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scsi_ifgetcap(9f)
scsi_ifgetcap(9F) Kernel Functions scsi_ifgetcap(9F)
NAME
scsi_ifgetcap, scsi_ifsetcap - get/set SCSI transport capability
SYNOPSIS
#include <sys/scsi/scsi.h>
int scsi_ifgetcap(struct scsi_address *ap, char *cap, int whom);
int scsi_ifsetcap(struct scsi_address *ap, char *cap, int value,
int whom);
INTERFACE LEVEL
Solaris DDI specific (Solaris DDI).
PARAMETERS
ap Pointer to the scsi_address structure.
cap Pointer to the string capability identifier.
value Defines the new state of the capability.
whom Specifies the class of a capability.
DESCRIPTION
The scsi_ifsetcap() function is used by target drivers to set the capa‐
bilities of the host adapter driver. The cap pointer is a name-value
pair identified by a null-terminated character string and the integer
value of the cap. The current value of the capability can be retrieved
with the scsi_ifgetcap() function.
The argument whom is used to specify the class of the cap argument. The
whom argument value 0, is deprecated. Supported values for whom are as
follows:
SCSI_IFCAP_WHOM_TARGET Target end device characteristics associ‐
ated with the HBA operation. The
scsi_address structure pointed to by the
ap argument identifies the target. Capa‐
bilities of this type of result involve
tran_getcap() and tran_setcap() function
calls. For more information, see the
tran_getcap(9E) man page.
SCSI_IFCAP_WHOM_TARGET_DRV Target driver supported characteristics.
The scsi_address structure pointed to by
the ap argument identifies the target.
Capabilities of this type are stored in
SCSA framework, and do not involve
tran_getcap() or tran_setcap() function
calls. For more information, see the
tran_getcap(9E) man page.
Note -
The SCSI_IFCAP_WHOM_TARGET and SCSI_IFCAP_WHOM_TARGET_DRV interfaces
are currently private. Therefore, information related to these will
not appear in man(1) output.
The driver should confirm that scsi_ifsetcap() and scsi_ifsetcap()
functions are called with a cap that points to a capability which is
supported by the device.
The following capabilities have been defined:
dma-max Maximum dma transfer size that is supported by
the host adapter.
dma-max-arch Maximum dma transfer size that is supported by
system. Takes the host adapter and system
architecture into account. This is useful for
target drivers which do not support partial
DMAs on systems which do not have an IOMMU. In
this case, the DMA can also be limited by the
host adapters "scatter/gather" list con‐
straints.
The "dma-max-arch" capability can not be set.
It is implemented with this command and does
not rely on a tran_getcap(9E) response from the
HBA.
msg-out Message out capability that is supported by the
host adapter: 0 disables, 1 enables.
disconnect Disconnect capability that is supported by the
host adapter: 0 disables, 1 enables.
synchronous Synchronous data transfer capability that is
supported by the host adapter: 0 disables, 1
enables.
wide-xfer Wide transfer capability that is supported by
the host adapter: 0 disables, 1 enables.
parity Parity checking capability that is supported by
host adapter: 0 disables, 1 enables.
initiator-id Host bus address that is returned.
untagged-qing Host adapter capability that supports internal
queueing of commands without tagged queueing: 0
disables, 1 enables.
tagged-qing Host adapter capability that supports queuing:
0 disables, 1 enables.
auto-rqsense Host adapter capability that supports auto
request sense on check conditions: 0 disables,
1 enables.
sector-size Capability that is set by the target driver to
inform the HBA of the granularity, in bytes, of
the DMA breakup. The HBA DMA limit structure
is set to reflect the byte total of this set‐
ting. See ddi_dma_lim_sparc(9S) or
ddi_dma_lim_x86(9S). The sector-size should be
set to the size of the physical disk sector.
The capability defaults to 512 bytes.
total-sectors Capability that is set by the target driver to
inform the HBA of the total number of sectors
on the device returned by the SCSI get capac‐
ity command. This capability must be set before
the target driver "gets" the geometry capabil‐
ity.
geometry Capability that returns the HBA geometry of a
target disk. The target driver sets the total-
sectors capability before "getting" the geome‐
try capability. The geometry is returned as a
32-bit value. The upper 16 bits represent the
number of heads per cylinder. The lower 16 bits
represent the number of sectors per track. The
geometry capability cannot be "set".
If geometry is not relevant or appropriate for
the target disk, scsi_ifgetcap() can return -1
to indicate that the geometry is not defined.
