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

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Message-ID: <a0a47297-4765-3ba0-3ea2-013dda40e84a@solarflare.com>
Date:   Fri, 19 May 2017 18:17:42 +0100
From:   Edward Cree <ecree@...arflare.com>
To:     Alexei Starovoitov <ast@...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 19/05/17 15:55, Alexei Starovoitov wrote:
> 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 
Thanks for the links!  I'm digging into implementation now.
One question: is there a way to build the verifier as userland code
 (or at least as a module), or will I have to reboot every time I
 want to test a change?
-Ed