aboutsummaryrefslogblamecommitdiffstats
path: root/drivers/target/target_core_cdb.c
blob: 366080baf4743831883eba811cb61a54812e08c5 (plain) (tree)
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










































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































                                                                                   
/*
 * CDB emulation for non-READ/WRITE commands.
 *
 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
 * Copyright (c) 2007-2010 Rising Tide Systems
 * Copyright (c) 2008-2010 Linux-iSCSI.org
 *
 * Nicholas A. Bellinger <nab@kernel.org>
 *
 * 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.
 */

#include <asm/unaligned.h>
#include <scsi/scsi.h>

#include <target/target_core_base.h>
#include <target/target_core_transport.h>
#include <target/target_core_fabric_ops.h>
#include "target_core_ua.h"

static void
target_fill_alua_data(struct se_port *port, unsigned char *buf)
{
	struct t10_alua_tg_pt_gp *tg_pt_gp;
	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;

	/*
	 * Set SCCS for MAINTENANCE_IN + REPORT_TARGET_PORT_GROUPS.
	 */
	buf[5]	= 0x80;

	/*
	 * Set TPGS field for explict and/or implict ALUA access type
	 * and opteration.
	 *
	 * See spc4r17 section 6.4.2 Table 135
	 */
	if (!port)
		return;
	tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
	if (!tg_pt_gp_mem)
		return;

	spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
	tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
	if (tg_pt_gp)
		buf[5] |= tg_pt_gp->tg_pt_gp_alua_access_type;
	spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
}

static int
target_emulate_inquiry_std(struct se_cmd *cmd)
{
	struct se_lun *lun = SE_LUN(cmd);
	struct se_device *dev = SE_DEV(cmd);
	unsigned char *buf = cmd->t_task->t_task_buf;

	/*
	 * Make sure we at least have 6 bytes of INQUIRY response
	 * payload going back for EVPD=0
	 */
	if (cmd->data_length < 6) {
		printk(KERN_ERR "SCSI Inquiry payload length: %u"
			" too small for EVPD=0\n", cmd->data_length);
		return -1;
	}

	buf[0] = dev->transport->get_device_type(dev);
	if (buf[0] == TYPE_TAPE)
		buf[1] = 0x80;
	buf[2] = dev->transport->get_device_rev(dev);

	/*
	 * Enable SCCS and TPGS fields for Emulated ALUA
	 */
	if (T10_ALUA(dev->se_sub_dev)->alua_type == SPC3_ALUA_EMULATED)
		target_fill_alua_data(lun->lun_sep, buf);

	if (cmd->data_length < 8) {
		buf[4] = 1; /* Set additional length to 1 */
		return 0;
	}

	buf[7] = 0x32; /* Sync=1 and CmdQue=1 */

	/*
	 * Do not include vendor, product, reversion info in INQUIRY
	 * response payload for cdbs with a small allocation length.
	 */
	if (cmd->data_length < 36) {
		buf[4] = 3; /* Set additional length to 3 */
		return 0;
	}

	snprintf((unsigned char *)&buf[8], 8, "LIO-ORG");
	snprintf((unsigned char *)&buf[16], 16, "%s",
		 &DEV_T10_WWN(dev)->model[0]);
	snprintf((unsigned char *)&buf[32], 4, "%s",
		 &DEV_T10_WWN(dev)->revision[0]);
	buf[4] = 31; /* Set additional length to 31 */
	return 0;
}

/* supported vital product data pages */
static int
target_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf)
{
	buf[1] = 0x00;
	if (cmd->data_length < 8)
		return 0;

	buf[4] = 0x0;
	/*
	 * Only report the INQUIRY EVPD=1 pages after a valid NAA
	 * Registered Extended LUN WWN has been set via ConfigFS
	 * during device creation/restart.
	 */
	if (SE_DEV(cmd)->se_sub_dev->su_dev_flags &
			SDF_EMULATED_VPD_UNIT_SERIAL) {
		buf[3] = 3;
		buf[5] = 0x80;
		buf[6] = 0x83;
		buf[7] = 0x86;
	}

	return 0;
}

/* unit serial number */
static int
target_emulate_evpd_80(struct se_cmd *cmd, unsigned char *buf)
{
	struct se_device *dev = SE_DEV(cmd);
	u16 len = 0;

	buf[1] = 0x80;
	if (dev->se_sub_dev->su_dev_flags &
			SDF_EMULATED_VPD_UNIT_SERIAL) {
		u32 unit_serial_len;

		unit_serial_len =
			strlen(&DEV_T10_WWN(dev)->unit_serial[0]);
		unit_serial_len++; /* For NULL Terminator */

		if (((len + 4) + unit_serial_len) > cmd->data_length) {
			len += unit_serial_len;
			buf[2] = ((len >> 8) & 0xff);
			buf[3] = (len & 0xff);
			return 0;
		}
		len += sprintf((unsigned char *)&buf[4], "%s",
			&DEV_T10_WWN(dev)->unit_serial[0]);
		len++; /* Extra Byte for NULL Terminator */
		buf[3] = len;
	}
	return 0;
}

