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linux/drivers/target/target_core_spc.c

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/*
* SCSI Primary Commands (SPC) parsing and emulation.
*
* (c) Copyright 2002-2013 Datera, Inc.
*
* Nicholas A. Bellinger <nab@kernel.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <asm/unaligned.h>
#include <scsi/scsi.h>
#include <scsi/scsi_tcq.h>
#include <target/target_core_base.h>
#include <target/target_core_backend.h>
#include <target/target_core_fabric.h>
#include "target_core_internal.h"
#include "target_core_alua.h"
#include "target_core_pr.h"
#include "target_core_ua.h"
#include "target_core_xcopy.h"
static void spc_fill_alua_data(struct se_port *port, unsigned char *buf)
{
struct t10_alua_tg_pt_gp *tg_pt_gp;
struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
/*
* Set SCCS for MAINTENANCE_IN + REPORT_TARGET_PORT_GROUPS.
*/
buf[5] = 0x80;
/*
* Set TPGS field for explict and/or implict ALUA access type
* and opteration.
*
* See spc4r17 section 6.4.2 Table 135
*/
if (!port)
return;
tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
if (!tg_pt_gp_mem)
return;
spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
if (tg_pt_gp)
buf[5] |= tg_pt_gp->tg_pt_gp_alua_access_type;
spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
}
sense_reason_t
spc_emulate_inquiry_std(struct se_cmd *cmd, unsigned char *buf)
{
struct se_lun *lun = cmd->se_lun;
struct se_device *dev = cmd->se_dev;
/* Set RMB (removable media) for tape devices */
if (dev->transport->get_device_type(dev) == TYPE_TAPE)
buf[1] = 0x80;
buf[2] = 0x05; /* SPC-3 */
/*
* NORMACA and HISUP = 0, RESPONSE DATA FORMAT = 2
*
* SPC4 says:
* A RESPONSE DATA FORMAT field set to 2h indicates that the
* standard INQUIRY data is in the format defined in this
* standard. Response data format values less than 2h are
* obsolete. Response data format values greater than 2h are
* reserved.
*/
buf[3] = 2;
/*
* Enable SCCS and TPGS fields for Emulated ALUA
*/
spc_fill_alua_data(lun->lun_sep, buf);
/*
* Set Third-Party Copy (3PC) bit to indicate support for EXTENDED_COPY
*/
if (dev->dev_attrib.emulate_3pc)
buf[5] |= 0x8;
buf[7] = 0x2; /* CmdQue=1 */
memcpy(&buf[8], "LIO-ORG ", 8);
memset(&buf[16], 0x20, 16);
memcpy(&buf[16], dev->t10_wwn.model,
min_t(size_t, strlen(dev->t10_wwn.model), 16));
memcpy(&buf[32], dev->t10_wwn.revision,
min_t(size_t, strlen(dev->t10_wwn.revision), 4));
buf[4] = 31; /* Set additional length to 31 */
return 0;
}
EXPORT_SYMBOL(spc_emulate_inquiry_std);
/* unit serial number */
static sense_reason_t
spc_emulate_evpd_80(struct se_cmd *cmd, unsigned char *buf)
{
struct se_device *dev = cmd->se_dev;
u16 len = 0;
if (dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) {
u32 unit_serial_len;
unit_serial_len = strlen(dev->t10_wwn.unit_serial);
unit_serial_len++; /* For NULL Terminator */
len += sprintf(&buf[4], "%s", dev->t10_wwn.unit_serial);
len++; /* Extra Byte for NULL Terminator */
buf[3] = len;
}
return 0;
}
void spc_parse_naa_6h_vendor_specific(struct se_device *dev,
unsigned char *buf)
{
unsigned char *p = &dev->t10_wwn.unit_serial[0];
int cnt;
bool next = true;
/*
* Generate up to 36 bits of VENDOR SPECIFIC IDENTIFIER starting on
* byte 3 bit 3-0 for NAA IEEE Registered Extended DESIGNATOR field
* format, followed by 64 bits of VENDOR SPECIFIC IDENTIFIER EXTENSION
* to complete the payload. These are based from VPD=0x80 PRODUCT SERIAL
* NUMBER set via vpd_unit_serial in target_core_configfs.c to ensure
* per device uniqeness.
*/
for (cnt = 0; *p && cnt < 13; p++) {
int val = hex_to_bin(*p);
if (val < 0)
continue;
if (next) {
next = false;
buf[cnt++] |= val;
} else {
next = true;
buf[cnt] = val << 4;
}
}
}
/*
* Device identification VPD, for a complete list of
* DESIGNATOR TYPEs see spc4r17 Table 459.
*/
sense_reason_t
spc_emulate_evpd_83(struct se_cmd *cmd, unsigned char *buf)
{
struct se_device *dev = cmd->se_dev;
struct se_lun *lun = cmd->se_lun;
struct se_port *port = NULL;
struct se_portal_group *tpg = NULL;
struct t10_alua_lu_gp_member *lu_gp_mem;
struct t10_alua_tg_pt_gp *tg_pt_gp;
struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
unsigned char *prod = &dev->t10_wwn.model[0];
u32 prod_len;
u32 unit_serial_len, off = 0;
u16 len = 0, id_len;
off = 4;
/*
* NAA IEEE Registered Extended Assigned designator format, see
* spc4r17 section 7.7.3.6.5
*
* We depend upon a target_core_mod/ConfigFS provided
* /sys/kernel/config/target/core/$HBA/$DEV/wwn/vpd_unit_serial
* value in order to return the NAA id.
