netdev - Re: [PATCH v3 net-next 1/2] tools: psock_lib: tighten conditions checked in sock

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Message-ID: <20170104222224.GA31756@oracle.com>
Date:   Wed, 4 Jan 2017 17:22:24 -0500
From:   Sowmini Varadhan <sowmini.varadhan@...cle.com>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     linux-kselftest@...r.kernel.org, netdev@...r.kernel.org,
        willemb@...gle.com, davem@...emloft.net, shuah@...nel.org
Subject: Re: [PATCH v3 net-next 1/2] tools: psock_lib: tighten conditions
 checked in sock_setfilter

On (01/04/17 23:16), Daniel Borkmann wrote:
> 
> Just reading up on the thread, sorry to jump in late. Can't you just
> use the generated code from bpf_asm (tools/net/) and add the asm program
> as a comment above? Something like we do in net/core/ptp_classifier.c +13.

I was actually using the example from the BSD bpf(4) man page, 
and expanding on that one.. 
  https://www.freebsd.org/cgi/man.cgi?query=bpf&sektion=4&manpath=FreeBSD+4.7-RELEASE
(I could not find the equivalent linux man page).

It was a lot easier to parse than the existing code .

> As it stands it makes it a bit harder to parse / less readable with macros
> actually. Rest seems fine, thanks.

You think the earlier code was readable? I had to use
gcc -E, with help from the bpf(4) page, to make sense of it.

--Sowmini