netdev - Re: [Patch net-next] vxlan: revert "vxlan: Bypass encapsulation if the destination is local"

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Date:	Thu, 11 Apr 2013 10:10:15 +0800
From:	Cong Wang <amwang@...hat.com>
To:	Sridhar Samudrala <sri@...ibm.com>
Cc:	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>
Subject: Re: [Patch net-next] vxlan: revert "vxlan: Bypass encapsulation if
 the destination is local"

On Tue, 2013-04-09 at 11:08 -0700, Sridhar Samudrala wrote:
> On Tue, 2013-04-09 at 17:57 +0800, Cong Wang wrote:
> > From: Cong Wang <amwang@...hat.com>
> > 
> > This reverts commit 9dcc71e1fdbb7aa10d92a3d35e8a201adc84abd0.
> > It apparently breaks my vxlan tests between different namespaces.
> > 
> I haven't tried vxlan with network namespaces.
> This patch effects the following 2 code paths
> - when source and destination endpoints are on the same bridge and
>   route short-circuiting is enabled. I guess you are not hitting
>   this path as this is possible only if you specify 'rsc' flag when
>   creating vxlan device.

No, I didn't specify this flag.

> - when source and destination endpoints belonging to different vni's
>   are on 2 different bridges on the same host. encap bypass is done
>   in this scenario by checking if rt_flags has RTCF_LOCAL set. I think
>   you must be hitting this path and the following patch should fix
>   it by only doing bypass if the source and dest devices belong to 
>   the same net. Can you try it and see if it fixes your tests?

I just tested it, unfortunately it doesn't work, the bug still exists.

If you need any other info, please let me know.

Thanks.

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