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IXP400 Software
Access-Layer Components: ATM Manager (IxAtmm) API
April 2005 IXP400 Software Version 2.0 Programmer’s Guide
76 Document Number: 252539, Revision: 007
information to the IxAtmDAcc component, as required to drive the transmit function. As a result,
all data buffers in the system — once configured — will pass directly through IxAtmdAcc to the
appropriate clients. No data traffic will pass through the IxAtmm component at any stage.
Only transmit traffic — which has already been queued by the client with IxAtmdAcc when the
request for more traffic is made — will be scheduled and sent to the hardware. (That is, no callback
to the data client will be made in the context of the transmit processing.) IxAtmdAcc makes
IxAtmSch aware of the existence of this pending traffic when it is queued by the client through the
use of a previously registered callback interface.
The supply of empty buffers to the hardware — for use in the receive direction — is the
responsibility of the individual client on each active VC. As a result, the target callback for this
event on each VC is outside of the visibility of the IxAtmm component, being part of the client
logic. It is the responsibility of each client, therefore, to ensure that the supply mechanism of free
buffers for receive processing is configured correctly before traffic may begin passing on the
system.
Figure 23. Configuration of Traffic Control Mechanism
IxAtmm
Initialization
Client
Data
Clients
Port
Initialization
Tx Perform
RxLo Config
RxHi Config
TxDone Config
TxConfig
Timer
Intel
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IXP4XX/IXC1100 Hardware
Tx
RxLo
IxAtmSch
SchTable
Tx
Configuration
Callback Source
Data Path
TxDone
RxHi
RxLo
IxAtmdAcc
TxDone
RxHi
RxLo
B2293-01