c6698a3e8f
Some test applications and examples were not converted to the new offload API introduced in 17.11. For reference, see "Hardware Offload" in doc/guides/prog_guide/poll_mode_drv.rst Signed-off-by: Thomas Monjalon <thomas@monjalon.net> Acked-by: Ferruh Yigit <ferruh.yigit@intel.com>
267 lines
11 KiB
ReStructuredText
267 lines
11 KiB
ReStructuredText
.. SPDX-License-Identifier: BSD-3-Clause
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Copyright(c) 2010-2014 Intel Corporation.
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VMDQ and DCB Forwarding Sample Application
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==========================================
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The VMDQ and DCB Forwarding sample application is a simple example of packet processing using the DPDK.
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The application performs L2 forwarding using VMDQ and DCB to divide the incoming traffic into queues.
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The traffic splitting is performed in hardware by the VMDQ and DCB features of the Intel® 82599 and X710/XL710 Ethernet Controllers.
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Overview
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--------
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This sample application can be used as a starting point for developing a new application that is based on the DPDK and
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uses VMDQ and DCB for traffic partitioning.
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The VMDQ and DCB filters work on MAC and VLAN traffic to divide the traffic into input queues on the basis of the Destination MAC
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address, VLAN ID and VLAN user priority fields.
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VMDQ filters split the traffic into 16 or 32 groups based on the Destination MAC and VLAN ID.
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Then, DCB places each packet into one of queues within that group, based upon the VLAN user priority field.
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All traffic is read from a single incoming port (port 0) and output on port 1, without any processing being performed.
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With Intel® 82599 NIC, for example, the traffic is split into 128 queues on input, where each thread of the application reads from
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multiple queues. When run with 8 threads, that is, with the -c FF option, each thread receives and forwards packets from 16 queues.
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As supplied, the sample application configures the VMDQ feature to have 32 pools with 4 queues each as indicated in :numref:`figure_vmdq_dcb_example`.
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The Intel® 82599 10 Gigabit Ethernet Controller NIC also supports the splitting of traffic into 16 pools of 8 queues. While the
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Intel® X710 or XL710 Ethernet Controller NICs support many configurations of VMDQ pools of 4 or 8 queues each. For simplicity, only 16
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or 32 pools is supported in this sample. And queues numbers for each VMDQ pool can be changed by setting CONFIG_RTE_LIBRTE_I40E_QUEUE_NUM_PER_VM
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in config/common_* file.
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The nb-pools, nb-tcs and enable-rss parameters can be passed on the command line, after the EAL parameters:
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.. code-block:: console
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./build/vmdq_dcb [EAL options] -- -p PORTMASK --nb-pools NP --nb-tcs TC --enable-rss
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where, NP can be 16 or 32, TC can be 4 or 8, rss is disabled by default.
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.. _figure_vmdq_dcb_example:
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.. figure:: img/vmdq_dcb_example.*
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Packet Flow Through the VMDQ and DCB Sample Application
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In Linux* user space, the application can display statistics with the number of packets received on each queue.
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To have the application display the statistics, send a SIGHUP signal to the running application process.
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The VMDQ and DCB Forwarding sample application is in many ways simpler than the L2 Forwarding application
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(see :doc:`l2_forward_real_virtual`)
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as it performs unidirectional L2 forwarding of packets from one port to a second port.
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No command-line options are taken by this application apart from the standard EAL command-line options.
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.. note::
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Since VMD queues are being used for VMM, this application works correctly
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when VTd is disabled in the BIOS or Linux* kernel (intel_iommu=off).
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Compiling the Application
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-------------------------
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To compile the sample application see :doc:`compiling`.
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The application is located in the ``vmdq_dcb`` sub-directory.
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Running the Application
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-----------------------
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To run the example in a linuxapp environment:
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.. code-block:: console
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user@target:~$ ./build/vmdq_dcb -l 0-3 -n 4 -- -p 0x3 --nb-pools 32 --nb-tcs 4
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Refer to the *DPDK Getting Started Guide* for general information on running applications and
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the Environment Abstraction Layer (EAL) options.
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Explanation
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-----------
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The following sections provide some explanation of the code.
