netdev - Re: [PATCH net-next v2 1/2] openvswitch: Use regular GRE net

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Message-ID: <CALnjE+q-sBLWE5WPY451YYG8zv9g2E00aKkRHGo1cDf+xGAGnA@mail.gmail.com>
Date:	Mon, 3 Aug 2015 22:51:02 -0700
From:	Pravin Shelar <pshelar@...ira.com>
To:	Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:	David Miller <davem@...emloft.net>, netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next v2 1/2] openvswitch: Use regular GRE net_device
 instead of vport

On Mon, Aug 3, 2015 at 9:23 PM, Alexei Starovoitov
<alexei.starovoitov@...il.com> wrote:
> On Mon, Aug 03, 2015 at 05:27:26PM -0700, Pravin B Shelar wrote:
>> With addition of flow based tunneling, there is no need to
>> have special GRE vport. Removes all of the OVS specific
>> GRE code and make OVS use a ip_gre net_device.
>> Minimal GRE vport is kept to handle compatibility with
>> current userspace application.
>>
>> Signed-off-by: Pravin B Shelar <pshelar@...ira.com>
> ...
>> +#define GRE_TAP_FB_NAME "gretap0"
> ...
>> +     /* fallback device is used for flow based tunneling. */
>> +     if (!strcmp(dev->name, GRE_TAP_FB_NAME)) {
>> +             struct ip_tunnel *t;
>> +
>> +             t = netdev_priv(dev);
>> +             t->flow_based_tunnel = true;
>> +             eth_hw_addr_random(dev);
>> +             netif_keep_dst(dev);
>> +     }
>> +
>
> feature detection based on netdev name?
> meaning that there will be only one such device for the whole
> host? and namespaces cannot have their own gre tunnels?
> (since host 'gretap0' cannot be seen in netns)
>
gretap0 exist in every namespace. This device is created in GRE namespce init.
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