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

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Message-ID: <282d61fe-7178-ebf1-e0da-bdc3fb724e4b@gmail.com>
Date:   Sun, 27 Oct 2019 22:13:23 +0900
From:   Toshiaki Makita <toshiaki.makita1@...il.com>
To:     Toke Høiland-Jørgensen <toke@...hat.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

On 19/10/23 (水) 2:45:05, 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...
> 
> And yeah, I'd also be happy to discuss what it would take to make a
> native XDP implementation of the OVS datapath; including what (if
> anything) is missing from the current XDP feature set to make this
> feasible. I must admit that I'm not quite clear on why that wasn't the
> approach picked for the first attempt to speed up OVS using XDP...

Here's some history from William Tu et al.
https://linuxplumbersconf.org/event/2/contributions/107/

Although his aim was not to speed up OVS but to add kernel-independent 
datapath, his experience shows full OVS support by eBPF is very difficult.
Later I discussed this xdp_flow approach with William and we find value 
performance-wise in such a way of partial offloading to XDP. TC is one 
of ways to achieve the partial offloading.

Toshiaki Makita