linux-kernel - Re: [PATCH net 3/3] Drivers: net: hyperv: Address UDP checksum issues

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Message-Id: <20140409.143655.2112963679697366338.davem@davemloft.net>
Date:	Wed, 09 Apr 2014 14:36:55 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	kys@...rosoft.com
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org, olaf@...fle.de, apw@...onical.com,
	jasowang@...hat.com
Subject: Re: [PATCH net 3/3] Drivers: net: hyperv: Address UDP checksum
 issues

From: KY Srinivasan <kys@...rosoft.com>
Date: Wed, 9 Apr 2014 18:08:47 +0000

> Thanks Dave. I will COW the SKB before changing the checksum
> value. I do have a question though.  I looked at a bunch of hardware
> drivers and they modify the header information, specially checksum
> field and I could not see where they had COWed the skb. I was
> grepping for skb_cow in these drivers.

Look for skb_cow_head(), for example, the tg3.c driver uses this.


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