aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/scsi/scsi_transport_fc.c
blob: 3571ce8934e7af15f8924a832c6be7047fbbecb4 (plain) (blame)
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
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
/* 
 *  FiberChannel transport specific attributes exported to sysfs.
 *
 *  Copyright (c) 2003 Silicon Graphics, Inc.  All rights reserved.
 *
 *  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
 *
 *  ========
 *
 *  Copyright (C) 2004-2005   James Smart, Emulex Corporation
 *    Rewrite for host, target, device, and remote port attributes,
 *    statistics, and service functions...
 *
 */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/sched.h>	/* workqueue stuff, HZ */
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_fc.h>
#include <scsi/scsi_cmnd.h>
#include <linux/netlink.h>
#include <net/netlink.h>
#include <scsi/scsi_netlink_fc.h>
#include "scsi_priv.h"

static int fc_queue_work(struct Scsi_Host *, struct work_struct *);

/*
 * Redefine so that we can have same named attributes in the
 * sdev/starget/host objects.
 */
#define FC_CLASS_DEVICE_ATTR(_prefix,_name,_mode,_show,_store)		\
struct class_device_attribute class_device_attr_##_prefix##_##_name = 	\
	__ATTR(_name,_mode,_show,_store)

#define fc_enum_name_search(title, table_type, table)			\
static const char *get_fc_##title##_name(enum table_type table_key)	\
{									\
	int i;								\
	char *name = NULL;						\
									\
	for (i = 0; i < ARRAY_SIZE(table); i++) {			\
		if (table[i].value == table_key) {			\
			name = table[i].name;				\
			break;						\
		}							\
	}								\
	return name;							\
}

#define fc_enum_name_match(title, table_type, table)			\
static int get_fc_##title##_match(const char *table_key,		\
		enum table_type *value)					\
{									\
	int i;								\
									\
	for (i = 0; i < ARRAY_SIZE(table); i++) {			\
		if (strncmp(table_key, table[i].name,			\
				table[i].matchlen) == 0) {		\
			*value = table[i].value;			\
			return 0; /* success */				\
		}							\
	}								\
	return 1; /* failure */						\
}


/* Convert fc_port_type values to ascii string name */
static struct {
	enum fc_port_type	value;
	char			*name;
} fc_port_type_names[] = {
	{ FC_PORTTYPE_UNKNOWN,		"Unknown" },
	{ FC_PORTTYPE_OTHER,		"Other" },
	{ FC_PORTTYPE_NOTPRESENT,	"Not Present" },
	{ FC_PORTTYPE_NPORT,	"NPort (fabric via point-to-point)" },
	{ FC_PORTTYPE_NLPORT,	"NLPort (fabric via loop)" },
	{ FC_PORTTYPE_LPORT,	"LPort (private loop)" },
	{ FC_PORTTYPE_PTP,	"Point-To-Point (direct nport connection" },
};
fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
#define FC_PORTTYPE_MAX_NAMELEN		50


/* Convert fc_host_event_code values to ascii string name */
static const struct {
	enum fc_host_event_code		value;
	char				*name;
} fc_host_event_code_names[] = {
	{ FCH_EVT_LIP,			"lip" },
	{ FCH_EVT_LINKUP,		"link_up" },
	{ FCH_EVT_LINKDOWN,		"link_down" },
	{ FCH_EVT_LIPRESET,		"lip_reset" },
	{ FCH_EVT_RSCN,			"rscn" },
	{ FCH_EVT_ADAPTER_CHANGE,	"adapter_chg" },
	{ FCH_EVT_PORT_UNKNOWN,		"port_unknown" },
	{ FCH_EVT_PORT_ONLINE,		"port_online" },
	{ FCH_EVT_PORT_OFFLINE,		"port_offline" },
	{ FCH_EVT_PORT_FABRIC,		"port_fabric" },
	{ FCH_EVT_LINK_UNKNOWN,		"link_unknown" },
	{ FCH_EVT_VENDOR_UNIQUE,	"vendor_unique" },
};
fc_enum_name_search(host_event_code, fc_host_event_code,
		fc_host_event_code_names)
#define FC_HOST_EVENT_CODE_MAX_NAMELEN	30


/* Convert fc_port_state values to ascii string name */
static struct {
	enum fc_port_state	value;
	char			*name;
} fc_port_state_names[] = {
	{ FC_PORTSTATE_UNKNOWN,		"Unknown" },
	{ FC_PORTSTATE_NOTPRESENT,	"Not Present" },
	{ FC_PORTSTATE_ONLINE,		"Online" },
	{ FC_PORTSTATE_OFFLINE,		"Offline" },
	{ FC_PORTSTATE_BLOCKED,		"Blocked" },
	{ FC_PORTSTATE_BYPASSED,	"Bypassed" },
	{ FC_PORTSTATE_DIAGNOSTICS,	"Diagnostics" },
	{ FC_PORTSTATE_LINKDOWN,	"Linkdown" },
	{ FC_PORTSTATE_ERROR,		"Error" },
	{ FC_PORTSTATE_LOOPBACK,	"Loopback" },
	{ FC_PORTSTATE_DELETED,		"Deleted" },
};
fc_enum_name_search(port_state, fc_port_state, fc_port_state_names)
#define FC_PORTSTATE_MAX_NAMELEN	20


/* Convert fc_tgtid_binding_type values to ascii string name */
static const struct {
	enum fc_tgtid_binding_type	value;
	char				*name;
	int				matchlen;
} fc_tgtid_binding_type_names[] = {
	{ FC_TGTID_BIND_NONE, "none", 4 },
	{ FC_TGTID_BIND_BY_WWPN, "wwpn (World Wide Port Name)", 4 },
	{ FC_TGTID_BIND_BY_WWNN, "wwnn (World Wide Node Name)", 4 },
	{ FC_TGTID_BIND_BY_ID, "port_id (FC Address)", 7 },
};
fc_enum_name_search(tgtid_bind_type, fc_tgtid_binding_type,
		fc_tgtid_binding_type_names)
fc_enum_name_match(tgtid_bind_type, fc_tgtid_binding_type,
		fc_tgtid_binding_type_names)
#define FC_BINDTYPE_MAX_NAMELEN	30


#define fc_bitfield_name_search(title, table)			\
static ssize_t							\
get_fc_##title##_names(u32 table_key, char *buf)		\
{								\
	char *prefix = "";					\
	ssize_t len = 0;					\
	int i;							\
								\
	for (i = 0; i < ARRAY_SIZE(table); i++) {		\
		if (table[i].value & table_key) {		\
			len += sprintf(buf + len, "%s%s",	\
				prefix, table[i].name);		\
			prefix = ", ";				\
		}						\
	}							\
	len += sprintf(buf + len, "\n");			\
	return len;						\
}


/* Convert FC_COS bit values to ascii string name */
static const struct {
	u32 			value;
	char			*name;
} fc_cos_names[] = {
	{ FC_COS_CLASS1,	"Class 1" },
	{ FC_COS_CLASS2,	"Class 2" },
	{ FC_COS_CLASS3,	"Class 3" },
	{ FC_COS_CLASS4,	"Class 4" },
	{ FC_COS_CLASS6,	"Class 6" },
};
fc_bitfield_name_search(cos, fc_cos_names)


/* Convert FC_PORTSPEED bit values to ascii string name */
static const struct {
	u32 			value;
	char			*name;
} fc_port_speed_names[] = {
	{ FC_PORTSPEED_1GBIT,		"1 Gbit" },
	{ FC_PORTSPEED_2GBIT,		"2 Gbit" },
	{ FC_PORTSPEED_4GBIT,		"4 Gbit" },
	{ FC_PORTSPEED_10GBIT,		"10 Gbit" },
	{ FC_PORTSPEED_NOT_NEGOTIATED,	"Not Negotiated" },
};
fc_bitfield_name_search(port_speed, fc_port_speed_names)


static int
show_fc_fc4s (char *buf, u8 *fc4_list)
{
	int i, len=0;

	for (i = 0; i < FC_FC4_LIST_SIZE; i++, fc4_list++)
		len += sprintf(buf + len , "0x%02x ", *fc4_list);
	len += sprintf(buf + len, "\n");
	return len;
}


/* Convert FC_RPORT_ROLE bit values to ascii string name */
static const struct {
	u32 			value;
	char			*name;
} fc_remote_port_role_names[] = {
	{ FC_RPORT_ROLE_FCP_TARGET,	"FCP Target" },
	{ FC_RPORT_ROLE_FCP_INITIATOR,	"FCP Initiator" },
	{ FC_RPORT_ROLE_IP_PORT,	"IP Port" },
};
fc_bitfield_name_search(remote_port_roles, fc_remote_port_role_names)

/*
 * Define roles that are specific to port_id. Values are relative to ROLE_MASK.
 */
#define FC_WELLKNOWN_PORTID_MASK	0xfffff0
#define FC_WELLKNOWN_ROLE_MASK  	0x00000f
#define FC_FPORT_PORTID			0x00000e
#define FC_FABCTLR_PORTID		0x00000d
#define FC_DIRSRVR_PORTID		0x00000c
#define FC_TIMESRVR_PORTID		0x00000b
#define FC_MGMTSRVR_PORTID		0x00000a


static void fc_timeout_deleted_rport(struct work_struct *work);
static void fc_timeout_fail_rport_io(struct work_struct *work);
static void fc_scsi_scan_rport(struct work_struct *work);

/*
 * Attribute counts pre object type...
 * Increase these values if you add attributes
 */
#define FC_STARGET_NUM_ATTRS 	3
#define FC_RPORT_NUM_ATTRS	10
#define FC_HOST_NUM_ATTRS	17

struct fc_internal {
	struct scsi_transport_template t;
	struct fc_function_template *f;

	/*
	 * For attributes : each object has :
	 *   An array of the actual attributes structures
	 *   An array of null-terminated pointers to the attribute
	 *     structures - used for mid-layer interaction.
	 *
	 * The attribute containers for the starget and host are are
	 * part of the midlayer. As the remote port is specific to the
	 * fc transport, we must provide the attribute container.
	 */
	struct class_device_attribute private_starget_attrs[
							FC_STARGET_NUM_ATTRS];
	struct class_device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];

	struct class_device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
	struct class_device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];

	struct transport_container rport_attr_cont;
	struct class_device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
	struct class_device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
};

