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: <5c6323fc-e147-457a-98ae-df1d1fa7cd7e@gmail.com>
Date: Tue, 3 Jun 2025 21:18:51 +0700
From: Bui Quang Minh <minhquangbui99@...il.com>
To: Maciej Fijalkowski <maciej.fijalkowski@...el.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 6/2/25 22:55, Maciej Fijalkowski wrote:
> 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.

Thanks, I'll take a look at it and try to use it for selftest if 
possible in next version.

Quang Minh.