcast_rcv_buffer;
144 void **broadcast_rcv_buffer_ptrs;
145 unsigned broadcast_rcv_next_ptr;
146 unsigned num_broadcast_rcv_ptrs;
147 unsigned rcv_buffer_size;
149 * This value is the maximum unfragmented datagram size that can be
150 * sent by the hardware. It already has the GASP overhead and the
151 * unfragmented datagram header overhead calculated into it.
153 unsigned broadcast_xmt_max_payload;
154 u16 broadcast_xmt_datagramlabel;
157 * The CSR address that remote nodes must send datagrams to for us to
160 struct fw_address_handler handler;
163 /* Number of tx datagrams that have been queued but not yet acked */
164 int queued_datagrams;
167 struct list_head peer_list;
168 struct fw_card *card;
169 struct net_device *netdev;
173 struct list_head peer_link;
174 struct fwnet_device *dev;
177 /* guarded by dev->lock */
178 struct list_head pd_list; /* received partial datagrams */
179 unsigned pdg_size; /* pd_list size */
181 u16 datagram_label; /* outgoing datagram label */
182 u16 max_payload; /* includes RFC2374_FRAG_HDR_SIZE overhead */
188 /* This is our task struct. It's used for the packet complete callback. */
189 struct fwnet_packet_task {
190 struct fw_transaction transaction;
191 struct rfc2734_header hdr;
193 struct fwnet_device *dev;
195 int outstanding_pkts;
205 * saddr == NULL means use device source address.
206 * daddr == NULL means leave destination address (eg unresolved arp).
208 static int fwnet_header_create(struct sk_buff *skb, struct net_device *net,
209 unsigned short type, const void *daddr,
210 const void *saddr, unsigned len)
212 struct fwnet_header *h;
214 h = skb_push(skb, sizeof(*h));
215 put_unaligned_be16(type, &h->h_proto);
217 if (net->flags & (IFF_LOOPBACK | IFF_NOARP)) {
218 memset(h->h_dest, 0, net->addr_len);
220 return net->hard_header_len;
224 memcpy(h->h_dest, daddr, net->addr_len);
226 return net->hard_header_len;
229 return -net->hard_header_len;
232 static int fwnet_header_cache(const struct neighbour *neigh,
233 struct hh_cache *hh, __be16 type)
235 struct net_device *net;
236 struct fwnet_header *h;
238 if (type == cpu_to_be16(ETH_P_802_3))
241 h = (struct fwnet_header *)((u8 *)hh->hh_data + HH_DATA_OFF(sizeof(*h)));
243 memcpy(h->h_dest, neigh->ha, net->addr_len);
245 /* Pairs with the READ_ONCE() in neigh_resolve_output(),
246 * neigh_hh_output() and neigh_update_hhs().
248 smp_store_release(&hh->hh_len, FWNET_HLEN);
253 /* Called by Address Resolution module to notify changes in address. */
254 static void fwnet_header_cache_update(struct hh_cache *hh,
255 const struct net_device *net, const unsigned char *haddr)
257 memcpy((u8 *)hh->hh_data + HH_DATA_OFF(FWNET_HLEN), haddr, net->addr_len);
260 static int fwnet_header_parse(const struct sk_buff *skb, unsigned char *haddr)
262 memcpy(haddr, skb->dev->dev_addr, FWNET_ALEN);
267 static const struct header_ops fwnet_header_ops = {
268 .create = fwnet_header_create,
269 .cache = fwnet_header_cache,
270 .cache_update = fwnet_header_cache_update,
271 .parse = fwnet_header_parse,
274 /* FIXME: is this correct for all cases? */
275 static bool fwnet_frag_overlap(struct fwnet_partial_datagram *pd,
276 unsigned offset, unsigned len)
278 struct fwnet_fragment_info *fi;
279 unsigned end = offset + len;
281 list_for_each_entry(fi, &pd->fi_list, fi_link)
282 if (offset < fi->offset + fi->len && end > fi->offset)
288 /* Assumes that new fragment does not overlap any existing fragments */
289 static struct fwnet_fragment_info *fwnet_frag_new(
290 struct fwnet_partial_datagram *pd, unsigned offset, unsigned len)
292 struct fwnet_fragment_info *fi, *fi2, *new;
293 struct list_head *list;
296 list_for_each_entry(fi, &pd->fi_list, fi_link) {
297 if (fi->offset + fi->len == offset) {
298 /* The new fragment can be tacked on to the end */
299 /* Did the new fragment plug a hole? */
300 fi2 = list_entry(fi->fi_link.next,
301 struct fwnet_fragment_info, fi_link);
302 if (fi->offset + fi->len == fi2->offset) {
303 /* glue fragments together */
304 fi->len += len + fi2->len;
305 list_del(&fi2->fi_link);
313 if (offset + len == fi->offset) {
314 /* The new fragment can be tacked on to the beginning */
315 /* Did the new fragment plug a hole? */
316 fi2 = list_entry(fi->fi_link.prev,
317 struct fwnet_fragment_info, fi_link);
318 if (fi2->offset + fi2->len == fi->offset) {
319 /* glue fragments together */
320 fi2->len += fi->len + len;
321 list_del(&fi->fi_link);
331 if (offset > fi->offset + fi->len) {
335 if (offset + len < fi->offset) {
336 list = fi->fi_link.prev;
341 new = kmalloc(sizeof(*new), GFP_ATOMIC);
345 new->offset = offset;
347 list_add(&new->fi_link, list);
352 static struct fwnet_partial_datagram *fwnet_pd_new(struct net_device *net,
