2 * SCSI Primary Commands (SPC) parsing and emulation.
4 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
5 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
6 * Copyright (c) 2007-2010 Rising Tide Systems
7 * Copyright (c) 2008-2010 Linux-iSCSI.org
9 * Nicholas A. Bellinger <nab@kernel.org>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28 #include <asm/unaligned.h>
30 #include <scsi/scsi.h>
31 #include <scsi/scsi_tcq.h>
33 #include <target/target_core_base.h>
34 #include <target/target_core_backend.h>
35 #include <target/target_core_fabric.h>
37 #include "target_core_internal.h"
38 #include "target_core_alua.h"
39 #include "target_core_pr.h"
40 #include "target_core_ua.h"
43 static void spc_fill_alua_data(struct se_port
*port
, unsigned char *buf
)
45 struct t10_alua_tg_pt_gp
*tg_pt_gp
;
46 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
;
49 * Set SCCS for MAINTENANCE_IN + REPORT_TARGET_PORT_GROUPS.
54 * Set TPGS field for explict and/or implict ALUA access type
57 * See spc4r17 section 6.4.2 Table 135
61 tg_pt_gp_mem
= port
->sep_alua_tg_pt_gp_mem
;
65 spin_lock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
66 tg_pt_gp
= tg_pt_gp_mem
->tg_pt_gp
;
68 buf
[5] |= tg_pt_gp
->tg_pt_gp_alua_access_type
;
69 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
72 static int spc_emulate_inquiry_std(struct se_cmd
*cmd
, char *buf
)
74 struct se_lun
*lun
= cmd
->se_lun
;
75 struct se_device
*dev
= cmd
->se_dev
;
77 /* Set RMB (removable media) for tape devices */
78 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
)
81 buf
[2] = 0x05; /* SPC-3 */
84 * NORMACA and HISUP = 0, RESPONSE DATA FORMAT = 2
87 * A RESPONSE DATA FORMAT field set to 2h indicates that the
88 * standard INQUIRY data is in the format defined in this
89 * standard. Response data format values less than 2h are
90 * obsolete. Response data format values greater than 2h are
96 * Enable SCCS and TPGS fields for Emulated ALUA
98 spc_fill_alua_data(lun
->lun_sep
, buf
);
100 buf
[7] = 0x2; /* CmdQue=1 */
102 snprintf(&buf
[8], 8, "LIO-ORG");
103 snprintf(&buf
[16], 16, "%s", dev
->t10_wwn
.model
);
104 snprintf(&buf
[32], 4, "%s", dev
->t10_wwn
.revision
);
105 buf
[4] = 31; /* Set additional length to 31 */
110 /* unit serial number */
111 static int spc_emulate_evpd_80(struct se_cmd
*cmd
, unsigned char *buf
)
113 struct se_device
*dev
= cmd
->se_dev
;
116 if (dev
->dev_flags
& DF_EMULATED_VPD_UNIT_SERIAL
) {
119 unit_serial_len
= strlen(dev
->t10_wwn
.unit_serial
);
120 unit_serial_len
++; /* For NULL Terminator */
122 len
+= sprintf(&buf
[4], "%s", dev
->t10_wwn
.unit_serial
);
123 len
++; /* Extra Byte for NULL Terminator */
129 static void spc_parse_naa_6h_vendor_specific(struct se_device
*dev
,
132 unsigned char *p
= &dev
->t10_wwn
.unit_serial
[0];
137 * Generate up to 36 bits of VENDOR SPECIFIC IDENTIFIER starting on
138 * byte 3 bit 3-0 for NAA IEEE Registered Extended DESIGNATOR field
139 * format, followed by 64 bits of VENDOR SPECIFIC IDENTIFIER EXTENSION
140 * to complete the payload. These are based from VPD=0x80 PRODUCT SERIAL
141 * NUMBER set via vpd_unit_serial in target_core_configfs.c to ensure
142 * per device uniqeness.
144 for (cnt
= 0; *p
&& cnt
< 13; p
++) {
145 int val
= hex_to_bin(*p
);
161 * Device identification VPD, for a complete list of
162 * DESIGNATOR TYPEs see spc4r17 Table 459.
