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

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Message-ID: <20210902233510.gnimg2krwwkzv4f2@kafai-mbp.dhcp.thefacebook.com>
Date:   Thu, 2 Sep 2021 16:35:10 -0700
From:   Martin KaFai Lau <kafai@...com>
To:     Toke Høiland-Jørgensen <toke@...hat.com>
CC:     John Fastabend <john.fastabend@...il.com>,
        Cong Wang <xiyou.wangcong@...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 Fri, Sep 03, 2021 at 12:27:52AM +0200, Toke Høiland-Jørgensen wrote:
> >> The question is if it's useful to provide the full struct_ops for
> >> qdiscs? Having it would allow a BPF program to implement that interface
> >> towards userspace (things like statistics, classes etc), but the
> >> question is if anyone is going to bother with that given the wealth of
> >> BPF-specific introspection tools already available?
Instead of bpftool can only introspect bpf qdisc and the existing tc
can only introspect kernel qdisc,  it will be nice to have bpf
qdisc work as other qdisc and showing details together with others
in tc.  e.g. a bpf qdisc export its data/stats with its btf-id
to tc and have tc print it out in a generic way?