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diff --git a/docs/usecases/vhost/vhost.rst b/docs/usecases/vhost/vhost.rst new file mode 100644 index 00000000000..f62faade306 --- /dev/null +++ b/docs/usecases/vhost/vhost.rst @@ -0,0 +1,115 @@ +.. toctree:: + +.. _vhost01: + +Prerequisites +------------- + +For this use case we will assume FD.io VPP is installed. We will also assume the user can create and start +basic virtual machines. This use case will use the linux virsh commands. For more information on virsh +refer to `virsh man page <https://linux.die.net/man/1/virsh>`_. + +The image that we use is based on an Ubuntu cloud image downloaded from: +`Ubuntu Cloud Images <https://cloud-images.ubuntu.com/xenial/current>`_. + +All FD.io VPP commands are being run from a su shell. + +.. _vhosttopo: + +Topology +--------- + +In this case we will use 2 systems. One system we will be running standard linux, the other will +be running FD.io VPP. + +.. figure:: /_images/vhost-topo.png + :alt: + + Vhost Use Case Topology + +Creating The Virtual Interface +------------------------------ + +We will start on the system running FD.io VPP and show that no Virtual interfaces have been created. +We do this using the :ref:`showintcommand` command. + +Notice we do not have any virtual interfaces. We do have an interface (TenGigabitEthernet86/0/0) that +is up. This interface is connected to a system running, in our example standard linux. We will use +this system to verify our connectivity to our VM with ping. + +.. code-block:: console + + $ sudo bash + # vppctl + _______ _ _ _____ ___ + __/ __/ _ \ (_)__ | | / / _ \/ _ \ + _/ _// // / / / _ \ | |/ / ___/ ___/ + /_/ /____(_)_/\___/ |___/_/ /_/ + + vpp# clear interfaces + vpp# show int + Name Idx State Counter Count + TenGigabitEthernet86/0/0 1 up + TenGigabitEthernet86/0/1 2 down + local0 0 down + vpp# + +For more information on the interface commands refer to: :ref:`intcommands` + +The next step will be to create the virtual port using the :ref:`createvhostuser` command. +This command will create the virtual port in VPP and create a linux socket that the VM will +use to connect to VPP. + +The port can be created using VPP as the socket server or client. + +Creating the VPP port: + +.. code-block:: console + + vpp# create vhost socket /tmp/vm00.sock + VirtualEthernet0/0/0 + vpp# show int + Name Idx State Counter Count + TenGigabitEthernet86/0/0 1 up + TenGigabitEthernet86/0/1 2 down + VirtualEthernet0/0/0 3 down + local0 0 down + vpp# + +Notice the interface **VirtualEthernet0/0/0**. In this example we created the virtual interface as +a client. + +We can get more detail on the vhost connection with the :ref:`showvhost` command. + +.. code-block:: console + + vpp# show vhost + Virtio vhost-user interfaces + Global: + coalesce frames 32 time 1e-3 + number of rx virtqueues in interrupt mode: 0 + Interface: VirtualEthernet0/0/0 (ifindex 3) + virtio_net_hdr_sz 12 + features mask (0xffffffffffffffff): + features (0x58208000): + VIRTIO_NET_F_MRG_RXBUF (15) + VIRTIO_NET_F_GUEST_ANNOUNCE (21) + VIRTIO_F_ANY_LAYOUT (27) + VIRTIO_F_INDIRECT_DESC (28) + VHOST_USER_F_PROTOCOL_FEATURES (30) + protocol features (0x3) + VHOST_USER_PROTOCOL_F_MQ (0) + VHOST_USER_PROTOCOL_F_LOG_SHMFD (1) + + socket filename /tmp/vm00.sock type client errno "No such file or directory" + + rx placement: + tx placement: spin-lock + thread 0 on vring 0 + thread 1 on vring 0 + + Memory regions (total 0) + +Notice **No such file or directory** and **Memory regions (total 0)**. This is because the +VM has not been created yet. + |