.. 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. I40E Poll Mode Driver ====================== The I40E PMD (librte_pmd_i40e) provides poll mode driver support for the Intel X710/XL710/X722 10/40 Gbps family of adapters. Features -------- Features of the I40E PMD are: - Multiple queues for TX and RX - Receiver Side Scaling (RSS) - MAC/VLAN filtering - Packet type information - Flow director - Cloud filter - Checksum offload - VLAN/QinQ stripping and inserting - TSO offload - Promiscuous mode - Multicast mode - Port hardware statistics - Jumbo frames - Link state information - Link flow control - Mirror on port, VLAN and VSI - Interrupt mode for RX - Scattered and gather for TX and RX - Vector Poll mode driver - DCB - VMDQ - SR-IOV VF - Hot plug - IEEE1588/802.1AS timestamping - VF Daemon (VFD) - EXPERIMENTAL Prerequisites ------------- - Identifying your adapter using `Intel Support `_ and get the latest NVM/FW images. - Follow the DPDK :ref:`Getting Started Guide for Linux ` to setup the basic DPDK environment. - To get better performance on Intel platforms, please follow the "How to get best performance with NICs on Intel platforms" section of the :ref:`Getting Started Guide for Linux `. Pre-Installation Configuration ------------------------------ Config File Options ~~~~~~~~~~~~~~~~~~~ The following options can be modified in the ``config`` file. Please note that enabling debugging options may affect system performance. - ``CONFIG_RTE_LIBRTE_I40E_PMD`` (default ``y``) Toggle compilation of the ``librte_pmd_i40e`` driver. - ``CONFIG_RTE_LIBRTE_I40E_DEBUG_*`` (default ``n``) Toggle display of generic debugging messages. - ``CONFIG_RTE_LIBRTE_I40E_RX_ALLOW_BULK_ALLOC`` (default ``y``) Toggle bulk allocation for RX. - ``CONFIG_RTE_LIBRTE_I40E_INC_VECTOR`` (default ``n``) Toggle the use of Vector PMD instead of normal RX/TX path. To enable vPMD for RX, bulk allocation for Rx must be allowed. - ``CONFIG_RTE_LIBRTE_I40E_16BYTE_RX_DESC`` (default ``n``) Toggle to use a 16-byte RX descriptor, by default the RX descriptor is 32 byte. - ``CONFIG_RTE_LIBRTE_I40E_QUEUE_NUM_PER_PF`` (default ``64``) Number of queues reserved for PF. - ``CONFIG_RTE_LIBRTE_I40E_QUEUE_NUM_PER_VF`` (default ``4``) Number of queues reserved for each SR-IOV VF. - ``CONFIG_RTE_LIBRTE_I40E_QUEUE_NUM_PER_VM`` (default ``4``) Number of queues reserved for each VMDQ Pool. - ``CONFIG_RTE_LIBRTE_I40E_ITR_INTERVAL`` (default ``-1``) Interrupt Throttling interval. Driver compilation and testing ------------------------------ Refer to the document :ref:`compiling and testing a PMD for a NIC ` for details. SR-IOV: Prerequisites and sample Application Notes -------------------------------------------------- #. Load the kernel module: .. code-block:: console modprobe i40e Check the output in dmesg: .. code-block:: console i40e 0000:83:00.1 ens802f0: renamed from eth0 #. Bring up the PF ports: .. code-block:: console ifconfig ens802f0 up #. Create VF device(s): Echo the number of VFs to be created into the ``sriov_numvfs`` sysfs entry of the parent PF. Example: .. code-block:: console echo 2 > /sys/devices/pci0000:00/0000:00:03.0/0000:81:00.0/sriov_numvfs #. Assign VF MAC address: Assign MAC address to the VF using iproute2 utility. The syntax is: .. code-block:: console ip link set vf mac Example: .. code-block:: console ip link set ens802f0 vf 0 mac a0:b0:c0:d0:e0:f0 #. Assign VF to VM, and bring up the VM. Please see the documentation for the *I40E/IXGBE/IGB Virtual Function Driver*. #. Running testpmd: Follow instructions available in the document :ref:`compiling and testing a PMD for a NIC ` to run testpmd. Example output: .. code-block:: console ... EAL: PCI device 0000:83:00.0 on NUMA socket 1 EAL: probe driver: 8086:1572 rte_i40e_pmd EAL: PCI memory mapped at 0x7f7f80000000 EAL: PCI memory mapped at 0x7f7f80800000 PMD: eth_i40e_dev_init(): FW 5.0 API 1.5 NVM 05.00.02 eetrack 8000208a Interactive-mode selected Configuring Port 0 (socket 0) ... PMD: i40e_dev_rx_queue_setup(): Rx Burst Bulk Alloc Preconditions are satisfied.Rx Burst Bulk Alloc function will be used on port=0, queue=0. ... Port 0: 68:05:CA:26:85:84 Checking link statuses... Port 0 Link Up - speed 10000 Mbps - full-duplex Done testpmd> Sample Application