--- /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,
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+ 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.
+
+
+Flow Bifurcation How-to Guide
+=============================
+
+Flow Bifurcation is a mechanism which uses hardware capable Ethernet devices
+to split traffic between Linux user space and kernel space. Since it is a
+hardware assisted feature this approach can provide line rate processing
+capability. Other than :ref:`KNI <kni>`, the software is just required to
+enable device configuration, there is no need to take care of the packet
+movement during the traffic split. This can yield better performance with
+less CPU overhead.
+
+The Flow Bifurcation splits the incoming data traffic to user space
+applications (such as DPDK applications) and/or kernel space programs (such as
+the Linux kernel stack). It can direct some traffic, for example data plane
+traffic, to DPDK, while directing some other traffic, for example control
+plane traffic, to the traditional Linux networking stack.
+
+There are a number of technical options to achieve this. A typical example is
+to combine the technology of SR-IOV and packet classification filtering.
+
+SR-IOV is a PCI standard that allows the same physical adapter to be split as
+multiple virtual functions. Each virtual function (VF) has separated queues
+with physical functions (PF). The network adapter will direct traffic to a
+virtual function with a matching destination MAC address. In a sense, SR-IOV
+has the capability for queue division.
+
+Packet classification filtering is a hardware capability available on most
+network adapters. Filters can be configured to direct specific flows to a
+given receive queue by hardware. Different NICs may have different filter
+types to direct flows to a Virtual Function or a queue that belong to it.
+
+In this way the Linux networking stack can receive specific traffic through
+the kernel driver while a DPDK application can receive specific traffic
+bypassing the Linux kernel by using drivers like VFIO or the DPDK ``igb_uio``
+module.
+
+.. _figure_flow_bifurcation_overview:
+
+.. figure:: img/flow_bifurcation_overview.*
+
+ Flow Bifurcation Overview
+
+
+Using Flow Bifurcation on IXGBE in Linux
+----------------------------------------
+
+On Intel 82599 10 Gigabit Ethernet Controller series NICs Flow Bifurcation can
+be achieved by SR-IOV and Intel Flow Director technologies. Traffic can be
+directed to queues by the Flow Director capability, typically by matching
+5-tuple of UDP/TCP packets.
+
+The typical procedure to achieve this is as follows:
+
+#. Boot the system without iommu, or with ``iommu=pt``.
+
+#. Create Virtual Functions:
+
+ .. code-block:: console
+
+ echo 2 > /sys/bus/pci/devices/0000:01:00.0/sriov_numvfs
+
+#. Enable and set flow filters:
+
+ .. code-block:: console
+
+ ethtool -K eth1 ntuple on
+ ethtool -N eth1 flow-type udp4 src-ip 192.0.2.2 dst-ip 198.51.100.2 \
+ action $queue_index_in_VF0
+ ethtool -N eth1 flow-type udp4 src-ip 198.51.100.2 dst-ip 192.0.2.2 \
+ action $queue_index_in_VF1
+
+ Where:
+
+ * ``$queue_index_in_VFn``: Bits 39:32 of the variable defines VF id + 1; the lower 32 bits indicates the queue index of the VF. Thus:
+
+ * ``$queue_index_in_VF0`` = ``(0x1 & 0xFF) << 32 + [queue index]``.
+
+ * ``$queue_index_in_VF1`` = ``(0x2 & 0xFF) << 32 + [queue index]``.
+
+ .. _figure_ixgbe_bifu_queue_idx:
+
+ .. figure:: img/ixgbe_bifu_queue_idx.*
+
+#. Compile the DPDK application and insert ``igb_uio`` or probe the ``vfio-pci`` kernel modules as normal.
+
+#. Bind the virtual functions:
+
+ .. code-block:: console
+
+ modprobe vfio-pci
+ dpdk_nic_bind.py -b vfio-pci 01:10.0
+ dpdk_nic_bind.py -b vfio-pci 01:10.1
+
+#. Run a DPDK application on the VFs:
+
+ .. code-block:: console
+
+ testpmd -c 0xff -n 4 -- -i -w 01:10.0 -w 01:10.1 --forward-mode=mac
+
+In this example, traffic matching the rules will go through the VF by matching
+the filter rule. All other traffic, not matching the rules, will go through
+the default queue or scaling on queues in the PF. That is to say UDP packets
+with the specified IP source and destination addresses will go through the
+DPDK application. All other traffic, with different hosts or different
+protocols, will go through the Linux networking stack.
+
+.. note::
+
+ * The above steps work on the Linux kernel v4.2.
+
+ * The Flow Bifurcation is implemented in Linux kernel and ixgbe kernel driver using the following patches:
+
+ * `ethtool: Add helper routines to pass vf to rx_flow_spec <https://patchwork.ozlabs.org/patch/476511/>`_
+
+ * `ixgbe: Allow flow director to use entire queue space <https://patchwork.ozlabs.org/patch/476516/>`_
+
+ * The Ethtool version used in this example is 3.18.
+
+
+Using Flow Bifurcation on I40E in Linux
+---------------------------------------
+
+On Intel X710/XL710 series Ethernet Controllers Flow Bifurcation can be
+achieved by SR-IOV, Cloud Filter and L3 VEB switch. The traffic can be
+directed to queues by the Cloud Filter and L3 VEB switch's matching rule.
+
+* L3 VEB filters work for non-tunneled packets. It can direct a packet just by
+ the Destination IP address to a queue in a VF.
+
+* Cloud filters work for the following types of tunneled packets.
+
+ * Inner mac.
+
+ * Inner mac + VNI.
+
+ * Outer mac + Inner mac + VNI.
+
+ * Inner mac + Inner vlan + VNI.
