netdev - Re: [PATCH RFC] sparc64: eBPF JIT

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Date:   Fri, 21 Apr 2017 18:50:34 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     David Miller <davem@...emloft.net>
CC:     sparclinux@...r.kernel.org, netdev@...r.kernel.org, ast@...nel.org
Subject: Re: [PATCH RFC] sparc64: eBPF JIT

On 04/21/2017 06:46 PM, David Miller wrote:
> From: Daniel Borkmann <daniel@...earbox.net>
> Date: Mon, 17 Apr 2017 20:44:35 +0200
>
>> There is samples/bpf/sockex3_kern.c, which exercises it. To
>> run it, it would be (clang/llvm needed due to BPF backend not
>> available in gcc):
>>
>> # cd samples/bpf
>> # make
>> # ./sockex3
>> IP     src.port -> dst.port               bytes      packets
>> 127.0.0.1.12865 -> 127.0.0.1.49711          148            2
>> 127.0.0.1.49711 -> 127.0.0.1.12865          108            2
>> [...]
>>
>> Inside parse_eth_proto(), it will do tail calls based on the
>> eth protocol. Over time, we'll move such C based tests over to
>> tools/testing/selftests/bpf/.
>
> Ok, after a lot of work setting up an LLVM/CLANG environment and other
> things, I implemented tail call support and got this working.
>
> Thanks for the pointers.

Awesome, thanks!