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] = dev
->transport
->get_device_rev(dev
);
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 if (dev
->t10_alua
.alua_type
== SPC3_ALUA_EMULATED
)
99 spc_fill_alua_data(lun
->lun_sep
, buf
);
101 buf
[7] = 0x2; /* CmdQue=1 */
103 snprintf(&buf
[8], 8, "LIO-ORG");
104 snprintf(&buf
[16], 16, "%s", dev
->t10_wwn
.model
);
105 snprintf(&buf
[32], 4, "%s", dev
->t10_wwn
.revision
);
106 buf
[4] = 31; /* Set additional length to 31 */
111 /* unit serial number */
112 static int spc_emulate_evpd_80(struct se_cmd
*cmd
, unsigned char *buf
)
114 struct se_device
*dev
= cmd
->se_dev
;
117 if (dev
->dev_flags
& DF_EMULATED_VPD_UNIT_SERIAL
) {
120 unit_serial_len
= strlen(dev
->t10_wwn
.unit_serial
);
121 unit_serial_len
++; /* For NULL Terminator */
123 len
+= sprintf(&buf
[4], "%s", dev
->t10_wwn
.unit_serial
);
124 len
++; /* Extra Byte for NULL Terminator */
130 static void spc_parse_naa_6h_vendor_specific(struct se_device
*dev
,
133 unsigned char *p
= &dev
->t10_wwn
.unit_serial
[0];
138 * Generate up to 36 bits of VENDOR SPECIFIC IDENTIFIER starting on
139 * byte 3 bit 3-0 for NAA IEEE Registered Extended DESIGNATOR field
140 * format, followed by 64 bits of VENDOR SPECIFIC IDENTIFIER EXTENSION
141 * to complete the payload. These are based from VPD=0x80 PRODUCT SERIAL
142 * NUMBER set via vpd_unit_serial in target_core_configfs.c to ensure
143 * per device uniqeness.
145 for (cnt
= 0; *p
&& cnt
< 13; p
++) {
146 int val
= hex_to_bin(*p
);
162 * Device identification VPD, for a complete list of
163 * DESIGNATOR TYPEs see spc4r17 Table 459.
165 static int spc_emulate_evpd_83(struct se_cmd
*cmd
, unsigned char *buf
)
167 struct se_device
*dev
= cmd
->se_dev
;
168 struct se_lun
*lun
= cmd
->se_lun
;
169 struct se_port
*port
= NULL
;
170 struct se_portal_group
*tpg
= NULL
;
171 struct t10_alua_lu_gp_member
*lu_gp_mem
;
172 struct t10_alua_tg_pt_gp
*tg_pt_gp
;
173 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
;
174 unsigned char *prod
= &dev
->t10_wwn
.model
[0];
176 u32 unit_serial_len
, off
= 0;
182 * NAA IEEE Registered Extended Assigned designator format, see
183 * spc4r17 section 7.7.3.6.5
185 * We depend upon a target_core_mod/ConfigFS provided
186 * /sys/kernel/config/target/core/$HBA/$DEV/wwn/vpd_unit_serial
187 * value in order to return the NAA id.
