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[223.218.245.204]) by smtp.googlemail.com with ESMTPSA id d127sm2456205pfc.28.2019.10.27.06.13.23 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 27 Oct 2019 06:13:28 -0700 (PDT) From: Toshiaki Makita Subject: Re: [RFC PATCH v2 bpf-next 00/15] xdp_flow: Flow offload to XDP To: =?UTF-8?Q?Toke_H=c3=b8iland-J=c3=b8rgensen?= , John Fastabend , Alexei Starovoitov , Daniel Borkmann , Martin KaFai Lau , Song Liu , Yonghong Song , "David S. Miller" , Jakub Kicinski , Jesper Dangaard Brouer , Jamal Hadi Salim , Cong Wang , Jiri Pirko , Pablo Neira Ayuso , Jozsef Kadlecsik , Florian Westphal , Pravin B Shelar Cc: netdev@vger.kernel.org, bpf@vger.kernel.org, William Tu , Stanislav Fomichev References: <20191018040748.30593-1-toshiaki.makita1@gmail.com> <5da9d8c125fd4_31cf2adc704105c456@john-XPS-13-9370.notmuch> <22e6652c-e635-4349-c863-255d6c1c548b@gmail.com> <5daf34614a4af_30ac2b1cb5d205bce4@john-XPS-13-9370.notmuch> <87h840oese.fsf@toke.dk> Message-ID: <282d61fe-7178-ebf1-e0da-bdc3fb724e4b@gmail.com> Date: Sun, 27 Oct 2019 22:13:23 +0900 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: <87h840oese.fsf@toke.dk> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On 19/10/23 (水) 2:45:05, Toke Høiland-Jørgensen wrote: > John Fastabend 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