netdev - Re: Fwd: Re: RTL 8169 linux driver question

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Date:	Mon, 26 Nov 2012 08:35:26 +0100
From:	Stéphane ANCELOT <sancelot@...e.fr>
To:	Francois Romieu <romieu@...zoreil.com>
CC:	netdev@...r.kernel.org, sancelot@...alliance.com,
	Hayes Wang <hayeswang@...ltek.com>
Subject: Re: Fwd: Re: RTL 8169  linux driver question

On 23/11/2012 20:20, Francois Romieu wrote:
> Stéphane ANCELOT <sancelot@...e.fr> :
> [...]
>> I have an adapted version of this driver for a realtime linux kernel
>> and a 8168/811B rev 2 component (as listed by lspci).
> You should grep for the XID line in the kernel dmesg to identify
> the chipset version.
XID 1c4000c0
>> I had problem with it, my application sends a frame that is
>> immediately transmitted back by some slaves, there was abnormally
>> 100us lost between the send and receive call.
>>
>> Finally I found it was coming from the following register setup in
>> the driver :
>>
>> RTL_W16(IntrMitigate, 0x5151);
>>
>> Can you give me some details about it, since I do not have the
>> RTL8169 programming guide.
> "Reserved" in my 2007 8168c rev1.0 datasheet.
>
> I merged it long ago from Realtek's driver. It has now changed to 0x5f51.
>
> On the old PCI 8169, bits 15..8 relate to Tx and 7..0 to Rx. Bits 7..4
> count in units of 125 us and bits 0..3 in packet units. You may give
> 0x..00 a try.
>
> Hayes knows better for the 8168 line.
>
>> /100us is important since this component acts as an Ethercat Master
>> running at 1ms./
> Which realtime kernel is it ?
xenomai.

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