189 if (!(dev
->dev_flags
& DF_EMULATED_VPD_UNIT_SERIAL
))
190 goto check_t10_vend_desc
;
192 /* CODE SET == Binary */
195 /* Set ASSOCIATION == addressed logical unit: 0)b */
198 /* Identifier/Designator type == NAA identifier */
202 /* Identifier/Designator length */
206 * Start NAA IEEE Registered Extended Identifier/Designator
208 buf
[off
++] = (0x6 << 4);
211 * Use OpenFabrics IEEE Company ID: 00 14 05
215 buf
[off
] = (0x5 << 4);
218 * Return ConfigFS Unit Serial Number information for
219 * VENDOR_SPECIFIC_IDENTIFIER and
220 * VENDOR_SPECIFIC_IDENTIFIER_EXTENTION
222 spc_parse_naa_6h_vendor_specific(dev
, &buf
[off
]);
229 * T10 Vendor Identifier Page, see spc4r17 section 7.7.3.4
231 id_len
= 8; /* For Vendor field */
232 prod_len
= 4; /* For VPD Header */
233 prod_len
+= 8; /* For Vendor field */
234 prod_len
+= strlen(prod
);
235 prod_len
++; /* For : */
237 if (dev
->dev_flags
& DF_EMULATED_VPD_UNIT_SERIAL
) {
238 unit_serial_len
= strlen(&dev
->t10_wwn
.unit_serial
[0]);
239 unit_serial_len
++; /* For NULL Terminator */
241 id_len
+= sprintf(&buf
[off
+12], "%s:%s", prod
,
242 &dev
->t10_wwn
.unit_serial
[0]);
244 buf
[off
] = 0x2; /* ASCII */
245 buf
[off
+1] = 0x1; /* T10 Vendor ID */
247 memcpy(&buf
[off
+4], "LIO-ORG", 8);
248 /* Extra Byte for NULL Terminator */
250 /* Identifier Length */
252 /* Header size for Designation descriptor */
256 * struct se_port is only set for INQUIRY VPD=1 through $FABRIC_MOD
260 struct t10_alua_lu_gp
*lu_gp
;
261 u32 padding
, scsi_name_len
;
268 * Relative target port identifer, see spc4r17
271 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
272 * section 7.5.1 Table 362
275 (tpg
->se_tpg_tfo
->get_fabric_proto_ident(tpg
) << 4);
276 buf
[off
++] |= 0x1; /* CODE SET == Binary */
277 buf
[off
] = 0x80; /* Set PIV=1 */
278 /* Set ASSOCIATION == target port: 01b */
280 /* DESIGNATOR TYPE == Relative target port identifer */
282 off
++; /* Skip over Reserved */
283 buf
[off
++] = 4; /* DESIGNATOR LENGTH */
284 /* Skip over Obsolete field in RTPI payload
287 buf
[off
++] = ((port
->sep_rtpi
>> 8) & 0xff);
288 buf
[off
++] = (port
->sep_rtpi
& 0xff);
289 len
+= 8; /* Header size + Designation descriptor */
291 * Target port group identifier, see spc4r17
294 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
295 * section 7.5.1 Table 362
297 if (dev
->t10_alua
.alua_type
!= SPC3_ALUA_EMULATED
)
298 goto check_scsi_name
;
300 tg_pt_gp_mem
= port
->sep_alua_tg_pt_gp_mem
;
304 spin_lock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
305 tg_pt_gp
= tg_pt_gp_mem
->tg_pt_gp
;
307 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
310 tg_pt_gp_id
= tg_pt_gp
->tg_pt_gp_id
;
311 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
314 (tpg
->se_tpg_tfo
->get_fabric_proto_ident(tpg
) << 4);
315 buf
[off
++] |= 0x1; /* CODE SET == Binary */
316 buf
[off
] = 0x80; /* Set PIV=1 */
317 /* Set ASSOCIATION == target port: 01b */
319 /* DESIGNATOR TYPE == Target port group identifier */
321 off
++; /* Skip over Reserved */
322 buf
[off
++] = 4; /* DESIGNATOR LENGTH */
323 off
+= 2; /* Skip over Reserved Field */
324 buf
[off
++] = ((tg_pt_gp_id
>> 8) & 0xff);
325 buf
[off
++] = (tg_pt_gp_id
& 0xff);
326 len
+= 8; /* Header size + Designation descriptor */
328 * Logical Unit Group identifier, see spc4r17
332 lu_gp_mem
= dev
->dev_alua_lu_gp_mem
;
334 goto check_scsi_name
;
336 spin_lock(&lu_gp_mem
