Date: Wed, 29 Mar 2017 02:00:08 +0200 From: Daniel Borkmann <daniel@...earbox.net> To: Shubham Bansal <illusionist.neo@...il.com> CC: David Miller <davem@...emloft.net>, Kees Cook <keescook@...omium.org>, Mircea Gherzan <mgherzan@...il.com>, Network Development <netdev@...r.kernel.org>, kernel-hardening@...ts.openwall.com, linux-arm-kernel@...ts.infradead.org, ast@...com Subject: Re: arch: arm: bpf: Converting cBPF to eBPF for arm 32 bit Hi Shubham, On 03/28/2017 10:49 PM, Shubham Bansal wrote: [...] > Do you have any document to understand the working of tail calls? I > looked at your presentations but it seemed confusing to me. Anything > simple would be great, just about the tail calls. I don't think I need > examples, I can get them from your presentations. I just need a very > general idea. May be you know the code in kernel where it is > implemented. Sure, it's in __bpf_prog_run(), see the JMP_TAIL_CALL (kernel/bpf/core.c +1019). That's effectively what JITs implement.  page 3 has a high-level description as well, hope that helps. Thanks, Daniel  http://www.netdevconf.org/1.1/proceedings/papers/On-getting-tc-classifier-fully-programmable-with-cls-bpf.pdf
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