Home Home > GIT Browse
summaryrefslogtreecommitdiff
blob: 6c819513a930dd70a2cf9fd8711422c778996a65 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
/*
 * eth1394.c -- Ethernet driver for Linux IEEE-1394 Subsystem
 *
 * Copyright (C) 2001-2003 Ben Collins <bcollins@debian.org>
 *               2000 Bonin Franck <boninf@free.fr>
 *               2003 Steve Kinneberg <kinnebergsteve@acmsystems.com>
 *
 * Mainly based on work by Emanuel Pirker and Andreas E. Bombe
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

/* This driver intends to support RFC 2734, which describes a method for
 * transporting IPv4 datagrams over IEEE-1394 serial busses. This driver
 * will ultimately support that method, but currently falls short in
 * several areas.
 *
 * TODO:
 * RFC 2734 related:
 * - Add MCAP. Limited Multicast exists only to 224.0.0.1 and 224.0.0.2.
 *
 * Non-RFC 2734 related:
 * - Handle fragmented skb's coming from the networking layer.
 * - Move generic GASP reception to core 1394 code
 * - Convert kmalloc/kfree for link fragments to use kmem_cache_* instead
 * - Stability improvements
 * - Performance enhancements
 * - Consider garbage collecting old partial datagrams after X amount of time
 */


#include <linux/module.h>

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/delay.h>
#include <linux/init.h>

#include <linux/netdevice.h>
#include <linux/inetdevice.h>
#include <linux/etherdevice.h>
#include <linux/if_arp.h>
#include <linux/if_ether.h>
#include <linux/ip.h>
#include <linux/in.h>
#include <linux/tcp.h>
#include <linux/skbuff.h>
#include <linux/bitops.h>
#include <linux/ethtool.h>
#include <asm/uaccess.h>
#include <asm/delay.h>
#include <asm/unaligned.h>
#include <net/arp.h>

#include "config_roms.h"
#include "csr1212.h"
#include "eth1394.h"
#include "highlevel.h"
#include "ieee1394.h"
#include "ieee1394_core.h"
#include "ieee1394_hotplug.h"
#include "ieee1394_transactions.h"
#include "ieee1394_types.h"
#include "iso.h"
#include "nodemgr.h"

#define ETH1394_PRINT_G(level, fmt, args...) \
	printk(level "%s: " fmt, driver_name, ## args)

#define ETH1394_PRINT(level, dev_name, fmt, args...) \
	printk(level "%s: %s: " fmt, driver_name, dev_name, ## args)

#define DEBUG(fmt, args...) \
	printk(KERN_ERR "%s:%s[%d]: " fmt "\n", driver_name, __FUNCTION__, __LINE__, ## args)
#define TRACE() printk(KERN_ERR "%s:%s[%d] ---- TRACE\n", driver_name, __FUNCTION__, __LINE__)

struct fragment_info {
	struct list_head list;
	int offset;
	int len;
};

struct partial_datagram {
	struct list_head list;
	u16 dgl;
	u16 dg_size;
	u16 ether_type;
	struct sk_buff *skb;
	char *pbuf;
	struct list_head frag_info;
};

struct pdg_list {
	struct list_head list;		/* partial datagram list per node	*/
	unsigned int sz;		/* partial datagram list size per node	*/
	spinlock_t lock;		/* partial datagram lock		*/
};

struct eth1394_host_info {
	struct hpsb_host *host;
	struct net_device *dev;
};

struct eth1394_node_ref {
	struct unit_directory *ud;
	struct list_head list;
};

struct eth1394_node_info {
	u16 maxpayload;			/* Max payload			*/
	u8 sspd;			/* Max speed			*/
	u64 fifo;			/* FIFO address			*/
	struct pdg_list pdg;		/* partial RX datagram lists	*/
	int dgl;			/* Outgoing datagram label	*/
};

/* Our ieee1394 highlevel driver */
#define ETH1394_DRIVER_NAME "eth1394"
static const char driver_name[] = ETH1394_DRIVER_NAME;

static struct kmem_cache *packet_task_cache;

static struct hpsb_highlevel eth1394_highlevel;

/* Use common.lf to determine header len */
static const int hdr_type_len[] = {
	sizeof (struct eth1394_uf_hdr),
	sizeof (struct eth1394_ff_hdr),
	sizeof (struct eth1394_sf_hdr),
	sizeof (struct eth1394_sf_hdr)
};

/* Change this to IEEE1394_SPEED_S100 to make testing easier */
#define ETH1394_SPEED_DEF	IEEE1394_SPEED_MAX

/* For now, this needs to be 1500, so that XP works with us */
#define ETH1394_DATA_LEN	ETH_DATA_LEN

static const u16 eth1394_speedto_maxpayload[] = {
/*     S100, S200, S400, S800, S1600, S3200 */
	512, 1024, 2048, 4096,  4096,  4096
};

MODULE_AUTHOR("Ben Collins (bcollins@debian.org)");
MODULE_DESCRIPTION("IEEE 1394 IPv4 Driver (IPv4-over-1394 as per RFC 2734)");
MODULE_LICENSE("GPL");

/* The max_partial_datagrams parameter is the maximum number of fragmented
 * datagrams per node that eth1394 will keep in memory.  Providing an upper
 * bound allows us to limit the amount of memory that partial datagrams
 * consume in the event that some partial datagrams are never completed.
 */
static int max_partial_datagrams = 25;
module_param(max_partial_datagrams, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(max_partial_datagrams,
		 "Maximum number of partially received fragmented datagrams "
		 "(default = 25).");


static int ether1394_header(struct sk_buff *skb, struct net_device *dev,
			    unsigned short type, void *daddr, void *saddr,
			    unsigned len);
static int ether1394_rebuild_header(struct sk_buff *skb);
static int ether1394_header_parse(struct sk_buff *skb, unsigned char *haddr);
static int ether1394_header_cache(struct neighbour *neigh, struct hh_cache *hh);
static void ether1394_header_cache_update(struct hh_cache *hh,
					  struct net_device *dev,
					  unsigned char * haddr);
static int ether1394_mac_addr(struct net_device *dev, void *p);

static void purge_partial_datagram(struct list_head *old);
static int ether1394_tx(struct sk_buff *skb, struct net_device *dev);
static void ether1394_iso(struct hpsb_iso *iso);

static struct ethtool_ops ethtool_ops;

static int ether1394_write(struct hpsb_host *host, int srcid, int destid,
			   quadlet_t *data, u64 addr, size_t len, u16 flags);
static void ether1394_add_host (struct hpsb_host *host);
static void ether1394_remove_host (struct hpsb_host *host);
static void ether1394_host_reset (struct hpsb_host *host);

/* Function for incoming 1394 packets */
static struct hpsb_address_ops addr_ops = {
	.write =	ether1394_write,
};

/* Ieee1394 highlevel driver functions */
static struct hpsb_highlevel eth1394_highlevel = {
	.name =		driver_name,
	.add_host =	ether1394_add_host,
	.remove_host =	ether1394_remove_host,
	.host_reset =	ether1394_host_reset,
};


/* This is called after an "ifup" */
static int ether1394_open (struct net_device *dev)
{
	struct eth1394_priv *priv = netdev_priv(dev);
	int ret = 0;

