Message-ID: <4F74265F.8060508@openwrt.org>
Date:	Thu, 29 Mar 2012 11:07:43 +0200
From:	Florian Fainelli <florian@...nwrt.org>
To:	Jim Cromie <jim.cromie@...il.com>
CC:	Bo Han <bohan@...umd.edu>, netdev@...r.kernel.org,
	linux-wireless <linux-wireless@...r.kernel.org>
Subject: Re: maranello for linux-current [b43 driver]

(Adding linux-wireless in CC)

Le 03/29/12 00:24, Jim Cromie a écrit :
> you may have heard of maranello, a project to add
> partial packet recovery to 80211, by adding block checksums
> on transmit, validating them or re-requesting retransmit
> of corrupted blocks.
>
> http://www.cs.umd.edu/projects/maranello/
>
> the code at the page is for 2.6.29-rc2
>
> Ive taken it, did some refactoring to ease merging,
> and merged in each linux release, up to 3.3
>
> The refactoring is:
>
> - move code from include/net/mac80211.h utils.c to
> drivers/net/wireless/maranello.*
> this makes it somewhat common, but more isolated overall,
> and reduces merge conflicts due to continued evolution of those files.
> I imagine new code would eventually go back to the original files, but
> not for a while.
>
> - move most of new code in each *.c file to *_mnlo.c
> fn decls added to corresponding *.h
> again, this code probably would be moved back to original *.c, but not yet.
>
>
> After all the merges, I compiled, and found some errors.
> I had problems building plain 2.6.29-rc2, and several later releases,
> so punted on compiling every step.
>
> The compile errors are fixed on top of the merges, but ideally should be
> rearranged to fix each release.  This requires more git-fu than I possess,
> and IIUC, netdev ML is more interested in patches to linux-current.
>
> Repeating:  this is only compile tested, I dont have a b43 based wifi card
> in my desk/lap-tops.
>
> I do have a WRT54G router, currently running openWRT 10.03
> which does have a b43 wifi chip.  I intend to try putting this code
> there eventually,
> but that may take a while yet, and cannot test maranello itself anyway.
>
> Having split maranello code into new files, I have some misgivings about
> that approach - it simplified merges, but at the cost of not seeing
> the underlying conflicts.  The compiler told me about some, surely others lurk.
>
> So I guess Im seeking advice:
>
> - what did I break
> - what happens when the driver is tested
> - whether to repeat this merge-effort w/o the split
>
> - why did earlier releases fail to build
>    [jimc@...ucho linux-2.6]$ git checkout v2.6.29
>    [jimc@...ucho build-dell-2]$ make xconfig
>    Makefile:23: *** mixed implicit and normal rules.  Stop.
>    I also see breakage on unrelated stuff (that builds fine on mainline)
>    [jimc@...ucho build-dell-2]$ make
>    AS      arch/x86/xen/xen-asm_64.o
>    /home/jimc/projects/lx/linux-2.6/arch/x86/xen/xen-asm_64.S:
> Assembler messages:
>    /home/jimc/projects/lx/linux-2.6/arch/x86/xen/xen-asm_64.S:48:
> Error: unsupported for `mov'
>    ...
> the tree is here:
> https://github.com/jimc/linux-2.6/tree/maranello/released-split
>
> Im happy to open it up for collaboration if theres interest,
> I'll have to figure out how to do that though..
> Of course you can clone and fork it.
>
> Its probably premature to concentrate on rework for inclusion,
> I think itd be better to get it working on mainline 1st,
> but the long view might inform the short-term steps.
>
> thanks
> Jim Cromie
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