user-space-net-plugin

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user-space-net-plugin

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VPP Agent written in GO, used by UserSpace CNI to interface with the VPP GO-API.

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// repository documentation

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# User Space CNI Plugin
This plugin is based on the **Vhostuser CNI plugin** provided by Intel
(https://github.com/intel/vhost-user-net-plugin). This rewrite was done to
address the following deficienies:
* **Vhostuser CNI plugin** is limited to vhost-user. Want to be able to use
other types of implementations.
* **Vhostuser CNI plugin** is written in GO. It is currently calling a python
script passed in from the input json. The python script then builds up a CLI
command (either VPP or OVS) and then executes the command in a shell command.
VPP has a GO API and would like to take advantage of that.

This code is a work in progress and has it's own set of deficienies:
* The input structures define in *usrsptypes* may not be the typical CNI layout
and probably need some adjustments.
* There is spot in the code to branch to OVS or Linux or some other
implementation, but only VPP has been implemented.
* Currently, all implentations are compiled in. Not a way to currently only
link in the implementation that are desired.
* Have only tested with the scripts provided with the Container Network
Interface (CNI) project. Have not tested with Multus or Kubernetes.
* Moved from a build script to a simple make file. Long term probably need
to go back to the build script, or at least add *install* functionality.
Only had one file to compile so went with simplicity for now. Make/Build
are not my strong suit.

# Build
To get and build the **UserSpace CNI** plugin:
```
   cd $GOPATH/src/
   go get github.com/Billy99/user-space-net-plugin
   cd github.com/Billy99/user-space-net-plugin
   make
```

Once the binary is built, it needs to be copied to the CNI directory:
```
   cp userspace/userspace $CNI_PATH/.
```

To perform a make clean:
```
   make clean
```

## Building cnivpp with OVS
The **UserSpace CNI** plugin builds the cnivpp library from the cnivpp
sub-folder. In order to run with the cnivpp library, VPP must be installed
on the system. If VPP should be installed but is not installed, see the
**Install VPP** section of the *cnivpp/README.md* for instructions.

If the desire is to run the cniovs library with OVS (i.e. - don't want
VPP installed), several files from a typical VPP install need to be on
the system to build. To install just these files and NOT VPP, run:
```
   cd $GOPATH/src/
   go get github.com/Billy99/user-space-net-plugin
   cd github.com/Billy99/user-space-net-plugin
   make install
```
This will install only the 5 or 6 files needed to build the cnivpp library.
To remove these files, run:
```
   make clean
```
*make install* requires several packages to execute, primarily *wget*,
*cpio* and *rpm2cpio*. If these packages are not installed on your system,
the following can be run to install the required packages:
```
   make install-dep
```
**NOTE:** *make install* has only been made to work for CentOS based systems.
Other platforms will be made to work long term. If there is an immediate need
for other platforms, please open an issue to expedite the feature
(https://github.com/Billy99/user-space-net-plugin/issues).

## Update dependencies (vendor/)
This project is currently using **glide**. To refresh or update the set
dependancies for this project, run:
```
   glide update --strip-vendor
```
This project currently checks in the *glide.lock* and files under the
*vendor* directory.

# Test

**TBD** - Haven't run this in a clean system. May need a few tweaks.

There are a few environmental variables used in this test. Here is an example:
```
   cat ~/.bashrc
   :
   export GOPATH=~/go
   export CNI_PATH=$GOPATH/src/github.com/containernetworking/plugins/bin

```

In order to test, a container with VPP 18.04 and vpp-app has been created:
```
  docker pull bmcfall/vpp-centos-userspace-cni:0.2.0
```

Setup your configuration file in your CNI directory. An example is
*/etc/cni/net.d/*.

**NOTE:** The *userspace* nectconf definition is still a work in progress. So
the example below is just an example, see *usrsptypes* for latest definitions.

Example of how to setup a configuration for a VPP memif interface between the
host and container:
```
sudo vi /etc/cni/net.d/90-userspace.conf 
{
	"cniVersion": "0.3.1",
        "type": "userspace",
        "name": "memif-network",
        "if0name": "net0",
        "host": {
                "engine": "vpp",
                "iftype": "memif",
                "netType": "bridge",
                "memif": {
                        "role": "master",
                        "mode": "ethernet"
                },
                "bridge": {
                        "bridgeId": 4
                }
        },
        "container": {
                "engine": "vpp",
                "iftype": "memif",
                "netType": "interface",
                "memif": {
                        "role": "slave",
                        "mode": "ethernet"
                }
        },
        "ipam": {
                "type": "host-local",
                "subnet": "192.168.210.0/24",
                "routes": [
                        { "dst": "0.0.0.0/0" }
                ]
        }
}
```

To test, currently using a local script (copied from CNI scripts:
https://github.com/containernetworking/cni/blob/master/scripts/docker-run.sh).
To run script:
```
   cd $GOPATH/src/github.com/containernetworking/cni/scripts
   sudo CNI_PATH=$CNI_PATH GOPATH=$GOPATH ./scripts/vpp-docker-run.sh -it --privileged vpp-centos-userspace-cni
```

**NOTE:** The *vpp-docker-run.sh* script mounts some volumes in the container. Change as needed:
* *-v /var/run/vpp/cni/shared:/var/run/vpp/cni/shared:rw*
  * Default location in VPP to create sockets is */var/run/vpp/*. Socket files (memif or vhost-user)
are passed to the container through a subdirectory of this base directory..
* *-v /var/run/vpp/cni/$contid:/var/run/vpp/cni/data:rw*
  * Current implementation is to write the remote configuration into a file and share the directory
with the container, which is the volume mapping. Directory is currently hard coded.
* *--device=/dev/hugepages:/dev/hugepages*
  * VPP requires hugepages, so need to map hugepoages into container.

In the container, you should see the vpp-app ouput the message sequence of
its communication with local VPP (VPP in the container) and some database
dumps interleaved.

To verify the local config, in another window:
```
vppctl show interface
vppctl show mode
vppctl show memif
```

## Debug
The *vpp-centos-userspace-cni* container runs a script at startup (in Dockefile CMD command) which
starts VPP and then runs *vpp-app*. Assuming the same notes above, to see what is happening in the container,
cause *vpp-centos-userspace-cni* container to start in bash and skip the script, then run VPP and *vpp-app* manually: 
```
   cd $GOPATH/src/github.com/containernetworking/cni/scripts
   sudo CNI_PATH=$CNI_PATH GOPATH=$GOPATH ./scripts/vpp-docker-run.sh -it --privileged bmcfall/vpp-centos-userspace-cni:0.2.0 bash
   
   /* Within Container: */
   vpp -c /etc/vpp/startup.conf &
   vpp-app
```

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