netdev - Re: Linux support for 802.3af?

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Message-ID: <4B9AE62B.6050502@redfish-solutions.com>
Date:	Fri, 12 Mar 2010 18:11:07 -0700
From:	"Philip A. Prindeville" <philipp_subx@...fish-solutions.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
CC:	netdev@...r.kernel.org
Subject: Re: Linux support for 802.3af?

On 03/12/2010 05:43 PM, Ben Hutchings wrote:
> On Fri, 2010-03-12 at 17:01 -0700, Philip A. Prindeville wrote:
>> I was looking at this Marvell-based 4-port PCI card with PoE and
>> thinking it would be handy for powering cameras and ip-phones, but don't
>> remember seeing any kernel support for 802.3af...
>>
>> http://www.korenix.com/jetcard-PoE_Universal_PCI_Card-2215-overview.htm
>>
>> There's no support for 802.3af, right?
> 
> The standard MDIO ioctls can be used to access registers 11 and 12 on
> PHYs with integrated PSE functionality.  There is no way of indicating
> whether a PHY has such functionality, but a flag for this could be added
> to the mdio_support field of struct ethtool_cmd.
> 
> Ben.

Well, there's more to it than that, right?

There's a software state machine that's required to go through the handshake, there's prioritization and power budgeting, etc.  Yes?

What am I missing?

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