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Initialization
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~~~~~~~~~~~~~~
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The EAL, driver and PCI configuration is performed largely as in the L2 Forwarding sample application,
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as is the creation of the mbuf pool.
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See :doc:`l2_forward_real_virtual`.
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Where this example application differs is in the configuration of the NIC port for RX.
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The VMDQ and DCB hardware feature is configured at port initialization time by setting the appropriate values in the
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rte_eth_conf structure passed to the rte_eth_dev_configure() API.
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Initially in the application,
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a default structure is provided for VMDQ and DCB configuration to be filled in later by the application.
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.. code-block:: c
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/* empty vmdq+dcb configuration structure. Filled in programmatically */
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static const struct rte_eth_conf vmdq_dcb_conf_default = {
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.rxmode = {
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.mq_mode = ETH_MQ_RX_VMDQ_DCB,
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.split_hdr_size = 0,
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},
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.txmode = {
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.mq_mode = ETH_MQ_TX_VMDQ_DCB,
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},
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/*
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* should be overridden separately in code with
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* appropriate values
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*/
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.rx_adv_conf = {
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.vmdq_dcb_conf = {
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.nb_queue_pools = ETH_32_POOLS,
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.enable_default_pool = 0,
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.default_pool = 0,
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.nb_pool_maps = 0,
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.pool_map = {{0, 0},},
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.dcb_tc = {0},
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},
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.dcb_rx_conf = {
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.nb_tcs = ETH_4_TCS,
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/** Traffic class each UP mapped to. */
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.dcb_tc = {0},
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},
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.vmdq_rx_conf = {
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.nb_queue_pools = ETH_32_POOLS,
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.enable_default_pool = 0,
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.default_pool = 0,
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.nb_pool_maps = 0,
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.pool_map = {{0, 0},},
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},
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},
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.tx_adv_conf = {
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.vmdq_dcb_tx_conf = {
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.nb_queue_pools = ETH_32_POOLS,
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.dcb_tc = {0},
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},
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},
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};
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The get_eth_conf() function fills in an rte_eth_conf structure with the appropriate values,
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based on the global vlan_tags array,
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and dividing up the possible user priority values equally among the individual queues
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(also referred to as traffic classes) within each pool. With Intel® 82599 NIC,
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if the number of pools is 32, then the user priority fields are allocated 2 to a queue.
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If 16 pools are used, then each of the 8 user priority fields is allocated to its own queue within the pool.
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With Intel® X710/XL710 NICs, if number of tcs is 4, and number of queues in pool is 8,
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then the user priority fields are allocated 2 to one tc, and a tc has 2 queues mapping to it, then
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RSS will determine the destination queue in 2.
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For the VLAN IDs, each one can be allocated to possibly multiple pools of queues,
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so the pools parameter in the rte_eth_vmdq_dcb_conf structure is specified as a bitmask value.
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For destination MAC, each VMDQ pool will be assigned with a MAC address. In this sample, each VMDQ pool
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is assigned to the MAC like 52:54:00:12:<port_id>:<pool_id>, that is,
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the MAC of VMDQ pool 2 on port 1 is 52:54:00:12:01:02.
