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authorChristoph Hellwig <hch@infradead.org>2012-05-20 11:59:14 -0400
committerNicholas Bellinger <nab@linux-iscsi.org>2012-06-12 21:38:30 -0700
commit366e815ef199da797cab52566016e692442b5c60 (patch)
tree9cec3aeeb2659f29f5e2ec4a9e3604c4193cc718
parent9dac90988a2a8683530064b2fe7c941e736cb95f (diff)
downloadlinux-366e815ef199da797cab52566016e692442b5c60.zip
linux-366e815ef199da797cab52566016e692442b5c60.tar.gz
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target: add a parse_cdb method to the backend drivers
Instead of trying to handle all SCSI command sets in one function (transport_generic_cmd_sequencer) call out to the backend driver to perform this functionality. For pSCSI a copy of the existing code is used, but for all virtual backends we can use a new parse_sbc_cdb helper is used to provide a simple SBC emulation. For now this setups means a fair amount of duplication between pSCSI and the SBC library, but patches later in this series will sort out that problem. (nab: Fix up build failure in target_core_pscsi.c) Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
-rw-r--r--drivers/target/Makefile1
-rw-r--r--drivers/target/target_core_file.c1
-rw-r--r--drivers/target/target_core_iblock.c1
-rw-r--r--drivers/target/target_core_internal.h3
-rw-r--r--drivers/target/target_core_pscsi.c470
-rw-r--r--drivers/target/target_core_rd.c1
-rw-r--r--drivers/target/target_core_sbc.c450
-rw-r--r--drivers/target/target_core_spc.c1
-rw-r--r--drivers/target/target_core_transport.c736
-rw-r--r--include/target/target_core_backend.h5
10 files changed, 936 insertions, 733 deletions
diff --git a/drivers/target/Makefile b/drivers/target/Makefile
index 70cab2a..50b887b 100644
--- a/drivers/target/Makefile
+++ b/drivers/target/Makefile
@@ -10,6 +10,7 @@ target_core_mod-y := target_core_configfs.o \
target_core_tpg.o \
target_core_transport.o \
target_core_cdb.o \
+ target_core_sbc.o \
target_core_spc.o \
target_core_ua.o \
target_core_rd.o \
diff --git a/drivers/target/target_core_file.c b/drivers/target/target_core_file.c
index 9f99d04..e2df308 100644
--- a/drivers/target/target_core_file.c
+++ b/drivers/target/target_core_file.c
@@ -561,6 +561,7 @@ static struct se_subsystem_api fileio_template = {
.allocate_virtdevice = fd_allocate_virtdevice,
.create_virtdevice = fd_create_virtdevice,
.free_device = fd_free_device,
+ .parse_cdb = sbc_parse_cdb,
.execute_cmd = fd_execute_cmd,
.do_sync_cache = fd_emulate_sync_cache,
.check_configfs_dev_params = fd_check_configfs_dev_params,
diff --git a/drivers/target/target_core_iblock.c b/drivers/target/target_core_iblock.c
index fd47950..244fff4 100644
--- a/drivers/target/target_core_iblock.c
+++ b/drivers/target/target_core_iblock.c
@@ -653,6 +653,7 @@ static struct se_subsystem_api iblock_template = {
.allocate_virtdevice = iblock_allocate_virtdevice,
.create_virtdevice = iblock_create_virtdevice,
.free_device = iblock_free_device,
+ .parse_cdb = sbc_parse_cdb,
.execute_cmd = iblock_execute_cmd,
.do_discard = iblock_do_discard,
.do_sync_cache = iblock_emulate_sync_cache,
diff --git a/drivers/target/target_core_internal.h b/drivers/target/target_core_internal.h
index 6bbf18d..165e824 100644
--- a/drivers/target/target_core_internal.h
+++ b/drivers/target/target_core_internal.h
@@ -96,9 +96,6 @@ int core_tpg_post_addlun(struct se_portal_group *, struct se_lun *,
struct se_lun *core_tpg_pre_dellun(struct se_portal_group *, u32 unpacked_lun);
int core_tpg_post_dellun(struct se_portal_group *, struct se_lun *);
-/* target_core_spc.c */
-int spc_parse_cdb(struct se_cmd *cmd, unsigned int *size, bool passthrough);
-
/* target_core_transport.c */
extern struct kmem_cache *se_tmr_req_cache;
diff --git a/drivers/target/target_core_pscsi.c b/drivers/target/target_core_pscsi.c
index bfc7232..378da24 100644
--- a/drivers/target/target_core_pscsi.c
+++ b/drivers/target/target_core_pscsi.c
@@ -35,8 +35,10 @@
#include <linux/spinlock.h>
#include <linux/genhd.h>
#include <linux/cdrom.h>
-#include <linux/file.h>
+#include <linux/ratelimit.h>
#include <linux/module.h>
+#include <asm/unaligned.h>
+
#include <scsi/scsi.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_cmnd.h>
@@ -46,6 +48,7 @@
#include <target/target_core_base.h>
#include <target/target_core_backend.h>
+#include "target_core_alua.h"
#include "target_core_pscsi.h"
#define ISPRINT(a) ((a >= ' ') && (a <= '~'))
@@ -1019,6 +1022,470 @@ fail:
return -ENOMEM;
}
+static inline u32 pscsi_get_sectors_6(
+ unsigned char *cdb,
+ struct se_cmd *cmd,
+ int *ret)
+{
+ struct se_device *dev = cmd->se_dev;
+
+ /*
+ * Assume TYPE_DISK for non struct se_device objects.
+ * Use 8-bit sector value.
+ */
+ if (!dev)
+ goto type_disk;
+
+ /*
+ * Use 24-bit allocation length for TYPE_TAPE.
+ */
+ if (dev->transport->get_device_type(dev) == TYPE_TAPE)
+ return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
+
+ /*
+ * Everything else assume TYPE_DISK Sector CDB location.
+ * Use 8-bit sector value. SBC-3 says:
+ *
+ * A TRANSFER LENGTH field set to zero specifies that 256
+ * logical blocks shall be written. Any other value
+ * specifies the number of logical blocks that shall be
+ * written.
+ */
+type_disk:
+ return cdb[4] ? : 256;
+}
+
+static inline u32 pscsi_get_sectors_10(
+ unsigned char *cdb,
+ struct se_cmd *cmd,
+ int *ret)
+{
+ struct se_device *dev = cmd->se_dev;
+
+ /*
+ * Assume TYPE_DISK for non struct se_device objects.
+ * Use 16-bit sector value.
+ */
+ if (!dev)
+ goto type_disk;
+
+ /*
+ * XXX_10 is not defined in SSC, throw an exception
+ */
+ if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
+ *ret = -EINVAL;
+ return 0;
+ }
+
+ /*
+ * Everything else assume TYPE_DISK Sector CDB location.
+ * Use 16-bit sector value.
+ */
+type_disk:
+ return (u32)(cdb[7] << 8) + cdb[8];
+}
+
+static inline u32 pscsi_get_sectors_12(
+ unsigned char *cdb,
+ struct se_cmd *cmd,
+ int *ret)
+{
+ struct se_device *dev = cmd->se_dev;
+
+ /*
+ * Assume TYPE_DISK for non struct se_device objects.
+ * Use 32-bit sector value.
