linux-kernel - Re: TG3 data corruption (TSO ?)

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Date:	Sun, 10 Sep 2006 22:18:52 -0700
From:	"Michael Chan" <mchan@...adcom.com>
To:	"Benjamin Herrenschmidt" <benh@...nel.crashing.org>
cc:	"Segher Boessenkool" <segher@...nel.crashing.org>,
	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	"Linux Kernel list" <linux-kernel@...r.kernel.org>
Subject: Re: TG3 data corruption (TSO ?)

Benjamin Herrenschmidt wrote:

> I've added a wmb() in tw32_rx_mbox() and tw32_tx_mbox() and can still
> reproduce the problem. I've also done a 2 days run without TSO enabled
> without a failure (my test program normally fails after a couple of
> minutes).
> 

Hi Ben,

The code is a bit tricky.  It uses function pointers for the various
register read/write methods.  For the 5780, I believe it will be
assigned a simple writel() and not tg3_write32_tx_mbox().  Can you
double check to make sure you have actually added the wmb()?

It's probably easiest to just add the wmb() in tg3_xmit_dma_bug()
before the tw32_tx_mbox().

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