netdev - Re: [RFC PATCH v2] Gemini: Gigabit ethernet driver

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Message-ID: <20101228114520.GA17774@rere.qmqm.pl>
Date:	Tue, 28 Dec 2010 12:45:20 +0100
From:	Michał Mirosław <mirq-linux@...e.qmqm.pl>
To:	Hans Ulli Kroll <ulli.kroll@...glemail.com>
Cc:	gemini-board-dev@...ts.berlios.de, netdev@...r.kernel.org,
	Christoph Biedl <linux-kernel.bfrz@...chmal.in-ulm.de>
Subject: Re: [RFC PATCH v2] Gemini: Gigabit ethernet driver

On Mon, Dec 27, 2010 at 08:21:44PM +0100, Hans Ulli Kroll wrote:
> On Mon, 27 Dec 2010, Michał Mirosław wrote:
> > +		.dis_tx = 1,
> > +		.dis_rx = 1,
> > +		.max_len = 2,	/* magic; 512 << max_len? */
> > +		.ipv4_rx_chksum = 1,
> > +		.ipv6_rx_chksum = 1,
> 
> This is what I found in some netbsd code for maxlen
> 
> #define	CONFIG0_MAXLEN_MASK			__BITS(8,10)
> #define	CONFIG0_MAXLEN_GET(x)			(((x) >> 8) & 
> CONFIG0_MAXLEN_MASK)
> #define	CONFIG0_MAXLEN(x)			(((x) & 
> CONFIG0_MAXLEN_MASK) << 8)
> #define	CONFIG0_MAXLEN_1536			0
> #define	CONFIG0_MAXLEN_1518			1
> #define	CONFIG0_MAXLEN_1522			2
> #define	CONFIG0_MAXLEN_1548			3
> #define	CONFIG0_MAXLEN_JUMBO			4
> 
> spec. for the SL3616 says jumbo is 9k frames, but i didn't proved this.

This is what I got after quick testing:

max_len rx_max
0       1536
1       1518
2       1522
3       1542
4       9212
5       10236
6       1518
7       1518

rx_max is total packet's length (MAC header + (VLAN) + payload).
 
Best Regards,
Michał Mirosław
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