linux-kernel - Re: [RFC PATCH net-next v2 2/2] selftests: net: add XDP socket tests for virtio-net

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Message-ID: <aD3JjgW2oxdal5lE@boxer>
Date: Mon, 2 Jun 2025 17:55:58 +0200
From: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
To: Bui Quang Minh <minhquangbui99@...il.com>
CC: <netdev@...r.kernel.org>, "Michael S. Tsirkin" <mst@...hat.com>, "Jason
 Wang" <jasowang@...hat.com>, Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, Eugenio
 Pérez <eperezma@...hat.com>, Andrew Lunn
	<andrew+netdev@...n.ch>, "David S. Miller" <davem@...emloft.net>, "Eric
 Dumazet" <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
	<pabeni@...hat.com>, Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann
	<daniel@...earbox.net>, Jesper Dangaard Brouer <hawk@...nel.org>, "John
 Fastabend" <john.fastabend@...il.com>, <virtualization@...ts.linux.dev>,
	<linux-kernel@...r.kernel.org>, <bpf@...r.kernel.org>
Subject: Re: [RFC PATCH net-next v2 2/2] selftests: net: add XDP socket tests
 for virtio-net

On Sat, May 31, 2025 at 03:51:57PM +0700, Bui Quang Minh wrote:
> On 5/30/25 18:45, Maciej Fijalkowski wrote:
> > On Thu, May 29, 2025 at 09:29:14PM +0700, Bui Quang Minh wrote:
> > > On 5/29/25 18:18, Maciej Fijalkowski wrote:
> > > > On Tue, May 27, 2025 at 11:19:04PM +0700, Bui Quang Minh wrote:
> > > > > This adds a test to test the virtio-net rx when there is a XDP socket
> > > > > bound to it. There are tests for both copy mode and zerocopy mode, both
> > > > > cases when XDP program returns XDP_PASS and XDP_REDIRECT to a XDP socket.
> > > > > 
> > > > > Signed-off-by: Bui Quang Minh <minhquangbui99@...il.com>
> > > > Hi Bui,
> > > > 
> > > > have you considered adjusting xskxceiver for your needs? If yes and you
> > > > decided to go with another test app then what were the issues around it?
> > > > 
> > > > This is yet another approach for xsk testing where we already have a
> > > > test framework.
> > > Hi,
> > > 
> > > I haven't tried much hard to adapt xskxceiver. I did have a look at
> > > xskxceiver but I felt the supported topology is not suitable for my need. To
> > > test the receiving side in virtio-net, I use Qemu to set up virtio-net in
> > > the guest and vhost-net in the host side. The sending side is in the host
> > > and the receiving is in the guest so I can't figure out how to do that with
> > > xskxceiver.
> > I see - couldn't the python side be executing xdpsock then instead of your
> > own app?
> 
> I'm not aware of xdpsock. Could you give the path to that file?

https://github.com/xdp-project/bpf-examples/tree/main/AF_XDP-example

this is our go-to app side of AF_XDP.

> 
> > I wouldn't like to end up with several xsk tools for testing data path on
> > different environments.