Notes ------------------------ Vlan filter ~~~~~~~~~~~ Vlan filter only works when Promiscuous mode is off. To start ``testpmd``, and add vlan 10 to port 0: .. code-block:: console ./app/testpmd -l 0-15 -n 4 -- -i --forward-mode=mac ... testpmd> set promisc 0 off testpmd> rx_vlan add 10 0 Flow Director ~~~~~~~~~~~~~ The Flow Director works in receive mode to identify specific flows or sets of flows and route them to specific queues. The Flow Director filters can match the different fields for different type of packet: flow type, specific input set per flow type and the flexible payload. The default input set of each flow type is:: ipv4-other : src_ip_address, dst_ip_address ipv4-frag : src_ip_address, dst_ip_address ipv4-tcp : src_ip_address, dst_ip_address, src_port, dst_port ipv4-udp : src_ip_address, dst_ip_address, src_port, dst_port ipv4-sctp : src_ip_address, dst_ip_address, src_port, dst_port, verification_tag ipv6-other : src_ip_address, dst_ip_address ipv6-frag : src_ip_address, dst_ip_address ipv6-tcp : src_ip_address, dst_ip_address, src_port, dst_port ipv6-udp : src_ip_address, dst_ip_address, src_port, dst_port ipv6-sctp : src_ip_address, dst_ip_address, src_port, dst_port, verification_tag l2_payload : ether_type The flex payload is selected from offset 0 to 15 of packet's payload by default, while it is masked out from matching. Start ``testpmd`` with ``--disable-rss`` and ``--pkt-filter-mode=perfect``: .. code-block:: console ./app/testpmd -l 0-15 -n 4 -- -i --disable-rss --pkt-filter-mode=perfect \ --rxq=8 --txq=8 --nb-cores=8 --nb-ports=1 Add a rule to direct ``ipv4-udp`` packet whose ``dst_ip=2.2.2.5, src_ip=2.2.2.3, src_port=32, dst_port=32`` to queue 1: .. code-block:: console testpmd> flow_director_filter 0 mode IP add flow ipv4-udp \ src 2.2.2.3 32 dst 2.2.2.5 32 vlan 0 flexbytes () \ fwd pf queue 1 fd_id 1 Check the flow director status: .. code-block:: console testpmd> show port fdir 0 ######################## FDIR infos for port 0 #################### MODE: PERFECT SUPPORTED FLOW TYPE: ipv4-frag ipv4-tcp ipv4-udp ipv4-sctp ipv4-other ipv6-frag ipv6-tcp ipv6-udp ipv6-sctp ipv6-other l2_payload FLEX PAYLOAD INFO: max_len: 16 payload_limit: 480 payload_unit: 2 payload_seg: 3 bitmask_unit: 2 bitmask_num: 2 MASK: vlan_tci: 0x0000, src_ipv4: 0x00000000, dst_ipv4: 0x00000000, src_port: 0x0000, dst_port: 0x0000 src_ipv6: 0x00000000,0x00000000,0x00000000,0x00000000, dst_ipv6: 0x00000000,0x00000000,0x00000000,0x00000000 FLEX PAYLOAD SRC OFFSET: L2_PAYLOAD: 0 1 2 3 4 5 6 ... L3_PAYLOAD: 0 1 2 3 4 5 6 ... L4_PAYLOAD: 0 1 2 3 4 5 6 ... FLEX MASK CFG: ipv4-udp: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ipv4-tcp: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ipv4-sctp: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ipv4-other: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ipv4-frag: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ipv6-udp: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ipv6-tcp: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ipv6-sctp: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ipv6-other: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ipv6-frag: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 l2_payload: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 guarant_count: 1 best_count: 0 guarant_space: 512 best_space: 7168 collision: 0 free: 0 maxhash: 0 maxlen: 0 add: 0 remove: 0 f_add: 0 f_remove: 0 Delete all flow director rules on a port: .. code-block:: console testpmd> flush_flow_director 0 Floating VEB ~~~~~~~~~~~~~ The Intel® Ethernet Controller X710 and XL710 Family support a feature called "Floating VEB". A Virtual Ethernet Bridge (VEB) is an IEEE Edge Virtual Bridging (EVB) term for functionality that allows local switching between virtual endpoints within a physical endpoint and also with an external bridge/network. A "Floating" VEB doesn't have an uplink connection to the outside world so all switching is done internally and remains within the host. As such, this feature provides security benefits. In addition, a Floating VEB overcomes a limitation of normal VEBs where they cannot forward packets when the physical link is down. Floating VEBs don't need to connect to the NIC port so