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_pr.h"
39 #include "target_core_ua.h"
42 static void spc_fill_alua_data(struct se_port
*port
, unsigned char *buf
)
44 struct t10_alua_tg_pt_gp
*tg_pt_gp
;
45 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
;
48 * Set SCCS for MAINTENANCE_IN + REPORT_TARGET_PORT_GROUPS.
53 * Set TPGS field for explict and/or implict ALUA access type
56 * See spc4r17 section 6.4.2 Table 135
60 tg_pt_gp_mem
= port
->sep_alua_tg_pt_gp_mem
;
64 spin_lock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
65 tg_pt_gp
= tg_pt_gp_mem
->tg_pt_gp
;
67 buf
[5] |= tg_pt_gp
->tg_pt_gp_alua_access_type
;
68 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
71 static int spc_emulate_inquiry_std(struct se_cmd
*cmd
, char *buf
)
73 struct se_lun
*lun
= cmd
->se_lun
;
74 struct se_device
*dev
= cmd
->se_dev
;
76 /* Set RMB (removable media) for tape devices */
77 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
)
80 buf
[2] = dev
->transport
->get_device_rev(dev
);
83 * NORMACA and HISUP = 0, RESPONSE DATA FORMAT = 2
86 * A RESPONSE DATA FORMAT field set to 2h indicates that the
87 * standard INQUIRY data is in the format defined in this
88 * standard. Response data format values less than 2h are
89 * obsolete. Response data format values greater than 2h are
95 * Enable SCCS and TPGS fields for Emulated ALUA
97 if (dev
->se_sub_dev
->t10_alua
.alua_type
== SPC3_ALUA_EMULATED
)
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
->se_sub_dev
->t10_wwn
.model
);
104 snprintf(&buf
[32], 4, "%s", dev
->se_sub_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
->se_sub_dev
->su_dev_flags
&
117 SDF_EMULATED_VPD_UNIT_SERIAL
) {
120 unit_serial_len
= strlen(dev
->se_sub_dev
->t10_wwn
.unit_serial
);
121 unit_serial_len
++; /* For NULL Terminator */
123 len
+= sprintf(&buf
[4], "%s",
124 dev
->se_sub_dev
->t10_wwn
.unit_serial
);
125 len
++; /* Extra Byte for NULL Terminator */
131 static void spc_parse_naa_6h_vendor_specific(struct se_device
*dev
,
134 unsigned char *p
= &dev
->se_sub_dev
->t10_wwn
.unit_serial
[0];
139 * Generate up to 36 bits of VENDOR SPECIFIC IDENTIFIER starting on
140 * byte 3 bit 3-0 for NAA IEEE Registered Extended DESIGNATOR field
141 * format, followed by 64 bits of VENDOR SPECIFIC IDENTIFIER EXTENSION
142 * to complete the payload. These are based from VPD=0x80 PRODUCT SERIAL
143 * NUMBER set via vpd_unit_serial in target_core_configfs.c to ensure
144 * per device uniqeness.
146 for (cnt
= 0; *p
&& cnt
< 13; p
++) {
147 int val
= hex_to_bin(*p
);
163 * Device identification VPD, for a complete list of
164 * DESIGNATOR TYPEs see spc4r17 Table 459.
166 static int spc_emulate_evpd_83(struct se_cmd
*cmd
, unsigned char *buf
)
168 struct se_device
*dev
= cmd
->se_dev
;
169 struct se_lun
*lun
= cmd
->se_lun
;
170 struct se_port
*port
= NULL
;
171 struct se_portal_group
*tpg
= NULL
;
172 struct t10_alua_lu_gp_member
*lu_gp_mem
;
173 struct t10_alua_tg_pt_gp
*tg_pt_gp
;
174 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
;
175 unsigned char *prod
= &dev
->se_sub_dev
->t10_wwn
.model
[0];
177 u32 unit_serial_len
, off
= 0;
183 * NAA IEEE Registered Extended Assigned designator format, see
184 * spc4r17 section 7.7.3.6.5
186 * We depend upon a target_core_mod/ConfigFS provided
187 * /sys/kernel/config/target/core/$HBA/$DEV/wwn/vpd_unit_serial
188 * value in order to return the NAA id.
