netdev - Re: [net-next 1/4 (V3)] net: ethtool: add the EEE support

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Date:	Mon, 16 Apr 2012 07:41:23 +0200
From:	Giuseppe CAVALLARO <peppe.cavallaro@...com>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	netdev@...r.kernel.org, rayagond@...avyalabs.com,
	davem@...emloft.net
Subject: Re: [net-next 1/4 (V3)] net: ethtool: add the EEE support

On 4/13/2012 12:26 AM, Ben Hutchings wrote:
> On Fri, 2012-04-06 at 11:29 +0200, Giuseppe CAVALLARO wrote:
>> This patch adds two new functions to detect if Energy-Efficient
>> Ethernet (EEE) is supported and the way to enable/disable it.
>>
>> As Ben said, it is certainly necessary to distinguish:
>>
>> a. PHY is advertising EEE from
>> b. Link partner is advertising EEE
>> or
>> c. EEE will be used (= a && b)
>>
>> The logic behind this code, is that .get_eee will pass
>> to the user-space if the EEE is actually used and available (so point c).
>> The .set_eee should used to force the MAC to disable/enable the EEE (if
>> actually supported by MAC+PHY).
> [...]
> 
> What I meant is that userland should be able to find out (a), and,
> *separately*, either (b) or (c).  That is, there must be at least 2
> separate flags for this.  In fact, I explicitly requested you define
> supported/advertising/lp_advertising bitmasks for EEE link modes just
> like we have for autonegotiation.  But you've made no substantive
> changes in response to my review, aside from dropping the added field in
> ethtool_cmd.

Sorry Ben but I believed that (c) was enough.

> What you're submitting just isn't good enough for a generic interface,
> as the ethtool API is supposed to be.  It's not even a good interface to
> your driver.

yes! I'll rework this and provide new patches asap.

peppe

> Ben.
> 

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