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->se_sub_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->se_sub_dev->t10_wwn.model);
105 snprintf(&buf[32], 4, "%s", dev->se_sub_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->se_sub_dev->su_dev_flags &
118 SDF_EMULATED_VPD_UNIT_SERIAL) {
121 unit_serial_len = strlen(dev->se_sub_dev->t10_wwn.unit_serial);
122 unit_serial_len++; /* For NULL Terminator */
124 len += sprintf(&buf[4], "%s",
125 dev->se_sub_dev->t10_wwn.unit_serial);
126 len++; /* Extra Byte for NULL Terminator */
132 static void spc_parse_naa_6h_vendor_specific(struct se_device *dev,
135 unsigned char *p = &dev->se_sub_dev->t10_wwn.unit_serial[0];
140 * Generate up to 36 bits of VENDOR SPECIFIC IDENTIFIER starting on
141 * byte 3 bit 3-0 for NAA IEEE Registered Extended DESIGNATOR field
142 * format, followed by 64 bits of VENDOR SPECIFIC IDENTIFIER EXTENSION
143 * to complete the payload. These are based from VPD=0x80 PRODUCT SERIAL
144 * NUMBER set via vpd_unit_serial in target_core_configfs.c to ensure
145 * per device uniqeness.
147 for (cnt = 0; *p && cnt < 13; p++) {
148 int val = hex_to_bin(*p);
164 * Device identification VPD, for a complete list of
165 * DESIGNATOR TYPEs see spc4r17 Table 459.
167 static int spc_emulate_evpd_83(struct se_cmd *cmd, unsigned char *buf)
169 struct se_device *dev = cmd->se_dev;
170 struct se_lun *lun = cmd->se_lun;
171 struct se_port *port = NULL;
172 struct se_portal_group *tpg = NULL;
173 struct t10_alua_lu_gp_member *lu_gp_mem;
174 struct t10_alua_tg_pt_gp *tg_pt_gp;
175 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
176 unsigned char *prod = &dev->se_sub_dev->t10_wwn.model[0];
178 u32 unit_serial_len, off = 0;
184 * NAA IEEE Registered Extended Assigned designator format, see
185 * spc4r17 section 7.7.3.6.5
187 * We depend upon a target_core_mod/ConfigFS provided
188 * /sys/kernel/config/target/core/$HBA/$DEV/wwn/vpd_unit_serial
189 * value in order to return the NAA id.
191 if (!(dev->se_sub_dev->su_dev_flags & SDF_EMULATED_VPD_UNIT_SERIAL))
192 goto check_t10_vend_desc;
194 /* CODE SET == Binary */
197 /* Set ASSOCIATION == addressed logical unit: 0)b */
200 /* Identifier/Designator type == NAA identifier */
204 /* Identifier/Designator length */
208 * Start NAA IEEE Registered Extended Identifier/Designator
210 buf[off++] = (0x6 << 4);
213 * Use OpenFabrics IEEE Company ID: 00 14 05
217 buf[off] = (0x5 << 4);
220 * Return ConfigFS Unit Serial Number information for
221 * VENDOR_SPECIFIC_IDENTIFIER and
222 * VENDOR_SPECIFIC_IDENTIFIER_EXTENTION
224 spc_parse_naa_6h_vendor_specific(dev, &buf[off]);
231 * T10 Vendor Identifier Page, see spc4r17 section 7.7.3.4
233 id_len = 8; /* For Vendor field */
234 prod_len = 4; /* For VPD Header */
235 prod_len += 8; /* For Vendor field */
236 prod_len += strlen(prod);
237 prod_len++; /* For : */
239 if (dev->se_sub_dev->su_dev_flags &
240 SDF_EMULATED_VPD_UNIT_SERIAL) {
242 strlen(&dev->se_sub_dev->t10_wwn.unit_serial[0]);
243 unit_serial_len++; /* For NULL Terminator */
245 id_len += sprintf(&buf[off+12], "%s:%s", prod,
246 &dev->se_sub_dev->t10_wwn.unit_serial[0]);
248 buf[off] = 0x2; /* ASCII */
249 buf[off+1] = 0x1; /* T10 Vendor ID */
251 memcpy(&buf[off+4], "LIO-ORG", 8);
252 /* Extra Byte for NULL Terminator */
254 /* Identifier Length */
256 /* Header size for Designation descriptor */
260 * struct se_port is only set for INQUIRY VPD=1 through $FABRIC_MOD
264 struct t10_alua_lu_gp *lu_gp;
265 u32 padding, scsi_name_len;
272 * Relative target port identifer, see spc4r17
275 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
276 * section 7.5.1 Table 362
279 (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
280 buf[off++] |= 0x1; /* CODE SET == Binary */
281 buf[off] = 0x80; /* Set PIV=1 */
282 /* Set ASSOCIATION == target port: 01b */
284 /* DESIGNATOR TYPE == Relative target port identifer */
286 off++; /* Skip over Reserved */
287 buf[off++] = 4; /* DESIGNATOR LENGTH */
288 /* Skip over Obsolete field in RTPI payload
291 buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