353 struct fwnet_peer *peer, u16 datagram_label, unsigned dg_size,
354 void *frag_buf, unsigned frag_off, unsigned frag_len)
356 struct fwnet_partial_datagram *new;
357 struct fwnet_fragment_info *fi;
359 new = kmalloc(sizeof(*new), GFP_ATOMIC);
363 INIT_LIST_HEAD(&new->fi_list);
364 fi = fwnet_frag_new(new, frag_off, frag_len);
368 new->datagram_label = datagram_label;
369 new->datagram_size = dg_size;
370 new->skb = dev_alloc_skb(dg_size + LL_RESERVED_SPACE(net));
371 if (new->skb == NULL)
374 skb_reserve(new->skb, LL_RESERVED_SPACE(net));
375 new->pbuf = skb_put(new->skb, dg_size);
376 memcpy(new->pbuf + frag_off, frag_buf, frag_len);
377 list_add_tail(&new->pd_link, &peer->pd_list);
389 static struct fwnet_partial_datagram *fwnet_pd_find(struct fwnet_peer *peer,
392 struct fwnet_partial_datagram *pd;
394 list_for_each_entry(pd, &peer->pd_list, pd_link)
395 if (pd->datagram_label == datagram_label)
402 static void fwnet_pd_delete(struct fwnet_partial_datagram *old)
404 struct fwnet_fragment_info *fi, *n;
406 list_for_each_entry_safe(fi, n, &old->fi_list, fi_link)
409 list_del(&old->pd_link);
410 dev_kfree_skb_any(old->skb);
414 static bool fwnet_pd_update(struct fwnet_peer *peer,
415 struct fwnet_partial_datagram *pd, void *frag_buf,
416 unsigned frag_off, unsigned frag_len)
418 if (fwnet_frag_new(pd, frag_off, frag_len) == NULL)
421 memcpy(pd->pbuf + frag_off, frag_buf, frag_len);
424 * Move list entry to beginning of list so that oldest partial
425 * datagrams percolate to the end of the list
427 list_move_tail(&pd->pd_link, &peer->pd_list);
432 static bool fwnet_pd_is_complete(struct fwnet_partial_datagram *pd)
434 struct fwnet_fragment_info *fi;
436 fi = list_entry(pd->fi_list.next, struct fwnet_fragment_info, fi_link);
438 return fi->len == pd->datagram_size;
441 /* caller must hold dev->lock */
442 static struct fwnet_peer *fwnet_peer_find_by_guid(struct fwnet_device *dev,
445 struct fwnet_peer *peer;
447 list_for_each_entry(peer, &dev->peer_list, peer_link)
448 if (peer->guid == guid)
454 /* caller must hold dev->lock */
455 static struct fwnet_peer *fwnet_peer_find_by_node_id(struct fwnet_device *dev,
456 int node_id, int generation)
458 struct fwnet_peer *peer;
460 list_for_each_entry(peer, &dev->peer_list, peer_link)
461 if (peer->node_id == node_id &&
462 peer->generation == generation)
468 /* See IEEE 1394-2008 table 6-4, table 8-8, table 16-18. */
469 static unsigned fwnet_max_payload(unsigned max_rec, unsigned speed)
471 max_rec = min(max_rec, speed + 8);
472 max_rec = clamp(max_rec, 8U, 11U); /* 512...4096 */
474 return (1 << (max_rec + 1)) - RFC2374_FRAG_HDR_SIZE;
478 static int fwnet_finish_incoming_packet(struct net_device *net,
479 struct sk_buff *skb, u16 source_node_id,
480 bool is_broadcast, u16 ether_type)
484 switch (ether_type) {
487 #if IS_ENABLED(CONFIG_IPV6)
495 /* Write metadata, and then pass to the receive level */
497 skb->ip_summed = CHECKSUM_NONE;
500 * Parse the encapsulation header. This actually does the job of
501 * converting to an ethernet-like pseudo frame header.
503 if (dev_hard_header(skb, net, ether_type,
504 is_broadcast ? net->broadcast : net->dev_addr,
505 NULL, skb->len) >= 0) {
506 struct fwnet_header *eth;
510 skb_reset_mac_header(skb);
511 skb_pull(skb, sizeof(*eth));
512 eth = (struct fwnet_header *)skb_mac_header(skb);
513 if (fwnet_hwaddr_is_multicast(eth->h_dest)) {
514 if (memcmp(eth->h_dest, net->broadcast,
516 skb->pkt_type = PACKET_BROADCAST;
519 skb->pkt_type = PACKET_MULTICAST;
522 if (memcmp(eth->h_dest, net->dev_addr, net->addr_len))
523 skb->pkt_type = PACKET_OTHERHOST;
525 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN) {
526 protocol = eth->h_proto;
528 rawp = (u16 *)skb->data;
530 protocol = htons(ETH_P_802_3);
532 protocol = htons(ETH_P_802_2);
534 skb->protocol = protocol;
536 status = netif_rx(skb);
537 if (status == NET_RX_DROP) {
538 net->stats.rx_errors++;
539 net->stats.rx_dropped++;
541 net->stats.rx_packets++;
542 net->stats.rx_bytes += skb->len;
548 net->stats.rx_errors++;
549 net->stats.rx_dropped++;
551 dev_kfree_skb_any(skb);
556 static int fwnet_incoming_packet(struct fwnet_device *dev, __be32 *buf, int len,
557 int source_node_id, int generation,
561 struct net_device *net = dev->netdev;
562 struct rfc2734_header hdr;
565 struct fwnet_peer *peer;
566 struct fwnet_partial_datagram *pd;
573 if (len <= RFC2374_UNFRAG_HDR_SIZE)
576 hdr.w0 = be32_to_cpu(buf[0]);
577 lf = fwnet_get_hdr_lf(&hdr);
578 if (lf == RFC2374_HDR_UNFRAG) {
580 * An unfragmented datagram has been received by the ieee1394
581 * bus. Build an skbuff around it so we can pass it to the
582 * high level network layer.
