netdev - Re: [PATCH bpf-next 09/10] bpf: Add a helper to issue timestamp cookies in XDP

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Message-ID: <87y26nekoc.fsf@toke.dk>
Date:   Wed, 20 Oct 2021 18:16:19 +0200
From:   Toke Høiland-Jørgensen <toke@...hat.com>
To:     Lorenz Bauer <lmb@...udflare.com>,
        Maxim Mikityanskiy <maximmi@...dia.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Brendan Jackman <jackmanb@...gle.com>,
        Florent Revest <revest@...omium.org>,
        Joe Stringer <joe@...ium.io>, Tariq Toukan <tariqt@...dia.com>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        clang-built-linux@...glegroups.com
Subject: Re: [PATCH bpf-next 09/10] bpf: Add a helper to issue timestamp
 cookies in XDP

Lorenz Bauer <lmb@...udflare.com> writes:

>> +bool cookie_init_timestamp_raw(struct tcphdr *th, __be32 *tsval, __be32 *tsecr)
>
> I'm probably missing context, Is there something in this function that
> means you can't implement it in BPF?

I was about to reply with some other comments but upon closer inspection
I ended up at the same conclusion: this helper doesn't seem to be needed
at all?

-Toke