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Improve commands parsing and allow uniform LBA decoding as well as changing LBA and transfer length in uniform manner.

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git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@4224 d57e44dd-8a1f-0410-8b47-8ef2f437770f
This commit is contained in:
Vladislav Bolkhovitin
2012-04-25 03:11:23 +00:00
parent 930135ee7b
commit 1d2a7e3364
11 changed files with 1586 additions and 894 deletions
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doc/scst_user_spec.sgml
+20 -2
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@@ -10,7 +10,7 @@ SCST user space device handler module interface descrition
<name>Vladislav Bolkhovitin</name>
</author>
<date>Version 2.1.0</date>
<date>Version 3.0.0</date>
<toc>
@@ -380,6 +380,7 @@ struct scst_user_scsi_cmd_reply_parse
uint8_t queue_type;
uint8_t data_direction;
uint16_t cdb_len;
aligned_i64 lba;
uint32_t op_flags;
int32_t data_len;
int32_t bufflen;
@@ -401,13 +402,17 @@ where:
<item> <bf/cdb_len/ - length of CDB
<item> <bf/lba/ - LBA of the command, if any
<item> <bf/op_flags/ - commands flags, one or more scst_cdb_flags bits, see above.
At least SCST_INFO_VALID must be set for correct processing.
SCST_IMPLICIT_HQ not implemented (yet) for single stage init target
drivers (all, except iSCSI), because custom parse can reorder
commands due to multithreaded processing.
<item> <bf/data_len/ - command's data length
<item> <bf/data_len/ - command's data length. Could be different from bufflen for
commands like VERIFY, which transfer different amount of data, than
process, or even none of them
<item> <bf/bufflen/ - command's buffer length
@@ -699,8 +704,11 @@ struct scst_user_scsi_cmd_parse
uint8_t cdb[SCST_MAX_CDB_SIZE];
uint16_t cdb_len;
aligned_i64 lba;
uint32_t timeout;
int32_t bufflen;
int32_t data_len;
int32_t out_bufflen;
uint32_t op_flags;
@@ -726,10 +734,16 @@ where:
<item> <bf/cdb_len/ - SCSI CDB length
<item> <bf/lba/ - LBA of the command, if any
<item> <bf/timeout/ - CDB execution timeout
<item> <bf/bufflen/ - command's buffer length
<item> <bf/data_len/ - command's data length. Could be different from bufflen for
commands like VERIFY, which transfer different amount of data, than
process, or even none of them
<item> <bf/out_bufflen/ - for bidirectional commands command's OUT, i.e. from
initiator to target, buffer length
@@ -920,6 +934,8 @@ struct scst_user_scsi_cmd_exec
uint8_t cdb[SCST_MAX_CDB_SIZE];
uint16_t cdb_len;
aligned_i64 lba;
int32_t data_len;
int32_t bufflen;
int32_t alloc_len;
@@ -949,6 +965,8 @@ where:
<item> <bf/cdb_len/ - SCSI CDB length
<item> <bf/lba/ - LBA of the command, if any
<item> <bf/data_len/ - command's data length. Could be different from bufflen for
commands like VERIFY, which transfer different amount of data, than
process, or even none of them