/*
 * Device identification VPD, for a complete list of
 * DESIGNATOR TYPEs see spc4r17 Table 459.
 */
static int
target_emulate_evpd_83(struct se_cmd *cmd, unsigned char *buf)
{
	struct se_device *dev = SE_DEV(cmd);
	struct se_lun *lun = SE_LUN(cmd);
	struct se_port *port = NULL;
	struct se_portal_group *tpg = NULL;
	struct t10_alua_lu_gp_member *lu_gp_mem;
	struct t10_alua_tg_pt_gp *tg_pt_gp;
	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
	unsigned char binary, binary_new;
	unsigned char *prod = &DEV_T10_WWN(dev)->model[0];
	u32 prod_len;
	u32 unit_serial_len, off = 0;
	int i;
	u16 len = 0, id_len;

	buf[1] = 0x83;
	off = 4;

	/*
	 * NAA IEEE Registered Extended Assigned designator format, see
	 * spc4r17 section 7.7.3.6.5
	 *
	 * We depend upon a target_core_mod/ConfigFS provided
	 * /sys/kernel/config/target/core/$HBA/$DEV/wwn/vpd_unit_serial
	 * value in order to return the NAA id.
	 */
	if (!(dev->se_sub_dev->su_dev_flags & SDF_EMULATED_VPD_UNIT_SERIAL))
		goto check_t10_vend_desc;

	if (off + 20 > cmd->data_length)
		goto check_t10_vend_desc;

	/* CODE SET == Binary */
	buf[off++] = 0x1;

	/* Set ASSOICATION == addressed logical unit: 0)b */
	buf[off] = 0x00;

	/* Identifier/Designator type == NAA identifier */
	buf[off++] = 0x3;
	off++;

	/* Identifier/Designator length */
	buf[off++] = 0x10;

	/*
	 * Start NAA IEEE Registered Extended Identifier/Designator
	 */
	buf[off++] = (0x6 << 4);

	/*
	 * Use OpenFabrics IEEE Company ID: 00 14 05
	 */
	buf[off++] = 0x01;
	buf[off++] = 0x40;
	buf[off] = (0x5 << 4);

	/*
	 * Return ConfigFS Unit Serial Number information for
	 * VENDOR_SPECIFIC_IDENTIFIER and
	 * VENDOR_SPECIFIC_IDENTIFIER_EXTENTION
	 */
	binary = transport_asciihex_to_binaryhex(
				&DEV_T10_WWN(dev)->unit_serial[0]);
	buf[off++] |= (binary & 0xf0) >> 4;
	for (i = 0; i < 24; i += 2) {
		binary_new = transport_asciihex_to_binaryhex(
			&DEV_T10_WWN(dev)->unit_serial[i+2]);
		buf[off] = (binary & 0x0f) << 4;
		buf[off++] |= (binary_new & 0xf0) >> 4;
		binary = binary_new;
	}
	len = 20;
	off = (len + 4);

check_t10_vend_desc:
	/*
	 * T10 Vendor Identifier Page, see spc4r17 section 7.7.3.4
	 */
	id_len = 8; /* For Vendor field */
	prod_len = 4; /* For VPD Header */
	prod_len += 8; /* For Vendor field */
	prod_len += strlen(prod);
	prod_len++; /* For : */

	if (dev->se_sub_dev->su_dev_flags &
			SDF_EMULATED_VPD_UNIT_SERIAL) {
		unit_serial_len =
			strlen(&DEV_T10_WWN(dev)->unit_serial[0]);
		unit_serial_len++; /* For NULL Terminator */

		if ((len + (id_len + 4) +
		    (prod_len + unit_serial_len)) >
				cmd->data_length) {
			len += (prod_len + unit_serial_len);
			goto check_port;
		}
		id_len += sprintf((unsigned char *)&buf[off+12],
				"%s:%s", prod,
				&DEV_T10_WWN(dev)->unit_serial[0]);
	}
	buf[off] = 0x2; /* ASCII */
	buf[off+1] = 0x1; /* T10 Vendor ID */
	buf[off+2] = 0x0;
	memcpy((unsigned char *)&buf[off+4], "LIO-ORG", 8);
	/* Extra Byte for NULL Terminator */
	id_len++;
	/* Identifier Length */
	buf[off+3] = id_len;
	/* Header size for Designation descriptor */
	len += (id_len + 4);
	off += (id_len + 4);
	/*
	 * struct se_port is only set for INQUIRY VPD=1 through $FABRIC_MOD
	 */
check_port:
	port = lun->lun_sep;
	if (port) {
		struct t10_alua_lu_gp *lu_gp;
		u32 padding, scsi_name_len;
		u16 lu_gp_id = 0;
		u16 tg_pt_gp_id = 0;
		u16 tpgt;

