CIO_GET_FASTWRT (Get Fast Write) sol_ioctl Serial Optical Link Device Handler Operation

Kernel and Subsystems Technical Reference, Volume 2

CIO_GET_FASTWRT (Get Fast Write) sol_ioctl Serial Optical Link Device Handler Operation

Purpose

Provides the attributes of the sol_fastwrt entry point.

Description

The CIO_GET_FASTWRT operation provides the attributes of the Serial Optical Link (SOL) device driver's sol_fastwrt entry point.

For the CIO_GET_FASTWRT operation, the arg parameter points to the cio_get_fastwrt structure. This structure is defined in the /usr/include/sys/comio.h file and contains the following fields:

`status`	Returns one of the following possible status values: CIO_OK CIO_INV_CMD
`fastwrt_fn`	Specifies the function address that can be called to issue a fast path write.
`chan`	Specifies the channel number assigned by the device driver's mpx routine.
`devno`	Specifies major and minor device numbers for the device driver, also known as the dev_t.

Return Values

EACCES	Illegal call from kernel user.
EFAULT	Indicates that an address was not valid.
EINVAL	Indicates that a parameter was not valid.
ENODEV	Indicates that a minor number was not valid.

Implementation Specifics

The CIO_GET_FASTWRT operation works with a Serial Link Adapter and Serial Optical Channel Converter that have been correctly configured for use on a qualified network. Consult hardware specifications for more information on configuring hardware and network qualifications.

Related Information

The sol_fastwrt entry point, sol_ioctl entry point, sol_write entry point.

The CIO_START sol_ioctl Serial Optical Link Device Handler Operation.