High Availability Software for the Intel® NetStructureTM ZT 4901 Technical Product Specification 121
HSK Device Driver Interface for VxWorks* 5.4

C.6.1 RH_HSK_RH_PROCESS_PACKET

RH_HSK_RH_PROCESS_PACKET is called when a message packet is being redirected to a
device driver for synchronization purposes. The RH driver validates the data packet header in
addition to performing a CRC-16 check of the data payload. The payload part of the packet is
driver dependent and defined by the driver developer. The RH driver confirms the validity of the
CRC-16 value within the packet without validating packet contents.
Syntax
( UINT8* pBuf, int iLen, PVOID pContext )
Parameters
pBuf
Pointer to a data packet being received from the RH driver. It is the responsibility of the device
driver to validate the packet contents. Upon returning from this callback, the RH driver deallocates
the data packet. The data packet must be smaller than 1KB. The RH driver places no restrictions on
the type of data used for two reasons:
•The RH driver has no direct knowledge of the structure of this information
•The RH driver is not required to perform any actions with this object
len
Length in bytes of the data packet being sent.
pContext
This parameter is a context value that is passed to the process packet function. This is a context free
value, which means that the value is not modified by the message routing system, and is passed in
its entirety.
Return Value
None
C.7 RH-Aware Send Message Definition
This section describes the syntax and functionality of the send message function.

C.7.1 HSI_STATUS rhHskSendMessage

This function initiates the sending of a data packet from a device driver on the Active Host to the
corresponding device driver on the Redundant Host.
Syntax
(PRH_DATA_PACKET pPacket, UINT32 iLen, PCI_LOCATION pci )
Parameters