164 static int spc_emulate_evpd_83(struct se_cmd
*cmd
, unsigned char *buf
)
166 struct se_device
*dev
= cmd
->se_dev
;
167 struct se_lun
*lun
= cmd
->se_lun
;
168 struct se_port
*port
= NULL
;
169 struct se_portal_group
*tpg
= NULL
;
170 struct t10_alua_lu_gp_member
*lu_gp_mem
;
171 struct t10_alua_tg_pt_gp
*tg_pt_gp
;
172 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
;
173 unsigned char *prod
= &dev
->t10_wwn
.model
[0];
175 u32 unit_serial_len
, off
= 0;
181 * NAA IEEE Registered Extended Assigned designator format, see
182 * spc4r17 section 7.7.3.6.5
184 * We depend upon a target_core_mod/ConfigFS provided
185 * /sys/kernel/config/target/core/$HBA/$DEV/wwn/vpd_unit_serial
186 * value in order to return the NAA id.
188 if (!(dev
->dev_flags
& DF_EMULATED_VPD_UNIT_SERIAL
))
189 goto check_t10_vend_desc
;
191 /* CODE SET == Binary */
194 /* Set ASSOCIATION == addressed logical unit: 0)b */
197 /* Identifier/Designator type == NAA identifier */
201 /* Identifier/Designator length */
205 * Start NAA IEEE Registered Extended Identifier/Designator
207 buf
[off
++] = (0x6 << 4);
210 * Use OpenFabrics IEEE Company ID: 00 14 05
214 buf
[off
] = (0x5 << 4);
217 * Return ConfigFS Unit Serial Number information for
218 * VENDOR_SPECIFIC_IDENTIFIER and
219 * VENDOR_SPECIFIC_IDENTIFIER_EXTENTION
221 spc_parse_naa_6h_vendor_specific(dev
, &buf
[off
]);
228 * T10 Vendor Identifier Page, see spc4r17 section 7.7.3.4
230 id_len
= 8; /* For Vendor field */
231 prod_len
= 4; /* For VPD Header */
232 prod_len
+= 8; /* For Vendor field */
233 prod_len
+= strlen(prod
);
234 prod_len
++; /* For : */
236 if (dev
->dev_flags
& DF_EMULATED_VPD_UNIT_SERIAL
) {
237 unit_serial_len
= strlen(&dev
->t10_wwn
.unit_serial
[0]);
238 unit_serial_len
++; /* For NULL Terminator */
240 id_len
+= sprintf(&buf
[off
+12], "%s:%s", prod
,
241 &dev
->t10_wwn
.unit_serial
[0]);
243 buf
[off
] = 0x2; /* ASCII */
244 buf
[off
+1] = 0x1; /* T10 Vendor ID */
246 memcpy(&buf
[off
+4], "LIO-ORG", 8);
247 /* Extra Byte for NULL Terminator */
249 /* Identifier Length */
251 /* Header size for Designation descriptor */
255 * struct se_port is only set for INQUIRY VPD=1 through $FABRIC_MOD
259 struct t10_alua_lu_gp
*lu_gp
;
260 u32 padding
, scsi_name_len
;
267 * Relative target port identifer, see spc4r17
270 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
271 * section 7.5.1 Table 362
274 (tpg
->se_tpg_tfo
->get_fabric_proto_ident(tpg
) << 4);
275 buf
[off
++] |= 0x1; /* CODE SET == Binary */
276 buf
[off
] = 0x80; /* Set PIV=1 */
277 /* Set ASSOCIATION == target port: 01b */
279 /* DESIGNATOR TYPE == Relative target port identifer */
281 off
++; /* Skip over Reserved */
282 buf
[off
++] = 4; /* DESIGNATOR LENGTH */
283 /* Skip over Obsolete field in RTPI payload
286 buf
[off
++] = ((port
->sep_rtpi
>> 8) & 0xff);
287 buf
[off
++] = (port
->sep_rtpi
& 0xff);
288 len
+= 8; /* Header size + Designation descriptor */
290 * Target port group identifier, see spc4r17
293 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
294 * section 7.5.1 Table 362
296 tg_pt_gp_mem
= port
->sep_alua_tg_pt_gp_mem
;
300 spin_lock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
301 tg_pt_gp
= tg_pt_gp_mem
->tg_pt_gp
;
303 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
306 tg_pt_gp_id
= tg_pt_gp
->tg_pt_gp_id
;
307 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
310 (tpg
->se_tpg_tfo
->get_fabric_proto_ident(tpg
