netdev - Re: [RFC PATCH bpf-next] bpf: Introduce bpf

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Date:   Wed, 2 Jun 2021 10:54:36 -0700
From:   Martin KaFai Lau <kafai@...com>
To:     Toke Høiland-Jørgensen <toke@...hat.com>
CC:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        David Miller <davem@...emloft.net>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Lorenz Bauer <lmb@...udflare.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>, kernel-team <kernel-team@...com>
Subject: Re: [RFC PATCH bpf-next] bpf: Introduce bpf_timer

On Wed, Jun 02, 2021 at 10:48:02AM +0200, Toke Høiland-Jørgensen wrote:
> Alexei Starovoitov <alexei.starovoitov@...il.com> writes:
> 
> >> > In general the garbage collection in any form doesn't scale.
> >> > The conntrack logic doesn't need it. The cillium conntrack is a great
> >> > example of how to implement a conntrack without GC.
> >> 
> >> That is simply not a conntrack. We expire connections based on
> >> its time, not based on the size of the map where it residents.
> >
> > Sounds like your goal is to replicate existing kernel conntrack
> > as bpf program by doing exactly the same algorithm and repeating
> > the same mistakes. Then add kernel conntrack functions to allow list
> > of kfuncs (unstable helpers) and call them from your bpf progs.
> 
> FYI, we're working on exactly this (exposing kernel conntrack to BPF).
> Hoping to have something to show for our efforts before too long, but
> it's still in a bit of an early stage...
Just curious, what conntrack functions will be made callable to BPF?