#define to_fc_internal(tmpl)	container_of(tmpl, struct fc_internal, t)

static int fc_target_setup(struct transport_container *tc, struct device *dev,
			   struct class_device *cdev)
{
	struct scsi_target *starget = to_scsi_target(dev);
	struct fc_rport *rport = starget_to_rport(starget);

	/*
	 * if parent is remote port, use values from remote port.
	 * Otherwise, this host uses the fc_transport, but not the
	 * remote port interface. As such, initialize to known non-values.
	 */
	if (rport) {
		fc_starget_node_name(starget) = rport->node_name;
		fc_starget_port_name(starget) = rport->port_name;
		fc_starget_port_id(starget) = rport->port_id;
	} else {
		fc_starget_node_name(starget) = -1;
		fc_starget_port_name(starget) = -1;
		fc_starget_port_id(starget) = -1;
	}

	return 0;
}

static DECLARE_TRANSPORT_CLASS(fc_transport_class,
			       "fc_transport",
			       fc_target_setup,
			       NULL,
			       NULL);

static int fc_host_setup(struct transport_container *tc, struct device *dev,
			 struct class_device *cdev)
{
	struct Scsi_Host *shost = dev_to_shost(dev);
	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);

	/* 
	 * Set default values easily detected by the midlayer as
	 * failure cases.  The scsi lldd is responsible for initializing
	 * all transport attributes to valid values per host.
	 */
	fc_host->node_name = -1;
	fc_host->port_name = -1;
	fc_host->permanent_port_name = -1;
	fc_host->supported_classes = FC_COS_UNSPECIFIED;
	memset(fc_host->supported_fc4s, 0,
		sizeof(fc_host->supported_fc4s));
	fc_host->supported_speeds = FC_PORTSPEED_UNKNOWN;
	fc_host->maxframe_size = -1;
	memset(fc_host->serial_number, 0,
		sizeof(fc_host->serial_number));

	fc_host->port_id = -1;
	fc_host->port_type = FC_PORTTYPE_UNKNOWN;
	fc_host->port_state = FC_PORTSTATE_UNKNOWN;
	memset(fc_host->active_fc4s, 0,
		sizeof(fc_host->active_fc4s));
	fc_host->speed = FC_PORTSPEED_UNKNOWN;
	fc_host->fabric_name = -1;
	memset(fc_host->symbolic_name, 0, sizeof(fc_host->symbolic_name));
	memset(fc_host->system_hostname, 0, sizeof(fc_host->system_hostname));

	fc_host->tgtid_bind_type = FC_TGTID_BIND_BY_WWPN;

	INIT_LIST_HEAD(&fc_host->rports);
	INIT_LIST_HEAD(&fc_host->rport_bindings);
	fc_host->next_rport_number = 0;
	fc_host->next_target_id = 0;

	snprintf(fc_host->work_q_name, KOBJ_NAME_LEN, "fc_wq_%d",
		shost->host_no);
	fc_host->work_q = create_singlethread_workqueue(
					fc_host->work_q_name);
	if (!fc_host->work_q)
		return -ENOMEM;

	snprintf(fc_host->devloss_work_q_name, KOBJ_NAME_LEN, "fc_dl_%d",
		shost->host_no);
	fc_host->devloss_work_q = create_singlethread_workqueue(
					fc_host->devloss_work_q_name);
	if (!fc_host->devloss_work_q) {
		destroy_workqueue(fc_host->work_q);
		fc_host->work_q = NULL;
		return -ENOMEM;
	}

	return 0;
}

static DECLARE_TRANSPORT_CLASS(fc_host_class,
			       "fc_host",
			       fc_host_setup,
			       NULL,
			       NULL);

/*
 * Setup and Remove actions for remote ports are handled
 * in the service functions below.
 */
static DECLARE_TRANSPORT_CLASS(fc_rport_class,
			       "fc_remote_ports",
			       NULL,
			       NULL,
			       NULL);

/*
 * Module Parameters
 */

/*
 * dev_loss_tmo: the default number of seconds that the FC transport
 *   should insulate the loss of a remote port.
 *   The maximum will be capped by the value of SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
 */
static unsigned int fc_dev_loss_tmo = 60;		/* seconds */

module_param_named(dev_loss_tmo, fc_dev_loss_tmo, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(dev_loss_tmo,
		 "Maximum number of seconds that the FC transport should"
		 " insulate the loss of a remote port. Once this value is"
		 " exceeded, the scsi target is removed. Value should be"
		 " between 1 and SCSI_DEVICE_BLOCK_MAX_TIMEOUT.");

/**
 * Netlink Infrastructure
 **/

static atomic_t fc_event_seq;

/**
 * fc_get_event_number - Obtain the next sequential FC event number
 *
 * Notes:
 *   We could have inline'd this, but it would have required fc_event_seq to
 *   be exposed. For now, live with the subroutine call.
 *   Atomic used to avoid lock/unlock...
 **/
u32
fc_get_event_number(void)
{
	return atomic_add_return(1, &fc_event_seq);
}
EXPORT_SYMBOL(fc_get_event_number);


/**
 * fc_host_post_event - called to post an even on an fc_host.
 *
 * @shost:		host the event occurred on
 * @event_number:	fc event number obtained from get_fc_event_number()
 * @event_code:		fc_host event being posted
 * @event_data:		32bits of data for the event being posted
 *
 * Notes:
 *	This routine assumes no locks are held on entry.
 **/
void
fc_host_post_event(struct Scsi_Host *shost, u32 event_number,
		enum fc_host_event_code event_code, u32 event_data)
{
	struct sk_buff *skb;
	struct nlmsghdr	*nlh;
	struct fc_nl_event *event;
	const char *name;
	u32 len, skblen;
	int err;

	if (!scsi_nl_sock) {
		err = -ENOENT;
		goto send_fail;
	}

	len = FC_NL_MSGALIGN(sizeof(*event));
	skblen = NLMSG_SPACE(len);

	skb = alloc_skb(skblen, GFP_KERNEL);
	if (!skb) {
		err = -ENOBUFS;
		goto send_fail;
	}

	nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
				skblen - sizeof(*nlh), 0);
	if (!nlh) {
		err = -ENOBUFS;
		goto send_fail_skb;
	}
	event = NLMSG_DATA(nlh);

	INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
				FC_NL_ASYNC_EVENT, len);
	event->seconds = get_seconds();
	event->vendor_id = 0;
	event->host_no = shost->host_no;
	event->event_datalen = sizeof(u32);	/* bytes */
	event->event_num = event_number;
	event->event_code = event_code;
	event->event_data = event_data;

	err = nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
			      GFP_KERNEL);
	if (err && (err != -ESRCH))	/* filter no recipient errors */
		/* nlmsg_multicast already kfree_skb'd */
		goto send_fail;

	return;

send_fail_skb:
	kfree_skb(skb);
send_fail:
	name = get_fc_host_event_code_name(event_code);
	printk(KERN_WARNING
		"%s: Dropped Event : host %d %s data 0x%08x - err %d\n",
		__FUNCTION__, shost->host_no,
		(name) ? name : "<unknown>", event_data, err);
	return;
}
EXPORT_SYMBOL(fc_host_post_event);


/**
 * fc_host_post_vendor_event - called to post a vendor unique event on
 *                             a fc_host
 *
 * @shost:		host the event occurred on
 * @event_number:	fc event number obtained from get_fc_event_number()
 * @data_len:		amount, in bytes, of vendor unique data
 * @data_buf:		pointer to vendor unique data
 *
 * Notes:
 *	This routine assumes no locks are held on entry.
 **/
void
fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
		u32 data_len, char * data_buf, u64 vendor_id)
{
	struct sk_buff *skb;
	struct nlmsghdr	*nlh;
	struct fc_nl_event *event;
	u32 len, skblen;
	int err;

	if (!scsi_nl_sock) {
		err = -ENOENT;
		goto send_vendor_fail;
	}

	len = FC_NL_MSGALIGN(sizeof(*event) + data_len);
	skblen = NLMSG_SPACE(len);

	skb = alloc_skb(skblen, GFP_KERNEL);
	if (!skb) {
		err = -ENOBUFS;
		goto send_vendor_fail;
	}

	nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
				skblen - sizeof(*nlh), 0);
	if (!nlh) {
		err = -ENOBUFS;
		goto send_vendor_fail_skb;
	}
	event = NLMSG_DATA(nlh);

	INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
				FC_NL_ASYNC_EVENT, len);
	event->seconds = get_seconds();
	event->vendor_id = vendor_id;
	event->host_no = shost->host_no;
	event->event_datalen = data_len;	/* bytes */
	event->event_num = event_number;
	event->event_code = FCH_EVT_VENDOR_UNIQUE;
	memcpy(&event->event_data, data_buf, data_len);

	err = nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
			      GFP_KERNEL);
	if (err && (err != -ESRCH))	/* filter no recipient errors */
		/* nlmsg_multicast already kfree_skb'd */
		goto send_vendor_fail;

	return;

send_vendor_fail_skb:
	kfree_skb(skb);
send_vendor_fail:
	printk(KERN_WARNING
		"%s: Dropped Event : host %d vendor_unique - err %d\n",
		__FUNCTION__, shost->host_no, err);
	return;
}
EXPORT_SYMBOL(fc_host_post_vendor_event);



static __init int fc_transport_init(void)
{
	int error;

	atomic_set(&fc_event_seq, 0);

	error = transport_class_register(&fc_host_class);
	if (error)
		return error;
	error = transport_class_register(&fc_rport_class);
	if (error)
		return error;
	return transport_class_register(&fc_transport_class);
}

static void __exit fc_transport_exit(void)
{
	transport_class_unregister(&fc_transport_class);
	transport_class_unregister(&fc_rport_class);
	transport_class_unregister(&fc_host_class);
}

