netdev - Re: [PATCH net 2/2] ip_tunnel: Add fallback tunnels to the hash lists

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Date:	Fri, 27 Sep 2013 19:40:34 -0700
From:	Pravin Shelar <pshelar@...ira.com>
To:	Steffen Klassert <steffen.klassert@...unet.com>
Cc:	David Miller <davem@...emloft.net>, netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net 2/2] ip_tunnel: Add fallback tunnels to the hash lists

On Fri, Sep 27, 2013 at 12:56 AM, Steffen Klassert
<steffen.klassert@...unet.com> wrote:
> On Thu, Sep 26, 2013 at 11:24:07AM -0700, Pravin Shelar wrote:
>> On Thu, Sep 26, 2013 at 1:13 AM, Steffen Klassert
>> <steffen.klassert@...unet.com> wrote:
>> > On Wed, Sep 25, 2013 at 09:03:11AM -0700, Pravin Shelar wrote:
>> >> fallback tunnel s not required to be in hash table, Its is returned if
>> >> none of hashed tunnels are matched, ref ip_tunnel_lookup().
>> >> Can you post command to reproduce this issue?
>> >>
>> >
>> > Something like
>> >
>> > ip tunnel change tunl0 mode ipip remote 0.0.0.0 local 0.0.0.0 ttl 0 tos 1
>> >
>> > worked until v3.9 and stopped working with v3.10.
>>
>> OK, I see the bug, tunnel exact match lookup does not check fb tunnel.
>> There are two options.
>> 1. Fix ip_tunnel_find() to check for fb tunnel.
>> 2. Add fb tunnel to hash table, which is what ur patch does.
>> I think your patch is better solution as it get rid of special case.
>> But patch is not complete. It needs to remove fb tunnel checks on
>> netdev unregister.
>
> It looks like this is another bug that requires an additional patch.
> We add the fallback tunnel to the unregister list when we iterate over
> all netdevices in the namespace at the beginning of ip_tunnel_destroy()
> and then again explicitly at the end of ip_tunnel_destroy().

right.
And if the special case is removed, code will become simple.
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