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lib: Parse sense specific descriptor

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Extend struct scsi_sense with sense specific descriptor information,
introduce the function scsi_parse_sense_data() and let that function
parse the sense specific descriptor.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
This commit is contained in:
Bart Van Assche
2015-04-21 14:13:15 +02:00
committed by Ronnie Sahlberg
parent fbc87ab12f
commit 8435f9722e
5 changed files with 72 additions and 28 deletions
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72
lib/iscsi-command.c
View File

@@ -340,6 +340,62 @@ iscsi_scsi_command_async(struct iscsi_context *iscsi, int lun,
return 0;
}
/* Parse a sense key specific sense data descriptor */
static void parse_sense_spec(struct scsi_sense *sense, const uint8_t inf[3])
{
if (!(inf[0] & 0x80)) /* SKSV */
return;
sense->sense_specific = 1;
sense->ill_param_in_cdb = !!(inf[0] & 0x40); /* C/D flag */
if (inf[0] & 8) { /* BPV */
sense->bit_pointer_valid = 1;
sense->bit_pointer = inf[0] & 7;
}
sense->field_pointer = scsi_get_uint16(&inf[1]);
}
/* Parse descriptor format sense data */
static void parse_sense_descriptors(struct scsi_sense *sense, const uint8_t *sb,
unsigned sb_len)
{
const unsigned char *p, *const end = sb + sb_len;
for (p = sb; p < end; p += p[1]) {
if (p[1] < 4) /* length */
break;
if (!(p[2] & 0x80)) /* VALID bit */
break;
switch (p[0]) {
case 2:
/* Sense key specific sense data descriptor */
parse_sense_spec(sense, p + 4);
break;
}
}
}
void scsi_parse_sense_data(struct scsi_sense *sense, const uint8_t *sb)
{
sense->error_type = sb[0] & 0x7f;
switch (sense->error_type) {
case 0x70:
case 0x71:
/* Fixed format */
sense->key = sb[2] & 0x0f;
sense->ascq = scsi_get_uint16(&sb[12]);
parse_sense_spec(sense, sb + 15);
break;
case 0x72:
case 0x73:
/* Descriptor format */
sense->key = sb[1] & 0x0f;
sense->ascq = scsi_get_uint16(&sb[2]);
parse_sense_descriptors(sense, sb + 8, sb[7]);
break;
}
}
int
iscsi_process_scsi_reply(struct iscsi_context *iscsi, struct iscsi_pdu *pdu,
struct iscsi_in_pdu *in)
@@ -416,21 +472,7 @@ iscsi_process_scsi_reply(struct iscsi_context *iscsi, struct iscsi_pdu *pdu,
}
memcpy(task->datain.data, in->data, task->datain.size);
task->sense.error_type = task->datain.data[2] & 0x7f;
switch (task->sense.error_type) {
case 0x70:
case 0x71:
task->sense.key = task->datain.data[4] & 0x0f;
task->sense.ascq = scsi_get_uint16(
&(task->datain.data[14]));
break;
case 0x72:
case 0x73:
task->sense.key = task->datain.data[3] & 0x0f;
task->sense.ascq = scsi_get_uint16(
&(task->datain.data[4]));
break;
}
scsi_parse_sense_data(&task->sense, &task->datain.data[2]);
iscsi_set_error(iscsi, "SENSE KEY:%s(%d) ASCQ:%s(0x%04x)",
scsi_sense_key_str(task->sense.key),
task->sense.key,