netdev - Re: [PATCH] datapath: Add basic MPLS support to kernel

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Date:	Wed, 12 Jun 2013 23:00:56 -0700
From:	Pravin Shelar <pshelar@...ira.com>
To:	Simon Horman <horms@...ge.net.au>
Cc:	Jesse Gross <jesse@...ira.com>,
	"dev@...nvswitch.org" <dev@...nvswitch.org>,
	netdev <netdev@...r.kernel.org>, Ravi K <rkerur@...il.com>,
	Isaku Yamahata <yamahata@...inux.co.jp>,
	Ben Pfaff <blp@...ira.com>,
	Jarno Rajahalme <jarno.rajahalme@....com>,
	Joe Stringer <joe@...d.net.nz>
Subject: Re: [PATCH] datapath: Add basic MPLS support to kernel

On Wed, Jun 12, 2013 at 6:19 PM, Simon Horman <horms@...ge.net.au> wrote:
> On Wed, Jun 12, 2013 at 06:14:07PM -0700, Pravin Shelar wrote:
>> On Tue, Jun 11, 2013 at 2:26 PM, Jesse Gross <jesse@...ira.com> wrote:
>> > On Mon, Jun 10, 2013 at 1:07 AM, Simon Horman <horms@...ge.net.au> wrote:

>> >> @@ -341,10 +376,14 @@ static int netdev_send(struct vport *vport, struct sk_buff *skb)
>> >>                                 nskb = skb->next;
>> >>                                 skb->next = NULL;
>> >>
>> >> -                               skb = __vlan_put_tag(skb, vlan_tx_tag_get(skb));
>> >> +                               if (vlan)
>> >> +                                       skb = __vlan_put_tag(skb, vlan_tx_tag_get(skb));
>> >>                                 if (likely(skb)) {
>> >>                                         len += skb->len;
>> >> -                                       vlan_set_tci(skb, 0);
>> >> +                                       if (mpls)
>> >> +                                               skb->protocol = mpls_protocol;
>> >> +                                       if (vlan)
>> >> +                                               vlan_set_tci(skb, 0);
>> >>                                         dev_queue_xmit(skb);
>> >>                                 }
>> >
>> > The order of setting the protocol field is different from the one
>> > below and I think this one isn't right because it means that the MPLS
>> > protocol can override the vlan.
>> >
>> > Pravin, can you take a look at this as well since you are working in
>> > the same area?
>>
>> I think this compatibility code can be moved to new compat code posted
>> on gre-restructuring code few changes.
>
> Sure that sounds reasonable but I am unsure of the status of those changes
> and I would rather not rely on something that isn't ready to merge yet.

Right. sorry abt delay.
But I think it is much closer now and it would be alot easy to handle
compatibility, so it is worth waiting for.
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