From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Hemminger <shemminger@linux-foundation.org>
Subject: Re: [PATCH] sky2:  receive dma mapping error handling
Date: Wed, 3 Feb 2010 08:56:18 -0800
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Cc: Jarek Poplawski <jarkao2@gmail.com>,
	David Miller <davem@davemloft.net>, akpm@linux-foundation.org,
	flyboy@gmail.com, linux-kernel@vger.kernel.org,
	netdev@vger.kernel.org, Michael Chan <mchan@broadcom.com>,
	Don Fry <pcnet32@verizon.net>,
	Francois Romieu <romieu@fr.zoreil.com>,
	Matt Carlson <mcarlson@broadcom.com>
To: Michael Breuer <mbreuer@majjas.com>
Return-path: <linux-kernel-owner@vger.kernel.org>
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Sender: linux-kernel-owner@vger.kernel.org
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On Wed, 03 Feb 2010 11:47:19 -0500
Michael Breuer <mbreuer@majjas.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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