Free Electrons

Electrons Libres - Embedded Linux Experts

   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
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
/*
 *  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) 2004-2007   James Smart, Emulex Corporation
 *    Rewrite for host, target, device, and remote port attributes,
 *    statistics, and service functions...
 *    Add vports, etc
 *
 */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/bsg-lib.h>
#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 <net/netlink.h>
#include <scsi/scsi_netlink_fc.h>
#include <scsi/scsi_bsg_fc.h>
#include "scsi_priv.h"

static int fc_queue_work(struct Scsi_Host *, struct work_struct *);
static void fc_vport_sched_delete(struct work_struct *work);
static int fc_vport_setup(struct Scsi_Host *shost, int channel,
	struct device *pdev, struct fc_vport_identifiers  *ids,
	struct fc_vport **vport);
static int fc_bsg_hostadd(struct Scsi_Host *, struct fc_host_attrs *);
static int fc_bsg_rportadd(struct Scsi_Host *, struct fc_rport *);
static void fc_bsg_remove(struct request_queue *);
static void fc_bsg_goose_queue(struct fc_rport *);

/*
 * 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, uint, 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 if"
		 " fast_io_fail_tmo is not set.");

/*
 * Redefine so that we can have same named attributes in the
 * sdev/starget/host objects.
 */
#define FC_DEVICE_ATTR(_prefix,_name,_mode,_show,_store)		\
struct device_attribute 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_PORTTYPE_NPIV,		"NPIV VPORT" },
};
fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
#define FC_PORTTYPE_MAX_NAMELEN		50

/* Reuse fc_port_type enum function for vport_type */
#define get_fc_vport_type_name get_fc_port_type_name


/* 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_vport_state values to ascii string name */
static struct {
	enum fc_vport_state	value;
	char			*name;
} fc_vport_state_names[] = {
	{ FC_VPORT_UNKNOWN,		"Unknown" },
	{ FC_VPORT_ACTIVE,		"Active" },
	{ FC_VPORT_DISABLED,		"Disabled" },
	{ FC_VPORT_LINKDOWN,		"Linkdown" },
	{ FC_VPORT_INITIALIZING,	"Initializing" },
	{ FC_VPORT_NO_FABRIC_SUPP,	"No Fabric Support" },
	{ FC_VPORT_NO_FABRIC_RSCS,	"No Fabric Resources" },
	{ FC_VPORT_FABRIC_LOGOUT,	"Fabric Logout" },
	{ FC_VPORT_FABRIC_REJ_WWN,	"Fabric Rejected WWN" },
	{ FC_VPORT_FAILED,		"VPort Failed" },
};
fc_enum_name_search(vport_state, fc_vport_state, fc_vport_state_names)
#define FC_VPORTSTATE_MAX_NAMELEN	24

/* Reuse fc_vport_state enum function for vport_last_state */
#define get_fc_vport_last_state_name get_fc_vport_state_name


/* 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_8GBIT,		"8 Gbit" },
	{ FC_PORTSPEED_16GBIT,		"16 Gbit" },
	{ FC_PORTSPEED_32GBIT,		"32 Gbit" },
	{ FC_PORTSPEED_20GBIT,		"20 Gbit" },
	{ FC_PORTSPEED_40GBIT,		"40 Gbit" },
	{ FC_PORTSPEED_50GBIT,		"50 Gbit" },
	{ FC_PORTSPEED_100GBIT,		"100 Gbit" },
	{ FC_PORTSPEED_25GBIT,		"25 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_PORT_ROLE bit values to ascii string name */
static const struct {
	u32 			value;
	char			*name;
} fc_port_role_names[] = {
	{ FC_PORT_ROLE_FCP_TARGET,		"FCP Target" },
	{ FC_PORT_ROLE_FCP_INITIATOR,		"FCP Initiator" },
	{ FC_PORT_ROLE_IP_PORT,			"IP Port" },
	{ FC_PORT_ROLE_FCP_DUMMY_INITIATOR,	"FCP Dummy Initiator" },
};
fc_bitfield_name_search(port_roles, fc_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_VPORT_NUM_ATTRS	9
#define FC_HOST_NUM_ATTRS	29

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 device_attribute private_starget_attrs[
							FC_STARGET_NUM_ATTRS];
	struct device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];

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

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

	struct transport_container vport_attr_cont;
	struct device_attribute private_vport_attrs[FC_VPORT_NUM_ATTRS];
	struct device_attribute *vport_attrs[FC_VPORT_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 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 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;
	fc_host->max_npiv_vports = 0;
	memset(fc_host->serial_number, 0,
		sizeof(fc_host->serial_number));
	memset(fc_host->manufacturer, 0,
		sizeof(fc_host->manufacturer));
	memset(fc_host->model, 0,
		sizeof(fc_host->model));
	memset(fc_host->model_description, 0,
		sizeof(fc_host->model_description));
	memset(fc_host->hardware_version, 0,
		sizeof(fc_host->hardware_version));
	memset(fc_host->driver_version, 0,
		sizeof(fc_host->driver_version));
	memset(fc_host->firmware_version, 0,
		sizeof(fc_host->firmware_version));
	memset(fc_host->optionrom_version, 0,
		sizeof(fc_host->optionrom_version));

	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);
	INIT_LIST_HEAD(&fc_host->vports);
	fc_host->next_rport_number = 0;
	fc_host->next_target_id = 0;
	fc_host->next_vport_number = 0;
	fc_host->npiv_vports_inuse = 0;

	snprintf(fc_host->work_q_name, sizeof(fc_host->work_q_name),
		 "fc_wq_%d", shost->host_no);
	fc_host->work_q = alloc_workqueue("%s", 0, 0, fc_host->work_q_name);
	if (!fc_host->work_q)
		return -ENOMEM;

	fc_host->dev_loss_tmo = fc_dev_loss_tmo;
	snprintf(fc_host->devloss_work_q_name,
		 sizeof(fc_host->devloss_work_q_name),
		 "fc_dl_%d", shost->host_no);
	fc_host->devloss_work_q = alloc_workqueue("%s", 0, 0,
					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;
	}

	fc_bsg_hostadd(shost, fc_host);
	/* ignore any bsg add error - we just can't do sgio */

	return 0;
}

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

	fc_bsg_remove(fc_host->rqst_q);
	return 0;
}

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

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

/*
 * Netlink Infrastructure
 */

static atomic_t fc_event_seq;

/**
 * fc_get_event_number - Obtain the next sequential FC event number
 *
 * Notes:
 *   We could have inlined 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;
	int err;

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

	len = FC_NL_MSGALIGN(sizeof(*event));

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

	nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG, len, 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;

	nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
			GFP_KERNEL);
	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",
		__func__, 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 an 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
 * @vendor_id:          Vendor id
 *
 * 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;
	int err;

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

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

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

	nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG, len, 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);

	nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
			GFP_KERNEL);
	return;

send_vendor_fail_skb:
	kfree_skb(skb);
send_vendor_fail:
	printk(KERN_WARNING
		"%s: Dropped Event : host %d vendor_unique - err %d\n",
		__func__, 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_vport_class);
	if (error)
		goto unreg_host_class;
	error = transport_class_register(&fc_rport_class);
	if (error)
		goto unreg_vport_class;
	error = transport_class_register(&fc_transport_class);
	if (error)
		goto unreg_rport_class;
	return 0;

unreg_rport_class:
	transport_class_unregister(&fc_rport_class);
unreg_vport_class:
	transport_class_unregister(&fc_vport_class);
unreg_host_class:
	transport_class_unregister(&fc_host_class);
	return error;
}

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);
	transport_class_unregister(&fc_vport_class);
}

/*
 * FC Remote Port Attribute Management
 */

#define fc_rport_show_function(field, format_string, sz, cast)		\
static ssize_t								\
show_fc_rport_##field (struct device *dev, 				\
		       struct device_attribute *attr, char *buf)	\
{									\
	struct fc_rport *rport = transport_class_to_rport(dev);		\
	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 device *dev,				\
		       struct device_attribute *attr,			\
		       const char *buf,	size_t count)			\
{									\
	int val;							\
	struct fc_rport *rport = transport_class_to_rport(dev);		\
	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_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_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_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 device *dev, 				\
		       struct device_attribute *attr, char *buf)	\
{									\
	struct fc_rport *rport = transport_class_to_rport(dev);		\
	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_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_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 device *dev,				\
		       struct device_attribute *attr, char *buf)	\
{									\
	struct fc_rport *rport = transport_class_to_rport(dev);		\
	const char *name;						\
	name = get_fc_##title##_name(rport->title);			\
	if (!name)							\
		return -EINVAL;						\
	return snprintf(buf, maxlen, "%s\n", name);			\
}									\
static FC_DEVICE_ATTR(rport, title, S_IRUGO,			\
			show_fc_rport_##title, NULL)


