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;
69 unsigned char *buf = cmd->t_task_buf;
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[0] = dev->transport->get_device_type(dev);
82 if (buf[0] == TYPE_TAPE)
84 buf[2] = dev->transport->get_device_rev(dev);
87 * Enable SCCS and TPGS fields for Emulated ALUA
89 if (dev->se_sub_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED)
90 target_fill_alua_data(lun->lun_sep, buf);
92 if (cmd->data_length < 8) {
93 buf[4] = 1; /* Set additional length to 1 */
97 buf[7] = 0x32; /* Sync=1 and CmdQue=1 */
100 * Do not include vendor, product, reversion info in INQUIRY
101 * response payload for cdbs with a small allocation length.
103 if (cmd->data_length < 36) {
104 buf[4] = 3; /* Set additional length to 3 */
108 snprintf((unsigned char *)&buf[8], 8, "LIO-ORG");
109 snprintf((unsigned char *)&buf[16], 16, "%s",
110 &dev->se_sub_dev->t10_wwn.model[0]);
111 snprintf((unsigned char *)&buf[32], 4, "%s",
112 &dev->se_sub_dev->t10_wwn.revision[0]);
113 buf[4] = 31; /* Set additional length to 31 */
117 /* unit serial number */
119 target_emulate_evpd_80(struct se_cmd *cmd, unsigned char *buf)
121 struct se_device *dev = cmd->se_dev;
124 if (dev->se_sub_dev->su_dev_flags &
125 SDF_EMULATED_VPD_UNIT_SERIAL) {
129 strlen(&dev->se_sub_dev->t10_wwn.unit_serial[0]);
130 unit_serial_len++; /* For NULL Terminator */
132 if (((len + 4) + unit_serial_len) > cmd->data_length) {
133 len += unit_serial_len;
134 buf[2] = ((len >> 8) & 0xff);
135 buf[3] = (len & 0xff);
138 len += sprintf((unsigned char *)&buf[4], "%s",
139 &dev->se_sub_dev->t10_wwn.unit_serial[0]);
140 len++; /* Extra Byte for NULL Terminator */
147 * Device identification VPD, for a complete list of
148 * DESIGNATOR TYPEs see spc4r17 Table 459.
151 target_emulate_evpd_83(struct se_cmd *cmd, unsigned char *buf)
153 struct se_device *dev = cmd->se_dev;
154 struct se_lun *lun = cmd->se_lun;
155 struct se_port *port = NULL;
156 struct se_portal_group *tpg = NULL;
157 struct t10_alua_lu_gp_member *lu_gp_mem;
158 struct t10_alua_tg_pt_gp *tg_pt_gp;
159 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
160 unsigned char binary, binary_new;
161 unsigned char *prod = &dev->se_sub_dev->t10_wwn.model[0];
163 u32 unit_serial_len, off = 0;
170 * NAA IEEE Registered Extended Assigned designator format, see
171 * spc4r17 section 7.7.3.6.5
173 * We depend upon a target_core_mod/ConfigFS provided
174 * /sys/kernel/config/target/core/$HBA/$DEV/wwn/vpd_unit_serial
175 * value in order to return the NAA id.
