netdev - Re: [PATCH v2 1/3] bpf: Use 1<<16 as ceiling for immediate alignment in verifier.

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Message-ID: <db8cd2e8-9f51-dc8b-5e55-4c75d13d4858@fb.com>
Date:   Fri, 19 May 2017 07:55:16 -0700
From:   Alexei Starovoitov <ast@...com>
To:     Edward Cree <ecree@...arflare.com>,
        David Miller <davem@...emloft.net>,
        Daniel Borkmann <daniel@...earbox.net>
CC:     <alexei.starovoitov@...il.com>, <netdev@...r.kernel.org>
Subject: Re: [PATCH v2 1/3] bpf: Use 1<<16 as ceiling for immediate alignment
 in verifier.

On 5/19/17 7:21 AM, Edward Cree wrote:
> I'm currently translating the algos to C.  But for the kernel patch,
>  I'll need to read & understand the existing verifier code, so it
>  might take a while :)  (I don't suppose there's any design document
>  or hacking-notes you could point me at?)

Dave just gave a good overview of the verifier:
https://www.spinics.net/lists/xdp-newbies/msg00185.html

Few more details in
Documentation/networking/filter.txt
and in top comments in kernel/bpf/verifier.c

General bpf arch overview:
http://docs.cilium.io/en/latest/bpf/#instruction-set

> But I'll give it a go for sure.

Thanks!