+ */
+ if (!dev)
+ goto type_disk;
+
+ /*
+ * XXX_12 is not defined in SSC, throw an exception
+ */
+ if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
+ *ret = -EINVAL;
+ return 0;
+ }
+
+ /*
+ * Everything else assume TYPE_DISK Sector CDB location.
+ * Use 32-bit sector value.
+ */
+type_disk:
+ return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
+}
+
+static inline u32 pscsi_get_sectors_16(
+ unsigned char *cdb,
+ struct se_cmd *cmd,
+ int *ret)
+{
+ struct se_device *dev = cmd->se_dev;
+
+ /*
+ * Assume TYPE_DISK for non struct se_device objects.
+ * Use 32-bit sector value.
+ */
+ if (!dev)
+ goto type_disk;
+
+ /*
+ * Use 24-bit allocation length for TYPE_TAPE.
+ */
+ if (dev->transport->get_device_type(dev) == TYPE_TAPE)
+ return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
+
+type_disk:
+ return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
+ (cdb[12] << 8) + cdb[13];
+}
+
+/*
+ * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
+ */
+static inline u32 pscsi_get_sectors_32(
+ unsigned char *cdb,
+ struct se_cmd *cmd,
+ int *ret)
+{
+ /*
+ * Assume TYPE_DISK for non struct se_device objects.
+ * Use 32-bit sector value.
+ */
+ return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
+ (cdb[30] << 8) + cdb[31];
+
+}
+
+static inline u32 pscsi_get_lba_21(unsigned char *cdb)
+{
+ return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
+}
+
+static inline u32 pscsi_get_lba_32(unsigned char *cdb)
+{
+ return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
+}
+
+static inline unsigned long long pscsi_get_lba_64(unsigned char *cdb)
+{
+ unsigned int __v1, __v2;
+
+ __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
+ __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
+
+ return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
+}
+
+/*
+ * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
+ */
+static inline unsigned long long pscsi_get_lba_64_ext(unsigned char *cdb)
+{
+ unsigned int __v1, __v2;
+
+ __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
+ __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
+
+ return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
+}
+
+
+static inline u32 pscsi_get_size(
+ u32 sectors,
+ unsigned char *cdb,
+ struct se_cmd *cmd)
+{
+ struct se_device *dev = cmd->se_dev;
+
+ if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
+ if (cdb[1] & 1) { /* sectors */
+ return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
+ } else /* bytes */
+ return sectors;
+ }
+
+ pr_debug("Returning block_size: %u, sectors: %u == %u for"
+ " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size,
+ sectors, dev->se_sub_dev->se_dev_attrib.block_size * sectors,
+ dev->transport->name);
+
+ return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
+}
+
+static int pscsi_parse_cdb(struct se_cmd *cmd, unsigned int *size)
+{
+ struct se_device *dev = cmd->se_dev;
+ struct se_subsystem_dev *su_dev = dev->se_sub_dev;
+ unsigned char *cdb = cmd->t_task_cdb;
+ int sector_ret = 0;
+ u32 sectors = 0;
+ u16 service_action;
+ int ret;
+
+ if (cmd->se_cmd_flags & SCF_BIDI)
+ goto out_unsupported_cdb;
+
+ switch (cdb[0]) {
+ case READ_6:
+ sectors = pscsi_get_sectors_6(cdb, cmd, &sector_ret);
+ if (sector_ret)
+ goto out_unsupported_cdb;
+ *size = pscsi_get_size(sectors, cdb, cmd);
+ cmd->t_task_lba = pscsi_get_lba_21(cdb);
+ cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
+ break;
+ case READ_10:
+ sectors = pscsi_get_sectors_10(cdb, cmd, &sector_ret);
+ if (sector_ret)
+ goto out_unsupported_cdb;
+ *size = pscsi_get_size(sectors, cdb, cmd);
+ cmd->t_task_lba = pscsi_get_lba_32(cdb);
+ cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
+ break;
+ case READ_12:
+ sectors = pscsi_get_sectors_12(cdb, cmd, &sector_ret);
+ if (sector_ret)
+ goto out_unsupported_cdb;
+ *size = pscsi_get_size(sectors, cdb, cmd);
+ cmd->t_task_lba = pscsi_get_lba_32(cdb);
+ cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
+ break;
+ case READ_16:
+ sectors = pscsi_get_sectors_16(cdb, cmd, &sector_ret);
+ if (sector_ret)
+ goto out_unsupported_cdb;
+ *size = pscsi_get_size(sectors, cdb, cmd);
+ cmd->t_task_lba = pscsi_get_lba_64(cdb);
+ cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
+ break;
+ case WRITE_6:
+ sectors = pscsi_get_sectors_6(cdb, cmd, &sector_ret);
+ if (sector_ret)
+ goto out_unsupported_cdb;
+ *size = pscsi_get_size(sectors, cdb, cmd);
+ cmd->t_task_lba = pscsi_get_lba_21(cdb);
+ cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
+ break;
+ case WRITE_10:
+ case WRITE_VERIFY:
+ sectors = pscsi_get_sectors_10(cdb, cmd, &sector_ret);
+ if (sector_ret)
+ goto out_unsupported_cdb;
+ *size = pscsi_get_size(sectors, cdb, cmd);
+ cmd->t_task_lba = pscsi_get_lba_32(cdb);
+ if (cdb[1] & 0x8)
+ cmd->se_cmd_flags |= SCF_FUA;
+ cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
+ break;
+ case WRITE_12:
+ sectors = pscsi_get_sectors_12(cdb, cmd, &sector_ret);
+ if (sector_ret)
+ goto out_unsupported_cdb;
+ *size = pscsi_get_size(sectors, cdb, cmd);
+ cmd->t_task_lba = pscsi_get_lba_32(cdb);
+ if (cdb[1] & 0x8)
+ cmd->se_cmd_flags |= SCF_FUA;
+ cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
+ break;
+ case WRITE_16:
+ sectors = pscsi_get_sectors_16(cdb, cmd, &sector_ret);
+ if (sector_ret)
+ goto out_unsupported_cdb;
+ *size = pscsi_get_size(sectors, cdb, cmd);
+ cmd->t_task_lba = pscsi_get_lba_64(cdb);
+ if (cdb[1] & 0x8)
+ cmd->se_cmd_flags |= SCF_FUA;
+ cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
+ break;
+ case VARIABLE_LENGTH_CMD:
+ service_action = get_unaligned_be16(&cdb[8]);
+ switch (service_action) {
+ case WRITE_SAME_32:
+ sectors = pscsi_get_sectors_32(cdb, cmd, &sector_ret);
+ if (sector_ret)
+ goto out_unsupported_cdb;
+
+ if (!sectors) {
+ pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