190 if (!(dev
->se_sub_dev
->su_dev_flags
& SDF_EMULATED_VPD_UNIT_SERIAL
))
191 goto check_t10_vend_desc
;
193 /* CODE SET == Binary */
196 /* Set ASSOCIATION == addressed logical unit: 0)b */
199 /* Identifier/Designator type == NAA identifier */
203 /* Identifier/Designator length */
207 * Start NAA IEEE Registered Extended Identifier/Designator
209 buf
[off
++] = (0x6 << 4);
212 * Use OpenFabrics IEEE Company ID: 00 14 05
216 buf
[off
] = (0x5 << 4);
219 * Return ConfigFS Unit Serial Number information for
220 * VENDOR_SPECIFIC_IDENTIFIER and
221 * VENDOR_SPECIFIC_IDENTIFIER_EXTENTION
223 spc_parse_naa_6h_vendor_specific(dev
, &buf
[off
]);
230 * T10 Vendor Identifier Page, see spc4r17 section 7.7.3.4
232 id_len
= 8; /* For Vendor field */
233 prod_len
= 4; /* For VPD Header */
234 prod_len
+= 8; /* For Vendor field */
235 prod_len
+= strlen(prod
);
236 prod_len
++; /* For : */
238 if (dev
->se_sub_dev
->su_dev_flags
&
239 SDF_EMULATED_VPD_UNIT_SERIAL
) {
241 strlen(&dev
->se_sub_dev
->t10_wwn
.unit_serial
[0]);
242 unit_serial_len
++; /* For NULL Terminator */
244 id_len
+= sprintf(&buf
[off
+12], "%s:%s", prod
,
245 &dev
->se_sub_dev
->t10_wwn
.unit_serial
[0]);
247 buf
[off
] = 0x2; /* ASCII */
248 buf
[off
+1] = 0x1; /* T10 Vendor ID */
250 memcpy(&buf
[off
+4], "LIO-ORG", 8);
251 /* Extra Byte for NULL Terminator */
253 /* Identifier Length */
255 /* Header size for Designation descriptor */
259 * struct se_port is only set for INQUIRY VPD=1 through $FABRIC_MOD
263 struct t10_alua_lu_gp
*lu_gp
;
264 u32 padding
, scsi_name_len
;
271 * Relative target port identifer, see spc4r17
274 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
275 * section 7.5.1 Table 362
278 (tpg
->se_tpg_tfo
->get_fabric_proto_ident(tpg
) << 4);
279 buf
[off
++] |= 0x1; /* CODE SET == Binary */
280 buf
[off
] = 0x80; /* Set PIV=1 */
281 /* Set ASSOCIATION == target port: 01b */
283 /* DESIGNATOR TYPE == Relative target port identifer */
285 off
++; /* Skip over Reserved */
286 buf
[off
++] = 4; /* DESIGNATOR LENGTH */
287 /* Skip over Obsolete field in RTPI payload
290 buf
[off
++] = ((port
->sep_rtpi
>> 8) & 0xff);
291 buf
[off
++] = (port
->sep_rtpi
& 0xff);
292 len
+= 8; /* Header size + Designation descriptor */
294 * Target port group identifier, see spc4r17
297 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
298 * section 7.5.1 Table 362
300 if (dev
->se_sub_dev
->t10_alua
.alua_type
!=
302 goto check_scsi_name
;
304 tg_pt_gp_mem
= port
->sep_alua_tg_pt_gp_mem
;
308 spin_lock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
309 tg_pt_gp
= tg_pt_gp_mem
->tg_pt_gp
;
311 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
314 tg_pt_gp_id
= tg_pt_gp
->tg_pt_gp_id
;
315 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
318 (tpg
->se_tpg_tfo
->get_fabric_proto_ident(tpg
) << 4);
319 buf
[off
++] |= 0x1; /* CODE SET == Binary */
320 buf
[off
] = 0x80; /* Set PIV=1 */
321 /* Set ASSOCIATION == target port: 01b */
323 /* DESIGNATOR TYPE == Target port group identifier */
325 off
++; /* Skip over Reserved */
326 buf
[off
++] = 4; /* DESIGNATOR LENGTH */
327 off