->lu_gp_mem_lock
);
337 lu_gp
= lu_gp_mem
->lu_gp
;
339 spin_unlock(&lu_gp_mem
->lu_gp_mem_lock
);
340 goto check_scsi_name
;
342 lu_gp_id
= lu_gp
->lu_gp_id
;
343 spin_unlock(&lu_gp_mem
->lu_gp_mem_lock
);
345 buf
[off
++] |= 0x1; /* CODE SET == Binary */
346 /* DESIGNATOR TYPE == Logical Unit Group identifier */
348 off
++; /* Skip over Reserved */
349 buf
[off
++] = 4; /* DESIGNATOR LENGTH */
350 off
+= 2; /* Skip over Reserved Field */
351 buf
[off
++] = ((lu_gp_id
>> 8) & 0xff);
352 buf
[off
++] = (lu_gp_id
& 0xff);
353 len
+= 8; /* Header size + Designation descriptor */
355 * SCSI name string designator, see spc4r17
358 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
359 * section 7.5.1 Table 362
362 scsi_name_len
= strlen(tpg
->se_tpg_tfo
->tpg_get_wwn(tpg
));
363 /* UTF-8 ",t,0x<16-bit TPGT>" + NULL Terminator */
365 /* Check for 4-byte padding */
366 padding
= ((-scsi_name_len
) & 3);
368 scsi_name_len
+= padding
;
369 /* Header size + Designation descriptor */
373 (tpg
->se_tpg_tfo
->get_fabric_proto_ident(tpg
) << 4);
374 buf
[off
++] |= 0x3; /* CODE SET == UTF-8 */
375 buf
[off
] = 0x80; /* Set PIV=1 */
376 /* Set ASSOCIATION == target port: 01b */
378 /* DESIGNATOR TYPE == SCSI name string */
380 off
+= 2; /* Skip over Reserved and length */
382 * SCSI name string identifer containing, $FABRIC_MOD
383 * dependent information. For LIO-Target and iSCSI
384 * Target Port, this means "<iSCSI name>,t,0x<TPGT> in
387 tpgt
= tpg
->se_tpg_tfo
->tpg_get_tag(tpg
);
388 scsi_name_len
= sprintf(&buf
[off
], "%s,t,0x%04x",
389 tpg
->se_tpg_tfo
->tpg_get_wwn(tpg
), tpgt
);
390 scsi_name_len
+= 1 /* Include NULL terminator */;
392 * The null-terminated, null-padded (see 4.4.2) SCSI
393 * NAME STRING field contains a UTF-8 format string.
394 * The number of bytes in the SCSI NAME STRING field
395 * (i.e., the value in the DESIGNATOR LENGTH field)
396 * shall be no larger than 256 and shall be a multiple
400 scsi_name_len
+= padding
;
402 buf
[off
-1] = scsi_name_len
;
403 off
+= scsi_name_len
;
404 /* Header size + Designation descriptor */
405 len
+= (scsi_name_len
+ 4);
407 buf
[2] = ((len
>> 8) & 0xff);
408 buf
[3] = (len
& 0xff); /* Page Length for VPD 0x83 */
412 /* Extended INQUIRY Data VPD Page */
413 static int spc_emulate_evpd_86(struct se_cmd
*cmd
, unsigned char *buf
)
416 /* Set HEADSUP, ORDSUP, SIMPSUP */
419 /* If WriteCache emulation is enabled, set V_SUP */
420 if (cmd
->se_dev
->dev_attrib
.emulate_write_cache
> 0)
425 /* Block Limits VPD page */
426 static int spc_emulate_evpd_b0(struct se_cmd
*cmd
, unsigned char *buf
)
428 struct se_device
*dev
= cmd
->se_dev
;
433 * Following spc3r22 section 6.5.3 Block Limits VPD page, when
434 * emulate_tpu=1 or emulate_tpws=1 we will be expect a
435 * different page length for Thin Provisioning.
437 if (dev
->dev_attrib
.emulate_tpu
|| dev
->dev_attrib
.emulate_tpws
)
440 buf
[0] = dev
->transport
->get_device_type(dev
);
441 buf
[3] = have_tp
? 0x3c : 0x10;
447 * Set OPTIMAL TRANSFER LENGTH GRANULARITY
449 put_unaligned_be16(1, &buf
[6]);
452 * Set MAXIMUM TRANSFER LENGTH
454 max_sectors
= min(dev
->dev_attrib
.fabric_max_sectors
,
455 dev
->dev_attrib
.hw_max_sectors
);
456 put_unaligned_be32(max_sectors
, &buf
[8]);
459 * Set OPTIMAL TRANSFER LENGTH
461 put_unaligned_be32(dev
->dev_attrib
.optimal_sectors
, &buf
[12]);
464 * Exit now if we don't support TP.
