kevin/linux
1
Fork 0
Code
382436f880
linux/drivers/target/target_core_cdb.c
Roland Dreier 015487b89f target: Untangle front-end and back-end meanings of max_sectors attribute 
se_dev_attrib.max_sectors currently has two independent meanings:

 - It is reported in the block limits VPD page as the maximum transfer
   length, ie the largest IO that the front-end (fabric) can handle.
   Also the target core doesn't enforce this maximum transfer length.

 - It is used to hold the size of the largest IO that the back-end can
   handle, so we know when to split SCSI commands into multiple tasks.

Fix this by adding a new se_dev_attrib.fabric_max_sectors to hold the
maximum transfer length, and checking incoming IOs against that limit.

Signed-off-by: Roland Dreier <roland@purestorage.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2012-02-25 14:37:49 -08:00

1202 lines
33 KiB
C
Raw Blame History

/*
* CDB emulation for non-READ/WRITE commands.
*
* Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
* Copyright (c) 2005, 2006, 2007 SBE, Inc.
* Copyright (c) 2007-2010 Rising Tide Systems
* Copyright (c) 2008-2010 Linux-iSCSI.org
*
* 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 <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_ua.h"
static void
target_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);
}
static int
target_emulate_inquiry_std(struct se_cmd *cmd, 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] = dev->transport->get_device_rev(dev);
/*
* 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
*/
if (dev->se_sub_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED)
target_fill_alua_data(lun->lun_sep, buf);
buf[7] = 0x2; /* CmdQue=1 */
snprintf(&buf[8], 8, "LIO-ORG");
snprintf(&buf[16], 16, "%s", dev->se_sub_dev->t10_wwn.model);
snprintf(&buf[32], 4, "%s", dev->se_sub_dev->t10_wwn.revision);
buf[4] = 31; /* Set additional length to 31 */
return 0;
}
/* unit serial number */
static int
target_emulate_evpd_80(struct se_cmd *cmd, unsigned char *buf)
{
struct se_device *dev = cmd->se_dev;
u16 len = 0;
if (dev->se_sub_dev->su_dev_flags &
SDF_EMULATED_VPD_UNIT_SERIAL) {
u32 unit_serial_len;
unit_serial_len = strlen(dev->se_sub_dev->t10_wwn.unit_serial);
unit_serial_len++; /* For NULL Terminator */
len += sprintf(&buf[4], "%s",
dev->se_sub_dev->t10_wwn.unit_serial);
len++; /* Extra Byte for NULL Terminator */
buf[3] = len;
}
return 0;
}
static void
target_parse_naa_6h_vendor_specific(struct se_device *dev, unsigned char *buf)
{
unsigned char *p = &dev->se_sub_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.
*/
static int
target_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->se_sub_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->se_sub_dev->su_dev_flags & SDF_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
*/
target_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->se_sub_dev->su_dev_flags &
SDF_EMULATED_VPD_UNIT_SERIAL) {
unit_serial_len =
strlen(&dev->se_sub_dev->t10_wwn.unit_serial[0]);
unit_serial_len++; /* For NULL Terminator */
id_len += sprintf(&buf[off+12], "%s:%s", prod,
&dev->se_sub_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
*/
if (dev->se_sub_dev->t10_alua.alua_type !=
SPC3_ALUA_EMULATED)
goto check_scsi_name;
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;
}
/* Extended INQUIRY Data VPD Page */
static int
target_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf)
{
buf[3] = 0x3c;
/* Set HEADSUP, ORDSUP, SIMPSUP */
buf[5] = 0x07;
/* If WriteCache emulation is enabled, set V_SUP */
if (cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0)
buf[6] = 0x01;
return 0;
}
/* Block Limits VPD page */
static int
target_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf)
{
struct se_device *dev = cmd->se_dev;
int have_tp = 0;
/*
* Following sbc3r22 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->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_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 OPTIMAL TRANSFER LENGTH GRANULARITY
*/
put_unaligned_be16(1, &buf[6]);
/*
* Set MAXIMUM TRANSFER LENGTH
*/
put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.fabric_max_sectors, &buf[8]);
/*
* Set OPTIMAL TRANSFER LENGTH
*/
put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.optimal_sectors, &buf[12]);
/*
* Exit now if we don't support TP.