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.. code-block:: c
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const uint16_t vlan_tags[] = {
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0, 1, 2, 3, 4, 5, 6, 7,
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8, 9, 10, 11, 12, 13, 14, 15,
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16, 17, 18, 19, 20, 21, 22, 23,
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24, 25, 26, 27, 28, 29, 30, 31
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};
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/* pool mac addr template, pool mac addr is like: 52 54 00 12 port# pool# */
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static struct ether_addr pool_addr_template = {
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.addr_bytes = {0x52, 0x54, 0x00, 0x12, 0x00, 0x00}
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};
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/* Builds up the correct configuration for vmdq+dcb based on the vlan tags array
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* given above, and the number of traffic classes available for use. */
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static inline int
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get_eth_conf(struct rte_eth_conf *eth_conf)
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{
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struct rte_eth_vmdq_dcb_conf conf;
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struct rte_eth_vmdq_rx_conf vmdq_conf;
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struct rte_eth_dcb_rx_conf dcb_conf;
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struct rte_eth_vmdq_dcb_tx_conf tx_conf;
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uint8_t i;
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conf.nb_queue_pools = (enum rte_eth_nb_pools)num_pools;
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vmdq_conf.nb_queue_pools = (enum rte_eth_nb_pools)num_pools;
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tx_conf.nb_queue_pools = (enum rte_eth_nb_pools)num_pools;
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conf.nb_pool_maps = num_pools;
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vmdq_conf.nb_pool_maps = num_pools;
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conf.enable_default_pool = 0;
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vmdq_conf.enable_default_pool = 0;
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conf.default_pool = 0; /* set explicit value, even if not used */
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vmdq_conf.default_pool = 0;
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for (i = 0; i < conf.nb_pool_maps; i++) {
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conf.pool_map[i].vlan_id = vlan_tags[i];
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vmdq_conf.pool_map[i].vlan_id = vlan_tags[i];
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conf.pool_map[i].pools = 1UL << i ;
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vmdq_conf.pool_map[i].pools = 1UL << i;
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}
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for (i = 0; i < ETH_DCB_NUM_USER_PRIORITIES; i++){
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conf.dcb_tc[i] = i % num_tcs;
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dcb_conf.dcb_tc[i] = i % num_tcs;
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tx_conf.dcb_tc[i] = i % num_tcs;
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}
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dcb_conf.nb_tcs = (enum rte_eth_nb_tcs)num_tcs;
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(void)(rte_memcpy(eth_conf, &vmdq_dcb_conf_default, sizeof(*eth_conf)));
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(void)(rte_memcpy(ð_conf->rx_adv_conf.vmdq_dcb_conf, &conf,
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sizeof(conf)));
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(void)(rte_memcpy(ð_conf->rx_adv_conf.dcb_rx_conf, &dcb_conf,
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sizeof(dcb_conf)));
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(void)(rte_memcpy(ð_conf->rx_adv_conf.vmdq_rx_conf, &vmdq_conf,
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sizeof(vmdq_conf)));
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(void)(rte_memcpy(ð_conf->tx_adv_conf.vmdq_dcb_tx_conf, &tx_conf,
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sizeof(tx_conf)));
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if (rss_enable) {
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eth_conf->rxmode.mq_mode= ETH_MQ_RX_VMDQ_DCB_RSS;
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eth_conf->rx_adv_conf.rss_conf.rss_hf = ETH_RSS_IP |
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ETH_RSS_UDP |
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ETH_RSS_TCP |
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ETH_RSS_SCTP;
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}
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return 0;
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}
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......
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/* Set mac for each pool.*/
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for (q = 0; q < num_pools; q++) {
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struct ether_addr mac;
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mac = pool_addr_template;
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mac.addr_bytes[4] = port;
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mac.addr_bytes[5] = q;
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printf("Port %u vmdq pool %u set mac %02x:%02x:%02x:%02x:%02x:%02x\n",
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port, q,
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mac.addr_bytes[0], mac.addr_bytes[1],
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mac.addr_bytes[2], mac.addr_bytes[3],
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mac.addr_bytes[4], mac.addr_bytes[5]);
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retval = rte_eth_dev_mac_addr_add(port, &mac,
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q + vmdq_pool_base);
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if (retval) {
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printf("mac addr add failed at pool %d\n", q);
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return retval;
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}
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}
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Once the network port has been initialized using the correct VMDQ and DCB values,
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the initialization of the port's RX and TX hardware rings is performed similarly to that
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in the L2 Forwarding sample application.
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See :doc:`l2_forward_real_virtual` for more information.
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Statistics Display
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~~~~~~~~~~~~~~~~~~
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When run in a linuxapp environment,
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the VMDQ and DCB Forwarding sample application can display statistics showing the number of packets read from each RX queue.
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This is provided by way of a signal handler for the SIGHUP signal,
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which simply prints to standard output the packet counts in grid form.
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Each row of the output is a single pool with the columns being the queue number within that pool.
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To generate the statistics output, use the following command:
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.. code-block:: console
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user@host$ sudo killall -HUP vmdq_dcb_app
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Please note that the statistics output will appear on the terminal where the vmdq_dcb_app is running,
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rather than the terminal from which the HUP signal was sent.
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