*/
if (!(dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL))
goto check_t10_vend_desc;
/* CODE SET == Binary */
buf[off++] = 0x1;
/* Set ASSOCIATION == addressed logical unit: 0)b */
buf[off] = 0x00;
/* Identifier/Designator type == NAA identifier */
buf[off++] |= 0x3;
off++;
/* Identifier/Designator length */
buf[off++] = 0x10;
/*
* Start NAA IEEE Registered Extended Identifier/Designator
*/
buf[off++] = (0x6 << 4);
/*
* Use OpenFabrics IEEE Company ID: 00 14 05
*/
buf[off++] = 0x01;
buf[off++] = 0x40;
buf[off] = (0x5 << 4);
/*
* Return ConfigFS Unit Serial Number information for
* VENDOR_SPECIFIC_IDENTIFIER and
* VENDOR_SPECIFIC_IDENTIFIER_EXTENTION
*/
spc_parse_naa_6h_vendor_specific(dev, &buf[off]);
len = 20;
off = (len + 4);
check_t10_vend_desc:
/*
* T10 Vendor Identifier Page, see spc4r17 section 7.7.3.4
*/
id_len = 8; /* For Vendor field */
prod_len = 4; /* For VPD Header */
prod_len += 8; /* For Vendor field */
prod_len += strlen(prod);
prod_len++; /* For : */
if (dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) {
unit_serial_len = strlen(&dev->t10_wwn.unit_serial[0]);
unit_serial_len++; /* For NULL Terminator */
id_len += sprintf(&buf[off+12], "%s:%s", prod,
&dev->t10_wwn.unit_serial[0]);
}
buf[off] = 0x2; /* ASCII */
buf[off+1] = 0x1; /* T10 Vendor ID */
buf[off+2] = 0x0;
memcpy(&buf[off+4], "LIO-ORG", 8);
/* Extra Byte for NULL Terminator */
id_len++;
/* Identifier Length */
buf[off+3] = id_len;
/* Header size for Designation descriptor */
len += (id_len + 4);
off += (id_len + 4);
/*
* struct se_port is only set for INQUIRY VPD=1 through $FABRIC_MOD
*/
port = lun->lun_sep;
if (port) {
struct t10_alua_lu_gp *lu_gp;
u32 padding, scsi_name_len;
u16 lu_gp_id = 0;
u16 tg_pt_gp_id = 0;
u16 tpgt;
tpg = port->sep_tpg;
/*
* Relative target port identifer, see spc4r17
* section 7.7.3.7
*
* Get the PROTOCOL IDENTIFIER as defined by spc4r17
* section 7.5.1 Table 362
*/
buf[off] =
(tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
buf[off++] |= 0x1; /* CODE SET == Binary */
buf[off] = 0x80; /* Set PIV=1 */
/* Set ASSOCIATION == target port: 01b */
buf[off] |= 0x10;
/* DESIGNATOR TYPE == Relative target port identifer */
buf[off++] |= 0x4;
off++; /* Skip over Reserved */
buf[off++] = 4; /* DESIGNATOR LENGTH */
/* Skip over Obsolete field in RTPI payload
* in Table 472 */
off += 2;
buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
buf[off++] = (port->sep_rtpi & 0xff);
len += 8; /* Header size + Designation descriptor */
/*
* Target port group identifier, see spc4r17
* section 7.7.3.8
*
* Get the PROTOCOL IDENTIFIER as defined by spc4r17
* section 7.5.1 Table 362
*/
tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
if (!tg_pt_gp_mem)
goto check_lu_gp;
spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
if (!tg_pt_gp) {
spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
goto check_lu_gp;
}
tg_pt_gp_id = tg_pt_gp->tg_pt_gp_id;
spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
buf[off] =
(tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
buf[off++] |= 0x1; /* CODE SET == Binary */
buf[off] = 0x80; /* Set PIV=1 */
/* Set ASSOCIATION == target port: 01b */
buf[off] |= 0x10;
/* DESIGNATOR TYPE == Target port group identifier */
buf[off++] |= 0x5;
off++; /* Skip over Reserved */
buf[off++] = 4; /* DESIGNATOR LENGTH */
off += 2; /* Skip over Reserved Field */
buf[off++] = ((tg_pt_gp_id >> 8) & 0xff);
buf[off++] = (tg_pt_gp_id & 0xff);
len += 8; /* Header size + Designation descriptor */
/*
* Logical Unit Group identifier, see spc4r17
* section 7.7.3.8
*/
check_lu_gp:
lu_gp_mem = dev->dev_alua_lu_gp_mem;
if (!lu_gp_mem)
goto check_scsi_name;
spin_lock(&lu_gp_mem->lu_gp_mem_lock);
lu_gp = lu_gp_mem->lu_gp;
if (!lu_gp) {
spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
goto check_scsi_name;
}
lu_gp_id = lu_gp->lu_gp_id;
spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
buf[off++] |= 0x1; /* CODE SET == Binary */
