netdev - smsc75xx & smsc95xx, setting skb->truesize correctly?

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Message-ID: <20120820175706.12394vktsvm3yvqc@www.81.fi>
Date:	Mon, 20 Aug 2012 17:57:06 +0300
From:	Jussi Kivilinna <jussi.kivilinna@...et.fi>
To:	netdev@...r.kernel.org
Cc:	Steve Glendinning <steve.glendinning@...well.net>
Subject: smsc75xx & smsc95xx, setting skb->truesize correctly?

Hello,

Is setting skb->truesize in smsc75xx and smsc95xx correct?
In smsc75xx/smsc95xx_rx_fixup(), input skb containing multiple packets  
is cloned and truesize for each clone is set to packet-size +  
sizeof(struct sk_buff), but input skb has minimum allocation size of  
9000 bytes (MAX_SINGLE_PACKET_SIZE) and maximum of 18944 bytes  
(DEFAULT_HS_BURST_CAP_SIZE) (+ NET_IP_ALIGN). Doesn't this cause  
truesize to be underestimated?

-Jussi

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