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IXP400 Software
Access-Layer Components: Ethernet Access (IxEthAcc) API
April 2005 IXP400 Software Version 2.0 Programmer’s Guide
142 Document Number: 252539, Revision: 007
9.5.3.3 Additional Receive Path Information
No Receive Polling
An Rx polling interface is not provided for the service. This can easily be extended via queuing the
received frames by the access component user and subsequently providing a polling interface.
Figure 52. Ethernet Receive Plane Data Buffer Flow
Codelet or client application
IxEthAcc
IxQMgr
1. Initializations , Callback
Registration...
2. PortRxFreeReplenish (Port 0)
PortRxFreeReplenish (Port 1)
PortRxFreeReplenish (Port 2)
4. IxEthAcc will
store extra ixp_buf
pointers if IxQMgr
port-specific free
queues are full.
6. IxQMgr dispatches
IxEthAcc callback
function, passes ixp_buf
pointers. If Receive QoS
mode, IxEthAcc will place
pointers in appropriate
Traffic Class queues.
8. RxCallback (Port 0)
RxCallback (Port 1)
RxCallback (Port 2)
FreeEnet0
FreeEnet1
3. PortEnable (Port 0)
PortEnable (Port 1)
PortEnable (Port 2)
9. Client must free buffers,
replenish PortRxFree
queues
RxEnet
Incoming
Ethernet
Frames
7. IxEthAcc dispatches
port specific callback
functions, passes
ixp_buf pointers
B2366-04
5. NPEs receive frames,
write receive traffic data,
muxes ixp_buf pointer
onto RxEnet queue, or
multiple RxEnet priority
queues, if Receive QoS
mode is enabled.
FreeEnet2
Optional Priority Queues
NPEs