Question about add ethdev loopback set API

[Ferruh Yigit]

On 12/13/2022 10:04 AM, fengchengwen wrote:
> Hi Ferruh,
> 
>     During the test, we need to delineate where go wrong when encountered
> e.g. CRC error. In this scenario, loopback is useful.
> 
>     I think we can add a loopback set API which could set inner or outer loop,
> and user can use telemetry to set the loopback in the above scenario.
> 
>     I'd like to hear your opinion about add a loopback set API.
> 

Hi Chengwen,

Is the intention to test ethdev layer or driver?

It is possible to use ring vdev to create a loopback and to test ethdev
layer.

For driver, it can be possible to create physical loopback connection,
or even can implement loopback Rx/Tx burst functions in driver.
Using another host to send/receive packets to DUT (device under test) is
another approach.


What kind of loopback implementation do you have in your mind?