		tpg = port->sep_tpg;
		/*
		 * Relative target port identifer, see spc4r17
		 * section 7.7.3.7
		 *
		 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
		 * section 7.5.1 Table 362
		 */
		if (((len + 4) + 8) > cmd->data_length) {
			len += 8;
			goto check_tpgi;
		}
		buf[off] =
			(TPG_TFO(tpg)->get_fabric_proto_ident(tpg) << 4);
		buf[off++] |= 0x1; /* CODE SET == Binary */
		buf[off] = 0x80; /* Set PIV=1 */
		/* Set ASSOICATION == target port: 01b */
		buf[off] |= 0x10;
		/* DESIGNATOR TYPE == Relative target port identifer */
		buf[off++] |= 0x4;
		off++; /* Skip over Reserved */
		buf[off++] = 4; /* DESIGNATOR LENGTH */
		/* Skip over Obsolete field in RTPI payload
		 * in Table 472 */
		off += 2;
		buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
		buf[off++] = (port->sep_rtpi & 0xff);
		len += 8; /* Header size + Designation descriptor */
		/*
		 * Target port group identifier, see spc4r17
		 * section 7.7.3.8
		 *
		 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
		 * section 7.5.1 Table 362
		 */
check_tpgi:
		if (T10_ALUA(dev->se_sub_dev)->alua_type !=
				SPC3_ALUA_EMULATED)
			goto check_scsi_name;

		if (((len + 4) + 8) > cmd->data_length) {
			len += 8;
			goto check_lu_gp;
		}
		tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
		if (!tg_pt_gp_mem)
			goto check_lu_gp;

		spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
		tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
		if (!(tg_pt_gp)) {
			spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
			goto check_lu_gp;
		}
		tg_pt_gp_id = tg_pt_gp->tg_pt_gp_id;
		spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);

		buf[off] =
			(TPG_TFO(tpg)->get_fabric_proto_ident(tpg) << 4);
		buf[off++] |= 0x1; /* CODE SET == Binary */
		buf[off] = 0x80; /* Set PIV=1 */
		/* Set ASSOICATION == target port: 01b */
		buf[off] |= 0x10;
		/* DESIGNATOR TYPE == Target port group identifier */
		buf[off++] |= 0x5;
		off++; /* Skip over Reserved */
		buf[off++] = 4; /* DESIGNATOR LENGTH */
		off += 2; /* Skip over Reserved Field */
		buf[off++] = ((tg_pt_gp_id >> 8) & 0xff);
		buf[off++] = (tg_pt_gp_id & 0xff);
		len += 8; /* Header size + Designation descriptor */
		/*
		 * Logical Unit Group identifier, see spc4r17
		 * section 7.7.3.8
		 */
check_lu_gp:
		if (((len + 4) + 8) > cmd->data_length) {
			len += 8;
			goto check_scsi_name;
		}
		lu_gp_mem = dev->dev_alua_lu_gp_mem;
		if (!(lu_gp_mem))
			goto check_scsi_name;

		spin_lock(&lu_gp_mem->lu_gp_mem_lock);
		lu_gp = lu_gp_mem->lu_gp;
		if (!(lu_gp)) {
			spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
			goto check_scsi_name;
		}
		lu_gp_id = lu_gp->lu_gp_id;
		spin_unlock(&lu_gp_mem->lu_gp_mem_lock);

		buf[off++] |= 0x1; /* CODE SET == Binary */
		/* DESIGNATOR TYPE == Logical Unit Group identifier */
		buf[off++] |= 0x6;
		off++; /* Skip over Reserved */
		buf[off++] = 4; /* DESIGNATOR LENGTH */
		off += 2; /* Skip over Reserved Field */
		buf[off++] = ((lu_gp_id >> 8) & 0xff);
		buf[off++] = (lu_gp_id & 0xff);
		len += 8; /* Header size + Designation descriptor */
		/*
		 * SCSI name string designator, see spc4r17
		 * section 7.7.3.11
		 *
		 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
		 * section 7.5.1 Table 362
		 */
check_scsi_name:
		scsi_name_len = strlen(TPG_TFO(tpg)->tpg_get_wwn(tpg));
		/* UTF-8 ",t,0x<16-bit TPGT>" + NULL Terminator */
		scsi_name_len += 10;
		/* Check for 4-byte padding */
		padding = ((-scsi_name_len) & 3);
		if (padding != 0)
			scsi_name_len += padding;
		/* Header size + Designation descriptor */
		scsi_name_len += 4;

