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--- /dev/null
+.. BSD LICENSE
+ Copyright(c) 2016 Intel Corporation. All rights reserved.
+ 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.
+
+.. _virtio_user_as_excpetional_path:
+
+Virtio_user as Exceptional Path
+===============================
+
+The virtual device, virtio-user, was originally introduced with vhost-user
+backend, as a high performance solution for IPC (Inter-Process Communication)
+and user space container networking.
+
+Virtio_user with vhost-kernel backend is a solution for exceptional path,
+such as KNI which exchanges packets with kernel networking stack. This
+solution is very promising in:
+
+* Maintenance
+
+ All kernel modules needed by this solution, vhost and vhost-net (kernel),
+ are upstreamed and extensively used kernel module.
+
+* Features
+
+ vhost-net is born to be a networking solution, which has lots of networking
+ related featuers, like multi queue, tso, multi-seg mbuf, etc.
+
+* Performance
+
+ similar to KNI, this solution would use one or more kthreads to
+ send/receive packets from user space DPDK applications, which has little
+ impact on user space polling thread (except that it might enter into kernel
+ space to wake up those kthreads if necessary).
+
+The overview of an application using virtio-user as exceptional path is shown
+in :numref:`figure_virtio_user_as_exceptional_path`.
+
+.. _figure_virtio_user_as_exceptional_path:
+
+.. figure:: img/virtio_user_as_exceptional_path.*
+
+ Overview of a DPDK app using virtio-user as excpetional path
+
+
+Sample Usage
+------------
+
+As a prerequisite, the vhost/vhost-net kernel CONFIG should be chosen before
+compiling the kernel and those kernel modules should be inserted.
+
+#. Compile DPDK and bind a physical NIC to igb_uio/uio_pci_generic/vfio-pci.
+
+ This physical NIC is for communicating with outside.
+
+#. Run testpmd.
+
+ .. code-block:: console
+
+ $(testpmd) -c 0xc -n 4 \
+ --vdev=virtio_user0,path=/dev/vhost-net,queue_size=1024 \
+ -- -i --txqflags=0x0 --disable-hw-vlan --enable-lro --crc-strip
+ --enable-rx-cksum --rxd=1024 --txd=1024
+
+ This command runs testpmd with two ports, one physical NIC to communicate
+ with outside, and one virtio-user to communicate with kernel.
+
+* ``--enable-lro``
+
+ This is used to negotiate VIRTIO_NET_F_GUEST_TSO4 and
+ VIRTIO_NET_F_GUEST_TSO6 feature so that large packets from kernel can be
+ transmitted DPDK application and further TSOed by physical NIC.
+
+* ``--enable-rx-cksum``
+
+ This is used to negotiate VIRTIO_NET_F_GUEST_CSUM so that packets from
+ kernel can be deemed as valid Rx checksumed.
+
+* ``queue_size``
+
+ 256 by default. To avoid shortage of descriptors, we can increase it to 1024.
+
+* ``queues``
+
+ Number of multi-queues. Each qeueue will be served by a kthread. For example:
+
+ .. code-block:: console
+
+ $(testpmd) -c 0xc -n 4 \
+ --vdev=virtio_user0,path=/dev/vhost-net,queues=2,queue_size=1024 \
+ -- -i --txqflags=0x0 --disable-hw-vlan --enable-lro \
+ --crc-strip --enable-rx-cksum --txq=2 --rxq=2 --rxd=1024 \
+ --txd=1024
+
+#. Start testpmd:
+
+ .. code-block:: console
+
+ (testpmd) start
+
+#. Configure IP address and start tap:
+
+ .. code-block:: console
+
+ ifconfig tap0 1.1.1.1/24 up
+
+.. note::
+
+ The tap device will be named tap0, tap1, etc, by kernel.
+
+Then, all traffic from physical NIC can be forwarded into kernel stack, and all
+traffic on the tap0 can be sent out from physical NIC.
+
+Limitations
+-----------
+
+This solution is only available on Linux systems.
git.droids-corp.org / dpdk.git / commitdiff
