Messages in this thread | | | Subject | Re: [RFC PATCH net-next V2 0/6] XDP rx handler | From | Jason Wang <> | Date | Thu, 16 Aug 2018 12:24:07 +0800 |
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On 2018年08月16日 12:05, Alexei Starovoitov wrote: > On Thu, Aug 16, 2018 at 11:34:20AM +0800, Jason Wang wrote: >>> Nothing about the topology is hard coded. The idea is to mimic a >>> hardware pipeline and acknowledging that a port device can have an >>> arbitrary layers stacked on it - multiple vlan devices, bonds, macvlans, etc >> I may miss something but BPF forbids loop. Without a loop how can we make >> sure all stacked devices is enumerated correctly without knowing the >> topology in advance? > not following. why do you need a loop to implement macvlan as an xdp prog? > if loop is needed, such algorithm is not going to scale whether > it's implemented as bpf program or as in-kernel c code.
David said the port can have arbitrary layers stacked on it. So if we try to enumerate them before making forwarding decisions purely by BPF program, it looks to me a loop is needed here.
Thanks
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