		if (((len + 4) + scsi_name_len) > cmd->data_length) {
			len += scsi_name_len;
			goto set_len;
		}
		buf[off] =
			(TPG_TFO(tpg)->get_fabric_proto_ident(tpg) << 4);
		buf[off++] |= 0x3; /* CODE SET == UTF-8 */
		buf[off] = 0x80; /* Set PIV=1 */
		/* Set ASSOICATION == target port: 01b */
		buf[off] |= 0x10;
		/* DESIGNATOR TYPE == SCSI name string */
		buf[off++] |= 0x8;
		off += 2; /* Skip over Reserved and length */
		/*
		 * SCSI name string identifer containing, $FABRIC_MOD
		 * dependent information.  For LIO-Target and iSCSI
		 * Target Port, this means "<iSCSI name>,t,0x<TPGT> in
		 * UTF-8 encoding.
		 */
		tpgt = TPG_TFO(tpg)->tpg_get_tag(tpg);
		scsi_name_len = sprintf(&buf[off], "%s,t,0x%04x",
					TPG_TFO(tpg)->tpg_get_wwn(tpg), tpgt);
		scsi_name_len += 1 /* Include  NULL terminator */;
		/*
		 * The null-terminated, null-padded (see 4.4.2) SCSI
		 * NAME STRING field contains a UTF-8 format string.
		 * The number of bytes in the SCSI NAME STRING field
		 * (i.e., the value in the DESIGNATOR LENGTH field)
		 * shall be no larger than 256 and shall be a multiple
		 * of four.
		 */
		if (padding)
			scsi_name_len += padding;

		buf[off-1] = scsi_name_len;
		off += scsi_name_len;
		/* Header size + Designation descriptor */
		len += (scsi_name_len + 4);
	}
set_len:
	buf[2] = ((len >> 8) & 0xff);
	buf[3] = (len & 0xff); /* Page Length for VPD 0x83 */
	return 0;
}

/* Extended INQUIRY Data VPD Page */
static int
target_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf)
{
	if (cmd->data_length < 60)
		return 0;

	buf[1] = 0x86;
	buf[2] = 0x3c;
	/* Set HEADSUP, ORDSUP, SIMPSUP */
	buf[5] = 0x07;

	/* If WriteCache emulation is enabled, set V_SUP */
	if (DEV_ATTRIB(SE_DEV(cmd))->emulate_write_cache > 0)
		buf[6] = 0x01;
	return 0;
}

/* Block Limits VPD page */
static int
target_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf)
{
	struct se_device *dev = SE_DEV(cmd);
	int have_tp = 0;

	/*
	 * Following sbc3r22 section 6.5.3 Block Limits VPD page, when
	 * emulate_tpu=1 or emulate_tpws=1 we will be expect a
	 * different page length for Thin Provisioning.
	 */
	if (DEV_ATTRIB(dev)->emulate_tpu || DEV_ATTRIB(dev)->emulate_tpws)
		have_tp = 1;

	if (cmd->data_length < (0x10 + 4)) {
		printk(KERN_INFO "Received data_length: %u"
			" too small for EVPD 0xb0\n",
			cmd->data_length);
		return -1;
	}

	if (have_tp && cmd->data_length < (0x3c + 4)) {
		printk(KERN_INFO "Received data_length: %u"
			" too small for TPE=1 EVPD 0xb0\n",
			cmd->data_length);
		have_tp = 0;
	}

	buf[0] = dev->transport->get_device_type(dev);
	buf[1] = 0xb0;
	buf[3] = have_tp ? 0x3c : 0x10;

	/*
	 * Set OPTIMAL TRANSFER LENGTH GRANULARITY
	 */
	put_unaligned_be16(1, &buf[6]);

	/*
	 * Set MAXIMUM TRANSFER LENGTH
	 */
	put_unaligned_be32(DEV_ATTRIB(dev)->max_sectors, &buf[8]);

	/*
	 * Set OPTIMAL TRANSFER LENGTH
	 */
	put_unaligned_be32(DEV_ATTRIB(dev)->optimal_sectors, &buf[12]);

	/*
	 * Exit now if we don't support TP or the initiator sent a too
	 * short buffer.
	 */
	if (!have_tp || cmd->data_length < (0x3c + 4))
		return 0;

	/*
	 * Set MAXIMUM UNMAP LBA COUNT
	 */
	put_unaligned_be32(DEV_ATTRIB(dev)->max_unmap_lba_count, &buf[20]);

	/*
	 * Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT
	 */
	put_unaligned_be32(DEV_ATTRIB(dev)->max_unmap_block_desc_count,
			   &buf[24]);

	/*
	 * Set OPTIMAL UNMAP GRANULARITY
	 */
	put_unaligned_be32(DEV_ATTRIB(dev)->unmap_granularity, &buf[28]);

	/*
	 * UNMAP GRANULARITY ALIGNMENT
	 */
	put_unaligned_be32(DEV_ATTRIB(dev)->unmap_granularity_alignment,
			   &buf[32]);
	if (DEV_ATTRIB(dev)->unmap_granularity_alignment != 0)
		buf[32] |= 0x80; /* Set the UGAVALID bit */

	return 0;
}

/* Thin Provisioning VPD */
static int
target_emulate_evpd_b2(struct se_cmd *cmd, unsigned char *buf)
{
	struct se_device *dev = SE_DEV(cmd);

