summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/libfc/fc_lport.c
blob: 684c5e361a286d60b85c8385a5822e259952e7f3 (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
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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright(c) 2007 Intel Corporation. All rights reserved.
 *
 * Maintained at www.Open-FCoE.org
 */

/*
 * PORT LOCKING NOTES
 *
 * These comments only apply to the 'port code' which consists of the lport,
 * disc and rport blocks.
 *
 * MOTIVATION
 *
 * The lport, disc and rport blocks all have mutexes that are used to protect
 * those objects. The main motivation for these locks is to prevent from
 * having an lport reset just before we send a frame. In that scenario the
 * lport's FID would get set to zero and then we'd send a frame with an
 * invalid SID. We also need to ensure that states don't change unexpectedly
 * while processing another state.
 *
 * HIERARCHY
 *
 * The following hierarchy defines the locking rules. A greater lock
 * may be held before acquiring a lesser lock, but a lesser lock should never
 * be held while attempting to acquire a greater lock. Here is the hierarchy-
 *
 * lport > disc, lport > rport, disc > rport
 *
 * CALLBACKS
 *
 * The callbacks cause complications with this scheme. There is a callback
 * from the rport (to either lport or disc) and a callback from disc
 * (to the lport).
 *
 * As rports exit the rport state machine a callback is made to the owner of
 * the rport to notify success or failure. Since the callback is likely to
 * cause the lport or disc to grab its lock we cannot hold the rport lock
 * while making the callback. To ensure that the rport is not free'd while
 * processing the callback the rport callbacks are serialized through a
 * single-threaded workqueue. An rport would never be free'd while in a
 * callback handler because no other rport work in this queue can be executed
 * at the same time.
 *
 * When discovery succeeds or fails a callback is made to the lport as
 * notification. Currently, successful discovery causes the lport to take no
 * action. A failure will cause the lport to reset. There is likely a circular
 * locking problem with this implementation.
 */

/*
 * LPORT LOCKING
 *
 * The critical sections protected by the lport's mutex are quite broad and
 * may be improved upon in the future. The lport code and its locking doesn't
 * influence the I/O path, so excessive locking doesn't penalize I/O
 * performance.
 *
 * The strategy is to lock whenever processing a request or response. Note
 * that every _enter_* function corresponds to a state change. They generally
 * change the lports state and then send a request out on the wire. We lock
 * before calling any of these functions to protect that state change. This
 * means that the entry points into the lport block manage the locks while
 * the state machine can transition between states (i.e. _enter_* functions)
 * while always staying protected.
 *
 * When handling responses we also hold the lport mutex broadly. When the
 * lport receives the response frame it locks the mutex and then calls the
 * appropriate handler for the particuar response. Generally a response will
 * trigger a state change and so the lock must already be held.
 *
 * Retries also have to consider the locking. The retries occur from a work
 * context and the work function will lock the lport and then retry the state
 * (i.e. _enter_* function).
 */

#include <linux/timer.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <asm/unaligned.h>

#include <scsi/fc/fc_gs.h>

#include <scsi/libfc.h>
#include <scsi/fc_encode.h>
#include <linux/scatterlist.h>

#include "fc_libfc.h"

/* Fabric IDs to use for point-to-point mode, chosen on whims. */
#define FC_LOCAL_PTP_FID_LO   0x010101
#define FC_LOCAL_PTP_FID_HI   0x010102

#define	DNS_DELAY	      3 /* Discovery delay after RSCN (in seconds)*/

static void fc_lport_error(struct fc_lport *, struct fc_frame *);

static void fc_lport_enter_reset(struct fc_lport *);
static void fc_lport_enter_flogi(struct fc_lport *);
static void fc_lport_enter_dns(struct fc_lport *);
static void fc_lport_enter_ns(struct fc_lport *, enum fc_lport_state);
static void fc_lport_enter_scr(struct fc_lport *);
static void fc_lport_enter_ready(struct fc_lport *);
static void fc_lport_enter_logo(struct fc_lport *);
static void fc_lport_enter_fdmi(struct fc_lport *lport);
static void fc_lport_enter_ms(struct fc_lport *, enum fc_lport_state);

static const char *fc_lport_state_names[] = {
	[LPORT_ST_DISABLED] = "disabled",
	[LPORT_ST_FLOGI] =    "FLOGI",
	[LPORT_ST_DNS] =      "dNS",
	[LPORT_ST_RNN_ID] =   "RNN_ID",
	[LPORT_ST_RSNN_NN] =  "RSNN_NN",
	[LPORT_ST_RSPN_ID] =  "RSPN_ID",
	[LPORT_ST_RFT_ID] =   "RFT_ID",
	[LPORT_ST_RFF_ID] =   "RFF_ID",
	[LPORT_ST_FDMI] =     "FDMI",
	[LPORT_ST_RHBA] =     "RHBA",
	[LPORT_ST_RPA] =      "RPA",
	[LPORT_ST_DHBA] =     "DHBA",
	[LPORT_ST_DPRT] =     "DPRT",
	[LPORT_ST_SCR] =      "SCR",
	[LPORT_ST_READY] =    "Ready",
	[LPORT_ST_LOGO] =     "LOGO",
	[LPORT_ST_RESET] =    "reset",
};

/**
 * struct fc_bsg_info - FC Passthrough managemet structure
 * @job:      The passthrough job
 * @lport:    The local port to pass through a command
 * @rsp_code: The expected response code
 * @sg:	      job->reply_payload.sg_list
 * @nents:    job->reply_payload.sg_cnt
 * @offset:   The offset into the response data
 */
struct fc_bsg_info {
	struct bsg_job *job;
	struct fc_lport *lport;
	u16 rsp_code;
	struct scatterlist *sg;
	u32 nents;
	size_t offset;
};

/**
 * fc_frame_drop() - Dummy frame handler
 * @lport: The local port the frame was received on
 * @fp:	   The received frame
 */
static int fc_frame_drop(struct fc_lport *lport, struct fc_frame *fp)
{
	fc_frame_free(fp);
	return 0;
}

/**
 * fc_lport_rport_callback() - Event handler for rport events
 * @lport: The lport which is receiving the event
 * @rdata: private remote port data
 * @event: The event that occurred
 *
 * Locking Note: The rport lock should not be held when calling
 *		 this function.
 */
static void fc_lport_rport_callback(struct fc_lport *lport,
				    struct fc_rport_priv *rdata,
				    enum fc_rport_event event)
{
	FC_LPORT_DBG(lport, "Received a %d event for port (%6.6x)\n", event,
		     rdata->ids.port_id);

	mutex_lock(&lport->lp_mutex);
	switch (event) {
	case RPORT_EV_READY:
		if (lport->state == LPORT_ST_DNS) {
			lport->dns_rdata = rdata;
			fc_lport_enter_ns(lport, LPORT_ST_RNN_ID);
		} else if (lport->state == LPORT_ST_FDMI) {
			lport->ms_rdata = rdata;
			fc_lport_enter_ms(lport, LPORT_ST_DHBA);
		} else {
			FC_LPORT_DBG(lport, "Received an READY event "
				     "on port (%6.6x) for the directory "
				     "server, but the lport is not "
				     "in the DNS or FDMI state, it's in the "
				     "%d state", rdata->ids.port_id,
				     lport->state);
			fc_rport_logoff(rdata);
		}
		break;
	case RPORT_EV_LOGO:
	case RPORT_EV_FAILED:
	case RPORT_EV_STOP:
		if (rdata->ids.port_id == FC_FID_DIR_SERV)
			lport->dns_rdata = NULL;
		else if (rdata->ids.port_id == FC_FID_MGMT_SERV)
			lport->ms_rdata = NULL;
		break;
	case RPORT_EV_NONE:
		break;
	}
	mutex_unlock(&lport->lp_mutex);
}

/**
 * fc_lport_state() - Return a string which represents the lport's state
 * @lport: The lport whose state is to converted to a string
 */
static const char *fc_lport_state(struct fc_lport *lport)
{
	const char *cp;

	cp = fc_lport_state_names[lport->state];
	if (!cp)
		cp = "unknown";
	return cp;
}

/**
 * fc_lport_ptp_setup() - Create an rport for point-to-point mode
 * @lport:	 The lport to attach the ptp rport to
 * @remote_fid:	 The FID of the ptp rport
 * @remote_wwpn: The WWPN of the ptp rport
 * @remote_wwnn: The WWNN of the ptp rport
 */
static void fc_lport_ptp_setup(struct fc_lport *lport,
			       u32 remote_fid, u64 remote_wwpn,
			       u64 remote_wwnn)
{
	lockdep_assert_held(&lport->lp_mutex);

	if (lport->ptp_rdata) {
		fc_rport_logoff(lport->ptp_rdata);
		kref_put(&lport->ptp_rdata->kref, fc_rport_destroy);
	}
	mutex_lock(&lport->disc.disc_mutex);
	lport->ptp_rdata = fc_rport_create(lport, remote_fid);
	kref_get(&lport->ptp_rdata->kref);
	lport->ptp_rdata->ids.port_name = remote_wwpn;
	lport->ptp_rdata->ids.node_name = remote_wwnn;
	mutex_unlock(&lport->disc.disc_mutex);

	fc_rport_login(lport->ptp_rdata);

	fc_lport_enter_ready(lport);
}

/**
 * fc_get_host_port_state() - Return the port state of the given Scsi_Host
 * @shost:  The SCSI host whose port state is to be determined
 */
void fc_get_host_port_state(struct Scsi_Host *shost)
{
	struct fc_lport *lport = shost_priv(shost);

	mutex_lock(&lport->lp_mutex);
	if (!lport->link_up)
		fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
	else
		switch (lport->state) {
		case LPORT_ST_READY:
			fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
			break;
		default:
			fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
		}
	mutex_unlock(&lport->lp_mutex);
}
EXPORT_SYMBOL(fc_get_host_port_state);

