--- /dev/null
+.. SPDX-License-Identifier: BSD-3-Clause
+ Copyright(c) 2020 Intel Corporation.
+
+VMDq Forwarding Sample Application
+==========================================
+
+The VMDq Forwarding sample application is a simple example of packet processing using the DPDK.
+The application performs L2 forwarding using VMDq to divide the incoming traffic into queues.
+The traffic splitting is performed in hardware by the VMDq feature of the Intel® 82599 and X710/XL710 Ethernet Controllers.
+
+Overview
+--------
+
+This sample application can be used as a starting point for developing a new application that is based on the DPDK and
+uses VMDq for traffic partitioning.
+
+VMDq filters split the incoming packets up into different "pools" - each with its own set of RX queues - based upon
+the MAC address and VLAN ID within the VLAN tag of the packet.
+
+All traffic is read from a single incoming port and output on another port, without any processing being performed.
+With Intel® 82599 NIC, for example, the traffic is split into 128 queues on input, where each thread of the application reads from
+multiple queues. When run with 8 threads, that is, with the -c FF option, each thread receives and forwards packets from 16 queues.
+
+As supplied, the sample application configures the VMDq feature to have 32 pools with 4 queues each.
+The Intel® 82599 10 Gigabit Ethernet Controller NIC also supports the splitting of traffic into 16 pools of 2 queues.
+While the Intel® X710 or XL710 Ethernet Controller NICs support many configurations of VMDq pools of 4 or 8 queues each.
+And queues numbers for each VMDq pool can be changed by setting CONFIG_RTE_LIBRTE_I40E_QUEUE_NUM_PER_VM
+in config/common_* file.
+The nb-pools parameter can be passed on the command line, after the EAL parameters:
+
+.. code-block:: console
+
+ ./build/vmdq_app [EAL options] -- -p PORTMASK --nb-pools NP
+
+where, NP can be 8, 16 or 32.
+
+In Linux* user space, the application can display statistics with the number of packets received on each queue.
+To have the application display the statistics, send a SIGHUP signal to the running application process.
+
+The VMDq Forwarding sample application is in many ways simpler than the L2 Forwarding application
+(see :doc:`l2_forward_real_virtual`)
+as it performs unidirectional L2 forwarding of packets from one port to a second port.
+No command-line options are taken by this application apart from the standard EAL command-line options.
+
+Compiling the Application
+-------------------------
+
+To compile the sample application see :doc:`compiling`.
+
+The application is located in the ``vmdq`` sub-directory.
+
+Running the Application
+-----------------------
+
+To run the example in a Linux environment:
+
+.. code-block:: console
+
+ user@target:~$ ./build/vmdq_app -l 0-3 -n 4 -- -p 0x3 --nb-pools 16
+
+Refer to the *DPDK Getting Started Guide* for general information on running applications and
+the Environment Abstraction Layer (EAL) options.
+
+Explanation
+-----------
+
+The following sections provide some explanation of the code.
+
+Initialization
+~~~~~~~~~~~~~~
+
+The EAL, driver and PCI configuration is performed largely as in the L2 Forwarding sample application,
+as is the creation of the mbuf pool.
+See :doc:`l2_forward_real_virtual`.
+Where this example application differs is in the configuration of the NIC port for RX.
+
+The VMDq hardware feature is configured at port initialization time by setting the appropriate values in the
+rte_eth_conf structure passed to the rte_eth_dev_configure() API.
+Initially in the application,
+a default structure is provided for VMDq configuration to be filled in later by the application.
+
+.. code-block:: c
+
+ /* empty vmdq configuration structure. Filled in programmatically */
+ static const struct rte_eth_conf vmdq_conf_default = {
+ .rxmode = {
+ .mq_mode = ETH_MQ_RX_VMDQ_ONLY,
+ .split_hdr_size = 0,
+ },
+
+ .txmode = {
+ .mq_mode = ETH_MQ_TX_NONE,
+ },
+ .rx_adv_conf = {
+ /*
+ * should be overridden separately in code with
+ * appropriate values
+ */
+ .vmdq_rx_conf = {
+ .nb_queue_pools = ETH_8_POOLS,
+ .enable_default_pool = 0,
+ .default_pool = 0,
+ .nb_pool_maps = 0,
+ .pool_map = {{0, 0},},
+ },
+ },
+ };
+
+The get_eth_conf() function fills in an rte_eth_conf structure with the appropriate values,
+based on the global vlan_tags array.