	/*
	 * From sbc3r22 section 6.5.4 Thin Provisioning VPD page:
	 *
	 * The PAGE LENGTH field is defined in SPC-4. If the DP bit is set to
	 * zero, then the page length shall be set to 0004h.  If the DP bit
	 * is set to one, then the page length shall be set to the value
	 * defined in table 162.
	 */
	buf[0] = dev->transport->get_device_type(dev);
	buf[1] = 0xb2;

	/*
	 * Set Hardcoded length mentioned above for DP=0
	 */
	put_unaligned_be16(0x0004, &buf[2]);

	/*
	 * The THRESHOLD EXPONENT field indicates the threshold set size in
	 * LBAs as a power of 2 (i.e., the threshold set size is equal to
	 * 2(threshold exponent)).
	 *
	 * Note that this is currently set to 0x00 as mkp says it will be
	 * changing again.  We can enable this once it has settled in T10
	 * and is actually used by Linux/SCSI ML code.
	 */
	buf[4] = 0x00;

	/*
	 * A TPU bit set to one indicates that the device server supports
	 * the UNMAP command (see 5.25). A TPU bit set to zero indicates
	 * that the device server does not support the UNMAP command.
	 */
	if (DEV_ATTRIB(dev)->emulate_tpu != 0)
		buf[5] = 0x80;

	/*
	 * A TPWS bit set to one indicates that the device server supports
	 * the use of the WRITE SAME (16) command (see 5.42) to unmap LBAs.
	 * A TPWS bit set to zero indicates that the device server does not
	 * support the use of the WRITE SAME (16) command to unmap LBAs.
	 */
	if (DEV_ATTRIB(dev)->emulate_tpws != 0)
		buf[5] |= 0x40;

	return 0;
}

static int
target_emulate_inquiry(struct se_cmd *cmd)
{
	struct se_device *dev = SE_DEV(cmd);
	unsigned char *buf = cmd->t_task->t_task_buf;
	unsigned char *cdb = cmd->t_task->t_task_cdb;

	if (!(cdb[1] & 0x1))
		return target_emulate_inquiry_std(cmd);

	/*
	 * Make sure we at least have 4 bytes of INQUIRY response
	 * payload for 0x00 going back for EVPD=1.  Note that 0x80
	 * and 0x83 will check for enough payload data length and
	 * jump to set_len: label when there is not enough inquiry EVPD
	 * payload length left for the next outgoing EVPD metadata
	 */
	if (cmd->data_length < 4) {
		printk(KERN_ERR "SCSI Inquiry payload length: %u"
			" too small for EVPD=1\n", cmd->data_length);
		return -1;
	}
	buf[0] = dev->transport->get_device_type(dev);

	switch (cdb[2]) {
	case 0x00:
		return target_emulate_evpd_00(cmd, buf);
	case 0x80:
		return target_emulate_evpd_80(cmd, buf);
	case 0x83:
		return target_emulate_evpd_83(cmd, buf);
	case 0x86:
		return target_emulate_evpd_86(cmd, buf);
	case 0xb0:
		return target_emulate_evpd_b0(cmd, buf);
	case 0xb2:
		return target_emulate_evpd_b2(cmd, buf);
	default:
		printk(KERN_ERR "Unknown VPD Code: 0x%02x\n", cdb[2]);
		return -1;
	}

	return 0;
}

static int
target_emulate_readcapacity(struct se_cmd *cmd)
{
	struct se_device *dev = SE_DEV(cmd);
	unsigned char *buf = cmd->t_task->t_task_buf;
	u32 blocks = dev->transport->get_blocks(dev);

	buf[0] = (blocks >> 24) & 0xff;
	buf[1] = (blocks >> 16) & 0xff;
	buf[2] = (blocks >> 8) & 0xff;
	buf[3] = blocks & 0xff;
	buf[4] = (DEV_ATTRIB(dev)->block_size >> 24) & 0xff;
	buf[5] = (DEV_ATTRIB(dev)->block_size >> 16) & 0xff;
	buf[6] = (DEV_ATTRIB(dev)->block_size >> 8) & 0xff;
	buf[7] = DEV_ATTRIB(dev)->block_size & 0xff;
	/*
	 * Set max 32-bit blocks to signal SERVICE ACTION READ_CAPACITY_16
	*/
	if (DEV_ATTRIB(dev)->emulate_tpu || DEV_ATTRIB(dev)->emulate_tpws)
		put_unaligned_be32(0xFFFFFFFF, &buf[0]);

	return 0;
}

static int
target_emulate_readcapacity_16(struct se_cmd *cmd)
{
	struct se_device *dev = SE_DEV(cmd);
	unsigned char *buf = cmd->t_task->t_task_buf;
	unsigned long long blocks = dev->transport->get_blocks(dev);