/**
 * fc_get_host_speed() - Return the speed of the given Scsi_Host
 * @shost: The SCSI host whose port speed is to be determined
 */
void fc_get_host_speed(struct Scsi_Host *shost)
{
	struct fc_lport *lport = shost_priv(shost);

	fc_host_speed(shost) = lport->link_speed;
}
EXPORT_SYMBOL(fc_get_host_speed);

/**
 * fc_get_host_stats() - Return the Scsi_Host's statistics
 * @shost: The SCSI host whose statistics are to be returned
 */
struct fc_host_statistics *fc_get_host_stats(struct Scsi_Host *shost)
{
	struct fc_host_statistics *fc_stats;
	struct fc_lport *lport = shost_priv(shost);
	unsigned int cpu;
	u64 fcp_in_bytes = 0;
	u64 fcp_out_bytes = 0;

	fc_stats = &lport->host_stats;
	memset(fc_stats, 0, sizeof(struct fc_host_statistics));

	fc_stats->seconds_since_last_reset = (jiffies - lport->boot_time) / HZ;

	for_each_possible_cpu(cpu) {
		struct fc_stats *stats;

		stats = per_cpu_ptr(lport->stats, cpu);

		fc_stats->tx_frames += stats->TxFrames;
		fc_stats->tx_words += stats->TxWords;
		fc_stats->rx_frames += stats->RxFrames;
		fc_stats->rx_words += stats->RxWords;
		fc_stats->error_frames += stats->ErrorFrames;
		fc_stats->invalid_crc_count += stats->InvalidCRCCount;
		fc_stats->fcp_input_requests += stats->InputRequests;
		fc_stats->fcp_output_requests += stats->OutputRequests;
		fc_stats->fcp_control_requests += stats->ControlRequests;
		fcp_in_bytes += stats->InputBytes;
		fcp_out_bytes += stats->OutputBytes;
		fc_stats->fcp_packet_alloc_failures += stats->FcpPktAllocFails;
		fc_stats->fcp_packet_aborts += stats->FcpPktAborts;
		fc_stats->fcp_frame_alloc_failures += stats->FcpFrameAllocFails;
		fc_stats->link_failure_count += stats->LinkFailureCount;
	}
	fc_stats->fcp_input_megabytes = div_u64(fcp_in_bytes, 1000000);
	fc_stats->fcp_output_megabytes = div_u64(fcp_out_bytes, 1000000);
	fc_stats->lip_count = -1;
	fc_stats->nos_count = -1;
	fc_stats->loss_of_sync_count = -1;
	fc_stats->loss_of_signal_count = -1;
	fc_stats->prim_seq_protocol_err_count = -1;
	fc_stats->dumped_frames = -1;

	/* update exches stats */
	fc_exch_update_stats(lport);

	return fc_stats;
}
EXPORT_SYMBOL(fc_get_host_stats);

/**
 * fc_lport_flogi_fill() - Fill in FLOGI command for request
 * @lport: The local port the FLOGI is for
 * @flogi: The FLOGI command
 * @op:	   The opcode
 */
static void fc_lport_flogi_fill(struct fc_lport *lport,
				struct fc_els_flogi *flogi,
				unsigned int op)
{
	struct fc_els_csp *sp;
	struct fc_els_cssp *cp;

	memset(flogi, 0, sizeof(*flogi));
	flogi->fl_cmd = (u8) op;
	put_unaligned_be64(lport->wwpn, &flogi->fl_wwpn);
	put_unaligned_be64(lport->wwnn, &flogi->fl_wwnn);
	sp = &flogi->fl_csp;
	sp->sp_hi_ver = 0x20;
	sp->sp_lo_ver = 0x20;
	sp->sp_bb_cred = htons(10);	/* this gets set by gateway */
	sp->sp_bb_data = htons((u16) lport->mfs);
	cp = &flogi->fl_cssp[3 - 1];	/* class 3 parameters */
	cp->cp_class = htons(FC_CPC_VALID | FC_CPC_SEQ);
	if (op != ELS_FLOGI) {
		sp->sp_features = htons(FC_SP_FT_CIRO);
		sp->sp_tot_seq = htons(255);	/* seq. we accept */
		sp->sp_rel_off = htons(0x1f);
		sp->sp_e_d_tov = htonl(lport->e_d_tov);

		cp->cp_rdfs = htons((u16) lport->mfs);
		cp->cp_con_seq = htons(255);
		cp->cp_open_seq = 1;
	}
}

/**
 * fc_lport_add_fc4_type() - Add a supported FC-4 type to a local port
 * @lport: The local port to add a new FC-4 type to
 * @type:  The new FC-4 type
 */
static void fc_lport_add_fc4_type(struct fc_lport *lport, enum fc_fh_type type)
{
	__be32 *mp;

	mp = &lport->fcts.ff_type_map[type / FC_NS_BPW];
	*mp = htonl(ntohl(*mp) | 1UL << (type % FC_NS_BPW));
}

/**
 * fc_lport_recv_rlir_req() - Handle received Registered Link Incident Report.
 * @lport: Fibre Channel local port receiving the RLIR
 * @fp:	   The RLIR request frame
 */
static void fc_lport_recv_rlir_req(struct fc_lport *lport, struct fc_frame *fp)
{
	lockdep_assert_held(&lport->lp_mutex);

	FC_LPORT_DBG(lport, "Received RLIR request while in state %s\n",
		     fc_lport_state(lport));

	fc_seq_els_rsp_send(fp, ELS_LS_ACC, NULL);
	fc_frame_free(fp);
}

/**
 * fc_lport_recv_echo_req() - Handle received ECHO request
 * @lport: The local port receiving the ECHO
 * @fp:	   ECHO request frame
 */
static void fc_lport_recv_echo_req(struct fc_lport *lport,
				   struct fc_frame *in_fp)
{
	struct fc_frame *fp;
	unsigned int len;
	void *pp;
	void *dp;

	lockdep_assert_held(&lport->lp_mutex);

	FC_LPORT_DBG(lport, "Received ECHO request while in state %s\n",
		     fc_lport_state(lport));

	len = fr_len(in_fp) - sizeof(struct fc_frame_header);
	pp = fc_frame_payload_get(in_fp, len);

	if (len < sizeof(__be32))
		len = sizeof(__be32);

	fp = fc_frame_alloc(lport, len);
	if (fp) {
		dp = fc_frame_payload_get(fp, len);
		memcpy(dp, pp, len);
		*((__be32 *)dp) = htonl(ELS_LS_ACC << 24);
		fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, 0);
		lport->tt.frame_send(lport, fp);
	}
	fc_frame_free(in_fp);
}

/**
 * fc_lport_recv_rnid_req() - Handle received Request Node ID data request
 * @lport: The local port receiving the RNID
 * @fp:	   The RNID request frame
 */
static void fc_lport_recv_rnid_req(struct fc_lport *lport,
				   struct fc_frame *in_fp)
{
	struct fc_frame *fp;
	struct fc_els_rnid *req;
	struct {
		struct fc_els_rnid_resp rnid;
		struct fc_els_rnid_cid cid;
		struct fc_els_rnid_gen gen;
	} *rp;
	struct fc_seq_els_data rjt_data;
	u8 fmt;
	size_t len;

	lockdep_assert_held(&lport->lp_mutex);

	FC_LPORT_DBG(lport, "Received RNID request while in state %s\n",
		     fc_lport_state(lport));

	req = fc_frame_payload_get(in_fp, sizeof(*req));
	if (!req) {
		rjt_data.reason = ELS_RJT_LOGIC;
		rjt_data.explan = ELS_EXPL_NONE;
		fc_seq_els_rsp_send(in_fp, ELS_LS_RJT, &rjt_data);
	} else {
		fmt = req->rnid_fmt;
		len = sizeof(*rp);
		if (fmt != ELS_RNIDF_GEN ||
		    ntohl(lport->rnid_gen.rnid_atype) == 0) {
			fmt = ELS_RNIDF_NONE;	/* nothing to provide */
			len -= sizeof(rp->gen);
		}
		fp = fc_frame_alloc(lport, len);
		if (fp) {
			rp = fc_frame_payload_get(fp, len);
			memset(rp, 0, len);
			rp->rnid.rnid_cmd = ELS_LS_ACC;
			rp->rnid.rnid_fmt = fmt;
			rp->rnid.rnid_cid_len = sizeof(rp->cid);
			rp->cid.rnid_wwpn = htonll(lport->wwpn);
			rp->cid.rnid_wwnn = htonll(lport->wwnn);
			if (fmt == ELS_RNIDF_GEN) {
				rp->rnid.rnid_sid_len = sizeof(rp->gen);
				memcpy(&rp->gen, &lport->rnid_gen,
				       sizeof(rp->gen));
			}
			fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, 0);
			lport->tt.frame_send(lport, fp);
		}
	}
	fc_frame_free(in_fp);
}