470 * Set MAXIMUM UNMAP LBA COUNT
472 put_unaligned_be32(dev
->dev_attrib
.max_unmap_lba_count
, &buf
[20]);
475 * Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT
477 put_unaligned_be32(dev
->dev_attrib
.max_unmap_block_desc_count
,
481 * Set OPTIMAL UNMAP GRANULARITY
483 put_unaligned_be32(dev
->dev_attrib
.unmap_granularity
, &buf
[28]);
486 * UNMAP GRANULARITY ALIGNMENT
488 put_unaligned_be32(dev
->dev_attrib
.unmap_granularity_alignment
,
490 if (dev
->dev_attrib
.unmap_granularity_alignment
!= 0)
491 buf
[32] |= 0x80; /* Set the UGAVALID bit */
496 /* Block Device Characteristics VPD page */
497 static int spc_emulate_evpd_b1(struct se_cmd
*cmd
, unsigned char *buf
)
499 struct se_device
*dev
= cmd
->se_dev
;
501 buf
[0] = dev
->transport
->get_device_type(dev
);
503 buf
[5] = dev
->dev_attrib
.is_nonrot
? 1 : 0;
508 /* Thin Provisioning VPD */
509 static int spc_emulate_evpd_b2(struct se_cmd
*cmd
, unsigned char *buf
)
511 struct se_device
*dev
= cmd
->se_dev
;
514 * From spc3r22 section 6.5.4 Thin Provisioning VPD page:
516 * The PAGE LENGTH field is defined in SPC-4. If the DP bit is set to
517 * zero, then the page length shall be set to 0004h. If the DP bit
518 * is set to one, then the page length shall be set to the value
519 * defined in table 162.
521 buf
[0] = dev
->transport
->get_device_type(dev
);
524 * Set Hardcoded length mentioned above for DP=0
526 put_unaligned_be16(0x0004, &buf
[2]);
529 * The THRESHOLD EXPONENT field indicates the threshold set size in
530 * LBAs as a power of 2 (i.e., the threshold set size is equal to
531 * 2(threshold exponent)).
533 * Note that this is currently set to 0x00 as mkp says it will be
534 * changing again. We can enable this once it has settled in T10
535 * and is actually used by Linux/SCSI ML code.
540 * A TPU bit set to one indicates that the device server supports
541 * the UNMAP command (see 5.25). A TPU bit set to zero indicates
542 * that the device server does not support the UNMAP command.
544 if (dev
->dev_attrib
.emulate_tpu
!= 0)
548 * A TPWS bit set to one indicates that the device server supports
549 * the use of the WRITE SAME (16) command (see 5.42) to unmap LBAs.
550 * A TPWS bit set to zero indicates that the device server does not
551 * support the use of the WRITE SAME (16) command to unmap LBAs.
553 if (dev
->dev_attrib
.emulate_tpws
!= 0)
559 static int spc_emulate_evpd_00(struct se_cmd
*cmd
, unsigned char *buf
);
563 int (*emulate
)(struct se_cmd
*, unsigned char *);
564 } evpd_handlers
[] = {
565 { .page
= 0x00, .emulate
= spc_emulate_evpd_00
},
566 { .page
= 0x80, .emulate
= spc_emulate_evpd_80
},
567 { .page
= 0x83, .emulate
= spc_emulate_evpd_83
},
568 { .page
= 0x86, .emulate
= spc_emulate_evpd_86
},
569 { .page
= 0xb0, .emulate
= spc_emulate_evpd_b0
},
570 { .page
= 0xb1, .emulate
= spc_emulate_evpd_b1
},
571 { .page
= 0xb2, .emulate
= spc_emulate_evpd_b2
},
574 /* supported vital product data pages */
575 static int spc_emulate_evpd_00(struct se_cmd
*cmd
, unsigned char *buf
)
580 * Only report the INQUIRY EVPD=1 pages after a valid NAA
581 * Registered Extended LUN WWN has been set via ConfigFS
582 * during device creation/restart.