	buf[0] = (blocks >> 56) & 0xff;
	buf[1] = (blocks >> 48) & 0xff;
	buf[2] = (blocks >> 40) & 0xff;
	buf[3] = (blocks >> 32) & 0xff;
	buf[4] = (blocks >> 24) & 0xff;
	buf[5] = (blocks >> 16) & 0xff;
	buf[6] = (blocks >> 8) & 0xff;
	buf[7] = blocks & 0xff;
	buf[8] = (DEV_ATTRIB(dev)->block_size >> 24) & 0xff;
	buf[9] = (DEV_ATTRIB(dev)->block_size >> 16) & 0xff;
	buf[10] = (DEV_ATTRIB(dev)->block_size >> 8) & 0xff;
	buf[11] = DEV_ATTRIB(dev)->block_size & 0xff;
	/*
	 * Set Thin Provisioning Enable bit following sbc3r22 in section
	 * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled.
	 */
	if (DEV_ATTRIB(dev)->emulate_tpu || DEV_ATTRIB(dev)->emulate_tpws)
		buf[14] = 0x80;

	return 0;
}

static int
target_modesense_rwrecovery(unsigned char *p)
{
	p[0] = 0x01;
	p[1] = 0x0a;

	return 12;
}

static int
target_modesense_control(struct se_device *dev, unsigned char *p)
{
	p[0] = 0x0a;
	p[1] = 0x0a;
	p[2] = 2;
	/*
	 * From spc4r17, section 7.4.6 Control mode Page
	 *
	 * Unit Attention interlocks control (UN_INTLCK_CTRL) to code 00b
	 *
	 * 00b: The logical unit shall clear any unit attention condition
	 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
	 * status and shall not establish a unit attention condition when a com-
	 * mand is completed with BUSY, TASK SET FULL, or RESERVATION CONFLICT
	 * status.
	 *
	 * 10b: The logical unit shall not clear any unit attention condition
	 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
	 * status and shall not establish a unit attention condition when
	 * a command is completed with BUSY, TASK SET FULL, or RESERVATION
	 * CONFLICT status.
	 *
	 * 11b a The logical unit shall not clear any unit attention condition
	 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
	 * status and shall establish a unit attention condition for the
	 * initiator port associated with the I_T nexus on which the BUSY,
	 * TASK SET FULL, or RESERVATION CONFLICT status is being returned.
	 * Depending on the status, the additional sense code shall be set to
	 * PREVIOUS BUSY STATUS, PREVIOUS TASK SET FULL STATUS, or PREVIOUS
	 * RESERVATION CONFLICT STATUS. Until it is cleared by a REQUEST SENSE
	 * command, a unit attention condition shall be established only once
	 * for a BUSY, TASK SET FULL, or RESERVATION CONFLICT status regardless
	 * to the number of commands completed with one of those status codes.
	 */
	p[4] = (DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl == 2) ? 0x30 :
	       (DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl == 1) ? 0x20 : 0x00;
	/*
	 * From spc4r17, section 7.4.6 Control mode Page
	 *
	 * Task Aborted Status (TAS) bit set to zero.
	 *
	 * A task aborted status (TAS) bit set to zero specifies that aborted
	 * tasks shall be terminated by the device server without any response
	 * to the application client. A TAS bit set to one specifies that tasks
	 * aborted by the actions of an I_T nexus other than the I_T nexus on
	 * which the command was received shall be completed with TASK ABORTED
	 * status (see SAM-4).
	 */
	p[5] = (DEV_ATTRIB(dev)->emulate_tas) ? 0x40 : 0x00;
	p[8] = 0xff;
	p[9] = 0xff;
	p[11] = 30;

	return 12;
}

static int
target_modesense_caching(struct se_device *dev, unsigned char *p)
{
	p[0] = 0x08;
	p[1] = 0x12;
	if (DEV_ATTRIB(dev)->emulate_write_cache > 0)
		p[2] = 0x04; /* Write Cache Enable */
	p[12] = 0x20; /* Disabled Read Ahead */

	return 20;
}

static void
target_modesense_write_protect(unsigned char *buf, int type)
{
	/*
	 * I believe that the WP bit (bit 7) in the mode header is the same for
	 * all device types..
	 */
	switch (type) {
	case TYPE_DISK:
	case TYPE_TAPE:
	default:
		buf[0] |= 0x80; /* WP bit */
		break;
	}
}

static void
target_modesense_dpofua(unsigned char *buf, int type)
{
	switch (type) {
	case TYPE_DISK:
		buf[0] |= 0x10; /* DPOFUA bit */
		break;
	default:
		break;
	}
}

static int
target_emulate_modesense(struct se_cmd *cmd, int ten)
{
	struct se_device *dev = SE_DEV(cmd);
	char *cdb = cmd->t_task->t_task_cdb;
	unsigned char *rbuf = cmd->t_task->t_task_buf;
	int type = dev->transport->get_device_type(dev);
	int offset = (ten) ? 8 : 4;
	int length = 0;
	unsigned char buf[SE_MODE_PAGE_BUF];