+ " supported\n");
+ goto out_invalid_cdb_field;
+ }
+
+ *size = pscsi_get_size(1, cdb, cmd);
+ cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
+ break;
+ default:
+ pr_err("VARIABLE_LENGTH_CMD service action"
+ " 0x%04x not supported\n", service_action);
+ goto out_unsupported_cdb;
+ }
+ break;
+ case GPCMD_READ_BUFFER_CAPACITY:
+ case GPCMD_SEND_OPC:
+ *size = (cdb[7] << 8) + cdb[8];
+ break;
+ case READ_BLOCK_LIMITS:
+ *size = READ_BLOCK_LEN;
+ break;
+ case GPCMD_GET_CONFIGURATION:
+ case GPCMD_READ_FORMAT_CAPACITIES:
+ case GPCMD_READ_DISC_INFO:
+ case GPCMD_READ_TRACK_RZONE_INFO:
+ *size = (cdb[7] << 8) + cdb[8];
+ break;
+ case GPCMD_MECHANISM_STATUS:
+ case GPCMD_READ_DVD_STRUCTURE:
+ *size = (cdb[8] << 8) + cdb[9];
+ break;
+ case READ_POSITION:
+ *size = READ_POSITION_LEN;
+ break;
+ case READ_BUFFER:
+ *size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
+ break;
+ case READ_CAPACITY:
+ *size = READ_CAP_LEN;
+ break;
+ case READ_MEDIA_SERIAL_NUMBER:
+ case SERVICE_ACTION_IN:
+ case ACCESS_CONTROL_IN:
+ case ACCESS_CONTROL_OUT:
+ *size = (cdb[10] << 24) | (cdb[11] << 16) |
+ (cdb[12] << 8) | cdb[13];
+ break;
+ case READ_TOC:
+ *size = cdb[8];
+ break;
+ case READ_ELEMENT_STATUS:
+ *size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
+ break;
+ case SYNCHRONIZE_CACHE:
+ case SYNCHRONIZE_CACHE_16:
+ /*
+ * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
+ */
+ if (cdb[0] == SYNCHRONIZE_CACHE) {
+ sectors = pscsi_get_sectors_10(cdb, cmd, &sector_ret);
+ cmd->t_task_lba = pscsi_get_lba_32(cdb);
+ } else {
+ sectors = pscsi_get_sectors_16(cdb, cmd, &sector_ret);
+ cmd->t_task_lba = pscsi_get_lba_64(cdb);
+ }
+ if (sector_ret)
+ goto out_unsupported_cdb;
+
+ *size = pscsi_get_size(sectors, cdb, cmd);
+ break;
+ case UNMAP:
+ *size = get_unaligned_be16(&cdb[7]);
+ break;
+ case WRITE_SAME_16:
+ sectors = pscsi_get_sectors_16(cdb, cmd, &sector_ret);
+ if (sector_ret)
+ goto out_unsupported_cdb;
+
+ if (!sectors) {
+ pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
+ goto out_invalid_cdb_field;
+ }
+
+ *size = pscsi_get_size(1, cdb, cmd);
+ cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
+ break;
+ case WRITE_SAME:
+ sectors = pscsi_get_sectors_10(cdb, cmd, &sector_ret);
+ if (sector_ret)
+ goto out_unsupported_cdb;
+
+ if (!sectors) {
+ pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
+ goto out_invalid_cdb_field;
+ }
+
+ *size = pscsi_get_size(1, cdb, cmd);
+ cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
+ break;
+ case ALLOW_MEDIUM_REMOVAL:
+ case ERASE:
+ case REZERO_UNIT:
+ case SEEK_10:
+ case SPACE:
+ case START_STOP:
+ case VERIFY:
+ case WRITE_FILEMARKS:
+ case GPCMD_CLOSE_TRACK:
+ case INITIALIZE_ELEMENT_STATUS:
+ case GPCMD_LOAD_UNLOAD:
+ case GPCMD_SET_SPEED:
+ case MOVE_MEDIUM:
+ *size = 0;
+ break;
+ case GET_EVENT_STATUS_NOTIFICATION:
+ *size = (cdb[7] << 8) | cdb[8];
+ break;
+ case ATA_16:
+ switch (cdb[2] & 0x3) { /* T_LENGTH */
+ case 0x0:
+ sectors = 0;
+ break;
+ case 0x1:
+ sectors = (((cdb[1] & 0x1) ? cdb[3] : 0) << 8) | cdb[4];
+ break;
+ case 0x2:
+ sectors = (((cdb[1] & 0x1) ? cdb[5] : 0) << 8) | cdb[6];
+ break;
+ case 0x3:
+ pr_err("T_LENGTH=0x3 not supported for ATA_16\n");
+ goto out_invalid_cdb_field;
+ }
+
+ /* BYTE_BLOCK */
+ if (cdb[2] & 0x4) {
+ /* BLOCK T_TYPE: 512 or sector */
+ *size = sectors * ((cdb[2] & 0x10) ?
+ dev->se_sub_dev->se_dev_attrib.block_size : 512);
+ } else {
+ /* BYTE */
+ *size = sectors;
+ }
+ break;
+ default:
+ ret = spc_parse_cdb(cmd, size, true);
+ if (ret)
+ return ret;
+ }
+
+ if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
+ if (sectors > su_dev->se_dev_attrib.fabric_max_sectors) {
+ printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
+ " big sectors %u exceeds fabric_max_sectors:"
+ " %u\n", cdb[0], sectors,
+ su_dev->se_dev_attrib.fabric_max_sectors);
+ goto out_invalid_cdb_field;
+ }
+ if (sectors > su_dev->se_dev_attrib.hw_max_sectors) {
+ printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
+ " big sectors %u exceeds backend hw_max_sectors:"
+ " %u\n", cdb[0], sectors,
+ su_dev->se_dev_attrib.hw_max_sectors);
+ goto out_invalid_cdb_field;
+ }
+ }
+
+ return 0;
+
+out_unsupported_cdb:
+ cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+ cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
+ return -EINVAL;
+out_invalid_cdb_field:
+ cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+ cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
+ return -EINVAL;
+}
+
+
static int pscsi_execute_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
u32 sgl_nents, enum dma_data_direction data_direction)
{
@@ -1188,6 +1655,7 @@ static struct se_subsystem_api pscsi_template = {
.create_virtdevice = pscsi_create_virtdevice,
.free_device = pscsi_free_device,
.transport_complete = pscsi_transport_complete,
+ .parse_cdb = pscsi_parse_cdb,
.execute_cmd = pscsi_execute_cmd,
.check_configfs_dev_params = pscsi_check_configfs_dev_params,
.set_configfs_dev_params = pscsi_set_configfs_dev_params,
diff --git a/drivers/target/target_core_rd.c b/drivers/target/target_core_rd.c
index d0ceb87..d7e8382 100644
--- a/drivers/target/target_core_rd.c
+++ b/drivers/target/target_core_rd.c
@@ -468,6 +468,7 @@ static struct se_subsystem_api rd_mcp_template = {
.allocate_virtdevice = rd_allocate_virtdevice,
.create_virtdevice = rd_create_virtdevice,
.free_device = rd_free_device,
+ .parse_cdb = sbc_parse_cdb,
.execute_cmd = rd_execute_cmd,
.check_configfs_dev_params = rd_check_configfs_dev_params,
.set_configfs_dev_params = rd_set_configfs_dev_params,
diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c
new file mode 100644
index 0000000..9d1ca38
--- /dev/null
+++ b/drivers/target/target_core_sbc.c
@@ -0,0 +1,450 @@
+/*
+ * SCSI Block Commands (SBC) parsing and emulation.