/**
 * fc_lport_recv_logo_req() - Handle received fabric LOGO request
 * @lport: The local port receiving the LOGO
 * @fp:	   The LOGO request frame
 */
static void fc_lport_recv_logo_req(struct fc_lport *lport, struct fc_frame *fp)
{
	lockdep_assert_held(&lport->lp_mutex);

	fc_seq_els_rsp_send(fp, ELS_LS_ACC, NULL);
	fc_lport_enter_reset(lport);
	fc_frame_free(fp);
}

/**
 * fc_fabric_login() - Start the lport state machine
 * @lport: The local port that should log into the fabric
 *
 * Locking Note: This function should not be called
 *		 with the lport lock held.
 */
int fc_fabric_login(struct fc_lport *lport)
{
	int rc = -1;

	mutex_lock(&lport->lp_mutex);
	if (lport->state == LPORT_ST_DISABLED ||
	    lport->state == LPORT_ST_LOGO) {
		fc_lport_state_enter(lport, LPORT_ST_RESET);
		fc_lport_enter_reset(lport);
		rc = 0;
	}
	mutex_unlock(&lport->lp_mutex);

	return rc;
}
EXPORT_SYMBOL(fc_fabric_login);

/**
 * __fc_linkup() - Handler for transport linkup events
 * @lport: The lport whose link is up
 */
void __fc_linkup(struct fc_lport *lport)
{
	lockdep_assert_held(&lport->lp_mutex);

	if (!lport->link_up) {
		lport->link_up = 1;

		if (lport->state == LPORT_ST_RESET)
			fc_lport_enter_flogi(lport);
	}
}

/**
 * fc_linkup() - Handler for transport linkup events
 * @lport: The local port whose link is up
 */
void fc_linkup(struct fc_lport *lport)
{
	printk(KERN_INFO "host%d: libfc: Link up on port (%6.6x)\n",
	       lport->host->host_no, lport->port_id);

	mutex_lock(&lport->lp_mutex);
	__fc_linkup(lport);
	mutex_unlock(&lport->lp_mutex);
}
EXPORT_SYMBOL(fc_linkup);

/**
 * __fc_linkdown() - Handler for transport linkdown events
 * @lport: The lport whose link is down
 */
void __fc_linkdown(struct fc_lport *lport)
{
	lockdep_assert_held(&lport->lp_mutex);

	if (lport->link_up) {
		lport->link_up = 0;
		fc_lport_enter_reset(lport);
		lport->tt.fcp_cleanup(lport);
	}
}

/**
 * fc_linkdown() - Handler for transport linkdown events
 * @lport: The local port whose link is down
 */
void fc_linkdown(struct fc_lport *lport)
{
	printk(KERN_INFO "host%d: libfc: Link down on port (%6.6x)\n",
	       lport->host->host_no, lport->port_id);

	mutex_lock(&lport->lp_mutex);
	__fc_linkdown(lport);
	mutex_unlock(&lport->lp_mutex);
}
EXPORT_SYMBOL(fc_linkdown);

/**
 * fc_fabric_logoff() - Logout of the fabric
 * @lport: The local port to logoff the fabric
 *
 * Return value:
 *	0 for success, -1 for failure
 */
int fc_fabric_logoff(struct fc_lport *lport)
{
	lport->tt.disc_stop_final(lport);
	mutex_lock(&lport->lp_mutex);
	if (lport->dns_rdata)
		fc_rport_logoff(lport->dns_rdata);
	mutex_unlock(&lport->lp_mutex);
	fc_rport_flush_queue();
	mutex_lock(&lport->lp_mutex);
	fc_lport_enter_logo(lport);
	mutex_unlock(&lport->lp_mutex);
	cancel_delayed_work_sync(&lport->retry_work);
	return 0;
}
EXPORT_SYMBOL(fc_fabric_logoff);

/**
 * fc_lport_destroy() - Unregister a fc_lport
 * @lport: The local port to unregister
 *
 * Note:
 * exit routine for fc_lport instance
 * clean-up all the allocated memory
 * and free up other system resources.
 *
 */
int fc_lport_destroy(struct fc_lport *lport)
{
	mutex_lock(&lport->lp_mutex);
	lport->state = LPORT_ST_DISABLED;
	lport->link_up = 0;
	lport->tt.frame_send = fc_frame_drop;
	mutex_unlock(&lport->lp_mutex);

	lport->tt.fcp_abort_io(lport);
	lport->tt.disc_stop_final(lport);
	lport->tt.exch_mgr_reset(lport, 0, 0);
	cancel_delayed_work_sync(&lport->retry_work);
	fc_fc4_del_lport(lport);
	return 0;
}
EXPORT_SYMBOL(fc_lport_destroy);

/**
 * fc_set_mfs() - Set the maximum frame size for a local port
 * @lport: The local port to set the MFS for
 * @mfs:   The new MFS
 */
int fc_set_mfs(struct fc_lport *lport, u32 mfs)
{
	unsigned int old_mfs;
	int rc = -EINVAL;

	mutex_lock(&lport->lp_mutex);

	old_mfs = lport->mfs;

	if (mfs >= FC_MIN_MAX_FRAME) {
		mfs &= ~3;
		if (mfs > FC_MAX_FRAME)
			mfs = FC_MAX_FRAME;
		mfs -= sizeof(struct fc_frame_header);
		lport->mfs = mfs;
		rc = 0;
	}

	if (!rc && mfs < old_mfs)
		fc_lport_enter_reset(lport);

	mutex_unlock(&lport->lp_mutex);

	return rc;
}
EXPORT_SYMBOL(fc_set_mfs);

/**
 * fc_lport_disc_callback() - Callback for discovery events
 * @lport: The local port receiving the event
 * @event: The discovery event
 */
static void fc_lport_disc_callback(struct fc_lport *lport,
				   enum fc_disc_event event)
{
	switch (event) {
	case DISC_EV_SUCCESS:
		FC_LPORT_DBG(lport, "Discovery succeeded\n");
		break;
	case DISC_EV_FAILED:
		printk(KERN_ERR "host%d: libfc: "
		       "Discovery failed for port (%6.6x)\n",
		       lport->host->host_no, lport->port_id);
		mutex_lock(&lport->lp_mutex);
		fc_lport_enter_reset(lport);
		mutex_unlock(&lport->lp_mutex);
		break;
	case DISC_EV_NONE:
		WARN_ON(1);
		break;
	}
}

/**
 * fc_rport_enter_ready() - Enter the ready state and start discovery
 * @lport: The local port that is ready
 */
static void fc_lport_enter_ready(struct fc_lport *lport)
{
	lockdep_assert_held(&lport->lp_mutex);

	FC_LPORT_DBG(lport, "Entered READY from state %s\n",
		     fc_lport_state(lport));

	fc_lport_state_enter(lport, LPORT_ST_READY);
	if (lport->vport)
		fc_vport_set_state(lport->vport, FC_VPORT_ACTIVE);
	fc_vports_linkchange(lport);

	if (!lport->ptp_rdata)
		lport->tt.disc_start(fc_lport_disc_callback, lport);
}

/**
 * fc_lport_set_port_id() - set the local port Port ID
 * @lport: The local port which will have its Port ID set.
 * @port_id: The new port ID.
 * @fp: The frame containing the incoming request, or NULL.
 */
static void fc_lport_set_port_id(struct fc_lport *lport, u32 port_id,
				 struct fc_frame *fp)
{
	lockdep_assert_held(&lport->lp_mutex);

	if (port_id)
		printk(KERN_INFO "host%d: Assigned Port ID %6.6x\n",
		       lport->host->host_no, port_id);

	lport->port_id = port_id;

	/* Update the fc_host */
	fc_host_port_id(lport->host) = port_id;

	if (lport->tt.lport_set_port_id)
		lport->tt.lport_set_port_id(lport, port_id, fp);
}

/**
 * fc_lport_set_port_id() - set the local port Port ID for point-to-multipoint
 * @lport: The local port which will have its Port ID set.
 * @port_id: The new port ID.
 *
 * Called by the lower-level driver when transport sets the local port_id.
 * This is used in VN_port to VN_port mode for FCoE, and causes FLOGI and
 * discovery to be skipped.
 */
void fc_lport_set_local_id(struct fc_lport *lport, u32 port_id)
{
	mutex_lock(&lport->lp_mutex);

	fc_lport_set_port_id(lport, port_id, NULL);

	switch (lport->state) {
	case LPORT_ST_RESET:
	case LPORT_ST_FLOGI:
		if (port_id)
			fc_lport_enter_ready(lport);
		break;
	default:
		break;
	}
	mutex_unlock(&lport->lp_mutex);
}
EXPORT_SYMBOL(fc_lport_set_local_id);