+= 2; /* Skip over Reserved Field */
328 buf
[off
++] = ((tg_pt_gp_id
>> 8) & 0xff);
329 buf
[off
++] = (tg_pt_gp_id
& 0xff);
330 len
+= 8; /* Header size + Designation descriptor */
332 * Logical Unit Group identifier, see spc4r17
336 lu_gp_mem
= dev
->dev_alua_lu_gp_mem
;
338 goto check_scsi_name
;
340 spin_lock(&lu_gp_mem
->lu_gp_mem_lock
);
341 lu_gp
= lu_gp_mem
->lu_gp
;
343 spin_unlock(&lu_gp_mem
->lu_gp_mem_lock
);
344 goto check_scsi_name
;
346 lu_gp_id
= lu_gp
->lu_gp_id
;
347 spin_unlock(&lu_gp_mem
->lu_gp_mem_lock
);
349 buf
[off
++] |= 0x1; /* CODE SET == Binary */
350 /* DESIGNATOR TYPE == Logical Unit Group identifier */
352 off
++; /* Skip over Reserved */
353 buf
[off
++] = 4; /* DESIGNATOR LENGTH */
354 off
+= 2; /* Skip over Reserved Field */
355 buf
[off
++] = ((lu_gp_id
>> 8) & 0xff);
356 buf
[off
++] = (lu_gp_id
& 0xff);
357 len
+= 8; /* Header size + Designation descriptor */
359 * SCSI name string designator, see spc4r17
362 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
363 * section 7.5.1 Table 362
366 scsi_name_len
= strlen(tpg
->se_tpg_tfo
->tpg_get_wwn(tpg
));
367 /* UTF-8 ",t,0x<16-bit TPGT>" + NULL Terminator */
369 /* Check for 4-byte padding */
370 padding
= ((-scsi_name_len
) & 3);
372 scsi_name_len
+= padding
;
373 /* Header size + Designation descriptor */
377 (tpg
->se_tpg_tfo
->get_fabric_proto_ident(tpg
) << 4);
378 buf
[off
++] |= 0x3; /* CODE SET == UTF-8 */
379 buf
[off
] = 0x80; /* Set PIV=1 */
380 /* Set ASSOCIATION == target port: 01b */
382 /* DESIGNATOR TYPE == SCSI name string */
384 off
+= 2; /* Skip over Reserved and length */
386 * SCSI name string identifer containing, $FABRIC_MOD
387 * dependent information. For LIO-Target and iSCSI
388 * Target Port, this means "<iSCSI name>,t,0x<TPGT> in
391 tpgt
= tpg
->se_tpg_tfo
->tpg_get_tag(tpg
);
392 scsi_name_len
= sprintf(&buf
[off
], "%s,t,0x%04x",
393 tpg
->se_tpg_tfo
->tpg_get_wwn(tpg
), tpgt
);
394 scsi_name_len
+= 1 /* Include NULL terminator */;
396 * The null-terminated, null-padded (see 4.4.2) SCSI
397 * NAME STRING field contains a UTF-8 format string.
398 * The number of bytes in the SCSI NAME STRING field
399 * (i.e., the value in the DESIGNATOR LENGTH field)
400 * shall be no larger than 256 and shall be a multiple
404 scsi_name_len
+= padding
;
406 buf
[off
-1] = scsi_name_len
;
407 off
+= scsi_name_len
;
408 /* Header size + Designation descriptor */
409 len
+= (scsi_name_len
+ 4);
411 buf
[2] = ((len
>> 8) & 0xff);
412 buf
[3] = (len
& 0xff); /* Page Length for VPD 0x83 */
416 /* Extended INQUIRY Data VPD Page */
417 static int spc_emulate_evpd_86(struct se_cmd
*cmd
, unsigned char *buf
)
420 /* Set HEADSUP, ORDSUP, SIMPSUP */
423 /* If WriteCache emulation is enabled, set V_SUP */
424 if (cmd
->se_dev
->se_sub_dev
->se_dev_attrib
.emulate_write_cache
> 0)
429 /* Block Limits VPD page */
430 static int spc_emulate_evpd_b0(struct se_cmd
*cmd
, unsigned char *buf
)
432 struct se_device
*dev
= cmd
->se_dev
;
437 * Following spc3r22 section 6.5.3 Block Limits VPD page, when
438 * emulate_tpu=1 or emulate_tpws=1 we will be expect a
439 * different page length for Thin Provisioning.
