1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * SCSI Primary Commands (SPC) parsing and emulation.
5 * (c) Copyright 2002-2013 Datera, Inc.
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <asm/unaligned.h>
14 #include <scsi/scsi_proto.h>
15 #include <scsi/scsi_common.h>
16 #include <scsi/scsi_tcq.h>
18 #include <target/target_core_base.h>
19 #include <target/target_core_backend.h>
20 #include <target/target_core_fabric.h>
22 #include "target_core_internal.h"
23 #include "target_core_alua.h"
24 #include "target_core_pr.h"
25 #include "target_core_ua.h"
26 #include "target_core_xcopy.h"
28 static void spc_fill_alua_data(struct se_lun *lun, unsigned char *buf)
30 struct t10_alua_tg_pt_gp *tg_pt_gp;
33 * Set SCCS for MAINTENANCE_IN + REPORT_TARGET_PORT_GROUPS.
38 * Set TPGS field for explicit and/or implicit ALUA access type
41 * See spc4r17 section 6.4.2 Table 135
44 tg_pt_gp = rcu_dereference(lun->lun_tg_pt_gp);
46 buf[5] |= tg_pt_gp->tg_pt_gp_alua_access_type;
51 spc_find_scsi_transport_vd(int proto_id)
54 case SCSI_PROTOCOL_FCP:
55 return SCSI_VERSION_DESCRIPTOR_FCP4;
56 case SCSI_PROTOCOL_ISCSI:
57 return SCSI_VERSION_DESCRIPTOR_ISCSI;
58 case SCSI_PROTOCOL_SAS:
59 return SCSI_VERSION_DESCRIPTOR_SAS3;
60 case SCSI_PROTOCOL_SBP:
61 return SCSI_VERSION_DESCRIPTOR_SBP3;
62 case SCSI_PROTOCOL_SRP:
63 return SCSI_VERSION_DESCRIPTOR_SRP;
65 pr_warn("Cannot find VERSION DESCRIPTOR value for unknown SCSI"
66 " transport PROTOCOL IDENTIFIER %#x\n", proto_id);
72 spc_emulate_inquiry_std(struct se_cmd *cmd, unsigned char *buf)
74 struct se_lun *lun = cmd->se_lun;
75 struct se_portal_group *tpg = lun->lun_tpg;
76 struct se_device *dev = cmd->se_dev;
77 struct se_session *sess = cmd->se_sess;
79 /* Set RMB (removable media) for tape devices */
80 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
83 buf[2] = 0x06; /* SPC-4 */
86 * NORMACA and HISUP = 0, RESPONSE DATA FORMAT = 2
89 * A RESPONSE DATA FORMAT field set to 2h indicates that the
90 * standard INQUIRY data is in the format defined in this
91 * standard. Response data format values less than 2h are
92 * obsolete. Response data format values greater than 2h are
98 * Enable SCCS and TPGS fields for Emulated ALUA
100 spc_fill_alua_data(lun, buf);
103 * Set Third-Party Copy (3PC) bit to indicate support for EXTENDED_COPY
105 if (dev->dev_attrib.emulate_3pc)
108 * Set Protection (PROTECT) bit when DIF has been enabled on the
109 * device, and the fabric supports VERIFY + PASS. Also report
110 * PROTECT=1 if sess_prot_type has been configured to allow T10-PI
111 * to unprotected devices.
113 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
114 if (dev->dev_attrib.pi_prot_type || cmd->se_sess->sess_prot_type)
119 * Set MULTIP bit to indicate presence of multiple SCSI target ports
121 if (dev->export_count > 1)
124 buf[7] = 0x2; /* CmdQue=1 */
127 * ASCII data fields described as being left-aligned shall have any
128 * unused bytes at the end of the field (i.e., highest offset) and the
129 * unused bytes shall be filled with ASCII space characters (20h).
131 memset(&buf[8], 0x20,
132 INQUIRY_VENDOR_LEN + INQUIRY_MODEL_LEN + INQUIRY_REVISION_LEN);
133 memcpy(&buf[8], dev->t10_wwn.vendor,
134 strnlen(dev->t10_wwn.vendor, INQUIRY_VENDOR_LEN));
135 memcpy(&buf[16], dev->t10_wwn.model,
136 strnlen(dev->t10_wwn.model, INQUIRY_MODEL_LEN));
137 memcpy(&buf[32], dev->t10_wwn.revision,
138 strnlen(dev->t10_wwn.revision, INQUIRY_REVISION_LEN));
141 * Set the VERSION DESCRIPTOR fields
143 put_unaligned_be16(SCSI_VERSION_DESCRIPTOR_SAM5, &buf[58]);
144 put_unaligned_be16(spc_find_scsi_transport_vd(tpg->proto_id), &buf[60]);
145 put_unaligned_be16(SCSI_VERSION_DESCRIPTOR_SPC4, &buf[62]);
146 if (cmd->se_dev->transport->get_device_type(dev) == TYPE_DISK)
147 put_unaligned_be16(SCSI_VERSION_DESCRIPTOR_SBC3, &buf[64]);
149 buf[4] = 91; /* Set additional length to 91 */
153 EXPORT_SYMBOL(spc_emulate_inquiry_std);
155 /* unit serial number */
156 static sense_reason_t
157 spc_emulate_evpd_80(struct se_cmd *cmd, unsigned char *buf)
159 struct se_device *dev = cmd->se_dev;
162 if (dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) {
163 len = sprintf(&buf[4], "%s", dev->t10_wwn.unit_serial);
164 len++; /* Extra Byte for NULL Terminator */
171 * Generate NAA IEEE Registered Extended designator
173 void spc_gen_naa_6h_vendor_specific(struct se_device *dev,
176 unsigned char *p = &dev->t10_wwn.unit_serial[0];
177 u32 company_id = dev->t10_wwn.company_id;
182 * Start NAA IEEE Registered Extended Identifier/Designator
186 /* IEEE COMPANY_ID */
187 buf[off++] |= (company_id >> 20) & 0xf;
188 buf[off++] = (company_id >> 12) & 0xff;
189 buf[off++] = (company_id >> 4) & 0xff;
190 buf[off] = (company_id & 0xf) << 4;
193 * Generate up to 36 bits of VENDOR SPECIFIC IDENTIFIER starting on
194 * byte 3 bit 3-0 for NAA IEEE Registered Extended DESIGNATOR field
195 * format, followed by 64 bits of VENDOR SPECIFIC IDENTIFIER EXTENSION
196 * to complete the payload. These are based from VPD=0x80 PRODUCT SERIAL
197 * NUMBER set via vpd_unit_serial in target_core_configfs.c to ensure
198 * per device uniqeness.