#define SETUP_RPORT_ATTRIBUTE_RD(field)					\
	i->private_rport_attrs[count] = 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] = 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] = 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] = 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 device *dev,
				 struct device_attribute *attr, char *buf)
{
	struct fc_rport *rport = transport_class_to_rport(dev);
	if (rport->supported_classes == FC_COS_UNSPECIFIED)
		return snprintf(buf, 20, "unspecified\n");
	return get_fc_cos_names(rport->supported_classes, buf);
}
static FC_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
		show_fc_rport_supported_classes, NULL);

/* Dynamic Remote Port Attributes */

/*
 * dev_loss_tmo attribute
 */
static int fc_str_to_dev_loss(const char *buf, unsigned long *val)
{
	char *cp;

	*val = simple_strtoul(buf, &cp, 0);
	if (*cp && (*cp != '\n'))
		return -EINVAL;
	/*
	 * Check for overflow; dev_loss_tmo is u32
	 */
	if (*val > UINT_MAX)
		return -EINVAL;

	return 0;
}

static int fc_rport_set_dev_loss_tmo(struct fc_rport *rport,
				     unsigned long val)
{
	struct Scsi_Host *shost = rport_to_shost(rport);
	struct fc_internal *i = to_fc_internal(shost->transportt);

	if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
	    (rport->port_state == FC_PORTSTATE_DELETED) ||
	    (rport->port_state == FC_PORTSTATE_NOTPRESENT))
		return -EBUSY;
	/*
	 * Check for overflow; dev_loss_tmo is u32
	 */
	if (val > UINT_MAX)
		return -EINVAL;

	/*
	 * If fast_io_fail is off we have to cap
	 * dev_loss_tmo at SCSI_DEVICE_BLOCK_MAX_TIMEOUT
	 */
	if (rport->fast_io_fail_tmo == -1 &&
	    val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
		return -EINVAL;

	i->f->set_rport_dev_loss_tmo(rport, val);
	return 0;
}

fc_rport_show_function(dev_loss_tmo, "%d\n", 20, )
static ssize_t
store_fc_rport_dev_loss_tmo(struct device *dev, struct device_attribute *attr,
			    const char *buf, size_t count)
{
	struct fc_rport *rport = transport_class_to_rport(dev);
	unsigned long val;
	int rc;

	rc = fc_str_to_dev_loss(buf, &val);
	if (rc)
		return rc;

	rc = fc_rport_set_dev_loss_tmo(rport, val);
	if (rc)
		return rc;
	return count;
}
static FC_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 device *dev, struct device_attribute *attr,
		     char *buf)
{
	struct fc_rport *rport = transport_class_to_rport(dev);

	/* 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_PORT_ROLE_UNKNOWN)
			return snprintf(buf, 20, "unknown\n");
		return get_fc_port_roles_names(rport->roles, buf);
	}
}
static FC_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 device *dev,
				struct device_attribute *attr, char *buf)
{
	struct fc_rport *rport = transport_class_to_rport(dev);

	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 device *dev,
				struct device_attribute *attr, const char *buf,
				size_t count)
{
	int val;
	char *cp;
	struct fc_rport *rport = transport_class_to_rport(dev);

	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))
			return -EINVAL;
		/*
		 * Cap fast_io_fail by dev_loss_tmo or
		 * SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
		 */
		if ((val >= rport->dev_loss_tmo) ||
		    (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
			return -EINVAL;

		rport->fast_io_fail_tmo = val;
	}
	return count;
}
static FC_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 hierarchy 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 device *dev, 				\
			 struct device_attribute *attr, char *buf)	\
{									\
	struct scsi_target *starget = transport_class_to_starget(dev);	\
	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_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_DEVICE_ATTR(starget, field, S_IRUGO,			\
			  show_fc_starget_##field, NULL)

#define SETUP_STARGET_ATTRIBUTE_RD(field)				\
	i->private_starget_attrs[count] = 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] = 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);


/*
 * FC Virtual Port Attribute Management
 */

#define fc_vport_show_function(field, format_string, sz, cast)		\
static ssize_t								\
show_fc_vport_##field (struct device *dev, 				\
		       struct device_attribute *attr, char *buf)	\
{									\
	struct fc_vport *vport = transport_class_to_vport(dev);		\
	struct Scsi_Host *shost = vport_to_shost(vport);		\
	struct fc_internal *i = to_fc_internal(shost->transportt);	\
	if ((i->f->get_vport_##field) &&				\
	    !(vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)))	\
		i->f->get_vport_##field(vport);				\
	return snprintf(buf, sz, format_string, cast vport->field); 	\
}

#define fc_vport_store_function(field)					\
static ssize_t								\
store_fc_vport_##field(struct device *dev,				\
		       struct device_attribute *attr,			\
		       const char *buf,	size_t count)			\
{									\
	int val;							\
	struct fc_vport *vport = transport_class_to_vport(dev);		\
	struct Scsi_Host *shost = vport_to_shost(vport);		\
	struct fc_internal *i = to_fc_internal(shost->transportt);	\
	char *cp;							\
	if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))	\
		return -EBUSY;						\
	val = simple_strtoul(buf, &cp, 0);				\
	if (*cp && (*cp != '\n'))					\
		return -EINVAL;						\
	i->f->set_vport_##field(vport, val);				\
	return count;							\
}

#define fc_vport_store_str_function(field, slen)			\
static ssize_t								\
store_fc_vport_##field(struct device *dev,				\
		       struct device_attribute *attr, 			\
		       const char *buf,	size_t count)			\
{									\
	struct fc_vport *vport = transport_class_to_vport(dev);		\
	struct Scsi_Host *shost = vport_to_shost(vport);		\
	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(vport->field, buf, cnt);					\
	i->f->set_vport_##field(vport);					\
	return count;							\
}

#define fc_vport_rd_attr(field, format_string, sz)			\
	fc_vport_show_function(field, format_string, sz, )		\
static FC_DEVICE_ATTR(vport, field, S_IRUGO,			\
			 show_fc_vport_##field, NULL)

#define fc_vport_rd_attr_cast(field, format_string, sz, cast)		\
	fc_vport_show_function(field, format_string, sz, (cast))	\
static FC_DEVICE_ATTR(vport, field, S_IRUGO,			\
			  show_fc_vport_##field, NULL)

#define fc_vport_rw_attr(field, format_string, sz)			\
	fc_vport_show_function(field, format_string, sz, )		\
	fc_vport_store_function(field)					\
static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR,		\
			show_fc_vport_##field,				\
			store_fc_vport_##field)

#define fc_private_vport_show_function(field, format_string, sz, cast)	\
static ssize_t								\
show_fc_vport_##field (struct device *dev,				\
		       struct device_attribute *attr, char *buf)	\
{									\
	struct fc_vport *vport = transport_class_to_vport(dev);		\
	return snprintf(buf, sz, format_string, cast vport->field); 	\
}

#define fc_private_vport_store_u32_function(field)			\
static ssize_t								\
store_fc_vport_##field(struct device *dev,				\
		       struct device_attribute *attr,			\
		       const char *buf,	size_t count)			\
{									\
	u32 val;							\
	struct fc_vport *vport = transport_class_to_vport(dev);		\
	char *cp;							\
	if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))		\
		return -EBUSY;						\
	val = simple_strtoul(buf, &cp, 0);				\
	if (*cp && (*cp != '\n'))					\
		return -EINVAL;						\
	vport->field = val;						\
	return count;							\
}


#define fc_private_vport_rd_attr(field, format_string, sz)		\
	fc_private_vport_show_function(field, format_string, sz, )	\
static FC_DEVICE_ATTR(vport, field, S_IRUGO,			\
			 show_fc_vport_##field, NULL)

#define fc_private_vport_rd_attr_cast(field, format_string, sz, cast)	\
	fc_private_vport_show_function(field, format_string, sz, (cast)) \
static FC_DEVICE_ATTR(vport, field, S_IRUGO,			\
			  show_fc_vport_##field, NULL)

#define fc_private_vport_rw_u32_attr(field, format_string, sz)		\
	fc_private_vport_show_function(field, format_string, sz, )	\
	fc_private_vport_store_u32_function(field)			\
static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR,		\
			show_fc_vport_##field,				\
			store_fc_vport_##field)


