linux-kernel - RE: [PATCH] ipheth.c: Enable IP header alignment

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Message-ID: <710D4D6CE160654C87478D18385BB9971BE3FDCA46@MDC-MAIL-CMS01.ubisoft.org>
Date:	Tue, 3 May 2011 13:18:39 -0400
From:	David Hill <david.hill@...soft.com>
To:	L. Alberto Giménez <agimenez@...valve.es>,
	Ben Hutchings <bhutchings@...arflare.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"dgiagio@...il.com" <dgiagio@...il.com>,
	"dborca@...oo.com" <dborca@...oo.com>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"pmcenery@...il.com" <pmcenery@...il.com>,
	"open list:USB SUBSYSTEM" <linux-usb@...r.kernel.org>,
	"open list:NETWORKING DRIVERS" <netdev@...r.kernel.org>
Subject: RE: [PATCH] ipheth.c: Enable IP header alignment

Maybe I can help on this part.

Git ?

I'm using ubuntu natty ... The part  I'm not sure of is , do I patch ubuntu's kernel or I start from scratch?


-----Original Message-----
From: L. Alberto Giménez [mailto:agimenez@...valve.es] 
Sent: 3 mai 2011 12:58
To: Ben Hutchings
Cc: linux-kernel@...r.kernel.org; dgiagio@...il.com; dborca@...oo.com; davem@...emloft.net; pmcenery@...il.com; David Hill; open list:USB SUBSYSTEM; open list:NETWORKING DRIVERS
Subject: Re: [PATCH] ipheth.c: Enable IP header alignment

On Mon, May 02, 2011 at 10:04:34PM +0100, Ben Hutchings wrote:
> So this was using NET_IP_ALIGN as an offset into the URB.  Which was
> totally bogus, as its value has long been architecture-dependent.  The
> code is also claiming to put len bytes but only copying len - delta.
> 
> The correct code would be something like:
> 
> 	if (urb->actual_length <= IPHETH_IP_ALIGN) {
> 		dev->net->stats.rx_length_errors++;
> 		return;
> 	}
> 	len = urb->actual_length - IPHETH_IP_ALIGN;
> 	buf = urb->transfer_buffer + IPHETH_IP_ALIGN;
> 	
> 	dev_alloc_skb(len);
> 	...
> 	memcpy(skb_put(skb, len), buf, len);

Thanks for the response Ben.

I can try to change the code, but I don't own the device anymore. Changing the
code without being able to test it would be walking blindfolded :-/

If upstrem (everyone involved is in CC) can't do it, I can submit the changes
advised by Ben, but I can't warantee anything beyond successful compilation. I
don't think that it would be acceptable here.

Regards,
-- 
L. Alberto Giménez
JabberID agimenez@...ber.sysvalve.es
GnuPG key ID 0x3BAABDE1
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