2 * CDB emulation for non-READ/WRITE commands.
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 <asm/unaligned.h>
27 #include <scsi/scsi.h>
29 #include <target/target_core_base.h>
30 #include <target/target_core_transport.h>
31 #include <target/target_core_fabric_ops.h>
32 #include "target_core_ua.h"
35 target_fill_alua_data(struct se_port *port, unsigned char *buf)
37 struct t10_alua_tg_pt_gp *tg_pt_gp;
38 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
41 * Set SCCS for MAINTENANCE_IN + REPORT_TARGET_PORT_GROUPS.
46 * Set TPGS field for explict and/or implict ALUA access type
49 * See spc4r17 section 6.4.2 Table 135
53 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
57 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
58 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
60 buf[5] |= tg_pt_gp->tg_pt_gp_alua_access_type;
61 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
65 target_emulate_inquiry_std(struct se_cmd *cmd)
67 struct se_lun *lun = cmd->se_lun;
68 struct se_device *dev = cmd->se_dev;
72 * Make sure we at least have 6 bytes of INQUIRY response
73 * payload going back for EVPD=0
75 if (cmd->data_length < 6) {
76 printk(KERN_ERR "SCSI Inquiry payload length: %u"
77 " too small for EVPD=0\n", cmd->data_length);
81 buf = transport_kmap_first_data_page(cmd);
83 buf[0] = dev->transport->get_device_type(dev);
84 if (buf[0] == TYPE_TAPE)
86 buf[2] = dev->transport->get_device_rev(dev);
89 * Enable SCCS and TPGS fields for Emulated ALUA
91 if (dev->se_sub_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED)
92 target_fill_alua_data(lun->lun_sep, buf);
94 if (cmd->data_length < 8) {
95 buf[4] = 1; /* Set additional length to 1 */
99 buf[7] = 0x32; /* Sync=1 and CmdQue=1 */
102 * Do not include vendor, product, reversion info in INQUIRY
103 * response payload for cdbs with a small allocation length.
105 if (cmd->data_length < 36) {
106 buf[4] = 3; /* Set additional length to 3 */
110 snprintf((unsigned char *)&buf[8], 8, "LIO-ORG");
111 snprintf((unsigned char *)&buf[16], 16, "%s",
112 &dev->se_sub_dev->t10_wwn.model[0]);
113 snprintf((unsigned char *)&buf[32], 4, "%s",
114 &dev->se_sub_dev->t10_wwn.revision[0]);
115 buf[4] = 31; /* Set additional length to 31 */
118 transport_kunmap_first_data_page(cmd);
122 /* unit serial number */
124 target_emulate_evpd_80(struct se_cmd *cmd, unsigned char *buf)
126 struct se_device *dev = cmd->se_dev;
129 if (dev->se_sub_dev->su_dev_flags &
130 SDF_EMULATED_VPD_UNIT_SERIAL) {
134 strlen(&dev->se_sub_dev->t10_wwn.unit_serial[0]);
135 unit_serial_len++; /* For NULL Terminator */
137 if (((len + 4) + unit_serial_len) > cmd->data_length) {
138 len += unit_serial_len;
139 buf[2] = ((len >> 8) & 0xff);
140 buf[3] = (len & 0xff);
143 len += sprintf((unsigned char *)&buf[4], "%s",
144 &dev->se_sub_dev->t10_wwn.unit_serial[0]);
145 len++; /* Extra Byte for NULL Terminator */
152 * Device identification VPD, for a complete list of
153 * DESIGNATOR TYPEs see spc4r17 Table 459.
156 target_emulate_evpd_83(struct se_cmd *cmd, unsigned char *buf)
158 struct se_device *dev = cmd->se_dev;
159 struct se_lun *lun = cmd->se_lun;
160 struct se_port *port = NULL;
161 struct se_portal_group *tpg = NULL;
162 struct t10_alua_lu_gp_member *lu_gp_mem;
163 struct t10_alua_tg_pt_gp *tg_pt_gp;
164 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
165 unsigned char binary, binary_new;
166 unsigned char *prod = &dev->se_sub_dev->t10_wwn.model[0];
168 u32 unit_serial_len, off = 0;
175 * NAA IEEE Registered Extended Assigned designator format, see
176 * spc4r17 section 7.7.3.6.5
178 * We depend upon a target_core_mod/ConfigFS provided
179 * /sys/kernel/config/target/core/$HBA/$DEV/wwn/vpd_unit_serial
180 * value in order to return the NAA id.