441 if (dev
->se_sub_dev
->se_dev_attrib
.emulate_tpu
|| dev
->se_sub_dev
->se_dev_attrib
.emulate_tpws
)
444 buf
[0] = dev
->transport
->get_device_type(dev
);
445 buf
[3] = have_tp
? 0x3c : 0x10;
451 * Set OPTIMAL TRANSFER LENGTH GRANULARITY
453 put_unaligned_be16(1, &buf
[6]);
456 * Set MAXIMUM TRANSFER LENGTH
458 max_sectors
= min(dev
->se_sub_dev
->se_dev_attrib
.fabric_max_sectors
,
459 dev
->se_sub_dev
->se_dev_attrib
.hw_max_sectors
);
460 put_unaligned_be32(max_sectors
, &buf
[8]);
463 * Set OPTIMAL TRANSFER LENGTH
465 put_unaligned_be32(dev
->se_sub_dev
->se_dev_attrib
.optimal_sectors
, &buf
[12]);
468 * Exit now if we don't support TP.
474 * Set MAXIMUM UNMAP LBA COUNT
476 put_unaligned_be32(dev
->se_sub_dev
->se_dev_attrib
.max_unmap_lba_count
, &buf
[20]);
479 * Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT
481 put_unaligned_be32(dev
->se_sub_dev
->se_dev_attrib
.max_unmap_block_desc_count
,
485 * Set OPTIMAL UNMAP GRANULARITY
487 put_unaligned_be32(dev
->se_sub_dev
->se_dev_attrib
.unmap_granularity
, &buf
[28]);
490 * UNMAP GRANULARITY ALIGNMENT
492 put_unaligned_be32(dev
->se_sub_dev
->se_dev_attrib
.unmap_granularity_alignment
,
494 if (dev
->se_sub_dev
->se_dev_attrib
.unmap_granularity_alignment
!= 0)
495 buf
[32] |= 0x80; /* Set the UGAVALID bit */
500 /* Block Device Characteristics VPD page */
501 static int spc_emulate_evpd_b1(struct se_cmd
*cmd
, unsigned char *buf
)
503 struct se_device
*dev
= cmd
->se_dev
;
505 buf
[0] = dev
->transport
->get_device_type(dev
);
507 buf
[5] = dev
->se_sub_dev
->se_dev_attrib
.is_nonrot
? 1 : 0;
512 /* Thin Provisioning VPD */
513 static int spc_emulate_evpd_b2(struct se_cmd
*cmd
, unsigned char *buf
)
515 struct se_device
*dev
= cmd
->se_dev
;
518 * From spc3r22 section 6.5.4 Thin Provisioning VPD page:
520 * The PAGE LENGTH field is defined in SPC-4. If the DP bit is set to
521 * zero, then the page length shall be set to 0004h. If the DP bit
522 * is set to one, then the page length shall be set to the value
523 * defined in table 162.
525 buf
[0] = dev
->transport
->get_device_type(dev
);
528 * Set Hardcoded length mentioned above for DP=0
530 put_unaligned_be16(0x0004, &buf
[2]);
533 * The THRESHOLD EXPONENT field indicates the threshold set size in
534 * LBAs as a power of 2 (i.e., the threshold set size is equal to
535 * 2(threshold exponent)).
537 * Note that this is currently set to 0x00 as mkp says it will be
538 * changing again. We can enable this once it has settled in T10
539 * and is actually used by Linux/SCSI ML code.
544 * A TPU bit set to one indicates that the device server supports
545 * the UNMAP command (see 5.25). A TPU bit set to zero indicates
546 * that the device server does not support the UNMAP command.
548 if (dev
->se_sub_dev
->se_dev_attrib
.emulate_tpu
!= 0)
552 * A TPWS bit set to one indicates that the device server supports
553 * the use of the WRITE SAME (16) command (see 5.42) to unmap LBAs.