/* DESIGNATOR TYPE == Logical Unit Group identifier */
buf[off++] |= 0x6;
off++; /* Skip over Reserved */
buf[off++] = 4; /* DESIGNATOR LENGTH */
off += 2; /* Skip over Reserved Field */
buf[off++] = ((lu_gp_id >> 8) & 0xff);
buf[off++] = (lu_gp_id & 0xff);
len += 8; /* Header size + Designation descriptor */
/*
* SCSI name string designator, see spc4r17
* section 7.7.3.11
*
* Get the PROTOCOL IDENTIFIER as defined by spc4r17
* section 7.5.1 Table 362
*/
check_scsi_name:
scsi_name_len = strlen(tpg->se_tpg_tfo->tpg_get_wwn(tpg));
/* UTF-8 ",t,0x<16-bit TPGT>" + NULL Terminator */
scsi_name_len += 10;
/* Check for 4-byte padding */
padding = ((-scsi_name_len) & 3);
if (padding != 0)
scsi_name_len += padding;
/* Header size + Designation descriptor */
scsi_name_len += 4;
buf[off] =
(tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
buf[off++] |= 0x3; /* CODE SET == UTF-8 */
buf[off] = 0x80; /* Set PIV=1 */
/* Set ASSOCIATION == target port: 01b */
buf[off] |= 0x10;
/* DESIGNATOR TYPE == SCSI name string */
buf[off++] |= 0x8;
off += 2; /* Skip over Reserved and length */
/*
* SCSI name string identifer containing, $FABRIC_MOD
* dependent information. For LIO-Target and iSCSI
* Target Port, this means "<iSCSI name>,t,0x<TPGT> in
* UTF-8 encoding.
*/
tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
scsi_name_len = sprintf(&buf[off], "%s,t,0x%04x",
tpg->se_tpg_tfo->tpg_get_wwn(tpg), tpgt);
scsi_name_len += 1 /* Include NULL terminator */;
/*
* The null-terminated, null-padded (see 4.4.2) SCSI
* NAME STRING field contains a UTF-8 format string.
* The number of bytes in the SCSI NAME STRING field
* (i.e., the value in the DESIGNATOR LENGTH field)
* shall be no larger than 256 and shall be a multiple
* of four.
*/
if (padding)
scsi_name_len += padding;
buf[off-1] = scsi_name_len;
off += scsi_name_len;
/* Header size + Designation descriptor */
len += (scsi_name_len + 4);
}
buf[2] = ((len >> 8) & 0xff);
buf[3] = (len & 0xff); /* Page Length for VPD 0x83 */
return 0;
}
EXPORT_SYMBOL(spc_emulate_evpd_83);
static bool
spc_check_dev_wce(struct se_device *dev)
{
bool wce = false;
if (dev->transport->get_write_cache)
wce = dev->transport->get_write_cache(dev);
else if (dev->dev_attrib.emulate_write_cache > 0)
wce = true;
return wce;
}
/* Extended INQUIRY Data VPD Page */
static sense_reason_t
spc_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf)
{
struct se_device *dev = cmd->se_dev;
buf[3] = 0x3c;
/* Set HEADSUP, ORDSUP, SIMPSUP */
buf[5] = 0x07;
/* If WriteCache emulation is enabled, set V_SUP */
if (spc_check_dev_wce(dev))
buf[6] = 0x01;
return 0;
}
/* Block Limits VPD page */
static sense_reason_t
spc_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf)
{
struct se_device *dev = cmd->se_dev;
u32 max_sectors;
int have_tp = 0;
int opt, min;
/*
* Following spc3r22 section 6.5.3 Block Limits VPD page, when
* emulate_tpu=1 or emulate_tpws=1 we will be expect a
* different page length for Thin Provisioning.
*/
if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws)
have_tp = 1;
buf[0] = dev->transport->get_device_type(dev);
buf[3] = have_tp ? 0x3c : 0x10;
/* Set WSNZ to 1 */
buf[4] = 0x01;
/*
* Set MAXIMUM COMPARE AND WRITE LENGTH
*/
if (dev->dev_attrib.emulate_caw)
buf[5] = 0x01;
/*
* Set OPTIMAL TRANSFER LENGTH GRANULARITY
*/
if (dev->transport->get_io_min && (min = dev->transport->get_io_min(dev)))
put_unaligned_be16(min / dev->dev_attrib.block_size, &buf[6]);
else
put_unaligned_be16(1, &buf[6]);
/*
* Set MAXIMUM TRANSFER LENGTH
*/
max_sectors = min(dev->dev_attrib.fabric_max_sectors,
dev->dev_attrib.hw_max_sectors);
put_unaligned_be32(max_sectors, &buf[8]);
/*
* Set OPTIMAL TRANSFER LENGTH
*/
if (dev->transport->get_io_opt && (opt = dev->transport->get_io_opt(dev)))
put_unaligned_be32(opt / dev->dev_attrib.block_size, &buf[12]);
else
put_unaligned_be32(dev->dev_attrib.optimal_sectors, &buf[12]);
/*
* Exit now if we don't support TP.