177 if (!(dev->se_sub_dev->su_dev_flags & SDF_EMULATED_VPD_UNIT_SERIAL))
178 goto check_t10_vend_desc;
180 if (off + 20 > cmd->data_length)
181 goto check_t10_vend_desc;
183 /* CODE SET == Binary */
186 /* Set ASSOICATION == addressed logical unit: 0)b */
189 /* Identifier/Designator type == NAA identifier */
193 /* Identifier/Designator length */
197 * Start NAA IEEE Registered Extended Identifier/Designator
199 buf[off++] = (0x6 << 4);
202 * Use OpenFabrics IEEE Company ID: 00 14 05
206 buf[off] = (0x5 << 4);
209 * Return ConfigFS Unit Serial Number information for
210 * VENDOR_SPECIFIC_IDENTIFIER and
211 * VENDOR_SPECIFIC_IDENTIFIER_EXTENTION
213 binary = transport_asciihex_to_binaryhex(
214 &dev->se_sub_dev->t10_wwn.unit_serial[0]);
215 buf[off++] |= (binary & 0xf0) >> 4;
216 for (i = 0; i < 24; i += 2) {
217 binary_new = transport_asciihex_to_binaryhex(
218 &dev->se_sub_dev->t10_wwn.unit_serial[i+2]);
219 buf[off] = (binary & 0x0f) << 4;
220 buf[off++] |= (binary_new & 0xf0) >> 4;
228 * T10 Vendor Identifier Page, see spc4r17 section 7.7.3.4
230 id_len = 8; /* For Vendor field */
231 prod_len = 4; /* For VPD Header */
232 prod_len += 8; /* For Vendor field */
233 prod_len += strlen(prod);
234 prod_len++; /* For : */
236 if (dev->se_sub_dev->su_dev_flags &
237 SDF_EMULATED_VPD_UNIT_SERIAL) {
239 strlen(&dev->se_sub_dev->t10_wwn.unit_serial[0]);
240 unit_serial_len++; /* For NULL Terminator */
242 if ((len + (id_len + 4) +
243 (prod_len + unit_serial_len)) >
245 len += (prod_len + unit_serial_len);
248 id_len += sprintf((unsigned char *)&buf[off+12],
250 &dev->se_sub_dev->t10_wwn.unit_serial[0]);
252 buf[off] = 0x2; /* ASCII */
253 buf[off+1] = 0x1; /* T10 Vendor ID */
255 memcpy((unsigned char *)&buf[off+4], "LIO-ORG", 8);
256 /* Extra Byte for NULL Terminator */
258 /* Identifier Length */
260 /* Header size for Designation descriptor */
264 * struct se_port is only set for INQUIRY VPD=1 through $FABRIC_MOD
269 struct t10_alua_lu_gp *lu_gp;
270 u32 padding, scsi_name_len;
277 * Relative target port identifer, see spc4r17
280 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
281 * section 7.5.1 Table 362
283 if (((len + 4) + 8) > cmd->data_length) {
288 (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
289 buf[off++] |= 0x1; /* CODE SET == Binary */
290 buf[off] = 0x80; /* Set PIV=1 */
291 /* Set ASSOICATION == target port: 01b */
293 /* DESIGNATOR TYPE == Relative target port identifer */
295 off++; /* Skip over Reserved */
296 buf[off++] = 4; /* DESIGNATOR LENGTH */
297 /* Skip over Obsolete field in RTPI payload
300 buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
301 buf[off++] = (port->sep_rtpi & 0xff);
302 len += 8; /* Header size + Designation descriptor */
304 * Target port group identifier, see spc4r17
307 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
308 * section 7.5.1 Table 362
311 if (dev->se_sub_dev->t10_alua.alua_type !=
313 goto check_scsi_name;
315 if (((len + 4) + 8) > cmd->data_length) {
319 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
323 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
324 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
326 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
329 tg_pt_gp_id = tg_pt_gp->tg_pt_gp_id;
330 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
333 (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
334 buf[off++] |= 0x1; /* CODE SET == Binary */
335 buf[off] = 0x80; /* Set PIV=1 */
336 /* Set ASSOICATION == target port: 01b */
338 /* DESIGNATOR TYPE == Target port group identifier */
340 off++; /* Skip over Reserved */
341 buf[off++] = 4; /* DESIGNATOR LENGTH */
342 off += 2; /* Skip over Reserved Field */
343 buf[off++] = ((tg_pt_gp_id >> 8) & 0xff);
344 buf[off++] = (tg_pt_gp_id & 0xff);
345 len += 8; /* Header size + Designation descriptor */
347 * Logical Unit Group identifier, see spc4r17
351 if (((len + 4) + 8) > cmd->data_length) {
353 goto check_scsi_name;
355 lu_gp_mem = dev->dev_alua_lu_gp_mem;
357 goto check_scsi_name;
359 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
360 lu_gp = lu_gp_mem->lu_gp;
362 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
363 goto check_scsi_name;
365 lu_gp_id = lu_gp->lu_gp_id;
366 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
368 buf[off++] |= 0x1; /* CODE SET == Binary */
369 /* DESIGNATOR TYPE == Logical Unit Group identifier */
371 off++; /* Skip over Reserved */
372 buf[off++] = 4; /* DESIGNATOR LENGTH */
373 off += 2; /* Skip over Reserved Field */
374 buf[off++] = ((lu_gp_id >> 8) & 0xff);