#define fc_private_vport_rd_enum_attr(title, maxlen)			\
static ssize_t								\
show_fc_vport_##title (struct device *dev,				\
		       struct device_attribute *attr,			\
		       char *buf)					\
{									\
	struct fc_vport *vport = transport_class_to_vport(dev);		\
	const char *name;						\
	name = get_fc_##title##_name(vport->title);			\
	if (!name)							\
		return -EINVAL;						\
	return snprintf(buf, maxlen, "%s\n", name);			\
}									\
static FC_DEVICE_ATTR(vport, title, S_IRUGO,			\
			show_fc_vport_##title, NULL)


#define SETUP_VPORT_ATTRIBUTE_RD(field)					\
	i->private_vport_attrs[count] = device_attr_vport_##field; \
	i->private_vport_attrs[count].attr.mode = S_IRUGO;		\
	i->private_vport_attrs[count].store = NULL;			\
	i->vport_attrs[count] = &i->private_vport_attrs[count];		\
	if (i->f->get_##field)						\
		count++
	/* NOTE: Above MACRO differs: checks function not show bit */

#define SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(field)				\
	i->private_vport_attrs[count] = device_attr_vport_##field; \
	i->private_vport_attrs[count].attr.mode = S_IRUGO;		\
	i->private_vport_attrs[count].store = NULL;			\
	i->vport_attrs[count] = &i->private_vport_attrs[count];		\
	count++

#define SETUP_VPORT_ATTRIBUTE_WR(field)					\
	i->private_vport_attrs[count] = device_attr_vport_##field; \
	i->vport_attrs[count] = &i->private_vport_attrs[count];		\
	if (i->f->field)						\
		count++
	/* NOTE: Above MACRO differs: checks function */

#define SETUP_VPORT_ATTRIBUTE_RW(field)					\
	i->private_vport_attrs[count] = device_attr_vport_##field; \
	if (!i->f->set_vport_##field) {					\
		i->private_vport_attrs[count].attr.mode = S_IRUGO;	\
		i->private_vport_attrs[count].store = NULL;		\
	}								\
	i->vport_attrs[count] = &i->private_vport_attrs[count];		\
	count++
	/* NOTE: Above MACRO differs: does not check show bit */

#define SETUP_PRIVATE_VPORT_ATTRIBUTE_RW(field)				\
{									\
	i->private_vport_attrs[count] = device_attr_vport_##field; \
	i->vport_attrs[count] = &i->private_vport_attrs[count];		\
	count++;							\
}


/* The FC Transport Virtual Port Attributes: */

/* Fixed Virtual Port Attributes */

/* Dynamic Virtual Port Attributes */

/* Private Virtual Port Attributes */

fc_private_vport_rd_enum_attr(vport_state, FC_VPORTSTATE_MAX_NAMELEN);
fc_private_vport_rd_enum_attr(vport_last_state, FC_VPORTSTATE_MAX_NAMELEN);
fc_private_vport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
fc_private_vport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);

static ssize_t
show_fc_vport_roles (struct device *dev, struct device_attribute *attr,
		     char *buf)
{
	struct fc_vport *vport = transport_class_to_vport(dev);

	if (vport->roles == FC_PORT_ROLE_UNKNOWN)
		return snprintf(buf, 20, "unknown\n");
	return get_fc_port_roles_names(vport->roles, buf);
}
static FC_DEVICE_ATTR(vport, roles, S_IRUGO, show_fc_vport_roles, NULL);

fc_private_vport_rd_enum_attr(vport_type, FC_PORTTYPE_MAX_NAMELEN);

fc_private_vport_show_function(symbolic_name, "%s\n",
		FC_VPORT_SYMBOLIC_NAMELEN + 1, )
fc_vport_store_str_function(symbolic_name, FC_VPORT_SYMBOLIC_NAMELEN)
static FC_DEVICE_ATTR(vport, symbolic_name, S_IRUGO | S_IWUSR,
		show_fc_vport_symbolic_name, store_fc_vport_symbolic_name);

static ssize_t
store_fc_vport_delete(struct device *dev, struct device_attribute *attr,
		      const char *buf, size_t count)
{
	struct fc_vport *vport = transport_class_to_vport(dev);
	struct Scsi_Host *shost = vport_to_shost(vport);
	unsigned long flags;

	spin_lock_irqsave(shost->host_lock, flags);
	if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING | FC_VPORT_DELETING)) {
		spin_unlock_irqrestore(shost->host_lock, flags);
		return -EBUSY;
	}
	vport->flags |= FC_VPORT_DELETING;
	spin_unlock_irqrestore(shost->host_lock, flags);

	fc_queue_work(shost, &vport->vport_delete_work);
	return count;
}
static FC_DEVICE_ATTR(vport, vport_delete, S_IWUSR,
			NULL, store_fc_vport_delete);


/*
 * Enable/Disable vport
 *  Write "1" to disable, write "0" to enable
 */
static ssize_t
store_fc_vport_disable(struct device *dev, struct device_attribute *attr,
		       const char *buf,
			   size_t count)
{
	struct fc_vport *vport = transport_class_to_vport(dev);
	struct Scsi_Host *shost = vport_to_shost(vport);
	struct fc_internal *i = to_fc_internal(shost->transportt);
	int stat;

	if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
		return -EBUSY;

	if (*buf == '0') {
		if (vport->vport_state != FC_VPORT_DISABLED)
			return -EALREADY;
	} else if (*buf == '1') {
		if (vport->vport_state == FC_VPORT_DISABLED)
			return -EALREADY;
	} else
		return -EINVAL;

	stat = i->f->vport_disable(vport, ((*buf == '0') ? false : true));
	return stat ? stat : count;
}
static FC_DEVICE_ATTR(vport, vport_disable, S_IWUSR,
			NULL, store_fc_vport_disable);


/*
 * Host Attribute Management
 */

#define fc_host_show_function(field, format_string, sz, cast)		\
static ssize_t								\
show_fc_host_##field (struct device *dev,				\
		      struct device_attribute *attr, char *buf)		\
{									\
	struct Scsi_Host *shost = transport_class_to_shost(dev);	\
	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 device *dev, 				\
		      struct device_attribute *attr,			\
		      const char *buf,	size_t count)			\
{									\
	int val;							\
	struct Scsi_Host *shost = transport_class_to_shost(dev);	\
	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 device *dev,				\
		      struct device_attribute *attr,			\
		      const char *buf, size_t count)			\
{									\
	struct Scsi_Host *shost = transport_class_to_shost(dev);	\
	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_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_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_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 device *dev,				\
		      struct device_attribute *attr, char *buf)		\
{									\
	struct Scsi_Host *shost = transport_class_to_shost(dev);	\
	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_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)

#define SETUP_HOST_ATTRIBUTE_RD(field)					\
	i->private_host_attrs[count] = 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_RD_NS(field)				\
	i->private_host_attrs[count] = 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_HOST_ATTRIBUTE_RW(field)					\
	i->private_host_attrs[count] = 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 device *dev,				\
		      struct device_attribute *attr, char *buf)		\
{									\
	struct Scsi_Host *shost = transport_class_to_shost(dev);	\
	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_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_DEVICE_ATTR(host, field, S_IRUGO,			\
			  show_fc_host_##field, NULL)

#define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field)			\
	i->private_host_attrs[count] = 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] = 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 device *dev,
			        struct device_attribute *attr, char *buf)
{
	struct Scsi_Host *shost = transport_class_to_shost(dev);

	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_DEVICE_ATTR(host, supported_classes, S_IRUGO,
		show_fc_host_supported_classes, NULL);

static ssize_t
show_fc_host_supported_fc4s (struct device *dev,
			     struct device_attribute *attr, char *buf)
{
	struct Scsi_Host *shost = transport_class_to_shost(dev);
	return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
}
static FC_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
		show_fc_host_supported_fc4s, NULL);

static ssize_t
show_fc_host_supported_speeds (struct device *dev,
			       struct device_attribute *attr, char *buf)
{
	struct Scsi_Host *shost = transport_class_to_shost(dev);

	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_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(max_npiv_vports, "%u\n", 20);
fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
fc_private_host_rd_attr(manufacturer, "%s\n", FC_SERIAL_NUMBER_SIZE + 1);
fc_private_host_rd_attr(model, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
fc_private_host_rd_attr(model_description, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
fc_private_host_rd_attr(hardware_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
fc_private_host_rd_attr(driver_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
fc_private_host_rd_attr(firmware_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
fc_private_host_rd_attr(optionrom_version, "%s\n", FC_VERSION_STRING_SIZE + 1);


