netdev - Re: [ovs-dev] [PATCH net-next 12/12] openvswitch: Add gre tunnel support.

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Date:	Fri, 14 Jun 2013 19:18:37 -0700
From:	Pravin Shelar <pshelar@...ira.com>
To:	Jesse Gross <jesse@...ira.com>
Cc:	netdev <netdev@...r.kernel.org>,
	"dev@...nvswitch.org" <dev@...nvswitch.org>
Subject: Re: [ovs-dev] [PATCH net-next 12/12] openvswitch: Add gre tunnel support.

On Fri, Jun 14, 2013 at 5:31 PM, Jesse Gross <jesse@...ira.com> wrote:
> On Thu, Jun 13, 2013 at 11:25 AM, Pravin B Shelar <pshelar@...ira.com> wrote:
>> diff --git a/net/openvswitch/vport-gre.c b/net/openvswitch/vport-gre.c
>> new file mode 100644
>> index 0000000..0420237
>> --- /dev/null
>> +++ b/net/openvswitch/vport-gre.c
>> +/* Called with rcu_read_lock and BH disabled. */
>> +static int gre_rcv(struct sk_buff *skb,
>> +                  const struct tnl_ptk_info *tpi)
>> +{
>> +       struct ovs_key_ipv4_tunnel tun_key;
>> +       struct ovs_net *ovs_net;
>> +       struct vport *vport;
>> +       __be64 key;
>> +
>> +       ovs_net = net_generic(dev_net(skb->dev), ovs_net_id);
>> +       vport = rcu_dereference(ovs_net->vport_net.gre_vport);
>> +       if (unlikely(!vport))
>> +               return PACKET_REJECT;
>> +
>> +       key = key_to_tunnel_id(tpi->key, tpi->seq);
>> +       ovs_flow_tun_key_init(&tun_key, ip_hdr(skb), key, tpi->flags);
>
> I would probably filter the flags coming in, just in case another
> module adds a new flag that we're not expecting.
>
ok.

>> +static int gre_tnl_send(struct vport *vport, struct sk_buff *skb)
>> +{
> [...]
>> +       /* Allow our local IP stack to fragment the outer packet even
>> +        * if the DF bit is set as a last resort.  We also need to
>> +        * force selection of an IP ID here because Linux will
>> +        * otherwise leave it at 0 if the packet originally had DF set.
>> +        */
>> +
>> +       skb->local_df = 1;
>
> Are we actually doing the IP ID selection here that the comment is referring to?
>
right. I need to move this comment to ip-tunnel code.

>> diff --git a/net/openvswitch/vport.c b/net/openvswitch/vport.c
>> index ef0bb5f..286c12a 100644
>> --- a/net/openvswitch/vport.c
>> +++ b/net/openvswitch/vport.c
>> @@ -38,6 +38,7 @@
>>  static const struct vport_ops *vport_ops_list[] = {
>>         &ovs_netdev_vport_ops,
>>         &ovs_internal_vport_ops,
>> +       &ovs_gre_vport_ops,
>>  };
>
> I think we need some config guards to check that the GRE and IP tunnel
> modules are available in the current kernel.
ok.
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