149. Speed Capabilities Test¶

The Speed Capabilities Test checks the speeds that the device lists and compares it to a user-defined set of expected speeds set in the speed_capabilities.cfg.

149.1. Prerequisites¶

If using vfio the kernel must be >= 3.6+ and VT-d must be enabled in bios.When using vfio, use the following commands to load the vfio driver and bind it to the device under test:

modprobe vfio
modprobe vfio-pci
usertools/dpdk-devbind.py --bind=vfio-pci device_bus_id

Assuming that ports 0 and 1 of the test target are directly connected to the traffic generator, launch the testpmd application with the following arguments:

./<build_target>/app/dpdk-testpmd -- -i --portmask=0x3

Start packet forwarding in the testpmd application with the start command. Then, for each port on the target make the Traffic Generator transmit a packet to the port of arbitrary size less than the MTU of the target port, checking that the same amount of frames and bytes are received back by the Traffic Generator from the port.

Ensure that the speed_capabilities.cfg file correctly reflects the speeds the device is expected to run at.

149.2. Test Case : Speed Capabilities Test¶

Use testpmd to retrieve the speed information that the interface is linked at:
```
testpmd> show port info <PORT_ID>
```
Compares the speed value against the rate in the speed_capabilities.cfg file. The supported options for expected speeds are 1G, 10G, 25G, 40G, and 100G. Each interface must have an expected speed associated with it. Example file below:
```
[suite]
expected_speeds={'interface1': '10G', 'interface2': '100M'}
```
Verifies that the speeds matches accordingly.
Repeats the verification for each NIC and interface found on the system.