summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/bnx2fc/bnx2fc_io.c
blob: 9ecca8504f60e64084e1e55487602011e7386e30 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
/* bnx2fc_io.c: QLogic NetXtreme II Linux FCoE offload driver.
 * IO manager and SCSI IO processing.
 *
 * Copyright (c) 2008 - 2013 Broadcom Corporation
 * Copyright (c) 2014, QLogic Corporation
 *
 * 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.
 *
 * Written by: Bhanu Prakash Gollapudi (bprakash@broadcom.com)
 */

#include "bnx2fc.h"

#define RESERVE_FREE_LIST_INDEX num_possible_cpus()

static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
			   int bd_index);
static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req);
static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req);
static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req);
static void bnx2fc_free_mp_resc(struct bnx2fc_cmd *io_req);
static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
				 struct fcoe_fcp_rsp_payload *fcp_rsp,
				 u8 num_rq);

void bnx2fc_cmd_timer_set(struct bnx2fc_cmd *io_req,
			  unsigned int timer_msec)
{
	struct bnx2fc_interface *interface = io_req->port->priv;

	if (queue_delayed_work(interface->timer_work_queue,
			       &io_req->timeout_work,
			       msecs_to_jiffies(timer_msec)))
		kref_get(&io_req->refcount);
}

static void bnx2fc_cmd_timeout(struct work_struct *work)
{
	struct bnx2fc_cmd *io_req = container_of(work, struct bnx2fc_cmd,
						 timeout_work.work);
	struct fc_lport *lport;
	struct fc_rport_priv *rdata;
	u8 cmd_type = io_req->cmd_type;
	struct bnx2fc_rport *tgt = io_req->tgt;
	int logo_issued;
	int rc;

	BNX2FC_IO_DBG(io_req, "cmd_timeout, cmd_type = %d,"
		      "req_flags = %lx\n", cmd_type, io_req->req_flags);

	spin_lock_bh(&tgt->tgt_lock);
	if (test_and_clear_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags)) {
		clear_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
		/*
		 * ideally we should hold the io_req until RRQ complets,
		 * and release io_req from timeout hold.
		 */
		spin_unlock_bh(&tgt->tgt_lock);
		bnx2fc_send_rrq(io_req);
		return;
	}
	if (test_and_clear_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags)) {
		BNX2FC_IO_DBG(io_req, "IO ready for reuse now\n");
		goto done;
	}

	switch (cmd_type) {
	case BNX2FC_SCSI_CMD:
		if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
							&io_req->req_flags)) {
			/* Handle eh_abort timeout */
			BNX2FC_IO_DBG(io_req, "eh_abort timed out\n");
			complete(&io_req->tm_done);
		} else if (test_bit(BNX2FC_FLAG_ISSUE_ABTS,
				    &io_req->req_flags)) {
			/* Handle internally generated ABTS timeout */
			BNX2FC_IO_DBG(io_req, "ABTS timed out refcnt = %d\n",
					io_req->refcount.refcount.counter);
			if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
					       &io_req->req_flags))) {

				lport = io_req->port->lport;
				rdata = io_req->tgt->rdata;
				logo_issued = test_and_set_bit(
						BNX2FC_FLAG_EXPL_LOGO,
						&tgt->flags);
				kref_put(&io_req->refcount, bnx2fc_cmd_release);
				spin_unlock_bh(&tgt->tgt_lock);

				/* Explicitly logo the target */
				if (!logo_issued) {
					BNX2FC_IO_DBG(io_req, "Explicit "
						   "logo - tgt flags = 0x%lx\n",
						   tgt->flags);

					mutex_lock(&lport->disc.disc_mutex);
					lport->tt.rport_logoff(rdata);
					mutex_unlock(&lport->disc.disc_mutex);
				}
				return;
			}
		} else {
			/* Hanlde IO timeout */
			BNX2FC_IO_DBG(io_req, "IO timed out. issue ABTS\n");
			if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL,
					     &io_req->req_flags)) {
				BNX2FC_IO_DBG(io_req, "IO completed before "
							   " timer expiry\n");
				goto done;
			}

			if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
					      &io_req->req_flags)) {
				rc = bnx2fc_initiate_abts(io_req);
				if (rc == SUCCESS)
					goto done;
				/*
				 * Explicitly logo the target if
				 * abts initiation fails
				 */
				lport = io_req->port->lport;
				rdata = io_req->tgt->rdata;
				logo_issued = test_and_set_bit(
						BNX2FC_FLAG_EXPL_LOGO,
						&tgt->flags);
				kref_put(&io_req->refcount, bnx2fc_cmd_release);
				spin_unlock_bh(&tgt->tgt_lock);

				if (!logo_issued) {
					BNX2FC_IO_DBG(io_req, "Explicit "
						   "logo - tgt flags = 0x%lx\n",
						   tgt->flags);


					mutex_lock(&lport->disc.disc_mutex);
					lport->tt.rport_logoff(rdata);
					mutex_unlock(&lport->disc.disc_mutex);
				}
				return;
			} else {
				BNX2FC_IO_DBG(io_req, "IO already in "
						      "ABTS processing\n");
			}
		}
		break;
	case BNX2FC_ELS:

		if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
			BNX2FC_IO_DBG(io_req, "ABTS for ELS timed out\n");

			if (!test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
					      &io_req->req_flags)) {
				lport = io_req->port->lport;
				rdata = io_req->tgt->rdata;
				logo_issued = test_and_set_bit(
						BNX2FC_FLAG_EXPL_LOGO,
						&tgt->flags);
				kref_put(&io_req->refcount, bnx2fc_cmd_release);
				spin_unlock_bh(&tgt->tgt_lock);

				/* Explicitly logo the target */
				if (!logo_issued) {
					BNX2FC_IO_DBG(io_req, "Explicitly logo"
						   "(els)\n");
					mutex_lock(&lport->disc.disc_mutex);
					lport->tt.rport_logoff(rdata);
					mutex_unlock(&lport->disc.disc_mutex);
				}
				return;
			}
		} else {
			/*
			 * Handle ELS timeout.
			 * tgt_lock is used to sync compl path and timeout
			 * path. If els compl path is processing this IO, we
			 * have nothing to do here, just release the timer hold
			 */
			BNX2FC_IO_DBG(io_req, "ELS timed out\n");
			if (test_and_set_bit(BNX2FC_FLAG_ELS_DONE,
					       &io_req->req_flags))
				goto done;

			/* Indicate the cb_func that this ELS is timed out */
			set_bit(BNX2FC_FLAG_ELS_TIMEOUT, &io_req->req_flags);

			if ((io_req->cb_func) && (io_req->cb_arg)) {
				io_req->cb_func(io_req->cb_arg);
				io_req->cb_arg = NULL;
			}
		}
		break;
	default:
		printk(KERN_ERR PFX "cmd_timeout: invalid cmd_type %d\n",
			cmd_type);
		break;
	}

done:
	/* release the cmd that was held when timer was set */
	kref_put(&io_req->refcount, bnx2fc_cmd_release);
	spin_unlock_bh(&tgt->tgt_lock);
}

static void bnx2fc_scsi_done(struct bnx2fc_cmd *io_req, int err_code)
{
	/* Called with host lock held */
	struct scsi_cmnd *sc_cmd = io_req->sc_cmd;

	/*
	 * active_cmd_queue may have other command types as well,
	 * and during flush operation,  we want to error back only
	 * scsi commands.
	 */
	if (io_req->cmd_type != BNX2FC_SCSI_CMD)
		return;

	BNX2FC_IO_DBG(io_req, "scsi_done. err_code = 0x%x\n", err_code);
	if (test_bit(BNX2FC_FLAG_CMD_LOST, &io_req->req_flags)) {
		/* Do not call scsi done for this IO */
		return;
	}

	bnx2fc_unmap_sg_list(io_req);
	io_req->sc_cmd = NULL;
	if (!sc_cmd) {
		printk(KERN_ERR PFX "scsi_done - sc_cmd NULL. "
				    "IO(0x%x) already cleaned up\n",
		       io_req->xid);
		return;
	}
	sc_cmd->result = err_code << 16;

	BNX2FC_IO_DBG(io_req, "sc=%p, result=0x%x, retries=%d, allowed=%d\n",
		sc_cmd, host_byte(sc_cmd->result), sc_cmd->retries,
		sc_cmd->allowed);
	scsi_set_resid(sc_cmd, scsi_bufflen(sc_cmd));
	sc_cmd->SCp.ptr = NULL;
	sc_cmd->scsi_done(sc_cmd);
}

struct bnx2fc_cmd_mgr *bnx2fc_cmd_mgr_alloc(struct bnx2fc_hba *hba)
{
	struct bnx2fc_cmd_mgr *cmgr;
	struct io_bdt *bdt_info;
	struct bnx2fc_cmd *io_req;
	size_t len;
	u32 mem_size;
	u16 xid;
	int i;
	int num_ios, num_pri_ios;
	size_t bd_tbl_sz;
	int arr_sz = num_possible_cpus() + 1;
	u16 min_xid = BNX2FC_MIN_XID;
	u16 max_xid = hba->max_xid;

	if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN) {
		printk(KERN_ERR PFX "cmd_mgr_alloc: Invalid min_xid 0x%x \
					and max_xid 0x%x\n", min_xid, max_xid);
		return NULL;
	}
	BNX2FC_MISC_DBG("min xid 0x%x, max xid 0x%x\n", min_xid, max_xid);

	num_ios = max_xid - min_xid + 1;
	len = (num_ios * (sizeof(struct bnx2fc_cmd *)));
	len += sizeof(struct bnx2fc_cmd_mgr);

	cmgr = kzalloc(len, GFP_KERNEL);
	if (!cmgr) {
		printk(KERN_ERR PFX "failed to alloc cmgr\n");
		return NULL;
	}

	cmgr->free_list = kzalloc(sizeof(*cmgr->free_list) *
				  arr_sz, GFP_KERNEL);
	if (!cmgr->free_list) {
		printk(KERN_ERR PFX "failed to alloc free_list\n");
		goto mem_err;
	}

	cmgr->free_list_lock = kzalloc(sizeof(*cmgr->free_list_lock) *
				       arr_sz, GFP_KERNEL);
	if (!cmgr->free_list_lock) {
		printk(KERN_ERR PFX "failed to alloc free_list_lock\n");
		kfree(cmgr->free_list);
		cmgr->free_list = NULL;
		goto mem_err;
	}

	cmgr->hba = hba;
	cmgr->cmds = (struct bnx2fc_cmd **)(cmgr + 1);

	for (i = 0; i < arr_sz; i++)  {
		INIT_LIST_HEAD(&cmgr->free_list[i]);
		spin_lock_init(&cmgr->free_list_lock[i]);
	}