292 buf[off++] = (port->sep_rtpi & 0xff);
293 len += 8; /* Header size + Designation descriptor */
295 * Target port group identifier, see spc4r17
298 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
299 * section 7.5.1 Table 362
301 if (dev->se_sub_dev->t10_alua.alua_type !=
303 goto check_scsi_name;
305 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
309 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
310 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
312 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
315 tg_pt_gp_id = tg_pt_gp->tg_pt_gp_id;
316 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
319 (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
320 buf[off++] |= 0x1; /* CODE SET == Binary */
321 buf[off] = 0x80; /* Set PIV=1 */
322 /* Set ASSOCIATION == target port: 01b */
324 /* DESIGNATOR TYPE == Target port group identifier */
326 off++; /* Skip over Reserved */
327 buf[off++] = 4; /* DESIGNATOR LENGTH */
328 off += 2; /* Skip over Reserved Field */
329 buf[off++] = ((tg_pt_gp_id >> 8) & 0xff);
330 buf[off++] = (tg_pt_gp_id & 0xff);
331 len += 8; /* Header size + Designation descriptor */
333 * Logical Unit Group identifier, see spc4r17
337 lu_gp_mem = dev->dev_alua_lu_gp_mem;
339 goto check_scsi_name;
341 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
342 lu_gp = lu_gp_mem->lu_gp;
344 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
345 goto check_scsi_name;
347 lu_gp_id = lu_gp->lu_gp_id;
348 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
350 buf[off++] |= 0x1; /* CODE SET == Binary */
351 /* DESIGNATOR TYPE == Logical Unit Group identifier */
353 off++; /* Skip over Reserved */
354 buf[off++] = 4; /* DESIGNATOR LENGTH */
355 off += 2; /* Skip over Reserved Field */
356 buf[off++] = ((lu_gp_id >> 8) & 0xff);
357 buf[off++] = (lu_gp_id & 0xff);
358 len += 8; /* Header size + Designation descriptor */
360 * SCSI name string designator, see spc4r17
363 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
364 * section 7.5.1 Table 362
367 scsi_name_len = strlen(tpg->se_tpg_tfo->tpg_get_wwn(tpg));
368 /* UTF-8 ",t,0x<16-bit TPGT>" + NULL Terminator */
370 /* Check for 4-byte padding */
371 padding = ((-scsi_name_len) & 3);
373 scsi_name_len += padding;
374 /* Header size + Designation descriptor */
378 (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
379 buf[off++] |= 0x3; /* CODE SET == UTF-8 */
380 buf[off] = 0x80; /* Set PIV=1 */
381 /* Set ASSOCIATION == target port: 01b */
383 /* DESIGNATOR TYPE == SCSI name string */
385 off += 2; /* Skip over Reserved and length */
387 * SCSI name string identifer containing, $FABRIC_MOD
388 * dependent information. For LIO-Target and iSCSI
389 * Target Port, this means "<iSCSI name>,t,0x<TPGT> in
392 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
393 scsi_name_len = sprintf(&buf[off], "%s,t,0x%04x",
394 tpg->se_tpg_tfo->tpg_get_wwn(tpg), tpgt);
395 scsi_name_len += 1 /* Include NULL terminator */;
397 * The null-terminated, null-padded (see 4.4.2) SCSI
398 * NAME STRING field contains a UTF-8 format string.
399 * The number of bytes in the SCSI NAME STRING field
400 * (i.e., the value in the DESIGNATOR LENGTH field)
401 * shall be no larger than 256 and shall be a multiple
405 scsi_name_len += padding;
407 buf[off-1] = scsi_name_len;
408 off += scsi_name_len;
409 /* Header size + Designation descriptor */
410 len += (scsi_name_len + 4);
412 buf[2] = ((len >> 8) & 0xff);
413 buf[3] = (len & 0xff); /* Page Length for VPD 0x83 */
417 /* Extended INQUIRY Data VPD Page */
418 static int spc_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf)
421 /* Set HEADSUP, ORDSUP, SIMPSUP */
424 /* If WriteCache emulation is enabled, set V_SUP */
425 if (cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0)
430 /* Block Limits VPD page */
431 static int spc_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf)
433 struct se_device *dev = cmd->se_dev;
438 * Following spc3r22 section 6.5.3 Block Limits VPD page, when
439 * emulate_tpu=1 or emulate_tpws=1 we will be expect a
440 * different page length for Thin Provisioning.
