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Date: Tue, 29 Mar 2022 13:07:37 +0200 From: Felix Fietkau <nbd@....name> To: Nikolay Aleksandrov <razor@...ckwall.org>, netdev@...r.kernel.org Subject: Re: [RFC 2/2] net: bridge: add a software fast-path implementation On 28.03.22 20:20, Nikolay Aleksandrov wrote: > On 28/03/2022 18:15, Felix Fietkau wrote: >> >> Hi Nik, >> >> I'd like to follow up on our discussion regarding bridge offloading. >> I managed to come up with a user space + eBPF implementation that replaces this code and shows mostly the same performance gain as my previous kernel space implementation. >> >> At first I tried to use generic XDP, but after getting it working, performance was pretty bad (due to headroom issues) and I was told that this is by design and nobody should use it in production. >> >> Then I reworked the code to use tc classifier instead and it worked much better. >> >> It's not fully ready yet, I need to add some more tests for incompatible features, but I'm getting there... >> The code is here: https://github.com/nbd168/bridger >> >> There's one thing I haven't been able to figure out yet: What's the proper way to keep bridge fdb entries alive from user space without modifying them in any other way? >> >> - Felix > > Hi Felix, > That's very nice! Interesting work. One way it's usually done is through periodic NTF_USE (refresh), > another would be to mark them externally learned and delete them yourself (user-space aging). > It really depends on the exact semantics you'd like. I will try NTF_USE, thanks. I really just want to keep the bridge fdb entries alive while there is activity on the offloaded flows. - Felix
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