584 ether_type = fwnet_get_hdr_ether_type(&hdr);
586 len -= RFC2374_UNFRAG_HDR_SIZE;
588 skb = dev_alloc_skb(len + LL_RESERVED_SPACE(net));
589 if (unlikely(!skb)) {
590 net->stats.rx_dropped++;
594 skb_reserve(skb, LL_RESERVED_SPACE(net));
595 skb_put_data(skb, buf, len);
597 return fwnet_finish_incoming_packet(net, skb, source_node_id,
598 is_broadcast, ether_type);
601 /* A datagram fragment has been received, now the fun begins. */
603 if (len <= RFC2374_FRAG_HDR_SIZE)
606 hdr.w1 = ntohl(buf[1]);
608 len -= RFC2374_FRAG_HDR_SIZE;
609 if (lf == RFC2374_HDR_FIRSTFRAG) {
610 ether_type = fwnet_get_hdr_ether_type(&hdr);
614 fg_off = fwnet_get_hdr_fg_off(&hdr);
616 datagram_label = fwnet_get_hdr_dgl(&hdr);
617 dg_size = fwnet_get_hdr_dg_size(&hdr);
619 if (fg_off + len > dg_size)
622 spin_lock_irqsave(&dev->lock, flags);
624 peer = fwnet_peer_find_by_node_id(dev, source_node_id, generation);
630 pd = fwnet_pd_find(peer, datagram_label);
632 while (peer->pdg_size >= FWNET_MAX_FRAGMENTS) {
633 /* remove the oldest */
634 fwnet_pd_delete(list_first_entry(&peer->pd_list,
635 struct fwnet_partial_datagram, pd_link));
638 pd = fwnet_pd_new(net, peer, datagram_label,
639 dg_size, buf, fg_off, len);
646 if (fwnet_frag_overlap(pd, fg_off, len) ||
647 pd->datagram_size != dg_size) {
649 * Differing datagram sizes or overlapping fragments,
650 * discard old datagram and start a new one.
653 pd = fwnet_pd_new(net, peer, datagram_label,
654 dg_size, buf, fg_off, len);
661 if (!fwnet_pd_update(peer, pd, buf, fg_off, len)) {
663 * Couldn't save off fragment anyway
664 * so might as well obliterate the
673 } /* new datagram or add to existing one */
675 if (lf == RFC2374_HDR_FIRSTFRAG)
676 pd->ether_type = ether_type;
678 if (fwnet_pd_is_complete(pd)) {
679 ether_type = pd->ether_type;
681 skb = skb_get(pd->skb);
684 spin_unlock_irqrestore(&dev->lock, flags);
686 return fwnet_finish_incoming_packet(net, skb, source_node_id,
690 * Datagram is not complete, we're done for the
695 spin_unlock_irqrestore(&dev->lock, flags);
700 static void fwnet_receive_packet(struct fw_card *card, struct fw_request *r,
701 int tcode, int destination, int source, int generation,
702 unsigned long long offset, void *payload, size_t length,
705 struct fwnet_device *dev = callback_data;
708 if (destination == IEEE1394_ALL_NODES) {
714 if (offset != dev->handler.offset)
715 rcode = RCODE_ADDRESS_ERROR;
716 else if (tcode != TCODE_WRITE_BLOCK_REQUEST)
717 rcode = RCODE_TYPE_ERROR;
718 else if (fwnet_incoming_packet(dev, payload, length,
719 source, generation, false) != 0) {
720 dev_err(&dev->netdev->dev, "incoming packet failure\n");
721 rcode = RCODE_CONFLICT_ERROR;
723 rcode = RCODE_COMPLETE;
725 fw_send_response(card, r, rcode);
728 static int gasp_source_id(__be32 *p)
730 return be32_to_cpu(p[0]) >> 16;
733 static u32 gasp_specifier_id(__be32 *p)
735 return (be32_to_cpu(p[0]) & 0xffff) << 8 |
736 (be32_to_cpu(p[1]) & 0xff000000) >> 24;
739 static u32 gasp_version(__be32 *p)
741 return be32_to_cpu(p[1]) & 0xffffff;
744 static void fwnet_receive_broadcast(struct fw_iso_context *context,
745 u32 cycle, size_t header_length, void *header, void *data)
747 struct fwnet_device *dev;
748 struct fw_iso_packet packet;
753 unsigned long offset;
758 length = be16_to_cpup(hdr_ptr);
760 spin_lock_irqsave(&dev->lock, flags);
762 offset = dev->rcv_buffer_size * dev->broadcast_rcv_next_ptr;
763 buf_ptr = dev->broadcast_rcv_buffer_ptrs[dev->broadcast_rcv_next_ptr++];
764 if (dev->broadcast_rcv_next_ptr == dev->num_broadcast_rcv_ptrs)
765 dev->broadcast_rcv_next_ptr = 0;
767 spin_unlock_irqrestore(&dev->lock, flags);
769 if (length > IEEE1394_GASP_HDR_SIZE &&
770 gasp_specifier_id(buf_ptr) == IANA_SPECIFIER_ID &&
771 (gasp_version(buf_ptr) == RFC2734_SW_VERSION
772 #if IS_ENABLED(CONFIG_IPV6)
773 || gasp_version(buf_ptr) == RFC3146_SW_VERSION
776 fwnet_incoming_packet(dev, buf_ptr + 2,
777 length - IEEE1394_GASP_HDR_SIZE,
778 gasp_source_id(buf_ptr),
779 context->card->generation, true);
781 packet.payload_length = dev->rcv_buffer_size;
782 packet.interrupt = 1;
786 packet.header_length = IEEE1394_GASP_HDR_SIZE;
788 spin_lock_irqsave(&dev->lock, flags);
790 retval = fw_iso_context_queue(dev->broadcast_rcv_context, &packet,
791 &dev->broadcast_rcv_buffer, offset);
