Support SR-IOV in Networking-Ovn

Registered by wangqianyu on 2017-04-21

In hierarchical network topologies, it's very possible that ovs need to link to sriov computer node as a ToR switch. Thus, OVN support SR-IOV computer nod with hierarchical network topologies is a essential requirement.

                        +-------------+
                        |             |
                        | Core Switch |
                        |             |
                        +---+-----+---+
                VXLAN       |     |       VXLAN
                +-----------+     +------------+
                |                              |
         +------+-----+                 +------+-----+
         |            |                 |            |
         | ToR Switch |                 | ToR Switch |
  | (OVS) | | (OVS) |
         |            |                 |             | |
         +---+---+----+                 +---+----+---+
     VLAN    |   |   VLAN           VLAN    |    |    VLAN
     +-------+   +----+                +----+    +------+
     |     SRIOV      |        SRIOV        |         SRIOV   | SRIOV |
+----+----+      +----+----+      +----+----+      +----+----+
|         |      |         |      |         |      |         |
| Compute |      | Compute |      | Compute |      | Compute |
| Node     |      | Node     |      | Node     |      | Node    |
|         |      |         |      |         |      |         |
+---------+      +---------+      +---------+      +---------+

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