375 buf[off++] = (lu_gp_id & 0xff);
376 len += 8; /* Header size + Designation descriptor */
378 * SCSI name string designator, see spc4r17
381 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
382 * section 7.5.1 Table 362
385 scsi_name_len = strlen(tpg->se_tpg_tfo->tpg_get_wwn(tpg));
386 /* UTF-8 ",t,0x<16-bit TPGT>" + NULL Terminator */
388 /* Check for 4-byte padding */
389 padding = ((-scsi_name_len) & 3);
391 scsi_name_len += padding;
392 /* Header size + Designation descriptor */
395 if (((len + 4) + scsi_name_len) > cmd->data_length) {
396 len += scsi_name_len;
400 (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
401 buf[off++] |= 0x3; /* CODE SET == UTF-8 */
402 buf[off] = 0x80; /* Set PIV=1 */
403 /* Set ASSOICATION == target port: 01b */
405 /* DESIGNATOR TYPE == SCSI name string */
407 off += 2; /* Skip over Reserved and length */
409 * SCSI name string identifer containing, $FABRIC_MOD
410 * dependent information. For LIO-Target and iSCSI
411 * Target Port, this means "<iSCSI name>,t,0x<TPGT> in
414 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
415 scsi_name_len = sprintf(&buf[off], "%s,t,0x%04x",
416 tpg->se_tpg_tfo->tpg_get_wwn(tpg), tpgt);
417 scsi_name_len += 1 /* Include NULL terminator */;
419 * The null-terminated, null-padded (see 4.4.2) SCSI
420 * NAME STRING field contains a UTF-8 format string.
421 * The number of bytes in the SCSI NAME STRING field
422 * (i.e., the value in the DESIGNATOR LENGTH field)
423 * shall be no larger than 256 and shall be a multiple
427 scsi_name_len += padding;
429 buf[off-1] = scsi_name_len;
430 off += scsi_name_len;
431 /* Header size + Designation descriptor */
432 len += (scsi_name_len + 4);
435 buf[2] = ((len >> 8) & 0xff);
436 buf[3] = (len & 0xff); /* Page Length for VPD 0x83 */
440 /* Extended INQUIRY Data VPD Page */
442 target_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf)
444 if (cmd->data_length < 60)
448 /* Set HEADSUP, ORDSUP, SIMPSUP */
451 /* If WriteCache emulation is enabled, set V_SUP */
452 if (cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0)
457 /* Block Limits VPD page */
459 target_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf)
461 struct se_device *dev = cmd->se_dev;
465 * Following sbc3r22 section 6.5.3 Block Limits VPD page, when
466 * emulate_tpu=1 or emulate_tpws=1 we will be expect a
467 * different page length for Thin Provisioning.
469 if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws)
472 if (cmd->data_length < (0x10 + 4)) {
473 printk(KERN_INFO "Received data_length: %u"
474 " too small for EVPD 0xb0\n",
479 if (have_tp && cmd->data_length < (0x3c + 4)) {
480 printk(KERN_INFO "Received data_length: %u"
481 " too small for TPE=1 EVPD 0xb0\n",
486 buf[0] = dev->transport->get_device_type(dev);
487 buf[3] = have_tp ? 0x3c : 0x10;
490 * Set OPTIMAL TRANSFER LENGTH GRANULARITY
492 put_unaligned_be16(1, &buf[6]);
495 * Set MAXIMUM TRANSFER LENGTH
497 put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.max_sectors, &buf[8]);
500 * Set OPTIMAL TRANSFER LENGTH
502 put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.optimal_sectors, &buf[12]);
505 * Exit now if we don't support TP or the initiator sent a too
508 if (!have_tp || cmd->data_length < (0x3c + 4))
512 * Set MAXIMUM UNMAP LBA COUNT
514 put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count, &buf[20]);
517 * Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT
519 put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count,
523 * Set OPTIMAL UNMAP GRANULARITY
525 put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.unmap_granularity, &buf[28]);
528 * UNMAP GRANULARITY ALIGNMENT
530 put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment,
532 if (dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment != 0)
533 buf[32] |= 0x80; /* Set the UGAVALID bit */
538 /* Block Device Characteristics VPD page */
540 target_emulate_evpd_b1(struct se_cmd *cmd, unsigned char *buf)
542 struct se_device *dev = cmd->se_dev;
544 buf[0] = dev->transport->get_device_type(dev);
547 if (cmd->data_length >= 5 &&
548 dev->se_sub_dev->se_dev_attrib.is_nonrot)
554 /* Thin Provisioning VPD */
556 target_emulate_evpd_b2(struct se_cmd *cmd, unsigned char *buf)
558 struct se_device *dev = cmd->se_dev;
561 * From sbc3r22 section 6.5.4 Thin Provisioning VPD page:
563 * The PAGE LENGTH field is defined in SPC-4. If the DP bit is set to
564 * zero, then the page length shall be set to 0004h. If the DP bit
565 * is set to one, then the page length shall be set to the value
566 * defined in table 162.