	/* Something bad happened, don't even try */
	if (priv->bc_state == ETHER1394_BC_ERROR) {
		/* we'll try again */
		priv->iso = hpsb_iso_recv_init(priv->host,
					       ETHER1394_ISO_BUF_SIZE,
					       ETHER1394_GASP_BUFFERS,
					       priv->broadcast_channel,
					       HPSB_ISO_DMA_PACKET_PER_BUFFER,
					       1, ether1394_iso);
		if (priv->iso == NULL) {
			ETH1394_PRINT(KERN_ERR, dev->name,
				      "Could not allocate isochronous receive "
				      "context for the broadcast channel\n");
			priv->bc_state = ETHER1394_BC_ERROR;
			ret = -EAGAIN;
		} else {
			if (hpsb_iso_recv_start(priv->iso, -1, (1 << 3), -1) < 0)
				priv->bc_state = ETHER1394_BC_STOPPED;
			else
				priv->bc_state = ETHER1394_BC_RUNNING;
		}
	}

	if (ret)
		return ret;

	netif_start_queue (dev);
	return 0;
}

/* This is called after an "ifdown" */
static int ether1394_stop (struct net_device *dev)
{
	netif_stop_queue (dev);
	return 0;
}

/* Return statistics to the caller */
static struct net_device_stats *ether1394_stats (struct net_device *dev)
{
	return &(((struct eth1394_priv *)netdev_priv(dev))->stats);
}

/* What to do if we timeout. I think a host reset is probably in order, so
 * that's what we do. Should we increment the stat counters too?  */
static void ether1394_tx_timeout (struct net_device *dev)
{
	ETH1394_PRINT (KERN_ERR, dev->name, "Timeout, resetting host %s\n",
		       ((struct eth1394_priv *)netdev_priv(dev))->host->driver->name);

	highlevel_host_reset (((struct eth1394_priv *)netdev_priv(dev))->host);

	netif_wake_queue (dev);
}

static int ether1394_change_mtu(struct net_device *dev, int new_mtu)
{
	struct eth1394_priv *priv = netdev_priv(dev);

	if ((new_mtu < 68) ||
	    (new_mtu > min(ETH1394_DATA_LEN,
			   (int)((1 << (priv->host->csr.max_rec + 1)) -
				 (sizeof(union eth1394_hdr) +
				  ETHER1394_GASP_OVERHEAD)))))
		return -EINVAL;
	dev->mtu = new_mtu;
	return 0;
}

static void purge_partial_datagram(struct list_head *old)
{
	struct partial_datagram *pd = list_entry(old, struct partial_datagram, list);
	struct list_head *lh, *n;

	list_for_each_safe(lh, n, &pd->frag_info) {
		struct fragment_info *fi = list_entry(lh, struct fragment_info, list);
		list_del(lh);
		kfree(fi);
	}
	list_del(old);
	kfree_skb(pd->skb);
	kfree(pd);
}

/******************************************
 * 1394 bus activity functions
 ******************************************/

static struct eth1394_node_ref *eth1394_find_node(struct list_head *inl,
						  struct unit_directory *ud)
{
	struct eth1394_node_ref *node;

	list_for_each_entry(node, inl, list)
		if (node->ud == ud)
			return node;

	return NULL;
}

static struct eth1394_node_ref *eth1394_find_node_guid(struct list_head *inl,
						       u64 guid)
{
	struct eth1394_node_ref *node;

	list_for_each_entry(node, inl, list)
		if (node->ud->ne->guid == guid)
			return node;

	return NULL;
}

static struct eth1394_node_ref *eth1394_find_node_nodeid(struct list_head *inl,
							 nodeid_t nodeid)
{
	struct eth1394_node_ref *node;
	list_for_each_entry(node, inl, list) {
		if (node->ud->ne->nodeid == nodeid)
			return node;
	}

	return NULL;
}

static int eth1394_probe(struct device *dev)
{
	struct unit_directory *ud;
	struct eth1394_host_info *hi;
	struct eth1394_priv *priv;
	struct eth1394_node_ref *new_node;
	struct eth1394_node_info *node_info;

	ud = container_of(dev, struct unit_directory, device);

	hi = hpsb_get_hostinfo(&eth1394_highlevel, ud->ne->host);
	if (!hi)
		return -ENOENT;

	new_node = kmalloc(sizeof(*new_node),
			   in_interrupt() ? GFP_ATOMIC : GFP_KERNEL);
	if (!new_node)
		return -ENOMEM;

	node_info = kmalloc(sizeof(*node_info),
			    in_interrupt() ? GFP_ATOMIC : GFP_KERNEL);
	if (!node_info) {
		kfree(new_node);
		return -ENOMEM;
	}

	spin_lock_init(&node_info->pdg.lock);
	INIT_LIST_HEAD(&node_info->pdg.list);
	node_info->pdg.sz = 0;
	node_info->fifo = CSR1212_INVALID_ADDR_SPACE;

	ud->device.driver_data = node_info;
	new_node->ud = ud;

	priv = netdev_priv(hi->dev);
	list_add_tail(&new_node->list, &priv->ip_node_list);

	return 0;
}

static int eth1394_remove(struct device *dev)
{
	struct unit_directory *ud;
	struct eth1394_host_info *hi;
	struct eth1394_priv *priv;
	struct eth1394_node_ref *old_node;
	struct eth1394_node_info *node_info;
	struct list_head *lh, *n;
	unsigned long flags;

	ud = container_of(dev, struct unit_directory, device);
	hi = hpsb_get_hostinfo(&eth1394_highlevel, ud->ne->host);
	if (!hi)
		return -ENOENT;

	priv = netdev_priv(hi->dev);

	old_node = eth1394_find_node(&priv->ip_node_list, ud);

	if (old_node) {
		list_del(&old_node->list);
		kfree(old_node);

		node_info = (struct eth1394_node_info*)ud->device.driver_data;

		spin_lock_irqsave(&node_info->pdg.lock, flags);
		/* The partial datagram list should be empty, but we'll just
		 * make sure anyway... */
		list_for_each_safe(lh, n, &node_info->pdg.list) {
			purge_partial_datagram(lh);
		}
		spin_unlock_irqrestore(&node_info->pdg.lock, flags);

		kfree(node_info);
		ud->device.driver_data = NULL;
	}
	return 0;
}

static int eth1394_update(struct unit_directory *ud)
{
	struct eth1394_host_info *hi;
	struct eth1394_priv *priv;
	struct eth1394_node_ref *node;
	struct eth1394_node_info *node_info;

	hi = hpsb_get_hostinfo(&eth1394_highlevel, ud->ne->host);
	if (!hi)
		return -ENOENT;

	priv = netdev_priv(hi->dev);

	node = eth1394_find_node(&priv->ip_node_list, ud);

	if (!node) {
		node = kmalloc(sizeof(*node),
			       in_interrupt() ? GFP_ATOMIC : GFP_KERNEL);
		if (!node)
			return -ENOMEM;

		node_info = kmalloc(sizeof(*node_info),
				    in_interrupt() ? GFP_ATOMIC : GFP_KERNEL);
		if (!node_info) {
			kfree(node);
			return -ENOMEM;
		}

		spin_lock_init(&node_info->pdg.lock);
		INIT_LIST_HEAD(&node_info->pdg.list);
		node_info->pdg.sz = 0;

		ud->device.driver_data = node_info;
		node->ud = ud;

		priv = netdev_priv(hi->dev);
		list_add_tail(&node->list, &priv->ip_node_list);
	}

	return 0;
}


static struct ieee1394_device_id eth1394_id_table[] = {
	{
		.match_flags = (IEEE1394_MATCH_SPECIFIER_ID |
				IEEE1394_MATCH_VERSION),
		.specifier_id =	ETHER1394_GASP_SPECIFIER_ID,
		.version = ETHER1394_GASP_VERSION,
	},
	{}
};