200 for (cnt = off + 13; *p && off < cnt; p++) {
201 int val = hex_to_bin(*p);
217 * Device identification VPD, for a complete list of
218 * DESIGNATOR TYPEs see spc4r17 Table 459.
221 spc_emulate_evpd_83(struct se_cmd *cmd, unsigned char *buf)
223 struct se_device *dev = cmd->se_dev;
224 struct se_lun *lun = cmd->se_lun;
225 struct se_portal_group *tpg = NULL;
226 struct t10_alua_lu_gp_member *lu_gp_mem;
227 struct t10_alua_tg_pt_gp *tg_pt_gp;
228 unsigned char *prod = &dev->t10_wwn.model[0];
230 u32 unit_serial_len, off = 0;
236 * NAA IEEE Registered Extended Assigned designator format, see
237 * spc4r17 section 7.7.3.6.5
239 * We depend upon a target_core_mod/ConfigFS provided
240 * /sys/kernel/config/target/core/$HBA/$DEV/wwn/vpd_unit_serial
241 * value in order to return the NAA id.
243 if (!(dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL))
244 goto check_t10_vend_desc;
246 /* CODE SET == Binary */
249 /* Set ASSOCIATION == addressed logical unit: 0)b */
252 /* Identifier/Designator type == NAA identifier */
256 /* Identifier/Designator length */
259 /* NAA IEEE Registered Extended designator */
260 spc_gen_naa_6h_vendor_specific(dev, &buf[off]);
267 * T10 Vendor Identifier Page, see spc4r17 section 7.7.3.4
269 id_len = 8; /* For Vendor field */
270 prod_len = 4; /* For VPD Header */
271 prod_len += 8; /* For Vendor field */
272 prod_len += strlen(prod);
273 prod_len++; /* For : */
275 if (dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) {
276 unit_serial_len = strlen(&dev->t10_wwn.unit_serial[0]);
277 unit_serial_len++; /* For NULL Terminator */
279 id_len += sprintf(&buf[off+12], "%s:%s", prod,
280 &dev->t10_wwn.unit_serial[0]);
282 buf[off] = 0x2; /* ASCII */
283 buf[off+1] = 0x1; /* T10 Vendor ID */
285 /* left align Vendor ID and pad with spaces */
286 memset(&buf[off+4], 0x20, INQUIRY_VENDOR_LEN);
287 memcpy(&buf[off+4], dev->t10_wwn.vendor,
288 strnlen(dev->t10_wwn.vendor, INQUIRY_VENDOR_LEN));
289 /* Extra Byte for NULL Terminator */
291 /* Identifier Length */
293 /* Header size for Designation descriptor */
298 struct t10_alua_lu_gp *lu_gp;
299 u32 padding, scsi_name_len, scsi_target_len;
306 * Relative target port identifer, see spc4r17
309 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
310 * section 7.5.1 Table 362
312 buf[off] = tpg->proto_id << 4;
313 buf[off++] |= 0x1; /* CODE SET == Binary */
314 buf[off] = 0x80; /* Set PIV=1 */
315 /* Set ASSOCIATION == target port: 01b */
317 /* DESIGNATOR TYPE == Relative target port identifer */
319 off++; /* Skip over Reserved */
320 buf[off++] = 4; /* DESIGNATOR LENGTH */
321 /* Skip over Obsolete field in RTPI payload
324 put_unaligned_be16(lun->lun_rtpi, &buf[off]);
326 len += 8; /* Header size + Designation descriptor */
328 * Target port group identifier, see spc4r17
331 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
332 * section 7.5.1 Table 362
335 tg_pt_gp = rcu_dereference(lun->lun_tg_pt_gp);
340 tg_pt_gp_id = tg_pt_gp->tg_pt_gp_id;
343 buf[off] = tpg->proto_id << 4;
344 buf[off++] |= 0x1; /* CODE SET == Binary */
345 buf[off] = 0x80; /* Set PIV=1 */
346 /* Set ASSOCIATION == target port: 01b */
348 /* DESIGNATOR TYPE == Target port group identifier */
350 off++; /* Skip over Reserved */
351 buf[off++] = 4; /* DESIGNATOR LENGTH */
352 off += 2; /* Skip over Reserved Field */
353 put_unaligned_be16(tg_pt_gp_id, &buf[off]);
355 len += 8; /* Header size + Designation descriptor */
357 * Logical Unit Group identifier, see spc4r17
361 lu_gp_mem = dev->dev_alua_lu_gp_mem;
363 goto check_scsi_name;
365 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
366 lu_gp = lu_gp_mem->lu_gp;
368 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
369 goto check_scsi_name;
371 lu_gp_id = lu_gp->lu_gp_id;
372 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
374 buf[off++] |= 0x1; /* CODE SET == Binary */
375 /* DESIGNATOR TYPE == Logical Unit Group identifier */
377 off++; /* Skip over Reserved */
378 buf[off++] = 4; /* DESIGNATOR LENGTH */
379 off += 2; /* Skip over Reserved Field */
380 put_unaligned_be16(lu_gp_id, &buf[off]);
382 len += 8; /* Header size + Designation descriptor */