*/
if (!have_tp)
goto max_write_same;
/*
* Set MAXIMUM UNMAP LBA COUNT
*/
put_unaligned_be32(dev->dev_attrib.max_unmap_lba_count, &buf[20]);
/*
* Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT
*/
put_unaligned_be32(dev->dev_attrib.max_unmap_block_desc_count,
&buf[24]);
/*
* Set OPTIMAL UNMAP GRANULARITY
*/
put_unaligned_be32(dev->dev_attrib.unmap_granularity, &buf[28]);
/*
* UNMAP GRANULARITY ALIGNMENT
*/
put_unaligned_be32(dev->dev_attrib.unmap_granularity_alignment,
&buf[32]);
if (dev->dev_attrib.unmap_granularity_alignment != 0)
buf[32] |= 0x80; /* Set the UGAVALID bit */
/*
* MAXIMUM WRITE SAME LENGTH
*/
max_write_same:
put_unaligned_be64(dev->dev_attrib.max_write_same_len, &buf[36]);
return 0;
}
/* Block Device Characteristics VPD page */
static sense_reason_t
spc_emulate_evpd_b1(struct se_cmd *cmd, unsigned char *buf)
{
struct se_device *dev = cmd->se_dev;
buf[0] = dev->transport->get_device_type(dev);
buf[3] = 0x3c;
buf[5] = dev->dev_attrib.is_nonrot ? 1 : 0;
return 0;
}
/* Thin Provisioning VPD */
static sense_reason_t
spc_emulate_evpd_b2(struct se_cmd *cmd, unsigned char *buf)
{
struct se_device *dev = cmd->se_dev;
/*
* From spc3r22 section 6.5.4 Thin Provisioning VPD page:
*
* The PAGE LENGTH field is defined in SPC-4. If the DP bit is set to
* zero, then the page length shall be set to 0004h. If the DP bit
* is set to one, then the page length shall be set to the value
* defined in table 162.
*/
buf[0] = dev->transport->get_device_type(dev);
/*
* Set Hardcoded length mentioned above for DP=0
*/
put_unaligned_be16(0x0004, &buf[2]);
/*
* The THRESHOLD EXPONENT field indicates the threshold set size in
* LBAs as a power of 2 (i.e., the threshold set size is equal to
* 2(threshold exponent)).
*
* Note that this is currently set to 0x00 as mkp says it will be
* changing again. We can enable this once it has settled in T10
* and is actually used by Linux/SCSI ML code.
*/
buf[4] = 0x00;
/*
* A TPU bit set to one indicates that the device server supports
* the UNMAP command (see 5.25). A TPU bit set to zero indicates
* that the device server does not support the UNMAP command.
*/
if (dev->dev_attrib.emulate_tpu != 0)
buf[5] = 0x80;
/*
* A TPWS bit set to one indicates that the device server supports
* the use of the WRITE SAME (16) command (see 5.42) to unmap LBAs.
* A TPWS bit set to zero indicates that the device server does not
* support the use of the WRITE SAME (16) command to unmap LBAs.
*/
if (dev->dev_attrib.emulate_tpws != 0)
buf[5] |= 0x40;
return 0;
}
static sense_reason_t
spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf);
static struct {
uint8_t page;
sense_reason_t (*emulate)(struct se_cmd *, unsigned char *);
} evpd_handlers[] = {
{ .page = 0x00, .emulate = spc_emulate_evpd_00 },
{ .page = 0x80, .emulate = spc_emulate_evpd_80 },
{ .page = 0x83, .emulate = spc_emulate_evpd_83 },
{ .page = 0x86, .emulate = spc_emulate_evpd_86 },
{ .page = 0xb0, .emulate = spc_emulate_evpd_b0 },
{ .page = 0xb1, .emulate = spc_emulate_evpd_b1 },
{ .page = 0xb2, .emulate = spc_emulate_evpd_b2 },
};
/* supported vital product data pages */
static sense_reason_t
spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf)
{
int p;
/*
* Only report the INQUIRY EVPD=1 pages after a valid NAA
* Registered Extended LUN WWN has been set via ConfigFS
* during device creation/restart.