) << 4);
311 buf
[off
++] |= 0x1; /* CODE SET == Binary */
312 buf
[off
] = 0x80; /* Set PIV=1 */
313 /* Set ASSOCIATION == target port: 01b */
315 /* DESIGNATOR TYPE == Target port group identifier */
317 off
++; /* Skip over Reserved */
318 buf
[off
++] = 4; /* DESIGNATOR LENGTH */
319 off
+= 2; /* Skip over Reserved Field */
320 buf
[off
++] = ((tg_pt_gp_id
>> 8) & 0xff);
321 buf
[off
++] = (tg_pt_gp_id
& 0xff);
322 len
+= 8; /* Header size + Designation descriptor */
324 * Logical Unit Group identifier, see spc4r17
328 lu_gp_mem
= dev
->dev_alua_lu_gp_mem
;
330 goto check_scsi_name
;
332 spin_lock(&lu_gp_mem
->lu_gp_mem_lock
);
333 lu_gp
= lu_gp_mem
->lu_gp
;
335 spin_unlock(&lu_gp_mem
->lu_gp_mem_lock
);
336 goto check_scsi_name
;
338 lu_gp_id
= lu_gp
->lu_gp_id
;
339 spin_unlock(&lu_gp_mem
->lu_gp_mem_lock
);
341 buf
[off
++] |= 0x1; /* CODE SET == Binary */
342 /* DESIGNATOR TYPE == Logical Unit Group identifier */
344 off
++; /* Skip over Reserved */
345 buf
[off
++] = 4; /* DESIGNATOR LENGTH */
346 off
+= 2; /* Skip over Reserved Field */
347 buf
[off
++] = ((lu_gp_id
>> 8) & 0xff);
348 buf
[off
++] = (lu_gp_id
& 0xff);
349 len
+= 8; /* Header size + Designation descriptor */
351 * SCSI name string designator, see spc4r17
354 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
355 * section 7.5.1 Table 362
358 scsi_name_len
= strlen(tpg
->se_tpg_tfo
->tpg_get_wwn(tpg
));
359 /* UTF-8 ",t,0x<16-bit TPGT>" + NULL Terminator */
361 /* Check for 4-byte padding */
362 padding
= ((-scsi_name_len
) & 3);
364 scsi_name_len
+= padding
;
365 /* Header size + Designation descriptor */
369 (tpg
->se_tpg_tfo
->get_fabric_proto_ident(tpg
) << 4);
370 buf
[off
++] |= 0x3; /* CODE SET == UTF-8 */
371 buf
[off
] = 0x80; /* Set PIV=1 */
372 /* Set ASSOCIATION == target port: 01b */
374 /* DESIGNATOR TYPE == SCSI name string */
376 off
+= 2; /* Skip over Reserved and length */
378 * SCSI name string identifer containing, $FABRIC_MOD
379 * dependent information. For LIO-Target and iSCSI
380 * Target Port, this means "<iSCSI name>,t,0x<TPGT> in
383 tpgt
= tpg
->se_tpg_tfo
->tpg_get_tag(tpg
);
384 scsi_name_len
= sprintf(&buf
[off
], "%s,t,0x%04x",
385 tpg
->se_tpg_tfo
->tpg_get_wwn(tpg
), tpgt
);
386 scsi_name_len
+= 1 /* Include NULL terminator */;
388 * The null-terminated, null-padded (see 4.4.2) SCSI
389 * NAME STRING field contains a UTF-8 format string.
390 * The number of bytes in the SCSI NAME STRING field
391 * (i.e., the value in the DESIGNATOR LENGTH field)
392 * shall be no larger than 256 and shall be a multiple
396 scsi_name_len
+= padding
;
398 buf
[off
-1] = scsi_name_len
;
399 off
+= scsi_name_len
;
400 /* Header size + Designation descriptor */
401 len
+= (scsi_name_len
+ 4);
403 buf
[2] = ((len
>> 8) & 0xff);
404 buf
[3] = (len
& 0xff); /* Page Length for VPD 0x83 */
408 /* Extended INQUIRY Data VPD Page */
409 static int spc_emulate_evpd_86(struct se_cmd
*cmd
, unsigned char *buf
)
412 /* Set HEADSUP, ORDSUP, SIMPSUP */
415 /* If WriteCache emulation is enabled, set V_SUP */
416 if (cmd
->se_dev
->dev_attrib
.emulate_write_cache
> 0)
421 /* Block Limits VPD page */
422 static int spc_emulate_evpd_b0(struct se_cmd
*cmd
, unsigned char *buf
)
424 struct se_device
*dev
= cmd
->se_dev
;
429 * Following spc3r22 section 6.5.3 Block Limits VPD page, when
430 * emulate_tpu=1 or emulate_tpws=1 we will be expect a
431 * different page length for Thin Provisioning.
