netdev - Re: [PATCH v3 0/4] bpf: allow zero-initialising hash map seed

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Date:   Fri, 16 Nov 2018 17:33:15 +0000
From:   Song Liu <songliubraving@...com>
To:     Lorenz Bauer <lmb@...udflare.com>
CC:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-api@...r.kernel.org" <linux-api@...r.kernel.org>
Subject: Re: [PATCH v3 0/4] bpf: allow zero-initialising hash map seed



> On Nov 16, 2018, at 3:41 AM, Lorenz Bauer <lmb@...udflare.com> wrote:
> 
> Allow forcing the seed of a hash table to zero, for deterministic
> execution during benchmarking and testing.
> 
> Changes from v2:
> * Change ordering of BPF_F_ZERO_SEED in linux/bpf.h
> 
> Comments adressed from v1:
> * Add comment to discourage production use to linux/bpf.h
> * Require CAP_SYS_ADMIN
> 
> Lorenz Bauer (4):
>  bpf: allow zero-initializing hash map seed
>  bpf: move BPF_F_QUERY_EFFECTIVE after map flags
>  tools: sync linux/bpf.h
>  tools: add selftest for BPF_F_ZERO_SEED
> 
> include/uapi/linux/bpf.h                |  9 ++--
> kernel/bpf/hashtab.c                    | 13 ++++-
> tools/include/uapi/linux/bpf.h          | 13 +++--
> tools/testing/selftests/bpf/test_maps.c | 68 +++++++++++++++++++++----
> 4 files changed, 84 insertions(+), 19 deletions(-)
> 
> -- 
> 2.17.1
>