584 if (cmd
->se_dev
->dev_flags
& DF_EMULATED_VPD_UNIT_SERIAL
) {
585 buf
[3] = ARRAY_SIZE(evpd_handlers
);
586 for (p
= 0; p
< ARRAY_SIZE(evpd_handlers
); ++p
)
587 buf
[p
+ 4] = evpd_handlers
[p
].page
;
593 static int spc_emulate_inquiry(struct se_cmd
*cmd
)
595 struct se_device
*dev
= cmd
->se_dev
;
596 struct se_portal_group
*tpg
= cmd
->se_lun
->lun_sep
->sep_tpg
;
598 unsigned char *cdb
= cmd
->t_task_cdb
;
599 unsigned char buf
[SE_INQUIRY_BUF
];
602 memset(buf
, 0, SE_INQUIRY_BUF
);
604 if (dev
== tpg
->tpg_virt_lun0
.lun_se_dev
)
605 buf
[0] = 0x3f; /* Not connected */
607 buf
[0] = dev
->transport
->get_device_type(dev
);
609 if (!(cdb
[1] & 0x1)) {
611 pr_err("INQUIRY with EVPD==0 but PAGE CODE=%02x\n",
613 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
618 ret
= spc_emulate_inquiry_std(cmd
, buf
);
622 for (p
= 0; p
< ARRAY_SIZE(evpd_handlers
); ++p
) {
623 if (cdb
[2] == evpd_handlers
[p
].page
) {
625 ret
= evpd_handlers
[p
].emulate(cmd
, buf
);
630 pr_err("Unknown VPD Code: 0x%02x\n", cdb
[2]);
631 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
635 rbuf
= transport_kmap_data_sg(cmd
);
637 memcpy(rbuf
, buf
, min_t(u32
, sizeof(buf
), cmd
->data_length
));
638 transport_kunmap_data_sg(cmd
);
642 target_complete_cmd(cmd
, GOOD
);
646 static int spc_modesense_rwrecovery(unsigned char *p
)
654 static int spc_modesense_control(struct se_device
*dev
, unsigned char *p
)
660 * From spc4r23, 7.4.7 Control mode page
662 * The QUEUE ALGORITHM MODIFIER field (see table 368) specifies
663 * restrictions on the algorithm used for reordering commands
664 * having the SIMPLE task attribute (see SAM-4).
666 * Table 368 -- QUEUE ALGORITHM MODIFIER field
668 * 0h Restricted reordering
669 * 1h Unrestricted reordering allowed
671 * 8h to Fh Vendor specific
673 * A value of zero in the QUEUE ALGORITHM MODIFIER field specifies that
674 * the device server shall order the processing sequence of commands
675 * having the SIMPLE task attribute such that data integrity is maintained
676 * for that I_T nexus (i.e., if the transmission of new SCSI transport protocol
677 * requests is halted at any time, the final value of all data observable
678 * on the medium shall be the same as if all the commands had been processed
679 * with the ORDERED task attribute).
681 * A value of one in the QUEUE ALGORITHM MODIFIER field specifies that the
682 * device server may reorder the processing sequence of commands having the
683 * SIMPLE task attribute in any manner. Any data integrity exposures related to
684 * command sequence order shall be explicitly handled by the application client
685 * through the selection of appropriate ommands and task attributes.
687 p
[3] = (dev
->dev_attrib
.emulate_rest_reord
== 1) ? 0x00 : 0x10;
689 * From spc4r17, section 7.4.6 Control mode Page
691 * Unit Attention interlocks control (UN_INTLCK_CTRL) to code 00b
693 * 00b: The logical unit shall clear any unit attention condition
694 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
695 * status and shall not establish a unit attention condition when a com-
696 * mand is completed with BUSY, TASK SET FULL, or RESERVATION CONFLICT
699 * 10b: The logical unit shall not clear any unit attention condition
700 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
701 * status and shall not establish a unit attention condition when
702 * a command is completed with BUSY, TASK SET FULL, or RESERVATION
705 * 11b a The logical unit shall not clear any unit attention condition
706 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
707 * status and shall establish a unit attention condition for the
708 * initiator port associated with the I_T nexus on which the BUSY,
709 * TASK SET FULL, or RESERVATION CONFLICT status is being returned.