433 if (dev
->dev_attrib
.emulate_tpu
|| dev
->dev_attrib
.emulate_tpws
)
436 buf
[0] = dev
->transport
->get_device_type(dev
);
437 buf
[3] = have_tp
? 0x3c : 0x10;
443 * Set OPTIMAL TRANSFER LENGTH GRANULARITY
445 put_unaligned_be16(1, &buf
[6]);
448 * Set MAXIMUM TRANSFER LENGTH
450 max_sectors
= min(dev
->dev_attrib
.fabric_max_sectors
,
451 dev
->dev_attrib
.hw_max_sectors
);
452 put_unaligned_be32(max_sectors
, &buf
[8]);
455 * Set OPTIMAL TRANSFER LENGTH
457 put_unaligned_be32(dev
->dev_attrib
.optimal_sectors
, &buf
[12]);
460 * Exit now if we don't support TP.
466 * Set MAXIMUM UNMAP LBA COUNT
468 put_unaligned_be32(dev
->dev_attrib
.max_unmap_lba_count
, &buf
[20]);
471 * Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT
473 put_unaligned_be32(dev
->dev_attrib
.max_unmap_block_desc_count
,
477 * Set OPTIMAL UNMAP GRANULARITY
479 put_unaligned_be32(dev
->dev_attrib
.unmap_granularity
, &buf
[28]);
482 * UNMAP GRANULARITY ALIGNMENT
484 put_unaligned_be32(dev
->dev_attrib
.unmap_granularity_alignment
,
486 if (dev
->dev_attrib
.unmap_granularity_alignment
!= 0)
487 buf
[32] |= 0x80; /* Set the UGAVALID bit */
492 /* Block Device Characteristics VPD page */
493 static int spc_emulate_evpd_b1(struct se_cmd
*cmd
, unsigned char *buf
)
495 struct se_device
*dev
= cmd
->se_dev
;
497 buf
[0] = dev
->transport
->get_device_type(dev
);
499 buf
[5] = dev
->dev_attrib
.is_nonrot
? 1 : 0;
504 /* Thin Provisioning VPD */
505 static int spc_emulate_evpd_b2(struct se_cmd
*cmd
, unsigned char *buf
)
507 struct se_device
*dev
= cmd
->se_dev
;
510 * From spc3r22 section 6.5.4 Thin Provisioning VPD page:
512 * The PAGE LENGTH field is defined in SPC-4. If the DP bit is set to
513 * zero, then the page length shall be set to 0004h. If the DP bit
514 * is set to one, then the page length shall be set to the value
515 * defined in table 162.
517 buf
[0] = dev
->transport
->get_device_type(dev
);
520 * Set Hardcoded length mentioned above for DP=0
522 put_unaligned_be16(0x0004, &buf
[2]);
525 * The THRESHOLD EXPONENT field indicates the threshold set size in
526 * LBAs as a power of 2 (i.e., the threshold set size is equal to
527 * 2(threshold exponent)).
529 * Note that this is currently set to 0x00 as mkp says it will be
530 * changing again. We can enable this once it has settled in T10
531 * and is actually used by Linux/SCSI ML code.
536 * A TPU bit set to one indicates that the device server supports
537 * the UNMAP command (see 5.25). A TPU bit set to zero indicates
538 * that the device server does not support the UNMAP command.
540 if (dev
->dev_attrib
.emulate_tpu
!= 0)
544 * A TPWS bit set to one indicates that the device server supports
545 * the use of the WRITE SAME (16) command (see 5.42) to unmap LBAs.
546 * A TPWS bit set to zero indicates that the device server does not
547 * support the use of the WRITE SAME (16) command to unmap LBAs.
549 if (dev
->dev_attrib
.emulate_tpws
!= 0)
555 static int spc_emulate_evpd_00(struct se_cmd
*cmd
, unsigned char *buf
);
559 int (*emulate
)(struct se_cmd
*, unsigned char *);
560 } evpd_handlers
[] = {
561 { .page
= 0x00, .emulate
= spc_emulate_evpd_00
},
562 { .page
= 0x80, .emulate
= spc_emulate_evpd_80
},
563 { .page
= 0x83, .emulate
= spc_emulate_evpd_83
},
564 { .page
= 0x86, .emulate
= spc_emulate_evpd_86
},
565 { .page
= 0xb0, .emulate
= spc_emulate_evpd_b0
},
566 { .page
= 0xb1, .emulate
= spc_emulate_evpd_b1
},
567 { .page
= 0xb2, .emulate
= spc_emulate_evpd_b2
},
570 /* supported vital product data pages */
571 static int spc_emulate_evpd_00(struct se_cmd
*cmd
, unsigned char *buf
)
576 * Only report the INQUIRY EVPD=1 pages after a valid NAA
577 * Registered Extended LUN WWN has been set via ConfigFS
578 * during device creation/restart.