*/
if (cmd->se_dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) {
buf[3] = ARRAY_SIZE(evpd_handlers);
for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p)
buf[p + 4] = evpd_handlers[p].page;
}
return 0;
}
static sense_reason_t
spc_emulate_inquiry(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
struct se_portal_group *tpg = cmd->se_lun->lun_sep->sep_tpg;
unsigned char *rbuf;
unsigned char *cdb = cmd->t_task_cdb;
unsigned char buf[SE_INQUIRY_BUF];
sense_reason_t ret;
int p;
memset(buf, 0, SE_INQUIRY_BUF);
if (dev == tpg->tpg_virt_lun0.lun_se_dev)
buf[0] = 0x3f; /* Not connected */
else
buf[0] = dev->transport->get_device_type(dev);
if (!(cdb[1] & 0x1)) {
if (cdb[2]) {
pr_err("INQUIRY with EVPD==0 but PAGE CODE=%02x\n",
cdb[2]);
ret = TCM_INVALID_CDB_FIELD;
goto out;
}
ret = spc_emulate_inquiry_std(cmd, buf);
goto out;
}
for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p) {
if (cdb[2] == evpd_handlers[p].page) {
buf[1] = cdb[2];
ret = evpd_handlers[p].emulate(cmd, buf);
goto out;
}
}
pr_err("Unknown VPD Code: 0x%02x\n", cdb[2]);
ret = TCM_INVALID_CDB_FIELD;
out:
rbuf = transport_kmap_data_sg(cmd);
if (rbuf) {
memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
transport_kunmap_data_sg(cmd);
}
if (!ret)
target_complete_cmd(cmd, GOOD);
return ret;
}
static int spc_modesense_rwrecovery(struct se_device *dev, u8 pc, u8 *p)
{
p[0] = 0x01;
p[1] = 0x0a;
/* No changeable values for now */
if (pc == 1)
goto out;
out:
return 12;
}
static int spc_modesense_control(struct se_device *dev, u8 pc, u8 *p)
{
p[0] = 0x0a;
p[1] = 0x0a;
/* No changeable values for now */
if (pc == 1)
goto out;
p[2] = 2;
/*
* From spc4r23, 7.4.7 Control mode page
*
* The QUEUE ALGORITHM MODIFIER field (see table 368) specifies
* restrictions on the algorithm used for reordering commands
* having the SIMPLE task attribute (see SAM-4).
*
* Table 368 -- QUEUE ALGORITHM MODIFIER field
* Code Description
* 0h Restricted reordering
* 1h Unrestricted reordering allowed
* 2h to 7h Reserved
* 8h to Fh Vendor specific
*
* A value of zero in the QUEUE ALGORITHM MODIFIER field specifies that
* the device server shall order the processing sequence of commands
* having the SIMPLE task attribute such that data integrity is maintained
* for that I_T nexus (i.e., if the transmission of new SCSI transport protocol
* requests is halted at any time, the final value of all data observable
* on the medium shall be the same as if all the commands had been processed
* with the ORDERED task attribute).
*
* A value of one in the QUEUE ALGORITHM MODIFIER field specifies that the
* device server may reorder the processing sequence of commands having the
* SIMPLE task attribute in any manner. Any data integrity exposures related to
* command sequence order shall be explicitly handled by the application client
* through the selection of appropriate ommands and task attributes.
*/
p[3] = (dev->dev_attrib.emulate_rest_reord == 1) ? 0x00 : 0x10;
/*
* From spc4r17, section 7.4.6 Control mode Page
*
* Unit Attention interlocks control (UN_INTLCK_CTRL) to code 00b
*
* 00b: The logical unit shall clear any unit attention condition
* reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
* status and shall not establish a unit attention condition when a com-
* mand is completed with BUSY, TASK SET FULL, or RESERVATION CONFLICT
* status.
*
* 10b: The logical unit shall not clear any unit attention condition
* reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
* status and shall not establish a unit attention condition when
* a command is completed with BUSY, TASK SET FULL, or RESERVATION
* CONFLICT status.
*
* 11b a The logical unit shall not clear any unit attention condition
* reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
* status and shall establish a unit attention condition for the
* initiator port associated with the I_T nexus on which the BUSY,
* TASK SET FULL, or RESERVATION CONFLICT status is being returned.
* Depending on the status, the additional sense code shall be set to
* PREVIOUS BUSY STATUS, PREVIOUS TASK SET FULL STATUS, or PREVIOUS
* RESERVATION CONFLICT STATUS. Until it is cleared by a REQUEST SENSE
* command, a unit attention condition shall be established only once
* for a BUSY, TASK SET FULL, or RESERVATION CONFLICT status regardless
* to the number of commands completed with one of those status codes.
*/
p[4] = (dev->dev_attrib.emulate_ua_intlck_ctrl == 2) ? 0x30 :
(dev->dev_attrib.emulate_ua_intlck_ctrl == 1) ? 0x20 : 0x00;
/*
* From spc4r17, section 7.4.6 Control mode Page
*
* Task Aborted Status (TAS) bit set to zero.
*
* A task aborted status (TAS) bit set to zero specifies that aborted
* tasks shall be terminated by the device server without any response
* to the application client. A TAS bit set to one specifies that tasks
* aborted by the actions of an I_T nexus other than the I_T nexus on
* which the command was received shall be completed with TASK ABORTED
* status (see SAM-4).
*/
p[5] = (dev->dev_attrib.emulate_tas) ? 0x40 : 0x00;
p[8] = 0xff;
p[9] = 0xff;
p[11] = 30;
out:
return 12;
}
static int spc_modesense_caching(struct se_device *dev, u8 pc, u8 *p)
{
p[0] = 0x08;
p[1] = 0x12;
/* No changeable values for now */
if (pc == 1)
goto out;
if (spc_check_dev_wce(dev))
p[2] = 0x04; /* Write Cache Enable */
p[12] = 0x20; /* Disabled Read Ahead */
out:
return 20;
}
static int spc_modesense_informational_exceptions(struct se_device *dev, u8 pc, unsigned char *p)
{
p[0] = 0x1c;
p[1] = 0x0a;
/* No changeable values for now */
if (pc == 1)
goto out;
out:
return 12;
}
static struct {
uint8_t page;
uint8_t subpage;
int (*emulate)(struct se_device *, u8, unsigned char *);
} modesense_handlers[] = {
{ .page = 0x01, .subpage = 0x00, .emulate = spc_modesense_rwrecovery },
{ .page = 0x08, .subpage = 0x00, .emulate = spc_modesense_caching },
{ .page = 0x0a, .subpage = 0x00, .emulate = spc_modesense_control },
{ .page = 0x1c, .subpage = 0x00, .emulate = spc_modesense_informational_exceptions },
};
static void spc_modesense_write_protect(unsigned char *buf, int type)
{
/*
* I believe that the WP bit (bit 7) in the mode header is the same for
* all device types..