442 if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws)
445 buf[0] = dev->transport->get_device_type(dev);
446 buf[3] = have_tp ? 0x3c : 0x10;
452 * Set OPTIMAL TRANSFER LENGTH GRANULARITY
454 put_unaligned_be16(1, &buf[6]);
457 * Set MAXIMUM TRANSFER LENGTH
459 max_sectors = min(dev->se_sub_dev->se_dev_attrib.fabric_max_sectors,
460 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
461 put_unaligned_be32(max_sectors, &buf[8]);
464 * Set OPTIMAL TRANSFER LENGTH
466 put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.optimal_sectors, &buf[12]);
469 * Exit now if we don't support TP.
475 * Set MAXIMUM UNMAP LBA COUNT
477 put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count, &buf[20]);
480 * Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT
482 put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count,
486 * Set OPTIMAL UNMAP GRANULARITY
488 put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.unmap_granularity, &buf[28]);
491 * UNMAP GRANULARITY ALIGNMENT
493 put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment,
495 if (dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment != 0)
496 buf[32] |= 0x80; /* Set the UGAVALID bit */
501 /* Block Device Characteristics VPD page */
502 static int spc_emulate_evpd_b1(struct se_cmd *cmd, unsigned char *buf)
504 struct se_device *dev = cmd->se_dev;
506 buf[0] = dev->transport->get_device_type(dev);
508 buf[5] = dev->se_sub_dev->se_dev_attrib.is_nonrot ? 1 : 0;
513 /* Thin Provisioning VPD */
514 static int spc_emulate_evpd_b2(struct se_cmd *cmd, unsigned char *buf)
516 struct se_device *dev = cmd->se_dev;
519 * From spc3r22 section 6.5.4 Thin Provisioning VPD page:
521 * The PAGE LENGTH field is defined in SPC-4. If the DP bit is set to
522 * zero, then the page length shall be set to 0004h. If the DP bit
523 * is set to one, then the page length shall be set to the value
524 * defined in table 162.
526 buf[0] = dev->transport->get_device_type(dev);
529 * Set Hardcoded length mentioned above for DP=0
531 put_unaligned_be16(0x0004, &buf[2]);
534 * The THRESHOLD EXPONENT field indicates the threshold set size in
535 * LBAs as a power of 2 (i.e., the threshold set size is equal to
536 * 2(threshold exponent)).
538 * Note that this is currently set to 0x00 as mkp says it will be
539 * changing again. We can enable this once it has settled in T10
540 * and is actually used by Linux/SCSI ML code.
545 * A TPU bit set to one indicates that the device server supports
546 * the UNMAP command (see 5.25). A TPU bit set to zero indicates
547 * that the device server does not support the UNMAP command.
549 if (dev->se_sub_dev->se_dev_attrib.emulate_tpu != 0)
553 * A TPWS bit set to one indicates that the device server supports
554 * the use of the WRITE SAME (16) command (see 5.42) to unmap LBAs.
555 * A TPWS bit set to zero indicates that the device server does not
556 * support the use of the WRITE SAME (16) command to unmap LBAs.
558 if (dev->se_sub_dev->se_dev_attrib.emulate_tpws != 0)
564 static int spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf);
568 int (*emulate)(struct se_cmd *, unsigned char *);
569 } evpd_handlers[] = {
570 { .page = 0x00, .emulate = spc_emulate_evpd_00 },
571 { .page = 0x80, .emulate = spc_emulate_evpd_80 },
572 { .page = 0x83, .emulate = spc_emulate_evpd_83 },
573 { .page = 0x86, .emulate = spc_emulate_evpd_86 },
574 { .page = 0xb0, .emulate = spc_emulate_evpd_b0 },
575 { .page = 0xb1, .emulate = spc_emulate_evpd_b1 },
576 { .page = 0xb2, .emulate = spc_emulate_evpd_b2 },
579 /* supported vital product data pages */
580 static int spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf)
585 * Only report the INQUIRY EVPD=1 pages after a valid NAA
586 * Registered Extended LUN WWN has been set via ConfigFS
587 * during device creation/restart.