/*
 * FC Remote Port Attribute Management
 */

#define fc_rport_show_function(field, format_string, sz, cast)		\
static ssize_t								\
show_fc_rport_##field (struct class_device *cdev, char *buf)		\
{									\
	struct fc_rport *rport = transport_class_to_rport(cdev);	\
	struct Scsi_Host *shost = rport_to_shost(rport);		\
	struct fc_internal *i = to_fc_internal(shost->transportt);	\
	if ((i->f->get_rport_##field) &&				\
	    !((rport->port_state == FC_PORTSTATE_BLOCKED) ||		\
	      (rport->port_state == FC_PORTSTATE_DELETED) ||		\
	      (rport->port_state == FC_PORTSTATE_NOTPRESENT)))		\
		i->f->get_rport_##field(rport);				\
	return snprintf(buf, sz, format_string, cast rport->field); 	\
}

#define fc_rport_store_function(field)					\
static ssize_t								\
store_fc_rport_##field(struct class_device *cdev, const char *buf,	\
			   size_t count)				\
{									\
	int val;							\
	struct fc_rport *rport = transport_class_to_rport(cdev);	\
	struct Scsi_Host *shost = rport_to_shost(rport);		\
	struct fc_internal *i = to_fc_internal(shost->transportt);	\
	char *cp;							\
	if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||		\
	    (rport->port_state == FC_PORTSTATE_DELETED) ||		\
	    (rport->port_state == FC_PORTSTATE_NOTPRESENT))		\
		return -EBUSY;						\
	val = simple_strtoul(buf, &cp, 0);				\
	if (*cp && (*cp != '\n'))					\
		return -EINVAL;						\
	i->f->set_rport_##field(rport, val);				\
	return count;							\
}

#define fc_rport_rd_attr(field, format_string, sz)			\
	fc_rport_show_function(field, format_string, sz, )		\
static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,			\
			 show_fc_rport_##field, NULL)

#define fc_rport_rd_attr_cast(field, format_string, sz, cast)		\
	fc_rport_show_function(field, format_string, sz, (cast))	\
static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,			\
			  show_fc_rport_##field, NULL)

#define fc_rport_rw_attr(field, format_string, sz)			\
	fc_rport_show_function(field, format_string, sz, )		\
	fc_rport_store_function(field)					\
static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR,		\
			show_fc_rport_##field,				\
			store_fc_rport_##field)


#define fc_private_rport_show_function(field, format_string, sz, cast)	\
static ssize_t								\
show_fc_rport_##field (struct class_device *cdev, char *buf)		\
{									\
	struct fc_rport *rport = transport_class_to_rport(cdev);	\
	return snprintf(buf, sz, format_string, cast rport->field); 	\
}

#define fc_private_rport_rd_attr(field, format_string, sz)		\
	fc_private_rport_show_function(field, format_string, sz, )	\
static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,			\
			 show_fc_rport_##field, NULL)

#define fc_private_rport_rd_attr_cast(field, format_string, sz, cast)	\
	fc_private_rport_show_function(field, format_string, sz, (cast)) \
static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,			\
			  show_fc_rport_##field, NULL)


#define fc_private_rport_rd_enum_attr(title, maxlen)			\
static ssize_t								\
show_fc_rport_##title (struct class_device *cdev, char *buf)		\
{									\
	struct fc_rport *rport = transport_class_to_rport(cdev);	\
	const char *name;						\
	name = get_fc_##title##_name(rport->title);			\
	if (!name)							\
		return -EINVAL;						\
	return snprintf(buf, maxlen, "%s\n", name);			\
}									\
static FC_CLASS_DEVICE_ATTR(rport, title, S_IRUGO,			\
			show_fc_rport_##title, NULL)


#define SETUP_RPORT_ATTRIBUTE_RD(field)					\
	i->private_rport_attrs[count] = class_device_attr_rport_##field; \
	i->private_rport_attrs[count].attr.mode = S_IRUGO;		\
	i->private_rport_attrs[count].store = NULL;			\
	i->rport_attrs[count] = &i->private_rport_attrs[count];		\
	if (i->f->show_rport_##field)					\
		count++

#define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field)				\
	i->private_rport_attrs[count] = class_device_attr_rport_##field; \
	i->private_rport_attrs[count].attr.mode = S_IRUGO;		\
	i->private_rport_attrs[count].store = NULL;			\
	i->rport_attrs[count] = &i->private_rport_attrs[count];		\
	count++

#define SETUP_RPORT_ATTRIBUTE_RW(field)					\
	i->private_rport_attrs[count] = class_device_attr_rport_##field; \
	if (!i->f->set_rport_##field) {					\
		i->private_rport_attrs[count].attr.mode = S_IRUGO;	\
		i->private_rport_attrs[count].store = NULL;		\
	}								\
	i->rport_attrs[count] = &i->private_rport_attrs[count];		\
	if (i->f->show_rport_##field)					\
		count++

#define SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(field)				\
{									\
	i->private_rport_attrs[count] = class_device_attr_rport_##field; \
	i->rport_attrs[count] = &i->private_rport_attrs[count];		\
	count++;							\
}


/* The FC Transport Remote Port Attributes: */

/* Fixed Remote Port Attributes */

fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);

static ssize_t
show_fc_rport_supported_classes (struct class_device *cdev, char *buf)
{
	struct fc_rport *rport = transport_class_to_rport(cdev);
	if (rport->supported_classes == FC_COS_UNSPECIFIED)
		return snprintf(buf, 20, "unspecified\n");
	return get_fc_cos_names(rport->supported_classes, buf);
}
static FC_CLASS_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
		show_fc_rport_supported_classes, NULL);

/* Dynamic Remote Port Attributes */

/*
 * dev_loss_tmo attribute
 */
fc_rport_show_function(dev_loss_tmo, "%d\n", 20, )
static ssize_t
store_fc_rport_dev_loss_tmo(struct class_device *cdev, const char *buf,
			   size_t count)
{
	int val;
	struct fc_rport *rport = transport_class_to_rport(cdev);
	struct Scsi_Host *shost = rport_to_shost(rport);
	struct fc_internal *i = to_fc_internal(shost->transportt);
	char *cp;
	if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
	    (rport->port_state == FC_PORTSTATE_DELETED) ||
	    (rport->port_state == FC_PORTSTATE_NOTPRESENT))
		return -EBUSY;
	val = simple_strtoul(buf, &cp, 0);
	if ((*cp && (*cp != '\n')) ||
	    (val < 0) || (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
		return -EINVAL;
	i->f->set_rport_dev_loss_tmo(rport, val);
	return count;
}
static FC_CLASS_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
		show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo);


/* Private Remote Port Attributes */

fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);

static ssize_t
show_fc_rport_roles (struct class_device *cdev, char *buf)
{
	struct fc_rport *rport = transport_class_to_rport(cdev);

	/* identify any roles that are port_id specific */
	if ((rport->port_id != -1) &&
	    (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
					FC_WELLKNOWN_PORTID_MASK) {
		switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
		case FC_FPORT_PORTID:
			return snprintf(buf, 30, "Fabric Port\n");
		case FC_FABCTLR_PORTID:
			return snprintf(buf, 30, "Fabric Controller\n");
		case FC_DIRSRVR_PORTID:
			return snprintf(buf, 30, "Directory Server\n");
		case FC_TIMESRVR_PORTID:
			return snprintf(buf, 30, "Time Server\n");
		case FC_MGMTSRVR_PORTID:
			return snprintf(buf, 30, "Management Server\n");
		default:
			return snprintf(buf, 30, "Unknown Fabric Entity\n");
		}
	} else {
		if (rport->roles == FC_RPORT_ROLE_UNKNOWN)
			return snprintf(buf, 20, "unknown\n");
		return get_fc_remote_port_roles_names(rport->roles, buf);
	}
}
static FC_CLASS_DEVICE_ATTR(rport, roles, S_IRUGO,
		show_fc_rport_roles, NULL);

fc_private_rport_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);

/*
 * fast_io_fail_tmo attribute
 */
static ssize_t
show_fc_rport_fast_io_fail_tmo (struct class_device *cdev, char *buf)
{
	struct fc_rport *rport = transport_class_to_rport(cdev);

	if (rport->fast_io_fail_tmo == -1)
		return snprintf(buf, 5, "off\n");
	return snprintf(buf, 20, "%d\n", rport->fast_io_fail_tmo);
}

static ssize_t
store_fc_rport_fast_io_fail_tmo(struct class_device *cdev, const char *buf,
			   size_t count)
{
	int val;
	char *cp;
	struct fc_rport *rport = transport_class_to_rport(cdev);

	if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
	    (rport->port_state == FC_PORTSTATE_DELETED) ||
	    (rport->port_state == FC_PORTSTATE_NOTPRESENT))
		return -EBUSY;
	if (strncmp(buf, "off", 3) == 0)
		rport->fast_io_fail_tmo = -1;
	else {
		val = simple_strtoul(buf, &cp, 0);
		if ((*cp && (*cp != '\n')) ||
		    (val < 0) || (val >= rport->dev_loss_tmo))
			return -EINVAL;
		rport->fast_io_fail_tmo = val;
	}
	return count;
}
static FC_CLASS_DEVICE_ATTR(rport, fast_io_fail_tmo, S_IRUGO | S_IWUSR,
	show_fc_rport_fast_io_fail_tmo, store_fc_rport_fast_io_fail_tmo);


/*
 * FC SCSI Target Attribute Management
 */

/*
 * Note: in the target show function we recognize when the remote
 *  port is in the heirarchy and do not allow the driver to get
 *  involved in sysfs functions. The driver only gets involved if
 *  it's the "old" style that doesn't use rports.
 */
#define fc_starget_show_function(field, format_string, sz, cast)	\
static ssize_t								\
show_fc_starget_##field (struct class_device *cdev, char *buf)		\
{									\
	struct scsi_target *starget = transport_class_to_starget(cdev);	\
	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);	\
	struct fc_internal *i = to_fc_internal(shost->transportt);	\
	struct fc_rport *rport = starget_to_rport(starget);		\
	if (rport)							\
		fc_starget_##field(starget) = rport->field;		\
	else if (i->f->get_starget_##field)				\
		i->f->get_starget_##field(starget);			\
	return snprintf(buf, sz, format_string, 			\
		cast fc_starget_##field(starget)); 			\
}

#define fc_starget_rd_attr(field, format_string, sz)			\
	fc_starget_show_function(field, format_string, sz, )		\
static FC_CLASS_DEVICE_ATTR(starget, field, S_IRUGO,			\
			 show_fc_starget_##field, NULL)