/**
 * fc_lport_recv_flogi_req() - Receive a FLOGI request
 * @lport: The local port that received the request
 * @rx_fp: The FLOGI frame
 *
 * A received FLOGI request indicates a point-to-point connection.
 * Accept it with the common service parameters indicating our N port.
 * Set up to do a PLOGI if we have the higher-number WWPN.
 */
static void fc_lport_recv_flogi_req(struct fc_lport *lport,
				    struct fc_frame *rx_fp)
{
	struct fc_frame *fp;
	struct fc_frame_header *fh;
	struct fc_els_flogi *flp;
	struct fc_els_flogi *new_flp;
	u64 remote_wwpn;
	u32 remote_fid;
	u32 local_fid;

	lockdep_assert_held(&lport->lp_mutex);

	FC_LPORT_DBG(lport, "Received FLOGI request while in state %s\n",
		     fc_lport_state(lport));

	remote_fid = fc_frame_sid(rx_fp);
	flp = fc_frame_payload_get(rx_fp, sizeof(*flp));
	if (!flp)
		goto out;
	remote_wwpn = get_unaligned_be64(&flp->fl_wwpn);
	if (remote_wwpn == lport->wwpn) {
		printk(KERN_WARNING "host%d: libfc: Received FLOGI from port "
		       "with same WWPN %16.16llx\n",
		       lport->host->host_no, remote_wwpn);
		goto out;
	}
	FC_LPORT_DBG(lport, "FLOGI from port WWPN %16.16llx\n", remote_wwpn);

	/*
	 * XXX what is the right thing to do for FIDs?
	 * The originator might expect our S_ID to be 0xfffffe.
	 * But if so, both of us could end up with the same FID.
	 */
	local_fid = FC_LOCAL_PTP_FID_LO;
	if (remote_wwpn < lport->wwpn) {
		local_fid = FC_LOCAL_PTP_FID_HI;
		if (!remote_fid || remote_fid == local_fid)
			remote_fid = FC_LOCAL_PTP_FID_LO;
	} else if (!remote_fid) {
		remote_fid = FC_LOCAL_PTP_FID_HI;
	}

	fc_lport_set_port_id(lport, local_fid, rx_fp);

	fp = fc_frame_alloc(lport, sizeof(*flp));
	if (fp) {
		new_flp = fc_frame_payload_get(fp, sizeof(*flp));
		fc_lport_flogi_fill(lport, new_flp, ELS_FLOGI);
		new_flp->fl_cmd = (u8) ELS_LS_ACC;

		/*
		 * Send the response.  If this fails, the originator should
		 * repeat the sequence.
		 */
		fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
		fh = fc_frame_header_get(fp);
		hton24(fh->fh_s_id, local_fid);
		hton24(fh->fh_d_id, remote_fid);
		lport->tt.frame_send(lport, fp);

	} else {
		fc_lport_error(lport, fp);
	}
	fc_lport_ptp_setup(lport, remote_fid, remote_wwpn,
			   get_unaligned_be64(&flp->fl_wwnn));
out:
	fc_frame_free(rx_fp);
}

/**
 * fc_lport_recv_els_req() - The generic lport ELS request handler
 * @lport: The local port that received the request
 * @fp:	   The request frame
 *
 * This function will see if the lport handles the request or
 * if an rport should handle the request.
 *
 * Locking Note: This function should not be called with the lport
 *		 lock held because it will grab the lock.
 */
static void fc_lport_recv_els_req(struct fc_lport *lport,
				  struct fc_frame *fp)
{
	mutex_lock(&lport->lp_mutex);

	/*
	 * Handle special ELS cases like FLOGI, LOGO, and
	 * RSCN here.  These don't require a session.
	 * Even if we had a session, it might not be ready.
	 */
	if (!lport->link_up)
		fc_frame_free(fp);
	else {
		/*
		 * Check opcode.
		 */
		switch (fc_frame_payload_op(fp)) {
		case ELS_FLOGI:
			if (!lport->point_to_multipoint)
				fc_lport_recv_flogi_req(lport, fp);
			else
				fc_rport_recv_req(lport, fp);
			break;
		case ELS_LOGO:
			if (fc_frame_sid(fp) == FC_FID_FLOGI)
				fc_lport_recv_logo_req(lport, fp);
			else
				fc_rport_recv_req(lport, fp);
			break;
		case ELS_RSCN:
			lport->tt.disc_recv_req(lport, fp);
			break;
		case ELS_ECHO:
			fc_lport_recv_echo_req(lport, fp);
			break;
		case ELS_RLIR:
			fc_lport_recv_rlir_req(lport, fp);
			break;
		case ELS_RNID:
			fc_lport_recv_rnid_req(lport, fp);
			break;
		default:
			fc_rport_recv_req(lport, fp);
			break;
		}
	}
	mutex_unlock(&lport->lp_mutex);
}

static int fc_lport_els_prli(struct fc_rport_priv *rdata, u32 spp_len,
			     const struct fc_els_spp *spp_in,
			     struct fc_els_spp *spp_out)
{
	return FC_SPP_RESP_INVL;
}

struct fc4_prov fc_lport_els_prov = {
	.prli = fc_lport_els_prli,
	.recv = fc_lport_recv_els_req,
};

/**
 * fc_lport_recv() - The generic lport request handler
 * @lport: The lport that received the request
 * @fp: The frame the request is in
 *
 * Locking Note: This function should not be called with the lport
 *		 lock held because it may grab the lock.
 */
void fc_lport_recv(struct fc_lport *lport, struct fc_frame *fp)
{
	struct fc_frame_header *fh = fc_frame_header_get(fp);
	struct fc_seq *sp = fr_seq(fp);
	struct fc4_prov *prov;

	/*
	 * Use RCU read lock and module_lock to be sure module doesn't
	 * deregister and get unloaded while we're calling it.
	 * try_module_get() is inlined and accepts a NULL parameter.
	 * Only ELSes and FCP target ops should come through here.
	 * The locking is unfortunate, and a better scheme is being sought.
	 */

	rcu_read_lock();
	if (fh->fh_type >= FC_FC4_PROV_SIZE)
		goto drop;
	prov = rcu_dereference(fc_passive_prov[fh->fh_type]);
	if (!prov || !try_module_get(prov->module))
		goto drop;
	rcu_read_unlock();
	prov->recv(lport, fp);
	module_put(prov->module);
	return;
drop:
	rcu_read_unlock();
	FC_LPORT_DBG(lport, "dropping unexpected frame type %x\n", fh->fh_type);
	fc_frame_free(fp);
	if (sp)
		fc_exch_done(sp);
}
EXPORT_SYMBOL(fc_lport_recv);

/**
 * fc_lport_reset() - Reset a local port
 * @lport: The local port which should be reset
 *
 * Locking Note: This functions should not be called with the
 *		 lport lock held.
 */
int fc_lport_reset(struct fc_lport *lport)
{
	cancel_delayed_work_sync(&lport->retry_work);
	mutex_lock(&lport->lp_mutex);
	fc_lport_enter_reset(lport);
	mutex_unlock(&lport->lp_mutex);
	return 0;
}
EXPORT_SYMBOL(fc_lport_reset);

/**
 * fc_lport_reset_locked() - Reset the local port w/ the lport lock held
 * @lport: The local port to be reset
 */
static void fc_lport_reset_locked(struct fc_lport *lport)
{
	lockdep_assert_held(&lport->lp_mutex);

	if (lport->dns_rdata) {
		fc_rport_logoff(lport->dns_rdata);
		lport->dns_rdata = NULL;
	}

	if (lport->ptp_rdata) {
		fc_rport_logoff(lport->ptp_rdata);
		kref_put(&lport->ptp_rdata->kref, fc_rport_destroy);
		lport->ptp_rdata = NULL;
	}

	lport->tt.disc_stop(lport);

	lport->tt.exch_mgr_reset(lport, 0, 0);
	fc_host_fabric_name(lport->host) = 0;

	if (lport->port_id && (!lport->point_to_multipoint || !lport->link_up))
		fc_lport_set_port_id(lport, 0, NULL);
}

/**
 * fc_lport_enter_reset() - Reset the local port
 * @lport: The local port to be reset
 */
static void fc_lport_enter_reset(struct fc_lport *lport)
{
	lockdep_assert_held(&lport->lp_mutex);

	FC_LPORT_DBG(lport, "Entered RESET state from %s state\n",
		     fc_lport_state(lport));

	if (lport->state == LPORT_ST_DISABLED || lport->state == LPORT_ST_LOGO)
		return;

	if (lport->vport) {
		if (lport->link_up)
			fc_vport_set_state(lport->vport, FC_VPORT_INITIALIZING);
		else
			fc_vport_set_state(lport->vport, FC_VPORT_LINKDOWN);
	}
	fc_lport_state_enter(lport, LPORT_ST_RESET);
	fc_host_post_event(lport->host, fc_get_event_number(),
			   FCH_EVT_LIPRESET, 0);
	fc_vports_linkchange(lport);
	fc_lport_reset_locked(lport);
	if (lport->link_up)
		fc_lport_enter_flogi(lport);
}

/**
 * fc_lport_enter_disabled() - Disable the local port
 * @lport: The local port to be reset
 */
static void fc_lport_enter_disabled(struct fc_lport *lport)
{
	lockdep_assert_held(&lport->lp_mutex);

	FC_LPORT_DBG(lport, "Entered disabled state from %s state\n",
		     fc_lport_state(lport));

	fc_lport_state_enter(lport, LPORT_ST_DISABLED);
	fc_vports_linkchange(lport);
	fc_lport_reset_locked(lport);
}