793 spin_unlock_irqrestore(&dev->lock, flags);
796 fw_iso_context_queue_flush(dev->broadcast_rcv_context);
798 dev_err(&dev->netdev->dev, "requeue failed\n");
801 static struct kmem_cache *fwnet_packet_task_cache;
803 static void fwnet_free_ptask(struct fwnet_packet_task *ptask)
805 dev_kfree_skb_any(ptask->skb);
806 kmem_cache_free(fwnet_packet_task_cache, ptask);
809 /* Caller must hold dev->lock. */
810 static void dec_queued_datagrams(struct fwnet_device *dev)
812 if (--dev->queued_datagrams == FWNET_MIN_QUEUED_DATAGRAMS)
813 netif_wake_queue(dev->netdev);
816 static int fwnet_send_packet(struct fwnet_packet_task *ptask);
818 static void fwnet_transmit_packet_done(struct fwnet_packet_task *ptask)
820 struct fwnet_device *dev = ptask->dev;
821 struct sk_buff *skb = ptask->skb;
825 spin_lock_irqsave(&dev->lock, flags);
827 ptask->outstanding_pkts--;
829 /* Check whether we or the networking TX soft-IRQ is last user. */
830 free = (ptask->outstanding_pkts == 0 && ptask->enqueued);
832 dec_queued_datagrams(dev);
834 if (ptask->outstanding_pkts == 0) {
835 dev->netdev->stats.tx_packets++;
836 dev->netdev->stats.tx_bytes += skb->len;
839 spin_unlock_irqrestore(&dev->lock, flags);
841 if (ptask->outstanding_pkts > 0) {
847 /* Update the ptask to point to the next fragment and send it */
848 lf = fwnet_get_hdr_lf(&ptask->hdr);
850 case RFC2374_HDR_LASTFRAG:
851 case RFC2374_HDR_UNFRAG:
853 dev_err(&dev->netdev->dev,
854 "outstanding packet %x lf %x, header %x,%x\n",
855 ptask->outstanding_pkts, lf, ptask->hdr.w0,
859 case RFC2374_HDR_FIRSTFRAG:
860 /* Set frag type here for future interior fragments */
861 dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
862 fg_off = ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
863 datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
866 case RFC2374_HDR_INTFRAG:
867 dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
868 fg_off = fwnet_get_hdr_fg_off(&ptask->hdr)
869 + ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
870 datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
874 if (ptask->dest_node == IEEE1394_ALL_NODES) {
876 ptask->max_payload + IEEE1394_GASP_HDR_SIZE);
878 skb_pull(skb, ptask->max_payload);
880 if (ptask->outstanding_pkts > 1) {
881 fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_INTFRAG,
882 dg_size, fg_off, datagram_label);
884 fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_LASTFRAG,
885 dg_size, fg_off, datagram_label);
886 ptask->max_payload = skb->len + RFC2374_FRAG_HDR_SIZE;
888 fwnet_send_packet(ptask);
892 fwnet_free_ptask(ptask);
895 static void fwnet_transmit_packet_failed(struct fwnet_packet_task *ptask)
897 struct fwnet_device *dev = ptask->dev;
901 spin_lock_irqsave(&dev->lock, flags);
903 /* One fragment failed; don't try to send remaining fragments. */
904 ptask->outstanding_pkts = 0;
906 /* Check whether we or the networking TX soft-IRQ is last user. */
907 free = ptask->enqueued;
909 dec_queued_datagrams(dev);
911 dev->netdev->stats.tx_dropped++;
912 dev->netdev->stats.tx_errors++;
914 spin_unlock_irqrestore(&dev->lock, flags);
917 fwnet_free_ptask(ptask);
920 static void fwnet_write_complete(struct fw_card *card, int rcode,
921 void *payload, size_t length, void *data)
923 struct fwnet_packet_task *ptask = data;
924 static unsigned long j;
925 static int last_rcode, errors_skipped;
927 if (rcode == RCODE_COMPLETE) {
928 fwnet_transmit_packet_done(ptask);
930 if (printk_timed_ratelimit(&j, 1000) || rcode != last_rcode) {
931 dev_err(&ptask->dev->netdev->dev,
932 "fwnet_write_complete failed: %x (skipped %d)\n",
933 rcode, errors_skipped);
940 fwnet_transmit_packet_failed(ptask);
944 static int fwnet_send_packet(struct fwnet_packet_task *ptask)
946 struct fwnet_device *dev;
948 struct rfc2734_header *bufhdr;
953 tx_len = ptask->max_payload;
954 switch (fwnet_get_hdr_lf(&ptask->hdr)) {
955 case RFC2374_HDR_UNFRAG:
956 bufhdr = skb_push(ptask->skb, RFC2374_UNFRAG_HDR_SIZE);
957 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
960 case RFC2374_HDR_FIRSTFRAG:
961 case RFC2374_HDR_INTFRAG:
962 case RFC2374_HDR_LASTFRAG:
963 bufhdr = skb_push(ptask->skb, RFC2374_FRAG_HDR_SIZE);
964 put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
965 put_unaligned_be32(ptask->hdr.w1, &bufhdr->w1);
971 if (ptask->dest_node == IEEE1394_ALL_NODES) {