568 buf[0] = dev->transport->get_device_type(dev);
571 * Set Hardcoded length mentioned above for DP=0
573 put_unaligned_be16(0x0004, &buf[2]);
576 * The THRESHOLD EXPONENT field indicates the threshold set size in
577 * LBAs as a power of 2 (i.e., the threshold set size is equal to
578 * 2(threshold exponent)).
580 * Note that this is currently set to 0x00 as mkp says it will be
581 * changing again. We can enable this once it has settled in T10
582 * and is actually used by Linux/SCSI ML code.
587 * A TPU bit set to one indicates that the device server supports
588 * the UNMAP command (see 5.25). A TPU bit set to zero indicates
589 * that the device server does not support the UNMAP command.
591 if (dev->se_sub_dev->se_dev_attrib.emulate_tpu != 0)
595 * A TPWS bit set to one indicates that the device server supports
596 * the use of the WRITE SAME (16) command (see 5.42) to unmap LBAs.
597 * A TPWS bit set to zero indicates that the device server does not
598 * support the use of the WRITE SAME (16) command to unmap LBAs.
600 if (dev->se_sub_dev->se_dev_attrib.emulate_tpws != 0)
607 target_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf);
611 int (*emulate)(struct se_cmd *, unsigned char *);
612 } evpd_handlers[] = {
613 { .page = 0x00, .emulate = target_emulate_evpd_00 },
614 { .page = 0x80, .emulate = target_emulate_evpd_80 },
615 { .page = 0x83, .emulate = target_emulate_evpd_83 },
616 { .page = 0x86, .emulate = target_emulate_evpd_86 },
617 { .page = 0xb0, .emulate = target_emulate_evpd_b0 },
618 { .page = 0xb1, .emulate = target_emulate_evpd_b1 },
619 { .page = 0xb2, .emulate = target_emulate_evpd_b2 },
622 /* supported vital product data pages */
624 target_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf)
628 if (cmd->data_length < 8)
631 * Only report the INQUIRY EVPD=1 pages after a valid NAA
632 * Registered Extended LUN WWN has been set via ConfigFS
633 * during device creation/restart.
635 if (cmd->se_dev->se_sub_dev->su_dev_flags &
636 SDF_EMULATED_VPD_UNIT_SERIAL) {
637 buf[3] = ARRAY_SIZE(evpd_handlers);
638 for (p = 0; p < min_t(int, ARRAY_SIZE(evpd_handlers),
639 cmd->data_length - 4); ++p)
640 buf[p + 4] = evpd_handlers[p].page;
647 target_emulate_inquiry(struct se_cmd *cmd)
649 struct se_device *dev = cmd->se_dev;
650 unsigned char *buf = cmd->t_task_buf;
651 unsigned char *cdb = cmd->t_task_cdb;
655 return target_emulate_inquiry_std(cmd);
658 * Make sure we at least have 4 bytes of INQUIRY response
659 * payload for 0x00 going back for EVPD=1. Note that 0x80
660 * and 0x83 will check for enough payload data length and
661 * jump to set_len: label when there is not enough inquiry EVPD
662 * payload length left for the next outgoing EVPD metadata
664 if (cmd->data_length < 4) {
665 printk(KERN_ERR "SCSI Inquiry payload length: %u"
666 " too small for EVPD=1\n", cmd->data_length);
669 buf[0] = dev->transport->get_device_type(dev);
671 for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p)
672 if (cdb[2] == evpd_handlers[p].page) {
674 return evpd_handlers[p].emulate(cmd, buf);
677 printk(KERN_ERR "Unknown VPD Code: 0x%02x\n", cdb[2]);
682 target_emulate_readcapacity(struct se_cmd *cmd)
684 struct se_device *dev = cmd->se_dev;
685 unsigned char *buf = cmd->t_task_buf;
686 unsigned long long blocks_long = dev->transport->get_blocks(dev);
689 if (blocks_long >= 0x00000000ffffffff)
692 blocks = (u32)blocks_long;
694 buf[0] = (blocks >> 24) & 0xff;
695 buf[1] = (blocks >> 16) & 0xff;
696 buf[2] = (blocks >> 8) & 0xff;
697 buf[3] = blocks & 0xff;
698 buf[4] = (dev->se_sub_dev->se_dev_attrib.block_size >> 24) & 0xff;
