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Intel
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IXP400 Software
Programmer’s Guide IXP400 Software Version 2.0 April 2005
Document Number: 252539, Revision: 007 129
Access-Layer Components:
Ethernet Access (IxEthAcc) API 9
This chapter describes the Intel
®
IXP400 Software v2.0’s “Ethernet Access API” access-layer
component.
9.1 What’s New
The following changes and enhancements were made to this component in software release 2.0:
• The Ethernet subsystem has been enhanced to include support for the Intel
®
IXP46X Product
Line of Network Processors. This includes supporting the MII interface attached to NPE-A.
All enumerations and definitions reference the Ethernet port on NPE-A as Port 2, except for
the
ixp_ne_dest_port and ixp_ne_src_port IX_OSAL_MBUF fields.
Note: The Intel
®
IXP46X product line processors include an option for a 4-port SMII
capability, using four Ethernet coprocessors on NPE-B. In software release 2.0, this
functionality is not supported. On NPE-B, only a single MII interface is supported.
• New API functions have been added for enhancing Ethernet diagnostic capabilities and
forcing a hard immediate shutdown of ports in emergency security situations. These new
functions are:
— ixEthAccPortNpeLoopbackEnable(), ixEthAccPortNpeLoopbackDisable()
— ixEthAccPortTxEnable(), ixEthAccPortTxDisable()
— ixEthAccPortRxEnable(), ixEthAccPorRxDisable()
— ixEthAccPortMacReset()
• New API ixEthAccMiiAccessTimeoutSet(). This new function is used to override the default
timeout value (100ms) and retry count when reading or writing MII registers using
ixEthAccMiiWriteRtn() or ixEthAccMiiReadRtn(). This is useful to speed up read/write
operations to PHY registers.
ixEthAccMiiWriteRtn() and ixEthAccMiiReadRtn() are
unmodified, to retain backwards compatibility.
• The number of receive priority queues is now 8 for configurations where NPE microcode with
QoS-enabled Ethernet services are configured for NPE-A.
9.2 IxEthAcc Overview
The IxEthAcc component (along with its related components, IxEthDB and IxEthMii) provides
data plane, control plane, and management plane information for the Ethernet MAC devices
residing on the Intel
®
IXP4XX Product Line of Network Processors and IXC1100 Control Plane
Processor. Depending on which processor variants are being used, the Intel
®
IXP4XX product line
and IXC1100 control plane processors contain one, two, or three 10/100-Mbps Ethernet MAC
devices.