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

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Message-ID: <CAM_iQpWP_kvE58Z+363n+miTQYPYLn6U4sxMKVaDvuRvjJo_Tg@mail.gmail.com>
Date:   Tue, 31 Aug 2021 21:39:01 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Martin KaFai Lau <kafai@...com>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        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 Tue, Aug 24, 2021 at 4:47 PM Martin KaFai Lau <kafai@...com> wrote:
> Please explain more on this.  What is currently missing
> to make qdisc in struct_ops possible?

I think you misunderstand this point. The reason why I avoid it is
_not_ anything is missing, quite oppositely, it is because it requires
a lot of work to implement a Qdisc with struct_ops approach, literally
all those struct Qdisc_ops (not to mention struct Qdisc_class_ops).
WIth current approach, programmers only need to implement two
eBPF programs (enqueue and dequeue).

Thanks.