/* Dynamic Host Attributes */

static ssize_t
show_fc_host_active_fc4s (struct device *dev,
			  struct device_attribute *attr, char *buf)
{
	struct Scsi_Host *shost = transport_class_to_shost(dev);
	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_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
		show_fc_host_active_fc4s, NULL);

static ssize_t
show_fc_host_speed (struct device *dev,
		    struct device_attribute *attr, char *buf)
{
	struct Scsi_Host *shost = transport_class_to_shost(dev);
	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_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_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 device *dev,
				     struct device_attribute *attr, char *buf)
{
	struct Scsi_Host *shost = transport_class_to_shost(dev);
	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 device *dev,
	struct device_attribute *attr, const char *buf, size_t count)
{
	struct Scsi_Host *shost = transport_class_to_shost(dev);
	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_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 device *dev,
	struct device_attribute *attr, const char *buf, size_t count)
{
	struct Scsi_Host *shost = transport_class_to_shost(dev);
	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_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
			store_fc_private_host_issue_lip);

static ssize_t
store_fc_private_host_dev_loss_tmo(struct device *dev,
				   struct device_attribute *attr,
				   const char *buf, size_t count)
{
	struct Scsi_Host *shost = transport_class_to_shost(dev);
	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
	struct fc_rport *rport;
	unsigned long val, flags;
	int rc;

	rc = fc_str_to_dev_loss(buf, &val);
	if (rc)
		return rc;

	fc_host_dev_loss_tmo(shost) = val;
	spin_lock_irqsave(shost->host_lock, flags);
	list_for_each_entry(rport, &fc_host->rports, peers)
		fc_rport_set_dev_loss_tmo(rport, val);
	spin_unlock_irqrestore(shost->host_lock, flags);
	return count;
}

fc_private_host_show_function(dev_loss_tmo, "%d\n", 20, );
static FC_DEVICE_ATTR(host, dev_loss_tmo, S_IRUGO | S_IWUSR,
		      show_fc_host_dev_loss_tmo,
		      store_fc_private_host_dev_loss_tmo);

fc_private_host_rd_attr(npiv_vports_inuse, "%u\n", 20);

/*
 * Host Statistics Management
 */

/* Show a given attribute in the statistics group */
static ssize_t
fc_stat_show(const struct device *dev, char *buf, unsigned long offset)
{
	struct Scsi_Host *shost = transport_class_to_shost(dev);
	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 device *cd,			\
				  struct device_attribute *attr,	\
				  char *buf)				\
{									\
	return fc_stat_show(cd, buf, 					\
			    offsetof(struct fc_host_statistics, name));	\
}									\
static FC_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);
fc_host_statistic(fcp_packet_alloc_failures);
fc_host_statistic(fcp_packet_aborts);
fc_host_statistic(fcp_frame_alloc_failures);
fc_host_statistic(fc_no_free_exch);
fc_host_statistic(fc_no_free_exch_xid);
fc_host_statistic(fc_xid_not_found);
fc_host_statistic(fc_xid_busy);
fc_host_statistic(fc_seq_not_found);
fc_host_statistic(fc_non_bls_resp);

static ssize_t
fc_reset_statistics(struct device *dev, struct device_attribute *attr,
		    const char *buf, size_t count)
{
	struct Scsi_Host *shost = transport_class_to_shost(dev);
	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_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
				fc_reset_statistics);

static struct attribute *fc_statistics_attrs[] = {
	&device_attr_host_seconds_since_last_reset.attr,
	&device_attr_host_tx_frames.attr,
	&device_attr_host_tx_words.attr,
	&device_attr_host_rx_frames.attr,
	&device_attr_host_rx_words.attr,
	&device_attr_host_lip_count.attr,
	&device_attr_host_nos_count.attr,
	&device_attr_host_error_frames.attr,
	&device_attr_host_dumped_frames.attr,
	&device_attr_host_link_failure_count.attr,
	&device_attr_host_loss_of_sync_count.attr,
	&device_attr_host_loss_of_signal_count.attr,
	&device_attr_host_prim_seq_protocol_err_count.attr,
	&device_attr_host_invalid_tx_word_count.attr,
	&device_attr_host_invalid_crc_count.attr,
	&device_attr_host_fcp_input_requests.attr,
	&device_attr_host_fcp_output_requests.attr,
	&device_attr_host_fcp_control_requests.attr,
	&device_attr_host_fcp_input_megabytes.attr,
	&device_attr_host_fcp_output_megabytes.attr,
	&device_attr_host_fcp_packet_alloc_failures.attr,
	&device_attr_host_fcp_packet_aborts.attr,
	&device_attr_host_fcp_frame_alloc_failures.attr,
	&device_attr_host_fc_no_free_exch.attr,
	&device_attr_host_fc_no_free_exch_xid.attr,
	&device_attr_host_fc_xid_not_found.attr,
	&device_attr_host_fc_xid_busy.attr,
	&device_attr_host_fc_seq_not_found.attr,
	&device_attr_host_fc_non_bls_resp.attr,
	&device_attr_host_reset_statistics.attr,
	NULL
};

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


/* Host Vport Attributes */

static int
fc_parse_wwn(const char *ns, u64 *nm)
{
	unsigned int i, j;
	u8 wwn[8];

	memset(wwn, 0, sizeof(wwn));

	/* Validate and store the new name */
	for (i=0, j=0; i < 16; i++) {
		int value;

		value = hex_to_bin(*ns++);
		if (value >= 0)
			j = (j << 4) | value;
		else
			return -EINVAL;
		if (i % 2) {
			wwn[i/2] = j & 0xff;
			j = 0;
		}
	}

	*nm = wwn_to_u64(wwn);

	return 0;
}


/*
 * "Short-cut" sysfs variable to create a new vport on a FC Host.
 * Input is a string of the form "<WWPN>:<WWNN>". Other attributes
 * will default to a NPIV-based FCP_Initiator; The WWNs are specified
 * as hex characters, and may *not* contain any prefixes (e.g. 0x, x, etc)
 */
static ssize_t
store_fc_host_vport_create(struct device *dev, struct device_attribute *attr,
			   const char *buf, size_t count)
{
	struct Scsi_Host *shost = transport_class_to_shost(dev);
	struct fc_vport_identifiers vid;
	struct fc_vport *vport;
	unsigned int cnt=count;
	int stat;

	memset(&vid, 0, sizeof(vid));

	/* count may include a LF at end of string */
	if (buf[cnt-1] == '\n')
		cnt--;

	/* validate we have enough characters for WWPN */
	if ((cnt != (16+1+16)) || (buf[16] != ':'))
		return -EINVAL;

	stat = fc_parse_wwn(&buf[0], &vid.port_name);
	if (stat)
		return stat;

	stat = fc_parse_wwn(&buf[17], &vid.node_name);
	if (stat)
		return stat;

	vid.roles = FC_PORT_ROLE_FCP_INITIATOR;
	vid.vport_type = FC_PORTTYPE_NPIV;
	/* vid.symbolic_name is already zero/NULL's */
	vid.disable = false;		/* always enabled */

	/* we only allow support on Channel 0 !!! */
	stat = fc_vport_setup(shost, 0, &shost->shost_gendev, &vid, &vport);
	return stat ? stat : count;
}
static FC_DEVICE_ATTR(host, vport_create, S_IWUSR, NULL,
			store_fc_host_vport_create);


/*
 * "Short-cut" sysfs variable to delete a vport on a FC Host.
 * Vport is identified by a string containing "<WWPN>:<WWNN>".
 * The WWNs are specified as hex characters, and may *not* contain
 * any prefixes (e.g. 0x, x, etc)
 */
static ssize_t
store_fc_host_vport_delete(struct device *dev, struct device_attribute *attr,
			   const char *buf, size_t count)
{
	struct Scsi_Host *shost = transport_class_to_shost(dev);
	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
	struct fc_vport *vport;
	u64 wwpn, wwnn;
	unsigned long flags;
	unsigned int cnt=count;
	int stat, match;

	/* count may include a LF at end of string */
	if (buf[cnt-1] == '\n')
		cnt--;