	/*
	 * Pre-allocated pool of bnx2fc_cmds.
	 * Last entry in the free list array is the free list
	 * of slow path requests.
	 */
	xid = BNX2FC_MIN_XID;
	num_pri_ios = num_ios - hba->elstm_xids;
	for (i = 0; i < num_ios; i++) {
		io_req = kzalloc(sizeof(*io_req), GFP_KERNEL);

		if (!io_req) {
			printk(KERN_ERR PFX "failed to alloc io_req\n");
			goto mem_err;
		}

		INIT_LIST_HEAD(&io_req->link);
		INIT_DELAYED_WORK(&io_req->timeout_work, bnx2fc_cmd_timeout);

		io_req->xid = xid++;
		if (i < num_pri_ios)
			list_add_tail(&io_req->link,
				&cmgr->free_list[io_req->xid %
						 num_possible_cpus()]);
		else
			list_add_tail(&io_req->link,
				&cmgr->free_list[num_possible_cpus()]);
		io_req++;
	}

	/* Allocate pool of io_bdts - one for each bnx2fc_cmd */
	mem_size = num_ios * sizeof(struct io_bdt *);
	cmgr->io_bdt_pool = kmalloc(mem_size, GFP_KERNEL);
	if (!cmgr->io_bdt_pool) {
		printk(KERN_ERR PFX "failed to alloc io_bdt_pool\n");
		goto mem_err;
	}

	mem_size = sizeof(struct io_bdt);
	for (i = 0; i < num_ios; i++) {
		cmgr->io_bdt_pool[i] = kmalloc(mem_size, GFP_KERNEL);
		if (!cmgr->io_bdt_pool[i]) {
			printk(KERN_ERR PFX "failed to alloc "
				"io_bdt_pool[%d]\n", i);
			goto mem_err;
		}
	}

	/* Allocate an map fcoe_bdt_ctx structures */
	bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
	for (i = 0; i < num_ios; i++) {
		bdt_info = cmgr->io_bdt_pool[i];
		bdt_info->bd_tbl = dma_alloc_coherent(&hba->pcidev->dev,
						      bd_tbl_sz,
						      &bdt_info->bd_tbl_dma,
						      GFP_KERNEL);
		if (!bdt_info->bd_tbl) {
			printk(KERN_ERR PFX "failed to alloc "
				"bdt_tbl[%d]\n", i);
			goto mem_err;
		}
	}

	return cmgr;

mem_err:
	bnx2fc_cmd_mgr_free(cmgr);
	return NULL;
}

void bnx2fc_cmd_mgr_free(struct bnx2fc_cmd_mgr *cmgr)
{
	struct io_bdt *bdt_info;
	struct bnx2fc_hba *hba = cmgr->hba;
	size_t bd_tbl_sz;
	u16 min_xid = BNX2FC_MIN_XID;
	u16 max_xid = hba->max_xid;
	int num_ios;
	int i;

	num_ios = max_xid - min_xid + 1;

	/* Free fcoe_bdt_ctx structures */
	if (!cmgr->io_bdt_pool)
		goto free_cmd_pool;

	bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
	for (i = 0; i < num_ios; i++) {
		bdt_info = cmgr->io_bdt_pool[i];
		if (bdt_info->bd_tbl) {
			dma_free_coherent(&hba->pcidev->dev, bd_tbl_sz,
					    bdt_info->bd_tbl,
					    bdt_info->bd_tbl_dma);
			bdt_info->bd_tbl = NULL;
		}
	}

	/* Destroy io_bdt pool */
	for (i = 0; i < num_ios; i++) {
		kfree(cmgr->io_bdt_pool[i]);
		cmgr->io_bdt_pool[i] = NULL;
	}

	kfree(cmgr->io_bdt_pool);
	cmgr->io_bdt_pool = NULL;

free_cmd_pool:
	kfree(cmgr->free_list_lock);

	/* Destroy cmd pool */
	if (!cmgr->free_list)
		goto free_cmgr;

	for (i = 0; i < num_possible_cpus() + 1; i++)  {
		struct bnx2fc_cmd *tmp, *io_req;

		list_for_each_entry_safe(io_req, tmp,
					 &cmgr->free_list[i], link) {
			list_del(&io_req->link);
			kfree(io_req);
		}
	}
	kfree(cmgr->free_list);
free_cmgr:
	/* Free command manager itself */
	kfree(cmgr);
}

struct bnx2fc_cmd *bnx2fc_elstm_alloc(struct bnx2fc_rport *tgt, int type)
{
	struct fcoe_port *port = tgt->port;
	struct bnx2fc_interface *interface = port->priv;
	struct bnx2fc_cmd_mgr *cmd_mgr = interface->hba->cmd_mgr;
	struct bnx2fc_cmd *io_req;
	struct list_head *listp;
	struct io_bdt *bd_tbl;
	int index = RESERVE_FREE_LIST_INDEX;
	u32 free_sqes;
	u32 max_sqes;
	u16 xid;

	max_sqes = tgt->max_sqes;
	switch (type) {
	case BNX2FC_TASK_MGMT_CMD:
		max_sqes = BNX2FC_TM_MAX_SQES;
		break;
	case BNX2FC_ELS:
		max_sqes = BNX2FC_ELS_MAX_SQES;
		break;
	default:
		break;
	}

	/*
	 * NOTE: Free list insertions and deletions are protected with
	 * cmgr lock
	 */
	spin_lock_bh(&cmd_mgr->free_list_lock[index]);
	free_sqes = atomic_read(&tgt->free_sqes);
	if ((list_empty(&(cmd_mgr->free_list[index]))) ||
	    (tgt->num_active_ios.counter  >= max_sqes) ||
	    (free_sqes + max_sqes <= BNX2FC_SQ_WQES_MAX)) {
		BNX2FC_TGT_DBG(tgt, "No free els_tm cmds available "
			"ios(%d):sqes(%d)\n",
			tgt->num_active_ios.counter, tgt->max_sqes);
		if (list_empty(&(cmd_mgr->free_list[index])))
			printk(KERN_ERR PFX "elstm_alloc: list_empty\n");
		spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
		return NULL;
	}

	listp = (struct list_head *)
			cmd_mgr->free_list[index].next;
	list_del_init(listp);
	io_req = (struct bnx2fc_cmd *) listp;
	xid = io_req->xid;
	cmd_mgr->cmds[xid] = io_req;
	atomic_inc(&tgt->num_active_ios);
	atomic_dec(&tgt->free_sqes);
	spin_unlock_bh(&cmd_mgr->free_list_lock[index]);

	INIT_LIST_HEAD(&io_req->link);

	io_req->port = port;
	io_req->cmd_mgr = cmd_mgr;
	io_req->req_flags = 0;
	io_req->cmd_type = type;

	/* Bind io_bdt for this io_req */
	/* Have a static link between io_req and io_bdt_pool */
	bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
	bd_tbl->io_req = io_req;

	/* Hold the io_req  against deletion */
	kref_init(&io_req->refcount);
	return io_req;
}

struct bnx2fc_cmd *bnx2fc_cmd_alloc(struct bnx2fc_rport *tgt)
{
	struct fcoe_port *port = tgt->port;
	struct bnx2fc_interface *interface = port->priv;
	struct bnx2fc_cmd_mgr *cmd_mgr = interface->hba->cmd_mgr;
	struct bnx2fc_cmd *io_req;
	struct list_head *listp;
	struct io_bdt *bd_tbl;
	u32 free_sqes;
	u32 max_sqes;
	u16 xid;
	int index = get_cpu();

	max_sqes = BNX2FC_SCSI_MAX_SQES;
	/*
	 * NOTE: Free list insertions and deletions are protected with
	 * cmgr lock
	 */
	spin_lock_bh(&cmd_mgr->free_list_lock[index]);
	free_sqes = atomic_read(&tgt->free_sqes);
	if ((list_empty(&cmd_mgr->free_list[index])) ||
	    (tgt->num_active_ios.counter  >= max_sqes) ||
	    (free_sqes + max_sqes <= BNX2FC_SQ_WQES_MAX)) {
		spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
		put_cpu();
		return NULL;
	}

	listp = (struct list_head *)
		cmd_mgr->free_list[index].next;
	list_del_init(listp);
	io_req = (struct bnx2fc_cmd *) listp;
	xid = io_req->xid;
	cmd_mgr->cmds[xid] = io_req;
	atomic_inc(&tgt->num_active_ios);
	atomic_dec(&tgt->free_sqes);
	spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
	put_cpu();

