netdev - Re: [RFC Patch net-next] net_sched: introduce eBPF based Qdisc

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Date:   Fri, 3 Sep 2021 18:09:46 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Martin KaFai Lau <kafai@...com>
Cc:     Toke Høiland-Jørgensen <toke@...hat.com>,
        John Fastabend <john.fastabend@...il.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>, Cong Wang <cong.wang@...edance.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Jiri Pirko <jiri@...nulli.us>
Subject: Re: [RFC Patch net-next] net_sched: introduce eBPF based Qdisc

On Wed, Sep 1, 2021 at 10:45 AM Martin KaFai Lau <kafai@...com> wrote:
> _if_ it is using as a qdisc object/interface,
> the patch "looks" easier because it obscures some of the ops/interface
> from the bpf user.  The user will eventually ask for more flexibility
> and then an on-par interface as the kernel's qdisc.  If there are some
> common 'ops', the common bpf code can be shared as a library in userspace
> or there is also kfunc call to call into the kernel implementation.
> For existing kernel qdisc author,  it will be easier to use the same
> interface also.

Thanks for showing the advantages of a kernel module. And no, we
are not writing kernel modules in eBPF.

And kfunc call really sucks, it does not even guarantee a stable ABI, it
is a serious mistake you made for eBPF.

Thanks.