	/* validate we have enough characters for WWPN */
	if ((cnt != (16+1+16)) || (buf[16] != ':'))
		return -EINVAL;

	stat = fc_parse_wwn(&buf[0], &wwpn);
	if (stat)
		return stat;

	stat = fc_parse_wwn(&buf[17], &wwnn);
	if (stat)
		return stat;

	spin_lock_irqsave(shost->host_lock, flags);
	match = 0;
	/* we only allow support on Channel 0 !!! */
	list_for_each_entry(vport, &fc_host->vports, peers) {
		if ((vport->channel == 0) &&
		    (vport->port_name == wwpn) && (vport->node_name == wwnn)) {
			if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
				break;
			vport->flags |= FC_VPORT_DELETING;
			match = 1;
			break;
		}
	}
	spin_unlock_irqrestore(shost->host_lock, flags);

	if (!match)
		return -ENODEV;

	stat = fc_vport_terminate(vport);
	return stat ? stat : count;
}
static FC_DEVICE_ATTR(host, vport_delete, S_IWUSR, NULL,
			store_fc_host_vport_delete);


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;
}


static void fc_vport_dev_release(struct device *dev)
{
	struct fc_vport *vport = dev_to_vport(dev);
	put_device(dev->parent);		/* release kobj parent */
	kfree(vport);
}

static int scsi_is_fc_vport(const struct device *dev)
{
	return dev->release == fc_vport_dev_release;
}

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

	if (!scsi_is_fc_vport(dev))
		return 0;
	vport = dev_to_vport(dev);

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

	i = to_fc_internal(shost->transportt);
	return &i->vport_attr_cont.ac == cont;
}


/**
 * fc_eh_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.
 */
enum blk_eh_timer_return
fc_eh_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 BLK_EH_RESET_TIMER;

	return BLK_EH_NOT_HANDLED;
}
EXPORT_SYMBOL(fc_eh_timed_out);

/*
 * Called by fc_user_scan to locate an rport on the shost that
 * matches the channel and target id, and invoke scsi_scan_target()
 * on the rport.
 */
static void
fc_user_scan_tgt(struct Scsi_Host *shost, uint channel, uint id, u64 lun)
{
	struct fc_rport *rport;
	unsigned long flags;

	spin_lock_irqsave(shost->host_lock, flags);

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

		if (rport->port_state != FC_PORTSTATE_ONLINE)
			continue;

		if ((channel == rport->channel) &&
		    (id == rport->scsi_target_id)) {
			spin_unlock_irqrestore(shost->host_lock, flags);
			scsi_scan_target(&rport->dev, channel, id, lun,
					 SCSI_SCAN_MANUAL);
			return;
		}
	}

	spin_unlock_irqrestore(shost->host_lock, flags);
}

/*
 * Called via sysfs scan routines. Necessary, as the FC transport
 * wants to place all target objects below the rport object. So this
 * routine must invoke the scsi_scan_target() routine with the rport
 * object as the parent.
 */
static int
fc_user_scan(struct Scsi_Host *shost, uint channel, uint id, u64 lun)
{
	uint chlo, chhi;
	uint tgtlo, tgthi;

	if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
	    ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
	    ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
		return -EINVAL;

	if (channel == SCAN_WILD_CARD) {
		chlo = 0;
		chhi = shost->max_channel + 1;
	} else {
		chlo = channel;
		chhi = channel + 1;
	}

	if (id == SCAN_WILD_CARD) {
		tgtlo = 0;
		tgthi = shost->max_id;
	} else {
		tgtlo = id;
		tgthi = id + 1;
	}

	for ( ; chlo < chhi; chlo++)
		for ( ; tgtlo < tgthi; tgtlo++)
			fc_user_scan_tgt(shost, chlo, tgtlo, lun);

	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->vport_attr_cont.ac.attrs = &i->vport_attrs[0];
	i->vport_attr_cont.ac.class = &fc_vport_class.class;
	i->vport_attr_cont.ac.match = fc_vport_match;
	transport_container_register(&i->vport_attr_cont);

	i->f = ft;

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

	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);
	if (ft->vport_create) {
		SETUP_HOST_ATTRIBUTE_RD_NS(max_npiv_vports);
		SETUP_HOST_ATTRIBUTE_RD_NS(npiv_vports_inuse);
	}
	SETUP_HOST_ATTRIBUTE_RD(serial_number);
	SETUP_HOST_ATTRIBUTE_RD(manufacturer);
	SETUP_HOST_ATTRIBUTE_RD(model);
	SETUP_HOST_ATTRIBUTE_RD(model_description);
	SETUP_HOST_ATTRIBUTE_RD(hardware_version);
	SETUP_HOST_ATTRIBUTE_RD(driver_version);
	SETUP_HOST_ATTRIBUTE_RD(firmware_version);
	SETUP_HOST_ATTRIBUTE_RD(optionrom_version);

	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(dev_loss_tmo);
	SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
	if (ft->issue_fc_host_lip)
		SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
	if (ft->vport_create)
		SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_create);
	if (ft->vport_delete)
		SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_delete);

	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);
	SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);

	BUG_ON(count > FC_RPORT_NUM_ATTRS);

	i->rport_attrs[count] = NULL;

	/*
	 * Setup Virtual Port Attributes.
	 */
	count=0;
	SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_state);
	SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_last_state);
	SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(node_name);
	SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(port_name);
	SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(roles);
	SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_type);
	SETUP_VPORT_ATTRIBUTE_RW(symbolic_name);
	SETUP_VPORT_ATTRIBUTE_WR(vport_delete);
	SETUP_VPORT_ATTRIBUTE_WR(vport_disable);

	BUG_ON(count > FC_VPORT_NUM_ATTRS);

	i->vport_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);
	transport_container_unregister(&i->vport_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.
 * @shost:	Which &Scsi_Host
 *
 * This routine is expected to be called immediately preceding 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_remove_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_vport *vport = NULL, *next_vport = NULL;
	struct fc_rport *rport = NULL, *next_rport = NULL;
	struct workqueue_struct *work_q;
	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
	unsigned long flags;

	spin_lock_irqsave(shost->host_lock, flags);

	/* Remove any vports */
	list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers) {
		vport->flags |= FC_VPORT_DELETING;
		fc_queue_work(shost, &vport->vport_delete_work);
	}

	/* 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);
	}

	spin_unlock_irqrestore(shost->host_lock, flags);

	/* 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);

static void fc_terminate_rport_io(struct fc_rport *rport)
{
	struct Scsi_Host *shost = rport_to_shost(rport);
	struct fc_internal *i = to_fc_internal(shost->transportt);

	/* Involve the LLDD if possible to terminate all io on the rport. */
	if (i->f->terminate_rport_io)
		i->f->terminate_rport_io(rport);

	/*
	 * Must unblock to flush queued IO. scsi-ml will fail incoming reqs.
	 */
	scsi_target_unblock(&rport->dev, SDEV_TRANSPORT_OFFLINE);
}

/**
 * fc_starget_delete - called to delete the scsi descendants of an rport
 * @work:	remote port to be operated on.
 *
 * Deletes target and all sdevs.
 */
static void
fc_starget_delete(struct work_struct *work)
{
	struct fc_rport *rport =
		container_of(work, struct fc_rport, stgt_delete_work);

	fc_terminate_rport_io(rport);
	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);
	unsigned long flags;
	int do_callback = 0;

	fc_terminate_rport_io(rport);

	/*
	 * 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);

	/*
	 * Cancel any outstanding timers. These should really exist
	 * only when rmmod'ing the LLDD and we're asking for
	 * immediate termination of the rports
	 */
	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);
		cancel_work_sync(&rport->scan_work);
		spin_lock_irqsave(shost->host_lock, flags);
		rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
	}
	spin_unlock_irqrestore(shost->host_lock, flags);

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

	/*
	 * Notify the driver that the rport is now dead. The LLDD will
	 * also guarantee that any communication to the rport is terminated
	 *
	 * Avoid this call if we already called it when we preserved the
	 * rport for the binding.
	 */
	spin_lock_irqsave(shost->host_lock, flags);
	if (!(rport->flags & FC_RPORT_DEVLOSS_CALLBK_DONE) &&
	    (i->f->dev_loss_tmo_callbk)) {
		rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
		do_callback = 1;
	}
	spin_unlock_irqrestore(shost->host_lock, flags);

	if (do_callback)
		i->f->dev_loss_tmo_callbk(rport);

	fc_bsg_remove(rport->rqst_q);

