netdev - Re: [PATCH net-next] sfc: Use the correct maximum TX DMA ring size for SFC9100

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Message-Id: <20140123.134145.959979759670800287.davem@davemloft.net>
Date:	Thu, 23 Jan 2014 13:41:45 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	sshah@...arflare.com
Cc:	netdev@...r.kernel.org, linux-net-drivers@...arflare.com
Subject: Re: [PATCH net-next] sfc: Use the correct maximum TX DMA ring size
 for SFC9100

From: Shradha Shah <sshah@...arflare.com>
Date: Thu, 23 Jan 2014 14:35:48 +0000

> From: Ben Hutchings <bhutchings@...arflare.com>
> 
> As part of a workaround for a hardware erratum in the SFC9100 family
> (SF bug 35388), the TX_DESC_UPD_DWORD register address is also used
> for communicating with the event block, and only descriptor pointer
> values < 2048 are valid.
> 
> If the TX DMA ring size is increased to 4096 descriptors (which the
> firmware still allows) then we may write a descriptor pointer 
> value >= 2048, which has entirely different and undesirable effects!
> 
> Limit the TX DMA ring size correctly when this workaround is in
> effect.
> 
> Fixes: 8127d661e77f ('sfc: Add support for Solarflare SFC9100 family')
> Signed-off-by: Ben Hutchings <bhutchings@...arflare.com>
> Signed-off-by: Shradha Shah <sshah@...arflare.com>

Applied.
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