Re: [cdc_ncm] guidance and help refactoring cdc_ncm

On Sun, May 31, 2015 at 04:37:11PM +0200, Enrico Mioso wrote:

Hello guys.
I am writing to you all to ask for help and assistance in refactoring the
cdc_ncm driver to support newer devices.
In particular - I would need step-by-step guidance in doing this: or any
other kind of help would be anyway greatly apreciated.

1 - What we need:
  We would need to refactor the driver to be able to re-order parts of the NCM
  package itself.
  In particular, being a single NCM frame composed of different parts, we would
  need more flexibility in changing their order.

Do you have hardware that needs this now?  What exactly needs to be done
here that currently doesn't work?

2 - What might be nice
  To do so, it would be nice to have the driver queue up frames, sending them
  out as needed. this already happens to a certain extent, but the NCM package
  is created in the process and updated in the while as I understood the code.
  The best thing would be to have the NCM package created only before sending
  it out, to achieve for best performance and code readability.

Would this really make things faster?

I already contactedprivately some of you to have some more insight on what
needs to be done, and to understand better how to organize the effort. I
unfortunately miss the time to do this right now: and infact I can't even be
sure to be able to do this, due to various problems (my tesis, my life in
general).
But gathering more informations and in general trying to get some help is
the best thing I feel like doing right now.

The compelling reasons I find for trying to fix the situation are:
1 - The fact these drivers are used in different products integrating or
  interfacing with 3G/4G technologies.

Is there hardware that has out-of-tree drivers that implement what you
are referring to here?  Or does someone just want this to make the
hardware work "better"?

I think we need more specifics before being able to determine exactly
what needs to be done.

thanks,

greg k-h
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