netdev - Re: [PATCH] r8169: RxConfig hack for the 8168evl.

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Date:	Fri, 22 Jun 2012 21:49:02 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	romieu@...zoreil.com
Cc:	hayeswang@...ltek.com, netdev@...r.kernel.org, thomas.pi@...or.de
Subject: Re: [PATCH] r8169: RxConfig hack for the 8168evl.

From: Francois Romieu <romieu@...zoreil.com>
Date: Thu, 21 Jun 2012 00:09:18 +0200

> The 8168evl (RTL_GIGA_MAC_VER_34) based Gigabyte GA-990FXA motherboards
> are very prone to NETDEV watchdog problems without this change. See
> https://bugzilla.kernel.org/show_bug.cgi?id=42899 for instance.
> 
> I don't know why it *works*. It's depressingly effective though.
> 
> For the record:
> - the problem may go along IOMMU (AMD-Vi) errors but it really looks
>   like a red herring.
> - the patch sets the RX_MULTI_EN bit. If the 8168c doc is any guide,
>   the chipset now fetches several Rx descriptors at a time.
> - long ago the driver ignored the RX_MULTI_EN bit.
>   e542a2269f232d61270ceddd42b73a4348dee2bb changed the RxConfig
>   settings. Whatever the problem it's now labeled a regression.
> - Realtek's own driver can identify two different 8168evl devices
>   (CFG_METHOD_16 and CFG_METHOD_17) where the r8169 driver only
>   sees one. It sucks.
> 
> Signed-off-by: Francois Romieu <romieu@...zoreil.com>

Applied, thanks Francois.
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