#define fc_starget_rd_attr_cast(field, format_string, sz, cast)		\
	fc_starget_show_function(field, format_string, sz, (cast))	\
static FC_CLASS_DEVICE_ATTR(starget, field, S_IRUGO,			\
			  show_fc_starget_##field, NULL)

#define SETUP_STARGET_ATTRIBUTE_RD(field)				\
	i->private_starget_attrs[count] = class_device_attr_starget_##field; \
	i->private_starget_attrs[count].attr.mode = S_IRUGO;		\
	i->private_starget_attrs[count].store = NULL;			\
	i->starget_attrs[count] = &i->private_starget_attrs[count];	\
	if (i->f->show_starget_##field)					\
		count++

#define SETUP_STARGET_ATTRIBUTE_RW(field)				\
	i->private_starget_attrs[count] = class_device_attr_starget_##field; \
	if (!i->f->set_starget_##field) {				\
		i->private_starget_attrs[count].attr.mode = S_IRUGO;	\
		i->private_starget_attrs[count].store = NULL;		\
	}								\
	i->starget_attrs[count] = &i->private_starget_attrs[count];	\
	if (i->f->show_starget_##field)					\
		count++

/* The FC Transport SCSI Target Attributes: */
fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
fc_starget_rd_attr(port_id, "0x%06x\n", 20);


/*
 * Host Attribute Management
 */

#define fc_host_show_function(field, format_string, sz, cast)		\
static ssize_t								\
show_fc_host_##field (struct class_device *cdev, char *buf)		\
{									\
	struct Scsi_Host *shost = transport_class_to_shost(cdev);	\
	struct fc_internal *i = to_fc_internal(shost->transportt);	\
	if (i->f->get_host_##field)					\
		i->f->get_host_##field(shost);				\
	return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
}

#define fc_host_store_function(field)					\
static ssize_t								\
store_fc_host_##field(struct class_device *cdev, const char *buf,	\
			   size_t count)				\
{									\
	int val;							\
	struct Scsi_Host *shost = transport_class_to_shost(cdev);	\
	struct fc_internal *i = to_fc_internal(shost->transportt);	\
	char *cp;							\
									\
	val = simple_strtoul(buf, &cp, 0);				\
	if (*cp && (*cp != '\n'))					\
		return -EINVAL;						\
	i->f->set_host_##field(shost, val);				\
	return count;							\
}

#define fc_host_store_str_function(field, slen)				\
static ssize_t								\
store_fc_host_##field(struct class_device *cdev, const char *buf,	\
			   size_t count)				\
{									\
	struct Scsi_Host *shost = transport_class_to_shost(cdev);	\
	struct fc_internal *i = to_fc_internal(shost->transportt);	\
	unsigned int cnt=count;						\
									\
	/* count may include a LF at end of string */			\
	if (buf[cnt-1] == '\n')						\
		cnt--;							\
	if (cnt > ((slen) - 1))						\
		return -EINVAL;						\
	memcpy(fc_host_##field(shost), buf, cnt);			\
	i->f->set_host_##field(shost);					\
	return count;							\
}

#define fc_host_rd_attr(field, format_string, sz)			\
	fc_host_show_function(field, format_string, sz, )		\
static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,			\
			 show_fc_host_##field, NULL)

#define fc_host_rd_attr_cast(field, format_string, sz, cast)		\
	fc_host_show_function(field, format_string, sz, (cast))		\
static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,			\
			  show_fc_host_##field, NULL)

#define fc_host_rw_attr(field, format_string, sz)			\
	fc_host_show_function(field, format_string, sz, )		\
	fc_host_store_function(field)					\
static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR,		\
			show_fc_host_##field,				\
			store_fc_host_##field)

#define fc_host_rd_enum_attr(title, maxlen)				\
static ssize_t								\
show_fc_host_##title (struct class_device *cdev, char *buf)		\
{									\
	struct Scsi_Host *shost = transport_class_to_shost(cdev);	\
	struct fc_internal *i = to_fc_internal(shost->transportt);	\
	const char *name;						\
	if (i->f->get_host_##title)					\
		i->f->get_host_##title(shost);				\
	name = get_fc_##title##_name(fc_host_##title(shost));		\
	if (!name)							\
		return -EINVAL;						\
	return snprintf(buf, maxlen, "%s\n", name);			\
}									\
static FC_CLASS_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)

#define SETUP_HOST_ATTRIBUTE_RD(field)					\
	i->private_host_attrs[count] = class_device_attr_host_##field;	\
	i->private_host_attrs[count].attr.mode = S_IRUGO;		\
	i->private_host_attrs[count].store = NULL;			\
	i->host_attrs[count] = &i->private_host_attrs[count];		\
	if (i->f->show_host_##field)					\
		count++

#define SETUP_HOST_ATTRIBUTE_RW(field)					\
	i->private_host_attrs[count] = class_device_attr_host_##field;	\
	if (!i->f->set_host_##field) {					\
		i->private_host_attrs[count].attr.mode = S_IRUGO;	\
		i->private_host_attrs[count].store = NULL;		\
	}								\
	i->host_attrs[count] = &i->private_host_attrs[count];		\
	if (i->f->show_host_##field)					\
		count++


#define fc_private_host_show_function(field, format_string, sz, cast)	\
static ssize_t								\
show_fc_host_##field (struct class_device *cdev, char *buf)		\
{									\
	struct Scsi_Host *shost = transport_class_to_shost(cdev);	\
	return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
}

#define fc_private_host_rd_attr(field, format_string, sz)		\
	fc_private_host_show_function(field, format_string, sz, )	\
static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,			\
			 show_fc_host_##field, NULL)

#define fc_private_host_rd_attr_cast(field, format_string, sz, cast)	\
	fc_private_host_show_function(field, format_string, sz, (cast)) \
static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,			\
			  show_fc_host_##field, NULL)

#define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field)			\
	i->private_host_attrs[count] = class_device_attr_host_##field;	\
	i->private_host_attrs[count].attr.mode = S_IRUGO;		\
	i->private_host_attrs[count].store = NULL;			\
	i->host_attrs[count] = &i->private_host_attrs[count];		\
	count++

#define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field)			\
{									\
	i->private_host_attrs[count] = class_device_attr_host_##field;	\
	i->host_attrs[count] = &i->private_host_attrs[count];		\
	count++;							\
}


/* Fixed Host Attributes */

static ssize_t
show_fc_host_supported_classes (struct class_device *cdev, char *buf)
{
	struct Scsi_Host *shost = transport_class_to_shost(cdev);

	if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
		return snprintf(buf, 20, "unspecified\n");

	return get_fc_cos_names(fc_host_supported_classes(shost), buf);
}
static FC_CLASS_DEVICE_ATTR(host, supported_classes, S_IRUGO,
		show_fc_host_supported_classes, NULL);

static ssize_t
show_fc_host_supported_fc4s (struct class_device *cdev, char *buf)
{
	struct Scsi_Host *shost = transport_class_to_shost(cdev);
	return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
}
static FC_CLASS_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
		show_fc_host_supported_fc4s, NULL);

static ssize_t
show_fc_host_supported_speeds (struct class_device *cdev, char *buf)
{
	struct Scsi_Host *shost = transport_class_to_shost(cdev);

	if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
		return snprintf(buf, 20, "unknown\n");

	return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
}
static FC_CLASS_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
		show_fc_host_supported_speeds, NULL);


fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
			     unsigned long long);
fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));


/* Dynamic Host Attributes */

static ssize_t
show_fc_host_active_fc4s (struct class_device *cdev, char *buf)
{
	struct Scsi_Host *shost = transport_class_to_shost(cdev);
	struct fc_internal *i = to_fc_internal(shost->transportt);

	if (i->f->get_host_active_fc4s)
		i->f->get_host_active_fc4s(shost);

	return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
}
static FC_CLASS_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
		show_fc_host_active_fc4s, NULL);

static ssize_t
show_fc_host_speed (struct class_device *cdev, char *buf)
{
	struct Scsi_Host *shost = transport_class_to_shost(cdev);
	struct fc_internal *i = to_fc_internal(shost->transportt);

	if (i->f->get_host_speed)
		i->f->get_host_speed(shost);

	if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
		return snprintf(buf, 20, "unknown\n");

	return get_fc_port_speed_names(fc_host_speed(shost), buf);
}
static FC_CLASS_DEVICE_ATTR(host, speed, S_IRUGO,
		show_fc_host_speed, NULL);


fc_host_rd_attr(port_id, "0x%06x\n", 20);
fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
fc_host_rd_attr(symbolic_name, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);

fc_private_host_show_function(system_hostname, "%s\n",
		FC_SYMBOLIC_NAME_SIZE + 1, )
fc_host_store_str_function(system_hostname, FC_SYMBOLIC_NAME_SIZE)
static FC_CLASS_DEVICE_ATTR(host, system_hostname, S_IRUGO | S_IWUSR,
		show_fc_host_system_hostname, store_fc_host_system_hostname);


/* Private Host Attributes */

static ssize_t
show_fc_private_host_tgtid_bind_type(struct class_device *cdev, char *buf)
{
	struct Scsi_Host *shost = transport_class_to_shost(cdev);
	const char *name;

	name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
	if (!name)
		return -EINVAL;
	return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
}

#define get_list_head_entry(pos, head, member) 		\
	pos = list_entry((head)->next, typeof(*pos), member)

static ssize_t
store_fc_private_host_tgtid_bind_type(struct class_device *cdev,
	const char *buf, size_t count)
{
	struct Scsi_Host *shost = transport_class_to_shost(cdev);
	struct fc_rport *rport;
 	enum fc_tgtid_binding_type val;
	unsigned long flags;

	if (get_fc_tgtid_bind_type_match(buf, &val))
		return -EINVAL;

	/* if changing bind type, purge all unused consistent bindings */
	if (val != fc_host_tgtid_bind_type(shost)) {
		spin_lock_irqsave(shost->host_lock, flags);
		while (!list_empty(&fc_host_rport_bindings(shost))) {
			get_list_head_entry(rport,
				&fc_host_rport_bindings(shost), peers);
			list_del(&rport->peers);
			rport->port_state = FC_PORTSTATE_DELETED;
			fc_queue_work(shost, &rport->rport_delete_work);
		}
		spin_unlock_irqrestore(shost->host_lock, flags);
	}

	fc_host_tgtid_bind_type(shost) = val;
	return count;
}

static FC_CLASS_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
			show_fc_private_host_tgtid_bind_type,
			store_fc_private_host_tgtid_bind_type);

static ssize_t
store_fc_private_host_issue_lip(struct class_device *cdev,
	const char *buf, size_t count)
{
	struct Scsi_Host *shost = transport_class_to_shost(cdev);
	struct fc_internal *i = to_fc_internal(shost->transportt);
	int ret;

