netdev - Re: [PATCH bpf 5/5] flow_dissector: document BPF flow dissector environment

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Date:   Wed, 3 Apr 2019 11:50:10 -0700
From:   Stanislav Fomichev <sdf@...ichev.me>
To:     Jesper Dangaard Brouer <brouer@...hat.com>
Cc:     Stanislav Fomichev <sdf@...gle.com>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, davem@...emloft.net, ast@...nel.org,
        daniel@...earbox.net, simon.horman@...ronome.com,
        willemb@...gle.com, peterpenkov96@...il.com
Subject: Re: [PATCH bpf 5/5] flow_dissector: document BPF flow dissector
 environment

On 04/03, Jesper Dangaard Brouer wrote:
> On Mon,  1 Apr 2019 13:57:34 -0700
> Stanislav Fomichev <sdf@...gle.com> wrote:
> 
> > diff --git a/Documentation/networking/bpf_flow_dissector.txt b/Documentation/networking/bpf_flow_dissector.txt
> > new file mode 100644
> > index 000000000000..513be8e20afb
> > --- /dev/null
> > +++ b/Documentation/networking/bpf_flow_dissector.txt
> 
> It looks like you use the RST format, but you use suffix .txt and not .rst.
Thanks for the suggestion, let me try to rename it to .rst and build local
htmldocs to make sure it renders correctly (I'm not sure about the ascii art).
If that looks good, I'll follow up with a rename patch.

> 
> If you don't know, these files get rendered on:
>  https://www.kernel.org/doc/html/latest/bpf/index.html
> 
> And GitHub also render this stuff e.g.
>  https://github.com/torvalds/linux/blob/master/Documentation/bpf/bpf_devel_QA.rst
>  
> 
> > @@ -0,0 +1,115 @@
> > +==================
> > +BPF Flow Dissector
> > +==================
> > +
> > +Overview
> > +========
> > +
> > +Flow dissector is a routine that parses metadata out of the packets. It's
> > +used in the various places in the networking subsystem (RFS, flow hash, etc).
> > +
> > +BPF flow dissector is an attempt to reimplement C-based flow dissector logic
> > +in BPF to gain all the benefits of BPF verifier (namely, limits on the
> > +number of instructions and tail calls).
> > +
> > +API
> > +===
> > +
> 
> 
> -- 
> Best regards,
>   Jesper Dangaard Brouer
>   MSc.CS, Principal Kernel Engineer at Red Hat
>   LinkedIn: http://www.linkedin.com/in/brouer