975 unsigned int sw_version;
977 /* ptask->generation may not have been set yet */
978 generation = dev->card->generation;
980 node_id = dev->card->node_id;
982 switch (ptask->skb->protocol) {
984 sw_version = RFC2734_SW_VERSION;
986 #if IS_ENABLED(CONFIG_IPV6)
987 case htons(ETH_P_IPV6):
988 sw_version = RFC3146_SW_VERSION;
992 p = skb_push(ptask->skb, IEEE1394_GASP_HDR_SIZE);
993 put_unaligned_be32(node_id << 16 | IANA_SPECIFIER_ID >> 8, p);
994 put_unaligned_be32((IANA_SPECIFIER_ID & 0xff) << 24
995 | sw_version, &p[4]);
997 /* We should not transmit if broadcast_channel.valid == 0. */
998 fw_send_request(dev->card, &ptask->transaction,
1000 fw_stream_packet_destination_id(3,
1001 IEEE1394_BROADCAST_CHANNEL, 0),
1002 generation, SCODE_100, 0ULL, ptask->skb->data,
1003 tx_len + 8, fwnet_write_complete, ptask);
1005 spin_lock_irqsave(&dev->lock, flags);
1007 /* If the AT tasklet already ran, we may be last user. */
1008 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1010 ptask->enqueued = true;
1012 dec_queued_datagrams(dev);
1014 spin_unlock_irqrestore(&dev->lock, flags);
1019 fw_send_request(dev->card, &ptask->transaction,
1020 TCODE_WRITE_BLOCK_REQUEST, ptask->dest_node,
1021 ptask->generation, ptask->speed, ptask->fifo_addr,
1022 ptask->skb->data, tx_len, fwnet_write_complete, ptask);
1024 spin_lock_irqsave(&dev->lock, flags);
1026 /* If the AT tasklet already ran, we may be last user. */
1027 free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
1029 ptask->enqueued = true;
1031 dec_queued_datagrams(dev);
1033 spin_unlock_irqrestore(&dev->lock, flags);
1035 netif_trans_update(dev->netdev);
1038 fwnet_free_ptask(ptask);
1043 static void fwnet_fifo_stop(struct fwnet_device *dev)
1045 if (dev->local_fifo == FWNET_NO_FIFO_ADDR)
1048 fw_core_remove_address_handler(&dev->handler);
1049 dev->local_fifo = FWNET_NO_FIFO_ADDR;
1052 static int fwnet_fifo_start(struct fwnet_device *dev)
1056 if (dev->local_fifo != FWNET_NO_FIFO_ADDR)
1059 dev->handler.length = 4096;
1060 dev->handler.address_callback = fwnet_receive_packet;
1061 dev->handler.callback_data = dev;
1063 retval = fw_core_add_address_handler(&dev->handler,
1064 &fw_high_memory_region);
1068 dev->local_fifo = dev->handler.offset;
1073 static void __fwnet_broadcast_stop(struct fwnet_device *dev)
1077 if (dev->broadcast_state != FWNET_BROADCAST_ERROR) {
1078 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++)
1079 kunmap(dev->broadcast_rcv_buffer.pages[u]);
1080 fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer, dev->card);
1082 if (dev->broadcast_rcv_context) {
1083 fw_iso_context_destroy(dev->broadcast_rcv_context);
1084 dev->broadcast_rcv_context = NULL;
1086 kfree(dev->broadcast_rcv_buffer_ptrs);
1087 dev->broadcast_rcv_buffer_ptrs = NULL;
1088 dev->broadcast_state = FWNET_BROADCAST_ERROR;
1091 static void fwnet_broadcast_stop(struct fwnet_device *dev)
1093 if (dev->broadcast_state == FWNET_BROADCAST_ERROR)
1095 fw_iso_context_stop(dev->broadcast_rcv_context);
1096 __fwnet_broadcast_stop(dev);
1099 static int fwnet_broadcast_start(struct fwnet_device *dev)
1101 struct fw_iso_context *context;
1103 unsigned num_packets;
1104 unsigned max_receive;
1105 struct fw_iso_packet packet;
1106 unsigned long offset;
1110 if (dev->broadcast_state != FWNET_BROADCAST_ERROR)
1113 max_receive = 1U << (dev->card->max_receive + 1);
1114 num_packets = (FWNET_ISO_PAGE_COUNT * PAGE_SIZE) / max_receive;
1116 ptrptr = kmalloc_array(num_packets, sizeof(void *), GFP_KERNEL);
1121 dev->broadcast_rcv_buffer_ptrs = ptrptr;
1123 context = fw_iso_context_create(dev->card, FW_ISO_CONTEXT_RECEIVE,
1124 IEEE1394_BROADCAST_CHANNEL,
1125 dev->card->link_speed, 8,
1126 fwnet_receive_broadcast, dev);
1127 if (IS_ERR(context)) {
1128 retval = PTR_ERR(context);
1132 retval = fw_iso_buffer_init(&dev->broadcast_rcv_buffer, dev->card,
1133 FWNET_ISO_PAGE_COUNT, DMA_FROM_DEVICE);
1137 dev->broadcast_state = FWNET_BROADCAST_STOPPED;
1139 for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++) {
1143 ptr = kmap(dev->broadcast_rcv_buffer.pages[u]);
1144 for (v = 0; v < num_packets / FWNET_ISO_PAGE_COUNT; v++)
1145 *ptrptr++ = (void *) ((char *)ptr + v * max_receive);
1147 dev->broadcast_rcv_context = context;
1149 packet.payload_length = max_receive;
1150 packet.interrupt = 1;