+ *
+ * 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 <linux/ratelimit.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 inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors)
+{
+ return cmd->se_dev->se_sub_dev->se_dev_attrib.block_size * sectors;
+}
+
+static int sbc_check_valid_sectors(struct se_cmd *cmd)
+{
+ struct se_device *dev = cmd->se_dev;
+ unsigned long long end_lba;
+ u32 sectors;
+
+ sectors = cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size;
+ end_lba = dev->transport->get_blocks(dev) + 1;
+
+ if (cmd->t_task_lba + sectors > end_lba) {
+ pr_err("target: lba %llu, sectors %u exceeds end lba %llu\n",
+ cmd->t_task_lba, sectors, end_lba);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static inline u32 transport_get_sectors_6(unsigned char *cdb)
+{
+ /*
+ * Use 8-bit sector value. SBC-3 says:
+ *
+ * A TRANSFER LENGTH field set to zero specifies that 256
+ * logical blocks shall be written. Any other value
+ * specifies the number of logical blocks that shall be
+ * written.
+ */
+ return cdb[4] ? : 256;
+}
+
+static inline u32 transport_get_sectors_10(unsigned char *cdb)
+{
+ return (u32)(cdb[7] << 8) + cdb[8];
+}
+
+static inline u32 transport_get_sectors_12(unsigned char *cdb)
+{
+ return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
+}
+
+static inline u32 transport_get_sectors_16(unsigned char *cdb)
+{
+ return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
+ (cdb[12] << 8) + cdb[13];
+}
+
+/*
+ * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
+ */
+static inline u32 transport_get_sectors_32(unsigned char *cdb)
+{
+ return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
+ (cdb[30] << 8) + cdb[31];
+
+}
+
+static inline u32 transport_lba_21(unsigned char *cdb)
+{
+ return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
+}
+
+static inline u32 transport_lba_32(unsigned char *cdb)
+{
+ return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
+}
+
+static inline unsigned long long transport_lba_64(unsigned char *cdb)
+{
+ unsigned int __v1, __v2;
+
+ __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
+ __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
+
+ return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
+}
+
+/*
+ * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
+ */
+static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
+{
+ unsigned int __v1, __v2;
+
+ __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
+ __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
+
+ return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
+}
+
+static int sbc_write_same_supported(struct se_device *dev,
+ unsigned char *flags)
+{
+ if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
+ pr_err("WRITE_SAME PBDATA and LBDATA"
+ " bits not supported for Block Discard"
+ " Emulation\n");
+ return -ENOSYS;
+ }
+
+ /*
+ * Currently for the emulated case we only accept
+ * tpws with the UNMAP=1 bit set.
+ */
+ if (!(flags[0] & 0x08)) {
+ pr_err("WRITE_SAME w/o UNMAP bit not"
+ " supported for Block Discard Emulation\n");
+ return -ENOSYS;
+ }
+
+ return 0;
+}
+
+static void xdreadwrite_callback(struct se_cmd *cmd)
+{
+ unsigned char *buf, *addr;
+ struct scatterlist *sg;
+ unsigned int offset;
+ int i;
+ int count;
+ /*
+ * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
+ *
+ * 1) read the specified logical block(s);
+ * 2) transfer logical blocks from the data-out buffer;
+ * 3) XOR the logical blocks transferred from the data-out buffer with
+ * the logical blocks read, storing the resulting XOR data in a buffer;
+ * 4) if the DISABLE WRITE bit is set to zero, then write the logical
+ * blocks transferred from the data-out buffer; and
+ * 5) transfer the resulting XOR data to the data-in buffer.
+ */
+ buf = kmalloc(cmd->data_length, GFP_KERNEL);
+ if (!buf) {
+ pr_err("Unable to allocate xor_callback buf\n");
+ return;
+ }
+ /*
+ * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
+ * into the locally allocated *buf
+ */
+ sg_copy_to_buffer(cmd->t_data_sg,
+ cmd->t_data_nents,
+ buf,
+ cmd->data_length);
+
+ /*
+ * Now perform the XOR against the BIDI read memory located at
+ * cmd->t_mem_bidi_list
+ */
+
+ offset = 0;
+ for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
+ addr = kmap_atomic(sg_page(sg));
+ if (!addr)
+ goto out;
+
+ for (i = 0; i < sg->length; i++)
+ *(addr + sg->offset + i) ^= *(buf + offset + i);
+
+ offset += sg->length;
+ kunmap_atomic(addr);
+ }
+
+out:
+ kfree(buf);
+}
+
+int sbc_parse_cdb(struct se_cmd *cmd, unsigned int *size)
+{
+ struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
+ struct se_device *dev = cmd->se_dev;
+ unsigned char *cdb = cmd->t_task_cdb;
+ u32 sectors = 0;
+ int ret;
+
+ switch (cdb[0]) {
+ case READ_6:
+ sectors = transport_get_sectors_6(cdb);
+ cmd->t_task_lba = transport_lba_21(cdb);
+ cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
+ break;
+ case READ_10:
+ sectors = transport_get_sectors_10(cdb);
+ cmd->t_task_lba = transport_lba_32(cdb);
+ cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
+ break;
+ case READ_12:
+ sectors = transport_get_sectors_12(cdb);
+ cmd->t_task_lba = transport_lba_32(cdb);
+ cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
+ break;
+ case READ_16:
+ sectors = transport_get_sectors_16(cdb);
+ cmd->t_task_lba = transport_lba_64(cdb);
+ cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
+ break;
+ case WRITE_6:
+ sectors = transport_get_sectors_6(cdb);
+ cmd->t_task_lba = transport_lba_21(cdb);
+ cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
+ break;
+ case WRITE_10:
+ case WRITE_VERIFY:
+ sectors = transport_get_sectors_10(cdb);
+ cmd->t_task_lba = transport_lba_32(cdb);
+ if (cdb[1] & 0x8)
+ cmd->se_cmd_flags |= SCF_FUA;
+ cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
+ break;
+ case WRITE_12:
+ sectors = transport_get_sectors_12(cdb);
+ cmd->t_task_lba = transport_lba_32(cdb);
+ if (cdb[1] & 0x8)
+ cmd->se_cmd_flags |= SCF_FUA;
+ cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
+ break;
+ case WRITE_16:
+ sectors = transport_get_sectors_16(cdb);
+ cmd->t_task_lba = transport_lba_64(cdb);
+ if (cdb[1] & 0x8)
+ cmd->se_cmd_flags |= SCF_FUA;
+ cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
+ break;
+ case XDWRITEREAD_10:
+ if ((cmd->data_direction != DMA_TO_DEVICE) ||
+ !(cmd->se_cmd_flags & SCF_BIDI))
+ goto out_invalid_cdb_field;
+ sectors = transport_get_sectors_10(cdb);
+
+ cmd->t_task_lba = transport_lba_32(cdb);
+ cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
+
+ /*
+ * Setup BIDI XOR callback to be run after I/O completion.
+ */
+ cmd->transport_complete_callback = &xdreadwrite_callback;
+ if (cdb[1] & 0x8)
+ cmd->se_cmd_flags |= SCF_FUA;
+ break;
+ case VARIABLE_LENGTH_CMD:
+ {
+ u16 service_action = get_unaligned_be16(&cdb[8]);
+ switch (service_action) {
+ case XDWRITEREAD_32:
+ sectors = transport_get_sectors_32(cdb);
+
+ /*
+ * Use WRITE_32 and READ_32 opcodes for the emulated
+ * XDWRITE_READ_32 logic.