*/
if (!have_tp)
return 0;
/*
* Set MAXIMUM UNMAP LBA COUNT
*/
put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count, &buf[20]);
/*
* Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT
*/
put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count,
&buf[24]);
/*
* Set OPTIMAL UNMAP GRANULARITY
*/
put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.unmap_granularity, &buf[28]);
/*
* UNMAP GRANULARITY ALIGNMENT
*/
put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment,
&buf[32]);
if (dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment != 0)
buf[32] |= 0x80; /* Set the UGAVALID bit */
return 0;
}
/* Block Device Characteristics VPD page */
static int
target_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->se_sub_dev->se_dev_attrib.is_nonrot ? 1 : 0;
return 0;
}
/* Thin Provisioning VPD */
static int
target_emulate_evpd_b2(struct se_cmd *cmd, unsigned char *buf)
{
struct se_device *dev = cmd->se_dev;
/*
* From sbc3r22 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->se_sub_dev->se_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->se_sub_dev->se_dev_attrib.emulate_tpws != 0)
buf[5] |= 0x40;
return 0;
}
static int
target_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf);
static struct {
uint8_t page;
int (*emulate)(struct se_cmd *, unsigned char *);
} evpd_handlers[] = {
{ .page = 0x00, .emulate = target_emulate_evpd_00 },
{ .page = 0x80, .emulate = target_emulate_evpd_80 },
{ .page = 0x83, .emulate = target_emulate_evpd_83 },
{ .page = 0x86, .emulate = target_emulate_evpd_86 },
{ .page = 0xb0, .emulate = target_emulate_evpd_b0 },
{ .page = 0xb1, .emulate = target_emulate_evpd_b1 },
{ .page = 0xb2, .emulate = target_emulate_evpd_b2 },
};
/* supported vital product data pages */
static int
target_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->se_sub_dev->su_dev_flags &
SDF_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;
}
int target_emulate_inquiry(struct se_task *task)
{
struct se_cmd *cmd = task->task_se_cmd;
struct se_device *dev = cmd->se_dev;
struct se_portal_group *tpg = cmd->se_lun->lun_sep->sep_tpg;
unsigned char *buf, *map_buf;
unsigned char *cdb = cmd->t_task_cdb;
int p, ret;
map_buf = transport_kmap_data_sg(cmd);
/*
* If SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC is not set, then we
* know we actually allocated a full page. Otherwise, if the
* data buffer is too small, allocate a temporary buffer so we
* don't have to worry about overruns in all our INQUIRY
* emulation handling.
*/
if (cmd->data_length < SE_INQUIRY_BUF &&
(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)) {
buf = kzalloc(SE_INQUIRY_BUF, GFP_KERNEL);
if (!buf) {
transport_kunmap_data_sg(cmd);
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
return -ENOMEM;
}
} else {
buf = map_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]);
cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
ret = -EINVAL;
goto out;
}
ret = target_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]);
cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
ret = -EINVAL;
out:
if (buf != map_buf) {
memcpy(map_buf, buf, cmd->data_length);
kfree(buf);
}
transport_kunmap_data_sg(cmd);
if (!ret) {
task->task_scsi_status = GOOD;
transport_complete_task(task, 1);
}
return ret;
}
int target_emulate_readcapacity(struct se_task *task)
{
struct se_cmd *cmd = task->task_se_cmd;
struct se_device *dev = cmd->se_dev;
unsigned char *buf;
unsigned long long blocks_long = dev->transport->get_blocks(dev);
u32 blocks;
if (blocks_long >= 0x00000000ffffffff)
blocks = 0xffffffff;
else
blocks = (u32)blocks_long;
buf = transport_kmap_data_sg(cmd);