+For the VLAN IDs, each one can be allocated to possibly multiple pools of queues.
+For destination MAC, each VMDq pool will be assigned with a MAC address. In this sample, each VMDq pool
+is assigned to the MAC like 52:54:00:12:<port_id>:<pool_id>, that is,
+the MAC of VMDq pool 2 on port 1 is 52:54:00:12:01:02.
+
+.. code-block:: c
+
+ const uint16_t vlan_tags[] = {
+ 0, 1, 2, 3, 4, 5, 6, 7,
+ 8, 9, 10, 11, 12, 13, 14, 15,
+ 16, 17, 18, 19, 20, 21, 22, 23,
+ 24, 25, 26, 27, 28, 29, 30, 31,
+ 32, 33, 34, 35, 36, 37, 38, 39,
+ 40, 41, 42, 43, 44, 45, 46, 47,
+ 48, 49, 50, 51, 52, 53, 54, 55,
+ 56, 57, 58, 59, 60, 61, 62, 63,
+ };
+
+ /* pool mac addr template, pool mac addr is like: 52 54 00 12 port# pool# */
+ static struct rte_ether_addr pool_addr_template = {
+ .addr_bytes = {0x52, 0x54, 0x00, 0x12, 0x00, 0x00}
+ };
+
+ /*
+ * Builds up the correct configuration for vmdq based on the vlan tags array
+ * given above, and determine the queue number and pool map number according to
+ * valid pool number
+ */
+ static inline int
+ get_eth_conf(struct rte_eth_conf *eth_conf, uint32_t num_pools)
+ {
+ struct rte_eth_vmdq_rx_conf conf;
+ unsigned i;
+
+ conf.nb_queue_pools = (enum rte_eth_nb_pools)num_pools;
+ conf.nb_pool_maps = num_pools;
+ conf.enable_default_pool = 0;
+ conf.default_pool = 0; /* set explicit value, even if not used */
+
+ for (i = 0; i < conf.nb_pool_maps; i++) {
+ conf.pool_map[i].vlan_id = vlan_tags[i];
+ conf.pool_map[i].pools = (1UL << (i % num_pools));
+ }
+
+ (void)(rte_memcpy(eth_conf, &vmdq_conf_default, sizeof(*eth_conf)));
+ (void)(rte_memcpy(ð_conf->rx_adv_conf.vmdq_rx_conf, &conf,
+ sizeof(eth_conf->rx_adv_conf.vmdq_rx_conf)));
+ return 0;
+ }
+
+ ......
+
+ /*
+ * Set mac for each pool.
+ * There is no default mac for the pools in i40.
+ * Removes this after i40e fixes this issue.
+ */
+ for (q = 0; q < num_pools; q++) {
+ struct rte_ether_addr mac;
+ mac = pool_addr_template;
+ mac.addr_bytes[4] = port;
+ mac.addr_bytes[5] = q;
+ printf("Port %u vmdq pool %u set mac %02x:%02x:%02x:%02x:%02x:%02x\n",
+ port, q,
+ mac.addr_bytes[0], mac.addr_bytes[1],
+ mac.addr_bytes[2], mac.addr_bytes[3],
+ mac.addr_bytes[4], mac.addr_bytes[5]);
+ retval = rte_eth_dev_mac_addr_add(port, &mac,
+ q + vmdq_pool_base);
+ if (retval) {
+ printf("mac addr add failed at pool %d\n", q);
+ return retval;
+ }
+ }
+
+Once the network port has been initialized using the correct VMDq values,
+the initialization of the port's RX and TX hardware rings is performed similarly to that
+in the L2 Forwarding sample application.
+See :doc:`l2_forward_real_virtual` for more information.
+
+Statistics Display
+~~~~~~~~~~~~~~~~~~
+
+When run in a Linux environment,
+the VMDq Forwarding sample application can display statistics showing the number of packets read from each RX queue.
+This is provided by way of a signal handler for the SIGHUP signal,
+which simply prints to standard output the packet counts in grid form.
+Each row of the output is a single pool with the columns being the queue number within that pool.
+
+To generate the statistics output, use the following command:
+
+.. code-block:: console
+
+ user@host$ sudo killall -HUP vmdq_app
+
+Please note that the statistics output will appear on the terminal where the vmdq_app is running,
+rather than the terminal from which the HUP signal was sent.
+
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