HP-UX Reference (11i v2 04/09) - 7 Device (Special) Files, 9 General Information, Index (vol 10)

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scsi_ctl(7) scsi_ctl(7)

xfer_rate, max_width, max_reqack_offset

, max_xfer_rate

ﬁelds only apply to parallel SCSI.

Bus communication parameters may be managed by use of the

SIOC_GET_BUS_PARMS

SIOC_SET_BUS_LIMITS

, and SIOC_GET_BUS_LIMITS

ioctls to any associated

LUN.

The SIOC_GET_BUS_PARMS

ioctl indicates the current bus communication parameter values. The

max_width ﬁeld indicates the maximum data transfer width that will be attempted for data transfers to

any target device connected to the associated bus. The

max_reqack_offset

ﬁeld indicates the max-

imum number of outstanding

REQs that will be attempted during data transfers to any target device con-

nected to the associated bus. The max_xfer_rate

ﬁeld indicates the maximum ‘‘burst’’ data transfer

rate that will be attempted for data transfers to any target device connected to the associated bus.

The

SIOC_SET_BUS_LIMITS

ioctl speciﬁes the bus communication parameter limit suggestions for tar-

gets connected to the associated bus. The

max_width

ﬁeld speciﬁes the suggested maximum data

transfer width that should be attempted for data transfers to any target device connected to the associ-

ated bus. The

max_reqack_offset

ﬁeld speciﬁes the maximum number of outstanding

REQs that

should be attempted during data transfers to any target device connected to the associated bus. The

max_xfer_rate

ﬁeld speciﬁes the maximum synchronous ‘‘burst’’ data transfer rate that should be

attempted for data transfers to any target device connected to the associated bus. The

SIOC_GET_BUS_LIMITS

ioctl indicates the current bus communication parameter limit suggestions.

The

max_width, max_reqack_offset

and max_xfer_rate

ﬁelds only apply to parallel SCSI.

The following is included from <sys/scsi.h>:

/* SCSI communication parameter ioctls */

#define SIOC_GET_LUN_PARMS _IOR(’S’, 58, struct sioc_lun_parms)

#define SIOC_GET_TGT_PARMS _IOR(’S’, 59, struct sioc_tgt_parms)

#define SIOC_GET_BUS_PARMS _IOR(’S’, 60, struct sioc_bus_parms)

#define SIOC_GET_LUN_LIMITS _IOR(’S’, 61, struct sioc_lun_limits)

#define SIOC_GET_TGT_LIMITS _IOR(’S’, 62, struct sioc_tgt_limits)

#define SIOC_GET_BUS_LIMITS _IOR(’S’, 63, struct sioc_bus_limits)

#define SIOC_SET_LUN_LIMITS _IOW(’S’, 64, struct sioc_lun_limits)

#define SIOC_SET_TGT_LIMITS _IOW(’S’, 65, struct sioc_tgt_limits)

#define SIOC_SET_BUS_LIMITS _IOW(’S’, 66, struct sioc_bus_limits)

struct sioc_lun_parms {

unsigned int flags;

unsigned int max_q_depth; /* maximum active I/O’s */

unsigned int reserved[4]; /* reserved for future use */

};

struct sioc_lun_limits {

unsigned int flags;

unsigned int max_q_depth;

unsigned int reserved[4]; /* reserved for future use */

};

struct sioc_tgt_parms {

unsigned int flags;

unsigned int width; /* bits */

unsigned int reqack_offset;

unsigned int xfer_rate; /* bytes/sec */

unsigned int reserved[4]; /* reserved for future use */

};

struct sioc_tgt_limits {

unsigned int flags;

unsigned int max_reqack_offset;

unsigned int max_xfer_rate; /* bytes/sec */

unsigned int max_width; /* bits */

unsigned int reserved[4]; /* reserved for future use */

};

struct sioc_bus_parms {

unsigned int flags; /* reserved for future use */

unsigned int max_width;

unsigned int max_reqack_offset;

Section 7−−136 Hewlett-Packard Company − 3 − HP-UX 11i Version 2: September 2004