580 if (cmd
->se_dev
->dev_flags
& DF_EMULATED_VPD_UNIT_SERIAL
) {
581 buf
[3] = ARRAY_SIZE(evpd_handlers
);
582 for (p
= 0; p
< ARRAY_SIZE(evpd_handlers
); ++p
)
583 buf
[p
+ 4] = evpd_handlers
[p
].page
;
589 static int spc_emulate_inquiry(struct se_cmd
*cmd
)
591 struct se_device
*dev
= cmd
->se_dev
;
592 struct se_portal_group
*tpg
= cmd
->se_lun
->lun_sep
->sep_tpg
;
594 unsigned char *cdb
= cmd
->t_task_cdb
;
595 unsigned char buf
[SE_INQUIRY_BUF
];
598 memset(buf
, 0, SE_INQUIRY_BUF
);
600 if (dev
== tpg
->tpg_virt_lun0
.lun_se_dev
)
601 buf
[0] = 0x3f; /* Not connected */
603 buf
[0] = dev
->transport
->get_device_type(dev
);
605 if (!(cdb
[1] & 0x1)) {
607 pr_err("INQUIRY with EVPD==0 but PAGE CODE=%02x\n",
609 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
614 ret
= spc_emulate_inquiry_std(cmd
, buf
);
618 for (p
= 0; p
< ARRAY_SIZE(evpd_handlers
); ++p
) {
619 if (cdb
[2] == evpd_handlers
[p
].page
) {
621 ret
= evpd_handlers
[p
].emulate(cmd
, buf
);
626 pr_err("Unknown VPD Code: 0x%02x\n", cdb
[2]);
627 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
631 rbuf
= transport_kmap_data_sg(cmd
);
633 memcpy(rbuf
, buf
, min_t(u32
, sizeof(buf
), cmd
->data_length
));
634 transport_kunmap_data_sg(cmd
);
638 target_complete_cmd(cmd
, GOOD
);
642 static int spc_modesense_rwrecovery(unsigned char *p
)
650 static int spc_modesense_control(struct se_device
*dev
, unsigned char *p
)
656 * From spc4r23, 7.4.7 Control mode page
658 * The QUEUE ALGORITHM MODIFIER field (see table 368) specifies
659 * restrictions on the algorithm used for reordering commands
660 * having the SIMPLE task attribute (see SAM-4).
662 * Table 368 -- QUEUE ALGORITHM MODIFIER field
664 * 0h Restricted reordering
665 * 1h Unrestricted reordering allowed
667 * 8h to Fh Vendor specific
669 * A value of zero in the QUEUE ALGORITHM MODIFIER field specifies that
670 * the device server shall order the processing sequence of commands
671 * having the SIMPLE task attribute such that data integrity is maintained
672 * for that I_T nexus (i.e., if the transmission of new SCSI transport protocol
673 * requests is halted at any time, the final value of all data observable
674 * on the medium shall be the same as if all the commands had been processed
675 * with the ORDERED task attribute).
677 * A value of one in the QUEUE ALGORITHM MODIFIER field specifies that the
678 * device server may reorder the processing sequence of commands having the
679 * SIMPLE task attribute in any manner. Any data integrity exposures related to
680 * command sequence order shall be explicitly handled by the application client
681 * through the selection of appropriate ommands and task attributes.
683 p
[3] = (dev
->dev_attrib
.emulate_rest_reord
== 1) ? 0x00 : 0x10;
685 * From spc4r17, section 7.4.6 Control mode Page
687 * Unit Attention interlocks control (UN_INTLCK_CTRL) to code 00b
689 * 00b: The logical unit shall clear any unit attention condition
690 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
691 * status and shall not establish a unit attention condition when a com-
692 * mand is completed with BUSY, TASK SET FULL, or RESERVATION CONFLICT
695 * 10b: The logical unit shall not clear any unit attention condition
696 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
697 * status and shall not establish a unit attention condition when
698 * a command is completed with BUSY, TASK SET FULL, or RESERVATION
701 * 11b a The logical unit shall not clear any unit attention condition
702 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
703 * status and shall establish a unit attention condition for the
704 * initiator port associated with the I_T nexus on which the BUSY,
705 * TASK SET FULL, or RESERVATION CONFLICT status is being returned.