	INIT_LIST_HEAD(&io_req->link);

	io_req->port = port;
	io_req->cmd_mgr = cmd_mgr;
	io_req->req_flags = 0;

	/* Bind io_bdt for this io_req */
	/* Have a static link between io_req and io_bdt_pool */
	bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
	bd_tbl->io_req = io_req;

	/* Hold the io_req  against deletion */
	kref_init(&io_req->refcount);
	return io_req;
}

void bnx2fc_cmd_release(struct kref *ref)
{
	struct bnx2fc_cmd *io_req = container_of(ref,
						struct bnx2fc_cmd, refcount);
	struct bnx2fc_cmd_mgr *cmd_mgr = io_req->cmd_mgr;
	int index;

	if (io_req->cmd_type == BNX2FC_SCSI_CMD)
		index = io_req->xid % num_possible_cpus();
	else
		index = RESERVE_FREE_LIST_INDEX;


	spin_lock_bh(&cmd_mgr->free_list_lock[index]);
	if (io_req->cmd_type != BNX2FC_SCSI_CMD)
		bnx2fc_free_mp_resc(io_req);
	cmd_mgr->cmds[io_req->xid] = NULL;
	/* Delete IO from retire queue */
	list_del_init(&io_req->link);
	/* Add it to the free list */
	list_add(&io_req->link,
			&cmd_mgr->free_list[index]);
	atomic_dec(&io_req->tgt->num_active_ios);
	spin_unlock_bh(&cmd_mgr->free_list_lock[index]);

}

static void bnx2fc_free_mp_resc(struct bnx2fc_cmd *io_req)
{
	struct bnx2fc_mp_req *mp_req = &(io_req->mp_req);
	struct bnx2fc_interface *interface = io_req->port->priv;
	struct bnx2fc_hba *hba = interface->hba;
	size_t sz = sizeof(struct fcoe_bd_ctx);

	/* clear tm flags */
	mp_req->tm_flags = 0;
	if (mp_req->mp_req_bd) {
		dma_free_coherent(&hba->pcidev->dev, sz,
				     mp_req->mp_req_bd,
				     mp_req->mp_req_bd_dma);
		mp_req->mp_req_bd = NULL;
	}
	if (mp_req->mp_resp_bd) {
		dma_free_coherent(&hba->pcidev->dev, sz,
				     mp_req->mp_resp_bd,
				     mp_req->mp_resp_bd_dma);
		mp_req->mp_resp_bd = NULL;
	}
	if (mp_req->req_buf) {
		dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
				     mp_req->req_buf,
				     mp_req->req_buf_dma);
		mp_req->req_buf = NULL;
	}
	if (mp_req->resp_buf) {
		dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
				     mp_req->resp_buf,
				     mp_req->resp_buf_dma);
		mp_req->resp_buf = NULL;
	}
}

int bnx2fc_init_mp_req(struct bnx2fc_cmd *io_req)
{
	struct bnx2fc_mp_req *mp_req;
	struct fcoe_bd_ctx *mp_req_bd;
	struct fcoe_bd_ctx *mp_resp_bd;
	struct bnx2fc_interface *interface = io_req->port->priv;
	struct bnx2fc_hba *hba = interface->hba;
	dma_addr_t addr;
	size_t sz;

	mp_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
	memset(mp_req, 0, sizeof(struct bnx2fc_mp_req));

	mp_req->req_len = sizeof(struct fcp_cmnd);
	io_req->data_xfer_len = mp_req->req_len;
	mp_req->req_buf = dma_alloc_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
					     &mp_req->req_buf_dma,
					     GFP_ATOMIC);
	if (!mp_req->req_buf) {
		printk(KERN_ERR PFX "unable to alloc MP req buffer\n");
		bnx2fc_free_mp_resc(io_req);
		return FAILED;
	}

	mp_req->resp_buf = dma_alloc_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
					      &mp_req->resp_buf_dma,
					      GFP_ATOMIC);
	if (!mp_req->resp_buf) {
		printk(KERN_ERR PFX "unable to alloc TM resp buffer\n");
		bnx2fc_free_mp_resc(io_req);
		return FAILED;
	}
	memset(mp_req->req_buf, 0, CNIC_PAGE_SIZE);
	memset(mp_req->resp_buf, 0, CNIC_PAGE_SIZE);

	/* Allocate and map mp_req_bd and mp_resp_bd */
	sz = sizeof(struct fcoe_bd_ctx);
	mp_req->mp_req_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
						 &mp_req->mp_req_bd_dma,
						 GFP_ATOMIC);
	if (!mp_req->mp_req_bd) {
		printk(KERN_ERR PFX "unable to alloc MP req bd\n");
		bnx2fc_free_mp_resc(io_req);
		return FAILED;
	}
	mp_req->mp_resp_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
						 &mp_req->mp_resp_bd_dma,
						 GFP_ATOMIC);
	if (!mp_req->mp_resp_bd) {
		printk(KERN_ERR PFX "unable to alloc MP resp bd\n");
		bnx2fc_free_mp_resc(io_req);
		return FAILED;
	}
	/* Fill bd table */
	addr = mp_req->req_buf_dma;
	mp_req_bd = mp_req->mp_req_bd;
	mp_req_bd->buf_addr_lo = (u32)addr & 0xffffffff;
	mp_req_bd->buf_addr_hi = (u32)((u64)addr >> 32);
	mp_req_bd->buf_len = CNIC_PAGE_SIZE;
	mp_req_bd->flags = 0;

	/*
	 * MP buffer is either a task mgmt command or an ELS.
	 * So the assumption is that it consumes a single bd
	 * entry in the bd table
	 */
	mp_resp_bd = mp_req->mp_resp_bd;
	addr = mp_req->resp_buf_dma;
	mp_resp_bd->buf_addr_lo = (u32)addr & 0xffffffff;
	mp_resp_bd->buf_addr_hi = (u32)((u64)addr >> 32);
	mp_resp_bd->buf_len = CNIC_PAGE_SIZE;
	mp_resp_bd->flags = 0;

	return SUCCESS;
}

static int bnx2fc_initiate_tmf(struct scsi_cmnd *sc_cmd, u8 tm_flags)
{
	struct fc_lport *lport;
	struct fc_rport *rport;
	struct fc_rport_libfc_priv *rp;
	struct fcoe_port *port;
	struct bnx2fc_interface *interface;
	struct bnx2fc_rport *tgt;
	struct bnx2fc_cmd *io_req;
	struct bnx2fc_mp_req *tm_req;
	struct fcoe_task_ctx_entry *task;
	struct fcoe_task_ctx_entry *task_page;
	struct Scsi_Host *host = sc_cmd->device->host;
	struct fc_frame_header *fc_hdr;
	struct fcp_cmnd *fcp_cmnd;
	int task_idx, index;
	int rc = SUCCESS;
	u16 xid;
	u32 sid, did;
	unsigned long start = jiffies;

	lport = shost_priv(host);
	rport = starget_to_rport(scsi_target(sc_cmd->device));
	port = lport_priv(lport);
	interface = port->priv;

	if (rport == NULL) {
		printk(KERN_ERR PFX "device_reset: rport is NULL\n");
		rc = FAILED;
		goto tmf_err;
	}
	rp = rport->dd_data;

	rc = fc_block_scsi_eh(sc_cmd);
	if (rc)
		return rc;

	if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
		printk(KERN_ERR PFX "device_reset: link is not ready\n");
		rc = FAILED;
		goto tmf_err;
	}
	/* rport and tgt are allocated together, so tgt should be non-NULL */
	tgt = (struct bnx2fc_rport *)&rp[1];

	if (!(test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags))) {
		printk(KERN_ERR PFX "device_reset: tgt not offloaded\n");
		rc = FAILED;
		goto tmf_err;
	}
retry_tmf:
	io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_TASK_MGMT_CMD);
	if (!io_req) {
		if (time_after(jiffies, start + HZ)) {
			printk(KERN_ERR PFX "tmf: Failed TMF");
			rc = FAILED;
			goto tmf_err;
		}
		msleep(20);
		goto retry_tmf;
	}
	/* Initialize rest of io_req fields */
	io_req->sc_cmd = sc_cmd;
	io_req->port = port;
	io_req->tgt = tgt;

	tm_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);

	rc = bnx2fc_init_mp_req(io_req);
	if (rc == FAILED) {
		printk(KERN_ERR PFX "Task mgmt MP request init failed\n");
		spin_lock_bh(&tgt->tgt_lock);
		kref_put(&io_req->refcount, bnx2fc_cmd_release);
		spin_unlock_bh(&tgt->tgt_lock);
		goto tmf_err;
	}

	/* Set TM flags */
	io_req->io_req_flags = 0;
	tm_req->tm_flags = tm_flags;

	/* Fill FCP_CMND */
	bnx2fc_build_fcp_cmnd(io_req, (struct fcp_cmnd *)tm_req->req_buf);
	fcp_cmnd = (struct fcp_cmnd *)tm_req->req_buf;
	memset(fcp_cmnd->fc_cdb, 0,  sc_cmd->cmd_len);
	fcp_cmnd->fc_dl = 0;

