netdev - Re: [PATCH net] gre: Fix MTU sizing check for gretap tunnels

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Date:	Thu, 11 Jul 2013 16:30:49 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	pshelar@...ira.com
Cc:	eric.dumazet@...il.com, alexander.h.duyck@...el.com,
	netdev@...r.kernel.org, jesse@...ira.com
Subject: Re: [PATCH net] gre: Fix MTU sizing check for gretap tunnels

From: Pravin Shelar <pshelar@...ira.com>
Date: Thu, 11 Jul 2013 16:19:17 -0700

> gre is been using dev->hard_header_len rather than
> rt_dev->hard_header_len for long time which does not look right.

I noticed this as well.

I would suggest implementing these calculations in small discrete
helper functions, with big comments.  Right now the code is hard
to understand even by experts.
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