*/
switch (type) {
case TYPE_DISK:
case TYPE_TAPE:
default:
buf[0] |= 0x80; /* WP bit */
break;
}
}
static void spc_modesense_dpofua(unsigned char *buf, int type)
{
switch (type) {
case TYPE_DISK:
buf[0] |= 0x10; /* DPOFUA bit */
break;
default:
break;
}
}
static int spc_modesense_blockdesc(unsigned char *buf, u64 blocks, u32 block_size)
{
*buf++ = 8;
put_unaligned_be32(min(blocks, 0xffffffffull), buf);
buf += 4;
put_unaligned_be32(block_size, buf);
return 9;
}
static int spc_modesense_long_blockdesc(unsigned char *buf, u64 blocks, u32 block_size)
{
if (blocks <= 0xffffffff)
return spc_modesense_blockdesc(buf + 3, blocks, block_size) + 3;
*buf++ = 1; /* LONGLBA */
buf += 2;
*buf++ = 16;
put_unaligned_be64(blocks, buf);
buf += 12;
put_unaligned_be32(block_size, buf);
return 17;
}
static sense_reason_t spc_emulate_modesense(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
char *cdb = cmd->t_task_cdb;
unsigned char buf[SE_MODE_PAGE_BUF], *rbuf;
int type = dev->transport->get_device_type(dev);
int ten = (cmd->t_task_cdb[0] == MODE_SENSE_10);
bool dbd = !!(cdb[1] & 0x08);
bool llba = ten ? !!(cdb[1] & 0x10) : false;
u8 pc = cdb[2] >> 6;
u8 page = cdb[2] & 0x3f;
u8 subpage = cdb[3];
int length = 0;
int ret;
int i;
memset(buf, 0, SE_MODE_PAGE_BUF);
/*
* Skip over MODE DATA LENGTH + MEDIUM TYPE fields to byte 3 for
* MODE_SENSE_10 and byte 2 for MODE_SENSE (6).
*/
length = ten ? 3 : 2;
/* DEVICE-SPECIFIC PARAMETER */
if ((cmd->se_lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) ||
(cmd->se_deve &&
(cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)))
spc_modesense_write_protect(&buf[length], type);
if ((spc_check_dev_wce(dev)) &&
(dev->dev_attrib.emulate_fua_write > 0))
spc_modesense_dpofua(&buf[length], type);
++length;
/* BLOCK DESCRIPTOR */
/*
* For now we only include a block descriptor for disk (SBC)
* devices; other command sets use a slightly different format.
*/
if (!dbd && type == TYPE_DISK) {
u64 blocks = dev->transport->get_blocks(dev);
u32 block_size = dev->dev_attrib.block_size;
if (ten) {
if (llba) {
length += spc_modesense_long_blockdesc(&buf[length],
blocks, block_size);
} else {
length += 3;
length += spc_modesense_blockdesc(&buf[length],
blocks, block_size);
}
} else {
length += spc_modesense_blockdesc(&buf[length], blocks,
block_size);
}
} else {
if (ten)
length += 4;
else
length += 1;
}
if (page == 0x3f) {
if (subpage != 0x00 && subpage != 0xff) {
pr_warn("MODE_SENSE: Invalid subpage code: 0x%02x\n", subpage);
return TCM_INVALID_CDB_FIELD;
}
for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i) {
/*
* Tricky way to say all subpage 00h for
* subpage==0, all subpages for subpage==0xff
* (and we just checked above that those are
* the only two possibilities).