710 * Depending on the status, the additional sense code shall be set to
711 * PREVIOUS BUSY STATUS, PREVIOUS TASK SET FULL STATUS, or PREVIOUS
712 * RESERVATION CONFLICT STATUS. Until it is cleared by a REQUEST SENSE
713 * command, a unit attention condition shall be established only once
714 * for a BUSY, TASK SET FULL, or RESERVATION CONFLICT status regardless
715 * to the number of commands completed with one of those status codes.
717 p
[4] = (dev
->dev_attrib
.emulate_ua_intlck_ctrl
== 2) ? 0x30 :
718 (dev
->dev_attrib
.emulate_ua_intlck_ctrl
== 1) ? 0x20 : 0x00;
720 * From spc4r17, section 7.4.6 Control mode Page
722 * Task Aborted Status (TAS) bit set to zero.
724 * A task aborted status (TAS) bit set to zero specifies that aborted
725 * tasks shall be terminated by the device server without any response
726 * to the application client. A TAS bit set to one specifies that tasks
727 * aborted by the actions of an I_T nexus other than the I_T nexus on
728 * which the command was received shall be completed with TASK ABORTED
729 * status (see SAM-4).
731 p
[5] = (dev
->dev_attrib
.emulate_tas
) ? 0x40 : 0x00;
739 static int spc_modesense_caching(struct se_device
*dev
, unsigned char *p
)
743 if (dev
->dev_attrib
.emulate_write_cache
> 0)
744 p
[2] = 0x04; /* Write Cache Enable */
745 p
[12] = 0x20; /* Disabled Read Ahead */
750 static void spc_modesense_write_protect(unsigned char *buf
, int type
)
753 * I believe that the WP bit (bit 7) in the mode header is the same for
760 buf
[0] |= 0x80; /* WP bit */
765 static void spc_modesense_dpofua(unsigned char *buf
, int type
)
769 buf
[0] |= 0x10; /* DPOFUA bit */
776 static int spc_emulate_modesense(struct se_cmd
*cmd
)
778 struct se_device
*dev
= cmd
->se_dev
;
779 char *cdb
= cmd
->t_task_cdb
;
781 int type
= dev
->transport
->get_device_type(dev
);
782 int ten
= (cmd
->t_task_cdb
[0] == MODE_SENSE_10
);
783 u32 offset
= ten
? 8 : 4;
785 unsigned char buf
[SE_MODE_PAGE_BUF
];
787 memset(buf
, 0, SE_MODE_PAGE_BUF
);
789 switch (cdb
[2] & 0x3f) {
791 length
= spc_modesense_rwrecovery(&buf
[offset
]);
794 length
= spc_modesense_caching(dev
, &buf
[offset
]);
797 length
= spc_modesense_control(dev
, &buf
[offset
]);
800 length
= spc_modesense_rwrecovery(&buf
[offset
]);
801 length
+= spc_modesense_caching(dev
, &buf
[offset
+length
]);
802 length
+= spc_modesense_control(dev
, &buf
[offset
+length
]);
805 pr_err("MODE SENSE: unimplemented page/subpage: 0x%02x/0x%02x\n",
806 cdb
[2] & 0x3f, cdb
[3]);
807 cmd
->scsi_sense_reason
= TCM_UNKNOWN_MODE_PAGE
;
814 buf
[0] = (offset
>> 8) & 0xff;
815 buf
[1] = offset
& 0xff;
818 if ((cmd
->se_lun
->lun_access
& TRANSPORT_LUNFLAGS_READ_ONLY
) ||
820 (cmd
->se_deve
->lun_flags
& TRANSPORT_LUNFLAGS_READ_ONLY
)))
821 spc_modesense_write_protect(&buf
[3], type
);
823 if ((dev
->dev_attrib
.emulate_write_cache
> 0) &&
824 (dev
->dev_attrib
.emulate_fua_write
> 0))
825 spc_modesense_dpofua(&buf