182 if (!(dev->se_sub_dev->su_dev_flags & SDF_EMULATED_VPD_UNIT_SERIAL))
183 goto check_t10_vend_desc;
185 if (off + 20 > cmd->data_length)
186 goto check_t10_vend_desc;
188 /* CODE SET == Binary */
191 /* Set ASSOICATION == addressed logical unit: 0)b */
194 /* Identifier/Designator type == NAA identifier */
198 /* Identifier/Designator length */
202 * Start NAA IEEE Registered Extended Identifier/Designator
204 buf[off++] = (0x6 << 4);
207 * Use OpenFabrics IEEE Company ID: 00 14 05
211 buf[off] = (0x5 << 4);
214 * Return ConfigFS Unit Serial Number information for
215 * VENDOR_SPECIFIC_IDENTIFIER and
216 * VENDOR_SPECIFIC_IDENTIFIER_EXTENTION
218 binary = transport_asciihex_to_binaryhex(
219 &dev->se_sub_dev->t10_wwn.unit_serial[0]);
220 buf[off++] |= (binary & 0xf0) >> 4;
221 for (i = 0; i < 24; i += 2) {
222 binary_new = transport_asciihex_to_binaryhex(
223 &dev->se_sub_dev->t10_wwn.unit_serial[i+2]);
224 buf[off] = (binary & 0x0f) << 4;
225 buf[off++] |= (binary_new & 0xf0) >> 4;
233 * T10 Vendor Identifier Page, see spc4r17 section 7.7.3.4
235 id_len = 8; /* For Vendor field */
236 prod_len = 4; /* For VPD Header */
237 prod_len += 8; /* For Vendor field */
238 prod_len += strlen(prod);
239 prod_len++; /* For : */
241 if (dev->se_sub_dev->su_dev_flags &
242 SDF_EMULATED_VPD_UNIT_SERIAL) {
244 strlen(&dev->se_sub_dev->t10_wwn.unit_serial[0]);
245 unit_serial_len++; /* For NULL Terminator */
247 if ((len + (id_len + 4) +
248 (prod_len + unit_serial_len)) >
250 len += (prod_len + unit_serial_len);
253 id_len += sprintf((unsigned char *)&buf[off+12],
255 &dev->se_sub_dev->t10_wwn.unit_serial[0]);
257 buf[off] = 0x2; /* ASCII */
258 buf[off+1] = 0x1; /* T10 Vendor ID */
260 memcpy((unsigned char *)&buf[off+4], "LIO-ORG", 8);
261 /* Extra Byte for NULL Terminator */
263 /* Identifier Length */
265 /* Header size for Designation descriptor */
269 * struct se_port is only set for INQUIRY VPD=1 through $FABRIC_MOD
274 struct t10_alua_lu_gp *lu_gp;
275 u32 padding, scsi_name_len;
282 * Relative target port identifer, see spc4r17
285 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
286 * section 7.5.1 Table 362
288 if (((len + 4) + 8) > cmd->data_length) {
293 (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
294 buf[off++] |= 0x1; /* CODE SET == Binary */
295 buf[off] = 0x80; /* Set PIV=1 */
296 /* Set ASSOICATION == target port: 01b */
298 /* DESIGNATOR TYPE == Relative target port identifer */
300 off++; /* Skip over Reserved */
301 buf[off++] = 4; /* DESIGNATOR LENGTH */
302 /* Skip over Obsolete field in RTPI payload
305 buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
306 buf[off++] = (port->sep_rtpi & 0xff);
307 len += 8; /* Header size + Designation descriptor */
309 * Target port group identifier, see spc4r17
312 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
313 * section 7.5.1 Table 362
316 if (dev->se_sub_dev->t10_alua.alua_type !=
318 goto check_scsi_name;
320 if (((len + 4) + 8) > cmd->data_length) {
324 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
328 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
329 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
331 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
334 tg_pt_gp_id = tg_pt_gp->tg_pt_gp_id;
335 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
338 (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
339 buf[off++] |= 0x1; /* CODE SET == Binary */
340 buf[off] = 0x80; /* Set PIV=1 */
