netdev - Re: [PATCH net-next v5 3/3] openvswitch: New MPLS actions for layer 2 tunnelling

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Date:   Sat, 21 Dec 2019 09:26:04 -0800
From:   Pravin Shelar <pshelar@....org>
To:     Martin Varghese <martinvarghesenokia@...il.com>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>, scott.drennan@...ia.com,
        Jiri Benc <jbenc@...hat.com>,
        "Varghese, Martin (Nokia - IN/Bangalore)" <martin.varghese@...ia.com>
Subject: Re: [PATCH net-next v5 3/3] openvswitch: New MPLS actions for layer 2 tunnelling

On Fri, Dec 20, 2019 at 7:21 PM Martin Varghese
<martinvarghesenokia@...il.com> wrote:
>
> From: Martin Varghese <martin.varghese@...ia.com>
>
> The existing PUSH MPLS action inserts MPLS header between ethernet header
> and the IP header. Though this behaviour is fine for L3 VPN where an IP
> packet is encapsulated inside a MPLS tunnel, it does not suffice the L2
> VPN (l2 tunnelling) requirements. In L2 VPN the MPLS header should
> encapsulate the ethernet packet.
>
> The new mpls action ADD_MPLS inserts MPLS header at the start of the
> packet or at the start of the l3 header depending on the value of l3 tunnel
> flag in the ADD_MPLS arguments.
>
> POP_MPLS action is extended to support ethertype 0x6558.
>
> Signed-off-by: Martin Varghese <martin.varghese@...ia.com>
> ---
> Changes in v2:
>    - PTAP_POP_MPLS action removed.
>    - Special handling for ethertype 0 added in PUSH_MPLS.
>    - Refactored push_mpls function to cater existing push_mpls and
>      ptap_push_mpls actions.
>    - mac len to specify the MPLS header location added in PTAP_PUSH_MPLS
>      arguments.
>
> Changes in v3:
>    - Special handling for ethertype 0 removed.
>    - Added support for ether type 0x6558.
>    - Removed mac len from PTAP_PUSH_MPLS argument list
>    - used l2_tun flag to distinguish l2 and l3 tunnelling.
>    - Extended PTAP_PUSH_MPLS handling to cater PUSH_MPLS action also.
>
> Changes in v4:
>    - Removed extra blank lines.
>    - Replaced bool l2_tun with u16 tun flags in
>      struct ovs_action_ptap_push_mpls.
>
> Changes in v5:
>    - Renamed PTAP_PUSH_MPLS action to ADD_MPLS.
>    - Replaced l2 tunnel flag with l3 tunnel flag.
>    - In ADD_MPLS configuration, the code to check for l2 header is
>      changed from (mac_proto != MAC_PROTO_NONE) to
>      (mac_proto == MAC_PROTO_ETHERNET).
>
>  include/uapi/linux/openvswitch.h | 31 +++++++++++++++++++++++++++++++
>  net/openvswitch/actions.c        | 30 ++++++++++++++++++++++++------
>  net/openvswitch/flow_netlink.c   | 34 ++++++++++++++++++++++++++++++++++
>  3 files changed, 89 insertions(+), 6 deletions(-)
>
Looks good to me.
Acked-by: Pravin B Shelar <pshelar@....org>

Thanks.