589 if (cmd->se_dev->se_sub_dev->su_dev_flags &
590 SDF_EMULATED_VPD_UNIT_SERIAL) {
591 buf[3] = ARRAY_SIZE(evpd_handlers);
592 for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p)
593 buf[p + 4] = evpd_handlers[p].page;
599 static int spc_emulate_inquiry(struct se_cmd *cmd)
601 struct se_device *dev = cmd->se_dev;
602 struct se_portal_group *tpg = cmd->se_lun->lun_sep->sep_tpg;
604 unsigned char *cdb = cmd->t_task_cdb;
605 unsigned char buf[SE_INQUIRY_BUF];
608 if (dev == tpg->tpg_virt_lun0.lun_se_dev)
609 buf[0] = 0x3f; /* Not connected */
611 buf[0] = dev->transport->get_device_type(dev);
613 if (!(cdb[1] & 0x1)) {
615 pr_err("INQUIRY with EVPD==0 but PAGE CODE=%02x\n",
617 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
622 ret = spc_emulate_inquiry_std(cmd, buf);
626 for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p) {
627 if (cdb[2] == evpd_handlers[p].page) {
629 ret = evpd_handlers[p].emulate(cmd, buf);
634 pr_err("Unknown VPD Code: 0x%02x\n", cdb[2]);
635 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
639 rbuf = transport_kmap_data_sg(cmd);
641 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
642 transport_kunmap_data_sg(cmd);
646 target_complete_cmd(cmd, GOOD);
650 static int spc_modesense_rwrecovery(unsigned char *p)
658 static int spc_modesense_control(struct se_device *dev, unsigned char *p)
664 * From spc4r23, 7.4.7 Control mode page
666 * The QUEUE ALGORITHM MODIFIER field (see table 368) specifies
667 * restrictions on the algorithm used for reordering commands
668 * having the SIMPLE task attribute (see SAM-4).
670 * Table 368 -- QUEUE ALGORITHM MODIFIER field
672 * 0h Restricted reordering
673 * 1h Unrestricted reordering allowed
675 * 8h to Fh Vendor specific
677 * A value of zero in the QUEUE ALGORITHM MODIFIER field specifies that
678 * the device server shall order the processing sequence of commands
679 * having the SIMPLE task attribute such that data integrity is maintained
680 * for that I_T nexus (i.e., if the transmission of new SCSI transport protocol
681 * requests is halted at any time, the final value of all data observable
682 * on the medium shall be the same as if all the commands had been processed
683 * with the ORDERED task attribute).
685 * A value of one in the QUEUE ALGORITHM MODIFIER field specifies that the
686 * device server may reorder the processing sequence of commands having the
687 * SIMPLE task attribute in any manner. Any data integrity exposures related to
688 * command sequence order shall be explicitly handled by the application client
689 * through the selection of appropriate ommands and task attributes.
691 p[3] = (dev->se_sub_dev->se_dev_attrib.emulate_rest_reord == 1) ? 0x00 : 0x10;
693 * From spc4r17, section 7.4.6 Control mode Page
695 * Unit Attention interlocks control (UN_INTLCK_CTRL) to code 00b
697 * 00b: The logical unit shall clear any unit attention condition
698 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
699 * status and shall not establish a unit attention condition when a com-
700 * mand is completed with BUSY, TASK SET FULL, or RESERVATION CONFLICT
703 * 10b: The logical unit shall not clear any unit attention condition
704 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
705 * status and shall not establish a unit attention condition when
706 * a command is completed with BUSY, TASK SET FULL, or RESERVATION
709 * 11b a The logical unit shall not clear any unit attention condition
710 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
711 * status and shall establish a unit attention condition for the
712 * initiator port associated with the I_T nexus on which the BUSY,
713 * TASK SET FULL, or RESERVATION CONFLICT status is being returned.
714 * Depending on the status, the additional sense code shall be set to
715 * PREVIOUS BUSY STATUS, PREVIOUS TASK SET FULL STATUS, or PREVIOUS
716 * RESERVATION CONFLICT STATUS. Until it is cleared by a REQUEST SENSE
717 * command, a unit attention condition shall be established only once
718 * for a BUSY, TASK SET FULL, or RESERVATION CONFLICT status regardless
719 * to the number of commands completed with one of those status codes.
721 p[4] = (dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2) ? 0x30 :
722 (dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 1) ? 0x20 : 0x00;
724 * From spc4r17, section 7.4.6 Control mode Page
726 * Task Aborted Status (TAS) bit set to zero.
