netdev - Re: [PATCH 0/3] bpf: allow zero-initialising hash map seed

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Message-ID: <59ef80ab-4f28-5c75-c394-55fcfd9bc8ca@iogearbox.net>
Date:   Mon, 1 Oct 2018 21:12:48 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Lorenz Bauer <lmb@...udflare.com>, ast@...nel.org
Cc:     netdev@...r.kernel.org, linux-api@...r.kernel.org
Subject: Re: [PATCH 0/3] bpf: allow zero-initialising hash map seed

On 10/01/2018 12:45 PM, Lorenz Bauer wrote:
> This patch set adds a new flag BPF_F_ZERO_SEED, which allows
> forcing the seed used by hash maps to zero. This makes
> it possible to write deterministic tests.
> 
> Based on an off-list conversation with Alexei Starovoitov and
> Daniel Borkmann.
> 
> Lorenz Bauer (3):
>   bpf: allow zero-initializing hash map seed
>   tools: sync linux/bpf.h
>   tools: add selftest for BPF_F_ZERO_SEED
> 
>  include/uapi/linux/bpf.h                |  2 +
>  kernel/bpf/hashtab.c                    |  8 ++-
>  tools/include/uapi/linux/bpf.h          |  2 +
>  tools/testing/selftests/bpf/test_maps.c | 67 +++++++++++++++++++++----
>  4 files changed, 66 insertions(+), 13 deletions(-)
> 

Please respin with proper SoB for each patch and non-empty commit
description. I think patch 1 should also have a more elaborate
commit description on the use case for BPF_F_ZERO_SEED, and I
think also a better comment in the uapi header that this is only
meant for testing and not production use.

Thanks,
Daniel