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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH RFC] sparc64: eBPF JIT
Date: Fri, 21 Apr 2017 12:46:40 -0400 (EDT)
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From: Daniel Borkmann <daniel@iogearbox.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.