BSP Developer's Guide

VxWorks 5.5
BSP Developer’s Guide
pSpare
Expects the pointer passed into muxBind( ) as pSpare.
Restarting Protocols: stackTxRestartRtn( )
The MUX uses the stackTxRestartRtn( ) to restart protocols that had to stop
transmitting because the device was out of resources. In high-traffic situations, a
muxSend( ) can return END_ERR_BLOCK. This error return indicates that the
device is out of resources for transmitting more packets and that the protocol
should wait before trying to transmit any more packets.
When the device has determined that it has enough resources to start transmitting
again, it can call the muxTxRestart( ) function, which, in turn, calls the protocol’s
stackTxRestartRtn( ).
Your stackTxRestartRtn( ) must take the following form:
void muxTxRestart
(
void* pCookie /* Returned by muxBind() call. */
)
The parameters are:
pCookie
Expects the pointer returned as the function value of the muxBind( ) for this
protocol. This pointer identifies the device to which the MUX has bound this
protocol.
H.6.2 Network Layer to Data Link Layer Address Resolution
The MUX provides several functions for adding network layer to data link layer
address resolution functions. Resolving a network layer address into a data link
layer address is usually carried out by a separate protocol. In most IP over Ethernet
environments this is carried out by ARP (the Address Resolution Protocol).
Using the MUX any protocol/datalink can register its own address resolution
function. The functions are added and deleted by the following pair of routines:
STATUS muxAddrResFuncAdd
(
long ifType, /* Media interface type from m2Lib.h */
long protocol, /* Protocol type from RFC 1700 */
FUNCPTR addrResFunc /* Function to call. */
)
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