[3], type
);
828 buf
[0] = offset
& 0xff;
831 if ((cmd
->se_lun
->lun_access
& TRANSPORT_LUNFLAGS_READ_ONLY
) ||
833 (cmd
->se_deve
->lun_flags
& TRANSPORT_LUNFLAGS_READ_ONLY
)))
834 spc_modesense_write_protect(&buf
[2], type
);
836 if ((dev
->dev_attrib
.emulate_write_cache
> 0) &&
837 (dev
->dev_attrib
.emulate_fua_write
> 0))
838 spc_modesense_dpofua(&buf
[2], type
);
841 rbuf
= transport_kmap_data_sg(cmd
);
843 memcpy(rbuf
, buf
, min(offset
, cmd
->data_length
));
844 transport_kunmap_data_sg(cmd
);
847 target_complete_cmd(cmd
, GOOD
);
851 static int spc_emulate_request_sense(struct se_cmd
*cmd
)
853 unsigned char *cdb
= cmd
->t_task_cdb
;
855 u8 ua_asc
= 0, ua_ascq
= 0;
856 unsigned char buf
[SE_SENSE_BUF
];
858 memset(buf
, 0, SE_SENSE_BUF
);
861 pr_err("REQUEST_SENSE description emulation not"
863 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
867 rbuf
= transport_kmap_data_sg(cmd
);
868 if (cmd
->scsi_sense_reason
!= 0) {
870 * Out of memory. We will fail with CHECK CONDITION, so
871 * we must not clear the unit attention condition.
873 target_complete_cmd(cmd
, CHECK_CONDITION
);
875 } else if (!core_scsi3_ua_clear_for_request_sense(cmd
, &ua_asc
, &ua_ascq
)) {
877 * CURRENT ERROR, UNIT ATTENTION
880 buf
[SPC_SENSE_KEY_OFFSET
] = UNIT_ATTENTION
;
883 * The Additional Sense Code (ASC) from the UNIT ATTENTION
885 buf
[SPC_ASC_KEY_OFFSET
] = ua_asc
;
886 buf
[SPC_ASCQ_KEY_OFFSET
] = ua_ascq
;
890 * CURRENT ERROR, NO SENSE
893 buf
[SPC_SENSE_KEY_OFFSET
] = NO_SENSE
;
896 * NO ADDITIONAL SENSE INFORMATION
898 buf
[SPC_ASC_KEY_OFFSET
] = 0x00;
903 memcpy(rbuf
, buf
, min_t(u32
, sizeof(buf
), cmd
->data_length
));
904 transport_kunmap_data_sg(cmd
);
907 target_complete_cmd(cmd
, GOOD
);
911 static int spc_emulate_testunitready(struct se_cmd
*cmd
)
913 target_complete_cmd(cmd
, GOOD
);
917 int spc_parse_cdb(struct se_cmd
*cmd
, unsigned int *size
)
919 struct se_device
*dev
= cmd
->se_dev
;
920 unsigned char *cdb
= cmd
->t_task_cdb
;
927 *size
= (cdb
[7] << 8) + cdb
[8];
931 cmd
->execute_cmd
= spc_emulate_modesense
;
934 *size
= (cdb
[7] << 8) + cdb
[8];
935 cmd
->execute_cmd
= spc_emulate_modesense
;
939 *size
= (cdb
[7] << 8) + cdb
[8];
941 case PERSISTENT_RESERVE_IN
:
942 if (dev
->t10_pr
.res_type
== SPC3_PERSISTENT_RESERVATIONS
)
943 cmd
->execute_cmd
= target_scsi3_emulate_pr_in
;
944 *size
= (cdb
[7] << 8) + cdb
[8];
946 case PERSISTENT_RESERVE_OUT
:
947 if (dev
->t10_pr
.res_type
== SPC3_PERSISTENT_RESERVATIONS
)
948 cmd
->execute_cmd
= target_scsi3_emulate_pr_out
;
949 *size
= (cdb
[7] << 8) + cdb
[8];
953 if (cdb
[0] == RELEASE_10
)
954 *size
= (cdb
[7] << 8) | cdb
[8];
956 *size
= cmd
->data_length
;
958 if (dev
->t10_pr
.res_type
!= SPC_PASSTHROUGH
)
959 cmd
->execute_cmd
= target_scsi2_reservation_release
;
964 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
965 * Assume the passthrough or $FABRIC_MOD will tell us about it.
