Re: XDP (eXpress Data Path) documentation


Jesper Dangaard Brouer
 

On Tue, 20 Sep 2016 19:47:07 -0700
Alexei Starovoitov <alexei.starovoitov@...> wrote:

On Tue, Sep 20, 2016 at 11:08:44AM +0200, Jesper Dangaard Brouer via iovisor-dev wrote:
Hi all,

As promised, I've started documenting the XDP eXpress Data Path):

[1] https://prototype-kernel.readthedocs.io/en/latest/networking/XDP/index.html

IMHO the documentation have reached a stage where it is useful for the
XDP project, BUT I request collaboration on improving the documentation
from all. (Native English speakers are encouraged to send grammar fixes ;-))

You wouldn't believe it: But this pretty looking documentation actually
follows the new Kernel documentation format. It is actually just
".rst" text files stored in my github repository under kernel/Documentation [2]

[2] https://github.com/netoptimizer/prototype-kernel/tree/master/kernel/Documentation
Thanks so much for doing it. This is great start!
Some minor editing is needed here and there.
To make it into official doc do you mind preparing a patch for Jon's doc tree ?
If you think the doc is too volatile and not suitable for kernel.org,
another alternative is to host it on https://github.com/iovisor
since it's LF collaborative project it won't disappear suddenly.
You can be a maintainer of that repo if you like.
I do see this as kernel documentation that eventually should end-up in
Jon's doc tree. Right now it is too volatile. Once XDP have
"stabilized" some more, I plan to push/submit the *relevant* pieces
into the kernel. E.g. I plan to have a "proposals" section, which is
not meant upstream doc as it is an intermediate specification step
before implementing, after which it should move to another doc section.
Likewise some of the use-case documents might be "rejected" before
reaching upstream doc.

The reason I've not created a separate repository for XDP doc only, is
because I also plan to document other parts of the kernel in this
repo[3], not just XDP. Like my page_pool work. The documentation is
not really official documentation before it reach a kernel git tree,
together with the code it documents.

I hope this approach can help us document while developing, and
turn email discussions into specifications. Like I forgot the
XDP_ABORTED not warning argument, which you had to re-iterate, but now
it is documented[4][5].

--
Best regards,
Jesper Dangaard Brouer
MSc.CS, Principal Kernel Engineer at Red Hat
Author of http://www.iptv-analyzer.org
LinkedIn: http://www.linkedin.com/in/brouer

[3] https://github.com/netoptimizer/prototype-kernel/
[4] https://github.com/netoptimizer/prototype-kernel/commit/a4e60e2d7a894
[5] https://prototype-kernel.readthedocs.io/en/latest/networking/XDP/implementation/userspace_api.html#troubleshooting-and-monitoring

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