Use testpmd command examples to quickly test the UPF offload capability of the Napatech SmartNIC running Napatech Link-Inline™ Software.
UPF offload test setup
This figure shows a test setup example which can be used with provided testpmd commands where traffic on uplink is received on port 0, and traffic on downlink is received on port 1 of the SmartNIC.
Port 0 receives traffic on the N3 interface carrying GTPv1-U tunneled packets, and port 1 receives traffic on the N6 interface carrying IP packets. For received frames on each direction, the provided testpmd example configures the SmartNIC to perform the following actions:
| Offload feature | Port 0 (uplink) | Port 1 (downlink) | |
|---|---|---|---|
| Matched flows (frames with specified IP addresses and UDP port numbers) | Policing and metering | Drop if exceeds the maximum bit rate. | Drop if exceeds the maximum bit rate. |
| Protocol encapsulation and decapsulation | GTPv1-U decapsulation and MAC encapsulation. | MAC decapsulation and GTPv1-U encapsulation. | |
| DSCP tagging | Modify the DSCP field. | Modify the DSCP field of the inner layer. | |
| NAT | Modify source IP / UDP port. | Modify destination IP / UDP port of the inner layer. | |
| Decrementing IP TTL | Decrement IP TTL. | - | |
| IP fragmentation | Fragment if exceeds the MTU. | Fragment if exceeds the MTU. | |
| Unmatched flows (the rest frames) | RSS | Distribute to queue 0, 1, 2 and 3. | Distribute to queue 4, 5, 6 and 7. |
Note: If GTPv1-U encapsulation is performed, IPv4 TTL or IPv6 hope limit are set when the
GTP header is added.