341 /* Set ASSOICATION == target port: 01b */
343 /* DESIGNATOR TYPE == Target port group identifier */
345 off++; /* Skip over Reserved */
346 buf[off++] = 4; /* DESIGNATOR LENGTH */
347 off += 2; /* Skip over Reserved Field */
348 buf[off++] = ((tg_pt_gp_id >> 8) & 0xff);
349 buf[off++] = (tg_pt_gp_id & 0xff);
350 len += 8; /* Header size + Designation descriptor */
352 * Logical Unit Group identifier, see spc4r17
356 if (((len + 4) + 8) > cmd->data_length) {
358 goto check_scsi_name;
360 lu_gp_mem = dev->dev_alua_lu_gp_mem;
362 goto check_scsi_name;
364 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
365 lu_gp = lu_gp_mem->lu_gp;
367 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
368 goto check_scsi_name;
370 lu_gp_id = lu_gp->lu_gp_id;
371 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
373 buf[off++] |= 0x1; /* CODE SET == Binary */
374 /* DESIGNATOR TYPE == Logical Unit Group identifier */
376 off++; /* Skip over Reserved */
377 buf[off++] = 4; /* DESIGNATOR LENGTH */
378 off += 2; /* Skip over Reserved Field */
379 buf[off++] = ((lu_gp_id >> 8) & 0xff);
380 buf[off++] = (lu_gp_id & 0xff);
381 len += 8; /* Header size + Designation descriptor */
383 * SCSI name string designator, see spc4r17
386 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
387 * section 7.5.1 Table 362
390 scsi_name_len = strlen(tpg->se_tpg_tfo->tpg_get_wwn(tpg));
391 /* UTF-8 ",t,0x<16-bit TPGT>" + NULL Terminator */
393 /* Check for 4-byte padding */
394 padding = ((-scsi_name_len) & 3);
396 scsi_name_len += padding;
397 /* Header size + Designation descriptor */
400 if (((len + 4) + scsi_name_len) > cmd->data_length) {
401 len += scsi_name_len;
405 (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
406 buf[off++] |= 0x3; /* CODE SET == UTF-8 */
407 buf[off] = 0x80; /* Set PIV=1 */
408 /* Set ASSOICATION == target port: 01b */
410 /* DESIGNATOR TYPE == SCSI name string */
412 off += 2; /* Skip over Reserved and length */
414 * SCSI name string identifer containing, $FABRIC_MOD
415 * dependent information. For LIO-Target and iSCSI
416 * Target Port, this means "<iSCSI name>,t,0x<TPGT> in
419 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
420 scsi_name_len = sprintf(&buf[off], "%s,t,0x%04x",
421 tpg->se_tpg_tfo->tpg_get_wwn(tpg), tpgt);
422 scsi_name_len += 1 /* Include NULL terminator */;
424 * The null-terminated, null-padded (see 4.4.2) SCSI
425 * NAME STRING field contains a UTF-8 format string.
426 * The number of bytes in the SCSI NAME STRING field
427 * (i.e., the value in the DESIGNATOR LENGTH field)
428 * shall be no larger than 256 and shall be a multiple
432 scsi_name_len += padding;
434 buf[off-1] = scsi_name_len;
435 off += scsi_name_len;
436 /* Header size + Designation descriptor */
437 len += (scsi_name_len + 4);
440 buf[2] = ((len >> 8) & 0xff);
441 buf[3] = (len & 0xff); /* Page Length for VPD 0x83 */
445 /* Extended INQUIRY Data VPD Page */
447 target_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf)
449 if (cmd->data_length < 60)
453 /* Set HEADSUP, ORDSUP, SIMPSUP */
456 /* If WriteCache emulation is enabled, set V_SUP */
457 if (cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0)
462 /* Block Limits VPD page */
464 target_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf)
466 struct se_device *dev = cmd->se_dev;
470 * Following sbc3r22 section 6.5.3 Block Limits VPD page, when
471 * emulate_tpu=1 or emulate_tpws=1 we will be expect a
472 * different page length for Thin Provisioning.
