netdev - Re: [PATCH 1/1 net-next] net: fec: enable pause frame to improve rx prefomance for 1G network

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Message-ID: <1357653447.29986.15.camel@deadeye.wl.decadent.org.uk>
Date:	Tue, 8 Jan 2013 13:57:27 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	David Laight <David.Laight@...LAB.COM>
CC:	Frank Li <Frank.Li@...escale.com>, <lznuaa@...il.com>,
	<shawn.guo@...aro.org>, <B38611@...escale.com>,
	<davem@...emloft.net>, <linux-arm-kernel@...ts.infradead.org>,
	<netdev@...r.kernel.org>, <s.hauer@...gutronix.de>
Subject: Re: [PATCH 1/1 net-next] net: fec: enable pause frame to improve rx
 prefomance for 1G network

On Tue, 2013-01-08 at 13:32 +0000, David Laight wrote:
> > If the medium supports autoneog, use mii_advertise_flowctrl() in
> > set_pauseparam to update pause frame advertising and then restart
> > autoneg.
> 
> Isn't autoneg continuous?
> In which case you just need to monitor the response register.
> Monitoring MII registers is usually a complete PITA though
> (due to the requirements for delays during the bit-bashing).

AIUI you have to break the link before renegotiating.  So you should
only need to read autoneg results after a PHY interrupt or polling for a
link change.

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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