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

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Date:	Tue, 21 May 2013 10:48:19 -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 19:02 +0200, Pekka Riikonen wrote:

> Maybe even that's not needed.  Couldn't skb->queue_mapping give the 
> correct NAPI instance in multiqueue nics?  The NAPI instance could be made 
> easily available from skb->dev.  In any case an index is much better than 
> a new pointer.

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.



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