doc: add guide to use virtio-user as exceptional path
Signed-off-by: Jianfeng Tan <jianfeng.tan@intel.com>
This commit is contained in:
Jianfeng Tan
Thomas Monjalon
parent
50665deebd
commit
0ba3870e75
386
doc/guides/howto/img/virtio_user_as_exceptional_path.svg
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386
doc/guides/howto/img/virtio_user_as_exceptional_path.svg
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</g>
|
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</svg>
|
||||
|
After Width: | Height: | Size: 23 KiB |
@ -40,3 +40,4 @@ HowTo Guides
|
||||
flow_bifurcation
|
||||
pvp_reference_benchmark
|
||||
virtio_user_for_container_networking
|
||||
virtio_user_as_exceptional_path
|
||||
|
||||
142
doc/guides/howto/virtio_user_as_exceptional_path.rst
Normal file
142
doc/guides/howto/virtio_user_as_exceptional_path.rst
Normal file
@ -0,0 +1,142 @@
|
||||
.. 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.
|
||||
Loading…
x
Reference in New Issue
Block a user