Subject: Re: [PATCH v5 bpf-next 8/8] selftests/bpf: introduce XDP compliance test tool

From: Lorenzo Bianconi <[email-masked]>
Date: Fri, 3 Feb 2023 18:36:44 +0100

> On Wed, Feb 1, 2023 at 2:25 AM Lorenzo Bianconi <[email-masked]> wrote:
> >
> > Introduce xdp_features tool in order to test XDP features supported by
> > the NIC and match them against advertised ones.
> > In order to test supported/advertised XDP features, xdp_features must
> > run on the Device Under Test (DUT) and on a Tester device.
> > xdp_features opens a control TCP channel between DUT and Tester devices
> > to send control commands from Tester to the DUT and a UDP data channel
> > where the Tester sends UDP 'echo' packets and the DUT is expected to
> > reply back with the same packet. DUT installs multiple XDP programs on the
> > NIC to test XDP capabilities and reports back to the Tester some XDP stats.
> 
> 
> 'DUT installs...'? what? The device installs XDP programs ?

Hi Alexei,

DUT stands for Device Under Test, I was thinking it is quite a common term.
Sorry for that.

> 
> > +
> > +       ctrl_sockfd = accept(*sockfd, (struct sockaddr *)&ctrl_addr, &addrlen);
> > +       if (ctrl_sockfd < 0) {
> > +               fprintf(stderr, "Failed to accept connection on DUT socket\n");
> 
> Applied, but overuse of the word 'DUT' is incorrect and confusing.
> 
> 'DUT socket' ? what is that?
> 'Invalid DUT address' ? what address?
> The UX in general is not user friendly.
> 
> ./xdp_features
> Invalid ifindex
> 
> This is not a helpful message.
> 
> ./xdp_features eth0
> Starting DUT on device 3
> Failed to accept connection on DUT socket
> 
> 'Starting DUT' ? What did it start?

I will post a follow-up patch to clarify them.

Regards,
Lorenzo