netdev - RE: [PATCH] qlcnic: dont assume NET_IP

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Date:	Mon, 20 Sep 2010 06:16:31 -0500
From:	Amit Salecha <amit.salecha@...gic.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Ameen Rahman <ameen.rahman@...gic.com>,
	Anirban Chakraborty <anirban.chakraborty@...gic.com>,
	David Miller <davem@...emloft.net>
Subject: RE: [PATCH] qlcnic: dont assume NET_IP_ALIGN is 2



> -----Original Message-----
> From: Eric Dumazet [mailto:eric.dumazet@...il.com]
> Sent: Friday, September 17, 2010 3:27 PM
> To: Amit Salecha
> Cc: netdev@...r.kernel.org; Ameen Rahman; Anirban Chakraborty; David
> Miller
> Subject: [PATCH] qlcnic: dont assume NET_IP_ALIGN is 2
> 
> Amit, I noticed following bug in qlnic driver.
> 
> Also, skb->truesize should not be changed by drivers, unless dealing
> with fragments.
> 
> When you have :
> 	skb->truesize = skb->len + sizeof(struct sk_buff);
> 
> you are lying to stack that can queue many "small" UDP packets,
> accouting for small packets in socket rcvbuf, while the truesize was
> really 1532 + sizeof(struct sk_buff)
> 
> Could you take a look ?
> 
> 
This can be cleaned up. 
Though I have one doubt. We are allocating larger packets than the actual data used.
Doesn't it will break accounting ?

-Amit