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

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Date:	Mon, 25 Jun 2012 11:31:50 +0800
From:	hayeswang <hayeswang@...ltek.com>
To:	'Francois Romieu' <romieu@...zoreil.com>
CC:	<netdev@...r.kernel.org>, <thomas.pi@...or.de>
Subject: RE: [PATCH] r8169: RxConfig hack for the 8168evl.

Hi, 

> - 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.

The definition of the IO 0x44 bit 14 is opposite for new chips.
For 8111C, 0 means fetching one Rx descriptor, and 1 means fetching
multi-descriptors.
For 8111D and the later chips, 0 means fetching multi-descriptors, and 1 means
fetching one Rx descriptor.

However, I have no idea about why it influences the issue.

> - 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.

The CFG_METHOD_16 is the internal test chip. We don't have mass production for
it. Even it could be removed from driver. I don't think the kernel have to
support it.

Best Regards,
Hayes

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