*/
if ((modesense_handlers[i].subpage & ~subpage) == 0) {
ret = modesense_handlers[i].emulate(dev, pc, &buf[length]);
if (!ten && length + ret >= 255)
break;
length += ret;
}
}
goto set_length;
}
for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i)
if (modesense_handlers[i].page == page &&
modesense_handlers[i].subpage == subpage) {
length += modesense_handlers[i].emulate(dev, pc, &buf[length]);
goto set_length;
}
/*
* We don't intend to implement:
* - obsolete page 03h "format parameters" (checked by Solaris)
*/
if (page != 0x03)
pr_err("MODE SENSE: unimplemented page/subpage: 0x%02x/0x%02x\n",
page, subpage);
return TCM_UNKNOWN_MODE_PAGE;
set_length:
if (ten)
put_unaligned_be16(length - 2, buf);
else
buf[0] = length - 1;
rbuf = transport_kmap_data_sg(cmd);
if (rbuf) {
memcpy(rbuf, buf, min_t(u32, SE_MODE_PAGE_BUF, cmd->data_length));
transport_kunmap_data_sg(cmd);
}
target_complete_cmd(cmd, GOOD);
return 0;
}
static sense_reason_t spc_emulate_modeselect(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
char *cdb = cmd->t_task_cdb;
bool ten = cdb[0] == MODE_SELECT_10;
int off = ten ? 8 : 4;
bool pf = !!(cdb[1] & 0x10);
u8 page, subpage;
unsigned char *buf;
unsigned char tbuf[SE_MODE_PAGE_BUF];
int length;
int ret = 0;
int i;
if (!cmd->data_length) {
target_complete_cmd(cmd, GOOD);
return 0;
}
if (cmd->data_length < off + 2)
return TCM_PARAMETER_LIST_LENGTH_ERROR;
buf = transport_kmap_data_sg(cmd);
if (!buf)
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
if (!pf) {
ret = TCM_INVALID_CDB_FIELD;
goto out;
}
page = buf[off] & 0x3f;
subpage = buf[off] & 0x40 ? buf[off + 1] : 0;
for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i)
if (modesense_handlers[i].page == page &&
modesense_handlers[i].subpage == subpage) {
memset(tbuf, 0, SE_MODE_PAGE_BUF);
length = modesense_handlers[i].emulate(dev, 0, tbuf);
goto check_contents;
}
ret = TCM_UNKNOWN_MODE_PAGE;
goto out;
check_contents:
if (cmd->data_length < off + length) {
ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
goto out;
}
if (memcmp(buf + off, tbuf, length))
ret = TCM_INVALID_PARAMETER_LIST;
out:
transport_kunmap_data_sg(cmd);
if (!ret)
target_complete_cmd(cmd, GOOD);
return ret;
}
static sense_reason_t spc_emulate_request_sense(struct se_cmd *cmd)
{
unsigned char *cdb = cmd->t_task_cdb;
unsigned char *rbuf;
u8 ua_asc = 0, ua_ascq = 0;
unsigned char buf[SE_SENSE_BUF];
memset(buf, 0, SE_SENSE_BUF);
if (cdb[1] & 0x01) {
pr_err("REQUEST_SENSE description emulation not"
" supported\n");
return TCM_INVALID_CDB_FIELD;
}
rbuf = transport_kmap_data_sg(cmd);
if (!rbuf)
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
if (!core_scsi3_ua_clear_for_request_sense(cmd, &ua_asc, &ua_ascq)) {
/*
* CURRENT ERROR, UNIT ATTENTION
*/
buf[0] = 0x70;
buf[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
/*
* The Additional Sense Code (ASC) from the UNIT ATTENTION
*/
buf[SPC_ASC_KEY_OFFSET] = ua_asc;
buf[SPC_ASCQ_KEY_OFFSET] = ua_ascq;
buf[7] = 0x0A;
} else {
/*
* CURRENT ERROR, NO SENSE
*/
buf[0] = 0x70;
buf[SPC_SENSE_KEY_OFFSET] = NO_SENSE;
/*
* NO ADDITIONAL SENSE INFORMATION
*/
buf[SPC_ASC_KEY_OFFSET] = 0x00;
buf[7] = 0x0A;
}
memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
transport_kunmap_data_sg(cmd);
target_complete_cmd(cmd, GOOD);
return 0;
}
sense_reason_t spc_emulate_report_luns(struct se_cmd *cmd)
{
struct se_dev_entry *deve;
struct se_session *sess = cmd->se_sess;
unsigned char *buf;
u32 lun_count = 0, offset = 8, i;
if (cmd->data_length < 16) {
pr_warn("REPORT LUNS allocation length %u too small\n",
cmd->data_length);
return TCM_INVALID_CDB_FIELD;
}
buf = transport_kmap_data_sg(cmd);
if (!buf)
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
/*
* If no struct se_session pointer is present, this struct se_cmd is
* coming via a target_core_mod PASSTHROUGH op, and not through
* a $FABRIC_MOD. In that case, report LUN=0 only.
*/
if (!sess) {
int_to_scsilun(0, (struct scsi_lun *)&buf[offset]);
lun_count = 1;
goto done;
}
spin_lock_irq(&sess->se_node_acl->device_list_lock);
for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
deve = sess->se_node_acl->device_list[i];
if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
continue;
/*
* We determine the correct LUN LIST LENGTH even once we
* have reached the initial allocation length.
* See SPC2-R20 7.19.
*/
lun_count++;
if ((offset + 8) > cmd->data_length)
continue;
int_to_scsilun(deve->mapped_lun, (struct scsi_lun *)&buf[offset]);
offset += 8;
}
spin_unlock_irq(&sess->se_node_acl->device_list_lock);
/*
* See SPC3 r07, page 159.