384 * SCSI name string designator, see spc4r17
387 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
388 * section 7.5.1 Table 362
391 buf[off] = tpg->proto_id << 4;
392 buf[off++] |= 0x3; /* CODE SET == UTF-8 */
393 buf[off] = 0x80; /* Set PIV=1 */
394 /* Set ASSOCIATION == target port: 01b */
396 /* DESIGNATOR TYPE == SCSI name string */
398 off += 2; /* Skip over Reserved and length */
400 * SCSI name string identifer containing, $FABRIC_MOD
401 * dependent information. For LIO-Target and iSCSI
402 * Target Port, this means "<iSCSI name>,t,0x<TPGT> in
405 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
406 scsi_name_len = sprintf(&buf[off], "%s,t,0x%04x",
407 tpg->se_tpg_tfo->tpg_get_wwn(tpg), tpgt);
408 scsi_name_len += 1 /* Include NULL terminator */;
410 * The null-terminated, null-padded (see 4.4.2) SCSI
411 * NAME STRING field contains a UTF-8 format string.
412 * The number of bytes in the SCSI NAME STRING field
413 * (i.e., the value in the DESIGNATOR LENGTH field)
414 * shall be no larger than 256 and shall be a multiple
417 padding = ((-scsi_name_len) & 3);
419 scsi_name_len += padding;
420 if (scsi_name_len > 256)
423 buf[off-1] = scsi_name_len;
424 off += scsi_name_len;
425 /* Header size + Designation descriptor */
426 len += (scsi_name_len + 4);
429 * Target device designator
431 buf[off] = tpg->proto_id << 4;
432 buf[off++] |= 0x3; /* CODE SET == UTF-8 */
433 buf[off] = 0x80; /* Set PIV=1 */
434 /* Set ASSOCIATION == target device: 10b */
436 /* DESIGNATOR TYPE == SCSI name string */
438 off += 2; /* Skip over Reserved and length */
440 * SCSI name string identifer containing, $FABRIC_MOD
441 * dependent information. For LIO-Target and iSCSI
442 * Target Port, this means "<iSCSI name>" in
445 scsi_target_len = sprintf(&buf[off], "%s",
446 tpg->se_tpg_tfo->tpg_get_wwn(tpg));
447 scsi_target_len += 1 /* Include NULL terminator */;
449 * The null-terminated, null-padded (see 4.4.2) SCSI
450 * NAME STRING field contains a UTF-8 format string.
451 * The number of bytes in the SCSI NAME STRING field
452 * (i.e., the value in the DESIGNATOR LENGTH field)
453 * shall be no larger than 256 and shall be a multiple
456 padding = ((-scsi_target_len) & 3);
458 scsi_target_len += padding;
459 if (scsi_target_len > 256)
460 scsi_target_len = 256;
462 buf[off-1] = scsi_target_len;
463 off += scsi_target_len;
465 /* Header size + Designation descriptor */
466 len += (scsi_target_len + 4);
468 put_unaligned_be16(len, &buf[2]); /* Page Length for VPD 0x83 */
471 EXPORT_SYMBOL(spc_emulate_evpd_83);
473 /* Extended INQUIRY Data VPD Page */
474 static sense_reason_t
475 spc_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf)
477 struct se_device *dev = cmd->se_dev;
478 struct se_session *sess = cmd->se_sess;
482 * Set GRD_CHK + REF_CHK for TYPE1 protection, or GRD_CHK
483 * only for TYPE3 protection.
485 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
486 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT ||
487 cmd->se_sess->sess_prot_type == TARGET_DIF_TYPE1_PROT)
489 else if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE3_PROT ||
490 cmd->se_sess->sess_prot_type == TARGET_DIF_TYPE3_PROT)
494 /* logical unit supports type 1 and type 3 protection */
495 if ((dev->transport->get_device_type(dev) == TYPE_DISK) &&
496 (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) &&
497 (dev->dev_attrib.pi_prot_type || cmd->se_sess->sess_prot_type)) {
498 buf[4] |= (0x3 << 3);
501 /* Set HEADSUP, ORDSUP, SIMPSUP */
504 /* If WriteCache emulation is enabled, set V_SUP */
505 if (target_check_wce(dev))
507 /* If an LBA map is present set R_SUP */
508 spin_lock(&cmd->se_dev->t10_alua.lba_map_lock);
509 if (!list_empty(&dev->t10_alua.lba_map_list))
511 spin_unlock(&cmd->se_dev->t10_alua.lba_map_lock);
515 /* Block Limits VPD page */
516 static sense_reason_t
517 spc_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf)
519 struct se_device *dev = cmd->se_dev;
521 int have_tp = 0, opt, min;
524 * Following spc3r22 section 6.5.3 Block Limits VPD page, when
525 * emulate_tpu=1 or emulate_tpws=1 we will be expect a
526 * different page length for Thin Provisioning.