MODULE_DEVICE_TABLE(ieee1394, eth1394_id_table);

static struct hpsb_protocol_driver eth1394_proto_driver = {
	.name		= ETH1394_DRIVER_NAME,
	.id_table	= eth1394_id_table,
	.update		= eth1394_update,
	.driver		= {
		.probe		= eth1394_probe,
		.remove		= eth1394_remove,
	},
};


static void ether1394_reset_priv (struct net_device *dev, int set_mtu)
{
	unsigned long flags;
	int i;
	struct eth1394_priv *priv = netdev_priv(dev);
	struct hpsb_host *host = priv->host;
	u64 guid = get_unaligned((u64*)&(host->csr.rom->bus_info_data[3]));
	u16 maxpayload = 1 << (host->csr.max_rec + 1);
	int max_speed = IEEE1394_SPEED_MAX;

	spin_lock_irqsave (&priv->lock, flags);

	memset(priv->ud_list, 0, sizeof(struct node_entry*) * ALL_NODES);
	priv->bc_maxpayload = 512;

	/* Determine speed limit */
	for (i = 0; i < host->node_count; i++)
		if (max_speed > host->speed[i])
			max_speed = host->speed[i];
	priv->bc_sspd = max_speed;

	/* We'll use our maxpayload as the default mtu */
	if (set_mtu) {
		dev->mtu = min(ETH1394_DATA_LEN,
			       (int)(maxpayload -
				     (sizeof(union eth1394_hdr) +
				      ETHER1394_GASP_OVERHEAD)));

		/* Set our hardware address while we're at it */
		memcpy(dev->dev_addr, &guid, sizeof(u64));
		memset(dev->broadcast, 0xff, sizeof(u64));
	}

	spin_unlock_irqrestore (&priv->lock, flags);
}

/* This function is called right before register_netdev */
static void ether1394_init_dev (struct net_device *dev)
{
	/* Our functions */
	dev->open		= ether1394_open;
	dev->stop		= ether1394_stop;
	dev->hard_start_xmit	= ether1394_tx;
	dev->get_stats		= ether1394_stats;
	dev->tx_timeout		= ether1394_tx_timeout;
	dev->change_mtu		= ether1394_change_mtu;

	dev->hard_header	= ether1394_header;
	dev->rebuild_header	= ether1394_rebuild_header;
	dev->hard_header_cache	= ether1394_header_cache;
	dev->header_cache_update= ether1394_header_cache_update;
	dev->hard_header_parse	= ether1394_header_parse;
	dev->set_mac_address	= ether1394_mac_addr;
	SET_ETHTOOL_OPS(dev, &ethtool_ops);

	/* Some constants */
	dev->watchdog_timeo	= ETHER1394_TIMEOUT;
	dev->flags		= IFF_BROADCAST | IFF_MULTICAST;
	dev->features		= NETIF_F_HIGHDMA;
	dev->addr_len		= ETH1394_ALEN;
	dev->hard_header_len 	= ETH1394_HLEN;
	dev->type		= ARPHRD_IEEE1394;

	ether1394_reset_priv (dev, 1);
}

/*
 * This function is called every time a card is found. It is generally called
 * when the module is installed. This is where we add all of our ethernet
 * devices. One for each host.
 */
static void ether1394_add_host (struct hpsb_host *host)
{
	struct eth1394_host_info *hi = NULL;
	struct net_device *dev = NULL;
	struct eth1394_priv *priv;
	u64 fifo_addr;

	if (!(host->config_roms & HPSB_CONFIG_ROM_ENTRY_IP1394))
		return;

	fifo_addr = hpsb_allocate_and_register_addrspace(
			&eth1394_highlevel, host, &addr_ops,
			ETHER1394_REGION_ADDR_LEN, ETHER1394_REGION_ADDR_LEN,
			CSR1212_INVALID_ADDR_SPACE, CSR1212_INVALID_ADDR_SPACE);
	if (fifo_addr == CSR1212_INVALID_ADDR_SPACE)
		goto out;

	/* We should really have our own alloc_hpsbdev() function in
	 * net_init.c instead of calling the one for ethernet then hijacking
	 * it for ourselves.  That way we'd be a real networking device. */
	dev = alloc_etherdev(sizeof (struct eth1394_priv));

	if (dev == NULL) {
		ETH1394_PRINT_G (KERN_ERR, "Out of memory trying to allocate "
				 "etherdevice for IEEE 1394 device %s-%d\n",
				 host->driver->name, host->id);
		goto out;
        }

	SET_MODULE_OWNER(dev);

	/* This used to be &host->device in Linux 2.6.20 and before. */
	SET_NETDEV_DEV(dev, host->device.parent);

	priv = netdev_priv(dev);

	INIT_LIST_HEAD(&priv->ip_node_list);

	spin_lock_init(&priv->lock);
	priv->host = host;
	priv->local_fifo = fifo_addr;

	hi = hpsb_create_hostinfo(&eth1394_highlevel, host, sizeof(*hi));

	if (hi == NULL) {
		ETH1394_PRINT_G (KERN_ERR, "Out of memory trying to create "
				 "hostinfo for IEEE 1394 device %s-%d\n",
				 host->driver->name, host->id);
		goto out;
        }

	ether1394_init_dev(dev);

	if (register_netdev (dev)) {
		ETH1394_PRINT (KERN_ERR, dev->name, "Error registering network driver\n");
		goto out;
	}

	ETH1394_PRINT (KERN_INFO, dev->name, "IEEE-1394 IPv4 over 1394 Ethernet (fw-host%d)\n",
		       host->id);

	hi->host = host;
	hi->dev = dev;

	/* Ignore validity in hopes that it will be set in the future.  It'll
	 * be checked when the eth device is opened. */
	priv->broadcast_channel = host->csr.broadcast_channel & 0x3f;

	priv->iso = hpsb_iso_recv_init(host,
				       ETHER1394_ISO_BUF_SIZE,
				       ETHER1394_GASP_BUFFERS,
				       priv->broadcast_channel,
				       HPSB_ISO_DMA_PACKET_PER_BUFFER,
				       1, ether1394_iso);
	if (priv->iso == NULL) {
		ETH1394_PRINT(KERN_ERR, dev->name,
			      "Could not allocate isochronous receive context "
			      "for the broadcast channel\n");
		priv->bc_state = ETHER1394_BC_ERROR;
	} else {
		if (hpsb_iso_recv_start(priv->iso, -1, (1 << 3), -1) < 0)
			priv->bc_state = ETHER1394_BC_STOPPED;
		else
			priv->bc_state = ETHER1394_BC_RUNNING;
	}

	return;

out:
	if (dev != NULL)
		free_netdev(dev);
	if (hi)
		hpsb_destroy_hostinfo(&eth1394_highlevel, host);

	return;
}

/* Remove a card from our list */
static void ether1394_remove_host (struct hpsb_host *host)
{
	struct eth1394_host_info *hi;

	hi = hpsb_get_hostinfo(&eth1394_highlevel, host);
	if (hi != NULL) {
		struct eth1394_priv *priv = netdev_priv(hi->dev);

		hpsb_unregister_addrspace(&eth1394_highlevel, host,
					  priv->local_fifo);

		if (priv->iso != NULL)
			hpsb_iso_shutdown(priv->iso);

		if (hi->dev) {
			unregister_netdev (hi->dev);
			free_netdev(hi->dev);
		}
	}

	return;
}

/* A reset has just arisen */
static void ether1394_host_reset (struct hpsb_host *host)
{
	struct eth1394_host_info *hi;
	struct eth1394_priv *priv;
	struct net_device *dev;
	struct list_head *lh, *n;
	struct eth1394_node_ref *node;
	struct eth1394_node_info *node_info;
	unsigned long flags;

	hi = hpsb_get_hostinfo(&eth1394_highlevel, host);