*/
done:
lun_count *= 8;
buf[0] = ((lun_count >> 24) & 0xff);
buf[1] = ((lun_count >> 16) & 0xff);
buf[2] = ((lun_count >> 8) & 0xff);
buf[3] = (lun_count & 0xff);
transport_kunmap_data_sg(cmd);
target_complete_cmd(cmd, GOOD);
return 0;
}
EXPORT_SYMBOL(spc_emulate_report_luns);
static sense_reason_t
spc_emulate_testunitready(struct se_cmd *cmd)
{
target_complete_cmd(cmd, GOOD);
return 0;
}
sense_reason_t
spc_parse_cdb(struct se_cmd *cmd, unsigned int *size)
{
struct se_device *dev = cmd->se_dev;
unsigned char *cdb = cmd->t_task_cdb;
switch (cdb[0]) {
case MODE_SELECT:
*size = cdb[4];
cmd->execute_cmd = spc_emulate_modeselect;
break;
case MODE_SELECT_10:
*size = (cdb[7] << 8) + cdb[8];
cmd->execute_cmd = spc_emulate_modeselect;
break;
case MODE_SENSE:
*size = cdb[4];
cmd->execute_cmd = spc_emulate_modesense;
break;
case MODE_SENSE_10:
*size = (cdb[7] << 8) + cdb[8];
cmd->execute_cmd = spc_emulate_modesense;
break;
case LOG_SELECT:
case LOG_SENSE:
*size = (cdb[7] << 8) + cdb[8];
break;
case PERSISTENT_RESERVE_IN:
*size = (cdb[7] << 8) + cdb[8];
cmd->execute_cmd = target_scsi3_emulate_pr_in;
break;
case PERSISTENT_RESERVE_OUT:
*size = (cdb[7] << 8) + cdb[8];
cmd->execute_cmd = target_scsi3_emulate_pr_out;
break;
case RELEASE:
case RELEASE_10:
if (cdb[0] == RELEASE_10)
*size = (cdb[7] << 8) | cdb[8];
else
*size = cmd->data_length;
cmd->execute_cmd = target_scsi2_reservation_release;
break;
case RESERVE:
case RESERVE_10:
/*
* The SPC-2 RESERVE does not contain a size in the SCSI CDB.
* Assume the passthrough or $FABRIC_MOD will tell us about it.
*/
if (cdb[0] == RESERVE_10)
*size = (cdb[7] << 8) | cdb[8];
else
*size = cmd->data_length;
cmd->execute_cmd = target_scsi2_reservation_reserve;
break;
case REQUEST_SENSE:
*size = cdb[4];
cmd->execute_cmd = spc_emulate_request_sense;
break;
case INQUIRY:
*size = (cdb[3] << 8) + cdb[4];
/*
* Do implict HEAD_OF_QUEUE processing for INQUIRY.
* See spc4r17 section 5.3
*/
cmd->sam_task_attr = MSG_HEAD_TAG;
cmd->execute_cmd = spc_emulate_inquiry;
break;
case SECURITY_PROTOCOL_IN:
case SECURITY_PROTOCOL_OUT:
*size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
break;
case EXTENDED_COPY:
*size = get_unaligned_be32(&cdb[10]);
cmd->execute_cmd = target_do_xcopy;
break;
case RECEIVE_COPY_RESULTS:
*size = get_unaligned_be32(&cdb[10]);
cmd->execute_cmd = target_do_receive_copy_results;
break;
case READ_ATTRIBUTE:
case WRITE_ATTRIBUTE:
*size = (cdb[10] << 24) | (cdb[11] << 16) |
(cdb[12] << 8) | cdb[13];
break;
case RECEIVE_DIAGNOSTIC:
case SEND_DIAGNOSTIC:
*size = (cdb[3] << 8) | cdb[4];
break;
case WRITE_BUFFER:
*size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
break;
case REPORT_LUNS:
cmd->execute_cmd = spc_emulate_report_luns;
*size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
/*
* Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
* See spc4r17 section 5.3
*/
cmd->sam_task_attr = MSG_HEAD_TAG;
break;
case TEST_UNIT_READY:
cmd->execute_cmd = spc_emulate_testunitready;
*size = 0;
break;
case MAINTENANCE_IN:
if (dev->transport->get_device_type(dev) != TYPE_ROM) {
/*
* MAINTENANCE_IN from SCC-2
* Check for emulated MI_REPORT_TARGET_PGS
*/
if ((cdb[1] & 0x1f) == MI_REPORT_TARGET_PGS) {
cmd->execute_cmd =
target_emulate_report_target_port_groups;
}
*size = get_unaligned_be32(&cdb[6]);
} else {
/*
* GPCMD_SEND_KEY from multi media commands
*/
*size = get_unaligned_be16(&cdb[8]);
}
break;
case MAINTENANCE_OUT:
if (dev->transport->get_device_type(dev) != TYPE_ROM) {
/*
* MAINTENANCE_OUT from SCC-2
* Check for emulated MO_SET_TARGET_PGS.
*/
if (cdb[1] == MO_SET_TARGET_PGS) {
cmd->execute_cmd =
target_emulate_set_target_port_groups;
}
*size = get_unaligned_be32(&cdb[6]);
} else {
/*
* GPCMD_SEND_KEY from multi media commands
*/
*size = get_unaligned_be16(&cdb[8]);
}
break;
default:
pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
" 0x%02x, sending CHECK_CONDITION.\n",
cmd->se_tfo->get_fabric_name(), cdb[0]);
return TCM_UNSUPPORTED_SCSI_OPCODE;
}
return 0;
}
EXPORT_SYMBOL(spc_parse_cdb);
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