netdev - Re: [PATCH net-next 0/2] Add support for PHY packet generators

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Message-Id: <20160218.154539.340432973192973342.davem@davemloft.net>
Date:	Thu, 18 Feb 2016 15:45:39 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	andrew@...n.ch
Cc:	f.fainelli@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH net-next 0/2] Add support for PHY packet generators

From: Andrew Lunn <andrew@...n.ch>
Date: Wed, 17 Feb 2016 21:32:05 +0100

> Some Ethernet PHYs contain a simple packet generator. This can be
> useful for bringing up new devices, trying to determine if a problem
> lies in the MAC-PHY connection or PHY-Socket. Also, the PHY generators
> can generate invalid packets, which is hard to do in software.
> 
> Add support ethtool(1) and wire up the Marvell PHY packet generator.

You really cannot make this blocking, every time we've added a blocking
ethtool op that could take a non-trivial amount of time we've been
burnt.

So as Ben mentioned blocking for 0.3 seconds or whatever is a non-starter.