netdev - Re: [PATCH net-next v2 4/7] net: packet: use skb->dev as storage for skb orig len instead of skb->cb[]

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Message-Id: <20150228.142135.470339626705046722.davem@davemloft.net>
Date:	Sat, 28 Feb 2015 14:21:35 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	eyal.birger@...il.com
Cc:	willemb@...gle.com, edumazet@...gle.com, shmulik.ladkani@...il.com,
	linux-bluetooth@...r.kernel.org, marcel@...tmann.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH net-next v2 4/7] net: packet: use skb->dev as storage
 for skb orig len instead of skb->cb[]

From: Eyal Birger <eyal.birger@...il.com>
Date: Thu, 26 Feb 2015 21:07:01 +0200

> As part of an effort to move skb->dropcount to skb->cb[], 4 bytes
> of additional room are needed in skb->cb[] in packet sockets.
> 
> Store the skb original length in skb->dev instead of skb->cb[] for
> this purpose.
> 
> Signed-off-by: Eyal Birger <eyal.birger@...il.com>

I'm a little confused, why is this even needed?

packet_skb_cb is 24 bytes by my calculations, which is much
smaller than the cb[] size which is 48 bytes.
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