474 if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws)
477 if (cmd->data_length < (0x10 + 4)) {
478 printk(KERN_INFO "Received data_length: %u"
479 " too small for EVPD 0xb0\n",
484 if (have_tp && cmd->data_length < (0x3c + 4)) {
485 printk(KERN_INFO "Received data_length: %u"
486 " too small for TPE=1 EVPD 0xb0\n",
491 buf[0] = dev->transport->get_device_type(dev);
492 buf[3] = have_tp ? 0x3c : 0x10;
495 * Set OPTIMAL TRANSFER LENGTH GRANULARITY
497 put_unaligned_be16(1, &buf[6]);
500 * Set MAXIMUM TRANSFER LENGTH
502 put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.max_sectors, &buf[8]);
505 * Set OPTIMAL TRANSFER LENGTH
507 put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.optimal_sectors, &buf[12]);
510 * Exit now if we don't support TP or the initiator sent a too
513 if (!have_tp || cmd->data_length < (0x3c + 4))
517 * Set MAXIMUM UNMAP LBA COUNT
519 put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count, &buf[20]);
522 * Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT
524 put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count,
528 * Set OPTIMAL UNMAP GRANULARITY
530 put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.unmap_granularity, &buf[28]);
533 * UNMAP GRANULARITY ALIGNMENT
535 put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment,
537 if (dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment != 0)
538 buf[32] |= 0x80; /* Set the UGAVALID bit */
543 /* Block Device Characteristics VPD page */
545 target_emulate_evpd_b1(struct se_cmd *cmd, unsigned char *buf)
547 struct se_device *dev = cmd->se_dev;
549 buf[0] = dev->transport->get_device_type(dev);
552 if (cmd->data_length >= 5 &&
553 dev->se_sub_dev->se_dev_attrib.is_nonrot)
559 /* Thin Provisioning VPD */
561 target_emulate_evpd_b2(struct se_cmd *cmd, unsigned char *buf)
563 struct se_device *dev = cmd->se_dev;
566 * From sbc3r22 section 6.5.4 Thin Provisioning VPD page:
568 * The PAGE LENGTH field is defined in SPC-4. If the DP bit is set to
569 * zero, then the page length shall be set to 0004h. If the DP bit
570 * is set to one, then the page length shall be set to the value
571 * defined in table 162.
573 buf[0] = dev->transport->get_device_type(dev);
576 * Set Hardcoded length mentioned above for DP=0
578 put_unaligned_be16(0x0004, &buf[2]);
581 * The THRESHOLD EXPONENT field indicates the threshold set size in
582 * LBAs as a power of 2 (i.e., the threshold set size is equal to
583 * 2(threshold exponent)).
585 * Note that this is currently set to 0x00 as mkp says it will be
586 * changing again. We can enable this once it has settled in T10
587 * and is actually used by Linux/SCSI ML code.
592 * A TPU bit set to one indicates that the device server supports
593 * the UNMAP command (see 5.25). A TPU bit set to zero indicates
594 * that the device server does not support the UNMAP command.
596 if (dev->se_sub_dev->se_dev_attrib.emulate_tpu != 0)
600 * A TPWS bit set to one indicates that the device server supports
601 * the use of the WRITE SAME (16) command (see 5.42) to unmap LBAs.
602 * A TPWS bit set to zero indicates that the device server does not
603 * support the use of the WRITE SAME (16) command to unmap LBAs.