+ */
+ cmd->t_task_lba = transport_lba_64_ext(cdb);
+ cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
+
+ /*
+ * Setup BIDI XOR callback to be run during after I/O
+ * completion.
+ */
+ cmd->transport_complete_callback = &xdreadwrite_callback;
+ if (cdb[1] & 0x8)
+ cmd->se_cmd_flags |= SCF_FUA;
+ break;
+ case WRITE_SAME_32:
+ sectors = transport_get_sectors_32(cdb);
+ if (!sectors) {
+ pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
+ " supported\n");
+ goto out_invalid_cdb_field;
+ }
+
+ *size = sbc_get_size(cmd, 1);
+ cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
+
+ if (sbc_write_same_supported(dev, &cdb[10]) < 0)
+ goto out_unsupported_cdb;
+ cmd->execute_cmd = target_emulate_write_same;
+ break;
+ default:
+ pr_err("VARIABLE_LENGTH_CMD service action"
+ " 0x%04x not supported\n", service_action);
+ goto out_unsupported_cdb;
+ }
+ break;
+ }
+ case READ_CAPACITY:
+ *size = READ_CAP_LEN;
+ cmd->execute_cmd = target_emulate_readcapacity;
+ break;
+ case SERVICE_ACTION_IN:
+ switch (cmd->t_task_cdb[1] & 0x1f) {
+ case SAI_READ_CAPACITY_16:
+ cmd->execute_cmd = target_emulate_readcapacity_16;
+ break;
+ default:
+ pr_err("Unsupported SA: 0x%02x\n",
+ cmd->t_task_cdb[1] & 0x1f);
+ goto out_invalid_cdb_field;
+ }
+ *size = (cdb[10] << 24) | (cdb[11] << 16) |
+ (cdb[12] << 8) | cdb[13];
+ break;
+ case SYNCHRONIZE_CACHE:
+ case SYNCHRONIZE_CACHE_16:
+ /*
+ * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
+ */
+ if (cdb[0] == SYNCHRONIZE_CACHE) {
+ sectors = transport_get_sectors_10(cdb);
+ cmd->t_task_lba = transport_lba_32(cdb);
+ } else {
+ sectors = transport_get_sectors_16(cdb);
+ cmd->t_task_lba = transport_lba_64(cdb);
+ }
+
+ *size = sbc_get_size(cmd, sectors);
+
+ /*
+ * Check to ensure that LBA + Range does not exceed past end of
+ * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
+ */
+ if (cmd->t_task_lba || sectors) {
+ if (sbc_check_valid_sectors(cmd) < 0)
+ goto out_invalid_cdb_field;
+ }
+ cmd->execute_cmd = target_emulate_synchronize_cache;
+ break;
+ case UNMAP:
+ *size = get_unaligned_be16(&cdb[7]);
+ cmd->execute_cmd = target_emulate_unmap;
+ break;
+ case WRITE_SAME_16:
+ sectors = transport_get_sectors_16(cdb);
+ if (!sectors) {
+ pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
+ goto out_invalid_cdb_field;
+ }
+
+ *size = sbc_get_size(cmd, 1);
+ cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
+
+ if (sbc_write_same_supported(dev, &cdb[1]) < 0)
+ goto out_unsupported_cdb;
+ cmd->execute_cmd = target_emulate_write_same;
+ break;
+ case WRITE_SAME:
+ sectors = transport_get_sectors_10(cdb);
+ if (!sectors) {
+ pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
+ goto out_invalid_cdb_field;
+ }
+
+ *size = sbc_get_size(cmd, 1);
+ cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
+
+ /*
+ * Follow sbcr26 with WRITE_SAME (10) and check for the existence
+ * of byte 1 bit 3 UNMAP instead of original reserved field
+ */
+ if (sbc_write_same_supported(dev, &cdb[1]) < 0)
+ goto out_unsupported_cdb;
+ cmd->execute_cmd = target_emulate_write_same;
+ break;
+ case VERIFY:
+ *size = 0;
+ cmd->execute_cmd = target_emulate_noop;
+ break;
+ default:
+ ret = spc_parse_cdb(cmd, size, false);
+ if (ret)
+ return ret;
+ }
+
+ /* reject any command that we don't have a handler for */
+ if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->execute_cmd)
+ goto out_unsupported_cdb;
+
+ if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
+ if (sectors > su_dev->se_dev_attrib.fabric_max_sectors) {
+ printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
+ " big sectors %u exceeds fabric_max_sectors:"
+ " %u\n", cdb[0], sectors,
+ su_dev->se_dev_attrib.fabric_max_sectors);
+ goto out_invalid_cdb_field;
+ }
+ if (sectors > su_dev->se_dev_attrib.hw_max_sectors) {
+ printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
+ " big sectors %u exceeds backend hw_max_sectors:"
+ " %u\n", cdb[0], sectors,
+ su_dev->se_dev_attrib.hw_max_sectors);
+ goto out_invalid_cdb_field;
+ }
+
+ *size = sbc_get_size(cmd, sectors);
+ }
+
+ return 0;
+
+out_unsupported_cdb:
+ cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+ cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
+ return -EINVAL;
+out_invalid_cdb_field:
+ cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+ cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
+ return -EINVAL;
+}
+EXPORT_SYMBOL(sbc_parse_cdb);
diff --git a/drivers/target/target_core_spc.c b/drivers/target/target_core_spc.c
index ec21086..156291f 100644
--- a/drivers/target/target_core_spc.c
+++ b/drivers/target/target_core_spc.c
@@ -152,6 +152,7 @@ int spc_parse_cdb(struct se_cmd *cmd, unsigned int *size, bool passthrough)
cmd->sam_task_attr = MSG_HEAD_TAG;
break;
case TEST_UNIT_READY:
+ *size = 0;
if (!passthrough)
cmd->execute_cmd = target_emulate_noop;
break;
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index baa7019..28a46a2 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -1337,8 +1337,6 @@ static inline void transport_generic_prepare_cdb(
}
}
-static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
-
static int target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
{
struct se_device *dev = cmd->se_dev;
@@ -1465,6 +1463,7 @@ int target_setup_cmd_from_cdb(
u32 pr_reg_type = 0;
u8 alua_ascq = 0;
unsigned long flags;
+ unsigned int size;
int ret;
transport_generic_prepare_cdb(cdb);
@@ -1556,13 +1555,11 @@ int target_setup_cmd_from_cdb(
*/
}
- /*
- * Setup the received CDB based on SCSI defined opcodes and
- * perform unit attention, persistent reservations and ALUA
- * checks for virtual device backends. The cmd->t_task_cdb
- * pointer is expected to be setup before we reach this point.