	/* Fill FC header */
	fc_hdr = &(tm_req->req_fc_hdr);
	sid = tgt->sid;
	did = rport->port_id;
	__fc_fill_fc_hdr(fc_hdr, FC_RCTL_DD_UNSOL_CMD, did, sid,
			   FC_TYPE_FCP, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
			   FC_FC_SEQ_INIT, 0);
	/* Obtain exchange id */
	xid = io_req->xid;

	BNX2FC_TGT_DBG(tgt, "Initiate TMF - xid = 0x%x\n", xid);
	task_idx = xid/BNX2FC_TASKS_PER_PAGE;
	index = xid % BNX2FC_TASKS_PER_PAGE;

	/* Initialize task context for this IO request */
	task_page = (struct fcoe_task_ctx_entry *)
			interface->hba->task_ctx[task_idx];
	task = &(task_page[index]);
	bnx2fc_init_mp_task(io_req, task);

	sc_cmd->SCp.ptr = (char *)io_req;

	/* Obtain free SQ entry */
	spin_lock_bh(&tgt->tgt_lock);
	bnx2fc_add_2_sq(tgt, xid);

	/* Enqueue the io_req to active_tm_queue */
	io_req->on_tmf_queue = 1;
	list_add_tail(&io_req->link, &tgt->active_tm_queue);

	init_completion(&io_req->tm_done);
	io_req->wait_for_comp = 1;

	/* Ring doorbell */
	bnx2fc_ring_doorbell(tgt);
	spin_unlock_bh(&tgt->tgt_lock);

	rc = wait_for_completion_timeout(&io_req->tm_done,
					 BNX2FC_TM_TIMEOUT * HZ);
	spin_lock_bh(&tgt->tgt_lock);

	io_req->wait_for_comp = 0;
	if (!(test_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags))) {
		set_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags);
		if (io_req->on_tmf_queue) {
			list_del_init(&io_req->link);
			io_req->on_tmf_queue = 0;
		}
		io_req->wait_for_comp = 1;
		bnx2fc_initiate_cleanup(io_req);
		spin_unlock_bh(&tgt->tgt_lock);
		rc = wait_for_completion_timeout(&io_req->tm_done,
						 BNX2FC_FW_TIMEOUT);
		spin_lock_bh(&tgt->tgt_lock);
		io_req->wait_for_comp = 0;
		if (!rc)
			kref_put(&io_req->refcount, bnx2fc_cmd_release);
	}

	spin_unlock_bh(&tgt->tgt_lock);

	if (!rc) {
		BNX2FC_TGT_DBG(tgt, "task mgmt command failed...\n");
		rc = FAILED;
	} else {
		BNX2FC_TGT_DBG(tgt, "task mgmt command success...\n");
		rc = SUCCESS;
	}
tmf_err:
	return rc;
}

int bnx2fc_initiate_abts(struct bnx2fc_cmd *io_req)
{
	struct fc_lport *lport;
	struct bnx2fc_rport *tgt = io_req->tgt;
	struct fc_rport *rport = tgt->rport;
	struct fc_rport_priv *rdata = tgt->rdata;
	struct bnx2fc_interface *interface;
	struct fcoe_port *port;
	struct bnx2fc_cmd *abts_io_req;
	struct fcoe_task_ctx_entry *task;
	struct fcoe_task_ctx_entry *task_page;
	struct fc_frame_header *fc_hdr;
	struct bnx2fc_mp_req *abts_req;
	int task_idx, index;
	u32 sid, did;
	u16 xid;
	int rc = SUCCESS;
	u32 r_a_tov = rdata->r_a_tov;

	/* called with tgt_lock held */
	BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_abts\n");

	port = io_req->port;
	interface = port->priv;
	lport = port->lport;

	if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
		printk(KERN_ERR PFX "initiate_abts: tgt not offloaded\n");
		rc = FAILED;
		goto abts_err;
	}

	if (rport == NULL) {
		printk(KERN_ERR PFX "initiate_abts: rport is NULL\n");
		rc = FAILED;
		goto abts_err;
	}

	if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
		printk(KERN_ERR PFX "initiate_abts: link is not ready\n");
		rc = FAILED;
		goto abts_err;
	}

	abts_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_ABTS);
	if (!abts_io_req) {
		printk(KERN_ERR PFX "abts: couldnt allocate cmd\n");
		rc = FAILED;
		goto abts_err;
	}

	/* Initialize rest of io_req fields */
	abts_io_req->sc_cmd = NULL;
	abts_io_req->port = port;
	abts_io_req->tgt = tgt;
	abts_io_req->data_xfer_len = 0; /* No data transfer for ABTS */

	abts_req = (struct bnx2fc_mp_req *)&(abts_io_req->mp_req);
	memset(abts_req, 0, sizeof(struct bnx2fc_mp_req));

	/* Fill FC header */
	fc_hdr = &(abts_req->req_fc_hdr);

	/* Obtain oxid and rxid for the original exchange to be aborted */
	fc_hdr->fh_ox_id = htons(io_req->xid);
	fc_hdr->fh_rx_id = htons(io_req->task->rxwr_txrd.var_ctx.rx_id);

	sid = tgt->sid;
	did = rport->port_id;

	__fc_fill_fc_hdr(fc_hdr, FC_RCTL_BA_ABTS, did, sid,
			   FC_TYPE_BLS, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
			   FC_FC_SEQ_INIT, 0);

	xid = abts_io_req->xid;
	BNX2FC_IO_DBG(abts_io_req, "ABTS io_req\n");
	task_idx = xid/BNX2FC_TASKS_PER_PAGE;
	index = xid % BNX2FC_TASKS_PER_PAGE;

	/* Initialize task context for this IO request */
	task_page = (struct fcoe_task_ctx_entry *)
			interface->hba->task_ctx[task_idx];
	task = &(task_page[index]);
	bnx2fc_init_mp_task(abts_io_req, task);

	/*
	 * ABTS task is a temporary task that will be cleaned up
	 * irrespective of ABTS response. We need to start the timer
	 * for the original exchange, as the CQE is posted for the original
	 * IO request.
	 *
	 * Timer for ABTS is started only when it is originated by a
	 * TM request. For the ABTS issued as part of ULP timeout,
	 * scsi-ml maintains the timers.
	 */

	/* if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))*/
	bnx2fc_cmd_timer_set(io_req, 2 * r_a_tov);

	/* Obtain free SQ entry */
	bnx2fc_add_2_sq(tgt, xid);

	/* Ring doorbell */
	bnx2fc_ring_doorbell(tgt);

abts_err:
	return rc;
}

int bnx2fc_initiate_seq_cleanup(struct bnx2fc_cmd *orig_io_req, u32 offset,
				enum fc_rctl r_ctl)
{
	struct fc_lport *lport;
	struct bnx2fc_rport *tgt = orig_io_req->tgt;
	struct bnx2fc_interface *interface;
	struct fcoe_port *port;
	struct bnx2fc_cmd *seq_clnp_req;
	struct fcoe_task_ctx_entry *task;
	struct fcoe_task_ctx_entry *task_page;
	struct bnx2fc_els_cb_arg *cb_arg = NULL;
	int task_idx, index;
	u16 xid;
	int rc = 0;

	BNX2FC_IO_DBG(orig_io_req, "bnx2fc_initiate_seq_cleanup xid = 0x%x\n",
		   orig_io_req->xid);
	kref_get(&orig_io_req->refcount);

	port = orig_io_req->port;
	interface = port->priv;
	lport = port->lport;

	cb_arg = kzalloc(sizeof(struct bnx2fc_els_cb_arg), GFP_ATOMIC);
	if (!cb_arg) {
		printk(KERN_ERR PFX "Unable to alloc cb_arg for seq clnup\n");
		rc = -ENOMEM;
		goto cleanup_err;
	}

	seq_clnp_req = bnx2fc_elstm_alloc(tgt, BNX2FC_SEQ_CLEANUP);
	if (!seq_clnp_req) {
		printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
		rc = -ENOMEM;
		kfree(cb_arg);
		goto cleanup_err;
	}
	/* Initialize rest of io_req fields */
	seq_clnp_req->sc_cmd = NULL;
	seq_clnp_req->port = port;
	seq_clnp_req->tgt = tgt;
	seq_clnp_req->data_xfer_len = 0; /* No data transfer for cleanup */

	xid = seq_clnp_req->xid;

	task_idx = xid/BNX2FC_TASKS_PER_PAGE;
	index = xid % BNX2FC_TASKS_PER_PAGE;

	/* Initialize task context for this IO request */
	task_page = (struct fcoe_task_ctx_entry *)
		     interface->hba->task_ctx[task_idx];
	task = &(task_page[index]);
	cb_arg->aborted_io_req = orig_io_req;
	cb_arg->io_req = seq_clnp_req;
	cb_arg->r_ctl = r_ctl;
	cb_arg->offset = offset;
	seq_clnp_req->cb_arg = cb_arg;

	printk(KERN_ERR PFX "call init_seq_cleanup_task\n");
	bnx2fc_init_seq_cleanup_task(seq_clnp_req, task, orig_io_req, offset);

	/* Obtain free SQ entry */
	bnx2fc_add_2_sq(tgt, xid);