554 * A TPWS bit set to zero indicates that the device server does not
555 * support the use of the WRITE SAME (16) command to unmap LBAs.
557 if (dev
->se_sub_dev
->se_dev_attrib
.emulate_tpws
!= 0)
563 static int spc_emulate_evpd_00(struct se_cmd
*cmd
, unsigned char *buf
);
567 int (*emulate
)(struct se_cmd
*, unsigned char *);
568 } evpd_handlers
[] = {
569 { .page
= 0x00, .emulate
= spc_emulate_evpd_00
},
570 { .page
= 0x80, .emulate
= spc_emulate_evpd_80
},
571 { .page
= 0x83, .emulate
= spc_emulate_evpd_83
},
572 { .page
= 0x86, .emulate
= spc_emulate_evpd_86
},
573 { .page
= 0xb0, .emulate
= spc_emulate_evpd_b0
},
574 { .page
= 0xb1, .emulate
= spc_emulate_evpd_b1
},
575 { .page
= 0xb2, .emulate
= spc_emulate_evpd_b2
},
578 /* supported vital product data pages */
579 static int spc_emulate_evpd_00(struct se_cmd
*cmd
, unsigned char *buf
)
584 * Only report the INQUIRY EVPD=1 pages after a valid NAA
585 * Registered Extended LUN WWN has been set via ConfigFS
586 * during device creation/restart.
588 if (cmd
->se_dev
->se_sub_dev
->su_dev_flags
&
589 SDF_EMULATED_VPD_UNIT_SERIAL
) {
590 buf
[3] = ARRAY_SIZE(evpd_handlers
);
591 for (p
= 0; p
< ARRAY_SIZE(evpd_handlers
); ++p
)
592 buf
[p
+ 4] = evpd_handlers
[p
].page
;
598 static int spc_emulate_inquiry(struct se_cmd
*cmd
)
600 struct se_device
*dev
= cmd
->se_dev
;
601 struct se_portal_group
*tpg
= cmd
->se_lun
->lun_sep
->sep_tpg
;
602 unsigned char *buf
, *map_buf
;
603 unsigned char *cdb
= cmd
->t_task_cdb
;
606 map_buf
= transport_kmap_data_sg(cmd
);
608 * If SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC is not set, then we
609 * know we actually allocated a full page. Otherwise, if the
610 * data buffer is too small, allocate a temporary buffer so we
611 * don't have to worry about overruns in all our INQUIRY
612 * emulation handling.
614 if (cmd
->data_length
< SE_INQUIRY_BUF
&&
615 (cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
)) {
616 buf
= kzalloc(SE_INQUIRY_BUF
, GFP_KERNEL
);
618 transport_kunmap_data_sg(cmd
);
619 cmd
->scsi_sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
626 if (dev
== tpg
->tpg_virt_lun0
.lun_se_dev
)
627 buf
[0] = 0x3f; /* Not connected */
629 buf
[0] = dev
->transport
->get_device_type(dev
);
631 if (!(cdb
[1] & 0x1)) {
633 pr_err("INQUIRY with EVPD==0 but PAGE CODE=%02x\n",
635 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
640 ret
= spc_emulate_inquiry_std(cmd
, buf
);
644 for (p
= 0; p
< ARRAY_SIZE(evpd_handlers
); ++p
) {
645 if (cdb
[2] == evpd_handlers
[p
].page
) {
647 ret
= evpd_handlers
[p
].emulate(cmd
, buf
);
652 pr_err("Unknown VPD Code: 0x%02x\n", cdb
[2]);
653 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
657 if (buf
!= map_buf
) {
658 memcpy(map_buf
, buf
, cmd
->data_length
);
661 transport_kunmap_data_sg(cmd
);
664 target_complete_cmd(cmd
, GOOD
);
668 static int spc_modesense_rwrecovery(unsigned char *p
)
676 static int spc_modesense_control(struct se_device
*dev
, unsigned char *p
)
682 * From spc4r23, 7.4.7 Control mode page
684 * The QUEUE ALGORITHM MODIFIER field (see table 368) specifies
685 * restrictions on the algorithm used for reordering commands
686 * having the SIMPLE task attribute (see SAM-4).