- */
- ret = transport_generic_cmd_sequencer(cmd, cdb);
+ ret = cmd->se_dev->transport->parse_cdb(cmd, &size);
+ if (ret < 0)
+ return ret;
+
+ ret = target_cmd_size_check(cmd, size);
if (ret < 0)
return ret;
@@ -1688,10 +1685,7 @@ void target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
target_put_sess_cmd(se_sess, se_cmd);
return;
}
- /*
- * Sanitize CDBs via transport_generic_cmd_sequencer() and
- * allocate the necessary tasks to complete the received CDB+data
- */
+
rc = target_setup_cmd_from_cdb(se_cmd, cdb);
if (rc != 0) {
transport_generic_request_failure(se_cmd);
@@ -1960,39 +1954,6 @@ queue_full:
}
EXPORT_SYMBOL(transport_generic_request_failure);
-static inline u32 transport_lba_21(unsigned char *cdb)
-{
- return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
-}
-
-static inline u32 transport_lba_32(unsigned char *cdb)
-{
- return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
-}
-
-static inline unsigned long long transport_lba_64(unsigned char *cdb)
-{
- unsigned int __v1, __v2;
-
- __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
- __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
-
- return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
-}
-
-/*
- * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
- */
-static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
-{
- unsigned int __v1, __v2;
-
- __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
- __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
-
- return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
-}
-
/*
* Called from Fabric Module context from transport_execute_tasks()
*
@@ -2141,217 +2102,6 @@ check_depth:
return 0;
}
-static inline u32 transport_get_sectors_6(
- unsigned char *cdb,
- struct se_cmd *cmd,
- int *ret)
-{
- struct se_device *dev = cmd->se_dev;
-
- /*
- * Assume TYPE_DISK for non struct se_device objects.
- * Use 8-bit sector value.
- */
- if (!dev)
- goto type_disk;
-
- /*
- * Use 24-bit allocation length for TYPE_TAPE.
- */
- if (dev->transport->get_device_type(dev) == TYPE_TAPE)
- return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
-
- /*
- * Everything else assume TYPE_DISK Sector CDB location.
- * Use 8-bit sector value. SBC-3 says:
- *
- * A TRANSFER LENGTH field set to zero specifies that 256
- * logical blocks shall be written. Any other value
- * specifies the number of logical blocks that shall be
- * written.
- */
-type_disk:
- return cdb[4] ? : 256;
-}
-
-static inline u32 transport_get_sectors_10(
- unsigned char *cdb,
- struct se_cmd *cmd,
- int *ret)
-{
- struct se_device *dev = cmd->se_dev;
-
- /*
- * Assume TYPE_DISK for non struct se_device objects.
- * Use 16-bit sector value.
- */
- if (!dev)
- goto type_disk;
-
- /*
- * XXX_10 is not defined in SSC, throw an exception
- */
- if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
- *ret = -EINVAL;
- return 0;
- }
-
- /*
- * Everything else assume TYPE_DISK Sector CDB location.
- * Use 16-bit sector value.
- */
-type_disk:
- return (u32)(cdb[7] << 8) + cdb[8];
-}
-
-static inline u32 transport_get_sectors_12(
- unsigned char *cdb,
- struct se_cmd *cmd,
- int *ret)
-{
- struct se_device *dev = cmd->se_dev;
-
- /*
- * Assume TYPE_DISK for non struct se_device objects.
- * Use 32-bit sector value.
- */
- if (!dev)
- goto type_disk;
-
- /*
- * XXX_12 is not defined in SSC, throw an exception
- */
- if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
- *ret = -EINVAL;
- return 0;
- }
-
- /*
- * Everything else assume TYPE_DISK Sector CDB location.
- * Use 32-bit sector value.
- */
-type_disk:
- return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
-}
-
-static inline u32 transport_get_sectors_16(
- unsigned char *cdb,
- struct se_cmd *cmd,
- int *ret)
-{
- struct se_device *dev = cmd->se_dev;
-
- /*
- * Assume TYPE_DISK for non struct se_device objects.
- * Use 32-bit sector value.
- */
- if (!dev)
- goto type_disk;
-
- /*
- * Use 24-bit allocation length for TYPE_TAPE.
- */
- if (dev->transport->get_device_type(dev) == TYPE_TAPE)
- return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
-
-type_disk:
- return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
- (cdb[12] << 8) + cdb[13];
-}
-
-/*
- * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
- */
-static inline u32 transport_get_sectors_32(
- unsigned char *cdb,
- struct se_cmd *cmd,
- int *ret)
-{
- /*
- * Assume TYPE_DISK for non struct se_device objects.
- * Use 32-bit sector value.
- */
- return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
- (cdb[30] << 8) + cdb[31];
-
-}
-
-static inline u32 transport_get_size(
- u32 sectors,
- unsigned char *cdb,
- struct se_cmd *cmd)
-{
- struct se_device *dev = cmd->se_dev;
-
- if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
- if (cdb[1] & 1) { /* sectors */
- return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
- } else /* bytes */
- return sectors;
- }
-
- pr_debug("Returning block_size: %u, sectors: %u == %u for"
- " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size,
- sectors, dev->se_sub_dev->se_dev_attrib.block_size * sectors,
- dev->transport->name);
-
- return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
-}
-
-static void transport_xor_callback(struct se_cmd *cmd)
-{
- unsigned char *buf, *addr;
- struct scatterlist *sg;
- unsigned int offset;
- int i;
- int count;
- /*
- * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
- *
- * 1) read the specified logical block(s);
- * 2) transfer logical blocks from the data-out buffer;
- * 3) XOR the logical blocks transferred from the data-out buffer with
- * the logical blocks read, storing the resulting XOR data in a buffer;
- * 4) if the DISABLE WRITE bit is set to zero, then write the logical
- * blocks transferred from the data-out buffer; and
- * 5) transfer the resulting XOR data to the data-in buffer.
- */
- buf = kmalloc(cmd->data_length, GFP_KERNEL);
- if (!buf) {
- pr_err("Unable to allocate xor_callback buf\n");
- return;
- }
- /*
- * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
- * into the locally allocated *buf
- */
- sg_copy_to_buffer(cmd->t_data_sg,
- cmd->t_data_nents,
- buf,
- cmd->data_length);
-
- /*
- * Now perform the XOR against the BIDI read memory located at
- * cmd->t_mem_bidi_list
- */
-
- offset = 0;
- for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
- addr = kmap_atomic(sg_page(sg));
- if (!addr)
- goto out;
-
- for (i = 0; i < sg->length; i++)
- *(addr + sg->offset + i) ^= *(buf + offset + i);
-
- offset += sg->length;
- kunmap_atomic(addr);
- }
-
-out:
- kfree(buf);
-}
-
/*
* Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
*/
@@ -2433,478 +2183,6 @@ static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
return 0;
}
-static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
-{
- /*
- * Determine if the received WRITE_SAME is used to for direct
- * passthrough into Linux/SCSI with struct request via TCM/pSCSI
- * or we are signaling the use of internal WRITE_SAME + UNMAP=1
- * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
- */
- int passthrough = (dev->transport->transport_type ==
- TRANSPORT_PLUGIN_PHBA_PDEV);
-
- if (!passthrough) {
- if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
- pr_err("WRITE_SAME PBDATA and LBDATA"
- " bits not supported for Block Discard"
- " Emulation\n");
- return -ENOSYS;
- }
- /*
- * Currently for the emulated case we only accept
- * tpws with the UNMAP=1 bit set.
