Please see in line below against “<hs>”.
From: Jon Loeliger <j...@netgate.com> Sent: Tuesday, September 29, 2020 12:36 PM To: hem...@mnkcg.com Cc: vpp-dev <vpp-dev@lists.fd.io> Subject: Re: [vpp-dev] table lookup api? On Tue, Sep 29, 2020 at 9:31 AM <hem...@mnkcg.com <mailto:hem...@mnkcg.com> > wrote: Maybe we need to clarify some terms here. What does "lookup" mean to you? <hs> Table lookup. What is the lookup key, <hs> The key is any data struct, for example, a 6-tuple. See the key starting at this line: https://github.com/hesingh/misc/blob/master/p4-vpp/foo.h#L1 and what is the result of the lookup? The format of the result example is this data struct: https://github.com/hesingh/misc/blob/master/p4-vpp/foo.h#L14 The result says, “run one of drop4, permit4, or add_eth4 actions. The drop4 action has no args, while the args to the permit4, or add_eth4 actions are the data structs with the same name. Are you are talking about matching a packet (mask and value match)? <hs>It’s a compiler which accepts any table key format as a struct and any result format as a struct and enum of actions. A key with (value, mask) is supported. If so, a Classifier session is used for that purpose. Within the session entry, actions are specified. You can have a node-handoff to an existing graph node, or opaque handoff, or handoff to your own node for processing. <hs> I poked around vpp/src/plugin/ and see .n_next_nodes support a user-defined action. I don’t have to change VPP. Thanks, Hemant
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