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IXP400 Software
Access-Layer Components: HSS-Access (IxHssAcc) API
April 2005 IXP400 Software Version 2.0 Programmer’s Guide
208 Document Number: 252539, Revision: 007
1. The client presents an IXP_BUF to IxHssAcc for transmission.
2. IxHssAcc gets a transmit descriptor from its transmit descriptor pool, fills in the descriptor,
and writes the address of the descriptor to the Tx queue.
3. The NPE reads a transmit descriptor from the Tx queue and transmits the data on the HSS port.
4. On completion of transmission, the NPE writes the descriptor to the TxDone queue.
5. IxHssAcc is triggered by this action, and the registered callback is executed. The descriptor is
freed internally.
6. IxHssAcc initiates the TxDoneCallback on the client, passing it back its IXP_BUF pointer.
13.6.3 Packetized Rx
Before packetized service is enabled, the Rx queue in the IxHssAcc component has to be
replenished. This can be done by calling IX_OSAL_MBUF_POOL_GET() to get an IXP_BUF and
calling ixHssAccPktPortRxFreeReplenish() to put the buffer into the queue. This is repeated until
the queue is full.
Figure 65. Packetized Transmit
B2392-02
HSS Port
Application Level
Packetized
Client
IxHssAcc
IxQMgr
NPE A
Access Layer
NPE
Physical Interface
1. ixHssAccPktPortTx
( hssPortId, hdlcPortId, *mBuf
for transmit data)
2. Descriptor to Tx queue
3. NPE reads data from pointer
in Tx queue, transmits data
on HSS port.
4. Move descriptor to TxDone
queue
5. ixHssAccPktTxDoneCallback
(*mBuf, numHssErrs,
pktStatus, txDoneUserId)