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


/**
 * fc_remote_port_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.
 */
static struct fc_rport *
fc_remote_port_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", __func__);
		return NULL;
	}

	rport->maxframe_size = -1;
	rport->supported_classes = FC_COS_UNSPECIFIED;
	rport->dev_loss_tmo = fc_host->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_PORT_ROLE_FCP_TARGET) ||
	    (rport->roles & FC_PORT_ROLE_FCP_DUMMY_INITIATOR))
		rport->scsi_target_id = fc_host->next_target_id++;
	else
		rport->scsi_target_id = -1;
	list_add_tail(&rport->peers, &fc_host->rports);
	scsi_host_get(shost);			/* 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;
	dev_set_name(dev, "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);

	fc_bsg_rportadd(shost, rport);
	/* ignore any bsg add error - we just can't do sgio */

	if (rport->roles & FC_PORT_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);
	scsi_host_put(shost);			/* for fc_host->rport list */
	spin_unlock_irqrestore(shost->host_lock, flags);
	put_device(dev->parent);
	kfree(rport);
	return NULL;
}

/**
 * fc_remote_port_add - notify 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) {

				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 not a target, cancel the
				 * io terminate and rport timers, and
				 * we're done.
				 *
				 * If we were a target, but our new role
				 * doesn't indicate a target, leave the
				 * timers running expecting the role to
				 * change as the target fully logs in. If
				 * it doesn't, the target will be torn down.
				 *
				 * If we were a target, and our role shows
				 * we're still a target, cancel the timers
				 * and kick off a scan.
				 */

				/* was a target, not in roles */
				if ((rport->scsi_target_id != -1) &&
				    (!(ids->roles & FC_PORT_ROLE_FCP_TARGET)))
					return rport;

				/*
				 * Stop the fail io and dev_loss timers.
				 * If they flush, the port_state will
				 * be checked and will NOOP the function.
				 */
				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_FAST_FAIL_TIMEDOUT |
						  FC_RPORT_DEVLOSS_PENDING |
						  FC_RPORT_DEVLOSS_CALLBK_DONE);

				spin_unlock_irqrestore(shost->host_lock, flags);

				/* if target, initiate a scan */
				if (rport->scsi_target_id != -1) {
					scsi_target_unblock(&rport->dev,
							    SDEV_RUNNING);
					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);
				}

				fc_bsg_goose_queue(rport);

				return rport;
			}
		}
	}

	/*
	 * Search the bindings array
	 * Note: if never a FCP target, you won't be on this list
	 */
	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;
			rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;

			if (fci->f->dd_fcrport_size)
				memset(rport->dd_data, 0,
						fci->f->dd_fcrport_size);
			spin_unlock_irqrestore(shost->host_lock, flags);

			if (ids->roles & FC_PORT_ROLE_FCP_TARGET) {
				scsi_target_unblock(&rport->dev, SDEV_RUNNING);

				/* 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);
			}
			return rport;
		}
	}

	spin_unlock_irqrestore(shost->host_lock, flags);

	/* No consistent binding found - create new remote port entry */
	rport = fc_remote_port_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:
 *
 * 1) 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.
 *
 * 2) 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 also remain.
 *
 * 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 to 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);
	unsigned long 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 (rport->port_state != FC_PORTSTATE_ONLINE) {
		spin_unlock_irqrestore(shost->host_lock, flags);
		return;
	}

	/*
	 * In the past, we if this was not an FCP-Target, we would
	 * unconditionally just jump to deleting the rport.
	 * However, rports can be used as node containers by the LLDD,
	 * and its not appropriate to just terminate the rport at the
	 * first sign of a loss in connectivity. The LLDD may want to
	 * send ELS traffic to re-validate the login. If the rport is
	 * immediately deleted, it makes it inappropriate for a node
	 * container.
	 * So... we now unconditionally wait dev_loss_tmo before
	 * destroying an rport.
	 */

	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))
		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.
 * @roles:      New roles for this port.
 *
 * Description: 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_PORT_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_PORT_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 exists and is 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_FAST_FAIL_TIMEDOUT |
				  FC_RPORT_DEVLOSS_PENDING |
				  FC_RPORT_DEVLOSS_CALLBK_DONE);
		spin_unlock_irqrestore(shost->host_lock, flags);

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

		scsi_target_unblock(&rport->dev, SDEV_RUNNING);
		/* 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);
	}
}
EXPORT_SYMBOL(fc_remote_port_rolechg);

/**
 * fc_timeout_deleted_rport - Timeout handler for a deleted remote port.
 * @work:	rport target that failed to reappear in the allotted time.
 *
 * Description: An attempt to delete a remote port blocks, and if it fails
 *              to return in the allotted time this gets called.
 */
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_internal *i = to_fc_internal(shost->transportt);
	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
	unsigned long flags;
	int do_callback = 0;

	spin_lock_irqsave(shost->host_lock, flags);

	rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;

	/*
	 * If the port is ONLINE, then it came back. If it was a SCSI
	 * target, validate it still is. If not, tear down the
	 * scsi_target on it.
	 */
	if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
	    (rport->scsi_target_id != -1) &&
	    !(rport->roles & FC_PORT_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, SDEV_TRANSPORT_OFFLINE);
		fc_queue_work(shost, &rport->stgt_delete_work);
		return;
	}

	/* NOOP state - we're flushing workq's */
	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"
			" rport%s alone\n",
			(rport->scsi_target_id != -1) ?  " and starget" : "");
		return;
	}

	if ((fc_host->tgtid_bind_type == FC_TGTID_BIND_NONE) ||
	    (rport->scsi_target_id == -1)) {
		list_del(&rport->peers);
		rport->port_state = FC_PORTSTATE_DELETED;
		dev_printk(KERN_ERR, &rport->dev,
			"blocked FC remote port time out: removing"
			" rport%s\n",
			(rport->scsi_target_id != -1) ?  " and starget" : "");
		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_PORT_ROLE_UNKNOWN;
	rport->port_state = FC_PORTSTATE_NOTPRESENT;
	rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;

	/*
	 * Pre-emptively kill I/O rather than waiting for the work queue
	 * item to teardown the starget. (FCOE libFC folks prefer this
	 * and to have the rport_port_id still set when it's done).
	 */
	spin_unlock_irqrestore(shost->host_lock, flags);
	fc_terminate_rport_io(rport);

	spin_lock_irqsave(shost->host_lock, flags);

	if (rport->port_state == FC_PORTSTATE_NOTPRESENT) {	/* still missing */

		/* 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.
		 */
		rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
		fc_queue_work(shost, &rport->stgt_delete_work);

		do_callback = 1;
	}

	spin_unlock_irqrestore(shost->host_lock, flags);

	/*
	 * Notify the driver that the rport is now dead. The LLDD will
	 * also guarantee that any communication to the rport is terminated
	 *
	 * Note: we set the CALLBK_DONE flag above to correspond
	 */
	if (do_callback && i->f->dev_loss_tmo_callbk)
		i->f->dev_loss_tmo_callbk(rport);
}


/**
 * 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);

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

	rport->flags |= FC_RPORT_FAST_FAIL_TIMEDOUT;
	fc_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);
	struct fc_internal *i = to_fc_internal(shost->transportt);
	unsigned long flags;

	if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
	    (rport->roles & FC_PORT_ROLE_FCP_TARGET) &&
	    !(i->f->disable_target_scan)) {
		scsi_scan_target(&rport->dev, rport->channel,
				 rport->scsi_target_id, SCAN_WILD_CARD,
				 SCSI_SCAN_RESCAN);
	}

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

/**
 * fc_block_scsi_eh - Block SCSI eh thread for blocked fc_rport
 * @cmnd: SCSI command that scsi_eh is trying to recover
 *
 * This routine can be called from a FC LLD scsi_eh callback. It
 * blocks the scsi_eh thread until the fc_rport leaves the
 * FC_PORTSTATE_BLOCKED, or the fast_io_fail_tmo fires. This is
 * necessary to avoid the scsi_eh failing recovery actions for blocked
 * rports which would lead to offlined SCSI devices.
 *
 * Returns: 0 if the fc_rport left the state FC_PORTSTATE_BLOCKED.
 *	    FAST_IO_FAIL if the fast_io_fail_tmo fired, this should be
 *	    passed back to scsi_eh.
 */
int fc_block_scsi_eh(struct scsi_cmnd *cmnd)
{
	struct Scsi_Host *shost = cmnd->device->host;
	struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
	unsigned long flags;

	spin_lock_irqsave(shost->host_lock, flags);
	while (rport->port_state == FC_PORTSTATE_BLOCKED &&
	       !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)) {
		spin_unlock_irqrestore(shost->host_lock, flags);
		msleep(1000);
		spin_lock_irqsave(shost->host_lock, flags);
	}
	spin_unlock_irqrestore(shost->host_lock, flags);

	if (rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)
		return FAST_IO_FAIL;

	return 0;
}
EXPORT_SYMBOL(fc_block_scsi_eh);