buf[0] = (blocks >> 24) & 0xff;
buf[1] = (blocks >> 16) & 0xff;
buf[2] = (blocks >> 8) & 0xff;
buf[3] = blocks & 0xff;
buf[4] = (dev->se_sub_dev->se_dev_attrib.block_size >> 24) & 0xff;
buf[5] = (dev->se_sub_dev->se_dev_attrib.block_size >> 16) & 0xff;
buf[6] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff;
buf[7] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff;
/*
* Set max 32-bit blocks to signal SERVICE ACTION READ_CAPACITY_16
*/
if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws)
put_unaligned_be32(0xFFFFFFFF, &buf[0]);
transport_kunmap_data_sg(cmd);
task->task_scsi_status = GOOD;
transport_complete_task(task, 1);
return 0;
}
int target_emulate_readcapacity_16(struct se_task *task)
{
struct se_cmd *cmd = task->task_se_cmd;
struct se_device *dev = cmd->se_dev;
unsigned char *buf;
unsigned long long blocks = dev->transport->get_blocks(dev);
buf = transport_kmap_data_sg(cmd);
buf[0] = (blocks >> 56) & 0xff;
buf[1] = (blocks >> 48) & 0xff;
buf[2] = (blocks >> 40) & 0xff;
buf[3] = (blocks >> 32) & 0xff;
buf[4] = (blocks >> 24) & 0xff;
buf[5] = (blocks >> 16) & 0xff;
buf[6] = (blocks >> 8) & 0xff;
buf[7] = blocks & 0xff;
buf[8] = (dev->se_sub_dev->se_dev_attrib.block_size >> 24) & 0xff;
buf[9] = (dev->se_sub_dev->se_dev_attrib.block_size >> 16) & 0xff;
buf[10] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff;
buf[11] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff;
/*
* Set Thin Provisioning Enable bit following sbc3r22 in section
* READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled.
*/
if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws)
buf[14] = 0x80;
transport_kunmap_data_sg(cmd);
task->task_scsi_status = GOOD;
transport_complete_task(task, 1);
return 0;
}
static int
target_modesense_rwrecovery(unsigned char *p)
{
p[0] = 0x01;
p[1] = 0x0a;
return 12;
}
static int
target_modesense_control(struct se_device *dev, unsigned char *p)
{
p[0] = 0x0a;
p[1] = 0x0a;
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->se_sub_dev->se_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->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2) ? 0x30 :
(dev->se_sub_dev->se_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->se_sub_dev->se_dev_attrib.emulate_tas) ? 0x40 : 0x00;
p[8] = 0xff;
p[9] = 0xff;
p[11] = 30;
return 12;
}
static int
target_modesense_caching(struct se_device *dev, unsigned char *p)
{
p[0] = 0x08;
p[1] = 0x12;
if (dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0)
p[2] = 0x04; /* Write Cache Enable */
p[12] = 0x20; /* Disabled Read Ahead */
return 20;
}
static void
target_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
target_modesense_dpofua(unsigned char *buf, int type)
{
switch (type) {
case TYPE_DISK:
buf[0] |= 0x10; /* DPOFUA bit */
break;
default:
break;
}
}
int target_emulate_modesense(struct se_task *task)
{
struct se_cmd *cmd = task->task_se_cmd;
struct se_device *dev = cmd->se_dev;
char *cdb = cmd->t_task_cdb;
unsigned char *rbuf;
int type = dev->transport->get_device_type(dev);
int ten = (cmd->t_task_cdb[0] == MODE_SENSE_10);
int offset = ten ? 8 : 4;
int length = 0;
unsigned char buf[SE_MODE_PAGE_BUF];
memset(buf, 0, SE_MODE_PAGE_BUF);
switch (cdb[2] & 0x3f) {
case 0x01:
length = target_modesense_rwrecovery(&buf[offset]);
break;
case 0x08:
length = target_modesense_caching(dev, &buf[offset]);
break;
case 0x0a:
length = target_modesense_control(dev, &buf[offset]);
break;
case 0x3f:
length = target_modesense_rwrecovery(&buf[offset]);
length += target_modesense_caching(dev, &buf[offset+length]);
length += target_modesense_control(dev, &buf[offset+length]);
break;
default:
