netdev - Re: [PATCH net-next] tun: don't require serialization lock on tx

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Message-Id: <20160418.143640.1078793728710842442.davem@davemloft.net>
Date:	Mon, 18 Apr 2016 14:36:40 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	pabeni@...hat.com
Cc:	netdev@...r.kernel.org, mst@...hat.com, hannes@...essinduktion.org,
	ebiederm@...ssion.com, gkurz@...ux.vnet.ibm.com,
	jasowang@...hat.com, edumazet@...gle.com
Subject: Re: [PATCH net-next] tun: don't require serialization lock on tx

From: Paolo Abeni <pabeni@...hat.com>
Date: Thu, 14 Apr 2016 18:39:39 +0200

> The current tun_net_xmit() implementation don't need any external
> lock since it relies on rcu protection for the tun data structure
> and on socket queue lock for skb queuing.
> 
> This patch set the NETIF_F_LLTX feature bit in the tun device, so
> that on xmit, in absence of qdisc, no serialization lock is acquired
> by the caller.
> 
> The user space can remove the default tun qdisc with:
> 
> tc qdisc replace dev <tun device name> root noqueue
> 
> Signed-off-by: Paolo Abeni <pabeni@...hat.com>
> Acked-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
> Acked-by: Eric Dumazet <edumazet@...gle.com>

Applied, thanks.