netdev - Re: Does rtnl_lock inhibit incoming traffic?

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Message-ID: <1369858880.5109.82.camel@edumazet-glaptop>
Date:	Wed, 29 May 2013 13:21:20 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Oliver Hartkopp <socketcan@...tkopp.net>
Cc:	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: Does rtnl_lock inhibit incoming traffic?

On Wed, 2013-05-29 at 21:08 +0200, Oliver Hartkopp wrote:
> Hello,
> 
> AFAIK the rtnl_lock is used (at least) to protect the configuration of
> netdevices and routing tables.
> 
> Is the reception of incoming traffic inhibited while the rtnl_lock is set, or
> would i need to protect the data structures to be modified with an additional
> spinlock_bh() / write_lock_bh()?
> 
> Like this one here:
> 
> http://lxr.linux.no/#linux+v3.9.4/net/ipv6/ip6mr.c#L1573

Reception of incoming traffic is not inhibited by rtnl.

And spinlock_bh()/write_lock_bh() only disable current cpu from
receiving frames, but other cpus can still handle incoming traffic.

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