Re: [PATCH bpf-next v3 0/3] Add more bpf_*_ct_lookup() selftests

Re: [PATCH bpf-next v3 0/3] Add more bpf_*_ct_lookup() selftests

[Kumar Kartikeya Dwivedi]

On Thu, 11 Aug 2022 at 01:16, Daniel Xu <dxu@dxuuu.xyz> wrote:
>
> This patchset adds more bpf_*_ct_lookup() selftests. The goal is to test
> interaction with netfilter subsystem as well as reading from `struct
> nf_conn`. The first is important when migrating legacy systems towards
> bpf. The latter is important in general to take full advantage of
> connection tracking.
>

Thank you for contributing these tests. Feel free to add:
Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>

People often look at selftests for usage examples these days, so it's
great to have coverage + examples for more use cases.

> I'll follow this patchset up with support for writing to `struct nf_conn`.
>

Please also cc netfilter-devel, netdev, Pablo, and Florian when you send it.

I think we can directly enable stores to ct->mark, since that is what
ctnetlink is doing too, so adding another helper for this would be
unnecessary overhead.


> Past discussion:
> - v2: https://lore.kernel.org/bpf/cover.1660062725.git.dxu@dxuuu.xyz/
> - v1: https://lore.kernel.org/bpf/cover.1659209738.git.dxu@dxuuu.xyz/
>
> Changes since v2:
> - Add bpf-ci kconfig changes
>
> Changes since v1:
> - Reword commit message / cover letter to not mention connmark writing
>
>
> Daniel Xu (3):
>   selftests/bpf: Add existing connection bpf_*_ct_lookup() test
>   selftests/bpf: Add connmark read test
>   selftests/bpf: Update CI kconfig
>
>  tools/testing/selftests/bpf/config            |  2 +
>  .../testing/selftests/bpf/prog_tests/bpf_nf.c | 60 +++++++++++++++++++
>  .../testing/selftests/bpf/progs/test_bpf_nf.c | 21 +++++++
>  3 files changed, 83 insertions(+)
>
> --
> 2.37.1
>

Re: [PATCH bpf-next v3 0/3] Add more bpf_*_ct_lookup() selftests

[Daniel Xu]

Hi Kumar,

On Wed, Aug 10, 2022, at 6:25 PM, Kumar Kartikeya Dwivedi wrote:
> On Thu, 11 Aug 2022 at 01:16, Daniel Xu <dxu@dxuuu.xyz> wrote:
>>
>> This patchset adds more bpf_*_ct_lookup() selftests. The goal is to test
>> interaction with netfilter subsystem as well as reading from `struct
>> nf_conn`. The first is important when migrating legacy systems towards
>> bpf. The latter is important in general to take full advantage of
>> connection tracking.
>>
>
> Thank you for contributing these tests. Feel free to add:
> Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
>
> People often look at selftests for usage examples these days, so it's
> great to have coverage + examples for more use cases.

I also want this interaction to still work when I start using it later :).

>
>> I'll follow this patchset up with support for writing to `struct nf_conn`.
>>
>
> Please also cc netfilter-devel, netdev, Pablo, and Florian when you send it.
>

Ack.

> I think we can directly enable stores to ct->mark, since that is what
> ctnetlink is doing too, so adding another helper for this would be
> unnecessary overhead.

Ack.

[...]

Thanks,
Danel