netdev - [cdc_ncm] kickstart

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Message-ID: <alpine.LNX.2.03.1411252210380.1677@gmail.com>
Date:	Tue, 25 Nov 2014 22:29:42 +0100 (CET)
From:	Enrico Mioso <mrkiko.rs@...il.com>
To:	netdev@...r.kernel.org, linux-usb@...r.kernel.org
cc:	alexxst@...il.com, bjorn@...k.no
Subject: [cdc_ncm] kickstart

Hi Bjorn,
Hi Alex.

So - I tried to read and understand parts of the logic implemented in the 
cdc_ncm driver.
What I understood is:
- the device and the drive exchange "obviously" lots of infos about lengths and
   so on
- lots of sanity checks all over the place

And the basic assumption that we are working inndp 16 mode.
So there is a lot of code to write - but not a lot of logic to change, right?
Or are there differences in 32 bit mode that might need attention? (behavioural 
attention, math changes or anything)

So - first of all the tx and rx fixup functions should be changed, 
reimplementing the needed code to let them work.
I was thinking to proceed this way, but I would like to have some comments 
before moving on.
Note that all these line numbers refer to the cdc_ncm.c file in the current 
kernel git tree as of today (Nov 25 at 22:27).

1 - Have a module parameter that inhibits the current forcing of 16 bit NTBs: 
and check for it more or less at line 469 of cdc_ncm.c in function 
cdc_ncm_init.
2 - Check somehow (how?) for the format we are using in .{rx,tx}_fixup 
functions, and switch to two different distinct functions:
- one to handle 16 bits
- one to handle 32 bits
3 - Disambiguate some function names if needed: for example, cdc_ncm_ndp at 
line 983 of the cdc_ncm.c file.

Please CC me and Alex, since (at least I) am not subscribed to the list. Any 
hint or help would be greatly apreciated. Sorry for the long to / cc lists: 
what's the appropriate list for these things?
Enrico
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