699 buf[5] = (dev->se_sub_dev->se_dev_attrib.block_size >> 16) & 0xff;
700 buf[6] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff;
701 buf[7] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff;
703 * Set max 32-bit blocks to signal SERVICE ACTION READ_CAPACITY_16
705 if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws)
706 put_unaligned_be32(0xFFFFFFFF, &buf[0]);
712 target_emulate_readcapacity_16(struct se_cmd *cmd)
714 struct se_device *dev = cmd->se_dev;
715 unsigned char *buf = cmd->t_task_buf;
716 unsigned long long blocks = dev->transport->get_blocks(dev);
718 buf[0] = (blocks >> 56) & 0xff;
719 buf[1] = (blocks >> 48) & 0xff;
720 buf[2] = (blocks >> 40) & 0xff;
721 buf[3] = (blocks >> 32) & 0xff;
722 buf[4] = (blocks >> 24) & 0xff;
723 buf[5] = (blocks >> 16) & 0xff;
724 buf[6] = (blocks >> 8) & 0xff;
725 buf[7] = blocks & 0xff;
726 buf[8] = (dev->se_sub_dev->se_dev_attrib.block_size >> 24) & 0xff;
727 buf[9] = (dev->se_sub_dev->se_dev_attrib.block_size >> 16) & 0xff;
728 buf[10] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff;
729 buf[11] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff;
731 * Set Thin Provisioning Enable bit following sbc3r22 in section
732 * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled.
734 if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws)
741 target_modesense_rwrecovery(unsigned char *p)
750 target_modesense_control(struct se_device *dev, unsigned char *p)
756 * From spc4r17, section 7.4.6 Control mode Page
758 * Unit Attention interlocks control (UN_INTLCK_CTRL) to code 00b
760 * 00b: The logical unit shall clear any unit attention condition
761 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
762 * status and shall not establish a unit attention condition when a com-
763 * mand is completed with BUSY, TASK SET FULL, or RESERVATION CONFLICT
766 * 10b: The logical unit shall not clear any unit attention condition
767 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
768 * status and shall not establish a unit attention condition when
769 * a command is completed with BUSY, TASK SET FULL, or RESERVATION
772 * 11b a The logical unit shall not clear any unit attention condition
773 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
774 * status and shall establish a unit attention condition for the
775 * initiator port associated with the I_T nexus on which the BUSY,
776 * TASK SET FULL, or RESERVATION CONFLICT status is being returned.
777 * Depending on the status, the additional sense code shall be set to
778 * PREVIOUS BUSY STATUS, PREVIOUS TASK SET FULL STATUS, or PREVIOUS
779 * RESERVATION CONFLICT STATUS. Until it is cleared by a REQUEST SENSE
780 * command, a unit attention condition shall be established only once
781 * for a BUSY, TASK SET FULL, or RESERVATION CONFLICT status regardless
782 * to the number of commands completed with one of those status codes.
784 p[4] = (dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2) ? 0x30 :
785 (dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 1) ? 0x20 : 0x00;
787 * From spc4r17, section 7.4.6 Control mode Page
789 * Task Aborted Status (TAS) bit set to zero.
791 * A task aborted status (TAS) bit set to zero specifies that aborted
792 * tasks shall be terminated by the device server without any response
793 * to the application client. A TAS bit set to one specifies that tasks
794 * aborted by the actions of an I_T nexus other than the I_T nexus on
795 * which the command was received shall be completed with TASK ABORTED
796 * status (see SAM-4).