/**
 * fc_lport_error() - Handler for any errors
 * @lport: The local port that the error was on
 * @fp:	   The error code encoded in a frame pointer
 *
 * If the error was caused by a resource allocation failure
 * then wait for half a second and retry, otherwise retry
 * after the e_d_tov time.
 */
static void fc_lport_error(struct fc_lport *lport, struct fc_frame *fp)
{
	unsigned long delay = 0;
	FC_LPORT_DBG(lport, "Error %ld in state %s, retries %d\n",
		     IS_ERR(fp) ? -PTR_ERR(fp) : 0, fc_lport_state(lport),
		     lport->retry_count);

	if (PTR_ERR(fp) == -FC_EX_CLOSED)
		return;

	/*
	 * Memory allocation failure, or the exchange timed out
	 * or we received LS_RJT.
	 * Retry after delay
	 */
	if (lport->retry_count < lport->max_retry_count) {
		lport->retry_count++;
		if (!fp)
			delay = msecs_to_jiffies(500);
		else
			delay =	msecs_to_jiffies(lport->e_d_tov);

		schedule_delayed_work(&lport->retry_work, delay);
	} else
		fc_lport_enter_reset(lport);
}

/**
 * fc_lport_ns_resp() - Handle response to a name server
 *			registration exchange
 * @sp:	    current sequence in exchange
 * @fp:	    response frame
 * @lp_arg: Fibre Channel host port instance
 *
 * Locking Note: This function will be called without the lport lock
 * held, but it will lock, call an _enter_* function or fc_lport_error()
 * and then unlock the lport.
 */
static void fc_lport_ns_resp(struct fc_seq *sp, struct fc_frame *fp,
			     void *lp_arg)
{
	struct fc_lport *lport = lp_arg;
	struct fc_frame_header *fh;
	struct fc_ct_hdr *ct;

	FC_LPORT_DBG(lport, "Received a ns %s\n", fc_els_resp_type(fp));

	if (fp == ERR_PTR(-FC_EX_CLOSED))
		return;

	mutex_lock(&lport->lp_mutex);

	if (lport->state < LPORT_ST_RNN_ID || lport->state > LPORT_ST_RFF_ID) {
		FC_LPORT_DBG(lport, "Received a name server response, "
			     "but in state %s\n", fc_lport_state(lport));
		if (IS_ERR(fp))
			goto err;
		goto out;
	}

	if (IS_ERR(fp)) {
		fc_lport_error(lport, fp);
		goto err;
	}

	fh = fc_frame_header_get(fp);
	ct = fc_frame_payload_get(fp, sizeof(*ct));

	if (fh && ct && fh->fh_type == FC_TYPE_CT &&
	    ct->ct_fs_type == FC_FST_DIR &&
	    ct->ct_fs_subtype == FC_NS_SUBTYPE &&
	    ntohs(ct->ct_cmd) == FC_FS_ACC)
		switch (lport->state) {
		case LPORT_ST_RNN_ID:
			fc_lport_enter_ns(lport, LPORT_ST_RSNN_NN);
			break;
		case LPORT_ST_RSNN_NN:
			fc_lport_enter_ns(lport, LPORT_ST_RSPN_ID);
			break;
		case LPORT_ST_RSPN_ID:
			fc_lport_enter_ns(lport, LPORT_ST_RFT_ID);
			break;
		case LPORT_ST_RFT_ID:
			fc_lport_enter_ns(lport, LPORT_ST_RFF_ID);
			break;
		case LPORT_ST_RFF_ID:
			if (lport->fdmi_enabled)
				fc_lport_enter_fdmi(lport);
			else
				fc_lport_enter_scr(lport);
			break;
		default:
			/* should have already been caught by state checks */
			break;
		}
	else
		fc_lport_error(lport, fp);
out:
	fc_frame_free(fp);
err:
	mutex_unlock(&lport->lp_mutex);
}

/**
 * fc_lport_ms_resp() - Handle response to a management server
 *			exchange
 * @sp:	    current sequence in exchange
 * @fp:	    response frame
 * @lp_arg: Fibre Channel host port instance
 *
 * Locking Note: This function will be called without the lport lock
 * held, but it will lock, call an _enter_* function or fc_lport_error()
 * and then unlock the lport.
 */
static void fc_lport_ms_resp(struct fc_seq *sp, struct fc_frame *fp,
			     void *lp_arg)
{
	struct fc_lport *lport = lp_arg;
	struct fc_frame_header *fh;
	struct fc_ct_hdr *ct;

	FC_LPORT_DBG(lport, "Received a ms %s\n", fc_els_resp_type(fp));

	if (fp == ERR_PTR(-FC_EX_CLOSED))
		return;

	mutex_lock(&lport->lp_mutex);

	if (lport->state < LPORT_ST_RHBA || lport->state > LPORT_ST_DPRT) {
		FC_LPORT_DBG(lport, "Received a management server response, "
			     "but in state %s\n", fc_lport_state(lport));
		if (IS_ERR(fp))
			goto err;
		goto out;
	}

	if (IS_ERR(fp)) {
		fc_lport_error(lport, fp);
		goto err;
	}

	fh = fc_frame_header_get(fp);
	ct = fc_frame_payload_get(fp, sizeof(*ct));

	if (fh && ct && fh->fh_type == FC_TYPE_CT &&
	    ct->ct_fs_type == FC_FST_MGMT &&
	    ct->ct_fs_subtype == FC_FDMI_SUBTYPE) {
		FC_LPORT_DBG(lport, "Received a management server response, "
				    "reason=%d explain=%d\n",
				    ct->ct_reason,
				    ct->ct_explan);

		switch (lport->state) {
		case LPORT_ST_RHBA:
			if (ntohs(ct->ct_cmd) == FC_FS_ACC)
				fc_lport_enter_ms(lport, LPORT_ST_RPA);
			else /* Error Skip RPA */
				fc_lport_enter_scr(lport);
			break;
		case LPORT_ST_RPA:
			fc_lport_enter_scr(lport);
			break;
		case LPORT_ST_DPRT:
			fc_lport_enter_ms(lport, LPORT_ST_RHBA);
			break;
		case LPORT_ST_DHBA:
			fc_lport_enter_ms(lport, LPORT_ST_DPRT);
			break;
		default:
			/* should have already been caught by state checks */
			break;
		}
	} else {
		/* Invalid Frame? */
		fc_lport_error(lport, fp);
	}
out:
	fc_frame_free(fp);
err:
	mutex_unlock(&lport->lp_mutex);
}

/**
 * fc_lport_scr_resp() - Handle response to State Change Register (SCR) request
 * @sp:	    current sequence in SCR exchange
 * @fp:	    response frame
 * @lp_arg: Fibre Channel lport port instance that sent the registration request
 *
 * Locking Note: This function will be called without the lport lock
 * held, but it will lock, call an _enter_* function or fc_lport_error
 * and then unlock the lport.
 */
static void fc_lport_scr_resp(struct fc_seq *sp, struct fc_frame *fp,
			      void *lp_arg)
{
	struct fc_lport *lport = lp_arg;
	u8 op;

	FC_LPORT_DBG(lport, "Received a SCR %s\n", fc_els_resp_type(fp));

	if (fp == ERR_PTR(-FC_EX_CLOSED))
		return;

	mutex_lock(&lport->lp_mutex);

	if (lport->state != LPORT_ST_SCR) {
		FC_LPORT_DBG(lport, "Received a SCR response, but in state "
			     "%s\n", fc_lport_state(lport));
		if (IS_ERR(fp))
			goto err;
		goto out;
	}

	if (IS_ERR(fp)) {
		fc_lport_error(lport, fp);
		goto err;
	}

	op = fc_frame_payload_op(fp);
	if (op == ELS_LS_ACC)
		fc_lport_enter_ready(lport);
	else
		fc_lport_error(lport, fp);

out:
	fc_frame_free(fp);
err:
	mutex_unlock(&lport->lp_mutex);
}

/**
 * fc_lport_enter_scr() - Send a SCR (State Change Register) request
 * @lport: The local port to register for state changes
 */
static void fc_lport_enter_scr(struct fc_lport *lport)
{
	struct fc_frame *fp;

	lockdep_assert_held(&lport->lp_mutex);

	FC_LPORT_DBG(lport, "Entered SCR state from %s state\n",
		     fc_lport_state(lport));

	fc_lport_state_enter(lport, LPORT_ST_SCR);

	fp = fc_frame_alloc(lport, sizeof(struct fc_els_scr));
	if (!fp) {
		fc_lport_error(lport, fp);
		return;
	}

	if (!lport->tt.elsct_send(lport, FC_FID_FCTRL, fp, ELS_SCR,
				  fc_lport_scr_resp, lport,
				  2 * lport->r_a_tov))
		fc_lport_error(lport, NULL);
}

/**
 * fc_lport_enter_ns() - register some object with the name server
 * @lport: Fibre Channel local port to register
 */
static void fc_lport_enter_ns(struct fc_lport *lport, enum fc_lport_state state)
{
	struct fc_frame *fp;
	enum fc_ns_req cmd;
	int size = sizeof(struct fc_ct_hdr);
	size_t len;

	lockdep_assert_held(&lport->lp_mutex);