528 if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws)
531 buf[0] = dev->transport->get_device_type(dev);
532 buf[3] = have_tp ? 0x3c : 0x10;
537 * Set MAXIMUM COMPARE AND WRITE LENGTH
539 if (dev->dev_attrib.emulate_caw)
543 * Set OPTIMAL TRANSFER LENGTH GRANULARITY
545 if (dev->transport->get_io_min && (min = dev->transport->get_io_min(dev)))
546 put_unaligned_be16(min / dev->dev_attrib.block_size, &buf[6]);
548 put_unaligned_be16(1, &buf[6]);
551 * Set MAXIMUM TRANSFER LENGTH
553 * XXX: Currently assumes single PAGE_SIZE per scatterlist for fabrics
554 * enforcing maximum HW scatter-gather-list entry limit
556 if (cmd->se_tfo->max_data_sg_nents) {
557 mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE) /
558 dev->dev_attrib.block_size;
560 put_unaligned_be32(min_not_zero(mtl, dev->dev_attrib.hw_max_sectors), &buf[8]);
563 * Set OPTIMAL TRANSFER LENGTH
565 if (dev->transport->get_io_opt && (opt = dev->transport->get_io_opt(dev)))
566 put_unaligned_be32(opt / dev->dev_attrib.block_size, &buf[12]);
568 put_unaligned_be32(dev->dev_attrib.optimal_sectors, &buf[12]);
571 * Exit now if we don't support TP.
577 * Set MAXIMUM UNMAP LBA COUNT
579 put_unaligned_be32(dev->dev_attrib.max_unmap_lba_count, &buf[20]);
582 * Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT
584 put_unaligned_be32(dev->dev_attrib.max_unmap_block_desc_count,
588 * Set OPTIMAL UNMAP GRANULARITY
590 put_unaligned_be32(dev->dev_attrib.unmap_granularity, &buf[28]);
593 * UNMAP GRANULARITY ALIGNMENT
595 put_unaligned_be32(dev->dev_attrib.unmap_granularity_alignment,
597 if (dev->dev_attrib.unmap_granularity_alignment != 0)
598 buf[32] |= 0x80; /* Set the UGAVALID bit */
601 * MAXIMUM WRITE SAME LENGTH
604 put_unaligned_be64(dev->dev_attrib.max_write_same_len, &buf[36]);
609 /* Block Device Characteristics VPD page */
610 static sense_reason_t
611 spc_emulate_evpd_b1(struct se_cmd *cmd, unsigned char *buf)
613 struct se_device *dev = cmd->se_dev;
615 buf[0] = dev->transport->get_device_type(dev);
617 buf[5] = dev->dev_attrib.is_nonrot ? 1 : 0;
622 /* Thin Provisioning VPD */
623 static sense_reason_t
624 spc_emulate_evpd_b2(struct se_cmd *cmd, unsigned char *buf)
626 struct se_device *dev = cmd->se_dev;
629 * From spc3r22 section 6.5.4 Thin Provisioning VPD page:
631 * The PAGE LENGTH field is defined in SPC-4. If the DP bit is set to
632 * zero, then the page length shall be set to 0004h. If the DP bit
633 * is set to one, then the page length shall be set to the value
634 * defined in table 162.
636 buf[0] = dev->transport->get_device_type(dev);
639 * Set Hardcoded length mentioned above for DP=0
641 put_unaligned_be16(0x0004, &buf[2]);
644 * The THRESHOLD EXPONENT field indicates the threshold set size in
645 * LBAs as a power of 2 (i.e., the threshold set size is equal to
646 * 2(threshold exponent)).
648 * Note that this is currently set to 0x00 as mkp says it will be
649 * changing again. We can enable this once it has settled in T10
650 * and is actually used by Linux/SCSI ML code.
655 * A TPU bit set to one indicates that the device server supports
656 * the UNMAP command (see 5.25). A TPU bit set to zero indicates
657 * that the device server does not support the UNMAP command.
659 if (dev->dev_attrib.emulate_tpu != 0)
663 * A TPWS bit set to one indicates that the device server supports
664 * the use of the WRITE SAME (16) command (see 5.42) to unmap LBAs.
665 * A TPWS bit set to zero indicates that the device server does not
666 * support the use of the WRITE SAME (16) command to unmap LBAs.
668 if (dev->dev_attrib.emulate_tpws != 0)
669 buf[5] |= 0x40 | 0x20;
672 * The unmap_zeroes_data set means that the underlying device supports
673 * REQ_OP_DISCARD and has the discard_zeroes_data bit set. This
674 * satisfies the SBC requirements for LBPRZ, meaning that a subsequent
675 * read will return zeroes after an UNMAP or WRITE SAME (16) to an LBA
678 if (((dev->dev_attrib.emulate_tpu != 0) ||
679 (dev->dev_attrib.emulate_tpws != 0)) &&
680 (dev->dev_attrib.unmap_zeroes_data != 0))
686 /* Referrals VPD page */
687 static sense_reason_t
688 spc_emulate_evpd_b3(struct se_cmd *cmd, unsigned char *buf)
690 struct se_device *dev = cmd->se_dev;
692 buf[0] = dev->transport->get_device_type(dev);
694 put_unaligned_be32(dev->t10_alua.lba_map_segment_size, &buf[8]);
695 put_unaligned_be32(dev->t10_alua.lba_map_segment_multiplier, &buf[12]);
700 static sense_reason_t
701 spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf);
705 sense_reason_t (*emulate)(struct se_cmd *, unsigned char *);
706 } evpd_handlers[] = {
707 { .page = 0x00, .emulate = spc_emulate_evpd_00 },
708 { .page = 0x80, .emulate = spc_emulate_evpd_80 },
709 { .page = 0x83, .emulate = spc_emulate_evpd_83 },
710 { .page = 0x86, .emulate = spc_emulate_evpd_86 },
711 { .page = 0xb0, .emulate = spc_emulate_evpd_b0 },
712 { .page = 0xb1, .emulate = spc_emulate_evpd_b1 },
713 { .page = 0xb2, .emulate = spc_emulate_evpd_b2 },
714 { .page = 0xb3, .emulate = spc_emulate_evpd_b3 },
717 /* supported vital product data pages */
718 static sense_reason_t
719 spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf)
724 * Only report the INQUIRY EVPD=1 pages after a valid NAA
725 * Registered Extended LUN WWN has been set via ConfigFS
726 * during device creation/restart.