pr_err("MODE SENSE: unimplemented page/subpage: 0x%02x/0x%02x\n",
cdb[2] & 0x3f, cdb[3]);
cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
return -EINVAL;
}
offset += length;
if (ten) {
offset -= 2;
buf[0] = (offset >> 8) & 0xff;
buf[1] = offset & 0xff;
if ((cmd->se_lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) ||
(cmd->se_deve &&
(cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)))
target_modesense_write_protect(&buf[3], type);
if ((dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0) &&
(dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0))
target_modesense_dpofua(&buf[3], type);
if ((offset + 2) > cmd->data_length)
offset = cmd->data_length;
} else {
offset -= 1;
buf[0] = offset & 0xff;
if ((cmd->se_lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) ||
(cmd->se_deve &&
(cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)))
target_modesense_write_protect(&buf[2], type);
if ((dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0) &&
(dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0))
target_modesense_dpofua(&buf[2], type);
if ((offset + 1) > cmd->data_length)
offset = cmd->data_length;
}
rbuf = transport_kmap_data_sg(cmd);
memcpy(rbuf, buf, offset);
transport_kunmap_data_sg(cmd);
task->task_scsi_status = GOOD;
transport_complete_task(task, 1);
return 0;
}
int target_emulate_request_sense(struct se_task *task)
{
struct se_cmd *cmd = task->task_se_cmd;
unsigned char *cdb = cmd->t_task_cdb;
unsigned char *buf;
u8 ua_asc = 0, ua_ascq = 0;
int err = 0;
if (cdb[1] & 0x01) {
pr_err("REQUEST_SENSE description emulation not"
" supported\n");
cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
return -ENOSYS;
}
buf = transport_kmap_data_sg(cmd);
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;
if (cmd->data_length < 18) {
buf[7] = 0x00;
err = -EINVAL;
goto end;
}
/*
* 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;
if (cmd->data_length < 18) {
buf[7] = 0x00;
err = -EINVAL;
goto end;
}
/*
* NO ADDITIONAL SENSE INFORMATION
*/
buf[SPC_ASC_KEY_OFFSET] = 0x00;
buf[7] = 0x0A;
}
end:
transport_kunmap_data_sg(cmd);
task->task_scsi_status = GOOD;
transport_complete_task(task, 1);
return 0;
}
/*
* Used for TCM/IBLOCK and TCM/FILEIO for block/blk-lib.c level discard support.
* Note this is not used for TCM/pSCSI passthrough
*/
int target_emulate_unmap(struct se_task *task)
{
struct se_cmd *cmd = task->task_se_cmd;
struct se_device *dev = cmd->se_dev;
unsigned char *buf, *ptr = NULL;
unsigned char *cdb = &cmd->t_task_cdb[0];
sector_t lba;
unsigned int size = cmd->data_length, range;
int ret = 0, offset;
unsigned short dl, bd_dl;
if (!dev->transport->do_discard) {
pr_err("UNMAP emulation not supported for: %s\n",
dev->transport->name);
cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
return -ENOSYS;
}
/* First UNMAP block descriptor starts at 8 byte offset */
offset = 8;
size -= 8;
dl = get_unaligned_be16(&cdb[0]);
bd_dl = get_unaligned_be16(&cdb[2]);
buf = transport_kmap_data_sg(cmd);
ptr = &buf[offset];
pr_debug("UNMAP: Sub: %s Using dl: %hu bd_dl: %hu size: %hu"
" ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr);
while (size) {
lba = get_unaligned_be64(&ptr[0]);
range = get_unaligned_be32(&ptr[8]);
pr_debug("UNMAP: Using lba: %llu and range: %u\n",
(unsigned long long)lba, range);
ret = dev->transport->do_discard(dev, lba, range);
if (ret < 0) {
pr_err("blkdev_issue_discard() failed: %d\n",
ret);
goto err;
}
ptr += 16;
size -= 16;
}
err:
transport_kunmap_data_sg(cmd);
if (!ret) {
task->task_scsi_status = GOOD;
transport_complete_task(task, 1);
}
return ret;
}
/*
* Used for TCM/IBLOCK and TCM/FILEIO for block/blk-lib.c level discard support.