605 if (dev->se_sub_dev->se_dev_attrib.emulate_tpws != 0)
612 target_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf);
616 int (*emulate)(struct se_cmd *, unsigned char *);
617 } evpd_handlers[] = {
618 { .page = 0x00, .emulate = target_emulate_evpd_00 },
619 { .page = 0x80, .emulate = target_emulate_evpd_80 },
620 { .page = 0x83, .emulate = target_emulate_evpd_83 },
621 { .page = 0x86, .emulate = target_emulate_evpd_86 },
622 { .page = 0xb0, .emulate = target_emulate_evpd_b0 },
623 { .page = 0xb1, .emulate = target_emulate_evpd_b1 },
624 { .page = 0xb2, .emulate = target_emulate_evpd_b2 },
627 /* supported vital product data pages */
629 target_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf)
633 if (cmd->data_length < 8)
636 * Only report the INQUIRY EVPD=1 pages after a valid NAA
637 * Registered Extended LUN WWN has been set via ConfigFS
638 * during device creation/restart.
640 if (cmd->se_dev->se_sub_dev->su_dev_flags &
641 SDF_EMULATED_VPD_UNIT_SERIAL) {
642 buf[3] = ARRAY_SIZE(evpd_handlers);
643 for (p = 0; p < min_t(int, ARRAY_SIZE(evpd_handlers),
644 cmd->data_length - 4); ++p)
645 buf[p + 4] = evpd_handlers[p].page;
652 target_emulate_inquiry(struct se_cmd *cmd)
654 struct se_device *dev = cmd->se_dev;
656 unsigned char *cdb = cmd->t_task_cdb;
660 return target_emulate_inquiry_std(cmd);
663 * Make sure we at least have 4 bytes of INQUIRY response
664 * payload for 0x00 going back for EVPD=1. Note that 0x80
665 * and 0x83 will check for enough payload data length and
666 * jump to set_len: label when there is not enough inquiry EVPD
667 * payload length left for the next outgoing EVPD metadata
669 if (cmd->data_length < 4) {
670 printk(KERN_ERR "SCSI Inquiry payload length: %u"
671 " too small for EVPD=1\n", cmd->data_length);
675 buf = transport_kmap_first_data_page(cmd);
677 buf[0] = dev->transport->get_device_type(dev);
679 for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p)
680 if (cdb[2] == evpd_handlers[p].page) {
682 ret = evpd_handlers[p].emulate(cmd, buf);
683 transport_kunmap_first_data_page(cmd);
687 transport_kunmap_first_data_page(cmd);
688 printk(KERN_ERR "Unknown VPD Code: 0x%02x\n", cdb[2]);
693 target_emulate_readcapacity(struct se_cmd *cmd)
695 struct se_device *dev = cmd->se_dev;
697 unsigned long long blocks_long = dev->transport->get_blocks(dev);
700 if (blocks_long >= 0x00000000ffffffff)
703 blocks = (u32)blocks_long;
705 buf = transport_kmap_first_data_page(cmd);
707 buf[0] = (blocks >> 24) & 0xff;
708 buf[1] = (blocks >> 16) & 0xff;
709 buf[2] = (blocks >> 8) & 0xff;
710 buf[3] = blocks & 0xff;
711 buf[4] = (dev->se_sub_dev->se_dev_attrib.block_size >> 24) & 0xff;
712 buf[5] = (dev->se_sub_dev->se_dev_attrib.block_size >> 16) & 0xff;
713 buf[6] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff;
714 buf[7] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff;
716 * Set max 32-bit blocks to signal SERVICE ACTION READ_CAPACITY_16
718 if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws)
719 put_unaligned_be32(0xFFFFFFFF, &buf[0]);
721 transport_kunmap_first_data_page(cmd);
727 target_emulate_readcapacity_16(struct se_cmd *cmd)
729 struct se_device *dev = cmd->se_dev;
731 unsigned long long blocks = dev->transport->get_blocks(dev);
733 buf = transport_kmap_first_data_page(cmd);
735 buf[0] = (blocks >> 56) & 0xff;
736 buf[1] = (blocks >> 48) & 0xff;
737 buf[2] = (blocks >> 40) & 0xff;
738 buf[3] = (blocks >> 32) & 0xff;
739 buf[4] = (blocks >> 24) & 0xff;
740 buf[5] = (blocks >> 16) & 0xff;
741 buf[6] = (blocks >> 8) & 0xff;
742 buf[7] = blocks & 0xff;
743 buf[8] = (dev->se_sub_dev->se_dev_attrib.block_size >> 24) & 0xff;
744 buf[9] = (dev->se_sub_dev->se_dev_attrib.block_size >> 16) & 0xff;
745 buf[10] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff;
746 buf[11] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff;
748 * Set Thin Provisioning Enable bit following sbc3r22 in section
749 * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled.
