netdev - Re: [PATCHv3 net-next 00/31] Misc. fixes for cxgb4 and iw

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Message-Id: <DB7B3A5C-9674-44C2-8AA4-2C468F09DFF5@chelsio.com>
Date:	Wed, 5 Mar 2014 11:59:35 -0800
From:	Casey Leedom <leedom@...lsio.com>
To:	Or Gerlitz <or.gerlitz@...il.com>
Cc:	Hariprasad S <hariprasad@...lsio.com>,
	David Miller <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	linux-rdma <linux-rdma@...r.kernel.org>,
	Roland Dreier <roland@...estorage.com>, kumaras@...lsio.com,
	dm@...lsio.com, Steve Wise <swise@...ngridcomputing.com>,
	santosh@...lsio.com, nirranjan@...lsio.com,
	Eli Cohen <eli@...lanox.com>
Subject: Re: [PATCHv3 net-next 00/31] Misc. fixes for cxgb4 and iw_cxgb4


On Mar 5, 2014, at 11:52 AM, Or Gerlitz <or.gerlitz@...il.com> wrote:

> On Wed, Mar 5, 2014 at 9:46 PM, Casey Leedom <leedom@...lsio.com> wrote:
>> On Mar 5, 2014, at 11:39 AM, Or Gerlitz <or.gerlitz@...il.com> wrote:
>>> On Wed, Mar 5, 2014 at 9:15 PM, Casey Leedom <leedom@...lsio.com> wrote:
>>>> Yes, thanks mightily for your help and advice and sorry for the size of the updates.  Hari has taken on the very difficult task of synchronizing our out-of-kernel development branch with the in-kernel code.  These two code bases have drifted apart quite a bit because of the difficulty of translating our out-of-kernel changes into the in-kernel driver which uses completely different symbolic register constants.
>>> 
>>> Can you explain this in a little bit more details? what's the source
>>> of the need to use two different sets of symbolic register constants?
>> 
>>  When our cxgb4 driver was first submitted for inclusion in kernel.org someone objected to the format of our symbolic register constants and forced us to change them.
> 
> are you referring to constants defined in
> drivers/net/ethernet/chelsio/cxgb4/t4_hw.h or other/more headers?

  t4_regs.h.  Strangely, when we submitted the driver, the very similar symbolic constant formats in t4_msg.h and t4fw_api.h weren’t targeted; just the ones in t4_regs.h.

Casey

> Unfortunately these constants are generated directly from our hardware
> design and we can't change them internally -- it would significantly
> increase development/debugging time with our hardware team if we had
> to constantly help the hardware team member translate back and forth
> between the confusingly similar but different names.  Additionally,
> though I know that this isn't a concern of kernel.org, every other OS
> driver for our adapters use the hardware-derived symbolic register
> constants and our software team internally often work on several
> different OS Drivers as we work out better ways to do various things.
> All of this means that our in-house/out-of-kernel driver uses the
> hardware-derived symbolic constants and every time we need to push a
> change into kernel.org we need to go through a very careful
> translation of the symbolic register constants.

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