netdev - Re: [PATCH 2/4 v2] netdev: bfin_mac: fix malformed UDP packet transmission when polling with KGDB

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Message-Id: <20090529.154948.232160792.davem@davemloft.net>
Date:	Fri, 29 May 2009 15:49:48 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	vapier@...too.org
Cc:	netdev@...r.kernel.org, uclinux-dist-devel@...ckfin.uclinux.org,
	sonic.zhang@...log.com, cooloney@...nel.org
Subject: Re: [PATCH 2/4 v2] netdev: bfin_mac: fix malformed UDP packet
 transmission when polling with KGDB

From: Mike Frysinger <vapier@...too.org>
Date: Fri, 29 May 2009 09:40:43 -0400

> From: Sonic Zhang <sonic.zhang@...log.com>
> 
> Writes to the DMA descriptors may sit in the internal Blackfin data buffers
> and not actually be available when the DMA engine goes to fetch them.  This
> does not typically happen, but when dealing with short/fast packets such as
> UDP and polling KGDB, this occurs much more frequently.  Same goes for
> heavy loads as seen by netperf tests or large scp transfers.  So force the
> buffers to drain with SSYNC otherwise we get random malformed packets.
> 
> Signed-off-by: Sonic Zhang <sonic.zhang@...log.com>
> Signed-off-by: Mike Frysinger <vapier@...too.org>
> Signed-off-by: Bryan Wu <cooloney@...nel.org>

Applied to net-next-2.6
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