netdev - Re: [PATCH bpf-next] bpf: add read/write access to skb->tstamp from tc clsact progs

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Message-ID: <8154bb99-4454-42a7-29b7-58ae8c9e57f0@gmail.com>
Date:   Tue, 20 Nov 2018 16:49:36 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Vlad Dumitrescu <vladum@...gle.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org
Cc:     Eric Dumazet <edumazet@...gle.com>,
        Willem de Bruijn <willemb@...gle.com>
Subject: Re: [PATCH bpf-next] bpf: add read/write access to skb->tstamp from
 tc clsact progs



On 11/20/2018 04:18 PM, Vlad Dumitrescu wrote:
> This could be used to rate limit egress traffic in concert with a qdisc
> which supports Earliest Departure Time, such as FQ.
> 
> Signed-off-by: Vlad Dumitrescu <vladum@...gle.com>
> ---
>  include/uapi/linux/bpf.h                    |  1 +
>  net/core/filter.c                           | 26 +++++++++++++++++++++
>  tools/include/uapi/linux/bpf.h              |  1 +
>  tools/testing/selftests/bpf/test_verifier.c |  4 ++++
>  4 files changed, 32 insertions(+)
>

Awesome, thanks Vlad

Note that this also can be used to implement a delay (a la netem).

Acked-by: Eric Dumazet <edumazet@...gle.com>