netdev - Re: [PATCH] sky2: make sure ethernet header is in transmit skb

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Message-Id: <20100103.213258.263977883.davem@davemloft.net>
Date:	Sun, 03 Jan 2010 21:32:58 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	shemminger@...ux-foundation.org
Cc:	mbreuer@...jas.com, akpm@...ux-foundation.org, flyboy@...il.com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] sky2: make sure ethernet header is in transmit skb

From: David Miller <davem@...emloft.net>
Date: Sat, 26 Dec 2009 20:11:07 -0800 (PST)

> From: David Miller <davem@...emloft.net>
> Date: Sat, 26 Dec 2009 19:44:18 -0800 (PST)
> 
>> From: Stephen Hemminger <shemminger@...ux-foundation.org>
>> Date: Sat, 26 Dec 2009 14:05:44 -0800
>> 
>>> Other drivers may have same problem, I really think this ought
>>> to be done at higher level.
>> 
>> I tend to agree with you, and I thought we had handled all
>> cases.  Let's simply make AF_PACKET linearize the link
>> level header before sending things out to the transmit path.
>> 
>> I can work on this if you want.
> 
> Actually Stephen, I took a look and I can't see how AF_PACKET
> can create this situation.
> 
> It always copies into the linear area of the SKB it allocates
> for sendmsg() processing.  Whether the data comes from sendmsg
> data or the mmap() ring buffer.

Stephen can you get a backtrace of the code path which triggers
this?  I want to fix it at a higher level too, but I can't
do that until I know where it actually happens.

Thanks!
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