728 if (cmd->se_dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) {
729 buf[3] = ARRAY_SIZE(evpd_handlers);
730 for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p)
731 buf[p + 4] = evpd_handlers[p].page;
737 static sense_reason_t
738 spc_emulate_inquiry(struct se_cmd *cmd)
740 struct se_device *dev = cmd->se_dev;
742 unsigned char *cdb = cmd->t_task_cdb;
748 buf = kzalloc(SE_INQUIRY_BUF, GFP_KERNEL);
750 pr_err("Unable to allocate response buffer for INQUIRY\n");
751 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
754 buf[0] = dev->transport->get_device_type(dev);
756 if (!(cdb[1] & 0x1)) {
758 pr_err("INQUIRY with EVPD==0 but PAGE CODE=%02x\n",
760 ret = TCM_INVALID_CDB_FIELD;
764 ret = spc_emulate_inquiry_std(cmd, buf);
769 for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p) {
770 if (cdb[2] == evpd_handlers[p].page) {
772 ret = evpd_handlers[p].emulate(cmd, buf);
773 len = get_unaligned_be16(&buf[2]) + 4;
778 pr_debug("Unknown VPD Code: 0x%02x\n", cdb[2]);
779 ret = TCM_INVALID_CDB_FIELD;
782 rbuf = transport_kmap_data_sg(cmd);
784 memcpy(rbuf, buf, min_t(u32, SE_INQUIRY_BUF, cmd->data_length));
785 transport_kunmap_data_sg(cmd);
790 target_complete_cmd_with_length(cmd, SAM_STAT_GOOD, len);
794 static int spc_modesense_rwrecovery(struct se_cmd *cmd, u8 pc, u8 *p)
799 /* No changeable values for now */
807 static int spc_modesense_control(struct se_cmd *cmd, u8 pc, u8 *p)
809 struct se_device *dev = cmd->se_dev;
810 struct se_session *sess = cmd->se_sess;
815 /* No changeable values for now */
819 /* GLTSD: No implicit save of log parameters */
821 if (target_sense_desc_format(dev))
822 /* D_SENSE: Descriptor format sense data for 64bit sectors */
826 * From spc4r23, 7.4.7 Control mode page
828 * The QUEUE ALGORITHM MODIFIER field (see table 368) specifies
829 * restrictions on the algorithm used for reordering commands
830 * having the SIMPLE task attribute (see SAM-4).
832 * Table 368 -- QUEUE ALGORITHM MODIFIER field
834 * 0h Restricted reordering
835 * 1h Unrestricted reordering allowed
837 * 8h to Fh Vendor specific
839 * A value of zero in the QUEUE ALGORITHM MODIFIER field specifies that
840 * the device server shall order the processing sequence of commands
841 * having the SIMPLE task attribute such that data integrity is maintained
842 * for that I_T nexus (i.e., if the transmission of new SCSI transport protocol
843 * requests is halted at any time, the final value of all data observable
844 * on the medium shall be the same as if all the commands had been processed
845 * with the ORDERED task attribute).
847 * A value of one in the QUEUE ALGORITHM MODIFIER field specifies that the
848 * device server may reorder the processing sequence of commands having the
849 * SIMPLE task attribute in any manner. Any data integrity exposures related to
850 * command sequence order shall be explicitly handled by the application client
851 * through the selection of appropriate ommands and task attributes.
853 p[3] = (dev->dev_attrib.emulate_rest_reord == 1) ? 0x00 : 0x10;
855 * From spc4r17, section 7.4.6 Control mode Page
857 * Unit Attention interlocks control (UN_INTLCK_CTRL) to code 00b
859 * 00b: The logical unit shall clear any unit attention condition
860 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
861 * status and shall not establish a unit attention condition when a com-
862 * mand is completed with BUSY, TASK SET FULL, or RESERVATION CONFLICT
865 * 10b: The logical unit shall not clear any unit attention condition
866 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
867 * status and shall not establish a unit attention condition when
868 * a command is completed with BUSY, TASK SET FULL, or RESERVATION
871 * 11b a The logical unit shall not clear any unit attention condition
872 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
873 * status and shall establish a unit attention condition for the
874 * initiator port associated with the I_T nexus on which the BUSY,
875 * TASK SET FULL, or RESERVATION CONFLICT status is being returned.
876 * Depending on the status, the additional sense code shall be set to
877 * PREVIOUS BUSY STATUS, PREVIOUS TASK SET FULL STATUS, or PREVIOUS
878 * RESERVATION CONFLICT STATUS. Until it is cleared by a REQUEST SENSE
879 * command, a unit attention condition shall be established only once
880 * for a BUSY, TASK SET FULL, or RESERVATION CONFLICT status regardless
881 * to the number of commands completed with one of those status codes.