	memset(buf, 0, SE_MODE_PAGE_BUF);

	switch (cdb[2] & 0x3f) {
	case 0x01:
		length = target_modesense_rwrecovery(&buf[offset]);
		break;
	case 0x08:
		length = target_modesense_caching(dev, &buf[offset]);
		break;
	case 0x0a:
		length = target_modesense_control(dev, &buf[offset]);
		break;
	case 0x3f:
		length = target_modesense_rwrecovery(&buf[offset]);
		length += target_modesense_caching(dev, &buf[offset+length]);
		length += target_modesense_control(dev, &buf[offset+length]);
		break;
	default:
		printk(KERN_ERR "Got Unknown Mode Page: 0x%02x\n",
				cdb[2] & 0x3f);
		return PYX_TRANSPORT_UNKNOWN_MODE_PAGE;
	}
	offset += length;

	if (ten) {
		offset -= 2;
		buf[0] = (offset >> 8) & 0xff;
		buf[1] = offset & 0xff;

		if ((SE_LUN(cmd)->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) ||
		    (cmd->se_deve &&
		    (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)))
			target_modesense_write_protect(&buf[3], type);

		if ((DEV_ATTRIB(dev)->emulate_write_cache > 0) &&
		    (DEV_ATTRIB(dev)->emulate_fua_write > 0))
			target_modesense_dpofua(&buf[3], type);

		if ((offset + 2) > cmd->data_length)
			offset = cmd->data_length;

	} else {
		offset -= 1;
		buf[0] = offset & 0xff;

		if ((SE_LUN(cmd)->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) ||
		    (cmd->se_deve &&
		    (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)))
			target_modesense_write_protect(&buf[2], type);

		if ((DEV_ATTRIB(dev)->emulate_write_cache > 0) &&
		    (DEV_ATTRIB(dev)->emulate_fua_write > 0))
			target_modesense_dpofua(&buf[2], type);

		if ((offset + 1) > cmd->data_length)
			offset = cmd->data_length;
	}
	memcpy(rbuf, buf, offset);

	return 0;
}

static int
target_emulate_request_sense(struct se_cmd *cmd)
{
	unsigned char *cdb = cmd->t_task->t_task_cdb;
	unsigned char *buf = cmd->t_task->t_task_buf;
	u8 ua_asc = 0, ua_ascq = 0;

	if (cdb[1] & 0x01) {
		printk(KERN_ERR "REQUEST_SENSE description emulation not"
			" supported\n");
		return PYX_TRANSPORT_INVALID_CDB_FIELD;
	}
	if (!(core_scsi3_ua_clear_for_request_sense(cmd, &ua_asc, &ua_ascq))) {
		/*
		 * CURRENT ERROR, UNIT ATTENTION
		 */
		buf[0] = 0x70;
		buf[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
		/*
		 * Make sure request data length is enough for additional
		 * sense data.
		 */
		if (cmd->data_length <= 18) {
			buf[7] = 0x00;
			return 0;
		}
		/*
		 * The Additional Sense Code (ASC) from the UNIT ATTENTION
		 */
		buf[SPC_ASC_KEY_OFFSET] = ua_asc;
		buf[SPC_ASCQ_KEY_OFFSET] = ua_ascq;
		buf[7] = 0x0A;
	} else {
		/*
		 * CURRENT ERROR, NO SENSE
		 */
		buf[0] = 0x70;
		buf[SPC_SENSE_KEY_OFFSET] = NO_SENSE;
		/*
		 * Make sure request data length is enough for additional
		 * sense data.
		 */
		if (cmd->data_length <= 18) {
			buf[7] = 0x00;
			return 0;
		}
		/*
		 * NO ADDITIONAL SENSE INFORMATION
		 */
		buf[SPC_ASC_KEY_OFFSET] = 0x00;
		buf[7] = 0x0A;
	}

	return 0;
}

/*
 * Used for TCM/IBLOCK and TCM/FILEIO for block/blk-lib.c level discard support.
 * Note this is not used for TCM/pSCSI passthrough
 */
static int
target_emulate_unmap(struct se_task *task)
{
	struct se_cmd *cmd = TASK_CMD(task);
	struct se_device *dev = SE_DEV(cmd);
	unsigned char *buf = cmd->t_task->t_task_buf, *ptr = NULL;
	unsigned char *cdb = &cmd->t_task->t_task_cdb[0];
	sector_t lba;
	unsigned int size = cmd->data_length, range;
	int ret, offset;
	unsigned short dl, bd_dl;