	/* This can happen for hosts that we don't use */
	if (hi == NULL)
		return;

	dev = hi->dev;
	priv = (struct eth1394_priv *)netdev_priv(dev);

	/* Reset our private host data, but not our mtu */
	netif_stop_queue (dev);
	ether1394_reset_priv (dev, 0);

	list_for_each_entry(node, &priv->ip_node_list, list) {
		node_info = (struct eth1394_node_info*)node->ud->device.driver_data;

		spin_lock_irqsave(&node_info->pdg.lock, flags);

		list_for_each_safe(lh, n, &node_info->pdg.list) {
			purge_partial_datagram(lh);
		}

		INIT_LIST_HEAD(&(node_info->pdg.list));
		node_info->pdg.sz = 0;

		spin_unlock_irqrestore(&node_info->pdg.lock, flags);
	}

	netif_wake_queue (dev);
}

/******************************************
 * HW Header net device functions
 ******************************************/
/* These functions have been adapted from net/ethernet/eth.c */


/* Create a fake MAC header for an arbitrary protocol layer.
 * saddr=NULL means use device source address
 * daddr=NULL means leave destination address (eg unresolved arp). */
static int ether1394_header(struct sk_buff *skb, struct net_device *dev,
			    unsigned short type, void *daddr, void *saddr,
			    unsigned len)
{
	struct eth1394hdr *eth = (struct eth1394hdr *)skb_push(skb, ETH1394_HLEN);

	eth->h_proto = htons(type);

	if (dev->flags & (IFF_LOOPBACK|IFF_NOARP)) {
		memset(eth->h_dest, 0, dev->addr_len);
		return(dev->hard_header_len);
	}

	if (daddr) {
		memcpy(eth->h_dest,daddr,dev->addr_len);
		return dev->hard_header_len;
	}

	return -dev->hard_header_len;

}


/* Rebuild the faked MAC header. This is called after an ARP
 * (or in future other address resolution) has completed on this
 * sk_buff. We now let ARP fill in the other fields.
 *
 * This routine CANNOT use cached dst->neigh!
 * Really, it is used only when dst->neigh is wrong.
 */
static int ether1394_rebuild_header(struct sk_buff *skb)
{
	struct eth1394hdr *eth = (struct eth1394hdr *)skb->data;
	struct net_device *dev = skb->dev;

	switch (eth->h_proto) {

#ifdef CONFIG_INET
	case __constant_htons(ETH_P_IP):
 		return arp_find((unsigned char*)&eth->h_dest, skb);
#endif
	default:
		ETH1394_PRINT(KERN_DEBUG, dev->name,
			      "unable to resolve type %04x addresses.\n",
			      ntohs(eth->h_proto));
		break;
	}

	return 0;
}

static int ether1394_header_parse(struct sk_buff *skb, unsigned char *haddr)
{
	struct net_device *dev = skb->dev;
	memcpy(haddr, dev->dev_addr, ETH1394_ALEN);
	return ETH1394_ALEN;
}


static int ether1394_header_cache(struct neighbour *neigh, struct hh_cache *hh)
{
	unsigned short type = hh->hh_type;
	struct eth1394hdr *eth = (struct eth1394hdr*)(((u8*)hh->hh_data) +
						      (16 - ETH1394_HLEN));
	struct net_device *dev = neigh->dev;

	if (type == htons(ETH_P_802_3))
		return -1;

	eth->h_proto = type;
	memcpy(eth->h_dest, neigh->ha, dev->addr_len);

	hh->hh_len = ETH1394_HLEN;
	return 0;
}

/* Called by Address Resolution module to notify changes in address. */
static void ether1394_header_cache_update(struct hh_cache *hh,
					  struct net_device *dev,
					  unsigned char * haddr)
{
	memcpy(((u8*)hh->hh_data) + (16 - ETH1394_HLEN), haddr, dev->addr_len);
}

static int ether1394_mac_addr(struct net_device *dev, void *p)
{
	if (netif_running(dev))
		return -EBUSY;

	/* Not going to allow setting the MAC address, we really need to use
	 * the real one supplied by the hardware */
	 return -EINVAL;
 }



/******************************************
 * Datagram reception code
 ******************************************/

/* Copied from net/ethernet/eth.c */
static inline u16 ether1394_type_trans(struct sk_buff *skb,
				       struct net_device *dev)
{
	struct eth1394hdr *eth;
	unsigned char *rawp;

	skb->mac.raw = skb->data;
	skb_pull (skb, ETH1394_HLEN);
	eth = eth1394_hdr(skb);

	if (*eth->h_dest & 1) {
		if (memcmp(eth->h_dest, dev->broadcast, dev->addr_len)==0)
			skb->pkt_type = PACKET_BROADCAST;
#if 0
		else
			skb->pkt_type = PACKET_MULTICAST;
#endif
	} else {
		if (memcmp(eth->h_dest, dev->dev_addr, dev->addr_len))
			skb->pkt_type = PACKET_OTHERHOST;
        }

	if (ntohs (eth->h_proto) >= 1536)
		return eth->h_proto;

	rawp = skb->data;

        if (*(unsigned short *)rawp == 0xFFFF)
		return htons (ETH_P_802_3);

        return htons (ETH_P_802_2);
}

/* Parse an encapsulated IP1394 header into an ethernet frame packet.
 * We also perform ARP translation here, if need be.  */
static inline u16 ether1394_parse_encap(struct sk_buff *skb,
					struct net_device *dev,
					nodeid_t srcid, nodeid_t destid,
					u16 ether_type)
{
	struct eth1394_priv *priv = netdev_priv(dev);
	u64 dest_hw;
	unsigned short ret = 0;

	/* Setup our hw addresses. We use these to build the
	 * ethernet header.  */
	if (destid == (LOCAL_BUS | ALL_NODES))
		dest_hw = ~0ULL;  /* broadcast */
	else
		dest_hw = cpu_to_be64((((u64)priv->host->csr.guid_hi) << 32) |
				      priv->host->csr.guid_lo);

	/* If this is an ARP packet, convert it. First, we want to make
	 * use of some of the fields, since they tell us a little bit
	 * about the sending machine.  */
	if (ether_type == htons(ETH_P_ARP)) {
		struct eth1394_arp *arp1394 = (struct eth1394_arp*)skb->data;
		struct arphdr *arp = (struct arphdr *)skb->data;
		unsigned char *arp_ptr = (unsigned char *)(arp + 1);
		u64 fifo_addr = (u64)ntohs(arp1394->fifo_hi) << 32 |
			ntohl(arp1394->fifo_lo);
		u8 max_rec = min(priv->host->csr.max_rec,
				 (u8)(arp1394->max_rec));
		int sspd = arp1394->sspd;
		u16 maxpayload;
		struct eth1394_node_ref *node;
		struct eth1394_node_info *node_info;
		__be64 guid;

		/* Sanity check. MacOSX seems to be sending us 131 in this
		 * field (atleast on my Panther G5). Not sure why. */
		if (sspd > 5 || sspd < 0)
			sspd = 0;

		maxpayload = min(eth1394_speedto_maxpayload[sspd], (u16)(1 << (max_rec + 1)));

		guid = get_unaligned(&arp1394->s_uniq_id);
		node = eth1394_find_node_guid(&priv->ip_node_list,
					      be64_to_cpu(guid));
		if (!node) {
			return 0;
		}

		node_info = (struct eth1394_node_info*)node->ud->device.driver_data;

