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support pre-SPC3 page 83 format

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This commit is contained in:
Kurt Garloff 2005-12-15 13:01:01 +01:00 committed by Kay Sievers
parent c756114f8e
commit cbba4a5446
1 changed files with 48 additions and 0 deletions
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48
extras/scsi_id/scsi_serial.c
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@ -558,6 +558,27 @@ static int check_fill_0x83_id(struct sysfs_device *scsi_dev,
return 0;
}
/* Extract the raw binary from VPD 0x83 pre-SPC devices */
static int check_fill_0x83_prespc3(struct sysfs_device *scsi_dev,
unsigned char *page_83,
const struct scsi_id_search_values
*id_search, char *serial, int max_len)
{
int i, j;
serial[0] = hex_str[id_search->id_type];
/* serial has been memset to zero before */
j = strlen(serial); /* j = 1; */
for (i = 0; i < page_83[3]; ++i) {
serial[j++] = hex_str[(page_83[4+i] & 0xf0) >> 4];
serial[j++] = hex_str[ page_83[4+i] & 0x0f];
}
dprintf("using pre-spc3-83 for %s.\n", scsi_dev->name);
return 0;
}
/* Get device identification VPD page */
static int do_scsi_page83_inquiry(struct sysfs_device *scsi_dev, int fd,
char *serial, int len)
@ -584,6 +605,33 @@ static int do_scsi_page83_inquiry(struct sysfs_device *scsi_dev, int fd,
* the form: "1 ".
*/
/*
* Model 4, 5, and (some) model 6 EMC Symmetrix devices return
* a page 83 reply according to SCSI-2 format instead of SPC-2/3.
*
* The SCSI-2 page 83 format returns an IEEE WWN in binary
* encoded hexi-decimal in the 16 bytes following the initial
* 4-byte page 83 reply header.
*
* Both the SPC-2 and SPC-3 formats return an IEEE WWN as part
* of an Identification descriptor. The 3rd byte of the first
* Identification descriptor is a reserved (BSZ) byte field.
*
* Reference the 7th byte of the page 83 reply to determine
* whether the reply is compliant with SCSI-2 or SPC-2/3
* specifications. A zero value in the 7th byte indicates
* an SPC-2/3 conformant reply, (i.e., the reserved field of the
* first Identification descriptor). This byte will be non-zero
* for a SCSI-2 conformant page 83 reply from these EMC
* Symmetrix models since the 7th byte of the reply corresponds
* to the 4th and 5th nibbles of the 6-byte OUI for EMC, that is,
* 0x006048.
*/
if (page_83[6] != 0)
return check_fill_0x83_prespc3(scsi_dev, page_83,
id_search_list, serial, len);
/*
* Search for a match in the prioritized id_search_list.
*/