	/* Ring doorbell */
	bnx2fc_ring_doorbell(tgt);
cleanup_err:
	return rc;
}

int bnx2fc_initiate_cleanup(struct bnx2fc_cmd *io_req)
{
	struct fc_lport *lport;
	struct bnx2fc_rport *tgt = io_req->tgt;
	struct bnx2fc_interface *interface;
	struct fcoe_port *port;
	struct bnx2fc_cmd *cleanup_io_req;
	struct fcoe_task_ctx_entry *task;
	struct fcoe_task_ctx_entry *task_page;
	int task_idx, index;
	u16 xid, orig_xid;
	int rc = 0;

	/* ASSUMPTION: called with tgt_lock held */
	BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_cleanup\n");

	port = io_req->port;
	interface = port->priv;
	lport = port->lport;

	cleanup_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_CLEANUP);
	if (!cleanup_io_req) {
		printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
		rc = -1;
		goto cleanup_err;
	}

	/* Initialize rest of io_req fields */
	cleanup_io_req->sc_cmd = NULL;
	cleanup_io_req->port = port;
	cleanup_io_req->tgt = tgt;
	cleanup_io_req->data_xfer_len = 0; /* No data transfer for cleanup */

	xid = cleanup_io_req->xid;

	task_idx = xid/BNX2FC_TASKS_PER_PAGE;
	index = xid % BNX2FC_TASKS_PER_PAGE;

	/* Initialize task context for this IO request */
	task_page = (struct fcoe_task_ctx_entry *)
			interface->hba->task_ctx[task_idx];
	task = &(task_page[index]);
	orig_xid = io_req->xid;

	BNX2FC_IO_DBG(io_req, "CLEANUP io_req xid = 0x%x\n", xid);

	bnx2fc_init_cleanup_task(cleanup_io_req, task, orig_xid);

	/* Obtain free SQ entry */
	bnx2fc_add_2_sq(tgt, xid);

	/* Ring doorbell */
	bnx2fc_ring_doorbell(tgt);

cleanup_err:
	return rc;
}

/**
 * bnx2fc_eh_target_reset: Reset a target
 *
 * @sc_cmd:	SCSI command
 *
 * Set from SCSI host template to send task mgmt command to the target
 *	and wait for the response
 */
int bnx2fc_eh_target_reset(struct scsi_cmnd *sc_cmd)
{
	return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_TGT_RESET);
}

/**
 * bnx2fc_eh_device_reset - Reset a single LUN
 *
 * @sc_cmd:	SCSI command
 *
 * Set from SCSI host template to send task mgmt command to the target
 *	and wait for the response
 */
int bnx2fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
{
	return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_LUN_RESET);
}

int bnx2fc_expl_logo(struct fc_lport *lport, struct bnx2fc_cmd *io_req)
{
	struct bnx2fc_rport *tgt = io_req->tgt;
	struct fc_rport_priv *rdata = tgt->rdata;
	int logo_issued;
	int rc = SUCCESS;
	int wait_cnt = 0;

	BNX2FC_IO_DBG(io_req, "Expl logo - tgt flags = 0x%lx\n",
		      tgt->flags);
	logo_issued = test_and_set_bit(BNX2FC_FLAG_EXPL_LOGO,
				       &tgt->flags);
	io_req->wait_for_comp = 1;
	bnx2fc_initiate_cleanup(io_req);

	spin_unlock_bh(&tgt->tgt_lock);

	wait_for_completion(&io_req->tm_done);

	io_req->wait_for_comp = 0;
	/*
	 * release the reference taken in eh_abort to allow the
	 * target to re-login after flushing IOs
	 */
	 kref_put(&io_req->refcount, bnx2fc_cmd_release);

	if (!logo_issued) {
		clear_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags);
		mutex_lock(&lport->disc.disc_mutex);
		lport->tt.rport_logoff(rdata);
		mutex_unlock(&lport->disc.disc_mutex);
		do {
			msleep(BNX2FC_RELOGIN_WAIT_TIME);
			if (wait_cnt++ > BNX2FC_RELOGIN_WAIT_CNT) {
				rc = FAILED;
				break;
			}
		} while (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags));
	}
	spin_lock_bh(&tgt->tgt_lock);
	return rc;
}
/**
 * bnx2fc_eh_abort - eh_abort_handler api to abort an outstanding
 *			SCSI command
 *
 * @sc_cmd:	SCSI_ML command pointer
 *
 * SCSI abort request handler
 */
int bnx2fc_eh_abort(struct scsi_cmnd *sc_cmd)
{
	struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
	struct fc_rport_libfc_priv *rp = rport->dd_data;
	struct bnx2fc_cmd *io_req;
	struct fc_lport *lport;
	struct bnx2fc_rport *tgt;
	int rc = FAILED;


	rc = fc_block_scsi_eh(sc_cmd);
	if (rc)
		return rc;

	lport = shost_priv(sc_cmd->device->host);
	if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
		printk(KERN_ERR PFX "eh_abort: link not ready\n");
		return rc;
	}

	tgt = (struct bnx2fc_rport *)&rp[1];

	BNX2FC_TGT_DBG(tgt, "Entered bnx2fc_eh_abort\n");

	spin_lock_bh(&tgt->tgt_lock);
	io_req = (struct bnx2fc_cmd *)sc_cmd->SCp.ptr;
	if (!io_req) {
		/* Command might have just completed */
		printk(KERN_ERR PFX "eh_abort: io_req is NULL\n");
		spin_unlock_bh(&tgt->tgt_lock);
		return SUCCESS;
	}
	BNX2FC_IO_DBG(io_req, "eh_abort - refcnt = %d\n",
		      io_req->refcount.refcount.counter);

	/* Hold IO request across abort processing */
	kref_get(&io_req->refcount);

	BUG_ON(tgt != io_req->tgt);

	/* Remove the io_req from the active_q. */
	/*
	 * Task Mgmt functions (LUN RESET & TGT RESET) will not
	 * issue an ABTS on this particular IO req, as the
	 * io_req is no longer in the active_q.
	 */
	if (tgt->flush_in_prog) {
		printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
			"flush in progress\n", io_req->xid);
		kref_put(&io_req->refcount, bnx2fc_cmd_release);
		spin_unlock_bh(&tgt->tgt_lock);
		return SUCCESS;
	}

	if (io_req->on_active_queue == 0) {
		printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
				"not on active_q\n", io_req->xid);
		/*
		 * This condition can happen only due to the FW bug,
		 * where we do not receive cleanup response from
		 * the FW. Handle this case gracefully by erroring
		 * back the IO request to SCSI-ml
		 */
		bnx2fc_scsi_done(io_req, DID_ABORT);

		kref_put(&io_req->refcount, bnx2fc_cmd_release);
		spin_unlock_bh(&tgt->tgt_lock);
		return SUCCESS;
	}

	/*
	 * Only eh_abort processing will remove the IO from
	 * active_cmd_q before processing the request. this is
	 * done to avoid race conditions between IOs aborted
	 * as part of task management completion and eh_abort
	 * processing
	 */
	list_del_init(&io_req->link);
	io_req->on_active_queue = 0;
	/* Move IO req to retire queue */
	list_add_tail(&io_req->link, &tgt->io_retire_queue);

	init_completion(&io_req->tm_done);

	if (test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
		printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
				"already in abts processing\n", io_req->xid);
		if (cancel_delayed_work(&io_req->timeout_work))
			kref_put(&io_req->refcount,
				 bnx2fc_cmd_release); /* drop timer hold */
		rc = bnx2fc_expl_logo(lport, io_req);
		/* This only occurs when an task abort was requested while ABTS
		   is in progress.  Setting the IO_CLEANUP flag will skip the
		   RRQ process in the case when the fw generated SCSI_CMD cmpl
		   was a result from the ABTS request rather than the CLEANUP
		   request */
		set_bit(BNX2FC_FLAG_IO_CLEANUP,	&io_req->req_flags);
		goto out;
	}

	/* Cancel the current timer running on this io_req */
	if (cancel_delayed_work(&io_req->timeout_work))
		kref_put(&io_req->refcount,
			 bnx2fc_cmd_release); /* drop timer hold */
	set_bit(BNX2FC_FLAG_EH_ABORT, &io_req->req_flags);
	io_req->wait_for_comp = 1;
	rc = bnx2fc_initiate_abts(io_req);
	if (rc == FAILED) {
		bnx2fc_initiate_cleanup(io_req);
		spin_unlock_bh(&tgt->tgt_lock);
		wait_for_completion(&io_req->tm_done);
		spin_lock_bh(&tgt->tgt_lock);
		io_req->wait_for_comp = 0;
		goto done;
	}
	spin_unlock_bh(&tgt->tgt_lock);

	wait_for_completion(&io_req->tm_done);

	spin_lock_bh(&tgt->tgt_lock);
	io_req->wait_for_comp = 0;
	if (test_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
		BNX2FC_IO_DBG(io_req, "IO completed in a different context\n");
		rc = SUCCESS;
	} else if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
				      &io_req->req_flags))) {
		/* Let the scsi-ml try to recover this command */
		printk(KERN_ERR PFX "abort failed, xid = 0x%x\n",
		       io_req->xid);
		rc = bnx2fc_expl_logo(lport, io_req);
		goto out;
	} else {
		/*
		 * We come here even when there was a race condition
		 * between timeout and abts completion, and abts
		 * completion happens just in time.
		 */
		BNX2FC_IO_DBG(io_req, "abort succeeded\n");
		rc = SUCCESS;
		bnx2fc_scsi_done(io_req, DID_ABORT);
		kref_put(&io_req->refcount, bnx2fc_cmd_release);
	}
done:
	/* release the reference taken in eh_abort */
	kref_put(&io_req->refcount, bnx2fc_cmd_release);
out:
	spin_unlock_bh(&tgt->tgt_lock);
	return rc;
}

void bnx2fc_process_seq_cleanup_compl(struct bnx2fc_cmd *seq_clnp_req,
				      struct fcoe_task_ctx_entry *task,
				      u8 rx_state)
{
	struct bnx2fc_els_cb_arg *cb_arg = seq_clnp_req->cb_arg;
	struct bnx2fc_cmd *orig_io_req = cb_arg->aborted_io_req;
	u32 offset = cb_arg->offset;
	enum fc_rctl r_ctl = cb_arg->r_ctl;
	int rc = 0;
	struct bnx2fc_rport *tgt = orig_io_req->tgt;

