netdev - Re: ethtool physical identify vs netlink locking?

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Date:	Tue, 29 Mar 2011 17:13:28 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	bhutchings@...arflare.com
Cc:	shemminger@...tta.com, netdev@...r.kernel.org
Subject: Re: ethtool physical identify vs netlink locking?

From: Ben Hutchings <bhutchings@...arflare.com>
Date: Wed, 30 Mar 2011 01:07:56 +0100

> In the sfc driver, physical ID used to be delegated to the PHY
> operations.  Then I realised that it was pointless to use a PHY's blink
> mode where it was available and a periodic timer on the host where it
> wasn't, when the latter would work for all of them.  So I would propose:
> 
> 4. Define a ethtool operation 'set_id_state' with an argument that sets
> identification on/off/inactive/active (the last optional, for any driver
> that really wants to do this differently).  When this is defined, the
> ethtool core runs the loop and acquires the lock each time it calls this
> operation.
> 
> This requires changes to every driver, though not all at once.  As an
> additional benefit, it should result in consistent behaviour for the
> count = 0 case.

This seems like a good way to solve the problem.
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