883 switch (dev->dev_attrib.emulate_ua_intlck_ctrl) {
884 case TARGET_UA_INTLCK_CTRL_ESTABLISH_UA:
887 case TARGET_UA_INTLCK_CTRL_NO_CLEAR:
890 default: /* TARGET_UA_INTLCK_CTRL_CLEAR */
895 * From spc4r17, section 7.4.6 Control mode Page
897 * Task Aborted Status (TAS) bit set to zero.
899 * A task aborted status (TAS) bit set to zero specifies that aborted
900 * tasks shall be terminated by the device server without any response
901 * to the application client. A TAS bit set to one specifies that tasks
902 * aborted by the actions of an I_T nexus other than the I_T nexus on
903 * which the command was received shall be completed with TASK ABORTED
904 * status (see SAM-4).
906 p[5] = (dev->dev_attrib.emulate_tas) ? 0x40 : 0x00;
908 * From spc4r30, section 7.5.7 Control mode page
910 * Application Tag Owner (ATO) bit set to one.
912 * If the ATO bit is set to one the device server shall not modify the
913 * LOGICAL BLOCK APPLICATION TAG field and, depending on the protection
914 * type, shall not modify the contents of the LOGICAL BLOCK REFERENCE
917 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
918 if (dev->dev_attrib.pi_prot_type || sess->sess_prot_type)
930 static int spc_modesense_caching(struct se_cmd *cmd, u8 pc, u8 *p)
932 struct se_device *dev = cmd->se_dev;
937 /* No changeable values for now */
941 if (target_check_wce(dev))
942 p[2] = 0x04; /* Write Cache Enable */
943 p[12] = 0x20; /* Disabled Read Ahead */
949 static int spc_modesense_informational_exceptions(struct se_cmd *cmd, u8 pc, unsigned char *p)
954 /* No changeable values for now */
965 int (*emulate)(struct se_cmd *, u8, unsigned char *);
966 } modesense_handlers[] = {
967 { .page = 0x01, .subpage = 0x00, .emulate = spc_modesense_rwrecovery },
968 { .page = 0x08, .subpage = 0x00, .emulate = spc_modesense_caching },
969 { .page = 0x0a, .subpage = 0x00, .emulate = spc_modesense_control },
970 { .page = 0x1c, .subpage = 0x00, .emulate = spc_modesense_informational_exceptions },
973 static void spc_modesense_write_protect(unsigned char *buf, int type)
976 * I believe that the WP bit (bit 7) in the mode header is the same for
983 buf[0] |= 0x80; /* WP bit */
988 static void spc_modesense_dpofua(unsigned char *buf, int type)
992 buf[0] |= 0x10; /* DPOFUA bit */
999 static int spc_modesense_blockdesc(unsigned char *buf, u64 blocks, u32 block_size)
1002 put_unaligned_be32(min(blocks, 0xffffffffull), buf);
1004 put_unaligned_be32(block_size, buf);
1008 static int spc_modesense_long_blockdesc(unsigned char *buf, u64 blocks, u32 block_size)
1010 if (blocks <= 0xffffffff)
1011 return spc_modesense_blockdesc(buf + 3, blocks, block_size) + 3;
1013 *buf++ = 1; /* LONGLBA */
1016 put_unaligned_be64(blocks, buf);
1018 put_unaligned_be32(block_size, buf);
1023 static sense_reason_t spc_emulate_modesense(struct se_cmd *cmd)
1025 struct se_device *dev = cmd->se_dev;
1026 char *cdb = cmd->t_task_cdb;
1027 unsigned char buf[SE_MODE_PAGE_BUF], *rbuf;
1028 int type = dev->transport->get_device_type(dev);
1029 int ten = (cmd->t_task_cdb[0] == MODE_SENSE_10);
1030 bool dbd = !!(cdb[1] & 0x08);
1031 bool llba = ten ? !!(cdb[1] & 0x10) : false;
1032 u8 pc = cdb[2] >> 6;
1033 u8 page = cdb[2] & 0x3f;
1034 u8 subpage = cdb[3];
1039 memset(buf, 0, SE_MODE_PAGE_BUF);
1042 * Skip over MODE DATA LENGTH + MEDIUM TYPE fields to byte 3 for
1043 * MODE_SENSE_10 and byte 2 for MODE_SENSE (6).
1045 length = ten ? 3 : 2;
1047 /* DEVICE-SPECIFIC PARAMETER */
1048 if (cmd->se_lun->lun_access_ro || target_lun_is_rdonly(cmd))
1049 spc_modesense_write_protect(&buf[length], type);
1052 * SBC only allows us to enable FUA and DPO together. Fortunately
1053 * DPO is explicitly specified as a hint, so a noop is a perfectly
1054 * valid implementation.
1056 if (target_check_fua(dev))
1057 spc_modesense_dpofua(&buf[length], type);
1061 /* BLOCK DESCRIPTOR */
1064 * For now we only include a block descriptor for disk (SBC)
1065 * devices; other command sets use a slightly different format.
1067 if (!dbd && type == TYPE_DISK) {
1068 u64 blocks = dev->transport->get_blocks(dev);
1069 u32 block_size = dev->dev_attrib.block_size;
1073 length += spc_modesense_long_blockdesc(&buf[length],
1074 blocks, block_size);
1077 length += spc_modesense_blockdesc(&buf[length],
1078 blocks, block_size);
1081 length += spc_modesense_blockdesc(&buf[length], blocks,
1092 if (subpage != 0x00 && subpage != 0xff) {
1093 pr_warn("MODE_SENSE: Invalid subpage code: 0x%02x\n", subpage);
1094 return TCM_INVALID_CDB_FIELD;
1097 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i) {
1099 * Tricky way to say all subpage 00h for
1100 * subpage==0, all subpages for subpage==0xff
1101 * (and we just checked above that those are
1102 * the only two possibilities).
