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Custom commands parsing cleanups

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git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@1455 d57e44dd-8a1f-0410-8b47-8ef2f437770f
This commit is contained in:
Vladislav Bolkhovitin
2010-01-12 19:05:27 +00:00
parent e5a195516c
commit 89345ab95c
8 changed files with 237 additions and 174 deletions
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doc/scst_user_spec.txt
+35 -5
View File
@@ -2,7 +2,7 @@
USER SPACE INTERFACE DESCRIPTION.
Version 1.0.2
Version 2.0.0
I. Description.
@@ -280,7 +280,7 @@ where:
- subcode - subcommand code, see 4.1 below
- preply - pointer to the reply data or, if 0, there is no reply. See
- preply - pointer to the reply data or, if 0, there is no reply. See
SCST_USER_REPLY_CMD for description of struct scst_user_reply_cmd
fields
@@ -375,6 +375,8 @@ struct scst_user_scsi_cmd_parse
int32_t bufflen;
int32_t in_bufflen;
uint32_t op_flags;
uint8_t queue_type;
uint8_t data_direction;
@@ -403,6 +405,8 @@ where:
- in_bufflen - for bidirectional commands command's IN, i.e. from
initiator to target, buffer length
- op_flags - CDB flags, one or more scst_cdb_flags bits, see below.
- queue_type - SCSI task attribute (queue type)
- data_direction - command's data flow direction, one of SCST_DATA_*
@@ -418,6 +422,30 @@ where:
- sn - command's SN, which might be used for task management
Bits of scst_cdb_flags can be:
- SCST_TRANSFER_LEN_TYPE_FIXED - this command uses fixed blocks addressing
- SCST_SMALL_TIMEOUT - this command needs small timeout
- SCST_LONG_TIMEOUT - this command needs a long timeout
- SCST_UNKNOWN_LENGTH - data buffer lenght for this command is unknown
- SCST_INFO_VALID - bits of op_flags are valid
- SCST_VERIFY_BYTCHK_MISMATCH_ALLOWED - mismatch of data_direction with
the value supplied by target driver is allowed
- SCST_IMPLICIT_HQ - this command is an implicit HEAD OF QUEUE command
- SCST_SKIP_UA - Unit Attentions shouldn't be delivered for this command
- SCST_WRITE_MEDIUM - this command writes data on the medium, so should be
forbidden for read-only devices
- SCST_LOCAL_CMD - this command can be processed by SCST core.
In the PARSE state of SCSI commands processing the user space device
handler shall check and provide SCST values for command data buffer
length, data flow direction and timeout, which it shall reply using the
@@ -811,7 +839,8 @@ struct scst_user_scsi_cmd_reply_parse
{
uint8_t queue_type;
uint8_t data_direction;
uint8_t write_medium;
int16_t cdb_len;
uint32_t op_flags;
int32_t data_len;
int32_t bufflen;
},
@@ -822,8 +851,9 @@ where:
- data_direction - command's data flow direction, one of SCST_DATA_* constants
- write_medium - true, if command writes data to medium, so should be
forbidden for read-only devices, false otherwise
- cdb_len - length of CDB
- op_flags - commands flags, one or more scst_cdb_flags bits, see above.
- data_len - command's data length