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example adding static table entries? #1968

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maxholli opened this issue Jun 13, 2019 · 3 comments
Open

example adding static table entries? #1968

maxholli opened this issue Jun 13, 2019 · 3 comments
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ebpf Topics related to the eBPF back end question This is a topic requesting clarification.

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@maxholli
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Hi, I'm using p4c-ebpf and I'd like to add static table entries. Are there any example .json or .txt files that I can model the formatting off of when using --p4runtime-entries-files. Thanks for the help
@mihaibudiu
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The ebpf code cannot be used with p4runtime.

It should not be difficult to add support for static table entries if it is not there yet.

@mihaibudiu mihaibudiu added the enhancement This topic discusses an improvement to existing compiler code. label Jun 13, 2019
@mihaibudiu
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Let's keep this open, and hopefully I can do the work to support static table entries next week.

@jafingerhut jafingerhut added the ebpf Topics related to the eBPF back end label Jun 20, 2019
@mihaibudiu
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In fact, the ebpf back-end should already emit table intializers.
The ebpf back-end does not use p4runtime; the control-plane is implemented by writing directly to ebpf maps. The back-end generates a header file that contains the initial values of tables; this function is called init_tables(), and it should be called first (ideally before any packets are processed).

@mihaibudiu mihaibudiu added question This is a topic requesting clarification. and removed enhancement This topic discusses an improvement to existing compiler code. labels Jun 20, 2019
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@jafingerhut @maxholli @mihaibudiu