The application can accelerate processing of received frames and generated flow info
records using the user-defined flow ID.
Metadata and flow ID
Complete metadata for each flow shall be stored and managed in the host with the following
- PCIe bandwidth: The amount of traffic to be delivered to the host is bound to the PCIe
- Scalability: It is easier to extend memory in the host than in the SmartNIC.
- Flexibility: The application can update each flow record in the host without updating
While complete flow metadata is stored in the host, absolutely necessary flow information
is collected and stored in the SmartNIC flow table. To associate flow information in the
SmartNIC flow table and in the host flow table, a user-defined flow ID is provided when
frames and flow info records are delivered from the SmartNIC to the host as shown in the
The flow ID of each flow can be programmed in the 64-bit id
field of the
structure when learning a flow. The 64-bit flow ID can be
configured as the pointer to a flow metadata in the host flow table. The SmartNIC includes
the flow ID when delivering every frame and every flow info record to the application. The
application can then easily access the associated flow metadata as the flow ID (of frames
and flow info records) refers directly to the entry in the host flow table.
color1 field of dynamic packet descriptor 4 contains a flow ID.
Note: Set the ColorBits parameter to FlowID
in NTPL to enable flow IDs of received frames.
See the following sections for more information about flow IDs.