For example, if the HBA BIOS supports Logical
Block Addressing for the target disk,
scsi_ifgetcap() returns -1. Attempts to
retrieve the "virtual geometry" from the target
driver, such as the DKIOCG_VIRTGEOM ioctl, will
fail. See dkio(4I) for more information about
DKIOCG_VIRTGEOM.
reset-notification Host adapter capability that supports bus reset
notification: 0 disables, 1 enables. See
scsi_reset_notify(9F).
linked-cmds Host adapter capability that supports linked
commands: 0 disables, 1 enables.
qfull-retries Capability that enables or disables QUEUE FULL
handling. If 0, the HBA will not retry a com‐
mand when a QUEUE FULL status is returned. If
the value is greater than 0, the HBA driver
retries the command a specified number of times
at an interval determined by the qfull-retry-
interval. The range for qfull-retries is 0-255.
qfull-retry-interval Capability that sets the retry interval in mil‐
liseconds (ms) for commands completed with a
QUEUE FULL status. The range for qfull-retry-
intervals is 0-1000 ms.
lun-reset Capability that is created with a value of zero
by HBA drivers that support the RESET_LUN flag
in the tran_reset(9E) function. If it exists,
the lun-reset value can be set to 1 by target
drivers to allow the use of LOGICAL UNIT RESET
on a specific target instance. If lun-reset
does not exist or has a value of zero,
scsi_reset(9F) is prevented from passing the
RESET_LUN flag to tran_reset() function of the
HBA driver. If lun-reset exists and has a value
of 1, the tran_reset() function of the HBA
driver can be called with the RESET_LUN flag.
interconnect-type Capability held in the tran_interconnect_type
element of struct scsi_hba_tran that indicates
the HBA transport interconnect type . The inte‐
ger value of the interconnect type of the
transport is defined in the services.h header
file.
max-cdb-length Host adapter capability of the maximum sup‐
ported CDB (Command Descriptor Block) length.
The target driver asks for the capability at
attach time. If the HBA driver supports the
capability, the maximum length of the CDB is
returned in bytes. The target driver can then
use that value to determine which CDB is used
for the HBA.
If the HBA driver does not support the max-cdb-
length capability, the default value of the
target driver is used for the CDB determina‐
tion.
tran-layer-retries Transport Layer retries is support by the host
adapter: 0 disables, 1 enables.
cmd-dev-resume Target driver's capability to re-run the I/O
which is in queue when the HBA device is back
online.
cmd-path-busy Target driver's capability to support the error
recovery when host adapter is busy handling
I/O.
Note -
The cmd-dev-resume and cmd-path-busy interfaces are currently pri‐
vate. Therefore, information related to these will not appear in
man(1) output.
RETURN VALUES
The scsi_ifsetcap() function returns:
1 If the capability was successfully set to the new value.
0 If the capability is not variable.
−1 If the capability was not defined, or setting the capability
to a new value failed.
The scsi_ifgetcap() function returns the current value of a capability,
or:
−1 If the capability was not defined.
EXAMPLES
Example 1 Using scsi_ifgetcap()
if (scsi_ifgetcap(&sd->sd_address, "auto-rqsense", 1) == 1) {
un->un_arq_enabled = 1;
} else {
un->un_arq_enabled =
((scsi_ifsetcap(&sd->sd_address, "auto-rqsense", 1, 1) == 1) ?
1 : 0);
}
if (scsi_ifsetcap(&devp->sd_address, "tagged-qing", 1, 1) == 1) {
un->un_dp->options |= SD_QUEUEING;
un->un_throttle = MAX_THROTTLE;
} else if (scsi_ifgetcap(&devp->sd_address, "untagged-qing", 0) == 1) {
un->un_dp->options |= SD_QUEUEING;
un->un_throttle = 3;
} else {
un->un_dp->options &= ~SD_QUEUEING;
un->un_throttle = 1;
}
CONTEXT
These functions can be called from user, interrupt, or kernel context.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Interface StabilityCommitted
SEE ALSO
tran_reset(9E), scsi_hba_lookup_capstr(9F), scsi_reset(9F),
scsi_reset_notify(9F), ddi_dma_lim_sparc(9S), ddi_dma_lim_x86(9S),
scsi_address(9S), scsi_arq_status(9S)
Writing Device Drivers in Oracle Solaris 11.4
Oracle Solaris 11.4 28 Dec 2015 scsi_ifgetcap(9F)