688 * Table 368 -- QUEUE ALGORITHM MODIFIER field
690 * 0h Restricted reordering
691 * 1h Unrestricted reordering allowed
693 * 8h to Fh Vendor specific
695 * A value of zero in the QUEUE ALGORITHM MODIFIER field specifies that
696 * the device server shall order the processing sequence of commands
697 * having the SIMPLE task attribute such that data integrity is maintained
698 * for that I_T nexus (i.e., if the transmission of new SCSI transport protocol
699 * requests is halted at any time, the final value of all data observable
700 * on the medium shall be the same as if all the commands had been processed
701 * with the ORDERED task attribute).
703 * A value of one in the QUEUE ALGORITHM MODIFIER field specifies that the
704 * device server may reorder the processing sequence of commands having the
705 * SIMPLE task attribute in any manner. Any data integrity exposures related to
706 * command sequence order shall be explicitly handled by the application client
707 * through the selection of appropriate ommands and task attributes.
709 p
[3] = (dev
->se_sub_dev
->se_dev_attrib
.emulate_rest_reord
== 1) ? 0x00 : 0x10;
711 * From spc4r17, section 7.4.6 Control mode Page
713 * Unit Attention interlocks control (UN_INTLCK_CTRL) to code 00b
715 * 00b: The logical unit shall clear any unit attention condition
716 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
717 * status and shall not establish a unit attention condition when a com-
718 * mand is completed with BUSY, TASK SET FULL, or RESERVATION CONFLICT
721 * 10b: The logical unit shall not clear any unit attention condition
722 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
723 * status and shall not establish a unit attention condition when
724 * a command is completed with BUSY, TASK SET FULL, or RESERVATION
727 * 11b a The logical unit shall not clear any unit attention condition
728 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
729 * status and shall establish a unit attention condition for the
730 * initiator port associated with the I_T nexus on which the BUSY,
731 * TASK SET FULL, or RESERVATION CONFLICT status is being returned.
732 * Depending on the status, the additional sense code shall be set to
733 * PREVIOUS BUSY STATUS, PREVIOUS TASK SET FULL STATUS, or PREVIOUS
734 * RESERVATION CONFLICT STATUS. Until it is cleared by a REQUEST SENSE
735 * command, a unit attention condition shall be established only once
736 * for a BUSY, TASK SET FULL, or RESERVATION CONFLICT status regardless
737 * to the number of commands completed with one of those status codes.
739 p
[4] = (dev
->se_sub_dev
->se_dev_attrib
.emulate_ua_intlck_ctrl
== 2) ? 0x30 :
740 (dev
->se_sub_dev
->se_dev_attrib
.emulate_ua_intlck_ctrl
== 1) ? 0x20 : 0x00;
742 * From spc4r17, section 7.4.6 Control mode Page
744 * Task Aborted Status (TAS) bit set to zero.
746 * A task aborted status (TAS) bit set to zero specifies that aborted
747 * tasks shall be terminated by the device server without any response
748 * to the application client. A TAS bit set to one specifies that tasks
749 * aborted by the actions of an I_T nexus other than the I_T nexus on
750 * which the command was received shall be completed with TASK ABORTED
751 * status (see SAM-4).
