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scsi: scsi_debug: Add compression mode page for tapes

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Add support for compression mode page. The compression status
is saved and returned. No UA is generated.

Signed-off-by: Kai Mäkisara <Kai.Makisara@kolumbus.fi>
Link: https://lore.kernel.org/r/20250213092636.2510-6-Kai.Makisara@kolumbus.fi
Reviewed-by: John Meneghini <jmeneghi@redhat.com>
Tested-by: John Meneghini <jmeneghi@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Kai Mäkisara 2025-02-13 11:26:34 +02:00 committed by Martin K. Petersen
parent 0744d3114c
commit 568354b24c
1 changed files with 33 additions and 0 deletions
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33
drivers/scsi/scsi_debug.c
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@ -405,6 +405,7 @@ struct sdebug_dev_info {
unsigned int tape_density;
unsigned char tape_partition;
unsigned char tape_nbr_partitions;
unsigned char tape_dce;
unsigned int tape_location[TAPE_MAX_PARTITIONS];
unsigned int tape_eop[TAPE_MAX_PARTITIONS];
struct tape_block *tape_blocks[TAPE_MAX_PARTITIONS];
@ -2843,6 +2844,20 @@ static int resp_partition_m_pg(unsigned char *p, int pcontrol, int target)
return sizeof(partition_pg);
}
static int resp_compression_m_pg(unsigned char *p, int pcontrol, int target,
unsigned char dce)
{ /* Compression page for mode_sense (tape) */
unsigned char compression_pg[] = {0x0f, 14, 0x40, 0, 0, 0, 0, 0,
0, 0, 0, 0, 00, 00};
memcpy(p, compression_pg, sizeof(compression_pg));
if (dce)
p[2] |= 0x80;
if (pcontrol == 1)
memset(p + 2, 0, sizeof(compression_pg) - 2);
return sizeof(compression_pg);
}
/* PAGE_SIZE is more than necessary but provides room for future expansion. */
#define SDEBUG_MAX_MSENSE_SZ PAGE_SIZE
@ -2983,6 +2998,12 @@ static int resp_mode_sense(struct scsi_cmnd *scp,
}
offset += len;
break;
case 0xf: /* Compression Mode Page (tape) */
if (!is_tape)
goto bad_pcode;
len += resp_compression_m_pg(ap, pcontrol, target, devip->tape_dce);
offset += len;
break;
case 0x11: /* Partition Mode Page (tape) */
if (!is_tape)
goto bad_pcode;
@ -3143,6 +3164,14 @@ static int resp_mode_select(struct scsi_cmnd *scp,
goto set_mode_changed_ua;
}
break;
case 0xf: /* Compression mode page */
if (sdebug_ptype != TYPE_TAPE)
goto bad_pcode;
if ((arr[off + 2] & 0x40) != 0) {
devip->tape_dce = (arr[off + 2] & 0x80) != 0;
return 0;
}
break;
case 0x1c: /* Informational Exceptions Mode page */
if (iec_m_pg[1] == arr[off + 1]) {
memcpy(iec_m_pg + 2, arr + off + 2,
@ -3158,6 +3187,10 @@ static int resp_mode_select(struct scsi_cmnd *scp,
set_mode_changed_ua:
set_bit(SDEBUG_UA_MODE_CHANGED, devip->uas_bm);
return 0;
bad_pcode:
mk_sense_invalid_fld(scp, SDEB_IN_CDB, 2, 5);
return check_condition_result;
}
static int resp_temp_l_pg(unsigned char *arr)