706 * Depending on the status, the additional sense code shall be set to
707 * PREVIOUS BUSY STATUS, PREVIOUS TASK SET FULL STATUS, or PREVIOUS
708 * RESERVATION CONFLICT STATUS. Until it is cleared by a REQUEST SENSE
709 * command, a unit attention condition shall be established only once
710 * for a BUSY, TASK SET FULL, or RESERVATION CONFLICT status regardless
711 * to the number of commands completed with one of those status codes.
713 p
[4] = (dev
->dev_attrib
.emulate_ua_intlck_ctrl
== 2) ? 0x30 :
714 (dev
->dev_attrib
.emulate_ua_intlck_ctrl
== 1) ? 0x20 : 0x00;
716 * From spc4r17, section 7.4.6 Control mode Page
718 * Task Aborted Status (TAS) bit set to zero.
720 * A task aborted status (TAS) bit set to zero specifies that aborted
721 * tasks shall be terminated by the device server without any response
722 * to the application client. A TAS bit set to one specifies that tasks
723 * aborted by the actions of an I_T nexus other than the I_T nexus on
724 * which the command was received shall be completed with TASK ABORTED
725 * status (see SAM-4).
727 p
[5] = (dev
->dev_attrib
.emulate_tas
) ? 0x40 : 0x00;
735 static int spc_modesense_caching(struct se_device
*dev
, unsigned char *p
)
739 if (dev
->dev_attrib
.emulate_write_cache
> 0)
740 p
[2] = 0x04; /* Write Cache Enable */
741 p
[12] = 0x20; /* Disabled Read Ahead */
746 static void spc_modesense_write_protect(unsigned char *buf
, int type
)
749 * I believe that the WP bit (bit 7) in the mode header is the same for
756 buf
[0] |= 0x80; /* WP bit */
761 static void spc_modesense_dpofua(unsigned char *buf
, int type
)
765 buf
[0] |= 0x10; /* DPOFUA bit */
772 static int spc_emulate_modesense(struct se_cmd
*cmd
)
774 struct se_device
*dev
= cmd
->se_dev
;
775 char *cdb
= cmd
->t_task_cdb
;
777 int type
= dev
->transport
->get_device_type(dev
);
778 int ten
= (cmd
->t_task_cdb
[0] == MODE_SENSE_10
);
779 u32 offset
= ten
? 8 : 4;
781 unsigned char buf
[SE_MODE_PAGE_BUF
];
783 memset(buf
, 0, SE_MODE_PAGE_BUF
);
785 switch (cdb
[2] & 0x3f) {
787 length
= spc_modesense_rwrecovery(&buf
[offset
]);
790 length
= spc_modesense_caching(dev
, &buf
[offset
]);
793 length
= spc_modesense_control(dev
, &buf
[offset
]);
796 length
= spc_modesense_rwrecovery(&buf
[offset
]);
797 length
+= spc_modesense_caching(dev
, &buf
[offset
+length
]);
798 length
+= spc_modesense_control(dev
, &buf
[offset
+length
]);
801 pr_err("MODE SENSE: unimplemented page/subpage: 0x%02x/0x%02x\n",
802 cdb
[2] & 0x3f, cdb
[3]);
803 cmd
->scsi_sense_reason
= TCM_UNKNOWN_MODE_PAGE
;
810 buf
[0] = (offset
>> 8) & 0xff;
811 buf
[1] = offset
& 0xff;
814 if ((cmd
->se_lun
->lun_access
& TRANSPORT_LUNFLAGS_READ_ONLY
) ||
816 (cmd
->se_deve
->lun_flags
& TRANSPORT_LUNFLAGS_READ_ONLY
)))
817 spc_modesense_write_protect(&buf
[3], type
);
819 if ((dev
->dev_attrib
.emulate_write_cache
> 0) &&
820 (dev
->dev_attrib
.emulate_fua_write
> 0))