* Note this is not used for TCM/pSCSI passthrough
*/
int target_emulate_write_same(struct se_task *task)
{
struct se_cmd *cmd = task->task_se_cmd;
struct se_device *dev = cmd->se_dev;
sector_t range;
sector_t lba = cmd->t_task_lba;
u32 num_blocks;
int ret;
if (!dev->transport->do_discard) {
pr_err("WRITE_SAME emulation not supported"
" for: %s\n", dev->transport->name);
cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
return -ENOSYS;
}
if (cmd->t_task_cdb[0] == WRITE_SAME)
num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]);
else if (cmd->t_task_cdb[0] == WRITE_SAME_16)
num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]);
else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */
num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]);
/*
* Use the explicit range when non zero is supplied, otherwise calculate
* the remaining range based on ->get_blocks() - starting LBA.
*/
if (num_blocks != 0)
range = num_blocks;
else
range = (dev->transport->get_blocks(dev) - lba);
pr_debug("WRITE_SAME UNMAP: LBA: %llu Range: %llu\n",
(unsigned long long)lba, (unsigned long long)range);
ret = dev->transport->do_discard(dev, lba, range);
if (ret < 0) {
pr_debug("blkdev_issue_discard() failed for WRITE_SAME\n");
return ret;
}
task->task_scsi_status = GOOD;
transport_complete_task(task, 1);
return 0;
}
int target_emulate_synchronize_cache(struct se_task *task)
{
struct se_device *dev = task->task_se_cmd->se_dev;
struct se_cmd *cmd = task->task_se_cmd;
if (!dev->transport->do_sync_cache) {
pr_err("SYNCHRONIZE_CACHE emulation not supported"
" for: %s\n", dev->transport->name);
cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
return -ENOSYS;
}
dev->transport->do_sync_cache(task);
return 0;
}
int target_emulate_noop(struct se_task *task)
{
task->task_scsi_status = GOOD;
transport_complete_task(task, 1);
return 0;
}
/*
* Write a CDB into @cdb that is based on the one the intiator sent us,
* but updated to only cover the sectors that the current task handles.
*/
void target_get_task_cdb(struct se_task *task, unsigned char *cdb)
{
struct se_cmd *cmd = task->task_se_cmd;
unsigned int cdb_len = scsi_command_size(cmd->t_task_cdb);
memcpy(cdb, cmd->t_task_cdb, cdb_len);
if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
unsigned long long lba = task->task_lba;
u32 sectors = task->task_sectors;
switch (cdb_len) {
case 6:
/* 21-bit LBA and 8-bit sectors */
cdb[1] = (lba >> 16) & 0x1f;
cdb[2] = (lba >> 8) & 0xff;
cdb[3] = lba & 0xff;
cdb[4] = sectors & 0xff;
break;
case 10:
/* 32-bit LBA and 16-bit sectors */
put_unaligned_be32(lba, &cdb[2]);
put_unaligned_be16(sectors, &cdb[7]);
break;
case 12:
/* 32-bit LBA and 32-bit sectors */
put_unaligned_be32(lba, &cdb[2]);
put_unaligned_be32(sectors, &cdb[6]);
break;
case 16:
/* 64-bit LBA and 32-bit sectors */
put_unaligned_be64(lba, &cdb[2]);
put_unaligned_be32(sectors, &cdb[10]);
break;
case 32:
/* 64-bit LBA and 32-bit sectors, extended CDB */
put_unaligned_be64(lba, &cdb[12]);
put_unaligned_be32(sectors, &cdb[28]);
break;
default:
BUG();
}
}
}
EXPORT_SYMBOL(target_get_task_cdb);
View Git Blame Copy Permalink