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target: Move passthrough CDB parsing into a common function

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Aside from whether they handle BIDI ops or not, parsing of the CDB by
kernel and user SCSI passthrough modules should be identical. Move this
into a new passthrough_parse_cdb() and call it from tcm-pscsi and tcm-user.

Reported-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ilias Tsitsimpis <iliastsi@arrikto.com>
Signed-off-by: Andy Grover <agrover@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Andy Grover 2015-05-19 14:44:40 -07:00 committed by Nicholas Bellinger
parent 9c1cd1b68c
commit 7bfea53b5c
4 changed files with 78 additions and 94 deletions
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74
drivers/target/target_core_device.c
View File

@ -33,6 +33,7 @@
#include <linux/kthread.h>
#include <linux/in.h>
#include <linux/export.h>
#include <asm/unaligned.h>
#include <net/sock.h>
#include <net/tcp.h>
#include <scsi/scsi.h>
@ -1707,3 +1708,76 @@ void core_dev_release_virtual_lun0(void)
target_free_device(g_lun0_dev);
core_delete_hba(hba);
}
/*
* Common CDB parsing for kernel and user passthrough.
*/
sense_reason_t
passthrough_parse_cdb(struct se_cmd *cmd,
sense_reason_t (*exec_cmd)(struct se_cmd *cmd))
{
unsigned char *cdb = cmd->t_task_cdb;
/*
* Clear a lun set in the cdb if the initiator talking to use spoke
* and old standards version, as we can't assume the underlying device
* won't choke up on it.
*/
switch (cdb[0]) {
case READ_10: /* SBC - RDProtect */
case READ_12: /* SBC - RDProtect */
case READ_16: /* SBC - RDProtect */
case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
case VERIFY: /* SBC - VRProtect */
case VERIFY_16: /* SBC - VRProtect */
case WRITE_VERIFY: /* SBC - VRProtect */
case WRITE_VERIFY_12: /* SBC - VRProtect */
case MAINTENANCE_IN: /* SPC - Parameter Data Format for SA RTPG */
break;
default:
cdb[1] &= 0x1f; /* clear logical unit number */
break;
}
/*
* For REPORT LUNS we always need to emulate the response, for everything
* else, pass it up.
*/
if (cdb[0] == REPORT_LUNS) {
cmd->execute_cmd = spc_emulate_report_luns;
return TCM_NO_SENSE;
}
/* Set DATA_CDB flag for ops that should have it */
switch (cdb[0]) {
case READ_6:
case READ_10:
case READ_12:
case READ_16:
case WRITE_6:
case WRITE_10:
case WRITE_12:
case WRITE_16:
case WRITE_VERIFY:
case WRITE_VERIFY_12:
case 0x8e: /* WRITE_VERIFY_16 */
case COMPARE_AND_WRITE:
case XDWRITEREAD_10:
cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
break;
case VARIABLE_LENGTH_CMD:
switch (get_unaligned_be16(&cdb[8])) {
case READ_32:
case WRITE_32:
case 0x0c: /* WRITE_VERIFY_32 */
case XDWRITEREAD_32:
cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
break;
}
}
cmd->execute_cmd = exec_cmd;
return TCM_NO_SENSE;
}
EXPORT_SYMBOL(passthrough_parse_cdb);

53
drivers/target/target_core_pscsi.c
View File

@ -973,64 +973,13 @@ fail:
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
}
/*
* Clear a lun set in the cdb if the initiator talking to use spoke
* and old standards version, as we can't assume the underlying device
* won't choke up on it.
*/
static inline void pscsi_clear_cdb_lun(unsigned char *cdb)
{
switch (cdb[0]) {
case READ_10: /* SBC - RDProtect */
case READ_12: /* SBC - RDProtect */
case READ_16: /* SBC - RDProtect */
case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
case VERIFY: /* SBC - VRProtect */
case VERIFY_16: /* SBC - VRProtect */
case WRITE_VERIFY: /* SBC - VRProtect */
case WRITE_VERIFY_12: /* SBC - VRProtect */
case MAINTENANCE_IN: /* SPC - Parameter Data Format for SA RTPG */
break;
default:
cdb[1] &= 0x1f; /* clear logical unit number */
break;
}
}
static sense_reason_t
pscsi_parse_cdb(struct se_cmd *cmd)
{
unsigned char *cdb = cmd->t_task_cdb;
if (cmd->se_cmd_flags & SCF_BIDI)
return TCM_UNSUPPORTED_SCSI_OPCODE;
pscsi_clear_cdb_lun(cdb);
/*
* For REPORT LUNS we always need to emulate the response, for everything
* else the default for pSCSI is to pass the command to the underlying
* LLD / physical hardware.
*/
switch (cdb[0]) {
case REPORT_LUNS:
cmd->execute_cmd = spc_emulate_report_luns;
return 0;
case READ_6:
case READ_10:
case READ_12:
case READ_16:
case WRITE_6:
case WRITE_10:
case WRITE_12:
case WRITE_16:
case WRITE_VERIFY:
cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
/* FALLTHROUGH*/
default:
cmd->execute_cmd = pscsi_execute_cmd;
return 0;
}
return passthrough_parse_cdb(cmd, pscsi_execute_cmd);
}
static sense_reason_t

43
drivers/target/target_core_user.c
View File

@ -1049,48 +1049,7 @@ tcmu_pass_op(struct se_cmd *se_cmd)
static sense_reason_t
tcmu_parse_cdb(struct se_cmd *cmd)
{
unsigned char *cdb = cmd->t_task_cdb;
/*
* For REPORT LUNS we always need to emulate the response, for everything
* else, pass it up.
*/
if (cdb[0] == REPORT_LUNS) {
cmd->execute_cmd = spc_emulate_report_luns;
return TCM_NO_SENSE;
}
/* Set DATA_CDB flag for ops that should have it */
switch (cdb[0]) {
case READ_6:
case READ_10:
case READ_12:
case READ_16:
case WRITE_6:
case WRITE_10:
case WRITE_12:
case WRITE_16:
case WRITE_VERIFY:
case WRITE_VERIFY_12:
case 0x8e: /* WRITE_VERIFY_16 */
case COMPARE_AND_WRITE:
case XDWRITEREAD_10:
cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
break;
case VARIABLE_LENGTH_CMD:
switch (get_unaligned_be16(&cdb[8])) {
case READ_32:
case WRITE_32:
case 0x0c: /* WRITE_VERIFY_32 */
case XDWRITEREAD_32:
cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
break;
}
}
cmd->execute_cmd = tcmu_pass_op;
return TCM_NO_SENSE;
return passthrough_parse_cdb(cmd, tcmu_pass_op);
}
DEF_TB_DEV_ATTRIB_RO(tcmu, hw_pi_prot_type);

2
include/target/target_core_backend.h
View File

@ -138,5 +138,7 @@ int se_dev_set_queue_depth(struct se_device *, u32);
int se_dev_set_max_sectors(struct se_device *, u32);
int se_dev_set_optimal_sectors(struct se_device *, u32);
int se_dev_set_block_size(struct se_device *, u32);
sense_reason_t passthrough_parse_cdb(struct se_cmd *cmd,
sense_reason_t (*exec_cmd)(struct se_cmd *cmd));
#endif /* TARGET_CORE_BACKEND_H */