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scsi: scsi_debug: Implement the IO Advice Hints Grouping mode page

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Implement an IO Advice Hints Grouping mode page with three permanent
streams. A permanent stream is a stream for which the device server does
not allow closing or otherwise modifying the configuration of that
stream. The stream identifier enable (ST_ENBLE) bit specifies whether
the stream identifier may be used in the GROUP NUMBER field of SCSI
WRITE commands.

Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Tested-by: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20240130214911.1863909-18-bvanassche@acm.org
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Bart Van Assche 2024-01-30 13:48:43 -08:00 committed by Martin K. Petersen
parent b952eb270d
commit f8ab271017
1 changed files with 58 additions and 3 deletions
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61
drivers/scsi/scsi_debug.c
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@ -1969,7 +1969,11 @@ static int resp_inquiry(struct scsi_cmnd *scp, struct sdebug_dev_info *devip)
arr[4] = 0x5; /* SPT: GRD_CHK:1, REF_CHK:1 */
else
arr[4] = 0x0; /* no protection stuff */
arr[5] = 0x7; /* head of q, ordered + simple q's */
/*
* GROUP_SUP=1; HEADSUP=1 (HEAD OF QUEUE); ORDSUP=1
* (ORDERED queuing); SIMPSUP=1 (SIMPLE queuing).
*/
arr[5] = 0x17;
} else if (0x87 == cmd[2]) { /* mode page policy */
arr[3] = 0x8; /* number of following entries */
arr[4] = 0x2; /* disconnect-reconnect mp */
@ -2559,6 +2563,40 @@ static int resp_ctrl_m_pg(unsigned char *p, int pcontrol, int target)
return sizeof(ctrl_m_pg);
}
/* IO Advice Hints Grouping mode page */
static int resp_grouping_m_pg(unsigned char *p, int pcontrol, int target)
{
/* IO Advice Hints Grouping mode page */
struct grouping_m_pg {
u8 page_code; /* OR 0x40 when subpage_code > 0 */
u8 subpage_code;
__be16 page_length;
u8 reserved[12];
struct scsi_io_group_descriptor descr[MAXIMUM_NUMBER_OF_STREAMS];
};
static const struct grouping_m_pg gr_m_pg = {
.page_code = 0xa | 0x40,
.subpage_code = 5,
.page_length = cpu_to_be16(sizeof(gr_m_pg) - 4),
.descr = {
{ .st_enble = 1 },
{ .st_enble = 1 },
{ .st_enble = 1 },
{ .st_enble = 1 },
{ .st_enble = 1 },
{ .st_enble = 0 },
}
};
BUILD_BUG_ON(sizeof(struct grouping_m_pg) !=
16 + MAXIMUM_NUMBER_OF_STREAMS * 16);
memcpy(p, &gr_m_pg, sizeof(gr_m_pg));
if (1 == pcontrol) {
/* There are no changeable values so clear from byte 4 on. */
memset(p + 4, 0, sizeof(gr_m_pg) - 4);
}
return sizeof(gr_m_pg);
}
static int resp_iec_m_pg(unsigned char *p, int pcontrol, int target)
{ /* Informational Exceptions control mode page for mode_sense */
@ -2708,6 +2746,10 @@ static int resp_mode_sense(struct scsi_cmnd *scp,
ap = arr + offset;
}
/*
* N.B. If len>0 before resp_*_pg() call, then form of that call should be:
* len += resp_*_pg(ap + len, pcontrol, target);
*/
switch (pcode) {
case 0x1: /* Read-Write error recovery page, direct access */
if (subpcode > 0x0 && subpcode < 0xff)
@ -2742,9 +2784,20 @@ static int resp_mode_sense(struct scsi_cmnd *scp,
}
break;
case 0xa: /* Control Mode page, all devices */
if (subpcode > 0x0 && subpcode < 0xff)
switch (subpcode) {
case 0:
len = resp_ctrl_m_pg(ap, pcontrol, target);
break;
case 0x05:
len = resp_grouping_m_pg(ap, pcontrol, target);
break;
case 0xff:
len = resp_ctrl_m_pg(ap, pcontrol, target);
len += resp_grouping_m_pg(ap + len, pcontrol, target);
break;
default:
goto bad_subpcode;
len = resp_ctrl_m_pg(ap, pcontrol, target);
}
offset += len;
break;
case 0x19: /* if spc==1 then sas phy, control+discover */
@ -2778,6 +2831,8 @@ static int resp_mode_sense(struct scsi_cmnd *scp,
len += resp_caching_pg(ap + len, pcontrol, target);
}
len += resp_ctrl_m_pg(ap + len, pcontrol, target);
if (0xff == subpcode)
len += resp_grouping_m_pg(ap + len, pcontrol, target);
len += resp_sas_sf_m_pg(ap + len, pcontrol, target);
if (0xff == subpcode) {
len += resp_sas_pcd_m_spg(ap + len, pcontrol, target,