On Fri, Nov 15, 2013 at 06:10:19PM +0900, Simon Horman wrote:
> The aim of this patch is to provide infrastructure to differentiate
> between OpenFlow1.1 - 1.2 and OpenFlow1.3+ consistency checking. It
> also provides enhanced OpenFlow1.0 consistency checking.
>
> Some different versions of OpenFlow require different consistency
> checking.
>
> 1. OpenFlow1.0
>
> This variant implicitly pushes a VLAN tag if one doesn't exist
> and an action to modify a VLAN tag is encountered.
>
> MPLS push is supported as a Nicira extension whose behaviour is
> the same as OpenFlow1.1 - 1.2.
>
> In practice Open vSwitch allows inconsistent OpenFlow 1.0 actions so
> this portion of the change is just for completeness. I do not believe it
> has any run-time affect. And I would not be opposed to folding this case
> into the handling of OpenFlow1.1 - 1.2.
>
> 2. OpenFlow1.1 - 1.2
>
> This does not have the implicit VLAN tag push behaviour of OpenFlow1.0.
>
> An MPLS push action pushes an MPLS LSE after any VLAN tags that are
> present. This is pre-OpenFlow1.3 tag ordering.
>
> 3. OpenFlow1.3+
>
> This does not have the implicit VLAN tag push behaviour of OpenFlow1.0.
>
> An MPLS push action pushes an MPLS LSE before any VLAN tags that are
> present. This is OpenFlow1.3+ tag ordering. Its implication
> is that after an MPLS push action a packet is no longer a VLAN
> packet as there are no longer any VLAN tags immediately after
> the ethernet header: there is now an MPLS LSE there.
>
> Currently Open vSwitch does not implement OpenFlow1.3+ tag ordering
> so this patch uses the same consistency checking for OpenFlow1.3+
> as for OpenFlow1.1 - 1.2.
>
> A subsequent patch, which implements OpenFlow1.3+ tag ordering,
> makes use of the infrastructure provided by this patch to check
> actions accordingly.
>
> Unfortunately ofpact_get_SET_VLAN_VID(a)->push_vlan_if_needed and similar
> devices can't be used in order to implement logic as they are not set when
> when ofpact_check__() is called via parse_ofp_str().
>
> Instead this patch takes the approach of adding an OpenFlow version
> parameter to ofpact_check__().
>
> A new function ofpact_check_usable_protocols() allows trimming the
> usable_protocols based on action checking.
>
> The net effect of this change on run-time is only to increase logging under
> some circumstances as ofpacts_check() may now be called up to four times
> instead of up to twice for each invocation of parse_ofp_str__()
>
> Signed-off-by: Simon Horman <ho...@verge.net.au>
I think I have a better way. I posted patches:
http://openvswitch.org/pipermail/dev/2013-November/033968.html
http://openvswitch.org/pipermail/dev/2013-November/033967.html
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