netdev - Re: [PATCH] sky2: receive dma mapping error handling

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Message-ID: <20100203085618.6662cc6f@nehalam>
Date:	Wed, 3 Feb 2010 08:56:18 -0800
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	Michael Breuer <mbreuer@...jas.com>
Cc:	Jarek Poplawski <jarkao2@...il.com>,
	David Miller <davem@...emloft.net>, akpm@...ux-foundation.org,
	flyboy@...il.com, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, Michael Chan <mchan@...adcom.com>,
	Don Fry <pcnet32@...izon.net>,
	Francois Romieu <romieu@...zoreil.com>,
	Matt Carlson <mcarlson@...adcom.com>
Subject: Re: [PATCH] sky2:  receive dma mapping error handling

On Wed, 03 Feb 2010 11:47:19 -0500
Michael Breuer <mbreuer@...jas.com> wrote:

> Tracked this down. The status being returned is 0x3c0080 - good flow 
> control packets. Nothing is actually being dropped (confirmed by packet 
> trace on switch compared with packet trace on server).
> 
> I whipped up a trivial patch to not count these as dropped packets and 
> will post to netdev.
> 
> I'm not really sure what the driver should be doing in this case, but 
> resubmit seems to work.

Looks like a flow control negotiation issue. You probably turned off
flow control on the Linux side, but the switch is still doing flow
control.

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