	BNX2FC_IO_DBG(orig_io_req, "Entered process_cleanup_compl xid = 0x%x"
			      "cmd_type = %d\n",
		   seq_clnp_req->xid, seq_clnp_req->cmd_type);

	if (rx_state == FCOE_TASK_RX_STATE_IGNORED_SEQUENCE_CLEANUP) {
		printk(KERN_ERR PFX "seq cleanup ignored - xid = 0x%x\n",
			seq_clnp_req->xid);
		goto free_cb_arg;
	}

	spin_unlock_bh(&tgt->tgt_lock);
	rc = bnx2fc_send_srr(orig_io_req, offset, r_ctl);
	spin_lock_bh(&tgt->tgt_lock);

	if (rc)
		printk(KERN_ERR PFX "clnup_compl: Unable to send SRR"
			" IO will abort\n");
	seq_clnp_req->cb_arg = NULL;
	kref_put(&orig_io_req->refcount, bnx2fc_cmd_release);
free_cb_arg:
	kfree(cb_arg);
	return;
}

void bnx2fc_process_cleanup_compl(struct bnx2fc_cmd *io_req,
				  struct fcoe_task_ctx_entry *task,
				  u8 num_rq)
{
	BNX2FC_IO_DBG(io_req, "Entered process_cleanup_compl "
			      "refcnt = %d, cmd_type = %d\n",
		   io_req->refcount.refcount.counter, io_req->cmd_type);
	bnx2fc_scsi_done(io_req, DID_ERROR);
	kref_put(&io_req->refcount, bnx2fc_cmd_release);
	if (io_req->wait_for_comp)
		complete(&io_req->tm_done);
}

void bnx2fc_process_abts_compl(struct bnx2fc_cmd *io_req,
			       struct fcoe_task_ctx_entry *task,
			       u8 num_rq)
{
	u32 r_ctl;
	u32 r_a_tov = FC_DEF_R_A_TOV;
	u8 issue_rrq = 0;
	struct bnx2fc_rport *tgt = io_req->tgt;

	BNX2FC_IO_DBG(io_req, "Entered process_abts_compl xid = 0x%x"
			      "refcnt = %d, cmd_type = %d\n",
		   io_req->xid,
		   io_req->refcount.refcount.counter, io_req->cmd_type);

	if (test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
				       &io_req->req_flags)) {
		BNX2FC_IO_DBG(io_req, "Timer context finished processing"
				" this io\n");
		return;
	}

	/* Do not issue RRQ as this IO is already cleanedup */
	if (test_and_set_bit(BNX2FC_FLAG_IO_CLEANUP,
				&io_req->req_flags))
		goto io_compl;

	/*
	 * For ABTS issued due to SCSI eh_abort_handler, timeout
	 * values are maintained by scsi-ml itself. Cancel timeout
	 * in case ABTS issued as part of task management function
	 * or due to FW error.
	 */
	if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))
		if (cancel_delayed_work(&io_req->timeout_work))
			kref_put(&io_req->refcount,
				 bnx2fc_cmd_release); /* drop timer hold */

	r_ctl = (u8)task->rxwr_only.union_ctx.comp_info.abts_rsp.r_ctl;

	switch (r_ctl) {
	case FC_RCTL_BA_ACC:
		/*
		 * Dont release this cmd yet. It will be relesed
		 * after we get RRQ response
		 */
		BNX2FC_IO_DBG(io_req, "ABTS response - ACC Send RRQ\n");
		issue_rrq = 1;
		break;

	case FC_RCTL_BA_RJT:
		BNX2FC_IO_DBG(io_req, "ABTS response - RJT\n");
		break;
	default:
		printk(KERN_ERR PFX "Unknown ABTS response\n");
		break;
	}

	if (issue_rrq) {
		BNX2FC_IO_DBG(io_req, "Issue RRQ after R_A_TOV\n");
		set_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags);
	}
	set_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
	bnx2fc_cmd_timer_set(io_req, r_a_tov);

io_compl:
	if (io_req->wait_for_comp) {
		if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
				       &io_req->req_flags))
			complete(&io_req->tm_done);
	} else {
		/*
		 * We end up here when ABTS is issued as
		 * in asynchronous context, i.e., as part
		 * of task management completion, or
		 * when FW error is received or when the
		 * ABTS is issued when the IO is timed
		 * out.
		 */

		if (io_req->on_active_queue) {
			list_del_init(&io_req->link);
			io_req->on_active_queue = 0;
			/* Move IO req to retire queue */
			list_add_tail(&io_req->link, &tgt->io_retire_queue);
		}
		bnx2fc_scsi_done(io_req, DID_ERROR);
		kref_put(&io_req->refcount, bnx2fc_cmd_release);
	}
}

static void bnx2fc_lun_reset_cmpl(struct bnx2fc_cmd *io_req)
{
	struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
	struct bnx2fc_rport *tgt = io_req->tgt;
	struct bnx2fc_cmd *cmd, *tmp;
	u64 tm_lun = sc_cmd->device->lun;
	u64 lun;
	int rc = 0;

	/* called with tgt_lock held */
	BNX2FC_IO_DBG(io_req, "Entered bnx2fc_lun_reset_cmpl\n");
	/*
	 * Walk thru the active_ios queue and ABORT the IO
	 * that matches with the LUN that was reset
	 */
	list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
		BNX2FC_TGT_DBG(tgt, "LUN RST cmpl: scan for pending IOs\n");
		lun = cmd->sc_cmd->device->lun;
		if (lun == tm_lun) {
			/* Initiate ABTS on this cmd */
			if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
					      &cmd->req_flags)) {
				/* cancel the IO timeout */
				if (cancel_delayed_work(&io_req->timeout_work))
					kref_put(&io_req->refcount,
						 bnx2fc_cmd_release);
							/* timer hold */
				rc = bnx2fc_initiate_abts(cmd);
				/* abts shouldn't fail in this context */
				WARN_ON(rc != SUCCESS);
			} else
				printk(KERN_ERR PFX "lun_rst: abts already in"
					" progress for this IO 0x%x\n",
					cmd->xid);
		}
	}
}

static void bnx2fc_tgt_reset_cmpl(struct bnx2fc_cmd *io_req)
{
	struct bnx2fc_rport *tgt = io_req->tgt;
	struct bnx2fc_cmd *cmd, *tmp;
	int rc = 0;

	/* called with tgt_lock held */
	BNX2FC_IO_DBG(io_req, "Entered bnx2fc_tgt_reset_cmpl\n");
	/*
	 * Walk thru the active_ios queue and ABORT the IO
	 * that matches with the LUN that was reset
	 */
	list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
		BNX2FC_TGT_DBG(tgt, "TGT RST cmpl: scan for pending IOs\n");
		/* Initiate ABTS */
		if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
							&cmd->req_flags)) {
			/* cancel the IO timeout */
			if (cancel_delayed_work(&io_req->timeout_work))
				kref_put(&io_req->refcount,
					 bnx2fc_cmd_release); /* timer hold */
			rc = bnx2fc_initiate_abts(cmd);
			/* abts shouldn't fail in this context */
			WARN_ON(rc != SUCCESS);

		} else
			printk(KERN_ERR PFX "tgt_rst: abts already in progress"
				" for this IO 0x%x\n", cmd->xid);
	}
}

void bnx2fc_process_tm_compl(struct bnx2fc_cmd *io_req,
			     struct fcoe_task_ctx_entry *task, u8 num_rq)
{
	struct bnx2fc_mp_req *tm_req;
	struct fc_frame_header *fc_hdr;
	struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
	u64 *hdr;
	u64 *temp_hdr;
	void *rsp_buf;