753 p
[5] = (dev
->se_sub_dev
->se_dev_attrib
.emulate_tas
) ? 0x40 : 0x00;
761 static int spc_modesense_caching(struct se_device
*dev
, unsigned char *p
)
765 if (dev
->se_sub_dev
->se_dev_attrib
.emulate_write_cache
> 0)
766 p
[2] = 0x04; /* Write Cache Enable */
767 p
[12] = 0x20; /* Disabled Read Ahead */
772 static void spc_modesense_write_protect(unsigned char *buf
, int type
)
775 * I believe that the WP bit (bit 7) in the mode header is the same for
782 buf
[0] |= 0x80; /* WP bit */
787 static void spc_modesense_dpofua(unsigned char *buf
, int type
)
791 buf
[0] |= 0x10; /* DPOFUA bit */
798 static int spc_emulate_modesense(struct se_cmd
*cmd
)
800 struct se_device
*dev
= cmd
->se_dev
;
801 char *cdb
= cmd
->t_task_cdb
;
803 int type
= dev
->transport
->get_device_type(dev
);
804 int ten
= (cmd
->t_task_cdb
[0] == MODE_SENSE_10
);
805 int offset
= ten
? 8 : 4;
807 unsigned char buf
[SE_MODE_PAGE_BUF
];
809 memset(buf
, 0, SE_MODE_PAGE_BUF
);
811 switch (cdb
[2] & 0x3f) {
813 length
= spc_modesense_rwrecovery(&buf
[offset
]);
816 length
= spc_modesense_caching(dev
, &buf
[offset
]);
819 length
= spc_modesense_control(dev
, &buf
[offset
]);
822 length
= spc_modesense_rwrecovery(&buf
[offset
]);
823 length
+= spc_modesense_caching(dev
, &buf
[offset
+length
]);
824 length
+= spc_modesense_control(dev
, &buf
[offset
+length
]);
827 pr_err("MODE SENSE: unimplemented page/subpage: 0x%02x/0x%02x\n",
828 cdb
[2] & 0x3f, cdb
[3]);
829 cmd
->scsi_sense_reason
= TCM_UNKNOWN_MODE_PAGE
;
836 buf
[0] = (offset
>> 8) & 0xff;
837 buf
[1] = offset
& 0xff;
839 if ((cmd
->se_lun
->lun_access
& TRANSPORT_LUNFLAGS_READ_ONLY
) ||
841 (cmd
->se_deve
->lun_flags
& TRANSPORT_LUNFLAGS_READ_ONLY
)))
842 spc_modesense_write_protect(&buf
[3], type
);
844 if ((dev
->se_sub_dev
->se_dev_attrib
.emulate_write_cache
> 0) &&
845 (dev
->se_sub_dev
->se_dev_attrib
.emulate_fua_write
> 0))
846 spc_modesense_dpofua(&buf
[3], type
);
848 if ((offset
+ 2) > cmd
->data_length
)
849 offset
= cmd
->data_length
;
853 buf
[0] = offset
& 0xff;
855 if ((cmd
->se_lun
->lun_access
& TRANSPORT_LUNFLAGS_READ_ONLY
) ||
857 (cmd
->se_deve
->lun_flags
& TRANSPORT_LUNFLAGS_READ_ONLY
)))
858 spc_modesense_write_protect(&buf
[2], type
);
860 if ((dev
->se_sub_dev
->se_dev_attrib
.emulate_write_cache
> 0) &&
861 (dev
->se_sub_dev
->se_dev_attrib
.emulate_fua_write
> 0))
862 spc_modesense_dpofua(&buf
[2], type
);
864 if ((offset
+ 1) > cmd
->data_length
)
865 offset
= cmd
->data_length
;
868 rbuf
= transport_kmap_data_sg(cmd
);
869 memcpy(rbuf
, buf
, offset
);
870 transport_kunmap_data_sg(cmd
);
872 target_complete_cmd(cmd
, GOOD
);
876 static int spc_emulate_request_sense(struct se_cmd
*cmd
)
878 unsigned char *cdb
= cmd
->t_task_cdb
;
880 u8 ua_asc
= 0, ua_ascq
= 0;
884 pr_err("REQUEST_SENSE description emulation not"
886 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
890 buf
= transport_kmap_data_sg(cmd
);
892 if (!core_scsi3_ua_clear_for_request_sense(cmd
, &ua_asc
, &ua_ascq
)) {
894 * CURRENT ERROR, UNIT ATTENTION
897 buf
[SPC_SENSE_KEY_OFFSET
] = UNIT_ATTENTION
;
899 if (cmd
->data_length
< 18) {
905 * The Additional Sense Code (ASC) from the UNIT ATTENTION
907 buf
[SPC_ASC_KEY_OFFSET
] = ua_asc
;
908 buf
[SPC_ASCQ_KEY_OFFSET
] = ua_ascq
;
912 * CURRENT ERROR, NO SENSE
915 buf
[SPC_SENSE_KEY_OFFSET
] = NO_SENSE
;
917 if (cmd
->data_length