	/* ignore any data value written to the attribute */
	if (i->f->issue_fc_host_lip) {
		ret = i->f->issue_fc_host_lip(shost);
		return ret ? ret: count;
	}

	return -ENOENT;
}

static FC_CLASS_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
			store_fc_private_host_issue_lip);

/*
 * Host Statistics Management
 */

/* Show a given an attribute in the statistics group */
static ssize_t
fc_stat_show(const struct class_device *cdev, char *buf, unsigned long offset)
{
	struct Scsi_Host *shost = transport_class_to_shost(cdev);
	struct fc_internal *i = to_fc_internal(shost->transportt);
	struct fc_host_statistics *stats;
	ssize_t ret = -ENOENT;

	if (offset > sizeof(struct fc_host_statistics) ||
	    offset % sizeof(u64) != 0)
		WARN_ON(1);

	if (i->f->get_fc_host_stats) {
		stats = (i->f->get_fc_host_stats)(shost);
		if (stats)
			ret = snprintf(buf, 20, "0x%llx\n",
			      (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
	}
	return ret;
}


/* generate a read-only statistics attribute */
#define fc_host_statistic(name)						\
static ssize_t show_fcstat_##name(struct class_device *cd, char *buf) 	\
{									\
	return fc_stat_show(cd, buf, 					\
			    offsetof(struct fc_host_statistics, name));	\
}									\
static FC_CLASS_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)

fc_host_statistic(seconds_since_last_reset);
fc_host_statistic(tx_frames);
fc_host_statistic(tx_words);
fc_host_statistic(rx_frames);
fc_host_statistic(rx_words);
fc_host_statistic(lip_count);
fc_host_statistic(nos_count);
fc_host_statistic(error_frames);
fc_host_statistic(dumped_frames);
fc_host_statistic(link_failure_count);
fc_host_statistic(loss_of_sync_count);
fc_host_statistic(loss_of_signal_count);
fc_host_statistic(prim_seq_protocol_err_count);
fc_host_statistic(invalid_tx_word_count);
fc_host_statistic(invalid_crc_count);
fc_host_statistic(fcp_input_requests);
fc_host_statistic(fcp_output_requests);
fc_host_statistic(fcp_control_requests);
fc_host_statistic(fcp_input_megabytes);
fc_host_statistic(fcp_output_megabytes);

static ssize_t
fc_reset_statistics(struct class_device *cdev, const char *buf,
			   size_t count)
{
	struct Scsi_Host *shost = transport_class_to_shost(cdev);
	struct fc_internal *i = to_fc_internal(shost->transportt);

	/* ignore any data value written to the attribute */
	if (i->f->reset_fc_host_stats) {
		i->f->reset_fc_host_stats(shost);
		return count;
	}

	return -ENOENT;
}
static FC_CLASS_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
				fc_reset_statistics);


static struct attribute *fc_statistics_attrs[] = {
	&class_device_attr_host_seconds_since_last_reset.attr,
	&class_device_attr_host_tx_frames.attr,
	&class_device_attr_host_tx_words.attr,
	&class_device_attr_host_rx_frames.attr,
	&class_device_attr_host_rx_words.attr,
	&class_device_attr_host_lip_count.attr,
	&class_device_attr_host_nos_count.attr,
	&class_device_attr_host_error_frames.attr,
	&class_device_attr_host_dumped_frames.attr,
	&class_device_attr_host_link_failure_count.attr,
	&class_device_attr_host_loss_of_sync_count.attr,
	&class_device_attr_host_loss_of_signal_count.attr,
	&class_device_attr_host_prim_seq_protocol_err_count.attr,
	&class_device_attr_host_invalid_tx_word_count.attr,
	&class_device_attr_host_invalid_crc_count.attr,
	&class_device_attr_host_fcp_input_requests.attr,
	&class_device_attr_host_fcp_output_requests.attr,
	&class_device_attr_host_fcp_control_requests.attr,
	&class_device_attr_host_fcp_input_megabytes.attr,
	&class_device_attr_host_fcp_output_megabytes.attr,
	&class_device_attr_host_reset_statistics.attr,
	NULL
};

static struct attribute_group fc_statistics_group = {
	.name = "statistics",
	.attrs = fc_statistics_attrs,
};

static int fc_host_match(struct attribute_container *cont,
			  struct device *dev)
{
	struct Scsi_Host *shost;
	struct fc_internal *i;

	if (!scsi_is_host_device(dev))
		return 0;

	shost = dev_to_shost(dev);
	if (!shost->transportt  || shost->transportt->host_attrs.ac.class
	    != &fc_host_class.class)
		return 0;

	i = to_fc_internal(shost->transportt);

	return &i->t.host_attrs.ac == cont;
}

static int fc_target_match(struct attribute_container *cont,
			    struct device *dev)
{
	struct Scsi_Host *shost;
	struct fc_internal *i;

	if (!scsi_is_target_device(dev))
		return 0;

	shost = dev_to_shost(dev->parent);
	if (!shost->transportt  || shost->transportt->host_attrs.ac.class
	    != &fc_host_class.class)
		return 0;

	i = to_fc_internal(shost->transportt);

	return &i->t.target_attrs.ac == cont;
}

static void fc_rport_dev_release(struct device *dev)
{
	struct fc_rport *rport = dev_to_rport(dev);
	put_device(dev->parent);
	kfree(rport);
}

int scsi_is_fc_rport(const struct device *dev)
{
	return dev->release == fc_rport_dev_release;
}
EXPORT_SYMBOL(scsi_is_fc_rport);

static int fc_rport_match(struct attribute_container *cont,
			    struct device *dev)
{
	struct Scsi_Host *shost;
	struct fc_internal *i;

	if (!scsi_is_fc_rport(dev))
		return 0;

	shost = dev_to_shost(dev->parent);
	if (!shost->transportt  || shost->transportt->host_attrs.ac.class
	    != &fc_host_class.class)
		return 0;

	i = to_fc_internal(shost->transportt);

	return &i->rport_attr_cont.ac == cont;
}


/**
 * fc_timed_out - FC Transport I/O timeout intercept handler
 *
 * @scmd:	The SCSI command which timed out
 *
 * This routine protects against error handlers getting invoked while a
 * rport is in a blocked state, typically due to a temporarily loss of
 * connectivity. If the error handlers are allowed to proceed, requests
 * to abort i/o, reset the target, etc will likely fail as there is no way
 * to communicate with the device to perform the requested function. These
 * failures may result in the midlayer taking the device offline, requiring
 * manual intervention to restore operation.
 *
 * This routine, called whenever an i/o times out, validates the state of
 * the underlying rport. If the rport is blocked, it returns
 * EH_RESET_TIMER, which will continue to reschedule the timeout.
 * Eventually, either the device will return, or devloss_tmo will fire,
 * and when the timeout then fires, it will be handled normally.
 * If the rport is not blocked, normal error handling continues.
 *
 * Notes:
 *	This routine assumes no locks are held on entry.
 **/
static enum scsi_eh_timer_return
fc_timed_out(struct scsi_cmnd *scmd)
{
	struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));

	if (rport->port_state == FC_PORTSTATE_BLOCKED)
		return EH_RESET_TIMER;

	return EH_NOT_HANDLED;
}

/*
 * Must be called with shost->host_lock held
 */
static int fc_user_scan(struct Scsi_Host *shost, uint channel,
		uint id, uint lun)
{
	struct fc_rport *rport;

	list_for_each_entry(rport, &fc_host_rports(shost), peers) {
		if (rport->scsi_target_id == -1)
			continue;

		if ((channel == SCAN_WILD_CARD || channel == rport->channel) &&
		    (id == SCAN_WILD_CARD || id == rport->scsi_target_id)) {
			scsi_scan_target(&rport->dev, rport->channel,
					 rport->scsi_target_id, lun, 1);
		}
	}

	return 0;
}

struct scsi_transport_template *
fc_attach_transport(struct fc_function_template *ft)
{
	int count;
	struct fc_internal *i = kzalloc(sizeof(struct fc_internal),
					GFP_KERNEL);

	if (unlikely(!i))
		return NULL;

	i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
	i->t.target_attrs.ac.class = &fc_transport_class.class;
	i->t.target_attrs.ac.match = fc_target_match;
	i->t.target_size = sizeof(struct fc_starget_attrs);
	transport_container_register(&i->t.target_attrs);

	i->t.host_attrs.ac.attrs = &i->host_attrs[0];
	i->t.host_attrs.ac.class = &fc_host_class.class;
	i->t.host_attrs.ac.match = fc_host_match;
	i->t.host_size = sizeof(struct fc_host_attrs);
	if (ft->get_fc_host_stats)
		i->t.host_attrs.statistics = &fc_statistics_group;
	transport_container_register(&i->t.host_attrs);

	i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
	i->rport_attr_cont.ac.class = &fc_rport_class.class;
	i->rport_attr_cont.ac.match = fc_rport_match;
	transport_container_register(&i->rport_attr_cont);

	i->f = ft;

	/* Transport uses the shost workq for scsi scanning */
	i->t.create_work_queue = 1;

	i->t.eh_timed_out = fc_timed_out;

	i->t.user_scan = fc_user_scan;
	
	/*
	 * Setup SCSI Target Attributes.
	 */
	count = 0;
	SETUP_STARGET_ATTRIBUTE_RD(node_name);
	SETUP_STARGET_ATTRIBUTE_RD(port_name);
	SETUP_STARGET_ATTRIBUTE_RD(port_id);

	BUG_ON(count > FC_STARGET_NUM_ATTRS);

	i->starget_attrs[count] = NULL;


