netdev - Re: [PATCH bpf-next 0/7] bpf: Propagate cn to TCP

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Date:   Sat, 23 Mar 2019 22:58:16 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Lawrence Brakmo <brakmo@...com>,
        Eric Dumazet <eric.dumazet@...il.com>,
        netdev <netdev@...r.kernel.org>
Cc:     Martin Lau <kafai@...com>, Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kernel Team <Kernel-team@...com>
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.