From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Justin P. Mattock" Subject: Re: [PATCH] sky2: receive dma mapping error handling Date: Wed, 03 Feb 2010 09:16:43 -0800 Message-ID: <4B69AF7B.70402@gmail.com> References: <20100128223447.GC3109@del.dom.local> <4B621316.8070308@majjas.com> <20100128225621.GD3109@del.dom.local> <4B6216B9.1010802@majjas.com> <20100128153643.0fca3c51@nehalam> <4B645EF4.4050701@majjas.com> <20100131003449.GA11935@del.dom.local> <4B650D53.2010607@majjas.com> <4B65D0F9.2020602@majjas.com> <4B65FD12.7090101@majjas.com> <20100131221835.GA3317@del.dom.local> <20100201102018.7b597992@nehalam> <4B68F664.6050007@majjas.com> <4B69A897.7030408@majjas.com> <20100203085618.6662cc6f@nehalam> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Michael Breuer , Jarek Poplawski , David Miller , akpm@linux-foundation.org, flyboy@gmail.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, Michael Chan , Don Fry , Francois Romieu , Matt Carlson To: Stephen Hemminger Return-path: In-Reply-To: <20100203085618.6662cc6f@nehalam> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org On 02/03/10 08:56, Stephen Hemminger wrote: > On Wed, 03 Feb 2010 11:47:19 -0500 > Michael Breuer 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. > I noticed this in a hotel last week, I can try at the home to see if this fires of, if so I can test any patches you have. Justin P. Mattock