751 if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws)
754 transport_kunmap_first_data_page(cmd);
760 target_modesense_rwrecovery(unsigned char *p)
769 target_modesense_control(struct se_device *dev, unsigned char *p)
775 * From spc4r17, section 7.4.6 Control mode Page
777 * Unit Attention interlocks control (UN_INTLCK_CTRL) to code 00b
779 * 00b: The logical unit shall clear any unit attention condition
780 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
781 * status and shall not establish a unit attention condition when a com-
782 * mand is completed with BUSY, TASK SET FULL, or RESERVATION CONFLICT
785 * 10b: The logical unit shall not clear any unit attention condition
786 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
787 * status and shall not establish a unit attention condition when
788 * a command is completed with BUSY, TASK SET FULL, or RESERVATION
791 * 11b a The logical unit shall not clear any unit attention condition
792 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
793 * status and shall establish a unit attention condition for the
794 * initiator port associated with the I_T nexus on which the BUSY,
795 * TASK SET FULL, or RESERVATION CONFLICT status is being returned.
796 * Depending on the status, the additional sense code shall be set to
797 * PREVIOUS BUSY STATUS, PREVIOUS TASK SET FULL STATUS, or PREVIOUS
798 * RESERVATION CONFLICT STATUS. Until it is cleared by a REQUEST SENSE
799 * command, a unit attention condition shall be established only once
800 * for a BUSY, TASK SET FULL, or RESERVATION CONFLICT status regardless
801 * to the number of commands completed with one of those status codes.
803 p[4] = (dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2) ? 0x30 :
804 (dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 1) ? 0x20 : 0x00;
806 * From spc4r17, section 7.4.6 Control mode Page
808 * Task Aborted Status (TAS) bit set to zero.
810 * A task aborted status (TAS) bit set to zero specifies that aborted
811 * tasks shall be terminated by the device server without any response
812 * to the application client. A TAS bit set to one specifies that tasks
813 * aborted by the actions of an I_T nexus other than the I_T nexus on
814 * which the command was received shall be completed with TASK ABORTED
815 * status (see SAM-4).
817 p[5] = (dev->se_sub_dev->se_dev_attrib.emulate_tas) ? 0x40 : 0x00;
826 target_modesense_caching(struct se_device *dev, unsigned char *p)
830 if (dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0)
831 p[2] = 0x04; /* Write Cache Enable */
832 p[12] = 0x20; /* Disabled Read Ahead */
838 target_modesense_write_protect(unsigned char *buf, int type)
841 * I believe that the WP bit (bit 7) in the mode header is the same for
848 buf[0] |= 0x80; /* WP bit */
854 target_modesense_dpofua(unsigned char *buf, int type)
858 buf[0] |= 0x10; /* DPOFUA bit */
866 target_emulate_modesense(struct se_cmd *cmd, int ten)
868 struct se_device *dev = cmd->se_dev;
869 char *cdb = cmd->t_task_cdb;
871 int type = dev->transport->get_device_type(dev);
872 int offset = (ten) ? 8 : 4;
874 unsigned char buf[SE_MODE_PAGE_BUF];
876 memset(buf, 0, SE_MODE_PAGE_BUF);
878 switch (cdb[2] & 0x3f) {
880 length = target_modesense_rwrecovery(&buf[offset]);
883 length = target_modesense_caching(dev, &buf[offset]);
886 length = target_modesense_control(dev, &buf[offset]);
889 length = target_modesense_rwrecovery(&buf[offset]);
890 length += target_modesense_caching(dev, &buf[offset+length]);
