Add support for multiple physnets for sr-iov

Update config plugin config
Add readable error message on exception

Change-Id: Ie22de349582abc34d7e62570118022463f835d64
Signed-off-by: ahothan <ahothan@cisco.com>

1 files changed, 60 insertions, 0 deletions

diff --git a/docs/testing/user/userguide/sriov.rst b/docs/testing/user/userguide/sriov.rst
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+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. SPDX-License-Identifier: CC-BY-4.0
+.. (c) Cisco Systems, Inc
+
+
+Testing SR-IOV
+==============
+
+NFVbench supports SR-IOV with the PVP and PVVP packet flows. SR-IOV support is not applicable for external chains since the networks have to be setup externally (and can themselves be pre-set to use SR-IOV or not).
+
+Pre-requisites
+--------------
+To test SR-IOV you need to have compute nodes configured to support one or more SR-IOV interfaces (also knows as PF or physical function) and you need OpenStack to be configured to support SR-IOV.
+You will also need to know:
+- the name of the physical networks associated to your SR-IOV interfaces (this is a configuration in Nova compute)
+- the VLAN range that can be used on the switch ports that are wired to the SR-IOV ports. Such switch ports are normally configured in trunk mode with a range of VLAN ids enabled on that port
+
+For example, in the case of 2 SR-IOV ports per compute node, 2 physical networks are generally configured in OpenStack with a distinct name. The VLAN range to use is is also allocated and reserved by the network administrator and in coordination with the corresponding top of rack switch port configuration.
+
+
+Configuration
+-------------
+To enable SR-IOV test, you will need to provide the following configuration options to NFVbench (in the configuration file).
+This example instructs NFVbench to create the left and right networks of a PVP packet flow to run on 2 SRIOV ports named "phys_sriov0" and "phys_sriov1" using resp. segmentation_id 2000 and 2001:
+
+.. code-block:: bash
+    
+    internal_networks:
+       left:
+           segmentation_id: 2000
+           physical_network: phys_sriov0
+       right:
+           segmentation_id: 2001
+           physical_network: phys_sriov1
+
+The segmentation ID fields must be different.
+In the case of PVVP, the middle network also needs to be provisioned properly.
+The same physical network can also be shared by the virtual networks but with different segmentation IDs.
+
+
+NIC NUMA socket placement and flavors
+-------------------------------------
+If the 2 selected ports reside on NICs that are on different NUMA sockets, you will need to explicitly tell Nova to use 2 numa nodes in the flavor used for the VMs in order to satisfy the filters, for example:
+
+.. code-block:: bash
+
+    flavor:
+      # Number of vCPUs for the flavor
+      vcpus: 2
+      # Memory for the flavor in MB
+      ram: 8192
+      # Size of local disk in GB
+      disk: 0
+      extra_specs:
+          "hw:cpu_policy": dedicated
+          "hw:mem_page_size": large
+          "hw:numa_nodes": 2
+
+Failure to do so might cause the VM creation to fail with the Nova error "Instance creation error: Insufficient compute resources: Requested instance NUMA topology together with requested PCI devices cannot fit the given host NUMA topology."
+