linux-kernel - Re: [PATCH v3 net-next 1/4] net: implement support for low latency socket polling

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Date:	Tue, 21 May 2013 10:51:26 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Pekka Riikonen <priikone@....fi>
Cc:	Eliezer Tamir <eliezer.tamir@...ux.intel.com>,
	Dave Miller <davem@...emloft.net>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Don Skidmore <donald.c.skidmore@...el.com>,
	e1000-devel@...ts.sourceforge.net,
	Willem de Bruijn <willemb@...gle.com>,
	Andi Kleen <andi@...stfloor.org>, HPA <hpa@...or.com>,
	Eliezer Tamir <eliezer@...ir.org.il>
Subject: Re: [PATCH v3 net-next 1/4] net: implement support for low latency
 socket polling

On Tue, 2013-05-21 at 10:48 -0700, Eric Dumazet wrote:

> We do not keep skb->dev information once a packet leaves the rcu
> protected region.
> 
> Once packet is queued to tcp input queues, skb->dev is NULL.

This is done in tcp_v4_rcv() & tcp_v6_rcv()



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