891 length += target_modesense_control(dev, &buf[offset+length]);
894 printk(KERN_ERR "Got Unknown Mode Page: 0x%02x\n",
896 return PYX_TRANSPORT_UNKNOWN_MODE_PAGE;
902 buf[0] = (offset >> 8) & 0xff;
903 buf[1] = offset & 0xff;
905 if ((cmd->se_lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) ||
907 (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)))
908 target_modesense_write_protect(&buf[3], type);
910 if ((dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0) &&
911 (dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0))
912 target_modesense_dpofua(&buf[3], type);
914 if ((offset + 2) > cmd->data_length)
915 offset = cmd->data_length;
919 buf[0] = offset & 0xff;
921 if ((cmd->se_lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) ||
923 (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)))
924 target_modesense_write_protect(&buf[2], type);
926 if ((dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0) &&
927 (dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0))
928 target_modesense_dpofua(&buf[2], type);
930 if ((offset + 1) > cmd->data_length)
931 offset = cmd->data_length;
934 rbuf = transport_kmap_first_data_page(cmd);
935 memcpy(rbuf, buf, offset);
936 transport_kunmap_first_data_page(cmd);
942 target_emulate_request_sense(struct se_cmd *cmd)
944 unsigned char *cdb = cmd->t_task_cdb;
946 u8 ua_asc = 0, ua_ascq = 0;
950 printk(KERN_ERR "REQUEST_SENSE description emulation not"
952 return PYX_TRANSPORT_INVALID_CDB_FIELD;
955 buf = transport_kmap_first_data_page(cmd);
957 if (!(core_scsi3_ua_clear_for_request_sense(cmd, &ua_asc, &ua_ascq))) {
959 * CURRENT ERROR, UNIT ATTENTION
962 buf[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
964 * Make sure request data length is enough for additional
967 if (cmd->data_length <= 18) {
973 * The Additional Sense Code (ASC) from the UNIT ATTENTION
975 buf[SPC_ASC_KEY_OFFSET] = ua_asc;
976 buf[SPC_ASCQ_KEY_OFFSET] = ua_ascq;
980 * CURRENT ERROR, NO SENSE
983 buf[SPC_SENSE_KEY_OFFSET] = NO_SENSE;
985 * Make sure request data length is enough for additional
988 if (cmd->data_length <= 18) {
994 * NO ADDITIONAL SENSE INFORMATION
996 buf[SPC_ASC_KEY_OFFSET] = 0x00;
1001 transport_kunmap_first_data_page(cmd);
1007 * Used for TCM/IBLOCK and TCM/FILEIO for block/blk-lib.c level discard support.
1008 * Note this is not used for TCM/pSCSI passthrough
1011 target_emulate_unmap(struct se_task *task)
1013 struct se_cmd *cmd = task->task_se_cmd;
1014 struct se_device *dev = cmd->se_dev;
1015 unsigned char *buf, *ptr = NULL;
1016 unsigned char *cdb = &cmd->t_task_cdb[0];
1018 unsigned int size = cmd->data_length, range;
1019 int ret = 0, offset;
1020 unsigned short dl, bd_dl;
1022 /* First UNMAP block descriptor starts at 8 byte offset */
1025 dl = get_unaligned_be16(&cdb[0]);
1026 bd_dl = get_unaligned_be16(&cdb[2]);
1028 buf = transport_kmap_first_data_page(cmd);
1031 printk(KERN_INFO "UNMAP: Sub: %s Using dl: %hu bd_dl: %hu size: %hu"
1032 " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr);
1035 lba = get_unaligned_be64(&ptr[0]);
1036 range = get_unaligned_be32(&ptr[8]);
1037 printk(KERN_INFO "UNMAP: Using lba: %llu and range: %u\n",
1038 (unsigned long long)lba, range);
1040 ret = dev->transport->do_discard(dev, lba, range);
1042 printk(KERN_ERR "blkdev_issue_discard() failed: %d\n",
1051 task->task_scsi_status = GOOD;
1052 transport_complete_task(task, 1);
1054 transport_kunmap_first_data_page(cmd);
1060 * Used for TCM/IBLOCK and TCM/FILEIO for block/blk-lib.c level discard support.