821 spc_modesense_dpofua(&buf
[3], type
);
824 buf
[0] = offset
& 0xff;
827 if ((cmd
->se_lun
->lun_access
& TRANSPORT_LUNFLAGS_READ_ONLY
) ||
829 (cmd
->se_deve
->lun_flags
& TRANSPORT_LUNFLAGS_READ_ONLY
)))
830 spc_modesense_write_protect(&buf
[2], type
);
832 if ((dev
->dev_attrib
.emulate_write_cache
> 0) &&
833 (dev
->dev_attrib
.emulate_fua_write
> 0))
834 spc_modesense_dpofua(&buf
[2], type
);
837 rbuf
= transport_kmap_data_sg(cmd
);
839 memcpy(rbuf
, buf
, min(offset
, cmd
->data_length
));
840 transport_kunmap_data_sg(cmd
);
843 target_complete_cmd(cmd
, GOOD
);
847 static int spc_emulate_request_sense(struct se_cmd
*cmd
)
849 unsigned char *cdb
= cmd
->t_task_cdb
;
851 u8 ua_asc
= 0, ua_ascq
= 0;
852 unsigned char buf
[SE_SENSE_BUF
];
854 memset(buf
, 0, SE_SENSE_BUF
);
857 pr_err("REQUEST_SENSE description emulation not"
859 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
863 rbuf
= transport_kmap_data_sg(cmd
);
864 if (cmd
->scsi_sense_reason
!= 0) {
866 * Out of memory. We will fail with CHECK CONDITION, so
867 * we must not clear the unit attention condition.
869 target_complete_cmd(cmd
, CHECK_CONDITION
);
871 } else if (!core_scsi3_ua_clear_for_request_sense(cmd
, &ua_asc
, &ua_ascq
)) {
873 * CURRENT ERROR, UNIT ATTENTION
876 buf
[SPC_SENSE_KEY_OFFSET
] = UNIT_ATTENTION
;
879 * The Additional Sense Code (ASC) from the UNIT ATTENTION
881 buf
[SPC_ASC_KEY_OFFSET
] = ua_asc
;
882 buf
[SPC_ASCQ_KEY_OFFSET
] = ua_ascq
;
886 * CURRENT ERROR, NO SENSE
889 buf
[SPC_SENSE_KEY_OFFSET
] = NO_SENSE
;
892 * NO ADDITIONAL SENSE INFORMATION
894 buf
[SPC_ASC_KEY_OFFSET
] = 0x00;
899 memcpy(rbuf
, buf
, min_t(u32
, sizeof(buf
), cmd
->data_length
));
900 transport_kunmap_data_sg(cmd
);
903 target_complete_cmd(cmd
, GOOD
);
907 int spc_emulate_report_luns(struct se_cmd
*cmd
)
909 struct se_dev_entry
*deve
;
910 struct se_session
*sess
= cmd
->se_sess
;
912 u32 lun_count
= 0, offset
= 8, i
;
914 if (cmd
->data_length
< 16) {
915 pr_warn("REPORT LUNS allocation length %u too small\n",
917 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
921 buf
= transport_kmap_data_sg(cmd
);
926 * If no struct se_session pointer is present, this struct se_cmd is
927 * coming via a target_core_mod PASSTHROUGH op, and not through
928 * a $FABRIC_MOD. In that case, report LUN=0 only.
931 int_to_scsilun(0, (struct scsi_lun
*)&buf
[offset
]);
936 spin_lock_irq(&sess
->se_node_acl
->device_list_lock
);
937 for (i
= 0; i
< TRANSPORT_MAX_LUNS_PER_TPG
; i
++) {
938 deve
= sess
->se_node_acl
->device_list
[i
];
939 if (!(deve
->lun_flags
& TRANSPORT_LUNFLAGS_INITIATOR_ACCESS
))
942 * We determine the correct LUN LIST LENGTH even once we
943 * have reached the initial allocation length.
947 if ((offset
+ 8) > cmd
->data_length
)
950 int_to_scsilun(deve
->mapped_lun
, (struct scsi_lun
*)&buf
[offset
]);
953 spin_unlock_irq(&sess
->se_node_acl
->device_list_lock
);
956 * See SPC3 r07, page 159.