1154 packet.header_length = IEEE1394_GASP_HDR_SIZE;
1157 for (u = 0; u < num_packets; u++) {
1158 retval = fw_iso_context_queue(context, &packet,
1159 &dev->broadcast_rcv_buffer, offset);
1163 offset += max_receive;
1165 dev->num_broadcast_rcv_ptrs = num_packets;
1166 dev->rcv_buffer_size = max_receive;
1167 dev->broadcast_rcv_next_ptr = 0U;
1168 retval = fw_iso_context_start(context, -1, 0,
1169 FW_ISO_CONTEXT_MATCH_ALL_TAGS); /* ??? sync */
1173 /* FIXME: adjust it according to the min. speed of all known peers? */
1174 dev->broadcast_xmt_max_payload = IEEE1394_MAX_PAYLOAD_S100
1175 - IEEE1394_GASP_HDR_SIZE - RFC2374_UNFRAG_HDR_SIZE;
1176 dev->broadcast_state = FWNET_BROADCAST_RUNNING;
1181 __fwnet_broadcast_stop(dev);
1185 static void set_carrier_state(struct fwnet_device *dev)
1187 if (dev->peer_count > 1)
1188 netif_carrier_on(dev->netdev);
1190 netif_carrier_off(dev->netdev);
1194 static int fwnet_open(struct net_device *net)
1196 struct fwnet_device *dev = netdev_priv(net);
1199 ret = fwnet_broadcast_start(dev);
1203 netif_start_queue(net);
1205 spin_lock_irq(&dev->lock);
1206 set_carrier_state(dev);
1207 spin_unlock_irq(&dev->lock);
1213 static int fwnet_stop(struct net_device *net)
1215 struct fwnet_device *dev = netdev_priv(net);
1217 netif_stop_queue(net);
1218 fwnet_broadcast_stop(dev);
1223 static netdev_tx_t fwnet_tx(struct sk_buff *skb, struct net_device *net)
1225 struct fwnet_header hdr_buf;
1226 struct fwnet_device *dev = netdev_priv(net);
1229 unsigned max_payload;
1231 u16 *datagram_label_ptr;
1232 struct fwnet_packet_task *ptask;
1233 struct fwnet_peer *peer;
1234 unsigned long flags;
1236 spin_lock_irqsave(&dev->lock, flags);
1238 /* Can this happen? */
1239 if (netif_queue_stopped(dev->netdev)) {
1240 spin_unlock_irqrestore(&dev->lock, flags);
1242 return NETDEV_TX_BUSY;
1245 ptask = kmem_cache_alloc(fwnet_packet_task_cache, GFP_ATOMIC);
1249 skb = skb_share_check(skb, GFP_ATOMIC);
1254 * Make a copy of the driver-specific header.
1255 * We might need to rebuild the header on tx failure.
1257 memcpy(&hdr_buf, skb->data, sizeof(hdr_buf));
1258 proto = hdr_buf.h_proto;
1261 case htons(ETH_P_ARP):
1262 case htons(ETH_P_IP):
1263 #if IS_ENABLED(CONFIG_IPV6)
1264 case htons(ETH_P_IPV6):
1271 skb_pull(skb, sizeof(hdr_buf));
1275 * Set the transmission type for the packet. ARP packets and IP
1276 * broadcast packets are sent via GASP.
1278 if (fwnet_hwaddr_is_multicast(hdr_buf.h_dest)) {
1279 max_payload = dev->broadcast_xmt_max_payload;
1280 datagram_label_ptr = &dev->broadcast_xmt_datagramlabel;
1282 ptask->fifo_addr = FWNET_NO_FIFO_ADDR;
1283 ptask->generation = 0;
1284 ptask->dest_node = IEEE1394_ALL_NODES;
1285 ptask->speed = SCODE_100;
1287 union fwnet_hwaddr *ha = (union fwnet_hwaddr *)hdr_buf.h_dest;
1288 __be64 guid = get_unaligned(&ha->uc.uniq_id);
1291 peer = fwnet_peer_find_by_guid(dev, be64_to_cpu(guid));
1295 generation = peer->generation;
1296 dest_node = peer->node_id;
1297 max_payload = peer->max_payload;
1298 datagram_label_ptr = &peer->datagram_label;
1300 ptask->fifo_addr = get_unaligned_be48(ha->uc.fifo);
1301 ptask->generation = generation;
1302 ptask->dest_node = dest_node;
1303 ptask->speed = peer->speed;
1311 /* Does it all fit in one packet? */
1312 if (dg_size <= max_payload) {
1313 fwnet_make_uf_hdr(&ptask->hdr, ntohs(proto));
1314 ptask->outstanding_pkts = 1;
1315 max_payload = dg_size + RFC2374_UNFRAG_HDR_SIZE;
1319 max_payload -= RFC2374_FRAG_OVERHEAD;
1320 datagram_label = (*datagram_label_ptr)++;
1321 fwnet_make_ff_hdr(&ptask->hdr, ntohs(proto), dg_size,
1323 ptask->outstanding_pkts = DIV_ROUND_UP(dg_size, max_payload);
1324 max_payload += RFC2374_FRAG_HDR_SIZE;
1327 if (++dev->queued_datagrams == FWNET_MAX_QUEUED_DATAGRAMS)
1328 netif_stop_queue(dev->netdev);
1330 spin_unlock_irqrestore(&dev->lock, flags);
1332 ptask->max_payload = max_payload;
1333 ptask->enqueued = 0;
1335 fwnet_send_packet(ptask);
1337 return NETDEV_TX_OK;
1340 spin_unlock_irqrestore(&dev->lock, flags);
1343 kmem_cache_free(fwnet_packet_task_cache, ptask);
1348 net->stats.tx_dropped++;
1349 net->stats.tx_errors++;
1352 * FIXME: According to a patch from 2003-02-26, "returning non-zero
1353 * causes serious problems" here, allegedly. Before that patch,
1354 * -ERRNO was returned which is not appropriate under Linux 2.6.