	FC_LPORT_DBG(lport, "Entered %s state from %s state\n",
		     fc_lport_state_names[state],
		     fc_lport_state(lport));

	fc_lport_state_enter(lport, state);

	switch (state) {
	case LPORT_ST_RNN_ID:
		cmd = FC_NS_RNN_ID;
		size += sizeof(struct fc_ns_rn_id);
		break;
	case LPORT_ST_RSNN_NN:
		len = strnlen(fc_host_symbolic_name(lport->host), 255);
		/* if there is no symbolic name, skip to RFT_ID */
		if (!len)
			return fc_lport_enter_ns(lport, LPORT_ST_RFT_ID);
		cmd = FC_NS_RSNN_NN;
		size += sizeof(struct fc_ns_rsnn) + len;
		break;
	case LPORT_ST_RSPN_ID:
		len = strnlen(fc_host_symbolic_name(lport->host), 255);
		/* if there is no symbolic name, skip to RFT_ID */
		if (!len)
			return fc_lport_enter_ns(lport, LPORT_ST_RFT_ID);
		cmd = FC_NS_RSPN_ID;
		size += sizeof(struct fc_ns_rspn) + len;
		break;
	case LPORT_ST_RFT_ID:
		cmd = FC_NS_RFT_ID;
		size += sizeof(struct fc_ns_rft);
		break;
	case LPORT_ST_RFF_ID:
		cmd = FC_NS_RFF_ID;
		size += sizeof(struct fc_ns_rff_id);
		break;
	default:
		fc_lport_error(lport, NULL);
		return;
	}

	fp = fc_frame_alloc(lport, size);
	if (!fp) {
		fc_lport_error(lport, fp);
		return;
	}

	if (!lport->tt.elsct_send(lport, FC_FID_DIR_SERV, fp, cmd,
				  fc_lport_ns_resp,
				  lport, 3 * lport->r_a_tov))
		fc_lport_error(lport, fp);
}

static struct fc_rport_operations fc_lport_rport_ops = {
	.event_callback = fc_lport_rport_callback,
};

/**
 * fc_rport_enter_dns() - Create a fc_rport for the name server
 * @lport: The local port requesting a remote port for the name server
 */
static void fc_lport_enter_dns(struct fc_lport *lport)
{
	struct fc_rport_priv *rdata;

	lockdep_assert_held(&lport->lp_mutex);

	FC_LPORT_DBG(lport, "Entered DNS state from %s state\n",
		     fc_lport_state(lport));

	fc_lport_state_enter(lport, LPORT_ST_DNS);

	mutex_lock(&lport->disc.disc_mutex);
	rdata = fc_rport_create(lport, FC_FID_DIR_SERV);
	mutex_unlock(&lport->disc.disc_mutex);
	if (!rdata)
		goto err;

	rdata->ops = &fc_lport_rport_ops;
	fc_rport_login(rdata);
	return;

err:
	fc_lport_error(lport, NULL);
}

/**
 * fc_lport_enter_ms() - management server commands
 * @lport: Fibre Channel local port to register
 */
static void fc_lport_enter_ms(struct fc_lport *lport, enum fc_lport_state state)
{
	struct fc_frame *fp;
	enum fc_fdmi_req cmd;
	int size = sizeof(struct fc_ct_hdr);
	size_t len;
	int numattrs;

	lockdep_assert_held(&lport->lp_mutex);

	FC_LPORT_DBG(lport, "Entered %s state from %s state\n",
		     fc_lport_state_names[state],
		     fc_lport_state(lport));

	fc_lport_state_enter(lport, state);

	switch (state) {
	case LPORT_ST_RHBA:
		cmd = FC_FDMI_RHBA;
		/* Number of HBA Attributes */
		numattrs = 10;
		len = sizeof(struct fc_fdmi_rhba);
		len -= sizeof(struct fc_fdmi_attr_entry);
		len += (numattrs * FC_FDMI_ATTR_ENTRY_HEADER_LEN);
		len += FC_FDMI_HBA_ATTR_NODENAME_LEN;
		len += FC_FDMI_HBA_ATTR_MANUFACTURER_LEN;
		len += FC_FDMI_HBA_ATTR_SERIALNUMBER_LEN;
		len += FC_FDMI_HBA_ATTR_MODEL_LEN;
		len += FC_FDMI_HBA_ATTR_MODELDESCR_LEN;
		len += FC_FDMI_HBA_ATTR_HARDWAREVERSION_LEN;
		len += FC_FDMI_HBA_ATTR_DRIVERVERSION_LEN;
		len += FC_FDMI_HBA_ATTR_OPTIONROMVERSION_LEN;
		len += FC_FDMI_HBA_ATTR_FIRMWAREVERSION_LEN;
		len += FC_FDMI_HBA_ATTR_OSNAMEVERSION_LEN;

		size += len;
		break;
	case LPORT_ST_RPA:
		cmd = FC_FDMI_RPA;
		/* Number of Port Attributes */
		numattrs = 6;
		len = sizeof(struct fc_fdmi_rpa);
		len -= sizeof(struct fc_fdmi_attr_entry);
		len += (numattrs * FC_FDMI_ATTR_ENTRY_HEADER_LEN);
		len += FC_FDMI_PORT_ATTR_FC4TYPES_LEN;
		len += FC_FDMI_PORT_ATTR_SUPPORTEDSPEED_LEN;
		len += FC_FDMI_PORT_ATTR_CURRENTPORTSPEED_LEN;
		len += FC_FDMI_PORT_ATTR_MAXFRAMESIZE_LEN;
		len += FC_FDMI_PORT_ATTR_OSDEVICENAME_LEN;
		len += FC_FDMI_PORT_ATTR_HOSTNAME_LEN;

		size += len;
		break;
	case LPORT_ST_DPRT:
		cmd = FC_FDMI_DPRT;
		len = sizeof(struct fc_fdmi_dprt);
		size += len;
		break;
	case LPORT_ST_DHBA:
		cmd = FC_FDMI_DHBA;
		len = sizeof(struct fc_fdmi_dhba);
		size += len;
		break;
	default:
		fc_lport_error(lport, NULL);
		return;
	}

	FC_LPORT_DBG(lport, "Cmd=0x%x Len %d size %d\n",
			     cmd, (int)len, size);
	fp = fc_frame_alloc(lport, size);
	if (!fp) {
		fc_lport_error(lport, fp);
		return;
	}

	if (!lport->tt.elsct_send(lport, FC_FID_MGMT_SERV, fp, cmd,
				  fc_lport_ms_resp,
				  lport, 3 * lport->r_a_tov))
		fc_lport_error(lport, fp);
}

/**
 * fc_rport_enter_fdmi() - Create a fc_rport for the management server
 * @lport: The local port requesting a remote port for the management server
 */
static void fc_lport_enter_fdmi(struct fc_lport *lport)
{
	struct fc_rport_priv *rdata;

	lockdep_assert_held(&lport->lp_mutex);

	FC_LPORT_DBG(lport, "Entered FDMI state from %s state\n",
		     fc_lport_state(lport));

	fc_lport_state_enter(lport, LPORT_ST_FDMI);

	mutex_lock(&lport->disc.disc_mutex);
	rdata = fc_rport_create(lport, FC_FID_MGMT_SERV);
	mutex_unlock(&lport->disc.disc_mutex);
	if (!rdata)
		goto err;

	rdata->ops = &fc_lport_rport_ops;
	fc_rport_login(rdata);
	return;

err:
	fc_lport_error(lport, NULL);
}

/**
 * fc_lport_timeout() - Handler for the retry_work timer
 * @work: The work struct of the local port
 */
static void fc_lport_timeout(struct work_struct *work)
{
	struct fc_lport *lport =
		container_of(work, struct fc_lport,
			     retry_work.work);

	mutex_lock(&lport->lp_mutex);

	switch (lport->state) {
	case LPORT_ST_DISABLED:
		break;
	case LPORT_ST_READY:
		break;
	case LPORT_ST_RESET:
		break;
	case LPORT_ST_FLOGI:
		fc_lport_enter_flogi(lport);
		break;
	case LPORT_ST_DNS:
		fc_lport_enter_dns(lport);
		break;
	case LPORT_ST_RNN_ID:
	case LPORT_ST_RSNN_NN:
	case LPORT_ST_RSPN_ID:
	case LPORT_ST_RFT_ID:
	case LPORT_ST_RFF_ID:
		fc_lport_enter_ns(lport, lport->state);
		break;
	case LPORT_ST_FDMI:
		fc_lport_enter_fdmi(lport);
		break;
	case LPORT_ST_RHBA:
	case LPORT_ST_RPA:
	case LPORT_ST_DHBA:
	case LPORT_ST_DPRT:
		FC_LPORT_DBG(lport, "Skipping lport state %s to SCR\n",
			     fc_lport_state(lport));
		/* fall thru */
	case LPORT_ST_SCR:
		fc_lport_enter_scr(lport);
		break;
	case LPORT_ST_LOGO:
		fc_lport_enter_logo(lport);
		break;
	}

	mutex_unlock(&lport->lp_mutex);
}

/**
 * fc_lport_logo_resp() - Handle response to LOGO request
 * @sp:	    The sequence that the LOGO was on
 * @fp:	    The LOGO frame
 * @lp_arg: The lport port that received the LOGO request
 *
 * Locking Note: This function will be called without the lport lock
 * held, but it will lock, call an _enter_* function or fc_lport_error()
 * and then unlock the lport.
 */
void fc_lport_logo_resp(struct fc_seq *sp, struct fc_frame *fp,
			void *lp_arg)
{
	struct fc_lport *lport = lp_arg;
	u8 op;