		/* Update our speed/payload/fifo_offset table */
		node_info->maxpayload =	maxpayload;
		node_info->sspd =	sspd;
		node_info->fifo =	fifo_addr;

		/* Now that we're done with the 1394 specific stuff, we'll
		 * need to alter some of the data.  Believe it or not, all
		 * that needs to be done is sender_IP_address needs to be
		 * moved, the destination hardware address get stuffed
		 * in and the hardware address length set to 8.
		 *
		 * IMPORTANT: The code below overwrites 1394 specific data
		 * needed above so keep the munging of the data for the
		 * higher level IP stack last. */

		arp->ar_hln = 8;
		arp_ptr += arp->ar_hln;		/* skip over sender unique id */
		*(u32*)arp_ptr = arp1394->sip;	/* move sender IP addr */
		arp_ptr += arp->ar_pln;		/* skip over sender IP addr */

		if (arp->ar_op == htons(ARPOP_REQUEST))
			memset(arp_ptr, 0, sizeof(u64));
		else
			memcpy(arp_ptr, dev->dev_addr, sizeof(u64));
	}

	/* Now add the ethernet header. */
	if (dev->hard_header(skb, dev, ntohs(ether_type), &dest_hw, NULL,
			     skb->len) >= 0)
		ret = ether1394_type_trans(skb, dev);

	return ret;
}

static inline int fragment_overlap(struct list_head *frag_list, int offset, int len)
{
	struct fragment_info *fi;

	list_for_each_entry(fi, frag_list, list) {
		if ( ! ((offset > (fi->offset + fi->len - 1)) ||
		       ((offset + len - 1) < fi->offset)))
			return 1;
	}
	return 0;
}

static inline struct list_head *find_partial_datagram(struct list_head *pdgl, int dgl)
{
	struct partial_datagram *pd;

	list_for_each_entry(pd, pdgl, list) {
		if (pd->dgl == dgl)
			return &pd->list;
	}
	return NULL;
}

/* Assumes that new fragment does not overlap any existing fragments */
static inline int new_fragment(struct list_head *frag_info, int offset, int len)
{
	struct list_head *lh;
	struct fragment_info *fi, *fi2, *new;

	list_for_each(lh, frag_info) {
		fi = list_entry(lh, struct fragment_info, list);
		if ((fi->offset + fi->len) == offset) {
			/* The new fragment can be tacked on to the end */
			fi->len += len;
			/* Did the new fragment plug a hole? */
			fi2 = list_entry(lh->next, struct fragment_info, list);
			if ((fi->offset + fi->len) == fi2->offset) {
				/* glue fragments together */
				fi->len += fi2->len;
				list_del(lh->next);
				kfree(fi2);
			}
			return 0;
		} else if ((offset + len) == fi->offset) {
			/* The new fragment can be tacked on to the beginning */
			fi->offset = offset;
			fi->len += len;
			/* Did the new fragment plug a hole? */
			fi2 = list_entry(lh->prev, struct fragment_info, list);
			if ((fi2->offset + fi2->len) == fi->offset) {
				/* glue fragments together */
				fi2->len += fi->len;
				list_del(lh);
				kfree(fi);
			}
			return 0;
		} else if (offset > (fi->offset + fi->len)) {
			break;
		} else if ((offset + len) < fi->offset) {
			lh = lh->prev;
			break;
		}
	}

	new = kmalloc(sizeof(*new), GFP_ATOMIC);
	if (!new)
		return -ENOMEM;

	new->offset = offset;
	new->len = len;

	list_add(&new->list, lh);

	return 0;
}

static inline int new_partial_datagram(struct net_device *dev,
				       struct list_head *pdgl, int dgl,
				       int dg_size, char *frag_buf,
				       int frag_off, int frag_len)
{
	struct partial_datagram *new;

	new = kmalloc(sizeof(*new), GFP_ATOMIC);
	if (!new)
		return -ENOMEM;

	INIT_LIST_HEAD(&new->frag_info);

	if (new_fragment(&new->frag_info, frag_off, frag_len) < 0) {
		kfree(new);
		return -ENOMEM;
	}

	new->dgl = dgl;
	new->dg_size = dg_size;

	new->skb = dev_alloc_skb(dg_size + dev->hard_header_len + 15);
	if (!new->skb) {
		struct fragment_info *fi = list_entry(new->frag_info.next,
						      struct fragment_info,
						      list);
		kfree(fi);
		kfree(new);
		return -ENOMEM;
	}

	skb_reserve(new->skb, (dev->hard_header_len + 15) & ~15);
	new->pbuf = skb_put(new->skb, dg_size);
	memcpy(new->pbuf + frag_off, frag_buf, frag_len);

	list_add(&new->list, pdgl);

	return 0;
}

static inline int update_partial_datagram(struct list_head *pdgl, struct list_head *lh,
					  char *frag_buf, int frag_off, int frag_len)
{
	struct partial_datagram *pd = list_entry(lh, struct partial_datagram, list);

	if (new_fragment(&pd->frag_info, frag_off, frag_len) < 0) {
		return -ENOMEM;
	}

	memcpy(pd->pbuf + frag_off, frag_buf, frag_len);

	/* Move list entry to beginnig of list so that oldest partial
	 * datagrams percolate to the end of the list */
	list_move(lh, pdgl);

	return 0;
}

static inline int is_datagram_complete(struct list_head *lh, int dg_size)
{
	struct partial_datagram *pd = list_entry(lh, struct partial_datagram, list);
	struct fragment_info *fi = list_entry(pd->frag_info.next,
					      struct fragment_info, list);

	return (fi->len == dg_size);
}

/* Packet reception. We convert the IP1394 encapsulation header to an
 * ethernet header, and fill it with some of our other fields. This is
 * an incoming packet from the 1394 bus.  */
static int ether1394_data_handler(struct net_device *dev, int srcid, int destid,
				  char *buf, int len)
{
	struct sk_buff *skb;
	unsigned long flags;
	struct eth1394_priv *priv = netdev_priv(dev);
	union eth1394_hdr *hdr = (union eth1394_hdr *)buf;
	u16 ether_type = 0;  /* initialized to clear warning */
	int hdr_len;
	struct unit_directory *ud = priv->ud_list[NODEID_TO_NODE(srcid)];
	struct eth1394_node_info *node_info;

	if (!ud) {
		struct eth1394_node_ref *node;
		node = eth1394_find_node_nodeid(&priv->ip_node_list, srcid);
		if (!node) {
			HPSB_PRINT(KERN_ERR, "ether1394 rx: sender nodeid "
				   "lookup failure: " NODE_BUS_FMT,
				   NODE_BUS_ARGS(priv->host, srcid));
			priv->stats.rx_dropped++;
			return -1;
		}
		ud = node->ud;

		priv->ud_list[NODEID_TO_NODE(srcid)] = ud;
	}

	node_info = (struct eth1394_node_info*)ud->device.driver_data;