1355 * Perhaps more needs to be done? Stop the queue in serious
1356 * conditions and restart it elsewhere?
1358 return NETDEV_TX_OK;
1361 static const struct ethtool_ops fwnet_ethtool_ops = {
1362 .get_link = ethtool_op_get_link,
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,
1371 static void fwnet_init_dev(struct net_device *net)
1373 net->header_ops = &fwnet_header_ops;
1374 net->netdev_ops = &fwnet_netdev_ops;
1375 net->watchdog_timeo = 2 * HZ;
1376 net->flags = IFF_BROADCAST | IFF_MULTICAST;
1377 net->features = NETIF_F_HIGHDMA;
1378 net->addr_len = FWNET_ALEN;
1379 net->hard_header_len = FWNET_HLEN;
1380 net->type = ARPHRD_IEEE1394;
1381 net->tx_queue_len = FWNET_TX_QUEUE_LEN;
1382 net->ethtool_ops = &fwnet_ethtool_ops;
1385 /* caller must hold fwnet_device_mutex */
1386 static struct fwnet_device *fwnet_dev_find(struct fw_card *card)
1388 struct fwnet_device *dev;
1390 list_for_each_entry(dev, &fwnet_device_list, dev_link)
1391 if (dev->card == card)
1397 static int fwnet_add_peer(struct fwnet_device *dev,
1398 struct fw_unit *unit, struct fw_device *device)
1400 struct fwnet_peer *peer;
1402 peer = kmalloc(sizeof(*peer), GFP_KERNEL);
1406 dev_set_drvdata(&unit->device, peer);
1409 peer->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4];
1410 INIT_LIST_HEAD(&peer->pd_list);
1412 peer->datagram_label = 0;
1413 peer->speed = device->max_speed;
1414 peer->max_payload = fwnet_max_payload(device->max_rec, peer->speed);
1416 peer->generation = device->generation;
1418 peer->node_id = device->node_id;
1420 spin_lock_irq(&dev->lock);
1421 list_add_tail(&peer->peer_link, &dev->peer_list);
1423 set_carrier_state(dev);
1424 spin_unlock_irq(&dev->lock);
1429 static int fwnet_probe(struct fw_unit *unit,
1430 const struct ieee1394_device_id *id)
1432 struct fw_device *device = fw_parent_device(unit);
1433 struct fw_card *card = device->card;
1434 struct net_device *net;
1435 bool allocated_netdev = false;
1436 struct fwnet_device *dev;
1437 union fwnet_hwaddr ha;
1440 mutex_lock(&fwnet_device_mutex);
1442 dev = fwnet_dev_find(card);
1448 net = alloc_netdev(sizeof(*dev), "firewire%d", NET_NAME_UNKNOWN,
1451 mutex_unlock(&fwnet_device_mutex);
1455 allocated_netdev = true;
1456 SET_NETDEV_DEV(net, card->device);
1457 dev = netdev_priv(net);
1459 spin_lock_init(&dev->lock);
1460 dev->broadcast_state = FWNET_BROADCAST_ERROR;
1461 dev->broadcast_rcv_context = NULL;
1462 dev->broadcast_xmt_max_payload = 0;
1463 dev->broadcast_xmt_datagramlabel = 0;
1464 dev->local_fifo = FWNET_NO_FIFO_ADDR;
1465 dev->queued_datagrams = 0;
1466 INIT_LIST_HEAD(&dev->peer_list);
1470 ret = fwnet_fifo_start(dev);
1473 dev->local_fifo = dev->handler.offset;
1476 * default MTU: RFC 2734 cl. 4, RFC 3146 cl. 4
1477 * maximum MTU: RFC 2734 cl. 4.2, fragment encapsulation header's
1478 * maximum possible datagram_size + 1 = 0xfff + 1
1481 net->min_mtu = ETH_MIN_MTU;
1482 net->max_mtu = 4096U;
1484 /* Set our hardware address while we're at it */
1485 ha.uc.uniq_id = cpu_to_be64(card->guid);
1486 ha.uc.max_rec = dev->card->max_receive;
1487 ha.uc.sspd = dev->card->link_speed;
1488 put_unaligned_be48(dev->local_fifo, ha.uc.fifo);
1489 dev_addr_set(net, ha.u);
1491 memset(net->broadcast, -1, net->addr_len);
1493 ret = register_netdev(net);
1497 list_add_tail(&dev->dev_link, &fwnet_device_list);
1498 dev_notice(&net->dev, "IP over IEEE 1394 on card %s\n",
1499 dev_name(card->device));
1501 ret = fwnet_add_peer(dev, unit, device);
1502 if (ret && allocated_netdev) {
1503 unregister_netdev(net);
1504 list_del(&dev->dev_link);
1506 fwnet_fifo_stop(dev);
1510 mutex_unlock(&fwnet_device_mutex);
1516 * FIXME abort partially sent fragmented datagrams,
1517 * discard partially received fragmented datagrams
1519 static void fwnet_update(struct fw_unit *unit)
1521 struct fw_device *device = fw_parent_device(unit);
1522 struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1525 generation = device->generation;
1527 spin_lock_irq(&peer->dev->lock);
1528 peer->node_id = device->node_id;
1529 peer->generation = generation;
1530 spin_unlock_irq(&peer->dev->lock);
1533 static void fwnet_remove_peer(struct fwnet_peer *peer, struct fwnet_device *dev)