	FC_LPORT_DBG(lport, "Received a LOGO %s\n", fc_els_resp_type(fp));

	if (fp == ERR_PTR(-FC_EX_CLOSED))
		return;

	mutex_lock(&lport->lp_mutex);

	if (lport->state != LPORT_ST_LOGO) {
		FC_LPORT_DBG(lport, "Received a LOGO response, but in state "
			     "%s\n", fc_lport_state(lport));
		if (IS_ERR(fp))
			goto err;
		goto out;
	}

	if (IS_ERR(fp)) {
		fc_lport_error(lport, fp);
		goto err;
	}

	op = fc_frame_payload_op(fp);
	if (op == ELS_LS_ACC)
		fc_lport_enter_disabled(lport);
	else
		fc_lport_error(lport, fp);

out:
	fc_frame_free(fp);
err:
	mutex_unlock(&lport->lp_mutex);
}
EXPORT_SYMBOL(fc_lport_logo_resp);

/**
 * fc_rport_enter_logo() - Logout of the fabric
 * @lport: The local port to be logged out
 */
static void fc_lport_enter_logo(struct fc_lport *lport)
{
	struct fc_frame *fp;
	struct fc_els_logo *logo;

	lockdep_assert_held(&lport->lp_mutex);

	FC_LPORT_DBG(lport, "Entered LOGO state from %s state\n",
		     fc_lport_state(lport));

	fc_lport_state_enter(lport, LPORT_ST_LOGO);
	fc_vports_linkchange(lport);

	fp = fc_frame_alloc(lport, sizeof(*logo));
	if (!fp) {
		fc_lport_error(lport, fp);
		return;
	}

	if (!lport->tt.elsct_send(lport, FC_FID_FLOGI, fp, ELS_LOGO,
				  fc_lport_logo_resp, lport,
				  2 * lport->r_a_tov))
		fc_lport_error(lport, NULL);
}

/**
 * fc_lport_flogi_resp() - Handle response to FLOGI request
 * @sp:	    The sequence that the FLOGI was on
 * @fp:	    The FLOGI response frame
 * @lp_arg: The lport port that received the FLOGI response
 *
 * Locking Note: This function will be called without the lport lock
 * held, but it will lock, call an _enter_* function or fc_lport_error()
 * and then unlock the lport.
 */
void fc_lport_flogi_resp(struct fc_seq *sp, struct fc_frame *fp,
			 void *lp_arg)
{
	struct fc_lport *lport = lp_arg;
	struct fc_frame_header *fh;
	struct fc_els_flogi *flp;
	u32 did;
	u16 csp_flags;
	unsigned int r_a_tov;
	unsigned int e_d_tov;
	u16 mfs;

	FC_LPORT_DBG(lport, "Received a FLOGI %s\n", fc_els_resp_type(fp));

	if (fp == ERR_PTR(-FC_EX_CLOSED))
		return;

	mutex_lock(&lport->lp_mutex);

	if (lport->state != LPORT_ST_FLOGI) {
		FC_LPORT_DBG(lport, "Received a FLOGI response, but in state "
			     "%s\n", fc_lport_state(lport));
		if (IS_ERR(fp))
			goto err;
		goto out;
	}

	if (IS_ERR(fp)) {
		fc_lport_error(lport, fp);
		goto err;
	}

	fh = fc_frame_header_get(fp);
	did = fc_frame_did(fp);
	if (fh->fh_r_ctl != FC_RCTL_ELS_REP || did == 0 ||
	    fc_frame_payload_op(fp) != ELS_LS_ACC) {
		FC_LPORT_DBG(lport, "FLOGI not accepted or bad response\n");
		fc_lport_error(lport, fp);
		goto out;
	}

	flp = fc_frame_payload_get(fp, sizeof(*flp));
	if (!flp) {
		FC_LPORT_DBG(lport, "FLOGI bad response\n");
		fc_lport_error(lport, fp);
		goto out;
	}

	mfs = ntohs(flp->fl_csp.sp_bb_data) &
		FC_SP_BB_DATA_MASK;

	if (mfs < FC_SP_MIN_MAX_PAYLOAD || mfs > FC_SP_MAX_MAX_PAYLOAD) {
		FC_LPORT_DBG(lport, "FLOGI bad mfs:%hu response, "
			     "lport->mfs:%hu\n", mfs, lport->mfs);
		fc_lport_error(lport, fp);
		goto out;
	}

	if (mfs <= lport->mfs) {
		lport->mfs = mfs;
		fc_host_maxframe_size(lport->host) = mfs;
	}

	csp_flags = ntohs(flp->fl_csp.sp_features);
	r_a_tov = ntohl(flp->fl_csp.sp_r_a_tov);
	e_d_tov = ntohl(flp->fl_csp.sp_e_d_tov);
	if (csp_flags & FC_SP_FT_EDTR)
		e_d_tov /= 1000000;

	lport->npiv_enabled = !!(csp_flags & FC_SP_FT_NPIV_ACC);

	if ((csp_flags & FC_SP_FT_FPORT) == 0) {
		if (e_d_tov > lport->e_d_tov)
			lport->e_d_tov = e_d_tov;
		lport->r_a_tov = 2 * lport->e_d_tov;
		fc_lport_set_port_id(lport, did, fp);
		printk(KERN_INFO "host%d: libfc: "
		       "Port (%6.6x) entered "
		       "point-to-point mode\n",
		       lport->host->host_no, did);
		fc_lport_ptp_setup(lport, fc_frame_sid(fp),
				   get_unaligned_be64(
					   &flp->fl_wwpn),
				   get_unaligned_be64(
					   &flp->fl_wwnn));
	} else {
		if (e_d_tov > lport->e_d_tov)
			lport->e_d_tov = e_d_tov;
		if (r_a_tov > lport->r_a_tov)
			lport->r_a_tov = r_a_tov;
		fc_host_fabric_name(lport->host) =
			get_unaligned_be64(&flp->fl_wwnn);
		fc_lport_set_port_id(lport, did, fp);
		fc_lport_enter_dns(lport);
	}

out:
	fc_frame_free(fp);
err:
	mutex_unlock(&lport->lp_mutex);
}
EXPORT_SYMBOL(fc_lport_flogi_resp);

/**
 * fc_rport_enter_flogi() - Send a FLOGI request to the fabric manager
 * @lport: Fibre Channel local port to be logged in to the fabric
 */
static void fc_lport_enter_flogi(struct fc_lport *lport)
{
	struct fc_frame *fp;

	lockdep_assert_held(&lport->lp_mutex);

	FC_LPORT_DBG(lport, "Entered FLOGI state from %s state\n",
		     fc_lport_state(lport));

	fc_lport_state_enter(lport, LPORT_ST_FLOGI);

	if (lport->point_to_multipoint) {
		if (lport->port_id)
			fc_lport_enter_ready(lport);
		return;
	}

	fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi));
	if (!fp)
		return fc_lport_error(lport, fp);

	if (!lport->tt.elsct_send(lport, FC_FID_FLOGI, fp,
				  lport->vport ? ELS_FDISC : ELS_FLOGI,
				  fc_lport_flogi_resp, lport,
				  lport->vport ? 2 * lport->r_a_tov :
				  lport->e_d_tov))
		fc_lport_error(lport, NULL);
}

/**
 * fc_lport_config() - Configure a fc_lport
 * @lport: The local port to be configured
 */
int fc_lport_config(struct fc_lport *lport)
{
	INIT_DELAYED_WORK(&lport->retry_work, fc_lport_timeout);
	mutex_init(&lport->lp_mutex);

	fc_lport_state_enter(lport, LPORT_ST_DISABLED);

	fc_lport_add_fc4_type(lport, FC_TYPE_FCP);
	fc_lport_add_fc4_type(lport, FC_TYPE_CT);
	fc_fc4_conf_lport_params(lport, FC_TYPE_FCP);

	return 0;
}
EXPORT_SYMBOL(fc_lport_config);

/**
 * fc_lport_init() - Initialize the lport layer for a local port
 * @lport: The local port to initialize the exchange layer for
 */
int fc_lport_init(struct fc_lport *lport)
{
	fc_host_port_type(lport->host) = FC_PORTTYPE_NPORT;
	fc_host_node_name(lport->host) = lport->wwnn;
	fc_host_port_name(lport->host) = lport->wwpn;
	fc_host_supported_classes(lport->host) = FC_COS_CLASS3;
	memset(fc_host_supported_fc4s(lport->host), 0,
	       sizeof(fc_host_supported_fc4s(lport->host)));
	fc_host_supported_fc4s(lport->host)[2] = 1;
	fc_host_supported_fc4s(lport->host)[7] = 1;