1061 * Note this is not used for TCM/pSCSI passthrough
1064 target_emulate_write_same(struct se_task *task, int write_same32)
1066 struct se_cmd *cmd = task->task_se_cmd;
1067 struct se_device *dev = cmd->se_dev;
1069 sector_t lba = cmd->t_task_lba;
1070 unsigned int num_blocks;
1073 * Extract num_blocks from the WRITE_SAME_* CDB. Then use the explict
1074 * range when non zero is supplied, otherwise calculate the remaining
1075 * range based on ->get_blocks() - starting LBA.
1078 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]);
1080 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]);
1082 if (num_blocks != 0)
1085 range = (dev->transport->get_blocks(dev) - lba);
1087 printk(KERN_INFO "WRITE_SAME UNMAP: LBA: %llu Range: %llu\n",
1088 (unsigned long long)lba, (unsigned long long)range);
1090 ret = dev->transport->do_discard(dev, lba, range);
1092 printk(KERN_INFO "blkdev_issue_discard() failed for WRITE_SAME\n");
1096 task->task_scsi_status = GOOD;
1097 transport_complete_task(task, 1);
1102 transport_emulate_control_cdb(struct se_task *task)
1104 struct se_cmd *cmd = task->task_se_cmd;
1105 struct se_device *dev = cmd->se_dev;
1106 unsigned short service_action;
1109 switch (cmd->t_task_cdb[0]) {
1111 ret = target_emulate_inquiry(cmd);
1114 ret = target_emulate_readcapacity(cmd);
1117 ret = target_emulate_modesense(cmd, 0);
1120 ret = target_emulate_modesense(cmd, 1);
1122 case SERVICE_ACTION_IN:
1123 switch (cmd->t_task_cdb[1] & 0x1f) {
1124 case SAI_READ_CAPACITY_16:
1125 ret = target_emulate_readcapacity_16(cmd);
1128 printk(KERN_ERR "Unsupported SA: 0x%02x\n",
1129 cmd->t_task_cdb[1] & 0x1f);
1130 return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
1134 ret = target_emulate_request_sense(cmd);
1137 if (!dev->transport->do_discard) {
1138 printk(KERN_ERR "UNMAP emulation not supported for: %s\n",
1139 dev->transport->name);
1140 return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
1142 ret = target_emulate_unmap(task);
1145 if (!dev->transport->do_discard) {
1146 printk(KERN_ERR "WRITE_SAME_16 emulation not supported"
1147 " for: %s\n", dev->transport->name);
1148 return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
1150 ret = target_emulate_write_same(task, 0);
1152 case VARIABLE_LENGTH_CMD:
1154 get_unaligned_be16(&cmd->t_task_cdb[8]);
1155 switch (service_action) {
1157 if (!dev->transport->do_discard) {
1158 printk(KERN_ERR "WRITE_SAME_32 SA emulation not"
1159 " supported for: %s\n",
1160 dev->transport->name);
1161 return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
1163 ret = target_emulate_write_same(task, 1);
1166 printk(KERN_ERR "Unsupported VARIABLE_LENGTH_CMD SA:"
1167 " 0x%02x\n", service_action);
1171 case SYNCHRONIZE_CACHE:
1172 case 0x91: /* SYNCHRONIZE_CACHE_16: */
1173 if (!dev->transport->do_sync_cache) {
1175 "SYNCHRONIZE_CACHE emulation not supported"
1176 " for: %s\n", dev->transport->name);
1177 return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
1179 dev->transport->do_sync_cache(task);
1181 case ALLOW_MEDIUM_REMOVAL:
1187 case TEST_UNIT_READY:
1189 case WRITE_FILEMARKS:
1192 printk(KERN_ERR "Unsupported SCSI Opcode: 0x%02x for %s\n",
1193 cmd->t_task_cdb[0], dev->transport->name);
1194 return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
1199 task->task_scsi_status = GOOD;
1200 transport_complete_task(task, 1);
1202 return PYX_TRANSPORT_SENT_TO_TRANSPORT;