netdev - Re: [PATCH net-next 1/8] cxgb4: Add support to recognize 40G links

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Date:	Thu, 20 Feb 2014 11:16:26 -0800
From:	Casey Leedom <leedom@...lsio.com>
To:	Florian Fainelli <f.fainelli@...il.com>
CC:	Steve Wise <swise@...ngridcomputing.com>,
	Hariprasad Shenai <hariprasad@...lsio.com>,
	netdev <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>, dm@...lsio.com,
	nirranjan@...lsio.com, kumaras@...lsio.com, santosh@...lsio.com
Subject: Re: [PATCH net-next 1/8] cxgb4: Add support to recognize 40G links


On 02/20/14 11:00, Florian Fainelli wrote:
> 2014-02-20 10:07 GMT-08:00 Casey Leedom <leedom@...lsio.com>:
>> On 02/19/14 13:12, Steve Wise wrote:
>>>
>>> You probably should add SPEED_40000 to include/uapi/linux/ethtool.h as
>>> part of this series.
>>
>>    I'm ~pretty sure~ that the "word on the street" was that the community
>> wanted to get away from the SPEED_XXX symbols since they simply represented
>> the values XXX.  Thus they didn't offer any real symbolic isolation from
>> weird constants, etc.  I believe that the old SPEED_XXX values were left in
>> place in order to avoid making tons of changes everywhere ...
> Not quite sure where and when you heard that, it seems a little
> disturbing to add a comment in this patch saying "this I how I should
> fix things" and not do them, especially when this is a one-liner.
> Having a well defined constant is easier to grep than having the
> open-coded 40000 constant which will lead to false positives
> throughout the tree.

   Like I said, it was a vague memory at best from over a year ago. I 
seem to remember someone on our team trying to push SPEED_40000 into the 
kernel and getting rebuffed.  Perhaps I didn't have enough coffee that day.

   In any case, I personally like the idea of SPEED_40000 for exactly 
the reason you offer: I can search for it meaningfully.  So If my vague 
memory is wrong, yeay!

Casey

> --
> Florian


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