netdev - Re: [net-2.6 PATCH] ixgbe: DCB, fix TX hang occurring in stress condition with PFC

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Message-Id: <20101028.102034.183041365.davem@davemloft.net>
Date:	Thu, 28 Oct 2010 10:20:34 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jeffrey.t.kirsher@...el.com
Cc:	netdev@...r.kernel.org, gospo@...hat.com, bphilips@...ell.com,
	john.r.fastabend@...el.com
Subject: Re: [net-2.6 PATCH] ixgbe: DCB, fix TX hang occurring in stress
 condition with PFC

From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Date: Thu, 28 Oct 2010 03:59:57 -0700

> From: John Fastabend <john.r.fastabend@...el.com>
> 
> The DCB credits refill quantum _must_ be greater than half the max
> packet size. This is needed to guarantee that TX DMA operations
> are not attempted during a pause state. Additionally, the min IFG
> must be set correctly for DCB mode. If a DMA operation is
> requested unexpectedly during the pause state the HW data
> store may be corrupted leading to a DMA hang.  The DMA hang
> requires a reset to correct. This fixes the HW configuration
> to avoid this condition.
> 
> Signed-off-by: John Fastabend <john.r.fastabend@...el.com>
> Tested-by: Ross Brattain <ross.b.brattain@...el.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>

Applied.
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