< 18) {
923 * NO ADDITIONAL SENSE INFORMATION
925 buf
[SPC_ASC_KEY_OFFSET
] = 0x00;
930 transport_kunmap_data_sg(cmd
);
931 target_complete_cmd(cmd
, GOOD
);
935 static int spc_emulate_testunitready(struct se_cmd
*cmd
)
937 target_complete_cmd(cmd
, GOOD
);
941 int spc_parse_cdb(struct se_cmd
*cmd
, unsigned int *size
)
943 struct se_subsystem_dev
*su_dev
= cmd
->se_dev
->se_sub_dev
;
944 unsigned char *cdb
= cmd
->t_task_cdb
;
951 *size
= (cdb
[7] << 8) + cdb
[8];
955 cmd
->execute_cmd
= spc_emulate_modesense
;
958 *size
= (cdb
[7] << 8) + cdb
[8];
959 cmd
->execute_cmd
= spc_emulate_modesense
;
963 *size
= (cdb
[7] << 8) + cdb
[8];
965 case PERSISTENT_RESERVE_IN
:
966 if (su_dev
->t10_pr
.res_type
== SPC3_PERSISTENT_RESERVATIONS
)
967 cmd
->execute_cmd
= target_scsi3_emulate_pr_in
;
968 *size
= (cdb
[7] << 8) + cdb
[8];
970 case PERSISTENT_RESERVE_OUT
:
971 if (su_dev
->t10_pr
.res_type
== SPC3_PERSISTENT_RESERVATIONS
)
972 cmd
->execute_cmd
= target_scsi3_emulate_pr_out
;
973 *size
= (cdb
[7] << 8) + cdb
[8];
977 if (cdb
[0] == RELEASE_10
)
978 *size
= (cdb
[7] << 8) | cdb
[8];
980 *size
= cmd
->data_length
;
982 if (su_dev
->t10_pr
.res_type
!= SPC_PASSTHROUGH
)
983 cmd
->execute_cmd
= target_scsi2_reservation_release
;
988 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
989 * Assume the passthrough or $FABRIC_MOD will tell us about it.
991 if (cdb
[0] == RESERVE_10
)
992 *size
= (cdb
[7] << 8) | cdb
[8];
994 *size
= cmd
->data_length
;
997 * Setup the legacy emulated handler for SPC-2 and
998 * >= SPC-3 compatible reservation handling (CRH=1)
999 * Otherwise, we assume the underlying SCSI logic is
1000 * is running in SPC_PASSTHROUGH, and wants reservations
1001 * emulation disabled.
1003 if (su_dev
->t10_pr
.res_type
!= SPC_PASSTHROUGH
)
1004 cmd
->execute_cmd
= target_scsi2_reservation_reserve
;
1008 cmd
->execute_cmd
= spc_emulate_request_sense
;
1011 *size
= (cdb
[3] << 8) + cdb
[4];
1014 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
1015 * See spc4r17 section 5.3
1017 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
1018 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
1019 cmd
->execute_cmd
= spc_emulate_inquiry
;
1021 case SECURITY_PROTOCOL_IN
:
1022 case SECURITY_PROTOCOL_OUT
:
1023 *size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
1026 case READ_ATTRIBUTE
:
1027 case RECEIVE_COPY_RESULTS
:
1028 case WRITE_ATTRIBUTE
:
1029 *size
= (cdb
[10] << 24) | (cdb
[11] << 16) |
1030 (cdb
[12] << 8) | cdb
[13];
1032 case RECEIVE_DIAGNOSTIC
:
1033 case SEND_DIAGNOSTIC
:
1034 *size
= (cdb
[3] << 8) | cdb
[4];
1037 *size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
1040 cmd
->execute_cmd
= target_report_luns
;
1041 *size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
1043 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
1044 * See spc4r17 section 5.3
1046 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
1047 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
1049 case TEST_UNIT_READY
:
1050 cmd
->execute_cmd
= spc_emulate_testunitready
;
1054 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
1055 " 0x%02x, sending CHECK_CONDITION.\n",
1056 cmd
->se_tfo
->get_fabric_name(), cdb
[0]);
1057 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1058 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
1064 EXPORT_SYMBOL(spc_parse_cdb
);