	/* First UNMAP block descriptor starts at 8 byte offset */
	offset = 8;
	size -= 8;
	dl = get_unaligned_be16(&cdb[0]);
	bd_dl = get_unaligned_be16(&cdb[2]);
	ptr = &buf[offset];
	printk(KERN_INFO "UNMAP: Sub: %s Using dl: %hu bd_dl: %hu size: %hu"
		" ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr);

	while (size) {
		lba = get_unaligned_be64(&ptr[0]);
		range = get_unaligned_be32(&ptr[8]);
		printk(KERN_INFO "UNMAP: Using lba: %llu and range: %u\n",
				 (unsigned long long)lba, range);

		ret = dev->transport->do_discard(dev, lba, range);
		if (ret < 0) {
			printk(KERN_ERR "blkdev_issue_discard() failed: %d\n",
					ret);
			return -1;
		}

		ptr += 16;
		size -= 16;
	}

	task->task_scsi_status = GOOD;
	transport_complete_task(task, 1);
	return 0;
}

/*
 * Used for TCM/IBLOCK and TCM/FILEIO for block/blk-lib.c level discard support.
 * Note this is not used for TCM/pSCSI passthrough
 */
static int
target_emulate_write_same(struct se_task *task)
{
	struct se_cmd *cmd = TASK_CMD(task);
	struct se_device *dev = SE_DEV(cmd);
	sector_t lba = cmd->t_task->t_task_lba;
	unsigned int range;
	int ret;

	range = (cmd->data_length / DEV_ATTRIB(dev)->block_size);

	printk(KERN_INFO "WRITE_SAME UNMAP: LBA: %llu Range: %u\n",
			 (unsigned long long)lba, range);

	ret = dev->transport->do_discard(dev, lba, range);
	if (ret < 0) {
		printk(KERN_INFO "blkdev_issue_discard() failed for WRITE_SAME\n");
		return -1;
	}

	task->task_scsi_status = GOOD;
	transport_complete_task(task, 1);
	return 0;
}

int
transport_emulate_control_cdb(struct se_task *task)
{
	struct se_cmd *cmd = TASK_CMD(task);
	struct se_device *dev = SE_DEV(cmd);
	unsigned short service_action;
	int ret = 0;

	switch (cmd->t_task->t_task_cdb[0]) {
	case INQUIRY:
		ret = target_emulate_inquiry(cmd);
		break;
	case READ_CAPACITY:
		ret = target_emulate_readcapacity(cmd);
		break;
	case MODE_SENSE:
		ret = target_emulate_modesense(cmd, 0);
		break;
	case MODE_SENSE_10:
		ret = target_emulate_modesense(cmd, 1);
		break;
	case SERVICE_ACTION_IN:
		switch (cmd->t_task->t_task_cdb[1] & 0x1f) {
		case SAI_READ_CAPACITY_16:
			ret = target_emulate_readcapacity_16(cmd);
			break;
		default:
			printk(KERN_ERR "Unsupported SA: 0x%02x\n",
				cmd->t_task->t_task_cdb[1] & 0x1f);
			return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
		}
		break;
	case REQUEST_SENSE:
		ret = target_emulate_request_sense(cmd);
		break;
	case UNMAP:
		if (!dev->transport->do_discard) {
			printk(KERN_ERR "UNMAP emulation not supported for: %s\n",
					dev->transport->name);
			return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
		}
		ret = target_emulate_unmap(task);
		break;
	case WRITE_SAME_16:
		if (!dev->transport->do_discard) {
			printk(KERN_ERR "WRITE_SAME_16 emulation not supported"
					" for: %s\n", dev->transport->name);
			return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
		}
		ret = target_emulate_write_same(task);
		break;
	case VARIABLE_LENGTH_CMD:
		service_action =
			get_unaligned_be16(&cmd->t_task->t_task_cdb[8]);
		switch (service_action) {
		case WRITE_SAME_32:
			if (!dev->transport->do_discard) {
				printk(KERN_ERR "WRITE_SAME_32 SA emulation not"
					" supported for: %s\n",
					dev->transport->name);
				return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
			}
			ret = target_emulate_write_same(task);
			break;
		default:
			printk(KERN_ERR "Unsupported VARIABLE_LENGTH_CMD SA:"
					" 0x%02x\n", service_action);
			break;
		}
		break;
	case SYNCHRONIZE_CACHE:
	case 0x91: /* SYNCHRONIZE_CACHE_16: */
		if (!dev->transport->do_sync_cache) {
			printk(KERN_ERR
				"SYNCHRONIZE_CACHE emulation not supported"
				" for: %s\n", dev->transport->name);
			return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
		}
		dev->transport->do_sync_cache(task);
		break;
	case ALLOW_MEDIUM_REMOVAL:
	case ERASE:
	case REZERO_UNIT:
	case SEEK_10:
	case SPACE:
	case START_STOP:
	case TEST_UNIT_READY:
	case VERIFY:
	case WRITE_FILEMARKS:
		break;
	default:
		printk(KERN_ERR "Unsupported SCSI Opcode: 0x%02x for %s\n",
			cmd->t_task->t_task_cdb[0], dev->transport->name);
		return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
	}

	if (ret < 0)
		return ret;
	task->task_scsi_status = GOOD;
	transport_complete_task(task, 1);

	return PYX_TRANSPORT_SENT_TO_TRANSPORT;
}