	/* Called with tgt_lock held */
	BNX2FC_IO_DBG(io_req, "Entered process_tm_compl\n");

	if (!(test_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags)))
		set_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags);
	else {
		/* TM has already timed out and we got
		 * delayed completion. Ignore completion
		 * processing.
		 */
		return;
	}

	tm_req = &(io_req->mp_req);
	fc_hdr = &(tm_req->resp_fc_hdr);
	hdr = (u64 *)fc_hdr;
	temp_hdr = (u64 *)
		&task->rxwr_only.union_ctx.comp_info.mp_rsp.fc_hdr;
	hdr[0] = cpu_to_be64(temp_hdr[0]);
	hdr[1] = cpu_to_be64(temp_hdr[1]);
	hdr[2] = cpu_to_be64(temp_hdr[2]);

	tm_req->resp_len =
		task->rxwr_only.union_ctx.comp_info.mp_rsp.mp_payload_len;

	rsp_buf = tm_req->resp_buf;

	if (fc_hdr->fh_r_ctl == FC_RCTL_DD_CMD_STATUS) {
		bnx2fc_parse_fcp_rsp(io_req,
				     (struct fcoe_fcp_rsp_payload *)
				     rsp_buf, num_rq);
		if (io_req->fcp_rsp_code == 0) {
			/* TM successful */
			if (tm_req->tm_flags & FCP_TMF_LUN_RESET)
				bnx2fc_lun_reset_cmpl(io_req);
			else if (tm_req->tm_flags & FCP_TMF_TGT_RESET)
				bnx2fc_tgt_reset_cmpl(io_req);
		}
	} else {
		printk(KERN_ERR PFX "tmf's fc_hdr r_ctl = 0x%x\n",
			fc_hdr->fh_r_ctl);
	}
	if (!sc_cmd->SCp.ptr) {
		printk(KERN_ERR PFX "tm_compl: SCp.ptr is NULL\n");
		return;
	}
	switch (io_req->fcp_status) {
	case FC_GOOD:
		if (io_req->cdb_status == 0) {
			/* Good IO completion */
			sc_cmd->result = DID_OK << 16;
		} else {
			/* Transport status is good, SCSI status not good */
			sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
		}
		if (io_req->fcp_resid)
			scsi_set_resid(sc_cmd, io_req->fcp_resid);
		break;

	default:
		BNX2FC_IO_DBG(io_req, "process_tm_compl: fcp_status = %d\n",
			   io_req->fcp_status);
		break;
	}

	sc_cmd = io_req->sc_cmd;
	io_req->sc_cmd = NULL;

	/* check if the io_req exists in tgt's tmf_q */
	if (io_req->on_tmf_queue) {

		list_del_init(&io_req->link);
		io_req->on_tmf_queue = 0;
	} else {

		printk(KERN_ERR PFX "Command not on active_cmd_queue!\n");
		return;
	}

	sc_cmd->SCp.ptr = NULL;
	sc_cmd->scsi_done(sc_cmd);

	kref_put(&io_req->refcount, bnx2fc_cmd_release);
	if (io_req->wait_for_comp) {
		BNX2FC_IO_DBG(io_req, "tm_compl - wake up the waiter\n");
		complete(&io_req->tm_done);
	}
}

static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
			   int bd_index)
{
	struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
	int frag_size, sg_frags;

	sg_frags = 0;
	while (sg_len) {
		if (sg_len >= BNX2FC_BD_SPLIT_SZ)
			frag_size = BNX2FC_BD_SPLIT_SZ;
		else
			frag_size = sg_len;
		bd[bd_index + sg_frags].buf_addr_lo = addr & 0xffffffff;
		bd[bd_index + sg_frags].buf_addr_hi  = addr >> 32;
		bd[bd_index + sg_frags].buf_len = (u16)frag_size;
		bd[bd_index + sg_frags].flags = 0;

		addr += (u64) frag_size;
		sg_frags++;
		sg_len -= frag_size;
	}
	return sg_frags;

}

static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req)
{
	struct bnx2fc_interface *interface = io_req->port->priv;
	struct bnx2fc_hba *hba = interface->hba;
	struct scsi_cmnd *sc = io_req->sc_cmd;
	struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
	struct scatterlist *sg;
	int byte_count = 0;
	int sg_count = 0;
	int bd_count = 0;
	int sg_frags;
	unsigned int sg_len;
	u64 addr;
	int i;

	/*
	 * Use dma_map_sg directly to ensure we're using the correct
	 * dev struct off of pcidev.
	 */
	sg_count = dma_map_sg(&hba->pcidev->dev, scsi_sglist(sc),
			      scsi_sg_count(sc), sc->sc_data_direction);
	scsi_for_each_sg(sc, sg, sg_count, i) {
		sg_len = sg_dma_len(sg);
		addr = sg_dma_address(sg);
		if (sg_len > BNX2FC_MAX_BD_LEN) {
			sg_frags = bnx2fc_split_bd(io_req, addr, sg_len,
						   bd_count);
		} else {

			sg_frags = 1;
			bd[bd_count].buf_addr_lo = addr & 0xffffffff;
			bd[bd_count].buf_addr_hi  = addr >> 32;
			bd[bd_count].buf_len = (u16)sg_len;
			bd[bd_count].flags = 0;
		}
		bd_count += sg_frags;
		byte_count += sg_len;
	}
	if (byte_count != scsi_bufflen(sc))
		printk(KERN_ERR PFX "byte_count = %d != scsi_bufflen = %d, "
			"task_id = 0x%x\n", byte_count, scsi_bufflen(sc),
			io_req->xid);
	return bd_count;
}

static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req)
{
	struct scsi_cmnd *sc = io_req->sc_cmd;
	struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
	int bd_count;

	if (scsi_sg_count(sc)) {
		bd_count = bnx2fc_map_sg(io_req);
		if (bd_count == 0)
			return -ENOMEM;
	} else {
		bd_count = 0;
		bd[0].buf_addr_lo = bd[0].buf_addr_hi = 0;
		bd[0].buf_len = bd[0].flags = 0;
	}
	io_req->bd_tbl->bd_valid = bd_count;

	return 0;
}

static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req)
{
	struct scsi_cmnd *sc = io_req->sc_cmd;
	struct bnx2fc_interface *interface = io_req->port->priv;
	struct bnx2fc_hba *hba = interface->hba;

	/*
	 * Use dma_unmap_sg directly to ensure we're using the correct
	 * dev struct off of pcidev.
	 */
	if (io_req->bd_tbl->bd_valid && sc && scsi_sg_count(sc)) {
		dma_unmap_sg(&hba->pcidev->dev, scsi_sglist(sc),
		    scsi_sg_count(sc), sc->sc_data_direction);
		io_req->bd_tbl->bd_valid = 0;
	}
}

void bnx2fc_build_fcp_cmnd(struct bnx2fc_cmd *io_req,
				  struct fcp_cmnd *fcp_cmnd)
{
	struct scsi_cmnd *sc_cmd = io_req->sc_cmd;

	memset(fcp_cmnd, 0, sizeof(struct fcp_cmnd));

	int_to_scsilun(sc_cmd->device->lun, &fcp_cmnd->fc_lun);

	fcp_cmnd->fc_dl = htonl(io_req->data_xfer_len);
	memcpy(fcp_cmnd->fc_cdb, sc_cmd->cmnd, sc_cmd->cmd_len);

	fcp_cmnd->fc_cmdref = 0;
	fcp_cmnd->fc_pri_ta = 0;
	fcp_cmnd->fc_tm_flags = io_req->mp_req.tm_flags;
	fcp_cmnd->fc_flags = io_req->io_req_flags;
	fcp_cmnd->fc_pri_ta = FCP_PTA_SIMPLE;
}

static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
				 struct fcoe_fcp_rsp_payload *fcp_rsp,
				 u8 num_rq)
{
	struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
	struct bnx2fc_rport *tgt = io_req->tgt;
	u8 rsp_flags = fcp_rsp->fcp_flags.flags;
	u32 rq_buff_len = 0;
	int i;
	unsigned char *rq_data;
	unsigned char *dummy;
	int fcp_sns_len = 0;
	int fcp_rsp_len = 0;

	io_req->fcp_status = FC_GOOD;
	io_req->fcp_resid = fcp_rsp->fcp_resid;

	io_req->scsi_comp_flags = rsp_flags;
	CMD_SCSI_STATUS(sc_cmd) = io_req->cdb_status =
				fcp_rsp->scsi_status_code;

	/* Fetch fcp_rsp_info and fcp_sns_info if available */
	if (num_rq) {

		/*
		 * We do not anticipate num_rq >1, as the linux defined
		 * SCSI_SENSE_BUFFERSIZE is 96 bytes + 8 bytes of FCP_RSP_INFO
		 * 256 bytes of single rq buffer is good enough to hold this.
		 */

		if (rsp_flags &
		    FCOE_FCP_RSP_FLAGS_FCP_RSP_LEN_VALID) {
			fcp_rsp_len = rq_buff_len
					= fcp_rsp->fcp_rsp_len;
		}

		if (rsp_flags &
		    FCOE_FCP_RSP_FLAGS_FCP_SNS_LEN_VALID) {
			fcp_sns_len = fcp_rsp->fcp_sns_len;
			rq_buff_len += fcp_rsp->fcp_sns_len;
		}

		io_req->fcp_rsp_len = fcp_rsp_len;
		io_req->fcp_sns_len = fcp_sns_len;

		if (rq_buff_len > num_rq * BNX2FC_RQ_BUF_SZ) {
			/* Invalid sense sense length. */
			printk(KERN_ERR PFX "invalid sns length %d\n",
				rq_buff_len);
			/* reset rq_buff_len */
			rq_buff_len =  num_rq * BNX2FC_RQ_BUF_SZ;
		}

		rq_data = bnx2fc_get_next_rqe(tgt, 1);

		if (num_rq > 1) {
			/* We do not need extra sense data */
			for (i = 1; i < num_rq; i++)
				dummy = bnx2fc_get_next_rqe(tgt, 1);
		}

		/* fetch fcp_rsp_code */
		if ((fcp_rsp_len == 4) || (fcp_rsp_len == 8)) {
			/* Only for task management function */
			io_req->fcp_rsp_code = rq_data[3];
			printk(KERN_ERR PFX "fcp_rsp_code = %d\n",
				io_req->fcp_rsp_code);
		}

