> On Aug 21, 2018, at 11:17 PM, Toke Høiland-Jørgensen <t...@toke.dk> wrote: >> >> Well that’s good timing for me as I’m wrapping up a small utility/eBPF >> to classify an arbitrary username to either MAC or IP. Here’s the work >> in progress, which is not done yet as flow fairness is still under >> construction, and I haven’t gotten my IPv6 support to pass the rather >> stubborn eBPF verifier: https://github.com/heistp/tc-users >> <https://github.com/heistp/tc-users <https://github.com/heistp/tc-users>> > > Did you see my classifier? Does subnet-to-flow mapping. > https://github.com/tohojo/tc-classifier > <https://github.com/tohojo/tc-classifier>
Yes I did, that helped a lot with the eBPF code! I’ll consult it for LPM trie usage, which will have to be ifdef’d out though for pre-4.11 kernels. tc-users is similar really but I desired a few things (for FreeNet): - MAC and IPv6 support - to map arbitrary usernames to the least used class id - to minimize the number of map changes when there are a lot of users to sync (not done yet) - flow fairness (though given your new info below, I think that just got way easier) - to write the userspace utility in C, for practice >> - With the new major/minor ID distinction, I’d probably use major for >> the user and minor for the flow hash? > > Yes. See the latest commit in the tc-adv repo for a man page update > explaining it. You can also just set the major ID and let cake do the flow > hashing… Aha, that’s terribly convenient but also means I don’t really need to solve the hashing problem (rats), and will be ripping out some of what I started. :) >> Another thing I haven’t looked into yet is that when fq_codel is the >> qdisc, the eBPF action is only called "once in a while” (start of a new >> flow?) With cake it’s called for every single packet, which is what I >> expected to happen, but very different behavior. > > Maybe because fq_codel is not splitting gso packets? Good one, I wonder, because I see it’s not just “new flow”, I seem to see it called again on the same flow if there’s a pause in packets on it for “some time”.
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