- */
- if (!(flags[0] & 0x08)) {
- pr_err("WRITE_SAME w/o UNMAP bit not"
- " supported for Block Discard Emulation\n");
- return -ENOSYS;
- }
- }
-
- return 0;
-}
-
-static int transport_generic_cmd_sequencer(
- struct se_cmd *cmd,
- unsigned char *cdb)
-{
- struct se_device *dev = cmd->se_dev;
- struct se_subsystem_dev *su_dev = dev->se_sub_dev;
- int sector_ret = 0, passthrough;
- u32 sectors = 0, size = 0;
- u16 service_action;
- int ret;
-
- /*
- * If we operate in passthrough mode we skip most CDB emulation and
- * instead hand the commands down to the physical SCSI device.
- */
- passthrough =
- (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV);
-
- switch (cdb[0]) {
- case READ_6:
- sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
- if (sector_ret)
- goto out_unsupported_cdb;
- size = transport_get_size(sectors, cdb, cmd);
- cmd->t_task_lba = transport_lba_21(cdb);
- cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
- break;
- case READ_10:
- sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
- if (sector_ret)
- goto out_unsupported_cdb;
- size = transport_get_size(sectors, cdb, cmd);
- cmd->t_task_lba = transport_lba_32(cdb);
- cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
- break;
- case READ_12:
- sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
- if (sector_ret)
- goto out_unsupported_cdb;
- size = transport_get_size(sectors, cdb, cmd);
- cmd->t_task_lba = transport_lba_32(cdb);
- cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
- break;
- case READ_16:
- sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
- if (sector_ret)
- goto out_unsupported_cdb;
- size = transport_get_size(sectors, cdb, cmd);
- cmd->t_task_lba = transport_lba_64(cdb);
- cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
- break;
- case WRITE_6:
- sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
- if (sector_ret)
- goto out_unsupported_cdb;
- size = transport_get_size(sectors, cdb, cmd);
- cmd->t_task_lba = transport_lba_21(cdb);
- cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
- break;
- case WRITE_10:
- case WRITE_VERIFY:
- sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
- if (sector_ret)
- goto out_unsupported_cdb;
- size = transport_get_size(sectors, cdb, cmd);
- cmd->t_task_lba = transport_lba_32(cdb);
- if (cdb[1] & 0x8)
- cmd->se_cmd_flags |= SCF_FUA;
- cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
- break;
- case WRITE_12:
- sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
- if (sector_ret)
- goto out_unsupported_cdb;
- size = transport_get_size(sectors, cdb, cmd);
- cmd->t_task_lba = transport_lba_32(cdb);
- if (cdb[1] & 0x8)
- cmd->se_cmd_flags |= SCF_FUA;
- cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
- break;
- case WRITE_16:
- sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
- if (sector_ret)
- goto out_unsupported_cdb;
- size = transport_get_size(sectors, cdb, cmd);
- cmd->t_task_lba = transport_lba_64(cdb);
- if (cdb[1] & 0x8)
- cmd->se_cmd_flags |= SCF_FUA;
- cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
- break;
- case XDWRITEREAD_10:
- if ((cmd->data_direction != DMA_TO_DEVICE) ||
- !(cmd->se_cmd_flags & SCF_BIDI))
- goto out_invalid_cdb_field;
- sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
- if (sector_ret)
- goto out_unsupported_cdb;
- size = transport_get_size(sectors, cdb, cmd);
- cmd->t_task_lba = transport_lba_32(cdb);
- cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
-
- /*
- * Do now allow BIDI commands for passthrough mode.
- */
- if (passthrough)
- goto out_unsupported_cdb;
-
- /*
- * Setup BIDI XOR callback to be run after I/O completion.
- */
- cmd->transport_complete_callback = &transport_xor_callback;
- if (cdb[1] & 0x8)
- cmd->se_cmd_flags |= SCF_FUA;
- break;
- case VARIABLE_LENGTH_CMD:
- service_action = get_unaligned_be16(&cdb[8]);
- switch (service_action) {
- case XDWRITEREAD_32:
- sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
- if (sector_ret)
- goto out_unsupported_cdb;
- size = transport_get_size(sectors, cdb, cmd);
- /*
- * Use WRITE_32 and READ_32 opcodes for the emulated
- * XDWRITE_READ_32 logic.
- */
- cmd->t_task_lba = transport_lba_64_ext(cdb);
- cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
-
- /*
- * Do now allow BIDI commands for passthrough mode.
- */
- if (passthrough)
- goto out_unsupported_cdb;
-
- /*
- * Setup BIDI XOR callback to be run during after I/O
- * completion.
- */
- cmd->transport_complete_callback = &transport_xor_callback;
- if (cdb[1] & 0x8)
- cmd->se_cmd_flags |= SCF_FUA;
- break;
- case WRITE_SAME_32:
- sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
- if (sector_ret)
- goto out_unsupported_cdb;
-
- if (sectors)
- size = transport_get_size(1, cdb, cmd);
- else {
- pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
- " supported\n");
- goto out_invalid_cdb_field;
- }
-
- cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
-
- if (target_check_write_same_discard(&cdb[10], dev) < 0)
- goto out_unsupported_cdb;
- if (!passthrough)
- cmd->execute_cmd = target_emulate_write_same;
- break;
- default:
- pr_err("VARIABLE_LENGTH_CMD service action"
- " 0x%04x not supported\n", service_action);
- goto out_unsupported_cdb;
- }
- 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 &&
- su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
- cmd->execute_cmd =
- target_emulate_report_target_port_groups;
- }
- size = (cdb[6] << 24) | (cdb[7] << 16) |
- (cdb[8] << 8) | cdb[9];
- } else {
- /* GPCMD_SEND_KEY from multi media commands */
- size = (cdb[8] << 8) + cdb[9];
- }
- break;
- case GPCMD_READ_BUFFER_CAPACITY:
- case GPCMD_SEND_OPC:
- size = (cdb[7] << 8) + cdb[8];
- break;
- case READ_BLOCK_LIMITS:
- size = READ_BLOCK_LEN;
- break;
- case GPCMD_GET_CONFIGURATION:
- case GPCMD_READ_FORMAT_CAPACITIES:
- case GPCMD_READ_DISC_INFO:
- case GPCMD_READ_TRACK_RZONE_INFO:
- size = (cdb[7] << 8) + cdb[8];
- break;
- case GPCMD_MECHANISM_STATUS:
- case GPCMD_READ_DVD_STRUCTURE:
- size = (cdb[8] << 8) + cdb[9];
- break;
- case READ_POSITION:
- size = READ_POSITION_LEN;
- 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 &&
- su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
- cmd->execute_cmd =
- target_emulate_set_target_port_groups;
- }
-
- size = (cdb[6] << 24) | (cdb[7] << 16) |
- (cdb[8] << 8) | cdb[9];
- } else {
- /* GPCMD_REPORT_KEY from multi media commands */
- size = (cdb[8] << 8) + cdb[9];
- }
- break;
- case READ_BUFFER:
- size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
- break;
- case READ_CAPACITY:
- size = READ_CAP_LEN;
- if (!passthrough)