	/* First, did we receive a fragmented or unfragmented datagram? */
	hdr->words.word1 = ntohs(hdr->words.word1);

	hdr_len = hdr_type_len[hdr->common.lf];

	if (hdr->common.lf == ETH1394_HDR_LF_UF) {
		/* An unfragmented datagram has been received by the ieee1394
		 * bus. Build an skbuff around it so we can pass it to the
		 * high level network layer. */

		skb = dev_alloc_skb(len + dev->hard_header_len + 15);
		if (!skb) {
			HPSB_PRINT (KERN_ERR, "ether1394 rx: low on mem\n");
			priv->stats.rx_dropped++;
			return -1;
		}
		skb_reserve(skb, (dev->hard_header_len + 15) & ~15);
		memcpy(skb_put(skb, len - hdr_len), buf + hdr_len, len - hdr_len);
		ether_type = hdr->uf.ether_type;
	} else {
		/* A datagram fragment has been received, now the fun begins. */

		struct list_head *pdgl, *lh;
		struct partial_datagram *pd;
		int fg_off;
		int fg_len = len - hdr_len;
		int dg_size;
		int dgl;
		int retval;
		struct pdg_list *pdg = &(node_info->pdg);

		hdr->words.word3 = ntohs(hdr->words.word3);
		/* The 4th header word is reserved so no need to do ntohs() */

		if (hdr->common.lf == ETH1394_HDR_LF_FF) {
			ether_type = hdr->ff.ether_type;
			dgl = hdr->ff.dgl;
			dg_size = hdr->ff.dg_size + 1;
			fg_off = 0;
		} else {
			hdr->words.word2 = ntohs(hdr->words.word2);
			dgl = hdr->sf.dgl;
			dg_size = hdr->sf.dg_size + 1;
			fg_off = hdr->sf.fg_off;
		}
		spin_lock_irqsave(&pdg->lock, flags);

		pdgl = &(pdg->list);
		lh = find_partial_datagram(pdgl, dgl);

		if (lh == NULL) {
			while (pdg->sz >= max_partial_datagrams) {
				/* remove the oldest */
				purge_partial_datagram(pdgl->prev);
				pdg->sz--;
			}

			retval = new_partial_datagram(dev, pdgl, dgl, dg_size,
						      buf + hdr_len, fg_off,
						      fg_len);
			if (retval < 0) {
				spin_unlock_irqrestore(&pdg->lock, flags);
				goto bad_proto;
			}
			pdg->sz++;
			lh = find_partial_datagram(pdgl, dgl);
		} else {
			struct partial_datagram *pd;

			pd = list_entry(lh, struct partial_datagram, list);

			if (fragment_overlap(&pd->frag_info, fg_off, fg_len)) {
				/* Overlapping fragments, obliterate old
				 * datagram and start new one. */
				purge_partial_datagram(lh);
				retval = new_partial_datagram(dev, pdgl, dgl,
							      dg_size,
							      buf + hdr_len,
							      fg_off, fg_len);
				if (retval < 0) {
					pdg->sz--;
					spin_unlock_irqrestore(&pdg->lock, flags);
					goto bad_proto;
				}
			} else {
				retval = update_partial_datagram(pdgl, lh,
								 buf + hdr_len,
								 fg_off, fg_len);
				if (retval < 0) {
					/* Couldn't save off fragment anyway
					 * so might as well obliterate the
					 * datagram now. */
					purge_partial_datagram(lh);
					pdg->sz--;
					spin_unlock_irqrestore(&pdg->lock, flags);
					goto bad_proto;
				}
			} /* fragment overlap */
		} /* new datagram or add to existing one */

		pd = list_entry(lh, struct partial_datagram, list);

		if (hdr->common.lf == ETH1394_HDR_LF_FF) {
			pd->ether_type = ether_type;
		}

		if (is_datagram_complete(lh, dg_size)) {
			ether_type = pd->ether_type;
			pdg->sz--;
			skb = skb_get(pd->skb);
			purge_partial_datagram(lh);
			spin_unlock_irqrestore(&pdg->lock, flags);
		} else {
			/* Datagram is not complete, we're done for the
			 * moment. */
			spin_unlock_irqrestore(&pdg->lock, flags);
			return 0;
		}
	} /* unframgented datagram or fragmented one */

	/* Write metadata, and then pass to the receive level */
	skb->dev = dev;
	skb->ip_summed = CHECKSUM_UNNECESSARY;	/* don't check it */

	/* Parse the encapsulation header. This actually does the job of
	 * converting to an ethernet frame header, aswell as arp
	 * conversion if needed. ARP conversion is easier in this
	 * direction, since we are using ethernet as our backend.  */
	skb->protocol = ether1394_parse_encap(skb, dev, srcid, destid,
					      ether_type);


	spin_lock_irqsave(&priv->lock, flags);
	if (!skb->protocol) {
		priv->stats.rx_errors++;
		priv->stats.rx_dropped++;
		dev_kfree_skb_any(skb);
		goto bad_proto;
	}

	if (netif_rx(skb) == NET_RX_DROP) {
		priv->stats.rx_errors++;
		priv->stats.rx_dropped++;
		goto bad_proto;
	}

	/* Statistics */
	priv->stats.rx_packets++;
	priv->stats.rx_bytes += skb->len;

bad_proto:
	if (netif_queue_stopped(dev))
		netif_wake_queue(dev);
	spin_unlock_irqrestore(&priv->lock, flags);

	dev->last_rx = jiffies;

	return 0;
}

static int ether1394_write(struct hpsb_host *host, int srcid, int destid,
			   quadlet_t *data, u64 addr, size_t len, u16 flags)
{
	struct eth1394_host_info *hi;

	hi = hpsb_get_hostinfo(&eth1394_highlevel, host);
	if (hi == NULL) {
		ETH1394_PRINT_G(KERN_ERR, "Could not find net device for host %s\n",
				host->driver->name);
		return RCODE_ADDRESS_ERROR;
	}

	if (ether1394_data_handler(hi->dev, srcid, destid, (char*)data, len))
		return RCODE_ADDRESS_ERROR;
	else
		return RCODE_COMPLETE;
}

static void ether1394_iso(struct hpsb_iso *iso)
{
	quadlet_t *data;
	char *buf;
	struct eth1394_host_info *hi;
	struct net_device *dev;
	struct eth1394_priv *priv;
	unsigned int len;
	u32 specifier_id;
	u16 source_id;
	int i;
	int nready;

	hi = hpsb_get_hostinfo(&eth1394_highlevel, iso->host);
	if (hi == NULL) {
		ETH1394_PRINT_G(KERN_ERR, "Could not find net device for host %s\n",
				iso->host->driver->name);
		return;
	}

	dev = hi->dev;

	nready = hpsb_iso_n_ready(iso);
	for (i = 0; i < nready; i++) {
		struct hpsb_iso_packet_info *info =
			&iso->infos[(iso->first_packet + i) % iso->buf_packets];
		data = (quadlet_t*) (iso->data_buf.kvirt + info->offset);

		/* skip over GASP header */
		buf = (char *)data + 8;
		len = info->len - 8;

		specifier_id = (((be32_to_cpu(data[0]) & 0xffff) << 8) |
				((be32_to_cpu(data[1]) & 0xff000000) >> 24));
		source_id = be32_to_cpu(data[0]) >> 16;

		priv = netdev_priv(dev);

		if (info->channel != (iso->host->csr.broadcast_channel & 0x3f) ||
		   specifier_id != ETHER1394_GASP_SPECIFIER_ID) {
			/* This packet is not for us */
			continue;
		}
		ether1394_data_handler(dev, source_id, LOCAL_BUS | ALL_NODES,
				       buf, len);
	}

	hpsb_iso_recv_release_packets(iso, i);

	dev->last_rx = jiffies;
}

/******************************************
 * Datagram transmission code
 ******************************************/

/* Convert a standard ARP packet to 1394 ARP. The first 8 bytes (the entire
 * arphdr) is the same format as the ip1394 header, so they overlap.  The rest
 * needs to be munged a bit.  The remainder of the arphdr is formatted based
 * on hwaddr len and ipaddr len.  We know what they'll be, so it's easy to
 * judge.
 *
 * Now that the EUI is used for the hardware address all we need to do to make
 * this work for 1394 is to insert 2 quadlets that contain max_rec size,
 * speed, and unicast FIFO address information between the sender_unique_id
 * and the IP addresses.
 */
static inline void ether1394_arp_to_1394arp(struct sk_buff *skb,
					    struct net_device *dev)
{
	struct eth1394_priv *priv = netdev_priv(dev);

	struct arphdr *arp = (struct arphdr *)skb->data;
	unsigned char *arp_ptr = (unsigned char *)(arp + 1);
	struct eth1394_arp *arp1394 = (struct eth1394_arp *)skb->data;

