netdev - Re: [PATCH net-next] openvswitch: Make metadata_dst tunnel work in IP_TUNNEL_INFO

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Date:   Sat, 23 Mar 2019 14:39:47 -0700
From:   Pravin Shelar <pshelar@....org>
To:     wenxu <wenxu@...oud.cn>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        ovs dev <dev@...nvswitch.org>
Subject: Re: [PATCH net-next] openvswitch: Make metadata_dst tunnel work in
 IP_TUNNEL_INFO_BRIDGE mode

On Sat, Mar 23, 2019 at 2:18 AM wenxu <wenxu@...oud.cn> wrote:
>
> On 2019/3/23 下午3:50, Pravin Shelar wrote:
>
> On Thu, Mar 21, 2019 at 3:34 AM <wenxu@...oud.cn> wrote:
>
> From: wenxu <wenxu@...oud.cn>
>
> There is currently no support for the multicasti/broadcst aspects
> of VXLAN in ovs. In the datapath flow the tun_dst must specific.
> But in the IP_TUNNEL_INFO_BRIDGE mode the tun_dst can not be specific.
> And the packet can forward through the fdb of vxlan devcice. In
> this mode the broadcast/multicast packet can be sent through the
> following ways in ovs.
>
> ovs-vsctl add-port br0 vxlan -- set in vxlan type=vxlan \
>         options:key=1000 options:remote_ip=flow
> ovs-ofctl add-flow br0 in_port=LOCAL,dl_dst=ff:ff:ff:ff:ff:ff,\
>         action=output:vxlan
>
> bridge fdb append ff:ff:ff:ff:ff:ff dev vxlan_sys_4789 dst 172.168.0.1 \
>         src_vni 1000 vni 1000 self
> bridge fdb append ff:ff:ff:ff:ff:ff dev vxlan_sys_4789 dst 172.168.0.2 \
> src_vni 1000 vni 1000 self
>
> This would make datapath bit complicated, can you give example of such use-case?
>
> There is currently no support for the multicast/broadcast aspects
> of VXLAN in ovs. To get around the lack of multicast support, it is possible to
> pre-provision MAC to IP address mappings either manually or from a controller.
>
> With this patch we can achieve this through the fdb of the lower vxlan
> device.
>
> For example. three severs connects with vxlan.
> server1 IP 10.0.0.1 tunnel IP  172.168.0.1 vni 1000
> server2 IP 10.0.0.2 tunnel IP  172.168.0.2 vni 1000
> server3 IP 10.0.0.3 tunnel IP  172.168.0.3 vni 1000
>
> All the broadcast arp request from server1, can be send to vxlan_sys_4789
> in IP_TUNNEL_INFO_BRIDGE mode. Then the broadcast packet can send through
> the fdb table in the vxlan device as following:
>
> bridge fdb append ff:ff:ff:ff:ff:ff dev vxlan_sys_4789 dst 172.168.0.1 \
>         src_vni 1000 vni 1000 self
> bridge fdb append ff:ff:ff:ff:ff:ff dev vxlan_sys_4789 dst 172.168.0.2 \
> src_vni 1000 vni 1000 self
>
>
> Not any for multicast case. This patch make ovs vxlan tunnel using the fdb
> table of lower vxlan device.

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