/**
 * fc_vport_setup - allocates and creates a FC virtual port.
 * @shost:	scsi host the virtual port is connected to.
 * @channel:	Channel on shost port connected to.
 * @pdev:	parent device for vport
 * @ids:	The world wide names, FC4 port roles, etc for
 *              the virtual port.
 * @ret_vport:	The pointer to the created vport.
 *
 * Allocates and creates the vport structure, calls the parent host
 * to instantiate the vport, this completes w/ class and sysfs creation.
 *
 * Notes:
 *	This routine assumes no locks are held on entry.
 */
static int
fc_vport_setup(struct Scsi_Host *shost, int channel, struct device *pdev,
	struct fc_vport_identifiers  *ids, struct fc_vport **ret_vport)
{
	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
	struct fc_internal *fci = to_fc_internal(shost->transportt);
	struct fc_vport *vport;
	struct device *dev;
	unsigned long flags;
	size_t size;
	int error;

	*ret_vport = NULL;

	if ( ! fci->f->vport_create)
		return -ENOENT;

	size = (sizeof(struct fc_vport) + fci->f->dd_fcvport_size);
	vport = kzalloc(size, GFP_KERNEL);
	if (unlikely(!vport)) {
		printk(KERN_ERR "%s: allocation failure\n", __func__);
		return -ENOMEM;
	}

	vport->vport_state = FC_VPORT_UNKNOWN;
	vport->vport_last_state = FC_VPORT_UNKNOWN;
	vport->node_name = ids->node_name;
	vport->port_name = ids->port_name;
	vport->roles = ids->roles;
	vport->vport_type = ids->vport_type;
	if (fci->f->dd_fcvport_size)
		vport->dd_data = &vport[1];
	vport->shost = shost;
	vport->channel = channel;
	vport->flags = FC_VPORT_CREATING;
	INIT_WORK(&vport->vport_delete_work, fc_vport_sched_delete);

	spin_lock_irqsave(shost->host_lock, flags);

	if (fc_host->npiv_vports_inuse >= fc_host->max_npiv_vports) {
		spin_unlock_irqrestore(shost->host_lock, flags);
		kfree(vport);
		return -ENOSPC;
	}
	fc_host->npiv_vports_inuse++;
	vport->number = fc_host->next_vport_number++;
	list_add_tail(&vport->peers, &fc_host->vports);
	scsi_host_get(shost);			/* for fc_host->vport list */

	spin_unlock_irqrestore(shost->host_lock, flags);

	dev = &vport->dev;
	device_initialize(dev);			/* takes self reference */
	dev->parent = get_device(pdev);		/* takes parent reference */
	dev->release = fc_vport_dev_release;
	dev_set_name(dev, "vport-%d:%d-%d",
		     shost->host_no, channel, vport->number);
	transport_setup_device(dev);

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

	error = fci->f->vport_create(vport, ids->disable);
	if (error) {
		printk(KERN_ERR "FC Virtual Port LLDD Create failed\n");
		goto delete_vport_all;
	}

	/*
	 * if the parent isn't the physical adapter's Scsi_Host, ensure
	 * the Scsi_Host at least contains a symlink to the vport.
	 */
	if (pdev != &shost->shost_gendev) {
		error = sysfs_create_link(&shost->shost_gendev.kobj,
				 &dev->kobj, dev_name(dev));
		if (error)
			printk(KERN_ERR
				"%s: Cannot create vport symlinks for "
				"%s, err=%d\n",
				__func__, dev_name(dev), error);
	}
	spin_lock_irqsave(shost->host_lock, flags);
	vport->flags &= ~FC_VPORT_CREATING;
	spin_unlock_irqrestore(shost->host_lock, flags);

	dev_printk(KERN_NOTICE, pdev,
			"%s created via shost%d channel %d\n", dev_name(dev),
			shost->host_no, channel);

	*ret_vport = vport;

	return 0;

delete_vport_all:
	transport_remove_device(dev);
	device_del(dev);
delete_vport:
	transport_destroy_device(dev);
	spin_lock_irqsave(shost->host_lock, flags);
	list_del(&vport->peers);
	scsi_host_put(shost);			/* for fc_host->vport list */
	fc_host->npiv_vports_inuse--;
	spin_unlock_irqrestore(shost->host_lock, flags);
	put_device(dev->parent);
	kfree(vport);

	return error;
}

/**
 * fc_vport_create - Admin App or LLDD requests creation of a vport
 * @shost:	scsi host the virtual port is connected to.
 * @channel:	channel on shost port connected to.
 * @ids:	The world wide names, FC4 port roles, etc for
 *              the virtual port.
 *
 * Notes:
 *	This routine assumes no locks are held on entry.
 */
struct fc_vport *
fc_vport_create(struct Scsi_Host *shost, int channel,
	struct fc_vport_identifiers *ids)
{
	int stat;
	struct fc_vport *vport;

	stat = fc_vport_setup(shost, channel, &shost->shost_gendev,
		 ids, &vport);
	return stat ? NULL : vport;
}
EXPORT_SYMBOL(fc_vport_create);

/**
 * fc_vport_terminate - Admin App or LLDD requests termination of a vport
 * @vport:	fc_vport to be terminated
 *
 * Calls the LLDD vport_delete() function, then deallocates and removes
 * the vport from the shost and object tree.
 *
 * Notes:
 *	This routine assumes no locks are held on entry.
 */
int
fc_vport_terminate(struct fc_vport *vport)
{
	struct Scsi_Host *shost = vport_to_shost(vport);
	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
	struct fc_internal *i = to_fc_internal(shost->transportt);
	struct device *dev = &vport->dev;
	unsigned long flags;
	int stat;

	if (i->f->vport_delete)
		stat = i->f->vport_delete(vport);
	else
		stat = -ENOENT;

	spin_lock_irqsave(shost->host_lock, flags);
	vport->flags &= ~FC_VPORT_DELETING;
	if (!stat) {
		vport->flags |= FC_VPORT_DELETED;
		list_del(&vport->peers);
		fc_host->npiv_vports_inuse--;
		scsi_host_put(shost);		/* for fc_host->vport list */
	}
	spin_unlock_irqrestore(shost->host_lock, flags);

	if (stat)
		return stat;

	if (dev->parent != &shost->shost_gendev)
		sysfs_remove_link(&shost->shost_gendev.kobj, dev_name(dev));
	transport_remove_device(dev);
	device_del(dev);
	transport_destroy_device(dev);

	/*
	 * Removing our self-reference should mean our
	 * release function gets called, which will drop the remaining
	 * parent reference and free the data structure.
	 */
	put_device(dev);			/* for self-reference */

	return 0; /* SUCCESS */
}
EXPORT_SYMBOL(fc_vport_terminate);

/**
 * fc_vport_sched_delete - workq-based delete request for a vport
 * @work:	vport to be deleted.
 */
static void
fc_vport_sched_delete(struct work_struct *work)
{
	struct fc_vport *vport =
		container_of(work, struct fc_vport, vport_delete_work);
	int stat;

	stat = fc_vport_terminate(vport);
	if (stat)
		dev_printk(KERN_ERR, vport->dev.parent,
			"%s: %s could not be deleted created via "
			"shost%d channel %d - error %d\n", __func__,
			dev_name(&vport->dev), vport->shost->host_no,
			vport->channel, stat);
}


/*
 * BSG support
 */

/**
 * fc_bsg_job_timeout - handler for when a bsg request timesout
 * @req:	request that timed out
 */
static enum blk_eh_timer_return
fc_bsg_job_timeout(struct request *req)
{
	struct bsg_job *job = (void *) req->special;
	struct Scsi_Host *shost = fc_bsg_to_shost(job);
	struct fc_rport *rport = fc_bsg_to_rport(job);
	struct fc_internal *i = to_fc_internal(shost->transportt);
	int err = 0, inflight = 0;

	if (rport && rport->port_state == FC_PORTSTATE_BLOCKED)
		return BLK_EH_RESET_TIMER;

	inflight = bsg_job_get(job);

	if (inflight && i->f->bsg_timeout) {
		/* call LLDD to abort the i/o as it has timed out */
		err = i->f->bsg_timeout(job);
		if (err == -EAGAIN) {
			bsg_job_put(job);
			return BLK_EH_RESET_TIMER;
		} else if (err)
			printk(KERN_ERR "ERROR: FC BSG request timeout - LLD "
				"abort failed with status %d\n", err);
	}

	/* the blk_end_sync_io() doesn't check the error */
	if (!inflight)
		return BLK_EH_NOT_HANDLED;
	else
		return BLK_EH_HANDLED;
}