960 buf
[0] = ((lun_count
>> 24) & 0xff);
961 buf
[1] = ((lun_count
>> 16) & 0xff);
962 buf
[2] = ((lun_count
>> 8) & 0xff);
963 buf
[3] = (lun_count
& 0xff);
964 transport_kunmap_data_sg(cmd
);
966 target_complete_cmd(cmd
, GOOD
);
969 EXPORT_SYMBOL(spc_emulate_report_luns
);
971 static int spc_emulate_testunitready(struct se_cmd
*cmd
)
973 target_complete_cmd(cmd
, GOOD
);
977 int spc_parse_cdb(struct se_cmd
*cmd
, unsigned int *size
)
979 struct se_device
*dev
= cmd
->se_dev
;
980 unsigned char *cdb
= cmd
->t_task_cdb
;
987 *size
= (cdb
[7] << 8) + cdb
[8];
991 cmd
->execute_cmd
= spc_emulate_modesense
;
994 *size
= (cdb
[7] << 8) + cdb
[8];
995 cmd
->execute_cmd
= spc_emulate_modesense
;
999 *size
= (cdb
[7] << 8) + cdb
[8];
1001 case PERSISTENT_RESERVE_IN
:
1002 *size
= (cdb
[7] << 8) + cdb
[8];
1003 cmd
->execute_cmd
= target_scsi3_emulate_pr_in
;
1005 case PERSISTENT_RESERVE_OUT
:
1006 *size
= (cdb
[7] << 8) + cdb
[8];
1007 cmd
->execute_cmd
= target_scsi3_emulate_pr_out
;
1011 if (cdb
[0] == RELEASE_10
)
1012 *size
= (cdb
[7] << 8) | cdb
[8];
1014 *size
= cmd
->data_length
;
1016 cmd
->execute_cmd
= target_scsi2_reservation_release
;
1021 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
1022 * Assume the passthrough or $FABRIC_MOD will tell us about it.
1024 if (cdb
[0] == RESERVE_10
)
1025 *size
= (cdb
[7] << 8) | cdb
[8];
1027 *size
= cmd
->data_length
;
1029 cmd
->execute_cmd
= target_scsi2_reservation_reserve
;
1033 cmd
->execute_cmd
= spc_emulate_request_sense
;
1036 *size
= (cdb
[3] << 8) + cdb
[4];
1039 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
1040 * See spc4r17 section 5.3
1042 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
1043 cmd
->execute_cmd
= spc_emulate_inquiry
;
1045 case SECURITY_PROTOCOL_IN
:
1046 case SECURITY_PROTOCOL_OUT
:
1047 *size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
1050 case READ_ATTRIBUTE
:
1051 case RECEIVE_COPY_RESULTS
:
1052 case WRITE_ATTRIBUTE
:
1053 *size
= (cdb
[10] << 24) | (cdb
[11] << 16) |
1054 (cdb
[12] << 8) | cdb
[13];
1056 case RECEIVE_DIAGNOSTIC
:
1057 case SEND_DIAGNOSTIC
:
1058 *size
= (cdb
[3] << 8) | cdb
[4];
1061 *size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
1064 cmd
->execute_cmd
= spc_emulate_report_luns
;
1065 *size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
1067 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
1068 * See spc4r17 section 5.3
1070 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
1072 case TEST_UNIT_READY
:
1073 cmd
->execute_cmd
= spc_emulate_testunitready
;
1076 case MAINTENANCE_IN
:
1077 if (dev
->transport
->get_device_type(dev
) != TYPE_ROM
) {
1079 * MAINTENANCE_IN from SCC-2
1080 * Check for emulated MI_REPORT_TARGET_PGS
1082 if ((cdb
[1] & 0x1f) == MI_REPORT_TARGET_PGS
) {
1084 target_emulate_report_target_port_groups
;
1086 *size
= get_unaligned_be32(&cdb
[6]);
1089 * GPCMD_SEND_KEY from multi media commands
1091 *size
= get_unaligned_be16(&cdb
[8]);
1094 case MAINTENANCE_OUT
:
1095 if (dev
->transport
->get_device_type(dev
) != TYPE_ROM
) {
1097 * MAINTENANCE_OUT from SCC-2
1098 * Check for emulated MO_SET_TARGET_PGS.
1100 if (cdb
[1] == MO_SET_TARGET_PGS
) {
1102 target_emulate_set_target_port_groups
;
1104 *size
= get_unaligned_be32(&cdb
[6]);
1107 * GPCMD_SEND_KEY from multi media commands
1109 *size
= get_unaligned_be16(&cdb
[8]);
1113 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
1114 " 0x%02x, sending CHECK_CONDITION.\n",
1115 cmd
->se_tfo
->get_fabric_name(), cdb
[0]);
1116 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1117 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
1123 EXPORT_SYMBOL(spc_parse_cdb
);