	/* This value is also unchanging */
	memset(fc_host_active_fc4s(lport->host), 0,
	       sizeof(fc_host_active_fc4s(lport->host)));
	fc_host_active_fc4s(lport->host)[2] = 1;
	fc_host_active_fc4s(lport->host)[7] = 1;
	fc_host_maxframe_size(lport->host) = lport->mfs;
	fc_host_supported_speeds(lport->host) = 0;
	if (lport->link_supported_speeds & FC_PORTSPEED_1GBIT)
		fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_1GBIT;
	if (lport->link_supported_speeds & FC_PORTSPEED_10GBIT)
		fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_10GBIT;
	fc_fc4_add_lport(lport);

	return 0;
}
EXPORT_SYMBOL(fc_lport_init);

/**
 * fc_lport_bsg_resp() - The common response handler for FC Passthrough requests
 * @sp:	      The sequence for the FC Passthrough response
 * @fp:	      The response frame
 * @info_arg: The BSG info that the response is for
 */
static void fc_lport_bsg_resp(struct fc_seq *sp, struct fc_frame *fp,
			      void *info_arg)
{
	struct fc_bsg_info *info = info_arg;
	struct bsg_job *job = info->job;
	struct fc_bsg_reply *bsg_reply = job->reply;
	struct fc_lport *lport = info->lport;
	struct fc_frame_header *fh;
	size_t len;
	void *buf;

	if (IS_ERR(fp)) {
		bsg_reply->result = (PTR_ERR(fp) == -FC_EX_CLOSED) ?
			-ECONNABORTED : -ETIMEDOUT;
		job->reply_len = sizeof(uint32_t);
		bsg_job_done(job, bsg_reply->result,
			       bsg_reply->reply_payload_rcv_len);
		kfree(info);
		return;
	}

	mutex_lock(&lport->lp_mutex);
	fh = fc_frame_header_get(fp);
	len = fr_len(fp) - sizeof(*fh);
	buf = fc_frame_payload_get(fp, 0);

	if (fr_sof(fp) == FC_SOF_I3 && !ntohs(fh->fh_seq_cnt)) {
		/* Get the response code from the first frame payload */
		unsigned short cmd = (info->rsp_code == FC_FS_ACC) ?
			ntohs(((struct fc_ct_hdr *)buf)->ct_cmd) :
			(unsigned short)fc_frame_payload_op(fp);

		/* Save the reply status of the job */
		bsg_reply->reply_data.ctels_reply.status =
			(cmd == info->rsp_code) ?
			FC_CTELS_STATUS_OK : FC_CTELS_STATUS_REJECT;
	}

	bsg_reply->reply_payload_rcv_len +=
		fc_copy_buffer_to_sglist(buf, len, info->sg, &info->nents,
					 &info->offset, NULL);

	if (fr_eof(fp) == FC_EOF_T &&
	    (ntoh24(fh->fh_f_ctl) & (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) ==
	    (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) {
		if (bsg_reply->reply_payload_rcv_len >
		    job->reply_payload.payload_len)
			bsg_reply->reply_payload_rcv_len =
				job->reply_payload.payload_len;
		bsg_reply->result = 0;
		bsg_job_done(job, bsg_reply->result,
			       bsg_reply->reply_payload_rcv_len);
		kfree(info);
	}
	fc_frame_free(fp);
	mutex_unlock(&lport->lp_mutex);
}

/**
 * fc_lport_els_request() - Send ELS passthrough request
 * @job:   The BSG Passthrough job
 * @lport: The local port sending the request
 * @did:   The destination port id
 */
static int fc_lport_els_request(struct bsg_job *job,
				struct fc_lport *lport,
				u32 did, u32 tov)
{
	struct fc_bsg_info *info;
	struct fc_frame *fp;
	struct fc_frame_header *fh;
	char *pp;
	int len;

	lockdep_assert_held(&lport->lp_mutex);

	fp = fc_frame_alloc(lport, job->request_payload.payload_len);
	if (!fp)
		return -ENOMEM;

	len = job->request_payload.payload_len;
	pp = fc_frame_payload_get(fp, len);

	sg_copy_to_buffer(job->request_payload.sg_list,
			  job->request_payload.sg_cnt,
			  pp, len);

	fh = fc_frame_header_get(fp);
	fh->fh_r_ctl = FC_RCTL_ELS_REQ;
	hton24(fh->fh_d_id, did);
	hton24(fh->fh_s_id, lport->port_id);
	fh->fh_type = FC_TYPE_ELS;
	hton24(fh->fh_f_ctl, FC_FCTL_REQ);
	fh->fh_cs_ctl = 0;
	fh->fh_df_ctl = 0;
	fh->fh_parm_offset = 0;

	info = kzalloc(sizeof(struct fc_bsg_info), GFP_KERNEL);
	if (!info) {
		fc_frame_free(fp);
		return -ENOMEM;
	}

	info->job = job;
	info->lport = lport;
	info->rsp_code = ELS_LS_ACC;
	info->nents = job->reply_payload.sg_cnt;
	info->sg = job->reply_payload.sg_list;

	if (!fc_exch_seq_send(lport, fp, fc_lport_bsg_resp,
			      NULL, info, tov)) {
		kfree(info);
		return -ECOMM;
	}
	return 0;
}

/**
 * fc_lport_ct_request() - Send CT Passthrough request
 * @job:   The BSG Passthrough job
 * @lport: The local port sending the request
 * @did:   The destination FC-ID
 * @tov:   The timeout period to wait for the response
 */
static int fc_lport_ct_request(struct bsg_job *job,
			       struct fc_lport *lport, u32 did, u32 tov)
{
	struct fc_bsg_info *info;
	struct fc_frame *fp;
	struct fc_frame_header *fh;
	struct fc_ct_req *ct;
	size_t len;

	lockdep_assert_held(&lport->lp_mutex);

	fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) +
			    job->request_payload.payload_len);
	if (!fp)
		return -ENOMEM;

	len = job->request_payload.payload_len;
	ct = fc_frame_payload_get(fp, len);

	sg_copy_to_buffer(job->request_payload.sg_list,
			  job->request_payload.sg_cnt,
			  ct, len);

	fh = fc_frame_header_get(fp);
	fh->fh_r_ctl = FC_RCTL_DD_UNSOL_CTL;
	hton24(fh->fh_d_id, did);
	hton24(fh->fh_s_id, lport->port_id);
	fh->fh_type = FC_TYPE_CT;
	hton24(fh->fh_f_ctl, FC_FCTL_REQ);
	fh->fh_cs_ctl = 0;
	fh->fh_df_ctl = 0;
	fh->fh_parm_offset = 0;

	info = kzalloc(sizeof(struct fc_bsg_info), GFP_KERNEL);
	if (!info) {
		fc_frame_free(fp);
		return -ENOMEM;
	}

	info->job = job;
	info->lport = lport;
	info->rsp_code = FC_FS_ACC;
	info->nents = job->reply_payload.sg_cnt;
	info->sg = job->reply_payload.sg_list;

	if (!fc_exch_seq_send(lport, fp, fc_lport_bsg_resp,
			      NULL, info, tov)) {
		kfree(info);
		return -ECOMM;
	}
	return 0;
}

/**
 * fc_lport_bsg_request() - The common entry point for sending
 *			    FC Passthrough requests
 * @job: The BSG passthrough job
 */
int fc_lport_bsg_request(struct bsg_job *job)
{
	struct fc_bsg_request *bsg_request = job->request;
	struct fc_bsg_reply *bsg_reply = job->reply;
	struct Scsi_Host *shost = fc_bsg_to_shost(job);
	struct fc_lport *lport = shost_priv(shost);
	struct fc_rport *rport;
	struct fc_rport_priv *rdata;
	int rc = -EINVAL;
	u32 did, tov;

	bsg_reply->reply_payload_rcv_len = 0;

	mutex_lock(&lport->lp_mutex);

	switch (bsg_request->msgcode) {
	case FC_BSG_RPT_ELS:
		rport = fc_bsg_to_rport(job);
		if (!rport)
			break;

		rdata = rport->dd_data;
		rc = fc_lport_els_request(job, lport, rport->port_id,
					  rdata->e_d_tov);
		break;

	case FC_BSG_RPT_CT:
		rport = fc_bsg_to_rport(job);
		if (!rport)
			break;

		rdata = rport->dd_data;
		rc = fc_lport_ct_request(job, lport, rport->port_id,
					 rdata->e_d_tov);
		break;

	case FC_BSG_HST_CT:
		did = ntoh24(bsg_request->rqst_data.h_ct.port_id);
		if (did == FC_FID_DIR_SERV) {
			rdata = lport->dns_rdata;
			if (!rdata)
				break;
			tov = rdata->e_d_tov;
		} else {
			rdata = fc_rport_lookup(lport, did);
			if (!rdata)
				break;
			tov = rdata->e_d_tov;
			kref_put(&rdata->kref, fc_rport_destroy);
		}

		rc = fc_lport_ct_request(job, lport, did, tov);
		break;

	case FC_BSG_HST_ELS_NOLOGIN:
		did = ntoh24(bsg_request->rqst_data.h_els.port_id);
		rc = fc_lport_els_request(job, lport, did, lport->e_d_tov);
		break;
	}

	mutex_unlock(&lport->lp_mutex);
	return rc;
}
EXPORT_SYMBOL(fc_lport_bsg_request);