- cmd->execute_cmd = target_emulate_readcapacity;
- break;
- case READ_MEDIA_SERIAL_NUMBER:
- case SERVICE_ACTION_IN:
- switch (cmd->t_task_cdb[1] & 0x1f) {
- case SAI_READ_CAPACITY_16:
- if (!passthrough)
- cmd->execute_cmd =
- target_emulate_readcapacity_16;
- break;
- default:
- if (passthrough)
- break;
-
- pr_err("Unsupported SA: 0x%02x\n",
- cmd->t_task_cdb[1] & 0x1f);
- goto out_invalid_cdb_field;
- }
- /*FALLTHROUGH*/
- case ACCESS_CONTROL_IN:
- case ACCESS_CONTROL_OUT:
- size = (cdb[10] << 24) | (cdb[11] << 16) |
- (cdb[12] << 8) | cdb[13];
- break;
-/* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
-#if 0
- case GPCMD_READ_CD:
- sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
- size = (2336 * sectors);
- break;
-#endif
- case READ_TOC:
- size = cdb[8];
- break;
- case READ_ELEMENT_STATUS:
- size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
- break;
- case SYNCHRONIZE_CACHE:
- case SYNCHRONIZE_CACHE_16:
- /*
- * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
- */
- if (cdb[0] == SYNCHRONIZE_CACHE) {
- sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
- cmd->t_task_lba = transport_lba_32(cdb);
- } else {
- sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
- cmd->t_task_lba = transport_lba_64(cdb);
- }
- if (sector_ret)
- goto out_unsupported_cdb;
-
- size = transport_get_size(sectors, cdb, cmd);
-
- if (passthrough)
- break;
-
- /*
- * Check to ensure that LBA + Range does not exceed past end of
- * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
- */
- if ((cmd->t_task_lba != 0) || (sectors != 0)) {
- if (transport_cmd_get_valid_sectors(cmd) < 0)
- goto out_invalid_cdb_field;
- }
- cmd->execute_cmd = target_emulate_synchronize_cache;
- break;
- case UNMAP:
- size = get_unaligned_be16(&cdb[7]);
- if (!passthrough)
- cmd->execute_cmd = target_emulate_unmap;
- break;
- case WRITE_SAME_16:
- sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
- if (sector_ret)
- goto out_unsupported_cdb;
-
- if (sectors)
- size = transport_get_size(1, cdb, cmd);
- else {
- pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
- goto out_invalid_cdb_field;
- }
-
- cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
-
- if (target_check_write_same_discard(&cdb[1], dev) < 0)
- goto out_unsupported_cdb;
- if (!passthrough)
- cmd->execute_cmd = target_emulate_write_same;
- break;
- case WRITE_SAME:
- sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
- if (sector_ret)
- goto out_unsupported_cdb;
-
- if (sectors)
- size = transport_get_size(1, cdb, cmd);
- else {
- pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
- goto out_invalid_cdb_field;
- }
-
- cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
- /*
- * Follow sbcr26 with WRITE_SAME (10) and check for the existence
- * of byte 1 bit 3 UNMAP instead of original reserved field
- */
- if (target_check_write_same_discard(&cdb[1], dev) < 0)
- goto out_unsupported_cdb;
- if (!passthrough)
- cmd->execute_cmd = target_emulate_write_same;
- break;
- case ALLOW_MEDIUM_REMOVAL:
- case ERASE:
- case REZERO_UNIT:
- case SEEK_10:
- case SPACE:
- case START_STOP:
- case VERIFY:
- case WRITE_FILEMARKS:
- if (!passthrough)
- cmd->execute_cmd = target_emulate_noop;
- break;
- case GPCMD_CLOSE_TRACK:
- case INITIALIZE_ELEMENT_STATUS:
- case GPCMD_LOAD_UNLOAD:
- case GPCMD_SET_SPEED:
- case MOVE_MEDIUM:
- break;
- case GET_EVENT_STATUS_NOTIFICATION:
- size = (cdb[7] << 8) | cdb[8];
- break;
- case ATA_16:
- /* Only support ATA passthrough to pSCSI backends.. */
- if (!passthrough)
- goto out_unsupported_cdb;
-
- /* T_LENGTH */
- switch (cdb[2] & 0x3) {
- case 0x0:
- sectors = 0;
- break;
- case 0x1:
- sectors = (((cdb[1] & 0x1) ? cdb[3] : 0) << 8) | cdb[4];
- break;
- case 0x2:
- sectors = (((cdb[1] & 0x1) ? cdb[5] : 0) << 8) | cdb[6];
- break;
- case 0x3:
- pr_err("T_LENGTH=0x3 not supported for ATA_16\n");
- goto out_invalid_cdb_field;
- }
-
- /* BYTE_BLOCK */
- if (cdb[2] & 0x4) {
- /* BLOCK T_TYPE: 512 or sector */
- size = sectors * ((cdb[2] & 0x10) ?
- dev->se_sub_dev->se_dev_attrib.block_size : 512);
- } else {
- /* BYTE */
- size = sectors;
- }
- break;
- default:
- ret = spc_parse_cdb(cmd, &size, passthrough);
- if (ret)
- return ret;
- }
-
- ret = target_cmd_size_check(cmd, size);
- if (ret)
- return ret;
-
- if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
- if (sectors > su_dev->se_dev_attrib.fabric_max_sectors) {
- printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
- " big sectors %u exceeds fabric_max_sectors:"
- " %u\n", cdb[0], sectors,
- su_dev->se_dev_attrib.fabric_max_sectors);
- goto out_invalid_cdb_field;
- }
- if (sectors > su_dev->se_dev_attrib.hw_max_sectors) {
- printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
- " big sectors %u exceeds backend hw_max_sectors:"
- " %u\n", cdb[0], sectors,
- su_dev->se_dev_attrib.hw_max_sectors);
- goto out_invalid_cdb_field;
- }
- }
-
- /* reject any command that we don't have a handler for */
- if (!(passthrough || cmd->execute_cmd ||
- (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB)))
- goto out_unsupported_cdb;
-
- return 0;
-
-out_unsupported_cdb:
- cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
- cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
- return -EINVAL;
-out_invalid_cdb_field:
- cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
- cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
- return -EINVAL;
-}
-
/*
* Called from I/O completion to determine which dormant/delayed
* and ordered cmds need to have their tasks added to the execution queue.
diff --git a/include/target/target_core_backend.h b/include/target/target_core_backend.h
index 2d7db85..f4f1eef 100644
--- a/include/target/target_core_backend.h
+++ b/include/target/target_core_backend.h
@@ -24,6 +24,8 @@ struct se_subsystem_api {
struct se_subsystem_dev *, void *);
void (*free_device)(void *);
int (*transport_complete)(struct se_cmd *cmd, struct scatterlist *);
+
+ int (*parse_cdb)(struct se_cmd *cmd, unsigned int *size);
int (*execute_cmd)(struct se_cmd *, struct scatterlist *, u32,
enum dma_data_direction);
int (*do_discard)(struct se_device *, sector_t, u32);
@@ -49,6 +51,9 @@ struct se_device *transport_add_device_to_core_hba(struct se_hba *,
void target_complete_cmd(struct se_cmd *, u8);
+int sbc_parse_cdb(struct se_cmd *cmd, unsigned int *size);
+int spc_parse_cdb(struct se_cmd *cmd, unsigned int *size, bool passthrough);
+
void transport_set_vpd_proto_id(struct t10_vpd *, unsigned char *);
int transport_set_vpd_assoc(struct t10_vpd *, unsigned char *);
int transport_set_vpd_ident_type(struct t10_vpd *, unsigned char *);