* Does rtnl_lock inhibit incoming traffic?
@ 2013-05-29 19:08 Oliver Hartkopp
2013-05-29 20:21 ` Eric Dumazet
0 siblings, 1 reply; 2+ messages in thread
From: Oliver Hartkopp @ 2013-05-29 19:08 UTC (permalink / raw)
To: Linux Netdev List
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
Regards,
Oliver
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Does rtnl_lock inhibit incoming traffic?
2013-05-29 19:08 Does rtnl_lock inhibit incoming traffic? Oliver Hartkopp
@ 2013-05-29 20:21 ` Eric Dumazet
0 siblings, 0 replies; 2+ messages in thread
From: Eric Dumazet @ 2013-05-29 20:21 UTC (permalink / raw)
To: Oliver Hartkopp; +Cc: Linux Netdev List
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.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2013-05-29 19:08 Does rtnl_lock inhibit incoming traffic? Oliver Hartkopp
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