798 p[5] = (dev->se_sub_dev->se_dev_attrib.emulate_tas) ? 0x40 : 0x00;
807 target_modesense_caching(struct se_device *dev, unsigned char *p)
811 if (dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0)
812 p[2] = 0x04; /* Write Cache Enable */
813 p[12] = 0x20; /* Disabled Read Ahead */
819 target_modesense_write_protect(unsigned char *buf, int type)
822 * I believe that the WP bit (bit 7) in the mode header is the same for
829 buf[0] |= 0x80; /* WP bit */
835 target_modesense_dpofua(unsigned char *buf, int type)
839 buf[0] |= 0x10; /* DPOFUA bit */
847 target_emulate_modesense(struct se_cmd *cmd, int ten)
849 struct se_device *dev = cmd->se_dev;
850 char *cdb = cmd->t_task_cdb;
851 unsigned char *rbuf = cmd->t_task_buf;
852 int type = dev->transport->get_device_type(dev);
853 int offset = (ten) ? 8 : 4;
855 unsigned char buf[SE_MODE_PAGE_BUF];
857 memset(buf, 0, SE_MODE_PAGE_BUF);
859 switch (cdb[2] & 0x3f) {
861 length = target_modesense_rwrecovery(&buf[offset]);
864 length = target_modesense_caching(dev, &buf[offset]);
867 length = target_modesense_control(dev, &buf[offset]);
870 length = target_modesense_rwrecovery(&buf[offset]);
871 length += target_modesense_caching(dev, &buf[offset+length]);
872 length += target_modesense_control(dev, &buf[offset+length]);
875 printk(KERN_ERR "Got Unknown Mode Page: 0x%02x\n",
877 return PYX_TRANSPORT_UNKNOWN_MODE_PAGE;
883 buf[0] = (offset >> 8) & 0xff;
884 buf[1] = offset & 0xff;
886 if ((cmd->se_lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) ||
888 (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)))
889 target_modesense_write_protect(&buf[3], type);
891 if ((dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0) &&
892 (dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0))
893 target_modesense_dpofua(&buf[3], type);
895 if ((offset + 2) > cmd->data_length)
896 offset = cmd->data_length;
900 buf[0] = offset & 0xff;
902 if ((cmd->se_lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) ||
904 (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)))
905 target_modesense_write_protect(&buf[2], type);
907 if ((dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0) &&
908 (dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0))
909 target_modesense_dpofua(&buf[2], type);
911 if ((offset + 1) > cmd->data_length)
912 offset = cmd->data_length;
914 memcpy(rbuf, buf, offset);
920 target_emulate_request_sense(struct se_cmd *cmd)
922 unsigned char *cdb = cmd->t_task_cdb;
923 unsigned char *buf = cmd->t_task_buf;
924 u8 ua_asc = 0, ua_ascq = 0;
927 printk(KERN_ERR "REQUEST_SENSE description emulation not"
929 return PYX_TRANSPORT_INVALID_CDB_FIELD;
931 if (!(core_scsi3_ua_clear_for_request_sense(cmd, &ua_asc, &ua_ascq))) {
933 * CURRENT ERROR, UNIT ATTENTION
936 buf[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
938 * Make sure request data length is enough for additional
941 if (cmd->data_length <= 18) {
946 * The Additional Sense Code (ASC) from the UNIT ATTENTION
948 buf[SPC_ASC_KEY_OFFSET] = ua_asc;
949 buf[SPC_ASCQ_KEY_OFFSET] = ua_ascq;
953 * CURRENT ERROR, NO SENSE
956 buf[SPC_SENSE_KEY_OFFSET] = NO_SENSE;
958 * Make sure request data length is enough for additional
961 if (cmd->data_length <= 18) {
966 * NO ADDITIONAL SENSE INFORMATION
968 buf[SPC_ASC_KEY_OFFSET] = 0x00;
976 * Used for TCM/IBLOCK and TCM/FILEIO for block/blk-lib.c level discard support.
977 * Note this is not used for TCM/pSCSI passthrough
980 target_emulate_unmap(struct se_task *task)
982 struct se_cmd *cmd = task->task_se_cmd;
983 struct se_device *dev = cmd->se_dev;
984 unsigned char *buf = cmd->t_task_buf, *ptr = NULL;
985 unsigned char *cdb = &cmd->t_task_cdb[0];
987 unsigned int size = cmd->data_length, range;
989 unsigned short dl, bd_dl;
991 /* First UNMAP block descriptor starts at 8 byte offset */
994 dl = get_unaligned_be16(&cdb[0]);
995 bd_dl = get_unaligned_be16(&cdb[2]);
997 printk(KERN_INFO "UNMAP: Sub: %s Using dl: %hu bd_dl: %hu size: %hu"
998 " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr);
1001 lba = get_unaligned_be64(&ptr[0]);
1002 range = get_unaligned_be32(&ptr[8]);
1003 printk(KERN_INFO "UNMAP: Using lba: %llu and range: %u\n",
1004 (unsigned long long)lba, range);
1006 ret = dev->transport->do_discard(dev, lba, range);
1008 printk(KERN_ERR "blkdev_issue_discard() failed: %d\n",
1017 task->task_scsi_status = GOOD;
1018 transport_complete_task(task, 1);
1023 * Used for TCM/IBLOCK and TCM/FILEIO for block/blk-lib.c level discard support.
