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[scsi] Improve sense code parsing

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Parse the sense data to extract the reponse code, the sense key, the
additional sense code, and the additional sense code qualifier.

Originally-implemented-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2014-06-02 02:17:28 +01:00
parent d630052e6f
commit e047811c85
5 changed files with 93 additions and 19 deletions
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51
src/include/ipxe/scsi.h
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@@ -267,8 +267,8 @@ struct scsi_cmd {
size_t data_in_len;
};
/** SCSI sense data */
struct scsi_sns {
/** SCSI fixed-format sense data */
struct scsi_sns_fixed {
/** Response code */
uint8_t code;
/** Reserved */
@@ -277,8 +277,44 @@ struct scsi_sns {
uint8_t key;
/** Information */
uint32_t info;
/** Additional sense length */
uint8_t len;
/** Command-specific information */
uint32_t cs_info;
/** Additional sense code and qualifier */
uint16_t additional;
} __attribute__ (( packed ));
/** SCSI descriptor-format sense data */
struct scsi_sns_descriptor {
/** Response code */
uint8_t code;
/** Sense key */
uint8_t key;
/** Additional sense code and qualifier */
uint16_t additional;
} __attribute__ (( packed ));
/** SCSI sense data */
union scsi_sns {
/** Response code */
uint8_t code;
/** Fixed-format sense data */
struct scsi_sns_fixed fixed;
/** Descriptor-format sense data */
struct scsi_sns_descriptor desc;
};
/** SCSI sense response code mask */
#define SCSI_SENSE_CODE_MASK 0x7f
/** Test if SCSI sense data is in fixed format
*
* @v code Response code
* @ret is_fixed Sense data is in fixed format
*/
#define SCSI_SENSE_FIXED( code ) ( ( (code) & 0x7e ) == 0x70 )
/** SCSI sense key mask */
#define SCSI_SENSE_KEY_MASK 0x0f
@@ -288,11 +324,18 @@ struct scsi_rsp {
uint8_t status;
/** Data overrun (or negative underrun) */
ssize_t overrun;
/** Autosense data (if any) */
struct scsi_sns sense;
/** Autosense data (if any)
*
* To minimise code size, this is stored as the first four
* bytes of a descriptor-format sense data block (even if the
* response code indicates fixed-format sense data).
*/
struct scsi_sns_descriptor sense;
};
extern int scsi_parse_lun ( const char *lun_string, struct scsi_lun *lun );
extern void scsi_parse_sense ( const void *data, size_t len,
struct scsi_sns_descriptor *sense );
extern int scsi_command ( struct interface *control, struct interface *data,
struct scsi_cmd *command );