	/*
	 * Setup SCSI Host Attributes.
	 */
	count=0;
	SETUP_HOST_ATTRIBUTE_RD(node_name);
	SETUP_HOST_ATTRIBUTE_RD(port_name);
	SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
	SETUP_HOST_ATTRIBUTE_RD(supported_classes);
	SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
	SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
	SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
	SETUP_HOST_ATTRIBUTE_RD(serial_number);

	SETUP_HOST_ATTRIBUTE_RD(port_id);
	SETUP_HOST_ATTRIBUTE_RD(port_type);
	SETUP_HOST_ATTRIBUTE_RD(port_state);
	SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
	SETUP_HOST_ATTRIBUTE_RD(speed);
	SETUP_HOST_ATTRIBUTE_RD(fabric_name);
	SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
	SETUP_HOST_ATTRIBUTE_RW(system_hostname);

	/* Transport-managed attributes */
	SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
	if (ft->issue_fc_host_lip)
		SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);

	BUG_ON(count > FC_HOST_NUM_ATTRS);

	i->host_attrs[count] = NULL;

	/*
	 * Setup Remote Port Attributes.
	 */
	count=0;
	SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
	SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
	SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
	SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
	SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
	SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
	SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
	SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
	SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
	if (ft->terminate_rport_io)
		SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);

	BUG_ON(count > FC_RPORT_NUM_ATTRS);

	i->rport_attrs[count] = NULL;

	return &i->t;
}
EXPORT_SYMBOL(fc_attach_transport);

void fc_release_transport(struct scsi_transport_template *t)
{
	struct fc_internal *i = to_fc_internal(t);

	transport_container_unregister(&i->t.target_attrs);
	transport_container_unregister(&i->t.host_attrs);
	transport_container_unregister(&i->rport_attr_cont);

	kfree(i);
}
EXPORT_SYMBOL(fc_release_transport);

/**
 * fc_queue_work - Queue work to the fc_host workqueue.
 * @shost:	Pointer to Scsi_Host bound to fc_host.
 * @work:	Work to queue for execution.
 *
 * Return value:
 * 	1 - work queued for execution
 *	0 - work is already queued
 *	-EINVAL - work queue doesn't exist
 **/
static int
fc_queue_work(struct Scsi_Host *shost, struct work_struct *work)
{
	if (unlikely(!fc_host_work_q(shost))) {
		printk(KERN_ERR
			"ERROR: FC host '%s' attempted to queue work, "
			"when no workqueue created.\n", shost->hostt->name);
		dump_stack();

		return -EINVAL;
	}

	return queue_work(fc_host_work_q(shost), work);
}

/**
 * fc_flush_work - Flush a fc_host's workqueue.
 * @shost:	Pointer to Scsi_Host bound to fc_host.
 **/
static void
fc_flush_work(struct Scsi_Host *shost)
{
	if (!fc_host_work_q(shost)) {
		printk(KERN_ERR
			"ERROR: FC host '%s' attempted to flush work, "
			"when no workqueue created.\n", shost->hostt->name);
		dump_stack();
		return;
	}

	flush_workqueue(fc_host_work_q(shost));
}

/**
 * fc_queue_devloss_work - Schedule work for the fc_host devloss workqueue.
 * @shost:	Pointer to Scsi_Host bound to fc_host.
 * @work:	Work to queue for execution.
 * @delay:	jiffies to delay the work queuing
 *
 * Return value:
 * 	1 on success / 0 already queued / < 0 for error
 **/
static int
fc_queue_devloss_work(struct Scsi_Host *shost, struct delayed_work *work,
				unsigned long delay)
{
	if (unlikely(!fc_host_devloss_work_q(shost))) {
		printk(KERN_ERR
			"ERROR: FC host '%s' attempted to queue work, "
			"when no workqueue created.\n", shost->hostt->name);
		dump_stack();

		return -EINVAL;
	}

	return queue_delayed_work(fc_host_devloss_work_q(shost), work, delay);
}

/**
 * fc_flush_devloss - Flush a fc_host's devloss workqueue.
 * @shost:	Pointer to Scsi_Host bound to fc_host.
 **/
static void
fc_flush_devloss(struct Scsi_Host *shost)
{
	if (!fc_host_devloss_work_q(shost)) {
		printk(KERN_ERR
			"ERROR: FC host '%s' attempted to flush work, "
			"when no workqueue created.\n", shost->hostt->name);
		dump_stack();
		return;
	}

	flush_workqueue(fc_host_devloss_work_q(shost));
}


/**
 * fc_remove_host - called to terminate any fc_transport-related elements
 *                  for a scsi host.
 * @rport:	remote port to be unblocked.
 *
 * This routine is expected to be called immediately preceeding the
 * a driver's call to scsi_remove_host().
 *
 * WARNING: A driver utilizing the fc_transport, which fails to call
 *   this routine prior to scsi_remote_host(), will leave dangling
 *   objects in /sys/class/fc_remote_ports. Access to any of these
 *   objects can result in a system crash !!!
 *
 * Notes:
 *	This routine assumes no locks are held on entry.
 **/
void
fc_remove_host(struct Scsi_Host *shost)
{
	struct fc_rport *rport, *next_rport;
	struct workqueue_struct *work_q;
	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);

	/* Remove any remote ports */
	list_for_each_entry_safe(rport, next_rport,
			&fc_host->rports, peers) {
		list_del(&rport->peers);
		rport->port_state = FC_PORTSTATE_DELETED;
		fc_queue_work(shost, &rport->rport_delete_work);
	}

	list_for_each_entry_safe(rport, next_rport,
			&fc_host->rport_bindings, peers) {
		list_del(&rport->peers);
		rport->port_state = FC_PORTSTATE_DELETED;
		fc_queue_work(shost, &rport->rport_delete_work);
	}

	/* flush all scan work items */
	scsi_flush_work(shost);

	/* flush all stgt delete, and rport delete work items, then kill it  */
	if (fc_host->work_q) {
		work_q = fc_host->work_q;
		fc_host->work_q = NULL;
		destroy_workqueue(work_q);
	}

	/* flush all devloss work items, then kill it  */
	if (fc_host->devloss_work_q) {
		work_q = fc_host->devloss_work_q;
		fc_host->devloss_work_q = NULL;
		destroy_workqueue(work_q);
	}
}
EXPORT_SYMBOL(fc_remove_host);


/**
 * fc_starget_delete - called to delete the scsi decendents of an rport
 *                  (target and all sdevs)
 *
 * @work:	remote port to be operated on.
 **/
static void
fc_starget_delete(struct work_struct *work)
{
	struct fc_rport *rport =
		container_of(work, struct fc_rport, stgt_delete_work);
	struct Scsi_Host *shost = rport_to_shost(rport);
	unsigned long flags;
	struct fc_internal *i = to_fc_internal(shost->transportt);

	/*
	 * Involve the LLDD if possible. All io on the rport is to
	 * be terminated, either as part of the dev_loss_tmo callback
	 * processing, or via the terminate_rport_io function.
	 */
	if (i->f->dev_loss_tmo_callbk)
		i->f->dev_loss_tmo_callbk(rport);
	else if (i->f->terminate_rport_io)
		i->f->terminate_rport_io(rport);

	spin_lock_irqsave(shost->host_lock, flags);
	if (rport->flags & FC_RPORT_DEVLOSS_PENDING) {
		spin_unlock_irqrestore(shost->host_lock, flags);
		if (!cancel_delayed_work(&rport->fail_io_work))
			fc_flush_devloss(shost);
		if (!cancel_delayed_work(&rport->dev_loss_work))
			fc_flush_devloss(shost);
		spin_lock_irqsave(shost->host_lock, flags);
		rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
	}
	spin_unlock_irqrestore(shost->host_lock, flags);

	scsi_remove_target(&rport->dev);
}


/**
 * fc_rport_final_delete - finish rport termination and delete it.
 *
 * @work:	remote port to be deleted.
 **/
static void
fc_rport_final_delete(struct work_struct *work)
{
	struct fc_rport *rport =
		container_of(work, struct fc_rport, rport_delete_work);
	struct device *dev = &rport->dev;
	struct Scsi_Host *shost = rport_to_shost(rport);
	struct fc_internal *i = to_fc_internal(shost->transportt);

	/*
	 * if a scan is pending, flush the SCSI Host work_q so that 
	 * that we can reclaim the rport scan work element.
	 */
	if (rport->flags & FC_RPORT_SCAN_PENDING)
		scsi_flush_work(shost);

	/* Delete SCSI target and sdevs */
	if (rport->scsi_target_id != -1)
		fc_starget_delete(&rport->stgt_delete_work);
	else if (i->f->dev_loss_tmo_callbk)
		i->f->dev_loss_tmo_callbk(rport);
	else if (i->f->terminate_rport_io)
		i->f->terminate_rport_io(rport);

	transport_remove_device(dev);
	device_del(dev);
	transport_destroy_device(dev);
	put_device(&shost->shost_gendev);	/* for fc_host->rport list */
	put_device(dev);			/* for self-reference */
}


/**
 * fc_rport_create - allocates and creates a remote FC port.
 * @shost:	scsi host the remote port is connected to.
 * @channel:	Channel on shost port connected to.
 * @ids:	The world wide names, fc address, and FC4 port
 *		roles for the remote port.
 *
 * Allocates and creates the remoter port structure, including the
 * class and sysfs creation.
 *
 * Notes:
 *	This routine assumes no locks are held on entry.
 **/
struct fc_rport *
fc_rport_create(struct Scsi_Host *shost, int channel,
	struct fc_rport_identifiers  *ids)
{
	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
	struct fc_internal *fci = to_fc_internal(shost->transportt);
	struct fc_rport *rport;
	struct device *dev;
	unsigned long flags;
	int error;
	size_t size;

	size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
	rport = kzalloc(size, GFP_KERNEL);
	if (unlikely(!rport)) {
		printk(KERN_ERR "%s: allocation failure\n", __FUNCTION__);
		return NULL;
	}

	rport->maxframe_size = -1;
	rport->supported_classes = FC_COS_UNSPECIFIED;
	rport->dev_loss_tmo = fc_dev_loss_tmo;
	memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
	memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
	rport->port_id = ids->port_id;
	rport->roles = ids->roles;
	rport->port_state = FC_PORTSTATE_ONLINE;
	if (fci->f->dd_fcrport_size)
		rport->dd_data = &rport[1];
	rport->channel = channel;
	rport->fast_io_fail_tmo = -1;