1024 * Note this is not used for TCM/pSCSI passthrough
1027 target_emulate_write_same(struct se_task *task, int write_same32)
1029 struct se_cmd *cmd = task->task_se_cmd;
1030 struct se_device *dev = cmd->se_dev;
1032 sector_t lba = cmd->t_task_lba;
1033 unsigned int num_blocks;
1036 * Extract num_blocks from the WRITE_SAME_* CDB. Then use the explict
1037 * range when non zero is supplied, otherwise calculate the remaining
1038 * range based on ->get_blocks() - starting LBA.
1041 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]);
1043 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]);
1045 if (num_blocks != 0)
1048 range = (dev->transport->get_blocks(dev) - lba);
1050 printk(KERN_INFO "WRITE_SAME UNMAP: LBA: %llu Range: %llu\n",
1051 (unsigned long long)lba, (unsigned long long)range);
1053 ret = dev->transport->do_discard(dev, lba, range);
1055 printk(KERN_INFO "blkdev_issue_discard() failed for WRITE_SAME\n");
1059 task->task_scsi_status = GOOD;
1060 transport_complete_task(task, 1);
1065 transport_emulate_control_cdb(struct se_task *task)
1067 struct se_cmd *cmd = task->task_se_cmd;
1068 struct se_device *dev = cmd->se_dev;
1069 unsigned short service_action;
1072 switch (cmd->t_task_cdb[0]) {
1074 ret = target_emulate_inquiry(cmd);
1077 ret = target_emulate_readcapacity(cmd);
1080 ret = target_emulate_modesense(cmd, 0);
1083 ret = target_emulate_modesense(cmd, 1);
1085 case SERVICE_ACTION_IN:
1086 switch (cmd->t_task_cdb[1] & 0x1f) {
1087 case SAI_READ_CAPACITY_16:
1088 ret = target_emulate_readcapacity_16(cmd);
1091 printk(KERN_ERR "Unsupported SA: 0x%02x\n",
1092 cmd->t_task_cdb[1] & 0x1f);
1093 return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
1097 ret = target_emulate_request_sense(cmd);
1100 if (!dev->transport->do_discard) {
1101 printk(KERN_ERR "UNMAP emulation not supported for: %s\n",
1102 dev->transport->name);
1103 return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
1105 ret = target_emulate_unmap(task);
1108 if (!dev->transport->do_discard) {
1109 printk(KERN_ERR "WRITE_SAME_16 emulation not supported"
1110 " for: %s\n", dev->transport->name);
1111 return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
1113 ret = target_emulate_write_same(task, 0);
1115 case VARIABLE_LENGTH_CMD:
1117 get_unaligned_be16(&cmd->t_task_cdb[8]);
1118 switch (service_action) {
1120 if (!dev->transport->do_discard) {
1121 printk(KERN_ERR "WRITE_SAME_32 SA emulation not"
1122 " supported for: %s\n",
1123 dev->transport->name);
1124 return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
1126 ret = target_emulate_write_same(task, 1);
1129 printk(KERN_ERR "Unsupported VARIABLE_LENGTH_CMD SA:"
1130 " 0x%02x\n", service_action);
1134 case SYNCHRONIZE_CACHE:
1135 case 0x91: /* SYNCHRONIZE_CACHE_16: */
1136 if (!dev->transport->do_sync_cache) {
1138 "SYNCHRONIZE_CACHE emulation not supported"
1139 " for: %s\n", dev->transport->name);
1140 return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
1142 dev->transport->do_sync_cache(task);
1144 case ALLOW_MEDIUM_REMOVAL:
1150 case TEST_UNIT_READY:
1152 case WRITE_FILEMARKS:
1155 printk(KERN_ERR "Unsupported SCSI Opcode: 0x%02x for %s\n",
1156 cmd->t_task_cdb[0], dev->transport->name);
1157 return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
1162 task->task_scsi_status = GOOD;
1163 transport_complete_task(task, 1);
1165 return PYX_TRANSPORT_SENT_TO_TRANSPORT;