netdev - Re: [RFC PATCH v2 bpf-next 00/15] xdp

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Date:   Thu, 24 Oct 2019 12:13:09 +0200
From:   Toke Høiland-Jørgensen <toke@...hat.com>
To:     John Fastabend <john.fastabend@...il.com>,
        John Fastabend <john.fastabend@...il.com>,
        Toshiaki Makita <toshiaki.makita1@...il.com>,
        John Fastabend <john.fastabend@...il.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        Pravin B Shelar <pshelar@....org>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org,
        William Tu <u9012063@...il.com>,
        Stanislav Fomichev <sdf@...ichev.me>
Subject: Re: [RFC PATCH v2 bpf-next 00/15] xdp_flow: Flow offload to XDP

John Fastabend <john.fastabend@...il.com> writes:

> Toke Høiland-Jørgensen wrote:
>> John Fastabend <john.fastabend@...il.com> writes:
>> 
>> > I think for sysadmins in general (not OVS) use case I would work
>> > with Jesper and Toke. They seem to be working on this specific
>> > problem.
>> 
>> We're definitely thinking about how we can make "XDP magically speeds up
>> my network stack" a reality, if that's what you mean. Not that we have
>> arrived at anything specific yet...
>
> There seemed to be two thoughts in the cover letter one how to make
> OVS flow tc path faster via XDP. And the other how to make other users
> of tc flower software stack faster.
>
> For the OVS case seems to me that OVS should create its own XDP
> datapath if its 5x faster than the tc flower datapath. Although
> missing from the data was comparing against ovs kmod so that
> comparison would also be interesting. This way OVS could customize
> things and create only what they need.
>
> But the other case for a transparent tc flower XDP a set of user tools
> could let users start using XDP for this use case without having to
> write their own BPF code. Anyways I had the impression that might be
> something you and Jesper are thinking about, general usability for
> users that are not necessarily writing their own network.

Yeah, you are right that it's something we're thinking about. I'm not
sure we'll actually have the bandwidth to implement a complete solution
ourselves, but we are very much interested in helping others do this,
including smoothing out any rough edges (or adding missing features) in
the core XDP feature set that is needed to achieve this :)

-Toke