	INIT_DELAYED_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport);
	INIT_DELAYED_WORK(&rport->fail_io_work, fc_timeout_fail_rport_io);
	INIT_WORK(&rport->scan_work, fc_scsi_scan_rport);
	INIT_WORK(&rport->stgt_delete_work, fc_starget_delete);
	INIT_WORK(&rport->rport_delete_work, fc_rport_final_delete);

	spin_lock_irqsave(shost->host_lock, flags);

	rport->number = fc_host->next_rport_number++;
	if (rport->roles & FC_RPORT_ROLE_FCP_TARGET)
		rport->scsi_target_id = fc_host->next_target_id++;
	else
		rport->scsi_target_id = -1;
	list_add_tail(&rport->peers, &fc_host->rports);
	get_device(&shost->shost_gendev);	/* for fc_host->rport list */

	spin_unlock_irqrestore(shost->host_lock, flags);

	dev = &rport->dev;
	device_initialize(dev);			/* takes self reference */
	dev->parent = get_device(&shost->shost_gendev); /* parent reference */
	dev->release = fc_rport_dev_release;
	sprintf(dev->bus_id, "rport-%d:%d-%d",
		shost->host_no, channel, rport->number);
	transport_setup_device(dev);

	error = device_add(dev);
	if (error) {
		printk(KERN_ERR "FC Remote Port device_add failed\n");
		goto delete_rport;
	}
	transport_add_device(dev);
	transport_configure_device(dev);

	if (rport->roles & FC_RPORT_ROLE_FCP_TARGET) {
		/* initiate a scan of the target */
		rport->flags |= FC_RPORT_SCAN_PENDING;
		scsi_queue_work(shost, &rport->scan_work);
	}

	return rport;

delete_rport:
	transport_destroy_device(dev);
	spin_lock_irqsave(shost->host_lock, flags);
	list_del(&rport->peers);
	put_device(&shost->shost_gendev);	/* for fc_host->rport list */
	spin_unlock_irqrestore(shost->host_lock, flags);
	put_device(dev->parent);
	kfree(rport);
	return NULL;
}

/**
 * fc_remote_port_add - notifies the fc transport of the existence
 *		of a remote FC port.
 * @shost:	scsi host the remote port is connected to.
 * @channel:	Channel on shost port connected to.
 * @ids:	The world wide names, fc address, and FC4 port
 *		roles for the remote port.
 *
 * The LLDD calls this routine to notify the transport of the existence
 * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
 * of the port, it's FC address (port_id), and the FC4 roles that are
 * active for the port.
 *
 * For ports that are FCP targets (aka scsi targets), the FC transport
 * maintains consistent target id bindings on behalf of the LLDD.
 * A consistent target id binding is an assignment of a target id to
 * a remote port identifier, which persists while the scsi host is
 * attached. The remote port can disappear, then later reappear, and
 * it's target id assignment remains the same. This allows for shifts
 * in FC addressing (if binding by wwpn or wwnn) with no apparent
 * changes to the scsi subsystem which is based on scsi host number and
 * target id values.  Bindings are only valid during the attachment of
 * the scsi host. If the host detaches, then later re-attaches, target
 * id bindings may change.
 *
 * This routine is responsible for returning a remote port structure.
 * The routine will search the list of remote ports it maintains
 * internally on behalf of consistent target id mappings. If found, the
 * remote port structure will be reused. Otherwise, a new remote port
 * structure will be allocated.
 *
 * Whenever a remote port is allocated, a new fc_remote_port class
 * device is created.
 *
 * Should not be called from interrupt context.
 *
 * Notes:
 *	This routine assumes no locks are held on entry.
 **/
struct fc_rport *
fc_remote_port_add(struct Scsi_Host *shost, int channel,
	struct fc_rport_identifiers  *ids)
{
	struct fc_internal *fci = to_fc_internal(shost->transportt);
	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
	struct fc_rport *rport;
	unsigned long flags;
	int match = 0;

	/* ensure any stgt delete functions are done */
	fc_flush_work(shost);

	/*
	 * Search the list of "active" rports, for an rport that has been
	 * deleted, but we've held off the real delete while the target
	 * is in a "blocked" state.
	 */
	spin_lock_irqsave(shost->host_lock, flags);

	list_for_each_entry(rport, &fc_host->rports, peers) {

		if ((rport->port_state == FC_PORTSTATE_BLOCKED) &&
			(rport->channel == channel)) {

			switch (fc_host->tgtid_bind_type) {
			case FC_TGTID_BIND_BY_WWPN:
			case FC_TGTID_BIND_NONE:
				if (rport->port_name == ids->port_name)
					match = 1;
				break;
			case FC_TGTID_BIND_BY_WWNN:
				if (rport->node_name == ids->node_name)
					match = 1;
				break;
			case FC_TGTID_BIND_BY_ID:
				if (rport->port_id == ids->port_id)
					match = 1;
				break;
			}

			if (match) {
				struct delayed_work *work =
							&rport->dev_loss_work;

				memcpy(&rport->node_name, &ids->node_name,
					sizeof(rport->node_name));
				memcpy(&rport->port_name, &ids->port_name,
					sizeof(rport->port_name));
				rport->port_id = ids->port_id;

				rport->port_state = FC_PORTSTATE_ONLINE;
				rport->roles = ids->roles;

				spin_unlock_irqrestore(shost->host_lock, flags);

				if (fci->f->dd_fcrport_size)
					memset(rport->dd_data, 0,
						fci->f->dd_fcrport_size);

				/*
				 * If we were blocked, we were a target.
				 * If no longer a target, we leave the timer
				 * running in case the port changes roles
				 * prior to the timer expiring. If the timer
				 * fires, the target will be torn down.
				 */
				if (!(ids->roles & FC_RPORT_ROLE_FCP_TARGET))
					return rport;

				/* restart the target */

				/*
				 * Stop the target timers first. Take no action
				 * on the del_timer failure as the state
				 * machine state change will validate the
				 * transaction.
				 */
				if (!cancel_delayed_work(&rport->fail_io_work))
					fc_flush_devloss(shost);
				if (!cancel_delayed_work(work))
					fc_flush_devloss(shost);

				spin_lock_irqsave(shost->host_lock, flags);

				rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;

				/* initiate a scan of the target */
				rport->flags |= FC_RPORT_SCAN_PENDING;
				scsi_queue_work(shost, &rport->scan_work);

				spin_unlock_irqrestore(shost->host_lock, flags);

				scsi_target_unblock(&rport->dev);

				return rport;
			}
		}
	}

	/* Search the bindings array */
	if (fc_host->tgtid_bind_type != FC_TGTID_BIND_NONE) {

		/* search for a matching consistent binding */

		list_for_each_entry(rport, &fc_host->rport_bindings,
					peers) {
			if (rport->channel != channel)
				continue;

			switch (fc_host->tgtid_bind_type) {
			case FC_TGTID_BIND_BY_WWPN:
				if (rport->port_name == ids->port_name)
					match = 1;
				break;
			case FC_TGTID_BIND_BY_WWNN:
				if (rport->node_name == ids->node_name)
					match = 1;
				break;
			case FC_TGTID_BIND_BY_ID:
				if (rport->port_id == ids->port_id)
					match = 1;
				break;
			case FC_TGTID_BIND_NONE: /* to keep compiler happy */
				break;
			}

			if (match) {
				list_move_tail(&rport->peers, &fc_host->rports);
				break;
			}
		}

		if (match) {
			memcpy(&rport->node_name, &ids->node_name,
				sizeof(rport->node_name));
			memcpy(&rport->port_name, &ids->port_name,
				sizeof(rport->port_name));
			rport->port_id = ids->port_id;
			rport->roles = ids->roles;
			rport->port_state = FC_PORTSTATE_ONLINE;

			if (fci->f->dd_fcrport_size)
				memset(rport->dd_data, 0,
						fci->f->dd_fcrport_size);

			if (rport->roles & FC_RPORT_ROLE_FCP_TARGET) {
				/* initiate a scan of the target */
				rport->flags |= FC_RPORT_SCAN_PENDING;
				scsi_queue_work(shost, &rport->scan_work);
				spin_unlock_irqrestore(shost->host_lock, flags);
				scsi_target_unblock(&rport->dev);
			} else
				spin_unlock_irqrestore(shost->host_lock, flags);

			return rport;
		}
	}

	spin_unlock_irqrestore(shost->host_lock, flags);

	/* No consistent binding found - create new remote port entry */
	rport = fc_rport_create(shost, channel, ids);

	return rport;
}
EXPORT_SYMBOL(fc_remote_port_add);


/**
 * fc_remote_port_delete - notifies the fc transport that a remote
 *		port is no longer in existence.
 * @rport:	The remote port that no longer exists
 *
 * The LLDD calls this routine to notify the transport that a remote
 * port is no longer part of the topology. Note: Although a port
 * may no longer be part of the topology, it may persist in the remote
 * ports displayed by the fc_host. We do this under 2 conditions:
 * - If the port was a scsi target, we delay its deletion by "blocking" it.
 *   This allows the port to temporarily disappear, then reappear without
 *   disrupting the SCSI device tree attached to it. During the "blocked"
 *   period the port will still exist.
 * - If the port was a scsi target and disappears for longer than we
 *   expect, we'll delete the port and the tear down the SCSI device tree
 *   attached to it. However, we want to semi-persist the target id assigned
 *   to that port if it eventually does exist. The port structure will
 *   remain (although with minimal information) so that the target id
 *   bindings remails.
 *
 * If the remote port is not an FCP Target, it will be fully torn down
 * and deallocated, including the fc_remote_port class device.
 *
 * If the remote port is an FCP Target, the port will be placed in a
 * temporary blocked state. From the LLDD's perspective, the rport no
 * longer exists. From the SCSI midlayer's perspective, the SCSI target
 * exists, but all sdevs on it are blocked from further I/O. The following
 * is then expected:
 *   If the remote port does not return (signaled by a LLDD call to
 *   fc_remote_port_add()) within the dev_loss_tmo timeout, then the
 *   scsi target is removed - killing all outstanding i/o and removing the
 *   scsi devices attached ot it. The port structure will be marked Not
 *   Present and be partially cleared, leaving only enough information to
 *   recognize the remote port relative to the scsi target id binding if
 *   it later appears.  The port will remain as long as there is a valid
 *   binding (e.g. until the user changes the binding type or unloads the
 *   scsi host with the binding).
 *
 *   If the remote port returns within the dev_loss_tmo value (and matches
 *   according to the target id binding type), the port structure will be
 *   reused. If it is no longer a SCSI target, the target will be torn
 *   down. If it continues to be a SCSI target, then the target will be
 *   unblocked (allowing i/o to be resumed), and a scan will be activated
 *   to ensure that all luns are detected.
 *
 * Called from normal process context only - cannot be called from interrupt.
 *
 * Notes:
 *	This routine assumes no locks are held on entry.
 **/
void
fc_remote_port_delete(struct fc_rport  *rport)
{
	struct Scsi_Host *shost = rport_to_shost(rport);
	struct fc_internal *i = to_fc_internal(shost->transportt);
	int timeout = rport->dev_loss_tmo;
	unsigned long flags;