+
+ * Inner mac + Inner vlan.
+
+The typical procedure to achieve this is as follows:
+
+#. Boot the system without iommu, or with ``iommu=pt``.
+
+#. Build and insert the ``i40e.ko`` module.
+
+#. Create Virtual Functions:
+
+ .. code-block:: console
+
+ echo 2 > /sys/bus/pci/devices/0000:01:00.0/sriov_numvfs
+
+#. Add udp port offload to the NIC if using cloud filter:
+
+ .. code-block:: console
+
+ ip li add vxlan0 type vxlan id 42 group 239.1.1.1 local 10.16.43.214 dev <name>
+ ifconfig vxlan0 up
+ ip -d li show vxlan0
+
+ .. note::
+
+ Output such as ``add vxlan port 8472, index 0 success`` should be
+ found in the system log.
+
+#. Examples of enabling and setting flow filters:
+
+ * L3 VEB filter, for a route whose destination IP is 192.168.50.108 to VF
+ 0's queue 2.
+
+ .. code-block:: console
+
+ ethtool -N <dev_name> flow-type ip4 dst-ip 192.168.50.108 \
+ user-def 0xffffffff00000000 action 2 loc 8
+
+ * Inner mac, for a route whose inner destination mac is 0:0:0:0:9:0 to
+ PF's queue 6.
+
+ .. code-block:: console
+
+ ethtool -N <dev_name> flow-type ether dst 00:00:00:00:00:00 \
+ m ff:ff:ff:ff:ff:ff src 00:00:00:00:09:00 m 00:00:00:00:00:00 \
+ user-def 0xffffffff00000003 action 6 loc 1
+
+ * Inner mac + VNI, for a route whose inner destination mac is 0:0:0:0:9:0
+ and VNI is 8 to PF's queue 4.
+
+ .. code-block:: console
+
+ ethtool -N <dev_name> flow-type ether dst 00:00:00:00:00:00 \
+ m ff:ff:ff:ff:ff:ff src 00:00:00:00:09:00 m 00:00:00:00:00:00 \
+ user-def 0x800000003 action 4 loc 4
+
+ * Outer mac + Inner mac + VNI, for a route whose outer mac is
+ 68:05:ca:24:03:8b, inner destination mac is c2:1a:e1:53:bc:57, and VNI
+ is 8 to PF's queue 2.
+
+ .. code-block:: console
+
+ ethtool -N <dev_name> flow-type ether dst 68:05:ca:24:03:8b \
+ m 00:00:00:00:00:00 src c2:1a:e1:53:bc:57 m 00:00:00:00:00:00 \
+ user-def 0x800000003 action 2 loc 2
+
+ * Inner mac + Inner vlan + VNI, for a route whose inner destination mac is
+ 00:00:00:00:20:00, inner vlan is 10, and VNI is 8 to VF 0's queue 1.
+
+ .. code-block:: console
+
+ ethtool -N <dev_name> flow-type ether dst 00:00:00:00:01:00 \
+ m ff:ff:ff:ff:ff:ff src 00:00:00:00:20:00 m 00:00:00:00:00:00 \
+ vlan 10 user-def 0x800000000 action 1 loc 5
+
+ * Inner mac + Inner vlan, for a route whose inner destination mac is
+ 00:00:00:00:20:00, and inner vlan is 10 to VF 0's queue 1.
+
+ .. code-block:: console
+
+ ethtool -N <dev_name> flow-type ether dst 00:00:00:00:01:00 \
+ m ff:ff:ff:ff:ff:ff src 00:00:00:00:20:00 m 00:00:00:00:00:00 \
+ vlan 10 user-def 0xffffffff00000000 action 1 loc 5
+
+ .. note::
+
+ * If the upper 32 bits of 'user-def' are ``0xffffffff``, then the
+ filter can be used for programming an L3 VEB filter, otherwise the
+ upper 32 bits of 'user-def' can carry the tenant ID/VNI if
+ specified/required.
+
+ * Cloud filters can be defined with inner mac, outer mac, inner ip,
+ inner vlan and VNI as part of the cloud tuple. It is always the
+ destination (not source) mac/ip that these filters use. For all
+ these examples dst and src mac address fields are overloaded dst ==
+ outer, src == inner.
+
+ * The filter will direct a packet matching the rule to a vf id
+ specified in the lower 32 bit of user-def to the queue specified by
+ 'action'.
+
+ * If the vf id specified by the lower 32 bit of user-def is greater
+ than or equal to ``max_vfs``, then the filter is for the PF queues.
+
+#. Compile the DPDK application and insert ``igb_uio`` or probe the ``vfio-pci``
+ kernel modules as normal.
+
+#. Bind the virtual function:
+
+ .. code-block:: console
+
+ modprobe vfio-pci
+ dpdk_nic_bind.py -b vfio-pci 01:10.0
+ dpdk_nic_bind.py -b vfio-pci 01:10.1
+
+#. run DPDK application on VFs:
+
+ .. code-block:: console
+
+ testpmd -c 0xff -n 4 -- -i -w 01:10.0 -w 01:10.1 --forward-mode=mac
+
+.. note::
+
+ * The above steps work on the i40e Linux kernel driver v1.5.16.
+
+ * The Ethtool version used in this example is 3.18. The mask ``ff`` means
+ 'not involved', while ``00`` or no mask means 'involved'.
+
+ * For more details of the configuration, refer to the
+ `cloud filter test plan <http://dpdk.org/browse/tools/dts/tree/test_plans/cloud_filter_test_plan.rst>`_
--- /dev/null
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lm_bond_virtio_sriov
lm_virtio_vhost_user
+ flow_bifurcation
git.droids-corp.org / dpdk.git / commitdiff