728 * A task aborted status (TAS) bit set to zero specifies that aborted
729 * tasks shall be terminated by the device server without any response
730 * to the application client. A TAS bit set to one specifies that tasks
731 * aborted by the actions of an I_T nexus other than the I_T nexus on
732 * which the command was received shall be completed with TASK ABORTED
733 * status (see SAM-4).
735 p[5] = (dev->se_sub_dev->se_dev_attrib.emulate_tas) ? 0x40 : 0x00;
743 static int spc_modesense_caching(struct se_device *dev, unsigned char *p)
747 if (dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0)
748 p[2] = 0x04; /* Write Cache Enable */
749 p[12] = 0x20; /* Disabled Read Ahead */
754 static void spc_modesense_write_protect(unsigned char *buf, int type)
757 * I believe that the WP bit (bit 7) in the mode header is the same for
764 buf[0] |= 0x80; /* WP bit */
769 static void spc_modesense_dpofua(unsigned char *buf, int type)
773 buf[0] |= 0x10; /* DPOFUA bit */
780 static int spc_emulate_modesense(struct se_cmd *cmd)
782 struct se_device *dev = cmd->se_dev;
783 char *cdb = cmd->t_task_cdb;
785 int type = dev->transport->get_device_type(dev);
786 int ten = (cmd->t_task_cdb[0] == MODE_SENSE_10);
787 u32 offset = ten ? 8 : 4;
789 unsigned char buf[SE_MODE_PAGE_BUF];
791 memset(buf, 0, SE_MODE_PAGE_BUF);
793 switch (cdb[2] & 0x3f) {
795 length = spc_modesense_rwrecovery(&buf[offset]);
798 length = spc_modesense_caching(dev, &buf[offset]);
801 length = spc_modesense_control(dev, &buf[offset]);
804 length = spc_modesense_rwrecovery(&buf[offset]);
805 length += spc_modesense_caching(dev, &buf[offset+length]);
806 length += spc_modesense_control(dev, &buf[offset+length]);
809 pr_err("MODE SENSE: unimplemented page/subpage: 0x%02x/0x%02x\n",
810 cdb[2] & 0x3f, cdb[3]);
811 cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
818 buf[0] = (offset >> 8) & 0xff;
819 buf[1] = offset & 0xff;
822 if ((cmd->se_lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) ||
824 (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)))
825 spc_modesense_write_protect(&buf[3], type);
827 if ((dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0) &&
828 (dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0))
829 spc_modesense_dpofua(&buf[3], type);
832 buf[0] = offset & 0xff;
835 if ((cmd->se_lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) ||
837 (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)))
838 spc_modesense_write_protect(&buf[2], type);
840 if ((dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0) &&
841 (dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0))
842 spc_modesense_dpofua(&buf[2], type);
845 rbuf = transport_kmap_data_sg(cmd);
847 memcpy(rbuf, buf, min(offset, cmd->data_length));
848 transport_kunmap_data_sg(cmd);
851 target_complete_cmd(cmd, GOOD);
855 static int spc_emulate_request_sense(struct se_cmd *cmd)
857 unsigned char *cdb = cmd->t_task_cdb;
859 u8 ua_asc = 0, ua_ascq = 0;
860 unsigned char buf[SE_SENSE_BUF];
862 memset(buf, 0, SE_SENSE_BUF);
865 pr_err("REQUEST_SENSE description emulation not"
867 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
871 rbuf = transport_kmap_data_sg(cmd);
872 if (cmd->scsi_sense_reason != 0) {
874 * Out of memory. We will fail with CHECK CONDITION, so
875 * we must not clear the unit attention condition.