1104 if ((modesense_handlers[i].subpage & ~subpage) == 0) {
1105 ret = modesense_handlers[i].emulate(cmd, pc, &buf[length]);
1106 if (!ten && length + ret >= 255)
1115 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i)
1116 if (modesense_handlers[i].page == page &&
1117 modesense_handlers[i].subpage == subpage) {
1118 length += modesense_handlers[i].emulate(cmd, pc, &buf[length]);
1123 * We don't intend to implement:
1124 * - obsolete page 03h "format parameters" (checked by Solaris)
1127 pr_err("MODE SENSE: unimplemented page/subpage: 0x%02x/0x%02x\n",
1130 return TCM_UNKNOWN_MODE_PAGE;
1134 put_unaligned_be16(length - 2, buf);
1136 buf[0] = length - 1;
1138 rbuf = transport_kmap_data_sg(cmd);
1140 memcpy(rbuf, buf, min_t(u32, SE_MODE_PAGE_BUF, cmd->data_length));
1141 transport_kunmap_data_sg(cmd);
1144 target_complete_cmd_with_length(cmd, SAM_STAT_GOOD, length);
1148 static sense_reason_t spc_emulate_modeselect(struct se_cmd *cmd)
1150 char *cdb = cmd->t_task_cdb;
1151 bool ten = cdb[0] == MODE_SELECT_10;
1152 int off = ten ? 8 : 4;
1153 bool pf = !!(cdb[1] & 0x10);
1156 unsigned char tbuf[SE_MODE_PAGE_BUF];
1158 sense_reason_t ret = 0;
1161 if (!cmd->data_length) {
1162 target_complete_cmd(cmd, SAM_STAT_GOOD);
1166 if (cmd->data_length < off + 2)
1167 return TCM_PARAMETER_LIST_LENGTH_ERROR;
1169 buf = transport_kmap_data_sg(cmd);
1171 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1174 ret = TCM_INVALID_CDB_FIELD;
1178 page = buf[off] & 0x3f;
1179 subpage = buf[off] & 0x40 ? buf[off + 1] : 0;
1181 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i)
1182 if (modesense_handlers[i].page == page &&
1183 modesense_handlers[i].subpage == subpage) {
1184 memset(tbuf, 0, SE_MODE_PAGE_BUF);
1185 length = modesense_handlers[i].emulate(cmd, 0, tbuf);
1186 goto check_contents;
1189 ret = TCM_UNKNOWN_MODE_PAGE;
1193 if (cmd->data_length < off + length) {
1194 ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
1198 if (memcmp(buf + off, tbuf, length))
1199 ret = TCM_INVALID_PARAMETER_LIST;
1202 transport_kunmap_data_sg(cmd);
1205 target_complete_cmd(cmd, SAM_STAT_GOOD);
1209 static sense_reason_t spc_emulate_request_sense(struct se_cmd *cmd)
1211 unsigned char *cdb = cmd->t_task_cdb;
1212 unsigned char *rbuf;
1213 u8 ua_asc = 0, ua_ascq = 0;
1214 unsigned char buf[SE_SENSE_BUF];
1215 bool desc_format = target_sense_desc_format(cmd->se_dev);
1217 memset(buf, 0, SE_SENSE_BUF);
1219 if (cdb[1] & 0x01) {
1220 pr_err("REQUEST_SENSE description emulation not"
1222 return TCM_INVALID_CDB_FIELD;
1225 rbuf = transport_kmap_data_sg(cmd);
1227 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1229 if (!core_scsi3_ua_clear_for_request_sense(cmd, &ua_asc, &ua_ascq))
1230 scsi_build_sense_buffer(desc_format, buf, UNIT_ATTENTION,
1233 scsi_build_sense_buffer(desc_format, buf, NO_SENSE, 0x0, 0x0);
1235 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
1236 transport_kunmap_data_sg(cmd);
1238 target_complete_cmd(cmd, SAM_STAT_GOOD);
1242 sense_reason_t spc_emulate_report_luns(struct se_cmd *cmd)
1244 struct se_dev_entry *deve;
1245 struct se_session *sess = cmd->se_sess;
1246 struct se_node_acl *nacl;
1247 struct scsi_lun slun;
1249 u32 lun_count = 0, offset = 8;
1252 buf = transport_kmap_data_sg(cmd);
1253 if (cmd->data_length && !buf)
1254 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1257 * If no struct se_session pointer is present, this struct se_cmd is
1258 * coming via a target_core_mod PASSTHROUGH op, and not through
1259 * a $FABRIC_MOD. In that case, report LUN=0 only.
1264 nacl = sess->se_node_acl;
1267 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
1269 * We determine the correct LUN LIST LENGTH even once we
1270 * have reached the initial allocation length.
1271 * See SPC2-R20 7.19.
1274 if (offset >= cmd->data_length)
1277 int_to_scsilun(deve->mapped_lun, &slun);
1278 memcpy(buf + offset, &slun,
1279 min(8u, cmd->data_length - offset));
1285 * See SPC3 r07, page 159.
1289 * If no LUNs are accessible, report virtual LUN 0.