967 if (cdb
[0] == RESERVE_10
)
968 *size
= (cdb
[7] << 8) | cdb
[8];
970 *size
= cmd
->data_length
;
973 * Setup the legacy emulated handler for SPC-2 and
974 * >= SPC-3 compatible reservation handling (CRH=1)
975 * Otherwise, we assume the underlying SCSI logic is
976 * is running in SPC_PASSTHROUGH, and wants reservations
977 * emulation disabled.
979 if (dev
->t10_pr
.res_type
!= SPC_PASSTHROUGH
)
980 cmd
->execute_cmd
= target_scsi2_reservation_reserve
;
984 cmd
->execute_cmd
= spc_emulate_request_sense
;
987 *size
= (cdb
[3] << 8) + cdb
[4];
990 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
991 * See spc4r17 section 5.3
993 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
994 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
995 cmd
->execute_cmd
= spc_emulate_inquiry
;
997 case SECURITY_PROTOCOL_IN
:
998 case SECURITY_PROTOCOL_OUT
:
999 *size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
1002 case READ_ATTRIBUTE
:
1003 case RECEIVE_COPY_RESULTS
:
1004 case WRITE_ATTRIBUTE
:
1005 *size
= (cdb
[10] << 24) | (cdb
[11] << 16) |
1006 (cdb
[12] << 8) | cdb
[13];
1008 case RECEIVE_DIAGNOSTIC
:
1009 case SEND_DIAGNOSTIC
:
1010 *size
= (cdb
[3] << 8) | cdb
[4];
1013 *size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
1016 cmd
->execute_cmd
= target_report_luns
;
1017 *size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
1019 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
1020 * See spc4r17 section 5.3
1022 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
1023 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
1025 case TEST_UNIT_READY
:
1026 cmd
->execute_cmd
= spc_emulate_testunitready
;
1029 case MAINTENANCE_IN
:
1030 if (dev
->transport
->get_device_type(dev
) != TYPE_ROM
) {
1032 * MAINTENANCE_IN from SCC-2
1033 * Check for emulated MI_REPORT_TARGET_PGS
1035 if ((cdb
[1] & 0x1f) == MI_REPORT_TARGET_PGS
&&
1036 dev
->t10_alua
.alua_type
== SPC3_ALUA_EMULATED
) {
1038 target_emulate_report_target_port_groups
;
1040 *size
= get_unaligned_be32(&cdb
[6]);
1043 * GPCMD_SEND_KEY from multi media commands
1045 *size
= get_unaligned_be16(&cdb
[8]);
1048 case MAINTENANCE_OUT
:
1049 if (dev
->transport
->get_device_type(dev
) != TYPE_ROM
) {
1051 * MAINTENANCE_OUT from SCC-2
1052 * Check for emulated MO_SET_TARGET_PGS.
1054 if (cdb
[1] == MO_SET_TARGET_PGS
&&
1055 dev
->t10_alua
.alua_type
== SPC3_ALUA_EMULATED
) {
1057 target_emulate_set_target_port_groups
;
1059 *size
= get_unaligned_be32(&cdb
[6]);
1062 * GPCMD_SEND_KEY from multi media commands
1064 *size
= get_unaligned_be16(&cdb
[8]);
1068 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
1069 " 0x%02x, sending CHECK_CONDITION.\n",
1070 cmd
->se_tfo
->get_fabric_name(), cdb
[0]);
1071 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1072 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
1078 EXPORT_SYMBOL(spc_parse_cdb
);