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Date:   Sat, 23 Mar 2019 22:58:16 -0700
From:   Eric Dumazet <>
To:     Lawrence Brakmo <>,
        Eric Dumazet <>,
        netdev <>
Cc:     Martin Lau <>, Alexei Starovoitov <>,
        Daniel Borkmann <>,
        Kernel Team <>
Subject: Re: [PATCH bpf-next 0/7] bpf: Propagate cn to TCP

On 03/23/2019 06:14 PM, Lawrence Brakmo wrote:

> There was no eBPF at that time. We like the flexibility we get by programing
> the algorithms in eBPF.

eBPF being there does not mean we can adopt whatever research work,
we want evaluations of the costs and benefits.

> These are not intrusive changes, they simply extend the current limited return
> values form cgroup skb egress BPF programs to be more in line with qdiscs.

They are quite intrusive changes to IP layer, we can not deny this.

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