877 target_complete_cmd(cmd, CHECK_CONDITION);
879 } else if (!core_scsi3_ua_clear_for_request_sense(cmd, &ua_asc, &ua_ascq)) {
881 * CURRENT ERROR, UNIT ATTENTION
884 buf[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
887 * The Additional Sense Code (ASC) from the UNIT ATTENTION
889 buf[SPC_ASC_KEY_OFFSET] = ua_asc;
890 buf[SPC_ASCQ_KEY_OFFSET] = ua_ascq;
894 * CURRENT ERROR, NO SENSE
897 buf[SPC_SENSE_KEY_OFFSET] = NO_SENSE;
900 * NO ADDITIONAL SENSE INFORMATION
902 buf[SPC_ASC_KEY_OFFSET] = 0x00;
907 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
908 transport_kunmap_data_sg(cmd);
911 target_complete_cmd(cmd, GOOD);
915 static int spc_emulate_testunitready(struct se_cmd *cmd)
917 target_complete_cmd(cmd, GOOD);
921 int spc_parse_cdb(struct se_cmd *cmd, unsigned int *size)
923 struct se_device *dev = cmd->se_dev;
924 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
925 unsigned char *cdb = cmd->t_task_cdb;
932 *size = (cdb[7] << 8) + cdb[8];
936 cmd->execute_cmd = spc_emulate_modesense;
939 *size = (cdb[7] << 8) + cdb[8];
940 cmd->execute_cmd = spc_emulate_modesense;
944 *size = (cdb[7] << 8) + cdb[8];
946 case PERSISTENT_RESERVE_IN:
947 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
948 cmd->execute_cmd = target_scsi3_emulate_pr_in;
949 *size = (cdb[7] << 8) + cdb[8];
951 case PERSISTENT_RESERVE_OUT:
952 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
953 cmd->execute_cmd = target_scsi3_emulate_pr_out;
954 *size = (cdb[7] << 8) + cdb[8];
958 if (cdb[0] == RELEASE_10)
959 *size = (cdb[7] << 8) | cdb[8];
961 *size = cmd->data_length;
963 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
964 cmd->execute_cmd = target_scsi2_reservation_release;
969 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
970 * Assume the passthrough or $FABRIC_MOD will tell us about it.
972 if (cdb[0] == RESERVE_10)
973 *size = (cdb[7] << 8) | cdb[8];
975 *size = cmd->data_length;
978 * Setup the legacy emulated handler for SPC-2 and
979 * >= SPC-3 compatible reservation handling (CRH=1)
980 * Otherwise, we assume the underlying SCSI logic is
981 * is running in SPC_PASSTHROUGH, and wants reservations
982 * emulation disabled.
984 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
985 cmd->execute_cmd = target_scsi2_reservation_reserve;
989 cmd->execute_cmd = spc_emulate_request_sense;
992 *size = (cdb[3] << 8) + cdb[4];
995 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
996 * See spc4r17 section 5.3
998 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
999 cmd->sam_task_attr = MSG_HEAD_TAG;
1000 cmd->execute_cmd = spc_emulate_inquiry;
1002 case SECURITY_PROTOCOL_IN:
1003 case SECURITY_PROTOCOL_OUT:
1004 *size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
1007 case READ_ATTRIBUTE:
1008 case RECEIVE_COPY_RESULTS:
1009 case WRITE_ATTRIBUTE:
1010 *size = (cdb[10] << 24) | (cdb[11] << 16) |
1011 (cdb[12] << 8) | cdb[13];
1013 case RECEIVE_DIAGNOSTIC:
1014 case SEND_DIAGNOSTIC:
1015 *size = (cdb[3] << 8) | cdb[4];
1018 *size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
1021 cmd->execute_cmd = target_report_luns;
1022 *size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
1024 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
1025 * See spc4r17 section 5.3
1027 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1028 cmd->sam_task_attr = MSG_HEAD_TAG;
1030 case TEST_UNIT_READY:
1031 cmd->execute_cmd = spc_emulate_testunitready;
1034 case MAINTENANCE_IN:
1035 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
1037 * MAINTENANCE_IN from SCC-2
1038 * Check for emulated MI_REPORT_TARGET_PGS
1040 if ((cdb[1] & 0x1f) == MI_REPORT_TARGET_PGS &&
1041 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
1043 target_emulate_report_target_port_groups;
1045 *size = get_unaligned_be32(&cdb[6]);
1048 * GPCMD_SEND_KEY from multi media commands
1050 *size = get_unaligned_be16(&cdb[8]);
1053 case MAINTENANCE_OUT:
1054 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
1056 * MAINTENANCE_OUT from SCC-2
1057 * Check for emulated MO_SET_TARGET_PGS.
1059 if (cdb[1] == MO_SET_TARGET_PGS &&
1060 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
1062 target_emulate_set_target_port_groups;
1064 *size = get_unaligned_be32(&cdb[6]);
1067 * GPCMD_SEND_KEY from multi media commands
1069 *size = get_unaligned_be16(&cdb[8]);
1073 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
1074 " 0x%02x, sending CHECK_CONDITION.\n",
1075 cmd->se_tfo->get_fabric_name(), cdb[0]);
1076 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1077 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1083 EXPORT_SYMBOL(spc_parse_cdb);