	/* Believe it or not, all that need to happen is sender IP get moved
	 * and set hw_addr_len, max_rec, sspd, fifo_hi and fifo_lo.  */
	arp1394->hw_addr_len	= 16;
	arp1394->sip		= *(u32*)(arp_ptr + ETH1394_ALEN);
	arp1394->max_rec	= priv->host->csr.max_rec;
	arp1394->sspd		= priv->host->csr.lnk_spd;
	arp1394->fifo_hi	= htons (priv->local_fifo >> 32);
	arp1394->fifo_lo	= htonl (priv->local_fifo & ~0x0);

	return;
}

/* We need to encapsulate the standard header with our own. We use the
 * ethernet header's proto for our own. */
static inline unsigned int ether1394_encapsulate_prep(unsigned int max_payload,
						      __be16 proto,
						      union eth1394_hdr *hdr,
						      u16 dg_size, u16 dgl)
{
	unsigned int adj_max_payload = max_payload - hdr_type_len[ETH1394_HDR_LF_UF];

	/* Does it all fit in one packet? */
	if (dg_size <= adj_max_payload) {
		hdr->uf.lf = ETH1394_HDR_LF_UF;
		hdr->uf.ether_type = proto;
	} else {
		hdr->ff.lf = ETH1394_HDR_LF_FF;
		hdr->ff.ether_type = proto;
		hdr->ff.dg_size = dg_size - 1;
		hdr->ff.dgl = dgl;
		adj_max_payload = max_payload - hdr_type_len[ETH1394_HDR_LF_FF];
	}
	return((dg_size + (adj_max_payload - 1)) / adj_max_payload);
}

static inline unsigned int ether1394_encapsulate(struct sk_buff *skb,
						 unsigned int max_payload,
						 union eth1394_hdr *hdr)
{
	union eth1394_hdr *bufhdr;
	int ftype = hdr->common.lf;
	int hdrsz = hdr_type_len[ftype];
	unsigned int adj_max_payload = max_payload - hdrsz;

	switch(ftype) {
	case ETH1394_HDR_LF_UF:
		bufhdr = (union eth1394_hdr *)skb_push(skb, hdrsz);
		bufhdr->words.word1 = htons(hdr->words.word1);
		bufhdr->words.word2 = hdr->words.word2;
		break;

	case ETH1394_HDR_LF_FF:
		bufhdr = (union eth1394_hdr *)skb_push(skb, hdrsz);
		bufhdr->words.word1 = htons(hdr->words.word1);
		bufhdr->words.word2 = hdr->words.word2;
		bufhdr->words.word3 = htons(hdr->words.word3);
		bufhdr->words.word4 = 0;

		/* Set frag type here for future interior fragments */
		hdr->common.lf = ETH1394_HDR_LF_IF;
		hdr->sf.fg_off = 0;
		break;

	default:
		hdr->sf.fg_off += adj_max_payload;
		bufhdr = (union eth1394_hdr *)skb_pull(skb, adj_max_payload);
		if (max_payload >= skb->len)
			hdr->common.lf = ETH1394_HDR_LF_LF;
		bufhdr->words.word1 = htons(hdr->words.word1);
		bufhdr->words.word2 = htons(hdr->words.word2);
		bufhdr->words.word3 = htons(hdr->words.word3);
		bufhdr->words.word4 = 0;
	}

	return min(max_payload, skb->len);
}

static inline struct hpsb_packet *ether1394_alloc_common_packet(struct hpsb_host *host)
{
	struct hpsb_packet *p;

	p = hpsb_alloc_packet(0);
	if (p) {
		p->host = host;
		p->generation = get_hpsb_generation(host);
		p->type = hpsb_async;
	}
	return p;
}

static inline int ether1394_prep_write_packet(struct hpsb_packet *p,
					      struct hpsb_host *host,
					      nodeid_t node, u64 addr,
					      void * data, int tx_len)
{
	p->node_id = node;
	p->data = NULL;

	p->tcode = TCODE_WRITEB;
	p->header[1] = (host->node_id << 16) | (addr >> 32);
	p->header[2] = addr & 0xffffffff;

	p->header_size = 16;
	p->expect_response = 1;

	if (hpsb_get_tlabel(p)) {
		ETH1394_PRINT_G(KERN_ERR, "No more tlabels left while sending "
				"to node " NODE_BUS_FMT "\n", NODE_BUS_ARGS(host, node));
		return -1;
	}
	p->header[0] = (p->node_id << 16) | (p->tlabel << 10)
		| (1 << 8) | (TCODE_WRITEB << 4);

	p->header[3] = tx_len << 16;
	p->data_size = (tx_len + 3) & ~3;
	p->data = (quadlet_t*)data;

	return 0;
}

static inline void ether1394_prep_gasp_packet(struct hpsb_packet *p,
					      struct eth1394_priv *priv,
					      struct sk_buff *skb, int length)
{
	p->header_size = 4;
	p->tcode = TCODE_STREAM_DATA;

	p->header[0] = (length << 16) | (3 << 14)
		| ((priv->broadcast_channel) << 8)
		| (TCODE_STREAM_DATA << 4);
	p->data_size = length;
	p->data = ((quadlet_t*)skb->data) - 2;
	p->data[0] = cpu_to_be32((priv->host->node_id << 16) |
				 ETHER1394_GASP_SPECIFIER_ID_HI);
	p->data[1] = cpu_to_be32((ETHER1394_GASP_SPECIFIER_ID_LO << 24) |
				 ETHER1394_GASP_VERSION);

	/* Setting the node id to ALL_NODES (not LOCAL_BUS | ALL_NODES)
	 * prevents hpsb_send_packet() from setting the speed to an arbitrary
	 * value based on packet->node_id if packet->node_id is not set. */
	p->node_id = ALL_NODES;
	p->speed_code = priv->bc_sspd;
}

static inline void ether1394_free_packet(struct hpsb_packet *packet)
{
	if (packet->tcode != TCODE_STREAM_DATA)
		hpsb_free_tlabel(packet);
	hpsb_free_packet(packet);
}

static void ether1394_complete_cb(void *__ptask);

static int ether1394_send_packet(struct packet_task *ptask, unsigned int tx_len)
{
	struct eth1394_priv *priv = ptask->priv;
	struct hpsb_packet *packet = NULL;

	packet = ether1394_alloc_common_packet(priv->host);
	if (!packet)
		return -1;

	if (ptask->tx_type == ETH1394_GASP) {
		int length = tx_len + (2 * sizeof(quadlet_t));

		ether1394_prep_gasp_packet(packet, priv, ptask->skb, length);
	} else if (ether1394_prep_write_packet(packet, priv->host,
					       ptask->dest_node,
					       ptask->addr, ptask->skb->data,
					       tx_len)) {
		hpsb_free_packet(packet);
		return -1;
	}

	ptask->packet = packet;
	hpsb_set_packet_complete_task(ptask->packet, ether1394_complete_cb,
				      ptask);

	if (hpsb_send_packet(packet) < 0) {
		ether1394_free_packet(packet);
		return -1;
	}

	return 0;
}


/* Task function to be run when a datagram transmission is completed */
static inline void ether1394_dg_complete(struct packet_task *ptask, int fail)
{
	struct sk_buff *skb = ptask->skb;
	struct net_device *dev = skb->dev;
	struct eth1394_priv *priv = netdev_priv(dev);
	unsigned long flags;

