--- /dev/null
+.. BSD LICENSE
+ Copyright(c) 2016 Canonical Limited. All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+
+ * Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in
+ the documentation and/or other materials provided with the
+ distribution.
+ * Neither the name of Intel Corporation nor the names of its
+ contributors may be used to endorse or promote products derived
+ from this software without specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+dpdk-devbind Application
+========================
+
+The ``dpdk-devbind`` tool is a Data Plane Development Kit (DPDK) utility
+that helps binding and unbinding devices from specific drivers.
+As well as checking their status in that regard.
+
+
+Running the Application
+-----------------------
+
+The tool has a number of command line options:
+
+.. code-block:: console
+
+ dpdk-devbind [options] DEVICE1 DEVICE2 ....
+
+OPTIONS
+-------
+
+* ``--help, --usage``
+
+ Display usage information and quit
+
+* ``-s, --status``
+
+ Print the current status of all known network interfaces.
+ For each device, it displays the PCI domain, bus, slot and function,
+ along with a text description of the device. Depending upon whether the
+ device is being used by a kernel driver, the ``igb_uio`` driver, or no
+ driver, other relevant information will be displayed:
+ - the Linux interface name e.g. ``if=eth0``
+ - the driver being used e.g. ``drv=igb_uio``
+ - any suitable drivers not currently using that device e.g. ``unused=igb_uio``
+ NOTE: if this flag is passed along with a bind/unbind option, the
+ status display will always occur after the other operations have taken
+ place.
+
+* ``-b driver, --bind=driver``
+
+ Select the driver to use or "none" to unbind the device
+
+* ``-u, --unbind``
+
+ Unbind a device (Equivalent to ``-b none``)
+
+* ``--force``
+
+ By default, devices which are used by Linux - as indicated by having
+ routes in the routing table - cannot be modified. Using the ``--force``
+ flag overrides this behavior, allowing active links to be forcibly
+ unbound.
+ WARNING: This can lead to loss of network connection and should be used
+ with caution.
+
+
+.. warning::
+
+ Due to the way VFIO works, there are certain limitations to which devices can be used with VFIO.
+ Mainly it comes down to how IOMMU groups work.
+ Any Virtual Function device can be used with VFIO on its own, but physical devices will require either all ports bound to VFIO,
+ or some of them bound to VFIO while others not being bound to anything at all.
+
+ If your device is behind a PCI-to-PCI bridge, the bridge will then be part of the IOMMU group in which your device is in.
+ Therefore, the bridge driver should also be unbound from the bridge PCI device for VFIO to work with devices behind the bridge.
+
+.. warning::
+
+ While any user can run the ``dpdk-devbind.py`` script to view the status of the network ports,
+ binding or unbinding network ports requires root privileges.
+
+
+Examples
+--------
+
+To display current device status::
+
+ dpdk-devbind --status
+
+To bind eth1 from the current driver and move to use igb_uio::
+
+ dpdk-devbind --bind=igb_uio eth1
+
+To unbind 0000:01:00.0 from using any driver::
+
+ dpdk-devbind -u 0000:01:00.0
+
+To bind 0000:02:00.0 and 0000:02:00.1 to the ixgbe kernel driver::
+
+ dpdk-devbind -b ixgbe 02:00.0 02:00.1
+
+To check status of all network ports, assign one to the igb_uio driver and check status again::
+
+ # Check the status of the available devices.
+ dpdk-devbind --status
+ Network devices using DPDK-compatible driver
+ ============================================
+ <none>
+
+ Network devices using kernel driver
+ ===================================
+ 0000:0a:00.0 '82599ES 10-Gigabit' if=eth2 drv=ixgbe unused=
+
+
+ # Bind the device to igb_uio.
+ sudo dpdk-devbind -b igb_uio 0000:0a:00.0
+
+
+ # Recheck the status of the devices.
+ dpdk-devbind --status
+ Network devices using DPDK-compatible driver
+ ============================================
+ 0000:0a:00.0 '82599ES 10-Gigabit' drv=igb_uio unused=
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