Subject: Re: [PATCH] sky2: receive dma mapping error handling

From: Michael Breuer <[email-masked]>
Date: Wed, 03 Feb 2010 12:07:40 -0500

On 02/03/2010 11:56 AM, Stephen Hemminger wrote:
> On Wed, 03 Feb 2010 11:47:19 -0500
> Michael Breuer<[email-masked]>  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.
>
>    
According to the driver:
Feb  3 12:03:02 mail kernel: sky2 eth0: Link is up at 1000 Mbps, full 
duplex, flow control both

So if the rx flow control packet status is due to flow control being 
disabled, then there's a different issue.