1535 struct fwnet_partial_datagram *pd, *pd_next;
1537 spin_lock_irq(&dev->lock);
1538 list_del(&peer->peer_link);
1540 set_carrier_state(dev);
1541 spin_unlock_irq(&dev->lock);
1543 list_for_each_entry_safe(pd, pd_next, &peer->pd_list, pd_link)
1544 fwnet_pd_delete(pd);
1549 static void fwnet_remove(struct fw_unit *unit)
1551 struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
1552 struct fwnet_device *dev = peer->dev;
1553 struct net_device *net;
1556 mutex_lock(&fwnet_device_mutex);
1560 fwnet_remove_peer(peer, dev);
1562 if (list_empty(&dev->peer_list)) {
1563 unregister_netdev(net);
1565 fwnet_fifo_stop(dev);
1567 for (i = 0; dev->queued_datagrams && i < 5; i++)
1569 WARN_ON(dev->queued_datagrams);
1570 list_del(&dev->dev_link);
1575 mutex_unlock(&fwnet_device_mutex);
1578 static const struct ieee1394_device_id fwnet_id_table[] = {
1580 .match_flags = IEEE1394_MATCH_SPECIFIER_ID |
1581 IEEE1394_MATCH_VERSION,
1582 .specifier_id = IANA_SPECIFIER_ID,
1583 .version = RFC2734_SW_VERSION,
1585 #if IS_ENABLED(CONFIG_IPV6)
1587 .match_flags = IEEE1394_MATCH_SPECIFIER_ID |
1588 IEEE1394_MATCH_VERSION,
1589 .specifier_id = IANA_SPECIFIER_ID,
1590 .version = RFC3146_SW_VERSION,
1596 static struct fw_driver fwnet_driver = {
1598 .owner = THIS_MODULE,
1599 .name = KBUILD_MODNAME,
1600 .bus = &fw_bus_type,
1602 .probe = fwnet_probe,
1603 .update = fwnet_update,
1604 .remove = fwnet_remove,
1605 .id_table = fwnet_id_table,
1608 static const u32 rfc2374_unit_directory_data[] = {
1609 0x00040000, /* directory_length */
1610 0x1200005e, /* unit_specifier_id: IANA */
1611 0x81000003, /* textual descriptor offset */
1612 0x13000001, /* unit_sw_version: RFC 2734 */
1613 0x81000005, /* textual descriptor offset */
1614 0x00030000, /* descriptor_length */
1615 0x00000000, /* text */
1616 0x00000000, /* minimal ASCII, en */
1617 0x49414e41, /* I A N A */
1618 0x00030000, /* descriptor_length */
1619 0x00000000, /* text */
1620 0x00000000, /* minimal ASCII, en */
1621 0x49507634, /* I P v 4 */
1624 static struct fw_descriptor rfc2374_unit_directory = {
1625 .length = ARRAY_SIZE(rfc2374_unit_directory_data),
1626 .key = (CSR_DIRECTORY | CSR_UNIT) << 24,
1627 .data = rfc2374_unit_directory_data
1630 #if IS_ENABLED(CONFIG_IPV6)
1631 static const u32 rfc3146_unit_directory_data[] = {
1632 0x00040000, /* directory_length */
1633 0x1200005e, /* unit_specifier_id: IANA */
1634 0x81000003, /* textual descriptor offset */
1635 0x13000002, /* unit_sw_version: RFC 3146 */
1636 0x81000005, /* textual descriptor offset */
1637 0x00030000, /* descriptor_length */
1638 0x00000000, /* text */
1639 0x00000000, /* minimal ASCII, en */
1640 0x49414e41, /* I A N A */
1641 0x00030000, /* descriptor_length */
1642 0x00000000, /* text */
1643 0x00000000, /* minimal ASCII, en */
1644 0x49507636, /* I P v 6 */
1647 static struct fw_descriptor rfc3146_unit_directory = {
1648 .length = ARRAY_SIZE(rfc3146_unit_directory_data),
1649 .key = (CSR_DIRECTORY | CSR_UNIT) << 24,
1650 .data = rfc3146_unit_directory_data
1654 static int __init fwnet_init(void)
1658 err = fw_core_add_descriptor(&rfc2374_unit_directory);
1662 #if IS_ENABLED(CONFIG_IPV6)
1663 err = fw_core_add_descriptor(&rfc3146_unit_directory);
1668 fwnet_packet_task_cache = kmem_cache_create("packet_task",
1669 sizeof(struct fwnet_packet_task), 0, 0, NULL);
1670 if (!fwnet_packet_task_cache) {
1675 err = driver_register(&fwnet_driver.driver);
1679 kmem_cache_destroy(fwnet_packet_task_cache);
1681 #if IS_ENABLED(CONFIG_IPV6)
1682 fw_core_remove_descriptor(&rfc3146_unit_directory);
1685 fw_core_remove_descriptor(&rfc2374_unit_directory);
1689 module_init(fwnet_init);
1691 static void __exit fwnet_cleanup(void)
1693 driver_unregister(&fwnet_driver.driver);
1694 kmem_cache_destroy(fwnet_packet_task_cache);
1695 #if IS_ENABLED(CONFIG_IPV6)
1696 fw_core_remove_descriptor(&rfc3146_unit_directory);
1698 fw_core_remove_descriptor(&rfc2374_unit_directory);
1700 module_exit(fwnet_cleanup);
1702 MODULE_AUTHOR("Jay Fenlason <fenlason@redhat.com>");
1703 MODULE_DESCRIPTION("IP over IEEE1394 as per RFC 2734/3146");
1704 MODULE_LICENSE("GPL");
1705 MODULE_DEVICE_TABLE(ieee1394, fwnet_id_table);