		/* fetch sense data */
		rq_data += fcp_rsp_len;

		if (fcp_sns_len > SCSI_SENSE_BUFFERSIZE) {
			printk(KERN_ERR PFX "Truncating sense buffer\n");
			fcp_sns_len = SCSI_SENSE_BUFFERSIZE;
		}

		memset(sc_cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
		if (fcp_sns_len)
			memcpy(sc_cmd->sense_buffer, rq_data, fcp_sns_len);

		/* return RQ entries */
		for (i = 0; i < num_rq; i++)
			bnx2fc_return_rqe(tgt, 1);
	}
}

/**
 * bnx2fc_queuecommand - Queuecommand function of the scsi template
 *
 * @host:	The Scsi_Host the command was issued to
 * @sc_cmd:	struct scsi_cmnd to be executed
 *
 * This is the IO strategy routine, called by SCSI-ML
 **/
int bnx2fc_queuecommand(struct Scsi_Host *host,
			struct scsi_cmnd *sc_cmd)
{
	struct fc_lport *lport = shost_priv(host);
	struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
	struct fc_rport_libfc_priv *rp = rport->dd_data;
	struct bnx2fc_rport *tgt;
	struct bnx2fc_cmd *io_req;
	int rc = 0;
	int rval;

	rval = fc_remote_port_chkready(rport);
	if (rval) {
		sc_cmd->result = rval;
		sc_cmd->scsi_done(sc_cmd);
		return 0;
	}

	if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
		rc = SCSI_MLQUEUE_HOST_BUSY;
		goto exit_qcmd;
	}

	/* rport and tgt are allocated together, so tgt should be non-NULL */
	tgt = (struct bnx2fc_rport *)&rp[1];

	if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
		/*
		 * Session is not offloaded yet. Let SCSI-ml retry
		 * the command.
		 */
		rc = SCSI_MLQUEUE_TARGET_BUSY;
		goto exit_qcmd;
	}
	if (tgt->retry_delay_timestamp) {
		if (time_after(jiffies, tgt->retry_delay_timestamp)) {
			tgt->retry_delay_timestamp = 0;
		} else {
			/* If retry_delay timer is active, flow off the ML */
			rc = SCSI_MLQUEUE_TARGET_BUSY;
			goto exit_qcmd;
		}
	}

	spin_lock_bh(&tgt->tgt_lock);

	io_req = bnx2fc_cmd_alloc(tgt);
	if (!io_req) {
		rc = SCSI_MLQUEUE_HOST_BUSY;
		goto exit_qcmd_tgtlock;
	}
	io_req->sc_cmd = sc_cmd;

	if (bnx2fc_post_io_req(tgt, io_req)) {
		printk(KERN_ERR PFX "Unable to post io_req\n");
		rc = SCSI_MLQUEUE_HOST_BUSY;
		goto exit_qcmd_tgtlock;
	}

exit_qcmd_tgtlock:
	spin_unlock_bh(&tgt->tgt_lock);
exit_qcmd:
	return rc;
}

void bnx2fc_process_scsi_cmd_compl(struct bnx2fc_cmd *io_req,
				   struct fcoe_task_ctx_entry *task,
				   u8 num_rq)
{
	struct fcoe_fcp_rsp_payload *fcp_rsp;
	struct bnx2fc_rport *tgt = io_req->tgt;
	struct scsi_cmnd *sc_cmd;
	struct Scsi_Host *host;


	/* scsi_cmd_cmpl is called with tgt lock held */

	if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
		/* we will not receive ABTS response for this IO */
		BNX2FC_IO_DBG(io_req, "Timer context finished processing "
			   "this scsi cmd\n");
	}

	/* Cancel the timeout_work, as we received IO completion */
	if (cancel_delayed_work(&io_req->timeout_work))
		kref_put(&io_req->refcount,
			 bnx2fc_cmd_release); /* drop timer hold */

	sc_cmd = io_req->sc_cmd;
	if (sc_cmd == NULL) {
		printk(KERN_ERR PFX "scsi_cmd_compl - sc_cmd is NULL\n");
		return;
	}

	/* Fetch fcp_rsp from task context and perform cmd completion */
	fcp_rsp = (struct fcoe_fcp_rsp_payload *)
		   &(task->rxwr_only.union_ctx.comp_info.fcp_rsp.payload);

	/* parse fcp_rsp and obtain sense data from RQ if available */
	bnx2fc_parse_fcp_rsp(io_req, fcp_rsp, num_rq);

	host = sc_cmd->device->host;
	if (!sc_cmd->SCp.ptr) {
		printk(KERN_ERR PFX "SCp.ptr is NULL\n");
		return;
	}

	if (io_req->on_active_queue) {
		list_del_init(&io_req->link);
		io_req->on_active_queue = 0;
		/* Move IO req to retire queue */
		list_add_tail(&io_req->link, &tgt->io_retire_queue);
	} else {
		/* This should not happen, but could have been pulled
		 * by bnx2fc_flush_active_ios(), or during a race
		 * between command abort and (late) completion.
		 */
		BNX2FC_IO_DBG(io_req, "xid not on active_cmd_queue\n");
		if (io_req->wait_for_comp)
			if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
					       &io_req->req_flags))
				complete(&io_req->tm_done);
	}

	bnx2fc_unmap_sg_list(io_req);
	io_req->sc_cmd = NULL;

	switch (io_req->fcp_status) {
	case FC_GOOD:
		if (io_req->cdb_status == 0) {
			/* Good IO completion */
			sc_cmd->result = DID_OK << 16;
		} else {
			/* Transport status is good, SCSI status not good */
			BNX2FC_IO_DBG(io_req, "scsi_cmpl: cdb_status = %d"
				 " fcp_resid = 0x%x\n",
				io_req->cdb_status, io_req->fcp_resid);
			sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;

			if (io_req->cdb_status == SAM_STAT_TASK_SET_FULL ||
			    io_req->cdb_status == SAM_STAT_BUSY) {
				/* Set the jiffies + retry_delay_timer * 100ms
				   for the rport/tgt */
				tgt->retry_delay_timestamp = jiffies +
					fcp_rsp->retry_delay_timer * HZ / 10;
			}

		}
		if (io_req->fcp_resid)
			scsi_set_resid(sc_cmd, io_req->fcp_resid);
		break;
	default:
		printk(KERN_ERR PFX "scsi_cmd_compl: fcp_status = %d\n",
			io_req->fcp_status);
		break;
	}
	sc_cmd->SCp.ptr = NULL;
	sc_cmd->scsi_done(sc_cmd);
	kref_put(&io_req->refcount, bnx2fc_cmd_release);
}

int bnx2fc_post_io_req(struct bnx2fc_rport *tgt,
			       struct bnx2fc_cmd *io_req)
{
	struct fcoe_task_ctx_entry *task;
	struct fcoe_task_ctx_entry *task_page;
	struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
	struct fcoe_port *port = tgt->port;
	struct bnx2fc_interface *interface = port->priv;
	struct bnx2fc_hba *hba = interface->hba;
	struct fc_lport *lport = port->lport;
	struct fc_stats *stats;
	int task_idx, index;
	u16 xid;

	/* bnx2fc_post_io_req() is called with the tgt_lock held */

	/* Initialize rest of io_req fields */
	io_req->cmd_type = BNX2FC_SCSI_CMD;
	io_req->port = port;
	io_req->tgt = tgt;
	io_req->data_xfer_len = scsi_bufflen(sc_cmd);
	sc_cmd->SCp.ptr = (char *)io_req;

	stats = per_cpu_ptr(lport->stats, get_cpu());
	if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
		io_req->io_req_flags = BNX2FC_READ;
		stats->InputRequests++;
		stats->InputBytes += io_req->data_xfer_len;
	} else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
		io_req->io_req_flags = BNX2FC_WRITE;
		stats->OutputRequests++;
		stats->OutputBytes += io_req->data_xfer_len;
	} else {
		io_req->io_req_flags = 0;
		stats->ControlRequests++;
	}
	put_cpu();

	xid = io_req->xid;

	/* Build buffer descriptor list for firmware from sg list */
	if (bnx2fc_build_bd_list_from_sg(io_req)) {
		printk(KERN_ERR PFX "BD list creation failed\n");
		kref_put(&io_req->refcount, bnx2fc_cmd_release);
		return -EAGAIN;
	}

	task_idx = xid / BNX2FC_TASKS_PER_PAGE;
	index = xid % BNX2FC_TASKS_PER_PAGE;

	/* Initialize task context for this IO request */
	task_page = (struct fcoe_task_ctx_entry *) hba->task_ctx[task_idx];
	task = &(task_page[index]);
	bnx2fc_init_task(io_req, task);

	if (tgt->flush_in_prog) {
		printk(KERN_ERR PFX "Flush in progress..Host Busy\n");
		kref_put(&io_req->refcount, bnx2fc_cmd_release);
		return -EAGAIN;
	}

	if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
		printk(KERN_ERR PFX "Session not ready...post_io\n");
		kref_put(&io_req->refcount, bnx2fc_cmd_release);
		return -EAGAIN;
	}

	/* Time IO req */
	if (tgt->io_timeout)
		bnx2fc_cmd_timer_set(io_req, BNX2FC_IO_TIMEOUT);
	/* Obtain free SQ entry */
	bnx2fc_add_2_sq(tgt, xid);

	/* Enqueue the io_req to active_cmd_queue */

	io_req->on_active_queue = 1;
	/* move io_req from pending_queue to active_queue */
	list_add_tail(&io_req->link, &tgt->active_cmd_queue);

	/* Ring doorbell */
	bnx2fc_ring_doorbell(tgt);
	return 0;
}