/**
 * fc_bsg_host_dispatch - process fc host bsg requests and dispatch to LLDD
 * @shost:	scsi host rport attached to
 * @job:	bsg job to be processed
 */
static int fc_bsg_host_dispatch(struct Scsi_Host *shost, struct bsg_job *job)
{
	struct fc_internal *i = to_fc_internal(shost->transportt);
	struct fc_bsg_request *bsg_request = job->request;
	struct fc_bsg_reply *bsg_reply = job->reply;
	int cmdlen = sizeof(uint32_t);	/* start with length of msgcode */
	int ret;

	/* check if we really have all the request data needed */
	if (job->request_len < cmdlen) {
		ret = -ENOMSG;
		goto fail_host_msg;
	}

	/* Validate the host command */
	switch (bsg_request->msgcode) {
	case FC_BSG_HST_ADD_RPORT:
		cmdlen += sizeof(struct fc_bsg_host_add_rport);
		break;

	case FC_BSG_HST_DEL_RPORT:
		cmdlen += sizeof(struct fc_bsg_host_del_rport);
		break;

	case FC_BSG_HST_ELS_NOLOGIN:
		cmdlen += sizeof(struct fc_bsg_host_els);
		/* there better be a xmt and rcv payloads */
		if ((!job->request_payload.payload_len) ||
		    (!job->reply_payload.payload_len)) {
			ret = -EINVAL;
			goto fail_host_msg;
		}
		break;

	case FC_BSG_HST_CT:
		cmdlen += sizeof(struct fc_bsg_host_ct);
		/* there better be xmt and rcv payloads */
		if ((!job->request_payload.payload_len) ||
		    (!job->reply_payload.payload_len)) {
			ret = -EINVAL;
			goto fail_host_msg;
		}
		break;

	case FC_BSG_HST_VENDOR:
		cmdlen += sizeof(struct fc_bsg_host_vendor);
		if ((shost->hostt->vendor_id == 0L) ||
		    (bsg_request->rqst_data.h_vendor.vendor_id !=
			shost->hostt->vendor_id)) {
			ret = -ESRCH;
			goto fail_host_msg;
		}
		break;

	default:
		ret = -EBADR;
		goto fail_host_msg;
	}

	ret = i->f->bsg_request(job);
	if (!ret)
		return 0;

fail_host_msg:
	/* return the errno failure code as the only status */
	BUG_ON(job->reply_len < sizeof(uint32_t));
	bsg_reply->reply_payload_rcv_len = 0;
	bsg_reply->result = ret;
	job->reply_len = sizeof(uint32_t);
	bsg_job_done(job, bsg_reply->result,
		       bsg_reply->reply_payload_rcv_len);
	return 0;
}


/*
 * fc_bsg_goose_queue - restart rport queue in case it was stopped
 * @rport:	rport to be restarted
 */
static void
fc_bsg_goose_queue(struct fc_rport *rport)
{
	struct request_queue *q = rport->rqst_q;
	unsigned long flags;

	if (!q)
		return;

	spin_lock_irqsave(q->queue_lock, flags);
	blk_run_queue_async(q);
	spin_unlock_irqrestore(q->queue_lock, flags);
}

/**
 * fc_bsg_rport_dispatch - process rport bsg requests and dispatch to LLDD
 * @shost:	scsi host rport attached to
 * @job:	bsg job to be processed
 */
static int fc_bsg_rport_dispatch(struct Scsi_Host *shost, struct bsg_job *job)
{
	struct fc_internal *i = to_fc_internal(shost->transportt);
	struct fc_bsg_request *bsg_request = job->request;
	struct fc_bsg_reply *bsg_reply = job->reply;
	int cmdlen = sizeof(uint32_t);	/* start with length of msgcode */
	int ret;

	/* check if we really have all the request data needed */
	if (job->request_len < cmdlen) {
		ret = -ENOMSG;
		goto fail_rport_msg;
	}

	/* Validate the rport command */
	switch (bsg_request->msgcode) {
	case FC_BSG_RPT_ELS:
		cmdlen += sizeof(struct fc_bsg_rport_els);
		goto check_bidi;

	case FC_BSG_RPT_CT:
		cmdlen += sizeof(struct fc_bsg_rport_ct);
check_bidi:
		/* there better be xmt and rcv payloads */
		if ((!job->request_payload.payload_len) ||
		    (!job->reply_payload.payload_len)) {
			ret = -EINVAL;
			goto fail_rport_msg;
		}
		break;
	default:
		ret = -EBADR;
		goto fail_rport_msg;
	}

	ret = i->f->bsg_request(job);
	if (!ret)
		return 0;

fail_rport_msg:
	/* return the errno failure code as the only status */
	BUG_ON(job->reply_len < sizeof(uint32_t));
	bsg_reply->reply_payload_rcv_len = 0;
	bsg_reply->result = ret;
	job->reply_len = sizeof(uint32_t);
	bsg_job_done(job, bsg_reply->result,
		       bsg_reply->reply_payload_rcv_len);
	return 0;
}

static int fc_bsg_dispatch(struct bsg_job *job)
{
	struct Scsi_Host *shost = fc_bsg_to_shost(job);

	if (scsi_is_fc_rport(job->dev))
		return fc_bsg_rport_dispatch(shost, job);
	else
		return fc_bsg_host_dispatch(shost, job);
}

/**
 * fc_bsg_hostadd - Create and add the bsg hooks so we can receive requests
 * @shost:	shost for fc_host
 * @fc_host:	fc_host adding the structures to
 */
static int
fc_bsg_hostadd(struct Scsi_Host *shost, struct fc_host_attrs *fc_host)
{
	struct device *dev = &shost->shost_gendev;
	struct fc_internal *i = to_fc_internal(shost->transportt);
	struct request_queue *q;
	char bsg_name[20];

	fc_host->rqst_q = NULL;

	if (!i->f->bsg_request)
		return -ENOTSUPP;

	snprintf(bsg_name, sizeof(bsg_name),
		 "fc_host%d", shost->host_no);

	q = bsg_setup_queue(dev, bsg_name, fc_bsg_dispatch, i->f->dd_bsg_size);
	if (IS_ERR(q)) {
		dev_err(dev,
			"fc_host%d: bsg interface failed to initialize - setup queue\n",
			shost->host_no);
		return PTR_ERR(q);
	}
	__scsi_init_queue(shost, q);
	blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
	blk_queue_rq_timeout(q, FC_DEFAULT_BSG_TIMEOUT);
	fc_host->rqst_q = q;
	return 0;
}

static int fc_bsg_rport_prep(struct request_queue *q, struct request *req)
{
	struct fc_rport *rport = dev_to_rport(q->queuedata);

	if (rport->port_state == FC_PORTSTATE_BLOCKED &&
	    !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT))
		return BLKPREP_DEFER;

	if (rport->port_state != FC_PORTSTATE_ONLINE)
		return BLKPREP_KILL;

	return BLKPREP_OK;
}

/**
 * fc_bsg_rportadd - Create and add the bsg hooks so we can receive requests
 * @shost:	shost that rport is attached to
 * @rport:	rport that the bsg hooks are being attached to
 */
static int
fc_bsg_rportadd(struct Scsi_Host *shost, struct fc_rport *rport)
{
	struct device *dev = &rport->dev;
	struct fc_internal *i = to_fc_internal(shost->transportt);
	struct request_queue *q;

	rport->rqst_q = NULL;

	if (!i->f->bsg_request)
		return -ENOTSUPP;

	q = bsg_setup_queue(dev, NULL, fc_bsg_dispatch, i->f->dd_bsg_size);
	if (IS_ERR(q)) {
		dev_err(dev, "failed to setup bsg queue\n");
		return PTR_ERR(q);
	}
	__scsi_init_queue(shost, q);
	blk_queue_prep_rq(q, fc_bsg_rport_prep);
	blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
	blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT);
	rport->rqst_q = q;
	return 0;
}


/**
 * fc_bsg_remove - Deletes the bsg hooks on fchosts/rports
 * @q:	the request_queue that is to be torn down.
 *
 * Notes:
 *   Before unregistering the queue empty any requests that are blocked
 *
 *
 */
static void
fc_bsg_remove(struct request_queue *q)
{
	if (q) {
		bsg_unregister_queue(q);
		blk_cleanup_queue(q);
	}
}


/* Original Author:  Martin Hicks */
MODULE_AUTHOR("James Smart");
MODULE_DESCRIPTION("FC Transport Attributes");
MODULE_LICENSE("GPL");

module_init(fc_transport_init);
module_exit(fc_transport_exit);