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From: David Miller <davem@davemloft.net>
Subject: Re: [net-next PATCH 2/5] ethernet/intel: Use eth_skb_pad helper
Date: Tue, 25 Nov 2014 22:19:00 -0500 (EST)
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From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Tue, 25 Nov 2014 17:43:05 -0800

> I believe I finally have an idea why we had various + 15 in skb
> allocations in TCP stack !

It was so that you could do one level of tunneling with "for
free".  Or that is my recollection.

Those + 15 existed way before any of these padto() calls even
existed.