1291 if (lun_count == 0) {
1292 int_to_scsilun(0, &slun);
1293 if (cmd->data_length > 8)
1294 memcpy(buf + offset, &slun,
1295 min(8u, cmd->data_length - offset));
1300 len = cpu_to_be32(lun_count * 8);
1301 memcpy(buf, &len, min_t(int, sizeof len, cmd->data_length));
1302 transport_kunmap_data_sg(cmd);
1305 target_complete_cmd_with_length(cmd, SAM_STAT_GOOD, 8 + lun_count * 8);
1308 EXPORT_SYMBOL(spc_emulate_report_luns);
1310 static sense_reason_t
1311 spc_emulate_testunitready(struct se_cmd *cmd)
1313 target_complete_cmd(cmd, SAM_STAT_GOOD);
1318 spc_parse_cdb(struct se_cmd *cmd, unsigned int *size)
1320 struct se_device *dev = cmd->se_dev;
1321 unsigned char *cdb = cmd->t_task_cdb;
1323 if (!dev->dev_attrib.emulate_pr &&
1324 ((cdb[0] == PERSISTENT_RESERVE_IN) ||
1325 (cdb[0] == PERSISTENT_RESERVE_OUT) ||
1326 (cdb[0] == RELEASE || cdb[0] == RELEASE_10) ||
1327 (cdb[0] == RESERVE || cdb[0] == RESERVE_10))) {
1328 return TCM_UNSUPPORTED_SCSI_OPCODE;
1334 cmd->execute_cmd = spc_emulate_modeselect;
1336 case MODE_SELECT_10:
1337 *size = get_unaligned_be16(&cdb[7]);
1338 cmd->execute_cmd = spc_emulate_modeselect;
1342 cmd->execute_cmd = spc_emulate_modesense;
1345 *size = get_unaligned_be16(&cdb[7]);
1346 cmd->execute_cmd = spc_emulate_modesense;
1350 *size = get_unaligned_be16(&cdb[7]);
1352 case PERSISTENT_RESERVE_IN:
1353 *size = get_unaligned_be16(&cdb[7]);
1354 cmd->execute_cmd = target_scsi3_emulate_pr_in;
1356 case PERSISTENT_RESERVE_OUT:
1357 *size = get_unaligned_be32(&cdb[5]);
1358 cmd->execute_cmd = target_scsi3_emulate_pr_out;
1362 if (cdb[0] == RELEASE_10)
1363 *size = get_unaligned_be16(&cdb[7]);
1365 *size = cmd->data_length;
1367 cmd->execute_cmd = target_scsi2_reservation_release;
1372 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
1373 * Assume the passthrough or $FABRIC_MOD will tell us about it.
1375 if (cdb[0] == RESERVE_10)
1376 *size = get_unaligned_be16(&cdb[7]);
1378 *size = cmd->data_length;
1380 cmd->execute_cmd = target_scsi2_reservation_reserve;
1384 cmd->execute_cmd = spc_emulate_request_sense;
1387 *size = get_unaligned_be16(&cdb[3]);
1390 * Do implicit HEAD_OF_QUEUE processing for INQUIRY.
1391 * See spc4r17 section 5.3
1393 cmd->sam_task_attr = TCM_HEAD_TAG;
1394 cmd->execute_cmd = spc_emulate_inquiry;
1396 case SECURITY_PROTOCOL_IN:
1397 case SECURITY_PROTOCOL_OUT:
1398 *size = get_unaligned_be32(&cdb[6]);
1401 *size = get_unaligned_be32(&cdb[10]);
1402 cmd->execute_cmd = target_do_xcopy;
1404 case RECEIVE_COPY_RESULTS:
1405 *size = get_unaligned_be32(&cdb[10]);
1406 cmd->execute_cmd = target_do_receive_copy_results;
1408 case READ_ATTRIBUTE:
1409 case WRITE_ATTRIBUTE:
1410 *size = get_unaligned_be32(&cdb[10]);
1412 case RECEIVE_DIAGNOSTIC:
1413 case SEND_DIAGNOSTIC:
1414 *size = get_unaligned_be16(&cdb[3]);
1417 *size = get_unaligned_be24(&cdb[6]);
1420 cmd->execute_cmd = spc_emulate_report_luns;
1421 *size = get_unaligned_be32(&cdb[6]);
1423 * Do implicit HEAD_OF_QUEUE processing for REPORT_LUNS
1424 * See spc4r17 section 5.3
1426 cmd->sam_task_attr = TCM_HEAD_TAG;
1428 case TEST_UNIT_READY:
1429 cmd->execute_cmd = spc_emulate_testunitready;
1432 case MAINTENANCE_IN:
1433 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
1435 * MAINTENANCE_IN from SCC-2
1436 * Check for emulated MI_REPORT_TARGET_PGS
1438 if ((cdb[1] & 0x1f) == MI_REPORT_TARGET_PGS) {
1440 target_emulate_report_target_port_groups;
1442 *size = get_unaligned_be32(&cdb[6]);
1445 * GPCMD_SEND_KEY from multi media commands
1447 *size = get_unaligned_be16(&cdb[8]);
1450 case MAINTENANCE_OUT:
1451 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
1453 * MAINTENANCE_OUT from SCC-2
1454 * Check for emulated MO_SET_TARGET_PGS.
1456 if (cdb[1] == MO_SET_TARGET_PGS) {
1458 target_emulate_set_target_port_groups;
1460 *size = get_unaligned_be32(&cdb[6]);
1463 * GPCMD_SEND_KEY from multi media commands
1465 *size = get_unaligned_be16(&cdb[8]);
1469 return TCM_UNSUPPORTED_SCSI_OPCODE;
1474 EXPORT_SYMBOL(spc_parse_cdb);