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diff --git a/doc/guides/tools/devbind.rst b/doc/guides/tools/devbind.rst new file mode 100644 index 00000000..cabd99dd --- /dev/null +++ b/doc/guides/tools/devbind.rst @@ -0,0 +1,143 @@ +.. 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= |