	/* Statistics */
	spin_lock_irqsave(&priv->lock, flags);
	if (fail) {
		priv->stats.tx_dropped++;
		priv->stats.tx_errors++;
	} else {
		priv->stats.tx_bytes += skb->len;
		priv->stats.tx_packets++;
	}
	spin_unlock_irqrestore(&priv->lock, flags);

	dev_kfree_skb_any(skb);
	kmem_cache_free(packet_task_cache, ptask);
}


/* Callback for when a packet has been sent and the status of that packet is
 * known */
static void ether1394_complete_cb(void *__ptask)
{
	struct packet_task *ptask = (struct packet_task *)__ptask;
	struct hpsb_packet *packet = ptask->packet;
	int fail = 0;

	if (packet->tcode != TCODE_STREAM_DATA)
		fail = hpsb_packet_success(packet);

	ether1394_free_packet(packet);

	ptask->outstanding_pkts--;
	if (ptask->outstanding_pkts > 0 && !fail) {
		int tx_len;

		/* Add the encapsulation header to the fragment */
		tx_len = ether1394_encapsulate(ptask->skb, ptask->max_payload,
					       &ptask->hdr);
		if (ether1394_send_packet(ptask, tx_len))
			ether1394_dg_complete(ptask, 1);
	} else {
		ether1394_dg_complete(ptask, fail);
	}
}



/* Transmit a packet (called by kernel) */
static int ether1394_tx (struct sk_buff *skb, struct net_device *dev)
{
	gfp_t kmflags = in_interrupt() ? GFP_ATOMIC : GFP_KERNEL;
	struct eth1394hdr *eth;
	struct eth1394_priv *priv = netdev_priv(dev);
	__be16 proto;
	unsigned long flags;
	nodeid_t dest_node;
	eth1394_tx_type tx_type;
	int ret = 0;
	unsigned int tx_len;
	unsigned int max_payload;
	u16 dg_size;
	u16 dgl;
	struct packet_task *ptask;
	struct eth1394_node_ref *node;
	struct eth1394_node_info *node_info = NULL;

	ptask = kmem_cache_alloc(packet_task_cache, kmflags);
	if (ptask == NULL) {
		ret = -ENOMEM;
		goto fail;
	}

	/* XXX Ignore this for now. Noticed that when MacOSX is the IRM,
	 * it does not set our validity bit. We need to compensate for
	 * that somewhere else, but not in eth1394. */
#if 0
	if ((priv->host->csr.broadcast_channel & 0xc0000000) != 0xc0000000) {
		ret = -EAGAIN;
		goto fail;
	}
#endif

	if ((skb = skb_share_check (skb, kmflags)) == NULL) {
		ret = -ENOMEM;
		goto fail;
	}

	/* Get rid of the fake eth1394 header, but save a pointer */
	eth = (struct eth1394hdr*)skb->data;
	skb_pull(skb, ETH1394_HLEN);

	proto = eth->h_proto;
	dg_size = skb->len;

	/* Set the transmission type for the packet.  ARP packets and IP
	 * broadcast packets are sent via GASP. */
	if (memcmp(eth->h_dest, dev->broadcast, ETH1394_ALEN) == 0 ||
	    proto == htons(ETH_P_ARP) ||
	    (proto == htons(ETH_P_IP) &&
	     IN_MULTICAST(ntohl(skb->nh.iph->daddr)))) {
		tx_type = ETH1394_GASP;
		dest_node = LOCAL_BUS | ALL_NODES;
		max_payload = priv->bc_maxpayload - ETHER1394_GASP_OVERHEAD;
		BUG_ON(max_payload < (512 - ETHER1394_GASP_OVERHEAD));
		dgl = priv->bc_dgl;
		if (max_payload < dg_size + hdr_type_len[ETH1394_HDR_LF_UF])
			priv->bc_dgl++;
	} else {
		__be64 guid = get_unaligned((u64 *)eth->h_dest);

		node = eth1394_find_node_guid(&priv->ip_node_list,
					      be64_to_cpu(guid));
		if (!node) {
			ret = -EAGAIN;
			goto fail;
		}
		node_info = (struct eth1394_node_info*)node->ud->device.driver_data;
		if (node_info->fifo == CSR1212_INVALID_ADDR_SPACE) {
			ret = -EAGAIN;
			goto fail;
		}

		dest_node = node->ud->ne->nodeid;
		max_payload = node_info->maxpayload;
		BUG_ON(max_payload < (512 - ETHER1394_GASP_OVERHEAD));

		dgl = node_info->dgl;
		if (max_payload < dg_size + hdr_type_len[ETH1394_HDR_LF_UF])
			node_info->dgl++;
		tx_type = ETH1394_WRREQ;
	}

	/* If this is an ARP packet, convert it */
	if (proto == htons(ETH_P_ARP))
		ether1394_arp_to_1394arp (skb, dev);

	ptask->hdr.words.word1 = 0;
	ptask->hdr.words.word2 = 0;
	ptask->hdr.words.word3 = 0;
	ptask->hdr.words.word4 = 0;
	ptask->skb = skb;
	ptask->priv = priv;
	ptask->tx_type = tx_type;

	if (tx_type != ETH1394_GASP) {
		u64 addr;

		spin_lock_irqsave(&priv->lock, flags);
		addr = node_info->fifo;
		spin_unlock_irqrestore(&priv->lock, flags);

		ptask->addr = addr;
		ptask->dest_node = dest_node;
	}

	ptask->tx_type = tx_type;
	ptask->max_payload = max_payload;
        ptask->outstanding_pkts = ether1394_encapsulate_prep(max_payload, proto,
							     &ptask->hdr, dg_size,
							     dgl);

	/* Add the encapsulation header to the fragment */
	tx_len = ether1394_encapsulate(skb, max_payload, &ptask->hdr);
	dev->trans_start = jiffies;
	if (ether1394_send_packet(ptask, tx_len))
		goto fail;

	netif_wake_queue(dev);
	return 0;
fail:
	if (ptask)
		kmem_cache_free(packet_task_cache, ptask);

	if (skb != NULL)
		dev_kfree_skb(skb);

	spin_lock_irqsave (&priv->lock, flags);
	priv->stats.tx_dropped++;
	priv->stats.tx_errors++;
	spin_unlock_irqrestore (&priv->lock, flags);

	if (netif_queue_stopped(dev))
		netif_wake_queue(dev);

	return 0;  /* returning non-zero causes serious problems */
}

static void ether1394_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
{
	strcpy (info->driver, driver_name);
	/* FIXME XXX provide sane businfo */
	strcpy (info->bus_info, "ieee1394");
}

static struct ethtool_ops ethtool_ops = {
	.get_drvinfo = ether1394_get_drvinfo
};

static int __init ether1394_init_module (void)
{
	packet_task_cache = kmem_cache_create("packet_task", sizeof(struct packet_task),
					      0, 0, NULL, NULL);

	/* Register ourselves as a highlevel driver */
	hpsb_register_highlevel(&eth1394_highlevel);

	return hpsb_register_protocol(&eth1394_proto_driver);
}

static void __exit ether1394_exit_module (void)
{
	hpsb_unregister_protocol(&eth1394_proto_driver);
	hpsb_unregister_highlevel(&eth1394_highlevel);
	kmem_cache_destroy(packet_task_cache);
}

module_init(ether1394_init_module);
module_exit(ether1394_exit_module);