	/*
	 * No need to flush the fc_host work_q's, as all adds are synchronous.
	 *
	 * We do need to reclaim the rport scan work element, so eventually
	 * (in fc_rport_final_delete()) we'll flush the scsi host work_q if
	 * there's still a scan pending.
	 */

	spin_lock_irqsave(shost->host_lock, flags);

	/* If no scsi target id mapping, delete it */
	if (rport->scsi_target_id == -1) {
		list_del(&rport->peers);
		rport->port_state = FC_PORTSTATE_DELETED;
		fc_queue_work(shost, &rport->rport_delete_work);
		spin_unlock_irqrestore(shost->host_lock, flags);
		return;
	}

	rport->port_state = FC_PORTSTATE_BLOCKED;

	rport->flags |= FC_RPORT_DEVLOSS_PENDING;

	spin_unlock_irqrestore(shost->host_lock, flags);

	scsi_target_block(&rport->dev);

	/* see if we need to kill io faster than waiting for device loss */
	if ((rport->fast_io_fail_tmo != -1) &&
	    (rport->fast_io_fail_tmo < timeout) && (i->f->terminate_rport_io))
		fc_queue_devloss_work(shost, &rport->fail_io_work,
					rport->fast_io_fail_tmo * HZ);

	/* cap the length the devices can be blocked until they are deleted */
	fc_queue_devloss_work(shost, &rport->dev_loss_work, timeout * HZ);
}
EXPORT_SYMBOL(fc_remote_port_delete);

/**
 * fc_remote_port_rolechg - notifies the fc transport that the roles
 *		on a remote may have changed.
 * @rport:	The remote port that changed.
 *
 * The LLDD calls this routine to notify the transport that the roles
 * on a remote port may have changed. The largest effect of this is
 * if a port now becomes a FCP Target, it must be allocated a
 * scsi target id.  If the port is no longer a FCP target, any
 * scsi target id value assigned to it will persist in case the
 * role changes back to include FCP Target. No changes in the scsi
 * midlayer will be invoked if the role changes (in the expectation
 * that the role will be resumed. If it doesn't normal error processing
 * will take place).
 *
 * Should not be called from interrupt context.
 *
 * Notes:
 *	This routine assumes no locks are held on entry.
 **/
void
fc_remote_port_rolechg(struct fc_rport  *rport, u32 roles)
{
	struct Scsi_Host *shost = rport_to_shost(rport);
	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
	unsigned long flags;
	int create = 0;

	spin_lock_irqsave(shost->host_lock, flags);
	if (roles & FC_RPORT_ROLE_FCP_TARGET) {
		if (rport->scsi_target_id == -1) {
			rport->scsi_target_id = fc_host->next_target_id++;
			create = 1;
		} else if (!(rport->roles & FC_RPORT_ROLE_FCP_TARGET))
			create = 1;
	}

	rport->roles = roles;

	spin_unlock_irqrestore(shost->host_lock, flags);

	if (create) {
		/*
		 * There may have been a delete timer running on the
		 * port. Ensure that it is cancelled as we now know
		 * the port is an FCP Target.
		 * Note: we know the rport is exists and in an online
		 *  state as the LLDD would not have had an rport
		 *  reference to pass us.
		 *
		 * Take no action on the del_timer failure as the state
		 * machine state change will validate the
		 * transaction.
		 */
		if (!cancel_delayed_work(&rport->fail_io_work))
			fc_flush_devloss(shost);
		if (!cancel_delayed_work(&rport->dev_loss_work))
			fc_flush_devloss(shost);

		spin_lock_irqsave(shost->host_lock, flags);
		rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
		spin_unlock_irqrestore(shost->host_lock, flags);

		/* ensure any stgt delete functions are done */
		fc_flush_work(shost);

		/* initiate a scan of the target */
		spin_lock_irqsave(shost->host_lock, flags);
		rport->flags |= FC_RPORT_SCAN_PENDING;
		scsi_queue_work(shost, &rport->scan_work);
		spin_unlock_irqrestore(shost->host_lock, flags);
		scsi_target_unblock(&rport->dev);
	}
}
EXPORT_SYMBOL(fc_remote_port_rolechg);

/**
 * fc_timeout_deleted_rport - Timeout handler for a deleted remote port that
 *                       was a SCSI target (thus was blocked), and failed
 *                       to return in the alloted time.
 * 
 * @work:	rport target that failed to reappear in the alloted time.
 **/
static void
fc_timeout_deleted_rport(struct work_struct *work)
{
	struct fc_rport *rport =
		container_of(work, struct fc_rport, dev_loss_work.work);
	struct Scsi_Host *shost = rport_to_shost(rport);
	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
	unsigned long flags;

	spin_lock_irqsave(shost->host_lock, flags);

	rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;

	/*
	 * If the port is ONLINE, then it came back. Validate it's still an
	 * FCP target. If not, tear down the scsi_target on it.
	 */
	if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
	    !(rport->roles & FC_RPORT_ROLE_FCP_TARGET)) {
		dev_printk(KERN_ERR, &rport->dev,
			"blocked FC remote port time out: no longer"
			" a FCP target, removing starget\n");
		spin_unlock_irqrestore(shost->host_lock, flags);
		scsi_target_unblock(&rport->dev);
		fc_queue_work(shost, &rport->stgt_delete_work);
		return;
	}

	if (rport->port_state != FC_PORTSTATE_BLOCKED) {
		spin_unlock_irqrestore(shost->host_lock, flags);
		dev_printk(KERN_ERR, &rport->dev,
			"blocked FC remote port time out: leaving target alone\n");
		return;
	}

	if (fc_host->tgtid_bind_type == FC_TGTID_BIND_NONE) {
		list_del(&rport->peers);
		rport->port_state = FC_PORTSTATE_DELETED;
		dev_printk(KERN_ERR, &rport->dev,
			"blocked FC remote port time out: removing target\n");
		fc_queue_work(shost, &rport->rport_delete_work);
		spin_unlock_irqrestore(shost->host_lock, flags);
		return;
	}

	dev_printk(KERN_ERR, &rport->dev,
		"blocked FC remote port time out: removing target and "
		"saving binding\n");

	list_move_tail(&rport->peers, &fc_host->rport_bindings);

	/*
	 * Note: We do not remove or clear the hostdata area. This allows
	 *   host-specific target data to persist along with the
	 *   scsi_target_id. It's up to the host to manage it's hostdata area.
	 */

	/*
	 * Reinitialize port attributes that may change if the port comes back.
	 */
	rport->maxframe_size = -1;
	rport->supported_classes = FC_COS_UNSPECIFIED;
	rport->roles = FC_RPORT_ROLE_UNKNOWN;
	rport->port_state = FC_PORTSTATE_NOTPRESENT;

	/* remove the identifiers that aren't used in the consisting binding */
	switch (fc_host->tgtid_bind_type) {
	case FC_TGTID_BIND_BY_WWPN:
		rport->node_name = -1;
		rport->port_id = -1;
		break;
	case FC_TGTID_BIND_BY_WWNN:
		rport->port_name = -1;
		rport->port_id = -1;
		break;
	case FC_TGTID_BIND_BY_ID:
		rport->node_name = -1;
		rport->port_name = -1;
		break;
	case FC_TGTID_BIND_NONE:	/* to keep compiler happy */
		break;
	}

	/*
	 * As this only occurs if the remote port (scsi target)
	 * went away and didn't come back - we'll remove
	 * all attached scsi devices.
	 */
	spin_unlock_irqrestore(shost->host_lock, flags);

	scsi_target_unblock(&rport->dev);
	fc_queue_work(shost, &rport->stgt_delete_work);
}

/**
 * fc_timeout_fail_rport_io - Timeout handler for a fast io failing on a
 *                       disconnected SCSI target.
 *
 * @work:	rport to terminate io on.
 *
 * Notes: Only requests the failure of the io, not that all are flushed
 *    prior to returning.
 **/
static void
fc_timeout_fail_rport_io(struct work_struct *work)
{
	struct fc_rport *rport =
		container_of(work, struct fc_rport, fail_io_work.work);
	struct Scsi_Host *shost = rport_to_shost(rport);
	struct fc_internal *i = to_fc_internal(shost->transportt);

	if (rport->port_state != FC_PORTSTATE_BLOCKED)
		return;

	i->f->terminate_rport_io(rport);
}

/**
 * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
 *
 * @work:	remote port to be scanned.
 **/
static void
fc_scsi_scan_rport(struct work_struct *work)
{
	struct fc_rport *rport =
		container_of(work, struct fc_rport, scan_work);
	struct Scsi_Host *shost = rport_to_shost(rport);
	unsigned long flags;

	if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
	    (rport->roles & FC_RPORT_ROLE_FCP_TARGET)) {
		scsi_scan_target(&rport->dev, rport->channel,
			rport->scsi_target_id, SCAN_WILD_CARD, 1);
	}

	spin_lock_irqsave(shost->host_lock, flags);
	rport->flags &= ~FC_RPORT_SCAN_PENDING;
	spin_unlock_irqrestore(shost->host_lock, flags);
}


MODULE_AUTHOR("Martin Hicks");
MODULE_DESCRIPTION("FC Transport Attributes");
MODULE_LICENSE("GPL");

module_init(fc_transport_init);
module_exit(fc_transport_exit);