they can still forward traffic from VF to VF even when the physical link is down. Therefore, with this feature enabled VFs can be limited to communicating with each other but not an outside network, and they can do so even when there is no physical uplink on the associated NIC port. To enable this feature, the user should pass a ``devargs`` parameter to the EAL, for example:: -w 84:00.0,enable_floating_veb=1 In this configuration the PMD will use the floating VEB feature for all the VFs created by this PF device. Alternatively, the user can specify which VFs need to connect to this floating VEB using the ``floating_veb_list`` argument:: -w 84:00.0,enable_floating_veb=1,floating_veb_list=1;3-4 In this example ``VF1``, ``VF3`` and ``VF4`` connect to the floating VEB, while other VFs connect to the normal VEB. The current implementation only supports one floating VEB and one regular VEB. VFs can connect to a floating VEB or a regular VEB according to the configuration passed on the EAL command line. The floating VEB functionality requires a NIC firmware version of 5.0 or greater. Limitations or Known issues --------------------------- MPLS packet classification on X710/XL710 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ For firmware versions prior to 5.0, MPLS packets are not recognized by the NIC. The L2 Payload flow type in flow director can be used to classify MPLS packet by using a command in testpmd like: testpmd> flow_director_filter 0 mode IP add flow l2_payload ether \ 0x8847 flexbytes () fwd pf queue fd_id With the NIC firmware version 5.0 or greater, some limited MPLS support is added: Native MPLS (MPLS in Ethernet) skip is implemented, while no new packet type, no classification or offload are possible. With this change, L2 Payload flow type in flow director cannot be used to classify MPLS packet as with previous firmware versions. Meanwhile, the Ethertype filter can be used to classify MPLS packet by using a command in testpmd like: testpmd> ethertype_filter 0 add mac_ignr 00:00:00:00:00:00 ethertype \ 0x8847 fwd queue 16 Byte Descriptor cannot be used on DPDK VF ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ If the Linux i40e kernel driver is used as host driver, while DPDK i40e PMD is used as the VF driver, DPDK cannot choose 16 byte receive descriptor. That is to say, user should keep ``CONFIG_RTE_LIBRTE_I40E_16BYTE_RX_DESC=n`` in config file. Link down with i40e kernel driver after DPDK application exit ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ After DPDK application quit, and the device is bound back to Linux i40e kernel driver, the link cannot be up after ``ifconfig up``. To work around this issue, ``ethtool -s autoneg on`` should be set first and then the link can be brought up through ``ifconfig up``. NOTE: requires Linux kernel i40e driver version >= 1.4.X Receive packets with Ethertype 0x88A8 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Due to the FW limitation, PF can receive packets with Ethertype 0x88A8 only when floating VEB is disabled. Incorrect Rx statistics when packet is oversize ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ When a packet is over maximum frame size, the packet is dropped. However the Rx statistics, when calling `rte_eth_stats_get` incorrectly shows it as received. VF & TC max bandwidth setting ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The per VF max bandwidth and per TC max bandwidth cannot be enabled in parallel. The dehavior is different when handling per VF and per TC max bandwidth setting. When enabling per VF max bandwidth, SW will check if per TC max bandwidth is enabled. If so, return failure. When enabling per TC max bandwidth, SW will check if per VF max bandwidth is enabled. If so, disable per VF max bandwidth and continue with per TC max bandwidth setting. TC TX scheduling mode setting ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ There're 2 TX scheduling modes for TCs, round robin and strict priority mode. If a TC is set to strict priority mode, it can consume unlimited bandwidth. It means if APP has set the max bandwidth for that TC, it comes to no effect. It's suggested to set the strict priority mode for a TC that is latency sensitive but no consuming much bandwidth.