Intel IXP400 manual Document Number 252539, Revision 207

Intel® IXP400 Software

Access-Layer Components: HSS-Access (IxHssAcc) API

When the transmission is done, the TxDone call back function, registered with ixHssAccPktPortConnect(), is called, and the buffer can be returned to IXP_BUF pool using IX_OSAL_MBUF_POOL_PUT_CHAIN().

The following is example Tx code showing how to send an IXP_BUF:

IX_OSAL_MBUF *txBuffer;

IX_OSAL_MBUF *txBufferChain = NULL; // get a IX_OSAL_MBUF(IXP_BUF)

IX_OSAL_MBUF_POOL_GET(poolId, &txBuffer); // set the data length in the buffer

IX_OSAL_MBUF_MLEN(txBuffer) = NumberOfBytesToSend; /* set the values to transmit */

for (byteIndex = 0; byteIndex < IX_OSAL_MBUF_MLEN(txBuffer); byteIndex++)

((UINT8 *)IX_OSAL_MBUF_MDATA(txBuffer))[byteIndex] =userData[byteIndex];

//send the buffer out

ixHssAccPktPortTx (hssPortId, hdlcPortId, txBuffer);

The following is example Tx code showing how to chain IXP_BUFs together:

IX_OSAL_MBUF *txBufferChain = NULL; IX_OSAL_MBUF *lastBuffer = NULL; if (txBufferChain == NULL)

{// the first buffer

txBufferChain = txBuffer;

/* set packet header for buffer */

IX_OSAL_MBUF_PKT_LEN(txBufferChain) = 0;

}

else

{// following buffers

IX_OSAL_MBUF_NEXT_BUFFER_IN_PKT_PTR(lastBuffer) = txBuffer;

}

// update the chain length

IX_OSAL_MBUF_PKT_LEN(txBufferChain) += IX_OSAL_MBUF_MLEN(txBuffer);

IX_OSAL_MBUF_NEXT_BUFFER_IN_PKT_PTR(txBuffer) = NULL; lastBuffer = txBuffer;

// send the bubber out

ixHssAccPktPortTx (hssPortId, hdlcPortId, txBufferChain);

The process is shown in Figure 65.

Programmer’s Guide	IXP400 Software Version 2.0	April 2005
	Document Number: 252539, Revision: 007	207